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Supplemental Information for the HPA Application Maplewood Creek Flooding and Habitat Improvement Projects May 1996 Prepared for City of Renton,Washington Prepared by Harza TABLE OF CONTENTS I. Overview of Proposed Projects.......................................................................I II. Project Operation and Supplemental Hydrologic Information..................2 III. Fisheries Information......................................................................................6 IV. Proposed Instream Construction Work........................................................8 Partial Removal of the Upstream Concrete Weir/Dam..........................................................8 Stabilization of Potentially Unstable Slopes..........................................................................9 Construction of the Bypass Pipe and Intake...........................................................................9 Excavation of the Existing Sedimentation Basin.................................................................10 Construction of the New Sedimentation Basin Embankment and Associated Structures....10 V. Timing of Construction.................................................................................10 VI. Proposed Fish Protection Measures During Construction........................II Figures 1. Project Construction Schedule Appendix 1. Environmental Review Committee, Determination of Non-Significance, Feb. 27, 1996 2. Shoreline Substantial Development Permit, March 15, 1996 I. Overview of Proposed Projects The City of Renton is proposing two projects along lower Maplewood Creek in Renton, Washington, to reduce sediment deposition in the creek channel below the existing sediment pond at River Mile (RM) 0.4 to 0.5, reduce the potential for flooding of public and private property, improve instream fish habitat conditions, and to provide an opportunity for upstream fish migration past the golf course and existing barriers to fish migration. These projects represent the last phase of approximately 3 years of planning efforts by the City, coordination with the Washington State Department of Fish and Wildlife, and construction of a fish ladder on the Cedar River by the Washington State Department of Transportation. Reconstruction of the existing sediment basin is being partially funded by a FEMA Hazard Mitigation Grant secured by the City. Both projects are located on the City of Renton's Maplewood Golf Course and include: 1. Reconstruction and improvement of two existing sediment ponds into one larger and more effective pond. 2. Construction of a new fish channel across the golf course, and diversion of the majority of flow in Maplewood Creek into the new channel. A third project to provide high flow capacity improvements to the existing Maplewood Creek channel is mentioned in the Project Description For Corps Permit Application. At this time, that project is not scheduled for design or construction, and should not be included in this review. We are requesting a separate HPA permit for each project, 1) the sediment basin reconstruction, and 2) the new fish channel construction and creek diversion. The sediment basin construction involves instream work and must be constructed first. Due to the estimated construction time needed, we would like the sediment basin HPA permit to allow construction through October 31. After construction, flow will continue to be directed to the existing Maplewood Creek channel until the new fish channel is ready. The new fish channel construction will occur on upland ground and does not require any instream work. After construction is completed, and the new channel is ready to receive flow, the majority of flow from Maplewood Creek will be diverted into the new fish channel. Construction of the new fish channel may be delayed until negotiations with a neighboring property owner are completed. A complete description of each project, as well as background information on Maplewood Creek, is provided in the attached document titled, "Project Description for Corps Maplewood Creek H:\\96-352A.doc Page 1 Permit Application". Additional background information regarding the projects is provided in the three enclosed documents which are referenced in the project description: • Maplewood Creek Sedimentation Basin Reconstruction and Improvements Project-Phase I Design Report • Maplewood Creek Fish Passage Channel Project-Riparian and Instream Habitat Report • Lower Maplewood Creek Flooding and Habitat Improvement Projects - Wetland Delineation Report This document, along with the attached "For Permit Only" sets of design drawings for both the "Sedimentation Basin Reconstruction and Improvements" and "Fish Channel Project" provide the most current information on proposed project operations, and detailed descriptions of proposed instream work necessary for development of these projects. The "For Permit Only" drawings supersede all other drawings included with any of the above-mentioned reports. II. Project Operation and Supplemental Hydrologic Information Project design for high flows was based on hydrology and flooding information taken from both the City of Renton Draft Maplewood Creek Basin Plan (Parametrix, 1989) and the Lower Cedar River Current and Future Conditions Report (King County, 1993). Hydrologic models were used for each of these reports to estimate expected peak discharges from the basin for various storm events. The results presented in these reports are summarized in Table 1 below: Table 1. Expected Maplewood Creek Peak Discharges Based on Modeling Results (cfs) Storm Event Recurrence Maplewood Creek Basin Plan Current and Future Conditions Interval (Yr) (HEC-1) Report (HSPF, 15 min. data) Current Future Current Future 2 118 173 59 132 10 202 275 104 207 25 251 333 135 257 100 300 392 197 349 (Source: Project Description for Corps Permit Application dated November 1995 by Harza Northwest,Inc.) The design for high flow conditions is described clearly in the other documents. This section provides additional information on monthly hydrology and proposed project operation during low flow periods. Table 2 provides a summary of the estimated mean daily flows, standard deviation about the mean, the 95% exceedence, and the 5% exceedence flows by month. Maplewood Creek H:\\96-352A.doc Page 2 The information in Table 2 was compiled from data provided by King County Surface Water Management Division, developed from 41 years of simulated flows using a calibrated HSPF model. The values reflect current conditions of land use as of approximately 1989. The 95% exceedence flow means that 95% of the time flows will exceed the stated value. Likewise, the 5% exceedence flow reflects flows in the creek that will be exceeded only 5% of the time. These flow values were selected as they represent the minimum and maximum respective creek flows commonly used in the State of Washington and other regions for design of fish passage and habitat facilities. As is typical for this type of stream in Western Washington, the annual low flow periods occur primarily in the months of July, August, September, and extend into October. Predicted minimum daily flows for the low flow period during an average water year range from 1.01 to 1.85 cfs, as shown in Table 2. In high runoff years, the minimum flow values vary from 1.47 to 4.21 cfs. Likewise, in low runoff years, low flows of 0.53 to 0.74 cfs can be expected. Maplewood Creek H:\\96-352A.doc Page 3 Table 2 - Monthly Flow Data for Maplewood Creek near confluence with Cedar River Flow Condition OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 95% Exceedence 0.53 0.75 1.31 1.65 1.62 1.67 1.72 1.02 0.89 0.74 0.62 0.61 Mean 1.85 4.10 5.80 6.69 5.99 4.75 3.10 1.87 1.49 1.10 1.01 1.15 Std. Dev. 1.01 1.99 2.34 2.77 2.66 2.18 1.03 0.48 0.39 0.19 0.33 0.48 5% Exceedence 4.21 13.70 17.23 19.40 15.60 13.10 8.50 3.76 2.50 1.48 1.47 2.81 Mean and exceedence values based on 41 years of simulated flows using calibrated HSPF model,reflects current conditions land use as of approximately 1989. (Source: King Co. Surface Water Mgmt Division,Fax from David Hartley to Eileen McLanahan at Harza,4/29/96). Maplewood Creek H:\\96-352A.doc Page 4 The outlet structures in the improved sediment basin will control the amount of flow released into the new fish channel and the existing creek channel. The intent of the design is to direct low flow into the new fish channel, and use the existing channel for peak storm flow. The outlet to the new fish channel is 1.5 feet lower than the main spillway. The system is designed to direct the majority of the first 17 cfs of flow in Maplewood Creek into the new fish channel. When the water level exceeds 1.5 feet, the majority of the additional flow will go over the main spillway and into the existing channel. A spillway rating table defining the design flows for each system is provided in Table 3. A small amount of flow (approx. 10 to 20 %) is being directed into the existing channel durirtg the low flow period to help satisfy the requirements of the adjacent property owner. The main spillway outlet structure will be fitted with a block out in the concrete section to allow placement of a specialized weir, valve, or orifice plate to control the low flow distribution. Should flows prove unsatisfactory over time, the special weir structure could be easily modified to accommodate observed conditions. ` During a majority of the time, there will be sufficient flow in the creek to maintain flow in both channels. However, during extremely dry years with low flows of approximately 0.5 cfs or less, there is a concern with the possibility of"drying up" the fish channel. Although the fish channel will be lined with clay to maintain surface water at low flows, there is a possibility that flow in the fish channel may go subterranean in the 12-inch gravel layer. The proposed flow split will route approximately 90% of the extreme low flow values to the new fish channel to maintain surface water for fish habitat, and to reduce the potential for stranding coho and other species during low flow events. Maplewood Creek H:\\96-352A.doc Page 5 Table 3 - Sedimentation Basin Design Outlet Flows Water Elevation in New Fish Limited Flow to Main Spillway Total Sediment Basin Channel Flow Existing Creek Flow Creek (ft) (cfs) (cfs) (cfs) Flow cfs) 111.17 0 0 0 0 111.42 0.5 0.1 0 0.6 111.67 2.0 0.3 0 2.3 112.17 7.7 0.8 0 8.5 112.67 17 1.5 0 18.5 113.17 29 2.4 65 96 113.67 42 3.3 185 230 114.17 45 4.3 347 396 The adjacent property owner has a Surface Water Right to use up to 0.03 cfs of water from the creek (approximately 13 gpm). A pipeline and inlet in the existing sediment pond will be reconstructed in the new sediment basin to allow the private property owner to satisfy the existing water right at all times. The 0.03 cfs withdrawal is not included in Table 3 since it is a negligible amount and may not occur year-round. III. Fisheries Information As described in the documents enclosed with this HPA application, current fish use of the existing Maplewood Creek channel below the sediment ponds is very low . No site specific data is available regarding fish use of Maplewood Creek; however, King County Surface Water Management staff did survey the creek for habitat quality in 1991 and 1992. The results of this survey is presented in the Cedar River Current and Future Conditions Report (King County 1993). The Current and Future Conditions Report also describes the expected situation with regard to fish use of Maplewood Creek. Long before the City purchased the golf course (1985), the lower section of Maplewood Creek was placed in the 72-inch culvert, and the creek was channelized (1940's - 1950's ?). Currently, Maplewood Creek is channelized to run in a straight course from the existing sediment ponds (RM 0.4) south through the Maplewood Golf Course to State Route 169. Before the widening of SR 169 in 1995, the creek crossed under the highway via a 165-foot long, 42-inch diameter steel culvert, then turned west and traveled through a 1,000-foot long, 72-inch diameter RCP culvert buried next to the railroad bed before reaching the Cedar River. During widening of the highway, the 42-inch diameter culvert was replaced with two 8-foot by 4-foot box culverts, Maplewood Creek H:\\96-352A.doc Page 6 but the creek still uses the 72-inch culvert to reach the Cedar River. This culvert system currently blocks Maplewood Creek to anadromous fish except during periods of high flow in the Cedar River. The existing sediment pond and the upper concrete dam at RM 0.4 - 0.5 block upstream and downstream fish passage. According to the Lower Cedar River Current and Future Conditions Report (King County, 1993), the lower portion of the ravine (RM 0.5 - 0.75) contains good habitat. Habitat in higher stream reaches (generally in the upper 0.2 miles of the ravine) is heavily affected by channel scour and lateral bank sliding. Most of the middle portion of the stream is under the control of the Maplewood Homeowners Association, which has worked to protect the area and its habitat. Despite the presence of the dam and the adverse conditions at the SR 169 culvert outfall, the Current and Future Conditions Report does identify Maplewood Creek as one of nine major fish-bearing tributaries along the Lower Mainstem Cedar River. According to the King County report, coho salmon (Oncorhyncus kisutch) may use Maplewood Creek as far as RM 0.4; and cutthroat trout (O. clarki), which have been isolated above the sediment ponds, thrive in the ravine above the dams up to about RM 1.0. Sockeye (O. nerka) and chinook salmon (O. tshawytscha), as well as steelhead (O. mykiss) and Dolly Varden (Salvelinus spp.) are known to be present in the Cedar River, and most likely were present in Maplewood Creek when it had better habitat, prior to construction of the railroad, state highway and 72-inch culvert. Other fish species which potentially could occur in Maplewood Creek up to RM 0.4 under current conditions include speckled dace (Rhinichyths osculus), three-spine stickleback (Gasterosteus aculeatus) and sculpin (Cottus spp.). The proposed projects will have several major positive benefits to fisheries resources. Construction of the new, improved sediment basin will reduce the amount of sediment being discharged into the lower section of Maplewood Creek, the 72-inch culvert, and the Cedar River. Notching the upper concrete dam will remove a blockage to fish passage into the upper section of the ravine, and will allow the creek to reestablish a natural course in that area. Construction of the new fish passage channel and connection to the newly-constructed WSDOT fish ladder will reestablish the opportunity for fish to migrate into Maplewood Creek and the upper section of the ravine. The new habitat features that will be installed on the golf course should enlarge the spawning and rearing habitat available for fish that migrate into the creek. Maplewood Creek H:\\96-352A.doc Page 7 IV. Proposed Instream Construction Work Project components that are considered instream work include: • Partial removal of the upper concrete dam, • Stabilization of potentially unstable slopes near the upper concrete dam, • Construction of the bypass pipe and intake to divert flow around the sedimentation basin during construction and future maintenance work, • Excavation of the existing sedimentation basin, and • Construction of the new sedimentation basin and all associated structures. Other components of the project that will not involve instream work include: • Improvements to the existing access road along the west side of the sedimentation basin, • Construction of a new fish ladder from the sediment basin to the new fish channel, and • Construction of the new fish channel and crossings on the golf course, and connection to the new fish ladder at the sediment basin and the existing WSDOT fish ladder at the Cedar River. Maplewood Creek will not be diverted into the new fish channel until all construction work on the channel and associated features is completed. Therefore, construction of the new fish channel, and connection to the existing WSDOT fish ladder and the new fish ladder at the sedimentation basin, are not considered instream work. Construction of the new fish channel will start at the south end, where the WSDOT fish ladder crosses under SR 169 and connects to the Cedar River. Any rainfall runoff in the channel will be allowed to drain out of the lower end and into the WSDOT fish ladder. Silt fencing will be used at the fish ladder entrance to prevent sediment from reaching the Cedar River. A general description of each of the above-listed project components is included in the "Project Description for Corps Permit Application" included with this HPA application. Additional discussions regarding the instream work are provided below. Reference should also be made to the design drawings included with this HPA application. Partial removal of the upper concrete dam, which is about 500 feet upstream of the existing sedimentation basin, will involve excavation of approximately 400 to 800 cubic yards of accumulated sediment from immediately upstream of the dam and demolition and removal of a Maplewood Creek H:\\96-352A.doc Page 8 portion of the concrete structure. The accumulated sediments, which are comprised mostly (90%) of sands and gravels, will be temporarily stockpiled on golf course property, away from the creek. Excavated material which cannot be reused for reconstruction of the basin will be used for golf course landscaping, or hauled to an approved off-site location for proper disposal. During removal of the sediment and concrete dam, the contractor will be required to divert the creek either through or around the work area. During September, when this work is scheduled to occur, mean flow in Maplewood Creek is only 1.15 cfs, so diversion of the creek in this work area should be easily accomplished by minor trenching, sand bags, or temporary piping past the construction area. Hay bales or silt fencing will be used to further minimize the amount of sediment entering the creek. The existing sedimentation basin will be left in service to collect any sediment or debris that enters the water. Stabilization of potentially unstable slopes near the weir/dam structure will involve removal of about 250 cubic yards of material along the toe of the slopes and the replacement of riprap. Again, during excavation and riprap placement along these slopes, hay bales or silt fencing will be used to minimize sediment from entering the creek. The existing sedimentation basin will remain in service to trap any sediment that might be carried downstream. Construction of the bypass pipe and inlet, which will be used to divert flows around the sedimentation basin during construction and also during future periodic maintenance work, will involve minor excavation along the creek bank to construct a small inlet and gate structure. It is anticipated that a small sandbag cofferdam will be required to isolate the work area from the creek flows. The inlet cofferdam will be removed following completion of the inlet construction. A 12-inch bypass pipe will be used for diversion and will extend along the west side of the basin from the new bypass inlet approximately 250 feet upstream of the new sedimentation basin embankment to a location on the existing creek channel about 100 feet downstream of the embankment. Sandbag cofferdams about 2 to 3 feet high across Maplewood Creek will be used to isolate the construction area between the bypass inlet and discharge point. Maplewood Creek will then be diverted through the bypass piping during excavation of the existing sedimentation basin, and construction of the new sedimentation basin and associated structures. Following completion of the new sedimentation basin the cofferdams and the temporary portion of the bypass piping that was installed beyond the fish ladder will be removed. The inlet and bypass piping up to the fish ladder will remain in place for use in diverting flows around the sedimentation basin during periodic maintenance work in the basin. Maplewood Creek H:\\96-352A.doc Page 9 Excavation of the existing sedimentation basin will be performed only after the Maplewood Creek flows have been diverted around the sedimentation basin construction area, so there will be no flow through the area being excavated. After flows are diverted through the above-described bypass pipe, it is possible (depending on the elevation of accumulated sediment) that some water will remain in the basin which will need to be pumped out or allowed to drain through a trench. A visual inspection of any remaining pools will be made prior to pumping or trenching, and any fish that are found will be removed with nets and transported to the upper creek. Between approximately 2,000 and 3,500 cubic yards of accumulated sediments in the existing basin will be removed and stockpiled away from the creek on golf course property, for possible use in the new sedimentation basin embankment. Construction of the new sedimentation basin embankment and associated structures will involve placement of the new embankment fill and PVC liner in the sedimentation basin area, construction of the reinforced concrete spillway and fishway outlet, piping to the new fish ladder, and the outlet pipe for diversion of the private landowner's water right. During construction of all of these features, the creek flow will be diverted around this area as described above. Following completion of all of the instream work components, flow in Maplewood Creek will be returned to the pre-construction channel. After completion of the new fish channel, and connection of the channel to the existing WSDOT fish ladder and the new fish ladder at the sedimentation basin, permanent diversion of the Maplewood Creek flows will be made to the new fish channel. V. Timing of Construction Construction of the new fish channel and the sedimentation basin are scheduled to occur between September 2 and October 31, 1996, outside of the busy golfing season of May through August. Both projects are scheduled to begin concurrently and proceed as shown on the attached construction schedule (Figure 1). Priority will be given to completing the sediment basin construction within the Fisheries construction window, and before the fall rainy season. The sedimentation basin work is scheduled to start with silt removal at the upper concrete dam, partial demolition of the dam, and slope stabilization repairs in that area. This work is expected to take approximately two weeks to complete. Installation of the bypass pipe is scheduled to follow the concrete dam work. Following installation of the bypass piping the creek will be diverted, and construction activities within the sedimentation basin will commence, including silt removal from existing basin, liner placement, embankment construction, spillway Maplewood Creek H:\\96-352A.doe Page 10 construction and fishway outlet construction. These activities are expected to require about five weeks to complete. The sedimentation basin construction should be complete by October 31, 1996, barring any significant weather or construction delays. The fish channel construction activities, which are not instream activities, are scheduled to be performed concurrently with the sedimentation basin work between September 2 and October 31, 1996. However, it is possible this work would not start until the sedimentation basin was near completion, and could continue into the Fall of 1996 or Spring of 1997. VI. Proposed Fish Protection Measures During Construction No significant adverse impacts to fish resources are anticipated due to construction. Instream construction work will be conducted during the low flow season in September and October, when the mean flow is 1.15 cfs. It is expected that no fish are in the existing channel below the sediment pond. As described in Section II, the existing sediment pond is blocked to upstream and downstream fish passage by the upper concrete dam. Nevertheless, during the dewatering of the pond, a visual inspection will be made, and any fish found will be removed with nets and transported to the upper creek. In addition, precautions will be taken to avoid the release of turbid water into the Cedar River. Hay bales or silt fencing will be used in the upper section of Maplewood Creek to minimize the amount of sediment that could enter the creek. A sandbag cofferdam about two to three feet high will be placed below the location where the construction bypass discharges into the existing creek to help catch sediment and filter the water. The new fish channel will not have any water from Maplewood Creek flowing into it during construction. Erosion and sedimentation prevention best management practices (BMP's) will be used to control the creation and movement of turbid rainfall runoff. The contractor will be required to remove any accumulated sediment resulting from rainfall runoff before Maplewood Creek flows are diverted to the new fish channel. No flows from Maplewood Creek will be diverted into the new fish channel until construction is completed and disturbed areas have been stabilized. H:DOCS\96-352a:DWC:ps Maplewood Creek H:\\96-352A.doc Page 11 FIGURE 1: Project Construction Schedule Maplewood Creek Sedimentation Basin and Fish Channel Project September October November December ID Task Name Duration start Finish 8/25 9/1 9/8 9/15 9/22 929 - 10/8 10113 1020 10/27 11/3 11/10 11/17 1124 1y1 1y8 j 1 Sedimentation Basin Improvements ' 47d j 826W: 1029196 i 2 Construction access roads 2d 8I2696. 827/96 3 Upper weir silt removal and demo 8d i 828/9�61 9/6+989/6+96 I 4 Creek slope stabilization 4d l 9/9!9/96 1�i 2/962/96 ::: 5 Upper weir diversion I 12d j 821V96 9/12/96 6 Bypass pipe/intake installation I 2d i 9/13/96' 9/16r96 7 Sedimentation basin diversion 25d 9/17/96: 1021/96 8 Sedimentation basin sift removal I Well 9/17/96 9/3d96 - - 9 Embankment construction I 10d l 10/1196• 1 0/14196 10 Spillway construction 5d 10/1196 10/7/96 11 Fishvray outiet(piping construction 5d j 1O/141961 10/t 8/96 12 Uner placement 3d I3d I 10121/96; 1023196 13 Basin piping installation 2d; 1024/96; 10/25/96 14 Reclamation j 2d! 10211*6 1029/96 16 Fish Channel Construction(Optional) 44d 8/26/96 10/24M 17 Fish Channel Construction 44d; 1O114/96, 12/12196 18 Fish ladder construction 20d I 10/14/96, 11/8/96 19 Clearing/grubbing/transplanting :::.::::.:•>;>:•::;t•>;;;•!•>:•:>::;�>::::•;: ! 3d! 10114l96� 70/16/96 20 Channel excavation 30d 10/16196 1126/96 _ _ ..,..., .. ...:...:x� 21 Crossing construction(8 req d) 27d 10✓21/96 1126/96 © ❑ ❑ 30 Utility crossing No.1 2d 1021/96_ 1022/96 31 U[iltry crossing No.2 2d' 11/1/96 11/4/96 32 Clay/gravel placement 30d 1021196: 1129/96 ....•.. ,_.. ... ::...::........:..:::..... . 33 Fish habitat structure installation 25d; 1023/96 11/26/96 ...:.........:... :....:. ...;:::....... .... .. 34 Vegetation planting 7d i 11/27/96 12J5/96 .___—_ 35 Reclamation 5d' 1216/96 12/12/96 Project Task Milestone Rolled Up Task Rolled Up Progress Date:5131196 Progress NO� Summary Rolled Up Milestone O Page 1 Appendix 1�/Id/`Jb 11:Z316 tI_ULUUY-I.tN I KHL h''KUUKHI'I5 16161 a STATE OF WASHINGTON DEPARTMENT OF ECOLOGY Marl Stop PV-71 • Olympra, Washington 98504-87 1 7 • (206) 459-6000 an March 15, 1996 Mr, Gregg Zimmerman city of Renton . Third Floor, Municipal Building Renton WA 98055 Dear Mr. Zimmerman: Thank you for the opportunity to comment on the determination of nonsignificance for the Maplewood Creek Flooding and Habitat Improvement Projects, located at 4050 Maple Valley Highway/ Maplewood Golf Course (LUA-96-009,5M,ECF) . we reviewed the environmental checklist and have the following comments. 1. To enhance performance of the proposed facility, efforts should be made to reduce assumed theoretical sediment loading. It would seem that efforts to biologically stabilize the toe of some of the slopes in the canyon would be cost effective, help reduce undercutting, etc. 2 . Additional efforts should be made with the up-gradient property owners, including King County, to reduce the rate of discharge to the system. Supplemental retention/detention may be possible. Given the commitment by the City to implement the project, prioritization by the County could provide cost savings on maintenance requirements and also provide a net benefit to System performance and water quality. If you have any questions, please call Mr. Ron Devitt with our Water Quality Program at (206) 649-7028. sincerely, Eli beth J. hinney Environmental Review EJP: 96-1241 cG: Ron Devitt, NWRO Janet Thompson, NWRO 3 , .b CITY OF RENTON Planning/Building/Public Works Department Jesse Tanner,Mayor Gregg Zimmerman P.E.,Administrator March 19, 1996 f l 1 State Department of Ecology 0 �` 6 Northwest Regional Office ng%j�, F 1 � 3190 160th Ave. SE /n�, `�/0' Bellevue, WA 98008-5452 dept 0 SUBJECT: Shoreline Management Substantial Development Permit for File No. LUA-96-009;SM Gentlemen: Enclosed is the Shoreline Substantial Development Permit for the above referenced project. The permit was issued by the City of Renton on March 15, 1996. We are filing this action with the Department of Ecology and the Attorney General per WAC 173-14-090. Please review this permit and attachments and call me at (277-5586) if you have any questions or need additional information. Sincerely, Mark R. Pywel , AICP Project Manager Enclosures: Copy of Original Application Affidavit of Public Notice/Publication Site Plan SEPA Determination cc: Office of Attorney General City of Renton, Transportation Systems City of Renton, Utility Systems City of Renton, Code Compliance Inspector Applicant SHRLTR.DOC 200 Mill Avenue South - Renton, Washington 98055 ®This paper contains 50%recycled material,25%post consumer CITY OF RENTON SHORELINE MANAGEMENT ACT OF 1971 PERMIT FOR SHORELINE MANAGEMENT SHORELINE SUBSTANTIAL DEVELOPMENT PERMIT APPLICATION NO.: LUA-96-009,ECF,SM DATE RECEIVED: January 30, 1966 DATE OF PUBLICATION: March 4, 1996 DATE APPROVED: February 27, 1996 DATE DENIED: N/A TYPE OF ACTION(S): [X] Substantial Development Permit [ ] Conditional Use Permit [ ] Variance Permit Pursuant to Chapter 90.58 RCW, the City of Renton has granted a permit: This action was taken on the following application: APPLICANT: City of Renton PROJECT: Maplewood Creek Flooding and Habitat Improvement Projects DEVELOPMENT DESCRIPTION: Phase 1 will construct a new low-flow fish passage channel across the golf course. The new channel will begin at the reconstructed sediment basin at the north side of the golf course (at the existing basin location), and will extend to the southwest corner of the golf course where it will be connected to an existing fish ladder(constructed by WSDOT) that goes under SR 169 to the Cedar River. The new channel will be about 1850 feet long, 12 to 26 feet wide, and 4 feet deep. The sides will be vegetated to provide shelter and fish habitat. All low flows in Maplewood Creek will be diverted to the new channel. The existing creek channel will be used to convey higher storm flows in Maplewood Creek. Phase 2 will reconstruct the existing sedimentation basin at the north side of the golf course (north of the old club house). The new basin will be about 160 feet long, 90 to 150 feet wide, and 6 1/2 feet deep. A system of concrete spillways will direct low flows to the new fish passage channel, and higher flows to the existing channel for Maplewood Creek. An old concrete dam, about 500 feet upstream of the existing basin, will be notched to allow the creek to reestablish a natural flow. Unstable and eroding side slopes next to the construction areas will be stabilized with riprap and replanted with vegetation. SHSUBDEV.DOC City of Renton P/B/PW Department Shoreline Substantial Development Permit Page 2 of 3 The sedimentation basin and new fish passage channel may be constructed from September 2 through October 31, 1996, provided that the Department of Fish and Wildlife will grant approval for construction outside the normal fisheries construction window (June 15 through Sept. 15). LEGAL DESCRIPTION: See Attached SEC-TWNP-R: Sec. 15, 16, 21, & 22, T23N, R5E WITHIN SHORELINES OF: Cedar River APPLICABLE MASTER PROGRAM: City of Renton The following section/page of the Master Program is applicable to the development: Section Description Page 5.04 Urban Environment page 22. 7.16 Stream Alteration page 36. Development of this project shall be undertaken pursuant to the following terms and conditions: 1. The applicant will maintain erosion control systems during the construction phase of this project. 2. The applicant will replace existing wetlands disturbed by this project in accordance with the City's Wetland Ordinance. 3. The applicant will submit a final wetland report with the construction drawings. This permit is granted pursuant to the Shoreline Management Action of 1971 and pursuant to the following: 1. The issuance of a license under the Shoreline Management Act of 1971 shall not release the applicant from compliance with federal, state, and other permit requirements. 2. This permit may be rescinded pursuant to Section 14(7) of the Shoreline Management Act of 1971 in the event the permittee fails to comply with any condition hereof. 3. A construction permit shall not be issued until thirty (30) days after approval by the City of Renton Development Services Division or until any review proceedings initiated within this thirty (30) day review period have been completed. Plah4ngfflbilding Ppllic Works Administrator Date SHSUBDEV.DOC City of Renton P/B/PW Department Shoreline Substantial Development Permit Page 3 of 3 THIS SECTION FOR DEPARTMENT USE ONLY IN REGARD TO A CONDITIONAL USE OR VARIANCE PERMIT DATE RECEIVED: APPROVED: DENIED: If Conditional Use, Section of the City's Shoreline Master Program authorizing the use: If Variance, Section(s) of the City's Shoreline Master Program being varied: This Conditional Use/Variance permit is approved/denied by the Department pursuant to Chapter 90.58 RCW. Development shall be undertaken pursuant to the following additional terms and conditions: Date Signature of Authorized Department Official cc: Attorney General's Office City of Renton, Plan Review(Neil Watts) City of Renton, Surface Water Utility(Ron Straka) Applicant SHSUBDEV.DOC t-I LC :..:�:.::::::.�::::::.�.::�:::.:iii:.iiiii:.ii:ii:v:�i'::::::::::::::.Jiii:iiiii:.:.:Li.ii::iL::::::iiiiii:ii.•..�.............................. .:::..:::.:.::. X. P G T� ::::: :: ::::::�111T`E R A P : .:: . 1: :: . .. :: OWNEr S ...::..:::.:.:._.:.......:.:.;. .. .::::: ::: ::::: .. .OJ. .C......� .FORN(........LQ.t ...�c. n.t :: .;:::::::.:::. Note if Thera is more than one Iagaf owner �teasa attach an additional. notarized:.ISltas2er_A{ip)icatron;:fafeach:flvVrrec.::,w;;...:.:::.:,v:::......::: EXISTING LAND USE(S): NAME: Municipal Golf Course CITY OF RENTON Wooded slopes PROPOSED LAND USES: ADDRESS: Municipal Building 200 Mill Avenue South Same as above CITY: ZIP: Renton WA 98055 EXISTING COMPREHENSIVE PLAN MAP DESIGNATION: TELEPHONE NUMBER: Rural Residential (206) 277-6193 PROPOSED COMPREHENSIVE PLAN MAP DESIGNATION: X. :`>'GONTA:GT PERSONtAPPL1ANT Same as above NAME: Daniel W. Carey EXISTING ZONING: Surface Water Utility P-1, Public Use ADDRESS: 200 Mill Avenue South PROPOSED ZONING: CITY: ZIP: Same as above Renton WA 98055 SITE AREA (SQ.FT. OR ACREAGE): TELEPHONE NUMBER: About 75,000 sf construction area (206) 277-6193 PROJECT VALUE: PROJECT.INFORMATION . PROJECT OR DEVELOPMENT NAME: Approx. $700,000 Maplewood Creek Flooding and Habitat IS THE SITE LOCATED IN THE AQUIFER PROTECTION AREA? Improvement Projects PROPERTY/PROJEEC16 ADDRESS(S)/LOCATION: APA Zone 2 Maplewood Golf Course IS THE SITE LOCATED IN ANY OTHER TYPE OF ENVIRONMENTALLY 4050 Maple Valley Highway SENSITIVE AREA? KING COUNTY ASSESSOR'S ACCOUNT NUMBER(S): Low quality wetland vegetation is present 1523059014 2123059023 along the edge of the creek and ponds. 1523059069 2223059010 1623059018 . .; ;. LEGAL DESCRIPTION .FT ROPERTY (/attach Sep rat sheet �f necessary ::::<:>:: ::::<><;:>:>:;:::::>::::>:::: .::. ...TYPE... P.APPL /1T(. &..F>= :::<<' >'>< :: : >..... :....................:.::.:..:.................... ..:............_........_..... .....Q.........__.. ..C........Q.N.............._...5..........._.......:........::::::::::::::::.:::::::....:............ .....::.:::.:::,:.:::::. :<: ::;::;.:: Chec .a..I(<.:a ((:catta.n::<x : .es:that..a t. :: Cl sfaf w,11 determine:fe.e ..: ..:. ::..:.: „PP.._:,,.. .. YA..,..,. pP Y. .. Y: :..::...:.:,...:::::..:..:::....:.:..:::.....,....., _ANNEXATION $ SUBDIVISION: _ COMP. PLAN AMENDMENT $ _ REZONE $ _ LOT LINE ADJUSTMENT $ _ SPECIAL PERMIT $ _ SHORT PLAT $ _TEMPORARY PERMIT $ _TENTATIVE PLAT $ _ CONDITIONAL USE PERMIT $ _ PRELIMINARY PLAT $ _ SITE PLAN APPROVAL $ _ FINAL PLAT $ _ GRADE & FILL PERMIT $ (NO. CU. YDS: ) PLANNED UNIT DEVELOPMENT: $ _ VARIANCE $ (FROM SECTION: ) _ PRELIMINARY _WAIVER $ _ FINAL _WETLAND PERMIT $ _ ROUTINE VEGETATION MOBILE HOME PARKS: $ MANAGEMENT PERMIT $ BINDING SITE PLAN $ SHORELINE REVIEWS: _ SUBSTANTIAL DEVELOPMENT $ _ CONDITIONAL USE $ _VARIANCE $ _ EXEMPTION $No Charge _ ENVIRONMENTAL REVIEW $ REVISION $ VIT` WNE H . .......... . :AFFIDA. O.FO RS IP.. :::::>>::........ <:::::::»<: .. .: ; '::::>=> I, (Print Name)Znv4-[.0 J 672A-ICA ,declare that I am(please check one)_the owner of the property involved in this application, the authorized representative to act for the property owner(please attach proof of authorization), and that the foregoing statements and answers herein contained and the information herewith submitted are in all respects true and correct to the best of my knowledge and belief. ATTEST: Subscribed and sworn to before me, a Notary Public,in and �c9f1A Lr� 5 � for the State of W(;Sh residing at (Name of Owner/Rgpresentative - SEA-mE ,on the day of ( gnature of ner/Repres ntative) (Signature of Notary Public) :.. .. .. _section_ . I ::: : ::>T t .be com e. >:eb . . _.. City File Number ECF SA I SHPL CU t_tA PP fP TP SP R�MP:''< J` .. AAQ...W :FP:UD SM ;SME ::MHP .:..BSP.: A ...CPA_ ..::. ..::>:: <;:>:::>:::<:>::>::::.::::.. 70TAt F ES 5 TOTAL POSTAGE PROVIDEQ S ........ . . ... _....,... _.�.. REVISED 2/95 PROJECT NARRATIVE MAPLEWOOD CREEK FLOODING AND HABITAT IMPROVEMENT PROJECTS The project is located on the Maplewood Golf Course at 4000 Maple Valley Highway (SR 169), and consists of two construction phases: Phase 1 will construct a new low-flow fish passage channel across the golf course. The new channel will begin at the existing sedimentation basin at the north side of the golf course and will extend to the southwest corner, where it will be connected to an existing fish ladder that goes under SR 169 to the Cedar River. The new channel will be about 1850 feet long, 12 to 26 feet wide, and 4 feet deep. The sides will be vegetated to provide shelter and fish habitat. All low flows in Maplewood Creek will be diverted to the new fish passage channel. The existing creek channel will be used to convey higher storm flows in Maplewood Creek that exceed the design capacity of the low flow channel. Phase 2 will reconstruct the existing sedimentation basin at the north side of the golf course. The new basin will be about 160 feet long, 90 to 150 feet wide, and 6 1/2 feet deep. The new sedimentation basin will be connected to the new fish passage channel and the existing channel for Maplewood Creek. An old concrete dam, about 500 feet upstream of the existing sediment basin, will be notched to allow the creek to reestablish a natural flow. Unstable and eroding side slopes next to the construction areas will be stabilized with riprap and vegetation. The project will be constructed on, or affect sections of, Maplewood Creek and unnamed areas of wetland vegetation along the banks of the creek and existing sediment ponds. In the ravine, the banks of the creek are mainly moderate to steep slopes. In some areas the slopes are vegetated with trees, bushes, and grass, and in other areas slope failure and erosion has occurred. On the golf course, the banks are low and flat, with areas of grass and small shrubs. The soil material along the creek is mainly sand and gravel till, with some silt. The lower end of the new fish passage channel will connect to the upper end of the existing WSDOT fish ladder, which is located on the south side of the golf course, north of the Maple Valley Highway. The upper end of the fish ladder is about 180 to 200 feet from the Cedar River shoreline. The project does not involve work any closer to the Cedar River or its bank. The estimated total construction cost of Phase 1 and 2 is $400,000 to $500,000. Phase 1 may be constructed from April 1 through May 1 , 1996, or through May 31 with consent of the Golf Course. If Phase 1 can not be constructed in April it may be constructed in the fall along with Phase 2. Phase 2 may be constructed from September 2 through October 31, 1996. H:DOCS:96-061b:DWC:ps Page 1 A Wetland Delineation Report is included with the checklist submitted as part of this application. A final wetland report in compliance with the City's Wetland Ordinance will be submitted with the construction plans. A preliminary landscape/vegetation plan has been submitted as part of the proposed project plan. A final landscape/vegetation plan will be prepared and included as part of the construction plans for the project. Existing utility lines associated with the Maplewood Booster Pump Station may need to be relocated or lowered as part of the new low flow fish passage channel. If this is necessary, best management practices would be followed to control erosion and new vegetation will be planted in the disturbed areas as soon as construction is completed. KDOCS:96-061 b:DWC:ps Page 2 ti CITY OF RENTON PLANNING/BUILDING/PUBLIC WORKS MEMORANDUM DATE: March 26, 1996 TO: Mark Pywell FROM: Daniel Carey (X-6193) SUBJECT: LUA-96-009, ECF,SM Maplewood Creek Flooding and Habitat Improvements Projects Response to Letters Recieved During SEPA Comment and Appeal Period Casey McCarty - Received March 15 1 have tried to summarize the issues raised in the March 8, 1996 letter from Casey McCarty and potential responses to them in the following: 1. Issue: The irrigation line that would be placed to continue the McCarty pond and lawn irrigation is not mentioned in the City files. What access will they have to the water once the fish channel is implemented? Response: The City will construct a new irrigation system inlet in the reconstructed sediment basin and connect it to the existing irrigation line to maintain irrigation water to the McCarty property. After the project is completed, the McCarty property will have the same access to irrigation water as it had before the project. Reconnecting the irrigation line is stated in the January 23, 1996 Environmental Checklist in Section 3. Water, a. Surface, 4) Surface Water Withdrawls or Diversions, and is shown on Plan Sheet 1, Maplewood Creek Sedimentation Basin Reconstruction And Improvement Project, which was submitted as part of the SEPA information. The irrigation line was not mentioned in the Staff Report to the Environmental Review Committee for the February 27, 1996 meeting. 2. Issue: What will happen to the property line on the west side of their property, described as the middle of the creek, once the project is completed and water is diverted to the new fish channel for the majority of the year? Response: The creek bed along the west side of the McCarty property is not being changed, and will be used for higher stormwater flows, so there is no change in the property line. 3. Issue: Property that has a year round creek running on it has a higher property value than property that has a part-time storm drain on it. How will my mother be compensated for this taking of property that is included in her title? Response: The City will discuss the issue with McCarty and attempt to reach a resolution. The issue does not involve environmental impacts to the creek and should not change the environmental determination. Mark Pyvwll Maplewood Creek Flooding/Habitat Improvements Project Page 2 4. Issue: In the tax lot listing of surrounding property owners only two of her three tax lots were included. The list should include account numbers: 102206-9084-06, 152305-9088-07, and 222305-9090-04. Response: The two McCarty tax lots that are within 300 feet of the project are correctly listed (1523059088 and 2223059090). Tax lot number 1022069084 is not within 300 feet of the project. 5. Issue: The gravel coming down the ravine does not cause a real problem until it gets about 1/3 of the way across the golf course, where it fills the creek bed and threatens the golf course with flooding. Put the proposed catch basin (new sediment basin) there, where the creek puts the gravel and where it is needed. Response: Gravel and debris will settle wherever the flow velocity is too slow to keep the material suspended in the water. If the new basin was constructed farther down on the golf course, gravel would be able to settle and fill the channel above it. The existing location is the best location to avoid future problems with sediment deposition on the golf course. Constructing the new sediment basin on the golf course is different from the plans approved for the FEMA Hazard Mitigation Grant, and could possibly invalidate the grant. Constructing the sediment basin on the golf course is not consistent with the golf course master plan and rearrangement of fairways and greens. 6. Issue: Putting the new sediment basin 1/3 of the way across the golf course will help it receive proper maintenance, rather than sporadic cleaning, as it will when it is out of sight just as the current one is and does. Response: The new sediment basin will be inspected each year, and accumulated sediment will be removed when the sediment storage volume is full. The City is responsible for the sediment basin and the golf course, and should maintain the sediment pond to avoid damage to the golf course . 7. Issue: We gave up on keeping fish in our pond because every two or three years something comes down the creek and kills all the fish. This has only been a problem since we started getting our water at the lower reservoir. We know these poisons probably don't occur above the upper dam because there are still trout there, and this area of the creek is isolated from the rest of the creek and the Cedar River by the two existing dams. Response: The majority of runoff from the drainage basin comes from the plateau above the Maplewood ravine and the upper concrete dam. A contaminant dumped in the water could come from the main part of the drainage basin, or any side stream coming into the creek. We hope that existing City and King County public education efforts and environmental awareness make it unlikely that contaminants are dumped in the creek. Public education is a major component of the Cedar River Basin Plan, which has been developed jointly between the City of Renton, King County, and other agencies and interested parties. 8. Issue: If the two dams were removed, and a gravel catchment were placed where the problem actually manifests itself, this whole situation could be handled in a much more natural manner. No dams, hence no significant spillways and no fish ladders. Response: See the response to no. 5 above. In order to use the new WSDOT fish ladder, a sediment pond and a set of concrete weirs would still be needed to divide flow between the fish ladder and the WSDOT 72 inch culvert. If the WSDOT fish ladder is not used, migrating salmon have to use the 900 foot long 72 inch diameter culvert to reach the golf course. In the past very few, if any, migrating salmon have come up the 72 inch culvert. Mark Pywell Maplewood Creek Flooding/Habitat Improvements Project Page 3 Washington Department of Fish and Wildlife - Received March 19 1. Statement: " As noted in the "MAPLEWOOD CREEK FISH PASSAGE CHANNEL Riparian and Instream Habitat Report", the construction and maintenance of the channel is a mitigation measure for the expansion and operation of the sediment basin." Response: The new fish channel is intended to be a replacement and mitigation measure for diverting the flow from the existing channel across the golf course. 2. Statement: ". . . the channel should not be considered a"fish passage channel"; rather, it is a reach of the creek which should be capable of providing substantial spawning and rearing habitat for salmon fish." Response: The City is designing the new channel to provide spawning and rearing habit on sections of the golf course, where it does not affect golf course usage and access to the upper ravine for spawning and rearing of migrating fish. 3. Statement: ". . . construction involving the sediment pond ( and adjacent and upstream work) should be scheduled to conclude prior to the commencement of fall rains. (October 1 is considered a safe target date.)". Response: The Surface Water Utility's consultant estimates that it may take eight weeks for the amount of work needed for upper dam removal and bank stabilization, sediment basin excavation, concrete work, and berm construction. Golf course events make it difficult for the Parks Department to allow construction to start before September 2. Therefore, the Surface Water Utility will request that the HPA allow construction through October 31. The Surface Water Utility will require the contractor to use management practices to reduce and control erosion and sediment, and make provisions to route the creek around work areas. If the HPA will not allow construction through October 31, the Surface Water Utility will have to reach an agreement with the Parks Department to allow construction to start before September 2. 4. Statement: "It will be necessary to add spawning gravels to the new channel . . ." Response: The channel design will include gravel suitable for spawning at its base. The annual inspection and maintenance program will include adding new gravel to the channel to replace any that is lost downstream. Muckleshoot Indian Tribe Fisheries Department- Received March 20 1. Statement: "The main purpose of the project is to reduce flooding and sedimentation at the golf course, not to restore or protect salmonid habitat, as emphasized by referring to the relocated stream as a fish passage channel. " Response: This is a multi-purpose project involving reconstructing the existing sediment basin and constructing a new channel across the golf course to connect with the new WSDOT fish ladder. The preliminary plans for the channel include specific feature only needed for fish habitat such as: - placing gravel along the bottom of the channel; - installing a clay or membrane liner under the channel to maintain base flows; and Mark Pywell Maplewood Creek Flooding/Habitat Improvements Project Page 4 - placing instream habitat features and vegetation in and along the channel. 2. Statement Summary: Peak flows in the upstream basin will increase with development, and will have an adverse impact on the stream channel and salmon living in the stream above the bypass. The proposed projects will mask the adverse impact from the golf course, and the City of Renton may perceive little need to undertake additional improvements above the golf course. Thus, the long term outcome of the proposal is a reduction in the habitat function of the stream. Response: The existing 900 foot long WSDOT culvert, sediment basin, and upper concrete dam are major barriers to fish migration to Maplewood Creek. The proposed project provides an alternate route past the 900 foot long culvert, a fish ladder past the new sediment basin, eliminates the upper dam from blocking fish migration, and provides about 1,000 linear feet of channel with habitat vegetation along its sides. In both the short and long term, the project increases the available habitat on the golf course and the potential for fish to reach habitat in the ravine. The increase in runoff as the basin develops is recognized in the Draft Proposed Lower Cedar River Basin and Nonpoint Pollution Action Plan (King County, February 1996). The City of Renton has been working co-operatively with King County, the Muckleshoot Tribe, and other agencies over the last five years to develop the Cedar River Basin and Nonpoint Pollution Action Plan. The basin plan is a comprehensive study of surface water management problems in the lower Cedar River basin, which includes the Maplewood Creek subbasin. The Cedar River Current and Future Conditions Report (April 1993) analyzed current and future peak flow conditions in the Maplewood Creek subbasin. The Basin Plan recommends measures to address current and future surface water management problems (flooding, water quality, fish habitat) due to existing and future development. The Basin Plan recommendations include capital improvement projects, changes in surface water management standards, and public education. This project is identified as a recommended capital improvement project to address an existing problem and help restore habitat (page 4-17, no. 3123). The majority of the basin and most of the ravine above the golf course is in King County. Additional projects upstream of Maplewood Golf Course are proposed in the Basin Plan to address the increase in peak flows due to development. 3. Statement: ". . . the Muckleshoot Fisheries Department requests that the WDFW not issue an HPA for this project until the cumulative impacts of stormwater peak discharge . . . upon salmonids within the Maplewood Creek Basin are analyzed and a report prepared." Response: The project does not affect the peak stormwater flow in Maplewood Creek. The basin has been analyzed in the Cedar River Current and Future Conditions Report (King County, April 1993). The recommendations in the Cedar River Basin Plan, along with the City of Renton and King County Stormwater Design Standards for new development, are intended to address the cumulative impacts of stormwater peak discharges. If the project is delayed, the FEMA Hazard Mitigation Grant Funding could be lost, and the City may not be able to construct both projects with the funds available. H:DOCS:96-200:DWC:ps .y CASEY A MCCARTY 10502 148TH AvE. S.E. RENTON, WA 98059-4205 VOICE (206) 228-3487 FAX(206) 235-3201 oF�` 5 199 c.0.1 � 6 FRIDAY, MARCH 8, 1996 MR. MARK PYWELL CITY OF RENTON DEPARTMENT OF PLANNING / BUILDING / PUBLIC WORKS RE: MAPLEWOOD CREEK FLOODING AND HABITAT IMPROVEMENTS PROJECTS LUA-096-009,ECF,SM DEAR MR. PYWELL, I'M WRITING TO YOU FOR MY MOTHER, BEULAH E MCCARTY,ABOUT THE IMPACT THAT THE ABOVE PROJECT WILL HAVE UPON HER PROPERTY WHICH IS LOCATED ON THE MAPLEWOOD CREEK DIRECTLY ACROSS FROM THE OLD CLUBHOUSE AT THE GOLF COURSE. I STOPPED BY YOUR OFFICE THIS LAST WEEK AT THE BEQUEST OF DAN CAREY TO SEE HOW THINGS WERE PROGRESSING. I READ MOST OF THE FILE AND WAS GIVEN A COPY OF THE STAFF REPORT FOR THE.ERC MEETING OF FEBRUARY 27, 1996. I DISCUSSED MY CONCERNS WITH DAN THIS LAST SUMMER AND FALL. I GUESS I JUST DIDN'T REALLY APPRECIATE THE SCOPE OF THE PROJECT UNTIL I REVIEWED THE OFFICE FILE AND READ THE STAFF REPORT. AND THEN TODAY AS I WAS WALKING UP THE CREEK TO WORK ON THE IRRIGATION SYSTEM I ACTUALLY SAW A PAIR OF TROUT SPAWNING ABOUT 50 FEET UPSTREAM FROM MY MOTHER'S PROPERTY. 1 WAS REMINDED OF WHAT AN IMPORTANT PART THE CREEK HAS PLAYED IN MY FAMILY'S LIFE THE FIFTY YEARS WE HAVE LIVED ON UP UNTIL ONLY ABOUT 30 YEARS AGO WE GOT OUR DRINKING WATER FROM "THE CREEK". WE THEN USED THE FARTHEST UPSTREAM DAM FOR THAT ACTIVITY AS WELL AS IRRIGATION. OUR FOE IN THOSE DAYS WAS NOT SO MUCH SAND AND GRAVEL AS IT IS NOW BUT RATHER LEAVES-TONS OF MAPLE LEAVES. I WAS REALLY THANKFUL WHEN WE GOT THE WELL SYSTEM INSTALLED AND THE CREEK WASN'T OUR LIFE LINE ANYMORE. HOW MUCH THINGS HAVE CHANGED OVER JUST THE PAST TWO DECADES. IT SEEMS THAT WE'RE NOW HAVING A 50 OR 100 YEAR HIGH WATER RUN OFF EVERY FEW YEARS RATHER THAN EVERY 50 OR 100 YEARS. WE'RE VERY CONCERNED THAT THE IRRIGATION LINE THAT DAN HAS TOLD ME O WOULD BE IN PLACE TO CONTINUE OUR POND AND LAWN IRRIGATION IS SIMPLY NOT MENTIONED ANYWHERE IN YOUR FILES. HAVE I MISSED IT? WHAT ACCESS WILL WE HAVE TO THE WATER ONCE THIS FISH CHANNEL IS IMPLEMENTED? WE ARE ALSO EXTREMELY CONCERNED ABOUT WHAT WILL HAPPEN TO THE O PROPERTY LINE THAT IS DESCRIBED AS THE MIDDLE OF THE CREEK WHEN THE CREEK BECOMES A STORM DRAIN AND IS NO LONGER. PROPERTY THAT HAS A O YEAR ROUND CREEK ON IT HAS A MUCH DIFFERENT AND HIGHER VALUE THAN PROPERTY THAT HAS A PART TIME STORM DRAIN ON IT. HOW WILL MY MOTHER BE COMPENSATED FOR THIS TAKING OF PROPERTY THAT IS INCLUDED IN HER TITLE? I ALSO NOTICED THAT IN THE TAX NUMBER LISTING OF SURROUNDING PROPERTY OWNERS THAT ONLY TWO OF HER THREE TAX LOTS WERE O INCLUDED. I DIDN'T UNDERSTAND THIS EITHER. THIS LIST SHOULD INCLUDE ACCOUNT NUMBERS 102206-9084-06, 152305-9088-07 AND 222305-9090-04. THE REAL PROBLEM THAT OCCURS IN THIS RAVINE IS A RESULT OF DUMPING ALL OF THE SURFACE WATER FROM THE DEVELOPMENTS ON TOP OF THE SURROUNDING HILLS AND BRINGING WITH IT HUNDREDS OF CUBIC YARDS OF PIT RUN STYLE GRAVEL WITH EACH EXTRA HEAVY RAIN. THIS GRAVEL DOES O NOT RESULT INTO ANY SORT OF REAL PROBLEM UNTIL IT GETS ABOUT A THIRD OF THE WAY ACROSS THE GOLF COURSE WHERE IT FILLS THE CREEK BED AND THREATENS THE COURSE WITH FLOODING AND THE ASSOCIATED GRAVEL. PUT THE CATCH BASIN THERE. THIS IS WHERE IT IS NEEDED. THIS IS WHERE THE CREEK TRIES TO PUT IT. AND THIS IS WHERE IT WILL RECEIVE PROPER MAINTENANCE RATHER THAN RECEIVING SPORADIC CLEANING AS IT WILL WHEN IT IS OUT OF SIGHT JUST AS THE CURRENT ONE 1S AND DOES. THE FISH CHANNEL IS A BEAUTIFUL IDEA. QUITE FRANKLY WE GAVE UP ON KEEPING FISH IN OUR POND BECAUSE EVERY TWO OR THREE YEARS O SOMETHING COMES DOWN THE CREEK AND KILLS ALL THE FISH. THIS HAS ONLY BEEN A PROBLEM SINCE WE STARTED GETTING OUR WATER AT THE LOWER RESERVOIR. ABOUT THE THIRD TIME WE LOST ALL OUR FISH WE JUST STOPPED REARING THEM. HOWEVER, WE KNOW THAT THEY CAN OCCASIONALLY SURVIVE BECAUSE THERE ARE SO MANY FINGERLINGS IN THE CREEK DURING THE SUMMER AND BECAUSE OF THE TWO ADULT TROUT I SAW SPAWNING TODAY. AND WE KNOW THESE POISONINGS PROBABLY-DON'T OCCUR ABOVE THE UPPER DAM BECAUSE THERE ARE STILL TROUT THERE AND THIS AREA OF THE CREEK IS COMPLETELY ISOLATED FROM THE REST OF THE CREEK AND CEDAR RIVER BY THE TWO EXISTING DAMS. IF THE TWO DAMS WERE REMOVED AND A GRAVEL CATCHMENT WERE PUT IN WHERE THE PROBLEM ACTUALLY MANIFESTS ITSELF THIS WHOLE SITUATION COULD BE HANDLED IN A MUCH MORE NATURAL MANNER. NO DAMS, HENCE NO SIGNIFICANT SPILLWAYS AND N_Q.FISH LADDERS. VERY SIMILAR TO THE WAY IT WAS AT THE TURN OF THE CENTURY AND THIS AREA WAS A DAIRY AND THIS MEANDERING CREEK HAD 16 INCH TROUT WITH SALMON AND STEELHEAD RUNS THAT FINALLY PETERED OUT IN THE 1950'S AS THE GRAVEL BEGAN TO FLOW. SINCERELY, CASEY CCARTY DEVELOPMENT PLANNING (,ITV nr7 r7NYr(�a6�TATF LL.yr MAR 1 91996 yam.. n fir` �y'� 19P9�nY RECEIVED State of Washington DEPARTMENT OF FISH AND WILDLIFE Mailing Address: 600 Capitol Way N, Olympia, WA 98501-1091 -(206)902-2200;TDD (206)902-2207 Main Office Location: Natural Resources Building, 1111 Washington Street SE, Olympia, WA March 15, 1996 Mark R. Pywell City of Renton- Department of Planning/":wilding/Public Works 200 Mill Avenue South Renton, Washington 98055 SUBJECT: Determination of Non-Significance - Maplewood Creek Flooding and Habitat Improvement Projects - LUA-96-009, Maplewood Creek, Tributary to Cedar River, King County, WRIA 08 . 0302 Dear Mr . Pywell : The Washington Department of Fish and Wildlife (WDFW) has reviewed the above-referenced document and submits the following comments . As noted in the "MAPLEWOOD CREEK FISH PASSAGE CHANNEL Riparian and Instream Habitat Report", the construction and maintenance of the channel is a mitigation measure for the expansion and O operation of the sedimentation basin. WDFW views the new channel as an opportunity to restore production of anadromous fish to Maplewood Creek and provide habitat in the reach through the golf course . Thus, the channel should not be considered a "fish passage channel"; rather, it is a reach of creek which should be capable of providing substantial spawning and rearing habitat for O salmonid fish . WDFW appreciates the efforts of the City in designing habitat features into the project and hopes to collaborate with the City of Renton to manage the channel in a manner which provides this habitat without impairing the operation of the golf course . As was discussed at the February 1, 19_96 meeting betwee:: "y' of lP_i:tGn and WDFW otaff , COi7S�ructior, invoIv n(y �i:c seddiment i Grid (and adiacent and upstream work ) shout be cleul:__ "_ to c:L !_ 1de prior to the commencement of fall rains . ( October 1 is O considered a safe target date . ) Construction of the r1ew Maplewood Creek channel could occur after the construction oL the sediment pond, with riparian plantings during the dormant season being given time to become established prior to sending flows down the new channel . = v` Mark R. Pywell Page 2 March 14, 1996 0 It will be necessary to add spawning gravels to the new channel to mitigate for the interception and removal of 'Large quantities of these size materials by the sedimentation basin . This and suitable design changes which should be added prior to submittal of the Hydraulic Project Application were discussed at the February 1 meeting. Thank you for the opportunity to comment . If you have questions or need additional information, please call me at ( 206 ) 392-9159 . We appreciate your cooperation in our efforts to protect, perpet- uate, and manage the fish resources of the state of Washington . Sincerely, Larry Fisher Area Habitat Biologist Habitat Management Program if cc : WDFW, Banyard WDFW, Heiner WDFW, Muller MIT Fisheries, Malcom ~ 03/20/96 09:16 FAX 206 931 0752 MUCKLESHOOT FISH -,-. RENTON-FINANCE Q 001 MUCKLESHOOT INDIAN TRIBE INDIA INNDD E TRIBE FISTS DEPARTMENT 19 March 1996 City of Renton Department of Planning/Building/Public Works Development Planning Section Municipal Building 200 Mill Avenue South Renton, Washington 98055 RE: MAPLEWOOD CREEK FLOODING AND HABITAT Il%1'ROVEMENT PROTECTS (L1LJA-96-QQ9 SM jECF) The Muckleshoot Environmental Division has reviewed the Determination of Non- Significance issued for the proposed Maplewood Creek Flooding and Habitat Improvement project. Though the intention to place habitat elements into the stream and relocate portions of the stream to connect it to an existing fish passage ladder is welcome, the Tribal Fisheries Department is concerned that the proposed action will indirectly lead to long term adverse impacts upon the stream as a whole, particularly in the reach above the proposed high flow bypass. The main purpose of the project is to reduce flooding and sedimentation at the golf 1 course, not to restore or protect salmonid habitat, as emphasized by referring to the relocated O stream as a fish passage channel. The project description indicates.that as the basin develops peak flows will increase dramatically, even at the smaller storm events. These increases will have adverse impacts upon the stream channel and upon salmon living in the stream above the bypass. However, the proposed projects will mask the adverse impacts at the golf course. Hence, the City of Renton may perceive little need to undertake the habitat and stormwater facility work required 20 to prevent further damage to the channel. above the golf course. Thus, the long term outcome of the proposal is a reduction in the habitat function of the stream. By copy of this letter, the Muckleshoot Fisheries Department requests that the WDFW not issue an HPA for this project until a:the cumulative impacts of stormwater peak discharge O and duration of velocities above a threshold upon salmonids within the Maplewood Creek basin are analyzed and a report prepared. Furthermore, as the sedimentation problems at the golf course are chronic and predictable, requests for permits can not be construed as emergency requests. Therefore, it is requested that no further HPAs be issued for dredging and related work at the golf course. If the WDFW elects to issue a permit for this project, the Muckleshoot Fisheries Department requests to be informed immediately. 39015 172nd Avenue S.E. •Auburn, Washington 98092 • (206) 931-0652 • FAX(206) 931-0752 ti 03/20/96 09:18 FAX 206 931 0752 MUCKLESHOOT FISH +++ RENTON-FINANCE U-)02 1 , The Tribal Environmental Division is willing to work with the City of Renton in the design of a cumulative impact analysis or in modifying the proposal to incorporate features that will partially compensate for probable stormwater impacts. I thank you for your attention to our concerns. If you have any questions regarding this letter call me at 931-0652. Sincerely, Roderick Malcom Habitat Biologist cc: WDFW /Larry Fisher .. -' T� '✓ -'Yv '•` s `'. .{, .. .. .._..... . ... e_ ..3_- as-. : .. �'. t - CASEY A MCCARTY 10502 148TH AvE. S.E. RENTON, WA 98059-4205 A14R VOICE (206) 228-3487 FAX (206) 235-3201 c��G~tii`.ry, U FRIDAY, MARCH 8, 1996 OF r A�NToiy N�^'G MR. MARK PYWELL CITY OF RENTON DEPARTMENT OF PLANNING l BUILDING l PUBLIC WORKS RE: MAPLEWOOD CREEK FLOODING AND HABITAT IMPROVEMENTS PROJECTS LUA-096-009,ECF,SM DEAR MR. PYWELL, I'M WRITING TO YOU FOR MY MOTHER, BEULAH E MCCARTY, ABOUT THE IMPACT THAT THE ABOVE PROJECT WILL HAVE UPON HER PROPERTY WHICH IS LOCATED ON THE MAPLEWOOD CREEK DIRECTLY ACROSS FROM THE OLD CLUBHOUSE AT THE GOLF COURSE. I STOPPED BY YOUR OFFICE THIS LAST WEEK AT THE BEQUEST OF DAN CAREY TO SEE HOW THINGS WERE PROGRESSING. I READ MOST OF THE FILE AND WAS GIVEN A COPY OF THE STAFF REPORT FOR THE ERC MEETING OF FEBRUARY 27, 1996. I DISCUSSED MY CONCERNS WITH DAN THIS LAST SUMMER AND FALL. I GUESS I JUST DIDN'T REALLY APPRECIATE THE SCOPE OF THE PROJECT UNTIL I REVIEWED THE OFFICE FILE AND READ THE STAFF REPORT. AND THEN TODAY AS I WAS WALKING UP THE CREEK TO WORK ON THE IRRIGATION SYSTEM I ACTUALLY SAW A PAIR OF TROUT SPAWNING ABOUT 50 FEET UPSTREAM FROM MY MOTHER'S PROPERTY. 1 WAS REMINDED OF WHAT AN IMPORTANT PART THE CREEK HAS PLAYED IN MY FAMILY'S LIFE THE FIFTY YEARS WE HAVE LIVED ON f. UP UNTIL ONLY ABOUT 30 YEARS AGO WE GOT OUR DRINKING WATER FROM "THE CREEK". WE THEN USED THE FARTHEST UPSTREAM DAM FOR THAT ACTIVITY AS WELL AS IRRIGATION. OUR FOE IN THOSE DAYS WAS NOT SO MUCH SAND AND GRAVEL AS IT IS NOW BUT RATHER LEAVES-TONS OF MAPLE LEAVES. I WAS REALLY THANKFUL WHEN WE GOT THE WELL SYSTEM INSTALLED AND THE CREEK WASN'T OUR LIFE LINE ANYMORE. HOW MUCH THINGS HAVE CHANGED OVER JUST THE PAST TWO DECADES. IT SEEMS THAT WE'RE NOW HAVING A 50 OR 100 YEAR HIGH WATER RUN OFF EVERY FEW YEARS RATHER THAN EVERY 50 OR 100 YEARS. WE'RE VERY CONCERNED THAT THE IRRIGATION LINE THAT DAN HAS TOLD ME WOULD BE IN PLACE TO CONTINUE OUR POND AND LAWN IRRIGATION IS SIMPLY NOT MENTIONED ANYWHERE IN YOUR FILES. HAVE I MISSED IT? WHAT ACCESS WILL WE HAVE TO THE WATER ONCE THIS FISH CHANNEL IS IMPLEMENTED? WE ARE ALSO EXTREMELY CONCERNED ABOUT WHAT WILL HAPPEN TO THE PROPERTY LINE THAT IS DESCRIBED AS THE MIDDLE OF THE CREEK WHEN THE CREEK BECOMES A STORM DRAIN AND IS NO LONGER. PROPERTY THAT HAS A YEAR ROUND CREEK ON IT HAS A MUCH DIFFERENT AND HIGHER VALUE THAN PROPERTY THAT HAS A PART TIME STORM DRAIN ON IT. HOW WILL MY MOTHER BE COMPENSATED FOR THIS TAKING OF PROPERTY THAT IS INCLUDED IN HER TITLE? I ALSO NOTICED THAT IN THE TAX NUMBER LISTING OF SURROUNDING PROPERTY OWNERS THAT ONLY TWO OF HER THREE TAX LOTS WERE INCLUDED. I DIDN'T UNDERSTAND THIS EITHER. THIS LIST SHOULD INCLUDE ACCOUNT NUMBERS 102206-9084,06, 152305-9088-07 AND 222305-9090-04. THE REAL PROBLEM THAT OCCURS IN THIS RAVINE IS A RESULT OF DUMPING ALL OF THE SURFACE WATER FROM THE DEVELOPMENTS ON TOP OF THE SURROUNDING HILLS AND BRINGING WITH IT HUNDREDS OF CUBIC YARDS OF PIT RUN STYLE GRAVEL WITH EACH EXTRA HEAVY RAIN. THIS GRAVEL DOES NOT RESULT INTO ANY SORT OF REAL PROBLEM UNTIL IT GETS ABOUT A THIRD OF THE WAY ACROSS THE GOLF COURSE WHERE IT FILLS THE CREEK BED AND THREATENS THE COURSE WITH FLOODING AND THE ASSOCIATED GRAVEL. PUT THE CATCH BASIN THERE. THIS IS WHERE IT IS NEEDED. THIS IS WHERE THE CREEK TRIES TO PUT IT. AND THIS IS WHERE IT WILL RECEIVE PROPER MAINTENANCE RATHER THAN RECEIVING SPORADIC CLEANING AS IT WILL WHEN IT IS OUT OF SIGHT JUST AS THE CURRENT ONE IS AND DOES. THE FISH CHANNEL IS A BEAUTIFUL IDEA. QUITE FRANKLY WE GAVE UP ON KEEPING FISH IN OUR POND BECAUSE EVERY TWO OR THREE YEARS SOMETHING COMES DOWN THE CREEK AND KILLS ALL THE FISH. THIS HAS ONLY BEEN A PROBLEM SINCE WE STARTED GETTING OUR WATER AT THE LOWER RESERVOIR. ABOUT THE THIRD TIME WE LOST ALL OUR FISH WE JUST STOPPED REARING THEM. HOWEVER, WE KNOW THAT THEY CAN OCCASIONALLY SURVIVE BECAUSE THERE ARE SO MANY FINGERLINGS IN THE CREEK DURING THE SUMMER AND BECAUSE OF THE TWO ADULT TROUT I SAW SPAWNING TODAY. AND WE KNOW THESE POISONINGS PROBABLY DON'T OCCUR ABOVE THE UPPER DAM BECAUSE THERE ARE STILL TROUT THERE AND THIS AREA OF THE CREEK IS COMPLETELY ISOLATED FROM THE REST OF THE CREEK AND CEDAR RIVER BY THE TWO EXISTING DAMS. IF THE TWO DAMS WERE REMOVED AND A GRAVEL CATCHMENT WERE PUT IN WHERE THE PROBLEM ACTUALLY MANIFESTS ITSELF THIS WHOLE SITUATION COULD BE HANDLED 1N A MUCH MORE NATURAL MANNER. NO DAMS, HENCE NO SIGNIFICANT SPILLWAYS AND NO FISH LADDERS. VERY SIMILAR TO THE WAY IT WAS AT THE TURN OF THE CENTURY AND THIS AREA WAS A DAIRY AND THIS MEANDERING CREEK HAD 16 INCH TROUT WITH SALMON AND STEELHEAD RUNS THAT FINALLY PETERED OUT IN THE 1950'S AS THE GRAVEL BEGAN TO FLOW. SINCERELY, CASEY CCARTY FEB 05 '90 17:20 FR CHICAGO TITLE/CS 206 602 6903 TO 4252352541 P. 12i24 w, Y, 1•:.air µ, ''r rye,),f;; f K,t( • t �^ t'14'"ri�P'1� 1• `r .vi. , . t , 44y�3121 + mot Atli a�v iaca"AL(,tax'by rasR r..,.�ttl'8r, �S' 'Yrt ��� :., . •.� „� u t ':: For aee is consieeritiofi o! tJ1s alas ef.olr ls! 1i DOsr rsosfrs'.i1a•leof islrMD�aasaoela0ire• as �'*, t7t1OAn a O1Ryerttfell, lu•sooeusel!s Otte �` ewssat U lrt'eDt �atlted ce TIa,P.ClF2C'.TFSiAk� T. v assfplo. elte trr riot, oriviless �lfe:aut8alV t:0 ooeitrue� t •etsderlgc� apar�ta.:ifleDeet�:slavia.ar n ■oea liesg or esliplur r+/fe esl•tII+Pa. or'aLbrr stD�al'er e1>•LiQie.elae eiret. ta,•1lmalatielF of aarb ema,ste.r— atnma eoefeaits, eaDiaa, aalupUs aM-erbr ts nsetA+rarttt aoDttraeaeoes u't2e Graata�iV.�Toa cfa J co tts�lreQulr•, oDan: atroas, or•r as1!!er}sa•t tea tolloriat'diasrfob ProCe[q"aM tLti,rotGs. sttsets cc a J r; sle�,V• tL•tece ae�e:ntns. alcuatse In the td•vt.7•of nun, etate or wissiast.eni V � That portion of Goverment.la,L.1,`.Seetioa,?1j,Tornehip, 73:8orth, i•� � iiange 5 Usti Ydl.,:k northerly of:Primary-State HighwILY No. � � O- 5, and easterly of.Xapleirood Galt'Club•'!tltrancsi,losd�',atsdahat' 4!1 � � �- portion of tits Nortawst'Qsarter',ot the,Mcrthtreat•,Qt�artaT of section 22,:townOdp.23 go�+s,,�+8: 51 zast .lr•ri. °i1T�d to- O the East of the Ma�.Lawood Golf C1nD entranse:road sitd Kt;rth of C Primery State Highway'Ilo.5. a`. All as laid out sad detailed on R:0.:4.2060 KC dated. d February 23, 246i. In the event of a chwiga .11a. the basic use....Dr,the propvi;ty.: I by the Grarito;�tYsuccessors or assigns,',the;location of': $ this easeeneltt may De'cb nged by the Grantor#" its succe33ors _< or ssaigns. ri itself its . ROcceaaora and aaalS0 OereDy cor•ean[e - Tn. nranter for XJCZDM Cnwi n0 {IJQInp. =I11 re• n• 'Ion. or Derm:ttel •1th1h five { re*?. Or.Rafe Imes -Mich sill Sn mysenn•r disturb tnetr :1RRrth any Dorcion tt.ereor; and that no elaatinq or el se fili'Be of ah7 eiDloalla •iil De Der- soimitY or 1 i; mttt•a .1CRin C!CC•an G�) feet OC +ale•11rtes• ,"u I aoacul, er caste la Se'Weer thla'�ant alall b De !aS4 4DOn e ro>ae AS uo• :Nnica, aRn shall De bw 1•O..to Ruch depth as not LO Int.Here ■ttll•the oe01Rar7 vas Of�81,1d i i+nl. T`. Grwnc.• sa+i: at all t),r` Rire tR• riot of fre. SnSesa Lo aM •yr-se [rea sale oropertY for all pu"ta ., h•rr Sn trnCtt�°�• 1 ��_naY of March Io W17 .S'rn L�Ay:4', t;t• unrvralanro M! nett uleV Lnie LhSLrutnent Lhia mAPLI\OD GCLF CCUHTRT-. T-L% "C• y n, KING qn tl,l:'•_�Zd'1+7 of_ 1{aTeh —. S.U. 17 b.L-, ac,'ore M p•re0nal!) ►DDearea RON ❑nn 1 w 1 innArt r t. td me tnoaill t0 0• Ch.. ....P.r_o.a.idans__o.ad_5.acr trY wr t.nr r,,,r par'at inn tnr,t •„•r,�,c•� cM •lthlh •nn rorokOI p th-Arurent r.M ac Rho•1•d.ieA the ahm In•trvo. to Z. thr frr•• nti• vnl,p,f.o-ry u,G nnl C—a or vwl0 •.nrpMatl on, fm' Lhn ,ih.� anA Dpf Doaea LMre In n•ntionea, �,. VA 1 ,.Tut r.. .v. nrrRnr Vrt to vr•rut. �w IA nat.rw►nt mm t'at CM "Al %U11,11 l•'lhe tor00nte •sal or rta sa,y !urYnratinn. fN YIT►v.nn vlo:udgr, t Nrr• n•rrenl0 ere nY hang an" afiltM neat th. 'ilkand rr►r In tnta c•rtltieatw. rlrnL augv. •rlr,tr t•., _ r \ I / M..ry I'r•Dlla In aM Ce• th• 'lease of wastllington FEB 05 '98 17: 19 FP. CHICPGO TITLE/CS 206 682 6903 TO 4252352541 P.03/24 gurit Un art t c4t 'be SID M*4. tteaiautdA pt.)L30 'Inc, tea RrA:,, id ,OR w: h • o "'U4 IM45 A'y"S re VAL " . ;*p. , -t !A a As AI to the ASS AL P�*df AL Aw- I. _9;80 ta -to ark unqd A�Gifla a. to *tows abi, ra'. w Pr V Ruf-ii AM Sa --al ALMA. tbo'. landy SAI, • t on -b the Zed` Zv cant A7. Or a WOOart' the 77, Aux n 41 W,w TT l 10 ,;mftia #S�f zud��f'jb Litt 1 Exhibit A, page 1 of 4 n`li�lYtU frill U 31 [�(,� r h Marren & Kellogg , . � FEB � � - :•v:Cl�t� O At at Law FCT1C��� Renton , WA 98057 �hr STATUTORY WARRANTY DEED C c MAPLEWOOD GOLF AND COUNTRY CLUB , a Washington corporation , for and in consideration of Ten Dollars ( $ 10 .00) and other wood and valuable consideration in hard paid , convey( s ) and warrant( s) to THE CITY Or RENTON , a Washington municipal corporation , the following described real estate , situated in King County, State of Washington : PARCEL A: The southwest quarter of the southwest quarter of the ^. + Section 1 Township 23 North Range A southwest qua.n ter o� ec�-o., � , 5 east , W. M . , in King County , rashington . Except that portion lying within the follcwinz tescribed Commencing at the northwest corner of Sect-ion =2 , Township, 23 North , Range 5 east , W.M . , in King County , Washington ; thence south 87059120" east 147 feet to the point of beginning ; thence north 27037 ' 50" east 72 .02 feet ; thence south 57047110" east 129 . 38 feet ; thence south 27037150" west 136 . 17 feet ; thence north 57147110" west 118 feet , more or less , to the centerline of existing creek ; thence northerly along the centerline of said creek 85 feet , more or less , to a point which bears north 57047 ' 10" west from the point of beginning ; thence south 57°47 ' 10" east 23 feet , more or less , to the point of beginning . PARCEL B : That portion of Government Lot 6 , Section 16 , Township 23 north , range 5 east , W.M. , in King County , Washington , lying northeasterly of the northeasterly line of the plat of Maplewood Division No . 2, according to the plat recorded in Volume 39 of Plats , Page 39 , in King County, Washington , as extended northwesterly across the right-of-way of the Defense Plant Corporation as indicated by dotted lines on the plat of Maplewood Div. No . 2, and southeasterly of the northwesterly line of Defense Plant Corporation right-of-way; ALSO The southeast quarter of the southeast quarter of Section 16 , Township 23 north , range 5 east , W.M. , in King County , Washington ; STATUTORY WARRANTY DEED PAGE 1 Exhibit A, page 2 of 4 Except that oortion pla* ted as Maplewood Div . No . 2 according to the plat recorded in Volume 39 of Plats , Page 39 , in King County , Washington . PARCEL C : That portion of Government Lot 1 , Section 21 , Township 23 north , range 5 east , W.M. , in King County , Washington , lying northerly of State Highway No . 5; Except that portion platted as Maplewood Div. No . 2 , according to the plat recorded in Volume 39 of Plats , Page 39 , in King County, Washington. PARCEL D : G: L:j LI That portion of the northwest auarter of the northwest quarter and of Government Lot 10 in Section 22, Township C 23 north , range 5 east , W.M. , in King County, Washington , ^1 lying northerly of State Highway No . 5 and lying northerly C of the Pacific Coast Coal Railroad right-of-way; s Together with that portion of County Road No . '11 40 , vacated by order entered October 16 , 1939 in Volume 38 of Commissioner ' s Records , page 7 ; Except that portion thereof described as follows : Commencing at the northwest corner of Section 22, Township 23 north , range 5 east , W.M. , in King County , Washington ; thence south 87059120" east 147 feet to the point of beginning ; thence north 27037 ' 50" east 72.02 feet ; thence south 57047110" east 129 . 38 feet ; thence south 27037150" west 136 . 17 feet ; thence north 57047 ' 10" west 118 feet , more or less , to the centerline of existing creek; thence northerly along the centerline of said creek 85 feet , more or less , to a point which bears north 57047 ' 10" west from the point of beginning ; thence south 57047110" east 23 feet , more or less , to the point of beginning . PARCEL E : Government Lot 6 of Section 22, Township 23 north, range 5 east , W.M. , in King County, Washington ; Except that portion thereof described as follows : Beginning at the north quarter corner of said section ; thence south 1008121 " west along the north and south centerline of said Section 30. 00 feet ; thence north 87059120" west 150.51 feet to the beginning of a curve to the right with a radius of 330. 00 feet ; thence westerly along said curve through a central angle of 24°37112" an arc distance of 141 . 80 feet to intersect the north line of STATUTORY WARRANTY DEED PAGE 2 Exhibit A, page 3 of 4 said section ; .hence south 705912011 east 2807 • 53 feet tc the point of beginning . PARCEL F : South half of the south half of the northwest quarter of the southwest quarter of the southwest quarter of Section 15, Township 23 north, range 5 east , W.M. , in King County , Washington . SUBJECT TO: CJ 1 . Ri -hts claimed under deeds a recorded under King County Recording Nos . 3413714 and 4660 ; 2. Easements recorded under King County Recording C� Nos . 1971852, 3332114, 44272792 4427281 , 4 5743790 , 5275717, 5155315 , 5913518 , 7609030618, 7703030695, 7305100471 , 7703030696 and 7809071072 , and 7809071068; 3. Easements established by proceedings in King County Superior Court Cause Nos . 486190 , 499210 and 748; Y. Reservations contained in instrument recorded under King County Recording No. 241250 ; 5 . Questions that may arise due to the shifting or change in the course of the Cedar River or the unnamed creek on the premises , or right of the State of Washington in and to _that portion of the premises , if any, lying in the old and new beds of the Cedar River ; 6 . Agreement recorded under King County Recording No . 7502140608 . r DATED: January 3 / 1985 . MAPLEWOOD GOLF AND COUNTRY CLUB ,_ a Washington corporation l By President By Vcretary ti. STATUTORY WARRANTY DEED PAGE 3 Exhibit A, page 4 of 4 STATE OF WASHINGTON ) ss COUNTY OF KING ) OnJ�is day personally appeared before me �GcriS and C�`h� GV65ch to me known to be the President and Secretary, respectively, of MAPLEWOOD GOLF AND COUNTRY CLUB, the corporation that executed the foregoing instrument , and acknowledged the said instrument to be the free and voluntary act and deed of the corporation , for the uses and purposes therein mentioned, and on oath stated that they are authorized to execute the instrument . DATED: January �/ , 1985 . �7 O Notary Public in and for the State of Washington , residing at Renton . STATUTORY WARRANTY DEED PAGE 4 DEVELOPMENT PLANNING (:ITV Pr7 7NITt' tiTA'Ip I LE •_ NEAR 1 91996 < x NT � �yt rn�nacv RECEIVED State of Washington DEPARTMENT OF FISH AND WILDLIFE Mailing Address: 600 Capitol Way N, Olympia, WA 98501-1091 -(206) 902-2200;TDD (206)902-2207 Main Office Location: Natural Resources Building, 1111 Washington Street SE, Olympia, WA March 15, 1996 Mark R . Pywell City of Renton' Department of Works 200 Mill Avenue South Renton, Washington 98055 SUBJECT: Determination of Non-Significance - Maplewood Creek Flooding and Habitat Improvement Projects - LUA-96-009, Maplewood Creek, Tributary to Cedar River, King County, WRIA 08 . 0302 Dear Mr . Pywell : The Washington Department of Fish and Wildlife (WDFW) has reviewed the above-referenced document and submits the following comments . As noted in the "MAPLEWOOD CREEK FISH PASSAGE CHANNEL Riparian and Instream Habitat Report", the construction and maintenance of the channel is a mitigation measure for the expansion and operation of the sedimentation basin . WDFW views the new channel as an opportunity to restore production of anadromous fish to Maplewood Creek and provide habitat in the reach through the golf course . Thus, the channel should not be considered a "fish passage channel "; rather, it is a reach of creek which should be capable of providing substantial spawning and rearing habitat for salmonid fish . WDFW appreciates the efforts of the City in designing habitat features into the project and hopes to collaborate with the City of Renton to manage the channel in a manner which provides this habitat without impairing the operation of the golf course . As was d1SCu:352ij at the FebrUa y between -y of '::�Gn any WDFW �`dtf , CVi1j�iU�ti0; li1V �vin<j `ii_ sF"3:menT i GIiC idtlu adjacent and uos-tLeam work ) sh.ou1 , be c leat.i'=("_ t ) conclude prior to the commencement of fall rains . ( ictober 1 is considered a safe target date . ) Construction of the new Maplewood Creek channel could occur after the construction of the sediment pond, with riparian plantings during the dormant -season being given time to become established prior to sending flows down the new channel . Mark R. Pywell Page 2 March 14, 1996 It will be necessary to add spawning gravels to the new channel f file intercept�Uri and rC:IIUVai cf Large quantitiesto mitigate of these size materials by the sedimentation basin . This and suitable design changes which should be added prior to submittal of the Hydraulic Project Application were discussed at the February 1 meeting . Thank you for the opportunity to comment . If you have questions or need additional information, please call me at ( 206 ) 39- 2-9159 . We appreciate your cooperation in our efforts to protect, perpet- uate , and manage the fish resources of the state of Washington . Sincerely, Larry Fisher Area Habitat Biologist Habitat Management Program if cc : WPFW, Banyard WDFW, Heiner WDFW, Muller MIT Fisheries , Malcom FI LE' CITY OF RENTON MEMORANDUM Date: February 27, 1996 1�JIN 1 ;3 To: Daniel Carey/Surface Water Uitlity F EB 2 911996 From: ?Mark R. Pywell, AICP/for Environmental Review Committee C,TY CF RENTON EngineQring Dept, Subject: Maplewood Creek Flooding and Habitat Improvement Project No. LUA-96-009,SM,ECF On behalf of the Environmental Review Committee, I would like to inform you that they have completed their review of your project. The Committee, on February 27, 1996, decided that the subject project will be issued a Determination of Non-Significance. The City of Renton Environmental Review Committee has determined that it does not have a probable significant adverse impact on the environment. An environmental impact statement (EIS) is not required under RCW 43.21C.030(2)(c). This decision was made by the Environmental Review Committee under the authority of Section 4-6-6, Renton Municipal Code, after review of a completed environmental checklist and other information, on file with the lead agency. This information is available to the public on request. The 15 day comment period with concurrent 14 day appeal period for this project will end at 5:00 PM on March 19, 1996. Following this, the City will finalize its Determination unless comments received require a reevaluation. Appeal procedures imposed by the City of Renton's Environmental Review Committee are available at the Development Services Division, Third Floor, Municipal Building, Renton, Washington 98055. Phone: 235-2550. You should be prepared to make specific factual objections. If you have any questions or desire clarification of the above, please call me at extension 5586. dnsmm ;yf CITY JF RENTON Planning/Building/Public Works Department Jesse Tanner,Mayor Gregg Zimmerman P.E.,Administrator February 27, 1996 TO: Parties of Record SUBJECT: Maplewood Creek Flooding and Habitat Improvement Project No. LUA-96-009,SM,ECF Dear Reader. This letter is written on behalf of the Environmental Review Committee and is to inform you that they have completed their review of the environmental impacts of the above-referenced project. The Committee, on February 27, 1996, decided that your project will be issued a Determination of Non-Significance. The City of Renton Environmental Review Committee has determined that it does not have a probable significant adverse impact on the environment. An environmental impact statement (EIS) is not required under. RCW 43.21 C.030(2)(c). This decision was made by the Environmental Review Committee under the authority of Section 4-6- 6, Renton Municipal Code, after review of a completed environmental checklist and other information, on file with the lead agency. This information is available to the public on request. The 15 day comment period with concurrent 14 day appeal period for this project will end at 5:00 PM on March 19, 1996. Following this, the City will finalize its Determination unless comments received require a reevaluation. Appeal procedures imposed by the City of Renton's Environmental Review Committee are available at the Development Services Division, Third Floor, Municipal Building, Renton, Washington 98055. Phone: 235-2550. You should be prepared to make specific factual objections. If you have any questions or desire clarification of the above, please call me at 277-5586. For the Environmental Review Committee, Mark R. P , AICP Project Ma alter Parties of Record: O.J. Waffle DNSLTR.DOC 200 Mill Avenue South - Renton, Washington 98055 ®This paper contains 50%recycled matenal,25%post consumer CITY OF RENTON DETERMINATION OF NON-SIGNIFICANCE APPLICATION NO(S): LUA-96-009,SM,ECF APPLICANT: CITY OF RENTON/SURFACE WATER UTILITY PROJECT NAME: MAPLEWOOD CREEK FLOODING AND HABITAT IMPROVEMENT PROJECTS DESCRIPTION OF PROPOSAL: The City proposes to construct a low flow fish channel across the golf course and a sedimentation pond. LOCATION OF PROPOSAL: 4050 Maple Valley Highway/Maplewood Golf Course LEAD AGENCY: City of Renton Department of Planning/Building/Public Works Development Planning Section The 15 day comment period with concurrent 14 day appeal period for this project will end on March 19, 1996. Following this, the City will finalize its Determination unless comments received require a reevaluation. Appeal procedures imposed by the City of Renton's Environmental Review Committee are available at the Development Services Division, Third Floor, Municipal Building, Renton, Washington 98055. Phone: 235-2550. You should be prepared to make specific factual objections. PUBLICATION DATE: March 4, 1996 DATE OF DECISION: February 27, 1996 SIGNATURES: A pa-7 v/&cl�loy", 71 Z-712 Gregg merry A mini trator DAT Depart t of Planning/Building/Public Works 7-- Sam Chastain, Administrator DATE Community Service Department Le1V,teel "r, ire ief DATE Hen on Fire Department DNSSIG.DOC fi S1uJ--( Cdrn ?'Y,, STAFF City of Renton REPORT Department of Planning/Building/Public Works ENVIRONMENTAL REVIEW COMMITTEE A. BACKGROUND ERCMEETING DATE February 27, 1996 Project Name Maplewood Creek Flooding and Habitat Improvement Projects Applicant City of Renton Surface Water Utility File Number LUA-096-009,ECF,SM Project Manager Mark Pywell / Daniel Carey Project Description Phase 1 will construct a new low-flow fish passage channel across the golf course. The new channel will begin at the reconstructed sediment basin at the north side of the golf course(at the existing basin location), and will extend to the southwest corner of the golf course where it will be connected to an existing fish ladder(constructed by WSDOT)that goes under SR 169 to the Cedar River. The new channel will be about 1850 feet long, 12 to 26 feet wide, and 4 feet deep. The sides will be vegetated to provide shelter and fish habitat. All low flows in Maplewood Creek will be diverted to the new channel. The existing creek channel will be used to convey higher storm flows in Maplewood Creek. Phase 2 will reconstruct the existing sedimentation basin at the north side of the golf course(north of the old club house). The new basin will be about 160 feet long, 90 to 150 feet wide, and 6 1/2 feet deep. A system of concrete spillways will direct low flows to the new fish passage channel, and higher flows to the existing channel for Maplewood Creek. An old concrete dam, about 500 feet upstream of the existing basin, will be notched to allow the creek to reestablish a natural now. Unstable and eroding side slopes next to the construction areas will be stabilized with riprap and replanted with vegetation. The sedimentation basin and new fish passage channel may be constructed from September 2 through October 31, 1996, provided that the Department of Fish and Wildlife will grant approval to for construction outside the normal fisheries construction window(June 15 through Sept. 15 ). Project Location The project is located on the western side and in the middle of the Maplewood Golf Course. The golf course is located at 4050 Maple Valley Highway(SR 169). Exist. Bldg. Area gsf N/A Proposed New Bldg. Area gsf N/A Site Area Approx. 75,000 sf of Total Building Area gsf N/A construction area. Project Location Map DC-ERGDOC _1I City of Renton P/B/PW Department Environmental Review Committee Staff Report s ' MAPLEWOOD FISH CHANNEL LUA-96-009,ECF,SM REPORT AND DECISION OF February 27, 1996 Page 2 of 8 RECOMMENDATION Staff Recommend that the Environmental Review Committee issue a Determination of Non-Significance. f City of Renton PIBIPW Department Environmental Review Committee Staff Report MAPLEWOOD FISH CHANNEL LUA-96-009,ECF,SM REPORT AND DECISION OF February 27, 1996 Page 3 of 8 B. RECOMMENDATION Based on analysis of probable impacts from the proposal, staff recommend that the Responsible Officials make the following Environmental Determination: DETERMINATION OF DETERMINATION OF NON-SIGNIFICANCE NON-SIGNIFICANCE-MITIGATED. Issue DNS with 14 day Appeal Period. Issue DNS-M with 15 day Comment Period with Concurrent 14 day Appeal Period. X Issue DNS with 15 day Comment Period with Issue DNS-M with 15 day Comment Period followed Concurrent 14 day Appeal Period. by a 14 day Appeal Period. C. MITIGATIONMEASURES No further mitigation measures beyond those contained in the project description, and as part of the normal construction process, are recommended. Advisory Notes to Applicant: The following notes are supplemental information provided in conjunction with the environmental determination. Because these notes are provided as information only,they are not subject to the appeal process for environmental determinations PARKS DEPARTMENT COMMENTS A. ENVIRONMENTAL IMPACT COMMENTS 1. Class III wetland setback requirements,although being created,have impacts to planned future development. 2. Crossing of fairways and streambed important not only to the golfer but to maintenance crews as well. Recommend a combination of culverts and bridges in order to accommodate both the golfer and maintenance crews. 3. Where channel crosses the fairway, grasses need to be planted with the intent of mowing. At other locations trees and shrubs are acceptable as long as appropriate plants at mature heights are compatible with the course. Plant locations and materials to be coordinated with the golf course architect and parks director. B. POLICY-RELATED COMMENTS 1. City Council adopted a Master Plan for Maplewood Golf Course in 1987,three phases have already been implemented. Phase IV has not been completed and includes development of the#2 green,#4 tee,95 green,and#6 tee. These future improvements should be exempt from the 25 foot setback for wetlands (Class III)along the fish passage channel as these wetlands are being created, and the construction of the fish passage channel is preceding the Phase IV golf course development. Improvements to the course have been occurring over a number of years, and all according to the adopted Master Plan. In addition this channel provides stormwater management which is exempt or not considered regulated wetlands. 2. Recommend a combination of culvert and prefabricated bridge crossings at designated locations to be coordinated with golf course architect and manager. 3. During construction temporary bridges and/or crossings need to be in place to facilitate maintenance of the course. 4. Recommend no clover in the wildflower mix. 5. It appears some areas were identified as wetlands where hydrology and wetland vegetation were evident, but hydric soils were presumed (page 8, Wetland Determination Report). It is my understanding hydric soils are required in order to designate an area as a wetland. FIRE PREVENTION COMMENTS C. CODE-RELATED COMMENTS City of Renton PIBIPW Department Environmental Review Committee Staff Report MAPLEWOOD FISH CHANNEL LUA-96-009,ECF,SM REPORT AND DECISION OF February 27, 1996 Page 4 of 8 1. Maintain emergency access at all times. D. ENVIRONMENTAL IMPACTS Whether the applicant has adequately identified and addressed environmental impacts anticipated to occur in conjunction with the proposed development? 1. Earth Impacts: The fish passage channel will require excavating approximately 8,000 cy of soil on the golf course. Some of the soil would be used for channel grading and side berms. The remainder would be used for the sediment basin construction, stockpiled and used for landscaping on the golf course, or would be disposed of off site by the contractor. About 1,600 cy of clay soil and 400 cy of gravel may be imported to use for constructing the new channel. During construction the new fish channel would be used as its own sediment pond. Rainfall runoff would be allowed to settle in the channel before water is discharge to the fish ladder and Cedar River. Sediment control features such as silt fences and hay bales are proposed. Flow from Maplewood Creek would not be diverted into the new fish channel until after the new sediment basin is complete. The sediment basin will require the excavating approximately 3,500 cy of soil to deepen and widen the basin. Some of the soil will be used for construction of the new basin. The remainder may be stockpiled and used for landscaping on the golf course, or would be disposed of off site by the contractor. The accumulated sediment behind the upper concrete dam would be removed before the dam is notched. About 200 cy of fill and rock may be used to stabilize the steep slopes next to the upper dam and new sediment basin. Clay soil for the new sediment basin, fill soil, and rock would be imported for construction of the new basin and slope stabilization. Construction would probably start with removal of the upper dam and slope stabilization. The existing sediment basin would be kept in operation to collect any sediment that may occur during that work. During construction, flow from Maplewood Creek will have to be diverted around the construction area. Silt fences, hay bales, and other erosion best management practices (BMP's) would be used to prevent soil from eroding and discharging to Maplewood Creek and the Cedar River. Mitigation Measures: No further mitigation measures are recommended,beyond those proposed by the applicant. Nexus: N/A 2. Air Impacts: Temporary exhaust and dust from construction activities. The City will require that the contractor maintain proper functioning exhaust systems on construction equipment. The contractor will be required to water any soil areas if blowing dust becomes a problem. Mitigation Measures: No further mitigation measures are recommended, beyond those proposed by the applicant. Nexus: N/A 3. Surface Water Impacts: Construction of the new sedimentation basin, notching of the upper concrete dam, and slope stabilization will all involve work within Maplewood Creek, and the potential for erosion and sedimentation. Construction in Maplewood Creek would probably start with removal of the upper dam and slope stabilization. The existing sediment w City of Renton PIB/PW Department Environmental Review Committee Staff Report MAPLEWOOD FISH CHANNEL LUA-96-009,ECF,SM REPORT AND DECISION OF February 27, 1996 Page 5 of 8 basin would be kept in operation to collect any sediment that may occur during the first part of the work. During construction, flow from Maplewood Creek will have to be diverted around the construction area. Silt fences, hay bales, and other erosion best management practices (BMP's) would be used to prevent soil from eroding and discharging to Maplewood Creek and the Cedar River. The new sedimentation basin will have about three times the volume of the existing basin, and two times the sediment storage volume(600 cy). After it is completed it will collect more sediment than the existing basin, and should reduce the annual amount of sediment migrating downstream into the channel for Maplewood Creek and the Cedar River. The project will permanently divert low flows (0 to 20 cfs) from the existing Maplewood Creek channel into the new fish passage channel. Above 20 cfs, part of the flow will go to the new fish channel, and an increasing part of the flow will go to the existing channel. For 94 cfs coming into the new basin, about 29 cfs will go to the fish passage channel and 65 cfs will go to the existing channel. For the peak flow from the 100-year storm event the models predict that 45 cfs would go to the new fish passage channel and 347 cfs would go to the existing channel. The average annual flow for Maplewood Creek is approximately 3.2 cfs. A private residence on the golf course is located along the east side of the existing creek. After the creek is diverted to the new fish passage channel, the existing channel is expected to be dry for the majority of the year. The private residence will not have the creek flowing on its west property boundary for the majority of the year. The Washington State Department of Fish and Wildlife (WSDFW) has indicated that as much flow as possible should be directed into the new fish passage channel for migration and habitat purposes. The low average annual flow from Maplewood Creek make it unlikely that WSDFW will allow a portion of the flow to be diverted to the existing creek channel when it will no longer be able to support fish migration Previous reports stated that it was possible for salmon to migrate from the Cedar River, up the 900 foot long, 72-inch diameter culvert, into the creek on the golf course. By effectively drying up the existing channel this possible migration route will be unavailable for salmon. Any trout or other aquatic life living in the existing creek and sediment basin construction areas will be impacted by construction. The new fish passage channel will be connected to the existing fish ladder that was constructed by the WSDOT. The new channel will be designed to allow salmon to migrate from the fish ladder across the golf course, into the new sedimentation basin, and into the Maplewood Creek ravine above the sediment basin. Currently, the existing sediment basin is not fish passable and blocks potential fish migration into Maplewood Creek ravine. The fish channel will also contain about 0.76 acres more habitat and vegetation features than the existing channel. The new channel will be about 1850 feet long and will contain about 0.34 acres of perennial stream and 0.68 acres of new wetland. The existing channel is about 950 feet long and contains about 0.09 acres of perennial stream and 0.17 acres of disturbed wetland. It should also be noted that recent heavy rains ( Feb. 6 thru 9, 1996) washed a large amount of sediment into the existing creek bed on the golf course. The new sediment has probably caused severe impacts to the habitat and any aquatic life in the existing creek. The existing sediment basin and pond behind the upper dam are currently full of accumulated sediment. Mitigation Measures: No further mitigation measures are recommended, beyond those proposed by the applicant. Nexus: N/A 4. Wetlands City of Renton P/B/PW Department Environmental Review Committee Staff Report MAPLEWOOD FISH CHANNEL LUA-96-009,ECF,SM REPORT AND DECISION OF February 27, 1996 Page 6 of 8 Impacts: Areas along the banks of the upper concrete dam, the existing sediment basin, and the existing Maplewood Creek channel contain low quality wetland vegetation, and were classified as wetlands by the City's consultant. The areas around the sediment basin and upper concrete darn do not meet the City's definition for regulated wetlands because they are part of storrnwater facilities. However, they would be considered as wetlands by the Army Corps of Engineers. The existing Maplewood Creek channel would be classified as a Category 3 wetland in the City's ordinance since it has been disturbed by channelization, ditching, and repeated cleaning of accumulated sediment. The wetland vegetation in the vicinity of the upper concrete dam, slope stabilization areas, and existing sediment basin would be destroyed during project construction. The wetland vegetation along the existing creek channel would be impacted when flow is diverted to the new fish passage channel. After construction wetland vegetation will have the opportunity to reestablish itself along the stream bank near the upper concrete dam, the slope stabilization areas, and along the perimeter of the new sediment basin. These areas will also be replanted with native vegetation. The new fish passage channel will be replanted with native habitat and wetland type vegetation to provide fish habitat and shelter. Approximately 0.42 acres of existing wetlands would be affected by project construction. About 1.45 acres of new wetlands would be created by enlarging the sediment basin and constructing the longer fish passage channel. Under the City's Wetland Ordinance a replacement ration of 1.5 to 1 is typically required for category 3 wetlands. The new fish passage channel project will provide a replacement ratio of about 3 to 1 for all wetland impacts. Mitigation Measures: No further mitigation measures are recommended, beyond those proposed by the applicant. Nexus: N/A S. Noise Impacts: There will be a temporary increase in noise from construction equipment during construction. The City will require that the contractor maintain proper functioning exhaust systems on construction equipment, and not start operating equipment before 7 a.m. Normal working hours will be from 7 a.m. to 5 p.m. Mitigation Measures: No further mitigation measures are recommended, beyond those proposed by the applicant. Nexus: N/A 6. Utilities Impacts: The new fish passage channel will cross over the top of the Maplewood Water Transmission Mains ( 2 16- inch, 1 12-inch) and the empty chemical and electrical conduits in the middle of the golf course. At the south side of the golf course, north of SR 169,the new channel may need to cross over a 16-inch water main and private utility lines (telephone, TV, electric). The new channel design will be reviewed and approved by the Water Utility to avoid impacts to the water mains where it will cross them. The electric and chemical conduits are empty and may be lowered to clear the new channel. The location and elevation of the private utilities north of SR 169 will be investigated before construction. The new channel will be designed to clear the private lines, or they may be lowered below the proposed channel Mitigation Measures: No further mitigation measures are recommended, beyond those proposed by the applicant. Nexus: N/A 7. Recreation City of Renton PIBIPW Department Environmental Review Committee Staff Report MAPLEWOOD FISH CHANNEL LUA-96-009,ECF,SM REPORT AND DECISION OF February 27, 1996 Page 7 of 8 Impacts: Bridge or culvert crossings will be needed for the new fish channel to allow unimpeded use by golfers and the maintenance crews. During construction, temporary bridges and crossing may be needed to allow public use and maintenance of the golf course. Plantings along the channel sides on the fairways should be low grass that can be mowed to avoid affecting golf course play. Plantings off the fairway may be taller grass, shrubs, and trees as long as they are compatible with the golf course. Proposed plant locations and material should be coordinated with the Parks Department and golf course architect. The Surface Water Utility is working with the Parks Department and golf course architect to identify all creek crossings and proposed vegetation areas along the new fish passage channel. The construction plans can include temporary crossings, if needed. The final plans will have to contain channel crossings and a vegetation plan that is acceptable to both the Surface Water Utility and the Parks Department The Category 3 wetland setback requirements may have an impact to planned future development and maintenance of the golf course. Phase IV of the golf course master plan (adopted by City Council in 1987) has not been completed, but includes constructing new tees and green that would be within the 25 foot setback for Category 3 wetlands. These future improvements should be permitted within the 25 foot setback,and exempted from any additional requirements. In the City of Renton ordinances, Chapter 32 Wetlands Management, Section 4-32-4 Allowed And Regulated Activities, states that: A. "The following activities shall be allowed within a wetland or wetland buffer to the extent they are not prohibited by any other chapter or law and provided that they are conducted using best management practices . . . ,wetland impacts are minimized and that disturbed areas are immediately restored . . . and further provided that they are given prior written confirmation of their allowed activity status by the Department Administrator:" 4. "Normal and routine maintenance and repair of any existing public or private uses and facilities where no alteration of the wetland or additional fill materials will be placed. . . . In every case, wetland impacts shall be minimized and disturbed areas shall be restored during and immediately after the use of construction equipment. " The new fish channel and plantings are being planned to minimize or avoid impacting existing and future golf course features, such as tees, fairways, and greens. Future golf course remodeling is not anticipated to require construction within the channel or defined wetland (about 3 feet of each bank), but may involve construction within the 25 foot buffer. After any construction the vegetation would be restored to the type that was there before construction, or to another type that would be consistent with golf course uses. Prior to constructing future Master Plan improvements to the golf course, the Parks Department could request that the Department Administrator provide written confirmation that future golf course remodeling and normal maintenance activities, including maintenance of the new fish passage channel, are allowed activities within the wetland and 25 foot buffer area, provided that they meet the intent of section 4-32-4, and that any wetland impacts are minimized and restored after construction. Mitigation Measures: No further mitigation measures are recommended, beyond those proposed by the applicant. Nexus: N/A City of Renton P/B/PW Department Environmental Review Committee Staff Report MAPLEWOOD FISH CHANNEL LUA-96-009,ECF,SM REPORT AND DECISION OF February 27, 1996 Page 8 of 8 E. COMMENTS OF REVIEWING DEPARTMENTS The proposal has been circulated to City Departmental/Divisional Reviewers for their review. Where applicable,these comments have been incorporated into the text of this report as Mitigation Measures and/or Notes to Applicant. Copies of all Review Continents are contained in the Official File. Copies of all Review Comments are attached to this report.. City of r..,nton Department of Planning/Building/Pubs., Works ENVIRONMENTAL & DEVELOPMENT APPLICATION REVIEW SHEET REVIEWING DEPARTMENT: P'(a-VA R COMMENTS DUE: FEBRUARY 'I�'F NTON APPLICATION NO: LUA-96-009,SM,ECF DATE CIRCULATED: JANUARY 31, 1996 APPLICANT: CITY OF RENTON/SURFACE WATER UTILITY PROJECT MANAGER: MARK PYWELC ! PROJECT TITLE: MAPLEWOOD FISH CHANNEL WORK ORDER NO: 78051 LOCATION: 4050 Maple Valley Highway/Maplewood Golf Course SITE AREA: 75,000 Sq. Ft. of construction area I BUILDING AREA(gross): N/A SUMMARY OF PROPOSAL: THE CITY PROPOSES TO CONSTRUCT A LOW FLOW FISH CHANNEL ACROSS THE GOLF COURSE AND A SEDIMENTATION POND. A. ENVIRONMENTAL IMPACT(e.g.Non-Code) COMMENTS Element of the Probable Probable More Element of the Probable Probable More Environment Minor Ma/or Information Environment Minor Ma/or Informadon Impact= Impacts Necessary Impacts Impacts Necessary Earth Housing Air Aesthetics wafer LightlGlare Plants Recreauon LancvShongine Use Utillties Animals Transportadon Environmental Health Public services Energy/ HistorklCultural Natural Resources Preservation B. POLICY-RELATED COMMENTS C. CODE-RELATED COMMENTS �`�`D G D>M Yv1���• We have reviewed this appffcatlon with particular attention to those areas in which we have expertise and have identified areas of probable impact or areas where adaVffonal information is needed to property assess this proposal. Signature of Director or Authorized Representative Date DEVAPP.DOC Rev.10M City of nanton Department of Planning/Building/Pubs,, Works ENVIRONMENTAL & DEVELOPMENT APPLICATION REVIEW SHEET REVIEWING DEPARTMENT: wV-- COMMENTS DUE: FEBRUARY 15, 1996 APPLICATION NO: LUA-96-009,SM,ECF DATE CIRCULATED: JANUARY 31, 1996 APPLICANT: CITY OF RENTON/SURFACE WATER UTILITY PROJECT MANAGER: MARK PYWELL PROJECT TITLE: MAPLEWOOD FISH CHANNEL WORK ORDER NO: 78051 LOCATION: 4050 Maple Valley Highway/Maplewood Golf Course SITE AREA: 75,000 Sq. Ft. of construction area I BUILDING AREA(gross): N/A. SUMMARY OF PROPOSAL: THE CITY PROPOSES TO CONSTRUCT A LOW FLOW FISH CHANNEL ACROSS THE GOLF COURSE AND A SEDIMENTATION POND. A. ENVIRONMENTAL IMPACT(e.g.Non-Code) COMMENTS Element of the Probable Probable More Element of the Probable Probable More Environment Minor Major Information Environment Minor Major Information Impacts Impacts Necessary Impacts Impacts Necessary Earth Housing Air Aesthetics Water LightlGlare Plants Recreation LandShorellne Use UtilRJes Animals Transportation Environmental Heelth Pudic Services Energy/ Historic/Cultural Natural Resources / ? Preservstfon /V 0 A14 f 01- B. POLICY-RELATED COMMENTS AJl4 C. CODE-RELANTED COMMENTS /-� Inae n c; dcc a s s o f f We have reviewed is application with particular attention to those areas in which we have expertise and have identified areas of probable impact or areas where additional in rmadon is needed party assess this proposal. Signature of DIr)&tor or Authorized Repre- Date DEVAPP. Rev.10193 City of nenton Department of Planning/Building/Put-- Works ENVIRONMENTAL & DEVELOPMENT APPLICATION REVIEW SHEET REVIEWING DEPARTMENT:SILK a wCIS -COMMENTS DUE: FEBRUARY.-�,ABA@kToto mot";+rP'rl APPLICATION NO: LUA-96-009,SM,ECF DATE CIRCULATED: JANUARY 31, 1996 APPLICANT: CITY OF RENTON/SURFACE WATER UTILITY PROJECT MANAGER: MARK PYWE PROJECT TITLE: MAPLEWOOD FISH CHANNEL WORK ORDER NO: 78051 Z—i v 1.y1 LOCATION: 4050 Maple Valley Highway/Maplewood Golf Course SITE AREA 75,000 Sq. Ft. of construction area I BUILDING AREA(gross): N/A SUMMARY OF PROPOSAL: THE CITY PROPOSES TO CONSTRUCT A LOW FLOW FISH CHANNEL ACROSS THE GOLF COURSE AND A SEDIMENTATION POND. A. ENVIRONMENTAL IMPACT(e.g.Non-Code) COMMENTS Element of the Probable Probable More Element of the Probable Probable More Environment Minor Major Information Environment Minor Major Information Impacts Impacts Necessary Impacts Impacts Necessary Earth Housing Air Aesthetics water UghVGIars Plants Recreation LandrShorellne Use utilities Animals A Trans Lion Environmental Hearth Public Services Energy/ HJstorldCuifural Natural Resoumw Preservation B. POLICY-RELATED COMMENTS C. CODE-RELATED COMMENTS Jo c c)m wl eh� . We have reviewed this application with particular attention to those areas in which we have expertise and have identified areas of probable impact or areas where additional information is needed to properly assess this proposal. Signature of Director or Authorized Representative Date DEVAPP.DOC Rev.10M City of ..enton Department of Planning/Building/Pu...- Works ENVIRONMENTAL & DEVELOPMENT APPLICATION REVIEW SHEET REVIEWING DEPARTMENT: a COMMENTS DUE: FEBRUARY 15, 1996 APPLICATION NO: LUA-96-009,SM,ECF DATE CIRCULATED: JANUARY 31, 1996 acrr n c APPLICANT: CITY OF RENTON/SURFACE WATER UTILITY PROJECT MANAGER: MARK PYWELL i PROJECT TITLE: MAPLEWOOD FISH CHANNEL WORK ORDER NO: 78051 LOCATION: 4050 Maple Valley Highway/Maplewood Golf Course BUiLDh1 %j viyiSION SITE AREA 75,000 Sq. Ft. of construction area I BUILDING AREA(gross): N/A SUMMARY OF PROPOSAL: THE CITY PROPOSES TO CONSTRUCT A LOW FLOW FISH CHANNEL ACROSS THE GOLF COURSE AND A SEDIMENTATION POND. A. ENVIRONMENTAL IMPACT(e.g. Non-Code) COMMENTS Element of the Probable Probable More Element of the Probable Probable More Environment Minor Major Information Environment Minor Major Information Impacts Impacts Necessary Impacts Impacts Necessary Earth Housing Air Aesthetics Water Light/Glare Plants Recreation Land'Shorellne Use UdRtles Animals Transportation Environmental Heath Publk Services Energy/ HistorkXutural Natural Resources Preservation B. POLICY-RELATED COMMENTS 7 C. CODE-RELATED COMMENTS /AJ0 G v�i na e We have reviewed this application with particular attention to those areas in which we have expertise and have identified areas of probable impact or areas where additional information is needed to properly assess this proposal. Signature of Director or Authorized Representative Date DEVAPP.DOC Rev.10M . j City of.. iton Department of Planning/Building/Put.. /orks ENVIRONMENTAL & DEVELOPMENT APPLICATION REVIEW SHEET REVIEWING DEPARTMENT: tCJQ,o COMMENTS DUE: FEBRUARY 15, 1996 APPLICATION NO: LUA-96-009,SM,ECF DATE CIRCULATED: JANUARY 3*—.,V9W RENTON c K1 APPLICANT: CITY OF RENTON/SURFACE WATER UTILITY PROJECT MANAGER: MARK PYW?Lf rF �rG PROJECT TITLE: MAPLEWOOD FISH CHANNEL WORK ORDER NO: 78051 i 1QQ6 LOCATION: 4050 Maple Valley Highway/Maplewood Golf Course LAV§z...-tiH SITE AREA: 75.000 Sq. Ft. of construction area I BUILDING AREA(gross): N/Ae . SUMMARY OF PROPOSAL: THE CITY PROPOSES TO CONSTRUCT A LOW FLOW FISH CHANNEL ACROSS THE GOLF COURSE AND A SEDIMENTATION POND. A. ENVIRONMENTAL IMPACT(e.g. Non-Code) COMMENTS Element of the Probable Probable more Element of the Probable Probable More Environment Minor Major Information Environment Minor Ma/or Information Impacts Impacts Necessary Impacts Impacts Necessary Earth Housing Air Aesthetics Water LightlGlare Plants Recreation LancVShoreline Use Utilities Animals Transportation Environmental Health Pub/k Services Energy/ HlstorkJCultural Natural Resources Preservation B. POLICY-RELATED COMMENTS N� C. CODE-RELATED COMMENTS We have reviewed this application with pa 'cular atte to those areas in which we have expertise and have identified areas of probable impact or areas where additional information is ne d rty a i p pose!. Signature of Director or Authorized presentative Date 4 DEVAPP.DOC Rev.1 Olfl3 City of..anton Department of Planning/Building/Pub,,. Works ENVIRONMENTAL & DEVELOPMENT APPLICATION REVIEW SHEET REVIEWING DEPARTMENT: P61tc.�e COMMENTS DUE: FEBRUARY 15, 1996 APPLICATION NO: LUA-96-009,SM,ECF DATE CIRCULATED: JANUARY 31, 1996 APPLICANT: CITY OF RENTON/SURFACE WATER UTILITY PROJECT MANAGER: MARK PYWELL PROJECT TITLE: MAPLEWOOD FISH CHANNEL WORK ORDER NO: 78051 LOCATION: 4050 Maple Valley Highway/Maplewood Golf Course SITE AREA: 75,000 Sq. Ft. of construction area I BUILDING AREA(gross): WA SUMMARY OF PROPOSAL: THE CITY PROPOSES TO CONSTRUCT A LOW FLOW FISH CHANNEL ACROSS THE GOLF COURSE AND A SEDIMENTATION POND. A. ENVIRONMENTAL IMPACT(e.g. Non-Code) COMMENTS Element of the Probable Probable More Element of the Probable Probable More Environment Minor Major Information Environment Minor Major Information Impacts Impacts Necessary impacts Impacts Necessary Earth Housing Air Aesthetics WaterLight/Glare Plants Recreation LandrShore/lne Use Utilities Animals Transportation Environmental Health Public Services Energy/ Historir/culturai Natural Resources Pmservation L/k CCU 6 ;��6• U �%�� d' .. 9 B. POLICY-RELATED COMMENTS C. CODE-RELATED COMMENTS We have reviewed this application with particular attention to those areas in which we have expertise and have identffed areas of probable impact or areas where additional information is needed to properly assess this proposal. / Suture of Director/or AL#wked Representative Date DEVAPP.DOC Rev.10193 City of kenton Department of Planning/Building/Public Works ENVIRONMENTAL & DEVELOPMENT APPLICATION REVIEW SHEET REVIEWING DEPARTMENT: COMMENTS DUE: FEBRUARY 15, 1996 APPLICATION NO: LUA-96-009,SM,ECF DATE CIRCULATED: JANUARY 31, 1996 APPLICANT: CITY OF RENTON/SURFACE WATER UTILITY PROJECT MANAGER: MARK PYWELL PROJECT TITLE: MAPLEWOOD FISH CHANNEL WORK ORDER NO: 78051 LOCATION: 4050 Maple Valley Highway/Maplewood Golf Course SITE AREA: 75,000 Sq. Ft, of construction area I BUILDING AREA(gross): N/A SUMMARY OF PROPOSAL: THE CITY PROPOSES TO CONSTRUCT A LOW FLOW FISH CHANNEL ACROSS THE GOLF COURSE AND A SEDIMENTATION POND. A. ENVIRONMENTAL IMPACT(e.g. Non-Code) COMMENTS Element of the Probable Probable More Element of the Probable Probable More Environment Minor Major Information Environment Minor Major Information Impacts Impacts Necessary Impacts Impacts Necessary Earth Housing Air Aesthetics Water hVG/are Plants Recreation LancVShoreilne Use utilities Animals Transportation Environmental Health Public Services Energy/ HistorklCultural Natural Resources Preservation B. POLICY-RELATED COMMENTS N O C�o,^1/-I 0NT S C. CODE-RELATED COMMENTS We have reviewed this application with particular attention to those areas in which we have expertise and have identified areas of probable impact or areas where additional information is needed to properly assess this proposal. Signature of Director or Authorized Representative Date DEVAPP.DOC Rev.10/93 City of Icon Department of Planning/Building/PuG ✓orks ENVIRONMENTAL & DEVELOPMENT APPLICATION REVIEW SHEET REVIEWING DEPARTMENT: COMMENTS DUE: FEBRUARY 15, 1996 APPLICATION NO: LUA-96-009,SM,ECF DATE CIRCULATED: JANUARY 31, 1996 APPLICANT: CITY OF RENTON/SURFACE WATER UTILITY PROJECT MANAGER: MARK PYWELL PROJECT TITLE: MAPLEWOOD FISH CHANNEL WORK ORDER NO: 78051 LOCATION: 4050 Maple Valley Highway/Maplewood Golf Course SITE AREA 75,000 Sq. Ft. of construction area I BUILDING AREA(gross): WA SUMMARY OF PROPOSAL: THE CITY PROPOSES TO CONSTRUCT A LOW FLOW FISH CHANNEL ACROSS THE GOLF COURSE AND A SEDIMENTATION POND. A. ENVIRONMENTAL IMPACT(e.g. Non-Code) COMMENTS Element of the Probable Probable Mon Element of the Probable Probable More Environment Minor Ma/or Information Environment Minor Major information Impacts Impacts Necessary Impacts Impacts Necessary Earth Houslng Air Aesthetics wafer LightlGlare Plants Recreation Lancvshoreline Use WOOS Animals Transporration Environmental Health Public Servkes Energy/ HistwiGCuttural Natural Resources Preservation fi .01 n 41e �f j per hbf o n lr�o1c� ,fled �► ��b �itrr� ����c�ru.>�-� .Chb��e/Gr�.ss��- �e- �l�ar�✓ foiev- au 1c _as /o.-� dS �,ZF� lolar>>�s- c.>` /nd � /�ei h crrc— n�or��id� �v/ 7�h'�)(t�, cvvse. /dh f/10 CC!h� ai r./ B. POLICY-RELATED COMMENTS /gY7v�e�,o`� c?l2�rz'y t� _e�7 mei7r�C� �'hri.Te �hca� szd7"�Ze��7 c8���C� it ���G1 inc/cx�c�i ck✓e%/ �a� � � ,� , �� �, a s s; q•�c/ .�t�;�e—�7yie�- i,->7 rv;x.:�->cnf� � c�r�z -Xer�p �c�c�c is ix�c�/�he i e�-a �1 drill tic cv�.s7rzX�ro''� e er> 7b r Y1�'�,r'� � y�cou�A --her � . /n aa'�� �� c ue/ �orov��'� s76 fG G,fY7 tee !� P /S Gxe.� �O�rJGy =Or��Le l29r �Cf 1une.�S 1/ Ewe 9C ter" C. CODE-RELATED COMMENTS 1 LI S We have reviewed this appNcation with particular attention to those areas in which we have expertise and have identified areas of probable impact or areas where additional information is needed to prope assess this propose *k Ignatu Director or Authorized Representative to DEVAPP.DOC _ Rev.10193 C-41Y-66w - Q/ --- -- --- arck"& - ald -- - - - -------- -- ----- - ----- - ---- -------- - 27-i`�cc,� 10.Ord �efa`��r , e via,0r y - - -- F( �E CITY OF RENTON PLANNING/BUILDING/PUBLIC WORKS MEMORANDUM DATE: February 5, 1996 TO: Lawrence Vickers 13419 SE 141st Street Renton, WA 98059 - 5439 FROM: Daniel Carey 1 — SUBJECT: Maplewood Creek Fish Passage Channel and Sedimentation Basin Enclosed is the following information you requested on Tuesday February 7. • Project Narrative • Environmental Checklist (SEPA) • Project Description for Corps Permit Application (also for other permits) • Five 22" x 34" plan sheets submitted for SEPA application Please call me at (206) 277-6193 if you have any questions. c: LVICK207.DOC Page 1 F t_i/ CITY OF RENTON PLANNING/BUILDING/PUBLIC WORKS MEMORANDUM DATE: January 30, 1996 TO: Laureen Nicolay, Neil Watts FROM: Daniel Careyf SUBJECT: Environmental Review Submittal Maplewood Creek Flooding and Habitat Improvement Projects Please consider the following responses to the items on the Environmental Review and Shoreline submittal requirements highlighted by Jenny. I think our plans and reports contain the information needed for the environmental review, and that we do not need to produce additional reports and plans. Environmental Review Submittal 13. Grading Plan The plans for the sediment basin show the proposed new berm area (fill) and basin area (excavation). The proposed area for slope stabilization in the ravine is shown. The Site Plan shows the approximate location and design for the proposed low flow fish passage channel. The channel will be excavated to the typical cross sections shown on the Landscape Plan. The majority of excavated soil comes from the channel. The location and design of the channel is not expected to change appreciably from that shown on the plans. The plans should be sufficient for a grading plan. 15. Drainage Plan, 16. Drainage Report, Geotechnical Report The Sedimentation Basin Phase 1 Design Report contains a section on the flow analysis from the Maplewood Creek basin, based on 1989 draft report by Parametrix for the City (pp. 4,5). The report also discusses design flows for the low flow fish passage channel and sediment basin main spillway (pp. 11,12). The spillways are designed for the peak flow from the 100-year, 24-hour storm. There is a section on geology, soil testing, and predicted sediment basin efficiency (Appendix A). These items should be sufficient for the drainage plan and report, and geotechnical report. Shoreline Permit Submittal 7. Site Plan The streets nearest to the site are shown. I added the ordinary high-water mark for the Cedar River and the proposed high-water mark for the sediment basin. The high water mark for Maplewood Creek is essentially the creek itself. Page 1 The existing land contours around the sediment basin are shown on the basin's plan sheets. The land contours for the golf course were not available for the conceptual plans. However, the cross-sections on the Landscaping Plan show how the channel will be excavated on the golf course. The golf course is relatively flat, and other areas around the golf course will not be affected by the construction. The plans should be sufficient for a site plan. 9. Drainage Plan, 10. Drainage Report Same response as above 11. Landscaping Plan The existing slopes in the ravine next to the upper dam are unstable, and subject to erosion and stuffing. The City is addressing repair of the existing eroding slopes in the ravine in the Sedimentation Basin Phase 1 Design Report (pp. 13) and is the repair work is shown on plan sheet 1. Vegetation will be planted where appropriate. The plans comply with the intent of the City of Renton Section 4-31-34 Landscaping and should be accepted for review by the ERC. 17. Project Narrative The project narrative was revise and 11 new copies are included in the submittal material. Maplewood Creek, the Cedar River, the unnamed wetlands, and the soil along the banks are mentioned. The shoreline and the distance from the Cedar River are mentioned. The project narrative should be sufficient for the submittal, more detail is provided in the report. I would also note the conflicting instruction for the Project Narrative. The Environmental Review application states "The narrative should summarize and describe the proposed project". The Shoreline application states ". . . a project narrative describing the proposed project IN DETAIL . . .", and adds more items that must be addressed. These types of items are addressed in the project reports and the SEPA checklist. We should not have to repeat the same informatione over and over again. cc: Ron Straka Page 2 : � 1f.:.tl.::.................:......:::::::: ::.::.:::::::::::.:: ::.:::::::.::..:;;;:.;:.;:.;:.;:.;:.;:.;::.::.;:.;:.::::::::. UFMENT>:SERVfGES>:Dtul _..................................._.............:. .: :::..... tV '.1 1 :111... . ::::: :::::.. 1 . A. BACKGROUND 1. Name of proposed project, if applicable: Maplewood Creek Flooding and Habitat Improvement Projects 2. Name of applicant: City of Renton Surface Water Utility 3. Address and phone number of applicant and contact person: Daniel Carey, P.E. City of Renton Surface Water Utility 277-6193 4. Date Checklist prepared: 1/23/96 5. Agency requesting checklist: City of Renton Development Service Division 6. Proposed timing or schedule (including phasing, if applicable): The project includes two construction phases and one conceptual phase: • Phase 1 - Construction of a new low-flow fish passage channel for Maplewood Creek across the golf course • Phase 2 - Reconstruction of the existing sedimentation basin at the Maplewood Golf Course • Phase 3 - High flow capacity improvements to the existing channel of Maplewood Creek (conceptual) Phase 1 will construct a new low-flow fish passage channel across the golf course. The new channel will begin next to the existing sedimentation basin and old club house at the north side of the golf course. The channel will extend across the middle of the golf course to the southwest corner, where it will be connected to a fish ladder that goes under SR 169 to the Cedar River. The fish ladder was constructed in 1994 by WSDOT as part of the SR r 169 widening project, and in agreement with the Department of Fisheries and the City of Renton. Phase 2 will reconstruct the existing sedimentation basin at the north side of the parking lot next to the old club house. The new sedimentation basin will be extended about 70 feet south into the old parking lot and will be approximately three times the size of the existing basin. The new sedimentation basin will include a fishway outlet that will be connected to the new fish passage channel. The upper concrete dam, approximately 500 feet upstream of the existing basin, will be notched or removed to allow the creek to reestablish a natural flow. Unstable and eroding side slopes next to the construction areas will be stabilized. The construction area will be re- vegetated after the project is completed. Phase 3 is conceptual and would involve enlarging the existing channel for Maplewood Creek to be capably of carrying the peak flow from the 100-year, 24-hour storm event. The enlarged channel would probably consist of a trapezoidal cross section with grass vegetation similar to the surrounding golf course. The side slopes could range from 5 to 1 (horizontal to vertical) to 3 to 1, depending on the flow requirements and golf course needs. The Parks Department is currently performing major landscaping and other construction work to reshape existing Golf Course features. Work proposed as part of this project will be coordinated with the Parks Department in order to minimize disturbance to golf course operations and Maplewood Creek habitat features. Phase 1, construction of the new low flow channel, is proposed for April, and possibly May 1996, if necessary. Construction will try to be completed by May 1 st to reduce impacts to golf course use during the busier season. If construction does not occur in the spring it may be delayed to September and October 1996. Although construction would occur'in the "wet" season, precautions would be taken to avoid the release of turbidity into the Cedar River. During construction the new channel will not have any water from Maplewood Creek flowing in it. Erosion and sedimentation prevention best management practices (BMPs) would be used to control the creation and movement of turbidity from rainfall runoff. Sediment control features such as hay bales and filter fabric fences will be placed at the end of the channel to control sediment before runoff is discharged into the fish ladder under SR 169. Phase 2, reconstruction of the sedimentation basin, is proposed to begin after September 2,1996 (Labor Day) to reduce impacts to golf course use during the busier season. Construction may last through September and October. Approval will be needed from the Department of Fisheries to allow work in the creek after September 15. Fisheries has granted approval to work outside the fisheries construction window in similar cases. The Surface Water Utility and Parks Department will revise the construction schedule if approval for work after September 15th is not granted. Construction will probably start with removal of the upper concrete dam and slope stabilization repairs in that area. Reconstruction of the new sedimentation basin and adjacent bank erosion stabilization would then Lower Maplewood Creek Flooding and Habitat Improvements Page 2 H:DOCS:96-061:DWC:ps T x proceed. During construction, flow from Maplewood Creek will be diverted around the construction area and will be directed into the existing channel. After construction, flow from Maplewood Creek will be directed into the new low flow fish passage channel. Phase 3 is conceptual, and currently is not funded or scheduled for construction. It is included since improvements should be made to the existing channel to size it to carrying the predicted peak flow from the 100- year, 24-hour storm event for future conditions. See the attached Project Description for a more detailed explanation of the project. 7. Do you have any plans for future additions, expansions, or further activity related to or connected with this proposal? If yes, explain. Monitoring and maintenance activities only. Neither the sediment basin nor the low-flow channel are expected to require extensive repair or maintenance after construction. However, periodic sediment removal would be required from the sediment basin. Occasional sediment removal may be needed from the new channel. The amounts and frequency of sediment removal from the basin is directly dependent on the size and frequency of precipitation events in the area, and the erosion of soil in the upper canyon. Occasional slope failures in the canyon tend to cause abrupt increases in the amount of sediment carried to the basin. All sediment collected by the basin needs to be removed to maintain the sedimentation basin efficiency. On the average 600 cubic yards of sediment per year may be captured by the basin and need to be removed. In addition, because the pond would not be 100% efficient at capturing suspended sediments, some deposition of finer sediments in the downstream channel could occur and may require removal on an infrequent basis. It is difficult to predict when sediment removal would be required. However, to a maximum extent practicable, maintenance activities which require work within the stream would be scheduled within the summer resource protection construction window, and would occur with prior notification to the Washington Department of Fish and Wildlife and other affected agencies. 8. List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. The following-reports were prepared for this proposal for the Army Corps of Engineers Section 404 Permit and the JARPA Application, and are included with the SEPA Checklist: • Project Description - Maplewood Creek Flooding and Habitat Improvement Projects ( Harza Northwest Inc., December 1995 ) • Riparian and Instream Habitat Report - Maplewood Creek Fish Passage Channel Project ( Harza Northwest Inc., December 1995 ) • Wetland Delineation Report - Maplewood Creek Flooding and Habitat Improvement Projects ( Harza Northwest Inc., December 1995 ) Lower Maplewood Creek Flooding and Habitat Improvements Page 3 H:DOCS:96-061:DWC:ps • Maplewood Creek Sedimentation Basin Reconstruction and Improvement Project ( Harza Northwest Inc., November 1994 ) Existing flooding, erosion, sediment, and aquatic habitat conditions associated with the Maplewood Creek basin are discussed in detail in the Cedar River Current and Future Conditions Report (King County SWM, April 1993.) The projects that make up this proposal - the sediment pond reconstruction and low-flow channel - are recommendations of the Draft Cedar River Basin and Non-Point Action Plan (King County SWM, February 1995). (The anticipated environmental impacts associated with the Cedar River Basin Plan are discussed in a Draft Environmental Impact Statement (DEIS), also prepared by King County SWM, February 1995). An Environmental Assessment (EA) and Finding of No Significant Impact (FONSI), dated February 27, 1995, were prepared by the Federal Emergency Management Authority (FEMA - Region X) for the Maplewood Creek Sedimentation Basin Reconstruction. 9. Do you know whether applications are pending for governmental approvals of other proposals directly affecting the property covered by your proposal? If yes, explain. None known. 10. List any governmental approvals or permits that will be needed for your proposal, if known. City of Renton Shorelines Substantial Development Permit Washington Dept. of Fisheries and Wildlife Hydraulic Project Approval (HPA) Washington Dept. of Ecology Water Quality Certification Washington Dept. of Ecology Short Term Water Quality Modification U.S. Army Corps of Engineers Nationwide or Section 404 permit 11. Give brief, complete description of your proposal, including the proposed uses and the size of the project and site. There are several questions later in this checklist that ask you to describe certain aspects of your proposal. You do not need to repeat those answers on this page. The project includes two construction phases and one conceptual phase: • Phase 1 will construct a new low-flow fish passage channel across the golf course. The new channel will begin next to the existing v sedimentation basin and old club house at the north side of the golf course. The channel will extend across the middle of the golf course to the southwest corner, where it will be connected to a fish ladder that goes under SR 169 to the Cedar River. The new channel will be about 1850 feet long, 12 to 26 feet wide, and 4 feet deep. • Phase 2 will reconstruct the existing sedimentation basin at the north side of the parking lot next to the old club house. The new sedimentation basin will include a fishway outlet that will be Lower Maplewood Creek Flooding and Habitat Improvements Page 4 H:DOCS:96-061:DWC:ps connected to the new fish passage channel. In addition, the upper concrete dam approximately 500 feet upstream of the existing basin will be notched or removed to allow the creek to reestablish a natural flow. Unstable and eroding side slopes next to the construction areas will be stabilized by excavating unstable material and placing riprap and plantings. The new basin will be about 160 feet long, 90 to 150 feet wide, and 6 1/2 feet deep. • Phase 3 is conceptual and would involve enlarging the existing channel for Maplewood Creek to be capably of carrying the predicted peak flow from the 100-year, 24-hour storm event for future conditions. Phase 3 currently is not scheduled for construction, but is included since improvements should be made to the existing channel to carrying the 100-year peak flow. The existing channel is about 1 100 feet long. The enlarged channel would consist of a trapezoidal cross section 24 to 40 feet,wide with 5 to 1 (horizontal to vertical ) side slopes, and vegetation similar to the surrounding golf course. See the attached Project Description for additional information. 12. Location of the proposal. Give sufficient information for a person to understand the precise location of your proposed project, including a street address, if any, and section, township, and range if known. If a proposal would occur over a range of area, provide the range or boundaries of the site(s)• Provide a legal description, site plan, vicinity map, and topography map, if reasonably available. While you should submit any plans required by the agency, you are not required to duplicate maps or detailed plans submitted with any permit applications related to this checklist. The project is located on the western side and middle of the Maplewood Golf Course, north of SR 169. The sedimentation basin is located in the center part of the golf course, north of the parking lot for the old club house, about 1200 feet north of SR 169. The project is located within Sections 15, 21 and 22, Township 23 North, Range 5 East. See attached Project Description for additional information. B. ENVIRONMENTAL ELEMENTS 1. EARTH a. General description of the site (circle one): flat, rolling, hilly, steep slopes, mountainous, other b. What is the steepest slope on the site (approximate percent slope)? Slopes generally vary from 1 % to 10% on the golf course, where the majority of the construction for the low flow channel and new sedimentation basin would occur. Steep slopes, up to 70% grade, are located next to the existing sediment basin and upper concrete dam. Lower Maplewood Creek Flooding and Habitat Improvements Page 5 H:DOCS:96-061:DWC:ps C. What general types of soils are found on the site (for example, clay, sand, gravel, peat, muck)? If you know the classification of agricultural soils, specify them and note any prime farmland. Clay Sandy silt loam Sand Gravel, cobble d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. The slopes next to the upper dam are steep and subject to soil stuffing and potential failure. The sections next to the upper dam will be reinforced with riprap and vegetation to improve their stability. See attached project description for additional information. e. Describe the purpose, type, and approximate quantities of any filling or grading proposed. Indicate source of fill. Construction of the low-flow fish passage channel will involve excavating a new channel for Maplewood Creek across the golf course. About 8000 cubic yards (cy) of soil may be excavated. In some areas where channel excavation would not provide adequate freeboard, material from the channel excavation would be used to berm next to the channel to provide consistent channel depth. Excess soil may be stockpiled on the golf course and used for construction of the new sedimentation basin, for other landscaping purposes on the golf course, or taken to an off site disposal location by the contractor. Some clay material (1600 cy) may be imported to the site from commercial borrow pits and used beneath the channel to prevent losses of water from the stream into the underlying soil. About 400 cy of select gravel and cobbles will be imported to the site for the new channel bottom. Construction of the new sedimentation basin would require excavating about 3500 cy of soil to deepen and widen the pond. Some of the soil would be used to rebuild the berm which forms the new basin. Where necessary, off-site material to meet specific construction requirements will be imported from commercial borrow pits. Some imported fill and rock ( 200 cy) would also be required to stabilize the steep (> 70%) slopes which are adjacent to the upper concrete dam and existing sediment basin. Stabilization would be accomplished through over-excavation of the slope toe and replacement with imported quarry spalls, graded rock, and vegetation. Excess soil may be stockpiled on the golf course and used for other landscaping purposes on the golf course, or taken to an off site disposal location by the contractor. Lower Maplewood Creek Flooding and Habitat Improvements Page 6 H:DOCS:96-061:DWC:ps f. Could erosion occur as a result of clearing, construction, or use? If so, generally describe. This project is intended to reduce the amount of erosion and sediment deposition in Maplewood Creek and the Cedar River by constructing a new more efficient sedimentation basin, and stabilizing some steep slopes in the construction area. Precautions will be taken to ensure that turbidity would not be released to Maplewood Creek, and that neither Maplewood Creek nor the Cedar River will be adversely affected during construction. During construction, the new low flow channel would function as its own sediment pond. Excavation of the channel will begin at the downstream end, and rainfall runoff from the excavation will be allowed to settle and reduce its turbidity before discharge to the fish ladder. Sediment control features such as hay bales and silt fences will be used. Complete connection to the fish ladder would be accomplished after channel construction is completed, and will be "in the dry" with no water in the channel. Connection of the upper end of the low-flow channel would not occur until the new sediment basin construction is completed. Construction of the new sedimentation basin will probably start with removal of the upper concrete dam, accumulated sediment, and slope stabilization repairs in that area. The existing sediment basin would be kept in operation during this work. Reconstruction of the new sedimentation basin and bank erosion stabilization in that area would then proceed. During construction, flow from Maplewood Creek will be diverted around the construction area and will be directed into the existing channel. Silt fences, straw bales, and other BMPs would be used during construction to prevent material from eroding and discharging to Maplewood Creek. Re-vegetation of disturbed areas would occur as closely as possible to the completion of grading activities in the area. g. About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt or buildings)? The project will not add any new impervious area to the site. Existing impervious area will be reduced when part of the existing parking lot is used for the new sedimentation basin. h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any: Best management practices and other methods would be used during construction to control and prevent erosion. Silt fences, straw bales, and other BMPs would be used to prevent material from eroding and discharging to Maplewood Creek. The size of disturbed areas would be minimized and disturbed areas would be restored as soon as possible with vegetation. Lower Maplewood Creek Flooding and Habitat Improvements Page 7 H:DOCS:96-061:DWC:ps 2. AIR a. What types of emissions to the air would result from the proposal (i.e., dust, automobile, automobile, odors, industrial wood smoke) during construction and when the project is completed? If any, generally describe and give approximate quantities if known. During construction emissions from construction equipment (diesel- powered excavators and dump trucks) would be expected. No emissions are expected following construction as a result of this proposal. b. Are there any off-site sources of emission? No. C. Proposed measures to reduce or control emissions or other impacts to air, if any: The contractor would be required to provide properly functioning equipment meeting existing state and federal emissions guidelines. 3. WATER a. Surface: 1) Is there any surface water body on or in the immediate vicinity of the site (including year-round and seasonal streams, saltwater, lakes, ponds, wetlands)? If yes, describe type and provide names. If appropriate, state what stream or river it flows into. Yes, the upper concrete dam and sedimentation basin are within the Maplewood Creek channel. The low flow fish passage channel will be in the immediate vicinity of the fish ladder (currently dry) under SR 169, which is connected to the Cedar River. There are no wetlands mapped on the site in the National Wetlands Inventory map and the City of Renton Critical Areas Inventory. However, low quality wetlands vegetation was found along the waters edge of the upper concrete dam , the existing sedimentation basin, and the existing channel of Maplewood Creek across the golf course. The sedimentation basins and their associated wetlands do not meet the City of Renton definition for regulated wetlands because they are maintained as stormwater management facilities. Wetlands along the existing Maplewood Creek channel meet the City's definition of Category 3 wetlands because they have been disturbed by channelization, grading, excavation, and mowing. According to the City's Wetland Management Ordinance, buffer areas for a Category 3 wetland within an urban designation would usually include 25 feet on either side of a wetland. At this site, proposed construction and Lower Maplewood Creek Flooding and Habitat Improvements Page 8 H:DOCS:96-061:DWC:ps maintenance activities are similar to those currently used, and no impacts are expected. The wetland vegetation areas along the waters edge will be disturbed during construction. After construction, wetland vegetation will have the opportunity to re-vegetate the pond and stream banks, as it has now. In addition, the low flow fish passage channel will be longer than the existing channel and will have habitat planting along its sides. Overall, the area available for wetland vegetation will increase and the fish passage channel is expected to provide a higher quality area for wetland plants than the existing channel. About 0.42 acres of existing wetland area would be affected, but 1 .45 acres of new, higher quality, wetland area would be created by the projects. Under the City's Ordinance a ratio of 1.5:1 is typically required for Category 3 wetlands. The proposed low flow channel is designed to provide on-site mitigation at a ratio of 3:1 for all wetland impacts, including those associated with the sedimentation basins. Although some of the mitigation will be out-of-kind (i.e. palustrine scrub shrub instead of palustrine emergent vegetation), wetland functions and values are expected to be much higher than the wetlands that will be affected. All wetlands in the Project area will fall under the Corps of Engineers jurisdiction, and it is anticipated that the proposed mitigation will be adequate to meet Corps requirements. 2) Will the project require any work over, in, or adjacent to (within 200 feet) the described waters? If yes, please describe and attach available plans. Yes, removal of the upper concrete dam and construction of the new sediment basin will occur within the Maplewood Creek channel. The new low flow fish passage channel will be connected to the end of the WSDOT fish ladder, which is about 180 to 200 feet from the Cedar River. About the last 20 feet of the channel will be within 200 feet of the Cedar River. 3) Estimate the amount of fill and dredge material that would be placed in or removed from surface water or wetlands and indicate the area of the site that would be affected. Indicate the source of fill material. Construction of the low flow fish passage channel would involve v excavating up to 8,000 cy of soil. About 1,600 cy of clay and 400 cy of gravel and cobbles may be imported and placed. This work is located on the western side of the golf course, and would not occur in any existing surface water or wetland areas. Construction of the new sediment basin would involve excavating and placing approximately 7,000 cy of material in or around Maplewood Creek. About 1,000 cy of accumulated sediment would be excavated Lower Maplewood Creek Flooding and Habitat Improvements Page 9 H:DOCS:96-061:DWC:ps for work on the upper concrete dam, 250 cy of soil during side slope stabilization, and 3,500 cy of soil during work on the existing sediment basin. About 250 cy of material would be placed for slope stabilization, and 3,000 cy of material for the new sediment basin. Construction of the high flow channel would involve excavating approximately 3,000 cy of material in or around the existing channel for Maplewood Creek. Currently, this work is not scheduled for construction as part of the project. Specialized fill, such as quarry spalls, rock, gravel, and clay for an impervious layer would be imported to the site from commercial pits and sources. Some material excavated from the channel and existing sediment basin would be used as fill for the new sediment basin. Excess soil may be stockpiled on the golf course and used for other landscaping purposes on the golf course, or taken to an off site disposal location by the contractor. See the attached Project Description for additional information. 4) Will the proposal require surface water withdrawals or diversions? Give general description, purpose, and approximate quantities if known. Surface water will be diverted from the existing channel of Maplewood Creek to the new low flow fish passage channel. Following construction of the new sediment basin, Maplewood Creek baseflows ( 0 to 20 cfs) will be directed into the new low-flow fish passage channel, the WSDOT fish ladder, and to the Cedar River. The existing channel across the golf course ( high flow channel ) is planned to be dry. A valve will be installed in the sedimentation basin and It will be possible to keep a small base flow in the existing channel, if required. Flows in Maplewood Creek above 20 cfs will go to both the low flow channel and the high flow channel. The maximum design capacity of the low-flow channel is approximately 45 cfs. At that point the high flow channel would be taking about 347 cfs for a total of 392 cfs the peak runoff from the 100-year storm event►. It was estimated that the high flow channel would be used approximately 7 days per year on average, primarily during the winter high flow months. The private property owner on the golf course, located southeast of the existing sediment basin, has a Certification of Surface Water Right to use 0.03 cfs each year for domestic supply and fish propagation (permit no. 16023). Currently, the owner has a inlet in the existing sediment basin that supplies water to the property. The City will Lower Maplewood Creek Flooding and Habitat Improvements Page 10 H:DOCS:96-061:DWC:ps construct a new inlet in the new sediment basin to replace the existing inlet that will be removed during construction. 5) Does the proposal lie within a 100-year floodplain? If so, note location on the site plan. Most of the area that would be affected by the sediment pond reconstruction is in or adjacent to Maplewood Creek, and would be within the 100-year floodplain of the creek. The proposed low-flow channel would be constructed through upland area. The lower portion of the low flow channel is located within the 100-year flood plain for the Cedar River ( as mapped by FEMA). 6) Does the proposal involve any discharges of waste materials to surface waters? If so, describe the type of waste and anticipated volume of discharge. No. b. Ground: 1) Will ground water be withdrawn, or will water be discharged to ground water? Give general description, purpose, and approximate quantities if known. No. 2) Describe waste material that will be discharged into the ground from septic tanks or other sources, if any (for example: Domestic sewage; industrial, containing the following chemicals . . .; agricultural; etc.). Describe the general size of the system, the number of such systems, the number of houses to be served (if applicable), or the number of animals or humans the system(s) are expected to serve. N/A C. Water Runoff (including storm water): 1) Describe the source of runoff (including storm water) and method of collection and disposal, if any (include quantities, if known). Where will this water flow? Will this water flow into other waters? If so, describe. The majority of runoff to Maplewood Creek comes from the 1,032 acre drainage basin on the plateau above the golf course (to the north). Runoff flows from the plateau into Maplewood Creek, through the ravine, and onto the golf course. On the golf course the creek flows in a surface channel until it reaches SR 169. From SR 169 Maplewood Creek is conveyed in a WSDOT 72-inch pipe to discharge to the Cedar River. Lower Maplewood Creek Flooding and Habitat Improvements Page 11 H:DOCS:96-061:DWC:ps The golf course consists of about 67 acres. Runoff from the majority of the golf course is not collected by a drainage system. Most of the rainfall infiltrates the soil, and the remainder flows across the golf course in an unconcentrated form. Runoff from some areas can flow to the channel for Maplewood Creek, other areas flow off the golf course to adjacent property, or pond in low points on the golf course. The vast majority of water in the low flow fish passage channel will come from the Maplewood drainage basin on the plateau above the golf course. Rainfall runoff flowing across the golf course will be encouraged to infiltrate by providing a small 2 percent slope at the top of the fish passage channel. The golf course utilizes BMPs by following manufacturer's instructions, and State and Federal regulations for pesticide and fertilizer application. Runoff from the golf course is not expected to affect water quality in the channel. The new sediment basin will be constructed at the location of the existing basin and the old clubhouse parking lot. The new basin will not change existing runoff patterns. 2) Could waste materials enter ground or surface waters? If so, generally describe. a No. d. Proposed measures to reduce or control surface, ground, and runoff impacts, if any: N/A 4. PLANTS a. Check or circle types of vegetation found on the site: _X_ deciduous tree: alder, maple, aspen, other: cottonwood _X_ evergreen tree: fir, cedar, pine, other: _X_ Shrubs X grass crop or grain X Wet soil plants: cattail, buttercup, bullrush, skunk cabbage, other Some species observed include horsetail, giant horsetail, creeping buttercup, reed canary grass, soft rush, smart weed, brooklime, large- leaved avens, and Watson's willow herb. water plants: water lily, eel grass, milfoil, other other types of vegetation b. What kind and amount of vegetation will be removed or altered? Notching the upper concrete dam, slope stabilization, and construction of the new sedimentation basin will disturb the existing low quality wetland vegetation along the waters edge. Some upland vegetation (trees, shrubs, grasses, etc.) will also be disturbed by construction. Lower Maplewood Creek Flooding and Habitat Improvements Page 12 H:DOCS:96-061:DWC:ps Construction of the low-flow fish passage channel across the existing golf course will disturb golf course landscaping grasses, shrubs and trees. Some of the existing trees within the channel alignment may be removed, or relocated within the golf course during construction. As described in Section 3.a. above, the City's consultant has estimated that 0.42 acres of wetlands, predominantly along the edge of the existing creek channel and ponds, would be affected. The new construction will create about 1.45 acres of wetland area with higher values than currently exist. All area disturbed by construction will be re-vegetated. Wetland species are expected to reestablish themselves along the edge of the new basin and low flow channel. See the attached Wetland Delineation Report for more information. C. List threatened or endangered species known to be on or near the site. There are no threatened or endangered species known to be on or near the site. d. Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site, if any: In keeping with the goals of the City's Wetland Management Ordinance, native plant species would be used in the landscaping within the low-flow fish passage channel and in the areas bordering the reconstructed sediment pond. Native vegetation that is compatible with the golf-course environment would be used within the channel to create salmon habitat. Native plant species would also be used around the pond to help stabilize disturbed areas and adjacent unstable slopes. See the attached Project Description for more information. 5. ANIMALS a. Circle any birds and animals which have been observed on or near the site or are known to be on or near the site: Birds: Hawks, heron, eagle, songbirds, other: Mammals: Deer, bear, elk, beaver, other: raccoon Fish: bass, salmon, trout, herring, shellfish, other b. List any threatened or endangered species known to be on or near the site. There are no threatened or endangered species known to be on or near the site. C. Is the site part of a migration route? If so, explain. The Cedar River is a major salmon migration waterway. Although a few salmon have been spotted in Maplewood Creek on the golf course Lower Maplewood Creek Flooding and Habitat Improvements Page 13 H:DOCS:96-061:DW C:ps over the last several years, the creek is not extensively used by salmon or any other species. Migration from the Cedar River to Maplewood Creek is inhibited by the WSDOT 900+ foot long culvert from the Cedar River to the open channel of Maplewood Creek on the golf course. Fish migration upstream of the golf course is currently blocked by the existing sediment pond and old water supply concrete dam. One of the objectives of the project is to re-establish salmon migration to existing habitat areas in the canyon above the golf course. The low flow fish passage channel will be connected to the new fish ladder under SR 169, and to the Cedar River. The low flow channel and new sediment basin would allow migrating salmon in the Cedar River to have easier access to Maplewood Creek and the canyon above the golf course. d. Proposed measures to preserve or enhance wildlife, if any: The project would reestablish the opportunity salmon to migrate in Maplewood Creek to habitat areas above the golf course. In addition, habitat availability within the golf course would be improved through reconstruction of the channel in a manner that provides an increase in substantial vegetation and cover, and potential habitat area. Habitat areas created on the golf course will be done in a manner to balance with the needs of golf course operation. See the attached Project Description for more information. 6. ENERGY AND NATURAL RESOURCES a. What kinds of energy (electric, natural gas, oil, wood stove, solar) will be used to meet the completed project's energy needs? Describe whether it will be used for heating, manufacturing, etc. N/A b. Would your project affect the potential use of solar energy by adjacent properties? If so, generally describe. No C. What kinds of energy conservation features are included in the plans of this proposal? List other proposed measures to reduce or control energy impacts, if any: " N/A 7. ENVIRONMENTAL HEALTH a. Are there any environmental health hazards, including exposure to toxic chemicals, risk of fire and explosion, spill, or hazardous waste, that could occur as a result of this proposal? If so, describe. Lower Maplewood Creek Flooding and Habitat Improvements Page 14 H:DOCS:96-061:DWC:ps The completed project will not create any environmental health hazards. During construction fuel and oil spills could occur. 1) Describe special emergency services that might be required. Typical emergency services provided by the Fire Department in case of fire, injury, or fuel spills. 2) Proposed measures to reduce or control environmental health hazards, if any: The contractor will be required to keep construction equipment in good operating condition, and will be responsible for cleaning up any fuel or oil spills. b. Noise 1) What types of noise exist in the area which may affect your project (for example: traffic, equipment, operation, other)? None. 2) What types and levels of noise would be created by or associated with the project on a short-term or a long-term basis (for example: traffic, construction, operation, other)? Indicate what hours noise would come from the site. Short term low level noise during construction will occur. 3) Proposed measures to reduce or control noise impacts, if any: The contractor will be required to have mufflers and exhaust systems in good operating condition. Hours of construction would comply with the City Noise Ordinance. 8. LAND AND SHORELINE USE a. What is the current use of the site and adjacent properties? The site is currently used as a municipal golf course. Adjacent properties are wooded slopes, state highway SR 169, and single family residences. b. Has the site been used for agriculture? If so, describe. In the past the site was used for agriculture. Before the golf course was constructed the upper concrete dam was originally constructed to supply orchards on the site with water from Maplewood Creek. C. Describe any structures on the site. The site contains the old golf course club house and parking lot, the new club house and associated buildings, golf course maintenance Lower Maplewood Creek Flooding and Habitat Improvements Page 15 H:DOCS:96-061:DWC:ps buildings, the new City pump station and water supply wells, the upper concrete dam, and the existing sediment basin. d. Will any structures be demolished? If so, what? Yes. The upper concrete dam will be notched and partially or completely removed. The existing sediment basin will be removed. The old clubhouse patio and part of the old parking lot will be removed. e. What is the current zoning classification of the site? P-1, public use f. What is the current comprehensive plan designation of the site? Rural residential. g. If applicable, what is the current shoreline master program designation of the site? The site is located within an area designated for urban use. h. Has any part of the site been classified as an "environmentally sensitive" area? If so, specify. No. i. Approximately how many people would reside or work in the completed project? N/A j. Approximately how many people would the completed project displace? None k. Proposed measures to avoid or reduce displacement impacts, if any: N/A I. Proposed measures to ensure the proposal is compatible with existing and projected land uses and plans, if any: This project has been undertaken as a result of discussions with WSDOT and WDF&W concerning the SR 169 widening project by WSDOT (constructed in 1993-94). The project is also a recommendation of the Draft Cedar River Basin Plan (King County Surface Water Management Division, 1995)• Consultation with fishery and other resource agencies, including WDF&W, USFWS, NMFS, COE, and the Muckleshoot Indian Tribe will Lower Maplewood Creek Flooding and Habitat Improvements Page 16 H:DOCS:96-061:DWC:ps be undertaken to ensure compatibility with goals for the Cedar River system. 9. HOUSING a. Approximately how many units would be provided, if any? Indicate whether high, middle, or low-income housing. N/A b. Approximately how many units, if any, would be eliminated? Indicate whether high, middle, or low-income housing. N/A C. Proposed measures to reduce or control housing impacts, if any: N/A 10. AESTHETICS a. What is the tallest height of any proposed structure(s), not including antennas; what is the principal exterior building material(s) proposed? The berm that would be constructed at the downstream end of the sedimentation basin will be approximately 8 feet above the existing parking lot. The berm would be constructed of earthen materials with an impervious core, and will be vegetated with grass. b. What views in the immediate vicinity would be altered or obstructed? No views will be altered. C. Proposed measures to reduce or control aesthetic impacts, if any: The project will enhance the aesthetic nature of the area by routing the stream channel through the golf course, using native vegetation where possible in a manner compatible with the golf course use, providing improved salmon habitat, and improving the stability of eroding slopes adjacent to the upper concrete dam and existing sediment pond. 11. LIGHT AND GLARE a. What type of light or glare will the proposal produce? What time of day would it mainly occur? None. b. Could light or glare from the finished project be a safety hazard or interfere with views? No. Lower Maplewood Creek Flooding and Habitat Improvements Page 17 H:DOCS:96-061:DWC:ps C. What existing off-site sources of light or glare may affect your proposal? None. d. Proposed measures to reduce or control light and glare impacts, if any: NA 12. RECREATION a. What designated and informal recreational opportunities are in the immediate vicinity? Golfing on the Maplewood Golf Course. b. Would the proposed project displace any existing recreational uses? If so, describe. No. C. Proposed measures to reduce or control impacts on recreation, including recreation opportunities to be provided by the project or applicant, if any: No adverse impacts to recreational opportunity are anticipated to occur as a result of this proposal. The project may expand recreational opportunities through the improvement of fisheries habitat and/or the provision of interpretive signage. 13. HISTORIC AND CULTURAL PRESERVATION a. Are there any places or objects listed on, or proposed for, national, state, or local preservation registers known to be on or next to the site? If so, generally describe. There are no places or objects listed on, or proposed for national, state or local preservation registers known to be on the site. b. Generally describe any landmarks or evidence of historic, archaeological, scientific, or cultural importance known to be on or next to the site. None known. G. Proposed measures to reduce or control impacts, if any: In the event that any landmarks or evidence of historic, archaeological, scientific, or cultural importance are discovered, construction will be stopped and the State Historical Preservation officer will be consulted. Lower Maplewood Creek Flooding and Habitat Improvements Page 18 H:DOCS:96-061:DWC:ps A, 14. TRANSPORTATION a. Identify public streets and highways serving the site, and describe proposed access to the existing street system. Show on site plans, if any: The site is accessed by SR 169, and the golf course entrance and maintenance roads. There will not be public access to the project area since it would conflict with golf course use. b. Is site currently served by public transit? If not, what is the approximate distance to the nearest transit stop? No. C. How many parking spaces would the completed project have? How many would the project eliminate? The project will not require any parking spaces. About 8,000 square feet of the old parking lot will be eliminated by construction of the new sediment basin. The parking lot is only used for overflow and special event parking since the new club house and parking lot has opened. d. Will the proposal require any new roads or streets, or improvements to existing roads or streets, not including driveways? If so generally describe (indicate whether public or private). The existing access road on the west side of Maplewood Creek, from the existing sediment basin to the upper concrete dam, will be improved by grading and resurfacing with gravel. e. Will the project use (or occur in the immediate vicinity oft water, rail, or air transportation? If so„generally describe. No. f. How many vehicular trips per day would be generated by the completed project? If known, indicate when peak volumes would occur. None. g. Proposed measures to reduce or control transportation impacts, if any: NA 15. PUBLIC SERVICES a. Would the project result in an increased need for public services (for example: fire protection, police protection, health care, schools, other)? If so, generally describe. There would not be an increased need for public services. Lower Maplewood Creek Flooding and Habitat Improvements Page 19 H:DOCS:96-061:DWC:ps 1 b. Proposed measures to reduce or control direct impacts on public services, if any. N/A 16. UTILITIES a. Circle utilities currently available at the site: natural gas, water, refuse service, telephone, sanitary sewer, septic system, electricity, other Water, sanitary sewer, electricity. b. Describe the utilities that are proposed for the project, the utility providing the service, and the general construction activities on the site or in the immediate vicinity which might be needed. None. C. SIGNATURE I, the undersigned, state that to the best of my knowledge the above information is true and complete. It is understood that the lead agency may withdraw any declaration of non-significance that it might issue in reliance upon this checklist should there by any willful misrepresentation or willful lack of full disclosure on my part. Proponent: Name Printed: Da n is l C a revU/ar Date: H:DOCS:96-061:DWC:ps Lower Maplewood Creek Flooding and Habitat Improvements Page 20 H:DOCS:96-061:DWC:ps j(L-' INTERFUND TRANSFER Transfer Number: Date:_f General Descry tion: ,Shu��n r, SPdPirt�r�-tzvfi�rl l��<;ra - Department To Be Charged (Transfer Out - From) Description Account Number WO/Function Amount o H2I . 5q 60 039 si✓� E Pr 24.v�eu� Department Authorization: Department To Be Credited (Transfer In - To) cWzlleec Description Account Number WO/Function Amount &I�e L 00C),00 t, 12- Distribution: White: Finance Department Yellow: Department to be Charged Pink: Department to be Credited { Arnends: ORD 4322 CITY OF RENTON, WASHINGTON ORDINANCE NO. 4491 AN ORDINANCE OF THE CITY OF RENTON, WASHINGTON, AMENDING SECTION 5-1-1 .A, OF CHAPTER 1, FEE SCHEDULE, OF TITLE V (FINANCE AND BUSINESS REGULATIONS) OF ORDINANCE NO. 4260 ENTITLE "CODE OF GENERAL ORDINANCE OF THE CITY OF RENTON, WASHINGTON" , BY ADOPTING A NEW FEE SCHEDULE. THE CITY COUNCIL OF THE CITY OF RENTON, WASHINGTON, DO ORDAIN AS FOLLOWS : SECTION I . Section 5-1-1 .A of Chapter 1 , Fee Schedule, of Title V (Finance and Business Regulations ) , of Ordinance No. 4260 entitled "Code of General Ordinances of the City of Renton, Washington" is hereby amended to read as follows : A. PLANNING AND DEVELOPMENT 1 . APPLICATION FEES a. Appeal of Hearing Examiner ' s Decision or Administrative or Environmental Decisions $75 b. Waiver $100 C . Lot Line Adjustment $450 d. Shoreline Filing Fee 1 . Under $100, 000 value 500 2 . $100 , 000 or more value $1, 000 e . Routine Vegetation Management Permits $75— f . Rezone 1 . Less than 10 acres $2 , 000 2 . 10 to 20 acres $3, 000 3 . More than 20 acres $4 , 000 g. Temporary Permit $ 100 h . Special Permit $2 ;000 i . Comprehensive Plan Amendment $1 , 000 j . Variance $500 k. Plats 1 . Short Plat $1 , 000 2 . Preliminary Plat $2 , 000 3 . Final Plat $1 , 000 1 . Environmental Impact Statement/Draft and Final 100% Costs of cou-r-d:',_.___ ion, review, and appeals ORDINANCE NO. 4491 M. Mobile Home Parks 1 . Tentative $500 2 . Preliminary $2 , 000 3 . Final $1 , 000 n . Environmental Checklist 1 . Less than $100, 000 project value $40 2 . $100, 000 or more project value - _.. . 3 . Environmental Review/sensitive lands or $1, 0 , lands covered by water, except minor residential additions or modifications o . Binding Site Plan Approval $1 , 000 P. Grading and Filling Permits $2 , 000 q. Conditional Use Permit 1 . Hearing Examiner review $2 , 000 2 . Administrative review $1 , 000 r. Site Plan Approval 1 . Hearing Examiner review $2 , 000 2 . Administrative review $1 , 000 S . Planned Unit Development 1 . Tentative Plan $500 2 . Preliminary Plan $2 , 000 3 . Final Plan $1, 000 -- t . Annexation Expenses for Postag 2 . For joint land use application, applicant shall pay full fee for the most expensive (major) application and one-half for related applications . 3 . Extra Fees . Whenever any application is to be handled under the terms of any portion of the city ' s land use codes, adopted codes, or the Uniform Building Code, and that application is so large, complicated or technically complex that it cannot be handled with existing city staff, then an additional fee can be charged which is equivalent to the extra costs incurred by the City of Renton to pay: a . overtime costs, b. the pro-rata costs of additional employees necessary to handle the application, C . the costs expended to retain the qualified consultants to handle the project, and d. any general administrative costs when directly attributable to the project . Such fees shall be charged only to the extent incurred beyond that normally incurred for processing an application . When the application or development plans are modified so as to require additional review by the City beyond the review normally required for like projects , at the discretion of the Development Services Director, an additional fee may be charged at $75 . 00 per hour . 2 ORDINANCE NO. 4491 4 . Fees charged per the Uniform Building Code, Uniform Plumbing Code, Uniform Mechanical Code, and related separate codes shall be available for enforcement of those regulations , and are separate from the provisions in this ordinance . 5 . Refunds . 80% of the applicable fee will be refunded if the application is withdrawn prior to circulation by the Planning Staff . After circulation (and review has begun) no refund of base fees will be authorized. SECTION II . This Ordinance shall be effective upon its passage, approval, and thirty days after its publication . PASSED BY THE CITY COUNCIL this 19th day of December , 1994 . MarilynO&I etersen, City Clerk APPROVED BY THE MAYOR this 19th day of December , 1994 . Richard M. Stredicke, Mayor pro tem Approved as to form: La ence J. War , City Attorney Date of Publication: December 23 , 1994 ORD. 404 : 12/02/94 :as . 3 'EIL� NOTICE OF PROPOSED SHORELINE SUBSTANTIAL DEVELOPMENT PERMIT AND ENVIRONMENTAL APPLICATION RENTON, WASHINGTON A Shoreline Substantial Development Permit (SM) and Environmental Checklist Review (ECF) Application has been filed and accepted with the Development Services Division of the City of Renton. The following briefly describes the application and the necessary Public Approvals. PROJECT NAME/NUMBER: MAPLEWOOD FISH CHANNEL/LUA-96-009,SM,ECF DESCRIPTION: The City proposes to construct a low flow fish channel across the golf course and a sedimentation pond. GENERAL LOCATION: 4050 Maple Valley Highway/Maplewood Golf Course PUBLIC APPROVALS: Environmental Review Shoreline Substantial Development Permit The application can be reviewed in the Development Services Division located on the third floor of Renton City Hall. Comments will be accepted anytime prior to Public Hearifgs, during Public Hearings, or prior to an administrative site plan approval. For further information on the application, or if you wish to be made a PARTY OF RECORD and receive additional notifications, by mail, of the City's environmental determinations, appeal periods and/or the public hearing date(s) for this project, please contact the Development Services Division at 235-2550. Please include the project NUMBER when calling for proper file identification. a� zoo Maplewood Creek �. .. p, Upper Dam / Il. Existing Sedimentation Basin(RMOA) U II • •Project Site +<l co �``�'�°�� l ��1' _ • ..•:e'en 7r� hydy � t� _•'l��_ h Neighborhood Detail Map SCALE: 1 Inch=1000 Feet North Maplewood Creek Flooding and o f000 Habitat Improvement Projects City of Renton Source:U.S.G.S.Renton Quad Surface Water Utility D.Carey 1196 GENMALOT.DOC 01, l� ' Maplewood Creek .....•,•• ••• Upper Dam • Existing Sedimentation ••- //'. : ' Basin (RM 0.4) O II - • 411 wd Neighborhood Detail Map SCALE: 1 Inch = 1000 Feet North Maplewood Creek Flooding and o 1000 Habitat Improvement Projects City of Renton Source: U.S.G.S. Renton Quad. Surface Water Utility D. Carey 1/96 ;w PROJECT NAME: Maplewood Creek Flooding and Habitat Improvement Projects APPLICATION NO: The following is a list of property owners within 300 feet of the subject site. The Development Services Division will notify these individuals of the proposed development. Name Address Assessor's Parcel Number See Attached List LISTOWN.DOG t (Continued) NAME ADDRESS ASSESSOR'S PARCEL NUMBER Applicant Certification I, Da h i C Carey , hereby certify that the above list(s) of adjacent property (Print Name) owners and their addresses were obtained from: h� City of Renton Technical Services Records ❑ Title Company Records ❑ King County Assessors Records Signed Date V 1OI q 6 Sur ,re G✓�N� ak'y, pplicant) NOTARY ATTESTED: Subscribed and sworn before me, a Notary Public, in and for the State of Washington, residing at ,5f- - i-r� on the IQ_day of , 19RG . Signed y (Notary Pu ic) i :::::.�.�v:::.;•.K::.:.:-:. is Y.:�::::::::• � --.-:..: "4'a:i.l-;•:..>:i::3:;:i+:i::;:i:::i:.;:t;;:>::::>r:•r.C:::r:?;2�:;:;:::?:;:,x2.:;'-::::�x.:f::o R n e one tv t s :.....:::.,:::: »: ...:.::CERTIFI ATI N :.::..:::::::::. .....:.:........................:.:�.:.:�:.:::..:......._...... . C....:. ;>:�::::::::::::::._. I, , [tereby certify that notices of the proposed application were mailed to eaq 'Isted_. ro e.:. owner ort .::::�::<;'�.•�:::r:•.:::::>:r->'::�:-::eta;:::.::->:;;t;;:::;::n:..-J.....:::%':::%'<'[::`::;::::::;>:::+[:f«:.` � .:....:. ..:::....�....... -... :.- .... .:.:.. ..:..:: g ed ATTEST Subscribed and sworn before me a Notary Pu61ic, m and for the State of Washington residing at bn the day of 19 Y Signed :;.: � ;; ustprop.doc REV 07/95 2 CITY OF RENTON DEVELOPMENT SERVICES DIVISION LIST OF SURROUNDING PROPERTY OWNERS within 300 feet of the subject site PROJECT NAME: Maplewood Creek Flooding and Habitat Improvement Projects APPLICATION NO: The following is a list of property owners within 300 feet of the subject site. The Development Services Division will notify these individuals of the proposed development. Name Address Assessor's Parcel Number See Attached List LISTOWN.DOG Maplewood Creek Flooding and Habitat Improvement Projects Page 1 of 6 Property Owners within 300 Feet" Name Address Assessor's Parcel Number NIGRO BERT A 995 SHELTON AVE SE 1134000060 RENTON WA 98055 PACIFIC REAL ESTATE MORTG. 767 NORTH E STREET 1134000070 SAN BERNARDINO CA 92403 WHITLEY LEE 969 SHELTON AVE SE 1134000080 RENTON WA 98055 BOWDEN EDWARD 3939 SE IOTH PL 1134000120 RENTON WA 98055 SCHREINER RICHARD 3949 SE LOTH PL 1134000130 RENTON WA 98055 HUBBARD DOUGLAS+TRACY 12009 79TH AVE SO 1134000140 SEATTLE WA 98178 STUDTS PAUL R 3932 SE IOTH PL 1134000150 RENTON WA 98055 EDMONDS B L 1008 SHELTON AVE SE 1134000160 RENTON WA 98055 COLIS DOROTHY V 1004 SHELTON AVE SE 1134000170 RENTON WA 98055 WAFFLE ORMAL 1000 SHELTON AVE SE 1134000180 JACK+HENRIETTA RENTON WA 98058 MCCARTY BEULAH E 4012 MAPLE VALLEY HWY 1523059088 RENTON WA 98055 CITY OF RENTON PARKS 1523059169 200 MILL AVE S RENTON WA 98055 ARCHER FLOYD H 2103142ND SE 1523059187 BOTHELL WA 98011 KING COUNTY 500A K C ADMIN BLDG 1623059003 500 FOURTH SEATTLE WA 98104 CITY OF RENTON FINANCE 1623059018 200 MILL AVE S RENTON WA 98055 WEST COAST MGMT INC SUNNYDALE MOBILE HOME PARK 1623059022 5339 PROSPECT RD#261 SAN JOSE CA 95129 SEGALE M A INC PO BOX 88050 1623059048 TUKWILA WA 98138 MAP_PID.DOG Maplewood Creek Flooding and Habitat Improvement Projects Page 2 of 6 Property Owners within 300 Feet Name Address Assessor's Parcel Number CITY OF RENTON PARKS 1623059065 200 MILL AVE S RENTON WA 98055 CITY OF RENTON FINANCE 1623059126 200 MILL AVE S RENTON WA 98055 DAVIS EDITH C 14808 131ST AVE SE 2223059037 RENTON WA 98058 MORRIS NANCY LEE 12402 NE 149TH ST 2223059038 WOODINVILLE WA 98072 MAPLEWOOD ADD WATER COOP 15002 135 AVE SE 2223059040 RENTON WA 98055 JOHNSON H ALAN+MARILYN F 13505 MAPLE VALLEY HWY 2223059041 RENTON WA 98058 COOKE CHARLES L+JEANNE C 34504 38TH AVE S 2223059048 AUBURN WA 98001 COOKE CHARLES L+JEANNE C 34504 38TH AVE S 2223059048 AUBURN WA 98001 HIERONIMUS MARSHALL 832 BROOKSTONE DR 2223059053 MERRITT ISLAND FL 32952 PERRY GEORGE M 13205 SE MAPLE VALLEY HIWAY 2223059065 RENTON WA 98055 CHARBONEAU PHILIP 14636 SE JONES PL 2223059069 RENTON WA 98055 CHARBONEAU PHILIP 14636 SE JONES PL 2223059069 RENTON WA 98055 IHNE RICHARD S 13111 SE RENTON MAPLE VLY HWY 2223059070 RENTON WA 98055 HALL DIANA L 13110 SE 149TH ST 2223059071 RENTON WA 98058 SCHAFER PETER 13134 SE 149TH ST 2223059076 RENTON WA 98058 LORENZ FRED &ADDIE 14900 135TH SE 2223059079 RENTON WA 98055 SHANE ROBERT S II 13103 SE MAPLE VALLEY HWY 2223059081 RENTON WA 98055 HIEGEL DAVID A 13316 SE 149TH ST 2223059085 RENTON WA 98058 MAP_PID.DOG Maplewood Creek Flooding and Habitat Improvement Projects Page 3 of 6 Property Owners within 300.Feet Name Address Assessor's Parcel Number SCHRAM R T 13321 MAPLE VALLEY HWY 2223059088 RENTON WA 98058 MCCARTY BEULAH E 4012 MAPLE VALLEY HWY 2223059090 RENTON WA 98055 WHITWORTH ARLENE PO BOX 219 2223059106 FALL CITY WA 98024 BAXTER KENNETH R+VALERIE A 13307 SE RENTON-MAPLE VALLEY 2223059113 HWY RENTON WA 98058 BAXTER KENNETH R+VALERIE A 13307 SE RENTON-MAPLE VALLEY 2223059113 HWY RENTON WA 98058 PERRY,GEORGE M 13205 SE MPL VLY HWY 2223059136 RENTON WA 98055 PERRY, GEORGE M 13205 SE MPL VLY HWY 2223059136 RENTON WA 98055 CITY OF RENTON BENNETT W E 2223059140 200 MILL AVE S RENTON WA 98055 DE RYCKE ROBERT L+SOCORRO C 13223 SE RENTON MAPLE VALLEY RD 2223059150 RENTON WA 98058 JONES MICHAEL S 3604 SE 5TH ST 5126900260 RENTON WA 98055 FEYEREISEN DOUGLAS L+PATTY 3612 SE 5TH ST 5126900265 RENTON WA 98058 ROHDE KAREN ANN 3616 SE 5TH AVE 5126900270 RENTON WA 98058 JACKSON JENNIFER L 3620 SE 5TH ST 5126900275 RENTON WA 98058 RHODES A M 3624 SE 5TH ST 5126900280 RENTON WA 98055 LAPLANT LILA A LAPLANT JACK K 5126900330 7521 72ND DR NE MARYSVILLE WA 98270 DOAN E C 524 PIERCE AVE SE 5126900335 RENTON WA 98055 BRANDEL KURTIS P&BILLIE D 1602 INDEX AVE SE 5126900340 RENTON WA 98058 MAP_PID.DOG Maplewood Creek Flooding and Habitat Improvement Projects Page 4 of 6 Property Owners within 300 Feet Name Address Assessor's Parcel Number DOBSON JOHN W 6611 114TH AVE SE 5126900345 BELLEVUE WA 98006 OBRIEN BOBBI L 3620 SE 5TH PL 5126900350 RENTON WA 98056 VAN KEULEN JEFFERY D+ 3624 SE 5TH PL 5126900355 DAWN M RENTON WA 98055 COBLENTZ BETTY&MIKE 22320 88TH AVE S 5126900360 KENT WA 98031 MACGREGOR DONALD W 3621 SE 5TH ST 5126900365 RENTON WA 98055 BISHOP EILEEN M+TIMOTHY A 3629 SE 5TH ST 5126900370 RENTON WA 98058 CAMERON JEFFREY R 3600 SE 6TH STREET 5126900385 RENTON WA 98056 FRANKLIN B &PIEDFORT D L 3608 SE 6TH ST 5126900390 RENTON WA 98055 MILLS DAVID T 3616 SE 6TH ST 5126900395 RENTON WA 98058 PERRIGO PAUL R 3624 SE 6TH ST 5126900400 RENTON WA 98058 DOBSON JOHN W 6611 114TH AVE SE 5126900405 BELLEVUE WA 98006 SEAQUIST JOHN H 111 SW VICTORIA ST 5126900410 RENTON WA 98055 BLUHM CHRISTOPHER P+ 3609 SE 5TH PL 5126900415 WENDY L RENTON WA 98058 SWIFT WINNIFRED 3613 SE 5TH PL 5126900420 RENTON WA 98058 GATHMANN RICHARD JAMES 3621 SE 5TH PLACE 5126900425 RENTON WA 98058 HEHR GREGORY E 3625 SE 5TH PL 5126900430 RENTON WA 98058 HORVATH DOUGLAS R 512 NE 71ST 5126900435 SEATTLE WA 0 MANNING CINDY L 3605 SE 6TH ST 5126900475 RENTON WA 98058 SCHAFER SCOTT C &RONDA L 3609 SE 6TH ST 5126900480 RENTON WA 98055 MAP_PID.DOG Maplewood Creek Flooding and Habitat Improvement Projects Page 5 of 6 Property Owners within 300 Feet Name Address Assessor's Parcel Number PORTER JOSEPHR4E V 3613 SE 6TH ST 5126900485 RENTON WA 98055 LEPLEY YOLANDA 19826 97TH AVE S 5126900485 RENTON WA 98055 HAGADORN GRANT 3617 SE 6TH ST 5126900490 RENTON WA 98055 ANDERSON ELDON E+JO ANN 3701 SE 6TH ST 5126900495 RENTON WA 98055 DEFORREST STEVEN E+ELAINE D 3705 SE 6TH ST 5126900500 RENTON WA 98057 DEHAVILAND ALFRED ALAN 13433 SE 141ST ST 5127000180 RENTON WA 98056 DEHAVILAND ALFRED ALAN 13433 SE 141ST ST 5127000190 RENTON WA 98056 VICKERS LAWRENCE 13419 SE 141ST 5127000200 RENTON WA 98055 YAMAMOTO DAVID M 13420 SE 141ST 5127000210 RENTON WA 98055 PAYNE RANDALL D+ET AL 13434 SE 141ST ST 5127000220 RENTON WA 98059 PAYNE RANDALL D+ET AL 13434 SE 141ST ST 5127000230 RENTON WA 98059 CAMPBELL BETH J 4037 SE 11TH ST 5128000045 RENTON WA 98055 HUGHES MICHAEL A+SANDRA S 14803 130TH AVE SE 5128000050 RENTON WA 98058 STEINMETZER EARL R+SYLVIA M 14809 131ST AVE SE 5128000110 RENTON WA 98055 KAISERSHOT KELLY J 14804 130TH AVE SE 5128000115 RENTON WA 98058 SMITH RICKIE A+CAROL L 4012 SOUTHEAST 11TH STREET 6689400005 RENTON WA 98058 KARTES DAVID A+ANITA J PO BOX 157 6689400010 EASTON WA 98925 QUIRIT ALEX Y+KATHRYN K 3926 SE 11TH 6689400015 RENTON WA 98055 CAMPBELL BETH J 4037 SE 11TH ST 6689400045 RENTON WA 98055 MAP PID.DOG Maplewood Creek Flooding and Habitat Improvement Projects Page 6 of 6 Property Owners within 300 Feet Name Address Assessor's Parcel Number CAMPBELL BETH J 4037 SE 11TH ST 6689400050 RENTON WA 98055 VOGEL AMY 4033 SE 11TH ST 6689400055 RENTON WA 98058 KIDD LEONARD ALAN 13221 SE 151ST ST 9189700050 RENTON WA 98058 WASHINGTON DEPT. OF TRAN. PO BOX 47300 SR 169 ATTN: REAL ESTATE SERVICES OLYMPIA,WA 98504 LIZ MENZEL,PRESIDENT 13803 SE 144TH ST. COMMON MAPLEWOOD HET GHTS, Renton,WA 98059 PROPERTY HOMEOWNERS ASSOCIATION TYPE II MAP_M.DOG 1134000050 1134000060 1134000070 JOHNSON DAVID L NIGRO BERT A PACIFIC REAL ESTATE MORTG. 1001 SHELTON AVE SE 995 SHELTON AVE SE 767 NORTH E STREET RENTON WA 98058 RENTON WA 98055 SAN BERNARDINO CA 92403 1134000080 1134000120 1134000130 WHITLEY LEE BOWDEN EDWARD SCHREINER RICHARD 969 SHELTON AVE SE 3939 SE LOTH PL 3949 SE IOTH PL RENTON WA 98055 RENTON WA 98055 RENTON WA 98055 1134000140 1134000150 1134000160 HUBBARD DOUGLAS+TRACY STUDTS PAUL R EDMONDS B L 12009 79TH AVE SO 3932 SE LOTH PL 1008 SHELTON AVE SE SEATTLE WA 98178 RENTON WA 98055 RENTON WA 98055 1134000170 1134000180 1523059088 COLIS DOROTHY V WAFFLE ORMAL JACK+HENRIETTA MCCARTY BEULAH E 1004 SHELTON AVE SE 1000 SHELTON AVE SE 4012 MAPLE VALLEY HWY RENTON WA 98055 RENTON WA 98058 RENTON WA 98055 1523059169 1523059187 1623059003 CITY OF RENTON ARCHER FLOYD H KING COUNTY PARKS 21031 42ND SE 500A K C ADMIN BLDG 200 MILL AVE S BOTHELL WA 98011 500 FOURTH RENTON WA 98055 SEATTLE WA 98104 1623059018 1623059022 1623059048 CITY OF RENTON WEST COAST MGMT INC SEGALE M A INC FINANCE SUNNYDALE MOBILE HOME PARK PO BOX 88050 200 MILL AVE S 5339 PROSPECT RD#261 TUKWILA WA 98138 RENTON WA 98055 SAN JOSE CA 95129 1623059065 1623059126 2223059037 CITY OF RENTON CITY OF RENTON DAVIS EDITH C PARKS FINANCE 14808 131ST AVE SE 200 MILL AVE S 200 MILL AVE S RENTON WA 98058 RENTON WA 98055 RENTON WA 98055 2223059038 2223059040 2223059041 MORRIS NANCY LEE MAPLEWOOD ADD WATER COOP JOHNSON H ALAN+MARILYN F 12402 NE 149TH ST 15002 135 AVE SE 13505 MAPLE VALLEY HWY WOODINVILLE WA 98072 RENTON WA 98055 RENTON WA 98058 2223059048 2223059048 2223059053 COOKE CHARLES L+JEANNE C COOKE CHARLES L+JEANNE C HIERONIMUS MARSHALL 34504 38TH AVE S 34504 38TH AVE S 832 BROOKSTONE DR AUBURN WA 98001 AUBURN WA 98001 MERRITT ISLAND FL 32952 2223059065 2223059069 2223059069 PERRY GEORGE M CHARBONEAU PHILIP CHARBONEAU PHILIP 13205 SE MAPLE VALLEY HIWAY 14636 SE JONES PL 14636 SE JONES PL RENTON WA 98055 RENTON WA 98055 RENTON WA 98055 2223059070 2223059071 2223059076 IHNE RICHARD S HALL DIANA L SCHAFER PETER 13111 SE RENTON MAPLE VLY HWY 13110 SE 149TH ST 13134 SE 149TH ST RENTON WA 98055 RENTON WA 98058 RENTON WA 98058 2223059079 2223059081 2223059085 LORENZ FRED&ADDIE SHANE ROBERT S II HIEGEL DAVID A 14900 135TH SE 13103 SE MAPLE VALLEY HWY 13316 SE 149TH ST RENTON WA 98055 RENTON WA 98055 RENTON WA 98058 2223059088 2223059090 2223059106 SCHRAM R T MCCARTY BEULAH E WHITWORTH ARLENE 13321 MAPLE VALLEY HWY 4012 MAPLE VALLEY HWY PO BOX 219 RENTON WA 98058 RENTON WA 98055 FALL CITY WA 98024 2223059113 2223059113 2223059136 BAXTER KENNETH R+VALERIE A BAXTER KENNETH R+VALERIE A PERRY,GEORGE M 13307 SE RENTON-MAPLE VALLEY 13307 SE RENTON-MAPLE VALLEY 13205 SE MPL VLY HWY HWY HWY RENTON WA 98055 RENTON WA 98058 RENTON WA 98058 2223059136 2223059140 2223059150 PERRY,GEORGE M CITY OF RENTON DE RYCKE ROBERT L+SOCORRO C 13205 SE MPL VLY HWY BENNETT W E 13223 SE RENTON MAPLE VALLEY RENTON WA 98055 200 MILL AVE S RD RENTON WA 98055 RENTON WA 98058 5126900260 5126900265 5126900270 JONES MICHAEL S FEYEREISEN DOUGLAS L+PATTY ROHDE KAREN ANN 3604 SE 5TH ST 3612 SE 5TH ST 3616 SE 5TH AVE RENTON WA 98055 RENTON WA 98058 RENTON WA 98058 5126900275 5126900280 5126900330 JACKSON JENNIFER L RHODES A M LAPLANT LILA A 3620 SE 5TH ST 3624 SE 5TH ST LAPLANT JACK K RENTON WA 98058 RENTON WA 98055 7521 72ND DR NE MARYSVILLE WA 98270 5126900335 5126900340 5126900345 DOAN E C BRANDEL KURTIS P&BILLIE D DOBSON JOHN W 524 PIERCE AVE SE 1602 INDEX AVE SE 6611 114TH AVE SE RENTON WA 98055 RENTON WA 98058 BELLEVUE WA 98006 5126900350 5126900355 5126900360 OBRIEN BOBBI L VAN KEULEN JEFFERY D+DAWN M COBLENTZ BETTY&MIKE 3620 SE 5TH PL 3624 SE 5TH PL 22320 88TH AVE S RENTON WA 98056 RENTON WA 98055 KENT WA 98031 5126900365 5126900370 5126900385 MACGREGOR DONALD W BISHOP EILEEN M+TIMOTHY A CAMERON JEFFREY R 3621 SE 5TH ST 3629 SE 5TH ST 3600 SE 6TH STREET RENTON WA 98055 RENTON WA 98058 RENTON WA 98056 5126900390 5126900395 5126900400 FRANKLIN B&PIEDFORT D L MILLS DAVID T PERRIGO PAUL R 3608 SE 6TH ST 3616 SE 6TH ST 3624 SE 6TH ST RENTON WA 98055 RENTON WA 98058 RENTON WA 98058 5126900405 5126900410 5126900415 DOBSON JOHN W SEAQUIST JOHN H BLUHM CHRISTOPHER P+WENDY L 6611 114TH AVE SE I I I SW VICTORIA ST 3609 SE 5TH PL BELLEVUE WA 98006 RENTON WA 98055 RENTON WA 98058 5126900420 5126900425 5126900430 SWIFT WINNIFRED GATHMANN RICHARD JAMES HEHR GREGORY E 3613 SE 5TH PL 3621 SE 5TH PLACE 3625 SE 5TH PL RENTON WA 98058 RENTON WA 98058 RENTON WA 98058 5126900435 5126900475 5126900480 HORVATH DOUGLAS R MANNING CINDY L SCHAFER SCOTT C&RONDA L 512 NE 71 ST 3605 SE 6TH ST 3609 SE 6TH ST SEATTLE WA 0 RENTON WA 98058 RENTON WA 98055 5126900485 5126900485 5126900490 PORTER JOSEPHINE V LEPLEY YOLANDA HAGADORN GRANT 3613 SE 6TH ST 19826 97TH AVE S 3617 SE 6TH ST RENTON WA 98055 RENTON WA 98055 RENTON WA 98055 5126900495 5126900500 5127000180 ANDERSON ELDON E+JO ANN DEFORREST STEVEN E+ELAINE D DEHAVILAND ALFRED ALAN 3701 SE 6TH ST 3705 SE 6TH ST 13433 SE 141ST ST RENTON WA 98055 RENTON WA 98057 RENTON WA 98056 5127000190 5127000200 5127000210 DEHAVILAND ALFRED ALAN VICKERS LAWRENCE YAMAMOTO DAVID M 13433 SE 141ST ST 13419 SE 141ST 13420 SE 141ST RENTON WA 98056 RENTON WA 98055 RENTON WA 98055 5127000220 5127000230 5128000045 PAYNE RANDALL D+ET AL PAYNE RANDALL D+ET AL CAMPBELL BETH J 13434 SE 141ST ST 13434 SE 141ST ST 4037 SE 11TH ST RENTON WA 98059 RENTON WA 98059 RENTON WA 98055 5128000050 5128000110 5128000115 HUGHES MICHAEL A+SANDRA S STEINMETZER EARL R+SYLVIA M KAISERSHOT KELLY J 14803 130TH AVE SE 14809 131ST AVE SE 14804 130TH AVE SE RENTON WA 98058 RENTON WA 98055 RENTON WA 98058 6689400005 6689400010 6689400015 SMITH RICKIE A+CAROL L KARTES DAVID A+ANITA J QUIRIT ALEX Y+KATHRYN K 4012 SOUTHEAST I ITH STREET PO BOX 157 3926 SE I ITH RENTON WA 98058 EASTON WA 98925 RENTON WA 98055 6689400045 6689400050 6689400055 CAMPBELL BETH J CAMPBELL BETH J VOGEL AMY 4037 SE I ITH ST 4037 SE I ITH ST 4033 SE I ITH ST RENTON WA 98055 RENTON WA 98055 RENTON WA 98058 9189700050 Washington Dept.of Trans. Liz Menzel,President KIDD LEONARD ALAN Attn:Real Estate Services Maplewood Heights Homesowners Assoc. 13221 SE 151ST ST PO Box 47300 13803 SE 144th ST. RENTON WA 98058 Olympia,WA 98504 Renton,WA 98059 1523059014 1523059169 1523059008 1523059088 1523059187 2223059140 2223059150 2223059048 2223059136 2223059113_ 2223059088 2223059053 2223059037 2223059071 2223059065 2223059038 2223059076 2223059055 2223059106 2223059085 Z O 2223059040 2223059041 2223059079 9189700050 2223059081 2223059070 6689400050 6689400005 6689400010 6689400015_ o 6689400045 6689400055 1134000140 2223059090 2223059069 5126900500 5126900495 5126900490 5126900485 5126900480 LO D 5126900475 1134000180 1134000080 1134000050 1134000060 1134000070 1134000120 1134000130 1134000150 1134000160 5 a 1134000170 5127000180 5127000190 5127000200 5127000210 5127000220 5127000230 5126900420 5126900330 5126900335 �) 5126900340 5126900345 5126900350 5126900355 5126900360 5126900365 5126900370 5126900260 5126900265 5126900270 n 5126900275 5126900280 1623059018 1623059126 1623059022 1623059065 1623059048 1623059003 5126900385 5126900390 5126900395 5126900400 5126900405 5126900410 5126900415 5126900425 5126900430 5126900435 5128000045 5128000050 p "rp7,4 L 5128000110 5128000115 2 King County L, Surface Rater Management Division Department of Public Works 700 Fifth Avenue Suite 2200 Seattle,WA 98104 (206)296-6519 (206)296-0192 FAX MEMORANDUM January 20, 1994 TO: Cedar River atershed Management Committee (WMC) FM: Roz Glasse roject Manager, Cedar River Basin Plan Subject: February 3, 1994 WMC Hydro-Fish Subcommittee Meeting The February 3rd meeting will focus on two sections of the team draft Cedar River Basin Plan: 1) basinwide recommendations for regulations, programs, and special study needs; and 2) mainstem flood reduction and habitat restoration recommendations. The third section of the plan, tributary solutions, was discussed at prior WMC meetings. In preparation for this agenda the following materials are enclosed: o Agenda for February 3rd meeting; o Draft Basinwide recommendations (Attachment A); o Flood Damage Reduction Program (Attachment B); and o Habitat Restoration Program (Attachment C). Basinwide recommendations for aquatic habitat and water quality, and meeting notes from October 7, 1993 will be mailed next week. The Water Quality Subcommittee meeting scheduled for the afternoon has been canceled because there are only minor changes in the water quality basinwides since last discussed by the WMC. These changes will be shown in bold type. Comments and questions may be discussed with Kate Rhoads, Senior Water Quality Engineer, at 296-8046. We look forward to seeing you again on February 3rd. If you have questions regarding these materials in the interim, please call me at 296-8399. Enclosures 4 Table 2 - Monthly Flow Data for Maplewood Creek near confluence with Cedar River Flow Condition OCT NOV I DEC JAN I FEB MAR APR MAY JUN JUL AUG SEP 95% Exceedence 0.53 0.75 1.31 1.65 1.62 1.67 1.72 1.02 0.89 0.74 0.62 0.61 Mean 1.85 4.10 5.80 6.69 5.99 4.75 3.10 1.87 1.49 1.10 1.01 1.15 Std. Dev. 1.01 1.99 2.34 2.77 2.66 2.18 1.03 0.48 0.39 0.19 0.33 0.48 5% Exceedence 4.21 13.70 17.23 19.40 15.60 13.10 8.50 3.76 2.50 1.48 1.47 2.81 Mean and exceedence values based on 41 years of simulated flows using calibrated HSPF model,reflects current conditions land use as of approximately 1989. (Source: King Co. Surface Water Mgmt Division,Fax from David Hartley to Eileen McLanahan at Harza,4/29/96). Table 1. Expected Maplewood Creek Peak Discharges Based on Modeling Results (cfs) Storm Event Recurrence Maplewood Creek Basin Plan Current and Future Conditions Interval (Yr) (HEC-1) Report (HSPF, 15 min. data) Current Future Current Future 2 118 173 59 132 10 202 275 104 207 25 251 333 135 257 100 300 392 197 349 (Source: Project Description for Corps Permit Application dated November 1995 by Harza Northwest,Inc.) Table 3 - Sedimentation Basin Design Outlet Flows Water Elevation in New Fish Limited Flow to Main Spillway Total Sediment Basin Channel Flow Existing Creek Flow Creek (ft) (cfs) (cfs) (cfs) Flow cfs) 111.17 0 0 0 0 1 1 1.42 0.5 0.1 0 0.6 1 1 1.67 2.0 0.3 0 2.3 112.17 7.7 0.8 0 8.5 112.67 17 1.5 0 18.5 1 13.17 29 2.4 65 96 113.67 42 3.3 185 230 114.17 4S 4.3 347 396 Riparian and Instream Habitat Report Maplewood Creek Fish Passage Channel Project July 1995 6K`k C L un ivr a luk&1 Prepared for _ I nS:1c, L'A,tc s,� , s 1c City of Renton, Washington Prepared by HARZA Riparian and Instream Habitat Report Maplewood Creek Fish Passage Channel Project July 1995 Prepared for City of Renton, Washington Prepared by HARZA Riparian and Instream Habitat Report TABLE OF CONTENTS 1.0 Introduction............................................................................1 2.0 Existing Conditions...................................................................1 2.1 Upstream and Downstream Passage .........................................................2 2.2 Hydrologic/Hydraulic Conditions............................................................3 2.3 Habitat Quality ..................................................................................3 3.0 Design Criteria ........................................................................5 4.0 Proposed Enhancement Measures ................................................7 4.1 Instream Habitat Structures ...................................................................7 4.1.1 Channel A Section.......................................................................7 4.1.2 Channel B Sections ......................................................................8 4.1.3 Channel C Sections (Fairway Crossings)............................................8 4.1.4 Channel D Sections (Fish Ladders)...................................................9 4.2 Streambank Plantings...........................................................................9 5.0 Expected Benefits................................................................... 10 5.1 Hydrologic/Hydraulic Conditions.......................................................... 10 5.2 Habitat Quantity and Quality................................................................ 11 6.0 Literature Cited..................................................................... 12 Figures 1. Low-Flow Fish Passage Channel Conceptual Planting Design Plan View 2. Low-Flow Fish Passage Channel Section View of Channel Design ii Riparian and Instream Habitat Report MAPLEWOOD CREEK FISH PASSAGE CHANNEL Riparian and Instream Habitat Report 1.0 Introduction The Maplewood Creek Basin Plan ( draft Parametrix, 1989) was developed primarily to address flood control, water quality, and aquatic habitat concerns. In addition to outlining major policy goals, the Plan identified ten specific projects to stabilize streambanks, reduce erosion and sedimentation, manage stormwater, and enhance habitat for fish and wildlife. The Maplewood Creek Fish Passage Channel, proposed for the portion of the creek traversing Maplewood Golf Course, is one of the projects intended to improve flood conveyance and fish habitat along the main channel of Maplewood Creek. The Fish Passage Channel is one of three elements aimed at improving conditions on Maplewood Creek. The other two elements include a fish ladder recently constructed by the Washington Department of Transportation (WSDOT) at Maplewood Creek's confluence with the Cedar River; and improvements to the existing sediment retention basin just upstream of the Project reach. This report focuses on riparian and instream habitat. Existing conditions are described and measures for enhancement are proposed. In addition, this report serves as a basis for the plan to mitigate wetland impacts associated with construction of improvements to the existing sediment basins, and diversion of water from the existing channel for Maplewood Creek. 2.0 Existing Conditions According to the Cedar River Current and Future Conditions Report (King County 1993), coho (Oncorhyncus kisutch) may use Maplewood Creek as far as RM 0.4, and cutthroat trout (O. clarki) up to RM 1.0. Sockeye (O. nerka), chinook (O. tshawyacha), steelhead (O. mykiss), and Dolly Varden (Salvelinus spp.) are present in the Cedar River and were probably present in the creek, also, prior to construction of the railroad, highway and 72-inch culvert, and the golf course. Other fish species likely to occur in the Project reach under current conditions include speckled dace (Rhinichyths osculus), three-spine stickleback (Gasterosteus aculeatus) and sculpin (Cottus spp.). Maplewood Creek Fish Passage Channel Page 1 WPC\95PROJECTS\7163G\RIP&INS.DOC\01/23/96/10:15 AM/SDC Riparian and Instream Habitat Report The principal factors now affecting fish habitat and fish populations in Maplewood Creek are: 1) blockages to upstream and downstream fish passage; 2) hydrologic/hydraulic conditions that cause extreme winter floods and low summer flows; and 3) low-quality aquatic habitat lacking structural diversity. 2.1 Upstream and Downstream Passage In the Project reach, Maplewood Creek has been channelized to run in a straight course from the existing sediment ponds south through the Maplewood Golf Course to State Route 169. Before the widening of SR 169, the creek crossed south under the highway via a 165- foot long, 42-inch diameter steel culvert, then turned west and traveled through a 1,000-foot long, 72-inch diameter RCP culvert buried next to the railroad bed before entering the Cedar River at RM 3.4. During widening of the highway, the 42-inch diameter culvert was replaced with two 8-foot by 4-foot box culverts. The creek still uses the 72-inch culvert to reach the Cedar River. Following construction of the low-flow channel, this system will continue to handle high flows in the creek that are diverted around the low-flow channel, but baffles installed to facilitate upstream fish migration within the 72-inch diameter culvert will be removed. Nominal capacity of this system under current conditions is approximately 150 cfs (w/baffles removed). Note: with extreme flooding of the Cedar River, the capacity of this system is probably reduced to approximately 100 cfs. The culvert system blocks Maplewood Creek to anadromous fish except during periods of high flow in the Cedar River. The culvert system will be bypassed upon completion of the Fish Passage Channel, when the new channel will be connected to the new WSDOT fish ladder by removing ecology blocks that were placed at the structure's headwall. Fish passage is blocked at the upstream end of the Project reach by the existing sediment pond and upper concrete dam. These structures will be removed as part of a project to expand and improve sediment retention capabilities. The sediment basin will be enlarged and improved by adding a fishway outlet and a flow diversion structure. This project is described in detail in the Maplewood Creek Sedimentation Basin Reconstruction and Improvement Project Phase I Design Report (Harza Northwest 1994). Because fish passage concerns have already been addressed in other reports, they will not be considered further in this report. Maplewood Creek Fish Passage Channel Page 2 WPC\95PROIeCTS\7163G\RIP&INS.DOC\01/23/96/10:15 AM/SDC Riparian and Instream Habitat Report 2.2 Hydrologic/Hydraulic Conditions Continuous HSPF simulations of over 42 years (October 1948 - June 1991) of hourly stream flows in Maplewood Creek were conducted by King County Surface Water Management staff, to characterize flow regimes under various basin development conditions. Average annual simulated flows for Maplewood Creek are 3.20 and 3.72 cfs under the current and the future basin land use conditions, respectively (King county 1993). Flows are lowest from July through October and highest from December through March. Modeled daily flows indicate that flows exceed 20 cfs from 5 to 7 days per year, primarily during the winter (Harza Northwest 1994). The peak flow for the 2-year, 24-hour storm event was 118 cfs and 173 cfs under the existing and the future land use conditions, respectively. The existing channel does not provide adequate flood conveyance for flows over 150(±) cfs, and portions of the golf course can be flooded if flows exceed the two- to ten-year flood magnitude. In addition, Cedar River flooding further reduces the capacity of the existing system by creating a backwater at the downstream end of the 72-inch culvert. When capacity of the culvert system is reduced, water from Maplewood Creek may flood the golf course. Extreme flooding is generally detrimental to production of juvenile salmonids, and production of coho smolts has been directly correlated to low summer flows of tributary streams in the Puget Sound region (Baranski 1989). 2.3 Habitat Quality Habitat quality in the canyon reach of Maplewood Creek, above the existing irrigation ponds, was surveyed by King County Surface Water Management staff in 1991-1992. The Cedar River Current and Future Conditions Report (1993) describes habitat on top of the plateau as being degraded and fragmented by development. The upper portion of the canyon reach (RM 0.75-1.38) is described as "heavily affected by channel scour, a naturally unstable geologic condition, and lateral bank sliding". The pool:riffle ratio was estimated to be 30:70. The number of pieces of large woody debris per channel width was estimated at 0.7, in comparison to an average of 2-2.7 in unmanaged small streams (Peterson 1992). The lower portion of the canyon reach (RM 0.5-0.75) was described as containing some good habitat, although it is affected by sedimentation and high flows. The pool:riffle ratio was similar, approximately 30:70, but the number of pieces of large woody debris per channel width was estimated at 1.7. Maplewood Creek Fish Passage Channel Page 3 WPC\95PRO1PCTS\7163G\RIP&INS.DOC\01/23/96/10:15 AM/SDC Riparian and Instream Habitat Report Fish habitat in the stream segment through the golf course was qualitatively surveyed during site visits on March 4 and April 12, 1995. This reach extends approximately 1,250 feet from the sediment pond to the point at which it enters the 42" culvert. Length of the culverted segment is approximately 1,000 feet. The culverted segment is assumed to provide no fish habitat. Gradient through the upper 300 feet of channel is steepest (approximately 10 percent). The channel is also narrow and confined through this reach, as it traverses the parking lot adjacent to the clubhouse. In this vicinity, the wetted width is approximately 2 feet. The substrate is clean gravel from 1/2 to 2" diameter. Habitat consists entirely of runs. No woody debris or other instream habitat structure is present. Banks are vertical and overgrown with dense Himalayan blackberry (Rubus discolor). This strip of vegetation, while narrow, does provide shade and cover along the stream. Length of the open channel as the stream crosses the golf course is approximately 950 feet, with a gradient from 2 to 4 percent. This section of the creek was channelized and straightened in the past, and is disturbed due to excavation, sediment removal, and mowing. The wetted width varies, with short stretches 2 feet wide, increasing to as much as 12 feet where gravel deposition has occurred. The substrate is also variable; patches of clean gravel alternate with areas of silt deposition. Habitat is predominantly riffles and glides, with small cascades and pools at the downstream ends of culverts installed under cart paths. The pool:riffle ratio is approximately 20:80. No large woody debris is present in the creek or along the banks. A few boulders are present. Vegetation along this reach is predominantly grasses, with scattered soft rush (Juncus effusus), small-fruited bulrush (Scirpus microcarpus), and patches of smartweed (Polygonum spp.) and creeping buttercup (Ranunculus repens). A few cottonwood (Populus trichocarpa) seedlings, alder (Alnus rubra) saplings and blackberry were also noted during site visits. Bank slopes vary from vertical to 3:1 and appear stable along most of the creek, although small areas of slumping and erosion were noted. Bank soils appear to be mixed sandy, loam and clay, likely as a result of excavation and grading during golf course construction and channelization. Quarry spalls and some larger materials (12-18" angular rip-rap) have been placed as erosion control at several points along the bank; some of this has fallen into the channel. Water quality data discussed in the Cedar River Current and Future Conditions Report (King County 1993) indicate that "significantly high" levels of suspended solids, turbidity, total phosphorus and fecal coliform bacteria were documented during two storm events. Although data were collected above the irrigation ponds, similar levels could be expected in Maplewood Creek Fish Passage Channel Page 4 WPC\95PRO1CCTS\71630\RIP&INS.DOC\0123/96/10:15 AM/SDC Riparian and Instream Habitat Report the golf course reach of Maplewood Creek. Golf course maintenance requires use of fertilizers, fungicides and pesticides. These are applied according to EPA guidelines, but could affect overall water quality and nutrient conditions. Although water quality has not been comprehensively studied, the presence of cutthroat in the upper watershed indicates that water quality is at least adequate (Hughes and Gammon 1987). In summary, the existing channel may meet the minimum requirements of sockeye, coho and cutthroat, which tolerate a wider range of environmental conditions than other salmonids (Wydoski and Whitney 1979), but it is far from ideal. It has the relatively featureless characteristics of a ditch, without the instream diversity, substrate, or cover needed for spawning and rearing. The current hydrologic regime, including scouring flood flows in the winter, and extremely low flows during the summer, provide poor support for fish production. These habitat elements can be substantially improved by construction of the Fish Passage Channel. 3.0 Design Criteria Design criteria were based primarily on the hydraulic capacity needed to prevent flooding and the habitat characteristics necessary to promote production of juvenile coho salmon and cutthroat trout. Golf course maintenance requirements, playability and aesthetics were also integrated into the plan. For example, riparian vegetation is designed to provide the stem densities needed to slow flood waters. It will have the added benefits of stabilizing banks and preventing erosion, provide overhanging shade and cover for fish, and will add texture and color to the existing landscape. Increasing channel sinuosity will provide a more natural- appearing stream course than the existing ditch, and will also provide more habitat area and diversity for fish. Design criteria relating to fish habitat are discussed below. Sockeye, coho and cutthroat are the species most likely to utilize Maplewood Creek, and are most likely to benefit from habitat enhancement measures in the Fish Passage Channel. Their habitat preferences for adults are similar (Wydoski and Whitney 1979). All three species require riffle habitat for spawning, with a gravel substrate that is clean, stable, and well-oxygenated. Pools provide cover for spawning fish and feeding and rearing areas for juvenile coho and cutthroat fish. Consequently, it is important for pools and riffles to be adjacent for them to function best for fish. Sockeye and coho salmon generally spawn from September through December, burying their eggs in streambed gravel, often in pool tailouts and riffles. Sockeye fry emerge from the Maplewood Creek Fish Passage Channel Page 5 WPC\95PROJECTS\7163G\RIP&INS.DOC\01/23/96/10:15 AM/SDC Riparian and Instream Habitat Report gravel between February and May and then immediately outmigrate to Lake Washington. Coho fry emerge from the gravel in April or May and remain in the freshwater stream for at least one year before outmigrating to saltwater. Coho juveniles congregate in slow pools, feeding primarily on aquatic insects such as caddisflies, mayflies, and stoneflies. Other prey items include worms, fish eggs, terrestrial insects, and smaller fish. Cutthroat trout migrate into spawning areas during October, November, and December, but do not spawn until January, February, and March. Fry emerge in June or July. Unlike coho and sockeye, cutthroat trout may remain in freshwater streams their entire life, or may outmigrate to larger water bodies (e.g. Lake Washington or the ocean) for periods of several months and then return to their "home" stream for spawning. Juveniles and adults feed primarily on aquatic insects, but also eat terrestrial insects, crayfish, salamanders, fish eggs, and smaller fish. Habitat suitability criteria in terms of water depth and velocity is not well defined for streams as small as Maplewood Creek, so the following descriptions are general in nature and relate to the size of fish most likely to access and use this particular stream. For spawning, sockeye and coho salmon use gravel 1/4 to 3 inches in diameter located in water depths of 0.5 to 2.0 ft with relatively fast velocity of 1 to 3 feet per second (fps). They also require pools deeper than 1 ft to hold in prior to spawning. Cutthroat trout are smaller than adult coho and sockeye, and spawn in smaller gravel with less depth (0.3 to 1.0 ft) and velocity (0.5 to 1.5 fps). Juvenile coho salmon rear in scoured stream margins and pools with depths of 0.5 to 5.0 feet and water velocity of 0.1 to 1.0 fps. They frequently rear in ponds, and require refuge habitats (e.g. eddies created by boulders and logs, ponds, and alcove pools) to survive winter floods. Juvenile and adult cutthroat trout use a variety of habitats with water depths 0.5 to 5.0 ft deep and velocities of 0.5 to 2 fps. Both coho and cutthroat species require riffles to produce the aquatic insects they prey on. Consequently, a pattern of adjacent riffles and pools is beneficial, with open canopy over riffles allowing sunlight to increase production and overhanging canopy over pools to provide cover from sunlight and predators. Summer water temperatures of 12 to 16 degrees C with dissolved oxygen concentration of 5 mg/l or greater is best for production of both species. Maplewood Creek Fish Passage Channel Page 6 WPC\95PROJ ECTS\7163G\RIP&INS.DOC\01/23/96/10:15 AM/SDC Riparian and Instream Habitat Report 4.0 Proposed Enhancement Measures The Fish Passage Channel will be excavated through the golf course and designed to replicate a natural stream channel as closely as possible (Figure 1). It will contain all flow from Maplewood Creek up to 20 cfs, and will be designed for a maximum flow of 45 cfs. Higher flows during runoff and flood conditions will be directed to the existing ditch or a reconfigured high-flow channel. The channel design includes three typical cross-sections (Figure 2): 1) trapezoidal streambed with log-drop structures, 2) trapezoidal streambed with overbank floodway, and 3) half-round culvert. In addition, two reaches of the channel which are 5-10 percent gradient will require laddering to allow upstream movement of fish. In reaches that are from 2-5 percent gradient, the cross-section will be trapezoidal in shape and provided with log-drop structures (Channel A). This section will pass high flows during the winter, while maintaining as much depth as possible during low flows in the summer. No overbank floodway is needed at this slope. In the lower-gradient reaches (0-2 percent gradient), the channel cross-section will be generally trapezoidal with overbank floodway (Channel B) to provide adequate water depth for fish during the summer, and flood conveyance during high-flow events. In places where the channel crosses golf course fairways and/or utilities, the channel cross section will consist of a 1/2 round culvert (Channel C), to minimize the width of the cut and maximize the stability of the crossing. Sections of fish ladder will be rectangular in shape. Intermittent bridge crossings (up to 7) will be constructed over the channel to facilitate the circulation of golfers and maintenance vehicles around the golf course. 4.1 Instream Habitat Structures 4.1.1 Channel A Section Approximately 430 feet of the new channel will have a 2-5 percent gradient. Log drop structures will be placed at 20- to 45-foot intervals through this reach. Log drop structures are intended to reduce water velocities, create slow pools, stabilize riffles, and provide cover and resting habitat for fish moving upstream. Logs should be sufficient in length to span the stream and be well-anchored into both banks. A 1- to 2-foot layer of rip-rap with cobble or quarry spall bedding should be placed as protective backfill for anchor protection on each bank. Logs should be 24 inches in diameter; if smaller-diameter logs are used, two logs should be cabled together. A notch 4 inches deep and 12 inches wide should be cut into the top log to concentrate flow during low-flow periods of the year. Clay lining or geomembrane Maplewood Creek Fish Passage Channel Page 7 WPC\95PROJECTS\7163G\RIP&INS.DOC\01123/96/10:15 AM/SDC Riparian and Instream Habitat Report fabric will be provided for channel sections A and B, forming an impervious underbedding for the stream to minimize seepage losses during low flows. Cobble or quarry spalls should also be placed just below each log drop to protect the clay lining as scour pools form. Immediately upstream of log-drop structures, washed gravel of 1/4 to 6 inches in diameter will be added so that the depth of gravel is about 1 foot, suitable for coho and sockeye salmon spawning. Log- drop structures will be placed in relatively straight sections of stream to avoid bank erosion from resulting flow patterns. 4.1.2 Channel B Sections Approximately 1,000 feet of the new channel will have a trapezoidal cross-section. Overall gradients will be from 0 to 2 percent. Log-drop weirs and triangle wing deflectors will be installed in this channel type at about 12 sites about 100 feet apart to increase pool depth, provide structural cover, and increase low-flow thalweg depth. Because of the low gradient, washed gravel added to the upstream side of log-drop structures will be small (1/4 to 3 inches in diameter) to create optimum riffles for spawning and aquatic insect production. In addition, single boulders 12 to 24 inches in diameter will be placed at about 30 sites in the channel to provide islands of in-channel cover. Wing deflectors will be placed immediately upstream of several of the bends in the channel so that the thalweg is directed into the scour pool at the apex of the bend. Deflectors will be built in the plan-view shape of a solid triangle to minimize back-cutting during high flows, using boulders 1 to 3 ft in diameter and cobbles 6 to 12 inches in diameter. The opposite bank will be stabilized with vegetation, boulder bank revetments, or log cover structures as necessary. 4.1.3 Channel C Sections (Fairway Crossings) These sections comprise a total of about 260 feet of channel located in three places. Where the stream crosses each fairway, lengths of 4-foot diameter half-round CMP culvert will be installed to contain the flow, prevent stream meandering, and reduce the width of the cross-sections so that interference with golf course play and/or underground utilities is minimized. Washed gravel 1/2 to 2-inch-diameter will be added to provide a natural substrate in the culverts. Culvert slope will be less than 2 percent so that water velocity will be negotiable by juvenile fish. Maplewood Creek Fish Passage Channel Page 8 WPC\95PROJECTS\7163G\RIP&INS.DOC\01/23/96/10:15 AM/SDC Riparian and Instream Habitat Report 4.1.4 Channel D Sections (Fish Ladders) Two short reaches of the creek will be steep enough in gradient (approximately 10 percent) to require laddering. Immediately below the sediment pond, a length of channel approximately 90 feet long will be laddered. A second length of channel 50 feet long, adjacent to the existing clubhouse, will also be laddered. The pool and weir design will be constructed of concrete, with v-shaped 8" deep weirs at 6-8' intervals through each of these reaches. Pools will be 3.5 feet deep between the weirs at normal flows. Construction design will be similar to plans, sections and details for the WSDOT fish ladders and the fishway outlet shown in the Maplewood Creek Sedimentation Basin Reconstruction and Improvement Project Phase 1 Design Report (Harza Northwest 1994). 4.2 Streambank Plantings The upper end of the Project area below the proposed sediment pond and adjacent to the existing clubhouse marks a transition in both topography and landscaping. Above the project, hillslopes are naturally vegetated. Within the golf course, and along the project reaches, the site is developed for recreation and intensive human activity. A mix of native trees and tall shrubs will be planted along the channel which will provide a visual transition from the steep, forested hillside to the gently-sloping turf of the fairways. Live-staking the channel banks with cuttings of native willow (Salix lasiandra, S. scouleri) and red-osier dogwood (Cornus stolonifera) is recommended in this vicinity, and could also be used between Fairways 1 and 2, where vegetation height is not a concern. These species are well-adapted to local conditions, start well from cuttings, and require little or no maintenance. Willow and dogwood provide attractive color year-round. Other benefits include shallow, laterally- spreading root systems that hold soils well, growth forms that provide overhanging shade and cover for fish, and low cost of planting. Plantings will be concentrated in areas of log and boulder structures and the pools they create. Cuttings may be available at low cost through King County SWM salvage projects or on city-owned lands in the Cedar River basin. Hydroseeding with a mix of low-growing grass and wildflowers will provide rapid soil coverage and reduce erosion while the cuttings are starting out. Low-growing native and hybrid willows (Salix brachycarpa, S. caprea) and hybrid species of dogwood (Cornus sericea 'Baileyi', Cornus alba 'Siberica') and pyramid spirea (Spiraea x pyramidata) are recommended along Channel A and Channel B sections in areas where golf course design criteria make spreading trees or tall shrubs unacceptable. These species reach only 2-6 feet in height, and would be compatible with the existing landscaping Maplewood Creek Fish Passage Channel Page 9 WPC\95PROJECTS\71636\RIP&INS.DOC\01/23/96/10.15 AM/SDC Riparian and Instream Habitat Report and maintenance. With taller species being planted below the existing ground level, they would not obstruct views along the fairways and greens, and will also help to provide shade and bank stability. Species selected for planting will depend, in part, on availability. They are not always available as cuttings, and may be planted as 18"-24" rootstock on 3' centers. Plantings along the laddered sections of the channel must be tolerant of drier conditions than those species listed above. Suggested native plants include groupings of vine maple (Acer circinatum), Oregon grape (Berberis nervosa) and salal (Gaultheria shallon), and groupings of Pacific ninebark (Physocarpus capitatus), mock orange (Philadelphus lewisii) and black twinberry (Lonicera involucrata) planted as 3-4' rooted stock on 3' centers. The taller of these species will provide overhanging shade, while dense plantings of lower-growing species will help to isolate the fishway from golf course play and from the view of golfers. Turf grasses are recommended for the margins of Channel C Typical Cross-Sections, to minimize the visual impact of the fish channel across the fairways. Use of turf grasses will also simplify maintenance of the fairways. Final selection of species and locations and density of plantings will be closely coordinated with landscaping that is currently underway at the golf course. Existing cedar, locust and fir trees will be retained. Some small-diameter fir trees may be moved to allow construction, and replanted where they will provide shade to the stream. 5.0 Expected Benefits Construction of the Fish Passage Channel is expected to significantly improve habitat for fish in Maplewood Creek. Benefits are difficult to quantify, however, because of the number of variables involved, including upstream water uses, annual weather patterns, and escapement of spawners to utilize the new habitat. Consequently, the benefits are described generally in terms of changes to physical channel features. 5.1 Hydrologic/Hydraulic Conditions The Fish Passage Channel will be capable of passing up to 45 cfs, which will improve flood conveyance through the golf course. Routing of higher flows through the existing channel will protect the Fish Passage Channel from scouring floods. In the new channel, the increased length and reduced gradient will result in slower overall water velocity and reduced energy of water, consequently erosion potential will be reduced. In-channel structures will Maplewood Creek Fish Passage Channel Page 10 WPC\95PROJECTS\7163G\RIP&INS.DOC\01/23/96/10:15 AM/SDC Riparian and Instream Habitat Report help to concentrate the summer low flow such that surface flow should remain continuous. In addition, these structures will provide a diversity of water velocities throughout the channel to accommodate all lifestages of salmonids and produce aesthetically pleasing pools and riffles and a natural-looking streamcourse. Vegetation will also serve to reduce stream energy, stabilize banks, and add to the natural appearance of the channel. 5.2 Habitat Quantity and Quality Construction of the new low-flow channel, together with the WSDOT ladder at the Cedar River and planned passage facilities at the sedimentation pond will open approximately 3.4 miles of Maplewood Creek that are currently blocked to anadromous fish, and add approximately 0.4 miles of habitat through the golf course. The increased sinuosity and length of open channel will provide more habitat area for fish and aquatic organisms (Ministry of Environment 1980). In-channel features and the resulting pools, riffles, and cover components will greatly increase the quality of habitat for all stream dwelling life stages of sockeye and coho salmon and cutthroat trout. Addition of gravel will increase the amount of suitable spawning habitat and the production of periphyton and aquatic insects. In addition to increasing the diversity of the benthic community, periphyton are also important in reducing phosphorus levels in streams (Davis et al. 1990). The compressed thalweg will increase the depth of water during low flow conditions to facilitate movement of adult and juvenile fish. Vegetation will stabilize the banks from erosion during high flows, filter suspended sediments, provide shade to moderate stream temperatures and light levels, add nutrients to the stream in the form of leaf litter and terrestrial insects, and provide cover for fish from predators (Bisson et al. 1992). Accurate estimates of production or population potential require intensive study of individual streams. No investigations of this type have been conducted in the Maplewood system. As an indicator of coho production, studies of coho in 10 Pacific Northwest streams showed mean annual production of coho smolts as 0.31/m (Baranski 1989). Numbers of cutthroat (all ages) in one Olympic Peninsula stream were estimated five times in a two-year period, and averaged 0.30/m2 (June 1981); however no coho were present in the study stream. In situations where both coho and cutthroat are present, cutthroat numbers may be somewhat lower. Sockeye production is estimated in terms of fry outmigrating from the stream, and would be several hundred sockeye fry per spawning pair. Maplewood Creek Fish Passage Channel Page 11 WPC\95PROJECTS\7163G\RIP&INS.DOC\01/23/96/10:15 AM/SDC Riparian and Instream Habitat Report 6.0 Literature Cited Baranski, C. 1989. Coho smolt production in ten Puget Sound streams. Technical Report 99, Washington Dept. of Fisheries. 29pp. Bisson, P.A., Quinn, T.P., Reeves, G.H. and S.V. Gregory. 1992. Best management practices, cumulative effects, and long-terms trends in fish abundance in Pacific Northwest river systems. Pages 189-232 in: Naiman, R.J., ed. Watershed Management: Balancing Sustainability and Environmental Change. Springer-Verlag, New York, New York. City of Renton. 1989. Comprehensive Stormwater Plan. Maplewood Creek Basin Plan. Public Works Department, Stormwater Utility Division. Davis, L.S., J.P. Hoffman and P.W. Cook. 1990. Production and nutrient accumulation by periphyton in a wastewater treatment facility. J. Phycol. 26:617-623. Gray, D.H. and A.T. Leiser. 1982. Biotechnical Slope Protection and Erosion Control. Van Nostrand Rheinhold, New York. Hughes, R.M. and J.R. Gammon. 1987. Longitudinal changes in fish assemblages and water quality in the Willamette River, Oregon. Trans. Am. Fish. Society. 116:196-209. June, J.A. 1981. Life history and habitat utilization of cutthroat trout (Salmo clarki) in a headwater stream on the Olympic Peninsula, Washington. M.S. Thesis, University of Washington. King County Department of Public Works. 1993. Cedar River Current and Future Conditions Report. Surface Water Management Division. King County Department of Public Works. 1993b. Guidelines for Bank Stabilization Projects. Surface Water Management Division. Ministry of Environment. 1980. Stream Enhancement Guide. Government of Canada, Fisheries and Oceans and Province of British Columbia, Ministry of Environment. Wydoski, R.S. and R.R. Whitney. 1979. Inland Fishes of Washington. University of Washington Press, Seattle and London. Maplewood Creek Fish Passage Channel Page 12 WPC\95PROJECTS\7163G\RIP&INS.DOC\01/23/%/10:15 AM/SDC Riparian and Instream Habitat Report I Setlment Pond existing wooded slope • • • _ G8 Section A F8 T6 F6 • _ '• • G5 • • G3 • Section • F5 . , - • • -� • •....___._ • F • _____._._.....__. • T4 i • • F4 ction C G2 F2 • Section B F1 rn C • i N western red cedar ❑ tall-growing native Approz Scale: f`r saia maple up.Dragon grape, ❑ low-growing native _0 700, 2W, Pacific ninebork,mock orange, willow, hybrid >f'V block twineberry group ® turf grasses • • Cart Path '� ♦Alternate Cart Path Figure 1 Low-Flow Fish Passage Channel Conceptual Planting Design Plan View Maplewood Creek Fish Passage Channel WPC195PROIRCM7163"GPGU.DOC111/27/95/O1:57 PWSaa Riparian and Instream Habitat Report I { 20'MIN. —> EX15T GRADE SLOPE 2%MIN. SLOPE 27 MIN. TO EX15T.GRADE H _ TO EX15T.GRADE 4' 0 1.0 4' 3"-6"TOP501L LOG DROP 5TRUCTURE &HYDR05EED 3'-6"COBBLE IMPERVI05 CLAY LINER 12"-24"BOULDER V-2"GRAVEL SECTION A rc 26'MIN. 6' 3' 10, 3' 6' EX15T.GRADE SLOPE 2%MIN. SLOPE 2%MIN. TO EX15T.GRADE r I H TO EX15T.GRADE 3' 3"-6"TOP501L c-4'--> &HYDR05EED 12"-24"BOULDER IMPERVIOU5 CLAY LINER 3'-6"COBBLE LWD INSTALLED 1"-2"GRAVEL IN CHANNEL SECTION B r12'MIN. I SLOPE 2%MIN. 5LOPE 2%MIN. TO EX15T.GRADE H 2 HTO EX15T.GRADE 4,(/ Y-6"TOP501L&HYDK05EED �—4' 1/2 4'PIPE SECTION C. Figure 2 Low-Flow Fish Passage Channel Section View of Channel Design Maplewood Creek Fish Passage Channel VA-M95PROTP.0&TIMRHOPOW.DOLM 1/22IW03:57 PWSDC Project Description For Corps Permit Application Maplewood Creek Flooding and Habitat Improvement Projects November 1995 Prepared for City of Renton, Washington Prepared by HARZA Project Description For Corps Permit Application Maplewood Creek Flooding and Habitat Improvement Projects November 1995 Prepared for City of Renton, Washington Prepared by HARZA Project Description for Corps Permit Application TABLE OF CONTENTS I. Executive Summary..................................................................I II. Background Information............................................................I Description of Maplewood Creek ...................................................................2 FisheriesInformation..................................................................................2 Hydrologyand Flooding ..............................................................................3 Relationship of the Proposals to Recent Planning Efforts.......................................4 III. Project Descriptions..................................................................5 Low-Flow Fish Passage Channel Project ..........................................................5 Introduction ......................................................................................5 Proposed Project Elements ....................................................................6 Impacts Due to Construction..................................................................8 Future Maintenance.............................................................................8 Sedimentation Basin Reconstruction and Improvements Project...............................8 Introduction ......................................................................................8 Proposed Project Elements ....................................................................9 Impacts Due to Construction................................................................ 12 FutureMaintenance........................................................................... 13 Maplewood Creek High-Flow Capacity Improvements ....................................... 13 Introduction .................................................................................... 13 Impacts Due to Construction................................................................ 14 Future Maintenance........................................................................... 15 IV. Benefits ............................................................................... 15 V. Impacts................................................................................ 15 Figures 1 a. Project Vicinity Map lb. Project Vicinity Map 2a. Schematic Site Plan 2b. Adjacent Property Ownership Information 3a. Low-Flow Fish Passage Channel Conceptual Planting Design Plan View Maplewood Creek Flooding and Habitat Improvement Projects Page ii WPC\95PROJ\7163G\FLOODHAB.DOC\01/23/96\9:08 AM\SDC Project Description for Corps Permit Application 3b. Low-Flow Fish Passage Channel Section View of Channel Design 4a. Proposed Sedimentation Basin Improvements Site Plan and Sections 4b. Proposed Sedimentation Basin Improvements Site Plan and Sections (cont.) 5. Proposed Sedimentation Basin Spillway and Outlet Plans, Sections and Details 6. Proposed Sedimentation Basin Fishway Outlet Plans, Sections and Details 7. Proposed Improvements to Existing Creek Channel Plan and Sections Maplewood Creek Flooding and Habitat Improvement Projects Page iii WPC\95PR01\7163G\FLOODHAB.DOC\01/23/96\9:08 AM\SDC Project Description for Corps Permit Application MAPLEWOOD CREEK FLOODING AND HABITAT IMPROVEMENT PROJECTS I. Executive Summary The City of Renton is proposing three projects along lower Maplewood Creek in Renton, Washington (Figures 1 and 2). All three projects are located on the City of Renton's Maplewood Golf Course. The three projects include: 1) construction of a new low-flow fish passage channel across the golf course, 2) reconstruction and improvement of two existing sediment ponds, and 3) high-flow capacity improvements to the existing Maplewood Creek channel. The first two projects are planned to be constructed this year. The third project, the high flow capacity improvements is not currently scheduled for construction. Complete descriptions of the three projects are provided in Section III of this document. The projects are intended to mitigate flooding and so protect public and private property, to improve instream habitat conditions and the opportunity for upstream fish migration past the golf course, and to reduce sediment deposition in the creek channel below the sediment basin. Construction of the new low-flow fish passage channel will not involve any dredging or filling of surface water or wetlands. Therefore, this construction activity is not a part of the Corps permit application. However, the City is aware that water cannot be diverted from Maplewood Creek to the new channel until a Corps permit is issued, authorizing this diversion. The sedimentation basins and existing Maplewood Creek are also subject to regulation by the Corps of Engineers. Therefore complete descriptions of all three projects are included in this Project Description. Wetlands along Maplewood Creek meet the City of Renton's criteria for Category 3 wetlands, due to channelization of the creek and alteration of the soils. Effects on the wetland buffer area ( 25 feet on either side of the wetland boundary, based on urban zoning) will be temporary, and no adverse impacts are anticipated. The existing and future sedimentation basins do not meet the City's definition of regulated wetlands because they are managed as stormwater facilities. II. Background Information Maplewood Creek is a minor tributary of the Cedar River. The confluence of Maplewood Creek is located at about Cedar River mile 3.3. (Figures la and lb show the Maplewood Creek Flooding and Habitat Improvement Projects Page I WPC\95PROJV163G\FLOODHAB.DOC\01123196\9:03 AM\SDC Project Description for Corps Permit Application general site location of the projects.) The total basin area contributing to Maplewood Creek is small, about 1,100 acres. One-third of the basin (primarily the south and west) is within the City of Renton's corporate limits. The remainder of the basin is in unincorporated King County (within the Urban Growth Area). The total length of Maplewood Creek is 1.8 miles, 1.4 miles long to the top of the plateau above the Cedar River valley. The project reach for the low-flow fish passage channel would extend from RM 0.0 to 0.4 across the golf course (from RM 0.0 because the low-flow channel to the fish ladder would bypass the existing 900-foot culvert described below). The project reach for sediment pond reconstruction would be the area of the existing sediment ponds between RM 0.4 and 0.5. The project reach for the high-flow capacity improvements would include that portion of the existing Maplewood Creek channel between RM 0.1 and 0.4. (Figure 2a shows the relationships of each project to one another.) Description of Maplewood Creek Conditions found along the length of Maplewood Creek vary widely. The first part of the creek above the Cedar River is contained within a 900 foot long 72-inch diameter culvert. The creek reaches the north side of SR 169 and the Maplewood Golf Course at RM 0.2, and then crosses the golf course in a drainage ditch to meet the existing sediment ponds at RM 0.4 Along the golf course reach the creek banks are vegetated primarily with grasses and fortis typical of disturbed areas, and the reach is devoid of in-channel structure. The area has been landscaped and undergoes heavy use as part of the golf course. (Photos of this reach are included in the Wetland Delineation Report submitted with the Corps permit application.) Two existing sediment ponds are located above the golf course in the mouth of the ravine. Hillsides surrounding the ponds are wooded, but slopes east of the ponds are unstable and contribute large amounts of coarse sands and silts directly into the ponds. From the upstream sediment pond (RM 0.5 to the top of the plateau at RM 1.4), the stream is confined in a steep, heavily wooded ravine. Maplewood Creek generates a significant sediment load for a creek of its size. This sediment load adversely impacts downstream habitat, land uses, and property. The creek's primary source of sediment is the canyon that Maplewood Creek drops through (more than 300 feet vertically) from the Renton Plateau to the Cedar River. As the creek descends the ravine it cuts through highly erodible soils and transports those soils to the Cedar River floodplain. Above the golf course, the creek deposits those sediments in the two existing ponds. Once those ponds are filled to capacity with sediments (this currently occurs several Maplewood Creek Flooding and Habitat Improvement Projects Page 2 WPC\95PROJ\7163G\FLOOD14A6.DOC\01/23/96\9:03 AM\SDC Project Description for Corps Permit Application times a year), sediments are then transported down into the golf course reach where the sands and silts settle in the creek channel and downstream culvert under SR 169. The sediment reduces the system's conveyance capacity and chokes gravels that would otherwise be suitable for salmon spawning. Fisheries Information Use of Maplewood Creek by salmon and other anadromous fish is limited by the culvert system at the confluence of the creek and the Cedar River. The culvert's outfall blocks fish access to the creek except during high Cedar river flows. The old water supply dam at the downstream end of the upper sediment pond has also probably blocked anadromous fish use of upper Maplewood Creek since its construction, in about 1930. According to the Lower Cedar River Current and Future Conditions Report (King County, 1993), the lower portion of the ravine (RM 0.5-0.75) contains good habitat. Habitat in higher stream reaches (generally in the upper 0.2 miles of the ravine) is heavily affected by channel scour and lateral bank sliding. Most of the middle portion of the stream is under the control of the Maplewood Homeowners Association, which has worked to protect the area and its habitat. Despite the presence of the dam and the adverse conditions at the SR 169 culvert outfall, the Current and Future Conditions Report does identify Maplewood Creek as one of nine major fish-bearing tributaries along the Lower Mainstem Cedar River. Sockeye use of the creek is limited because of the poor habitat conditions found in the lower reaches. However, coho salmon use the lower 0.4 miles of the creek up to the outlet of the lower sediment retention pond. Cutthroat trout, which have been isolated above the sediment ponds, thrive in the ravine above the dams up to about RM 1.0. Hydrology and Flooding Both the City of Renton Draft Maplewood Creek Basin Plan (Parametrix, 1989) and the Lower Cedar River Current and Future Conditions Report (King County, 1993) used hydrologic models to estimate expected peak discharges from the basin for various storm events. The results presented in these reports are summarized in the table below: Maplewood Creek Flooding and Habitat Improvement Projects Page 3 WPC\95PROJ\7163G\FLOODHAB.DOC\01/23/96\9:03 AM\SDC Project Description for Corps Permit Application Expected Maplewood Creek Peak Discharges Based on Modeling Results Storm Event Recurrence Maplewood Creek Basin Plan Current and Future Conditions Interval (Yr) (HEC-1) Report (HSPF, 15 min. data) Current Future Current Future 2 118 173 59 132 10 202 275 104 207 25 251 333 135 257 100 300 392 197 349 The capacity of the golf course channel to convey Maplewood Creek flood flows to the Cedar River is limited by the size of the channel and the capacity of the downstream culvert system under SR 169. Sections of the existing golf course channel reach bankful capacity at 150(±) cfs. This is far less than the expected 100-year peak flow, estimated to be 200-300 cfs for existing land use conditions and 350-400 cfs for future conditions. As shown in the table above, most estimates of the expected peak flows predict that channel capacity will be exceeded with the 10-year event under existing land use conditions, and as frequently as the 2- year event under future conditions. Existing capacity of the downstream culvert system under SR 169 is also approximately 150 cfs, but with flooding of the Cedar River, the capacity of this system is probably reduced to about 100 cfs due to high tailwater conditions at the culvert outfall. Capacity of the system is further reduced by a combination of two factors: sedimentation and the presence of baffles installed in the 72-inch highway culvert to facilitate upstream fish passage. Large amounts of sediment from the ravine routinely escape the existing sediment ponds and settle in the golf course channel. Sediment has reduced the channel's slope and cross-sectional area, resulting in a reduction of the channel's conveyance capacity. Baffles in the 72-inch pipe reduce the pipe's capacity by reducing the cross-sectional area. The baffles also collect sediment. Due to flow resistance and sediment storage, the baffles have reduced the culvert's peak flow capacity significantly below its potential maximum. Flow reductions in the culvert also reduce flow velocities in the channel upstream and therefore encourage additional sediment deposition within the golf course reach. Relationship of the Proposals to Recent Planning Efforts Both the City of Renton Maplewood Creek Basin Plan (Parametrix, 1989) and the Draft Lower Cedar River Basin Plan (King County, 1995) include recommendations for stormwater Maplewood Creek Flooding and Habitat Improvement Projects Page 4 WPC\95PROJ\7163G\FLOODHAB.DOC\O1123196\9:03 AM\SDC Project Description for Corps Permit Application conveyance and sediment mitigation projects to improve flooding, sedimentation conditions, and fish habitat across the golf course. Both plans recommend reconstruction of the sediment ponds in combination with other improvements to stabilize the ravine. Both plans also recommend increasing the capacity of the channel across the golf course and the downstream culvert to reduce flooding. The Draft Lower Cedar River Basin Plan specifically proposes both the sediment pond reconstruction project and habitat improvements associated with the proposed low-flow fish passage channel. As discussed in the Basin Plan: "The improved sediment pond and stabilized stream banks would not only allow anadromous fish to pass to upstream reaches, it would reduce the frequency of sediment removal with its associated costs and habitat impacts. Enhancement of the reach within the golf course (RM 0.2 - 0.4) would encourage the use of the relatively good habitat of the Maplewood ravine by anadromous salmonids." The need for these projects was also addressed when the Washington State Department of Transportation (WSDOT) proposed widening of the highway and concurrent improvement of the Maplewood Creek culvert system (completed in 1995). The City of Renton asked WSDOT at that time to upgrade the culvert system under the highway to relieve flooding across the golf course. WSDOT proposed to remove the 4 inch x 4 inch timber baffles from the culvert, which could increase capacity of the culvert system to as much as 370 cfs (assuming no tailwater). In order to mitigate for impaired fish passage through the culvert, WSDOT proposed and built a fish ladder under SR 169. In turn, the City of Renton committed to build a low-flow fish passage channel across the golf course to connect the fish ladder with the City's planned sediment pond improvements above the golf course. WSDOT has agreed not to remove the baffles from the culvert until the City's low-flow channel is completed. III. Project Descriptions As introduced above, the proposal consists of three separate projects: the Maplewood Creek Low-Flow Fish Passage Channel Project, the Maplewood Creek Sedimentation Basin Reconstruction and Improvement Project, and the Maplewood Creek High Flow Capacity Improvements. The projects are described in more detail below and are shown schematically on Figure 2a. Maplewood Creek Flooding and Habitat Improvement Projects Page 5 WPC\95PR01\7163G\FLOODHAB.DOC\01/23/96\9:03 AM\SDC Project Description for Corps Permit Application Low-Flow Fish Passage Channel Project Introduction The proposed fish passage channel will extend from the downstream end of the proposed sediment pond (RM. 0.4), across the Maplewood Golf Course, to the existing (but unused) fish ladder that was constructed by WSDOT under SR 169 (RM 0.0)(Figure 2a). The outfall of the fish ladder would also be established as RM 0.0 because the low-flow channel to the fish ladder would bypass the existing 900-foot culvert. The project will improve habitat along the reach of the creek through the Maplewood Golf Course and, in combination with the improved sediment pond, will allow fish passage above the sediment pond for the first time since the 1930s. Additional engineering design information for this project is contained in the Draft Maplewood Creek Fish Passage Channel Riparian and Instream Habitat Report (Harza NW, 1995) (copy included with Corps permit application.) Information on the types of vegetation to be affected is provided in the enclosed Wetland Delineation Report. Proposed Project Elements Specific project elements include the following: • Excavation of an 1850 foot channel across the golf course. Maplewood Creek low flows would be diverted into the channel at the outlet of the sediment pond. The new channel would replace the existing channel for conveyance of low flows. The new channel will be shaped to provide a narrow baseflow channel within a broader trapezoidal channel (see Figure 3b). The overall channel will be sized to convey the design flow, with 1 to 2 feet of freeboard. The bottom of the channel will be lined 1 - 2 feet deep with a gravel/cobble matrix. The shape and specific location of the narrow baseflow channel will be determined by flow dynamics through the channel and the placement of in-stream habitat features, described below. • Installation of an impervious clay or geomembrane barrier under the channel. An impervious liner would be installed below the creek to prevent exfiltration loss of water from the creek into the alluvial soil matrix underlying the golf course. The liner will ensure that adequate baseflow remains in the channel to preserve fish habitat and allow passage through the reach. Maplewood Creek Flooding and Habitat Improvement Projects Page 6 WPC\95PR01\7163G\FLOODHAB.DOC\01/23/96\9:03 AM\SDC Project Description for Corps Permit Application • Placement of instream habitat features such as drop-logs, boulders, large woody debris (LWD), and spawning-suitable gravels. Habitat features will be included in the channel to provide cover and a diverse hydraulic environment. Logs and boulders will be used to form pools and, in certain locations, to avoid detrimental scour of channel banks. • Planting of vegetation in the channel that can both provide habitat structure for fish and an aesthetic complement to existing golf course landscaping. Construction of the proposed low-flow channel would not affect wetlands, but would convert approximately one acre of uplands that are now maintained as fairways, tees, greens, and cart paths to 0.34 acres of perennial stream and 0.68 acres of palustrine shrub wetland (see Figures 3a, 3b, and the enclosed wetland delineation report). In addition to improving flow capacity and maintaining appropriate depth and flow conditions for fish, the channel cross-sections are designed to allow for creation of palustrine shrub wetland. Species selected for planting include willow, dogwood, spiraea, twinberry, mock orange, Pacific ninebark and vine maple, located at appropriate elevations above the ordinary high water line. Overhanging vegetation will be included on channel banks to provide additional cover and aesthetic benefit. • Inclusion offish ladders in steep reaches below the proposed sediment pond. The fish ladders will facilitate movement of fish into and above the sediment pond. In stream reaches of 4-6 percent, this will be accomplished with drop logs and plunge pools. Just downstream of the sediment pond a concrete structure may be used to raise the creek above existing grades. Construction of the low-flow channel would produce an 1,850-foot sinuous channel with gravel substrate, significant vegetation and in-channel structure, stable banks, and sufficient capacity to pass the design flow (45 cfs) without flooding. The channel would be constructed using three standardized sections (see Figures 3a and 3b). Section A, for steep sections of the channel with an average slope of between 3 percent and 10 percent, would be of trapezoidal cross-section and would be an average of 20 feet wide, 4 feet deep, and have a 4-foot bottom width. Section B, for sections of the channel with average slopes of between 0.5 percent and 3 percent, would have a benched section with an overall width of about 26 feet, a low bottom width of 4 feet, a benched width of about 16 feet, and an overall depth of about 6 feet. Section C would be used at crossings of the golf course fairways. Section C would utilize half-sections of 4-foot diameter pipe. Steeper sections of Maplewood Creek Flooding and Habitat Improvement Projects Page 7 WPC\95PROJ\7163G\FLOODHAB.DOC\01/23/96\9:03 AM\SDC Project Description for Corps Permit Application the channel would use log drop structures to create pools and stabilize the channel substrate. All sections of the channel would utilize 12- to 24-inch boulders, large woody debris (LWD), 3 to 6 inch cobbles, and 1 to 2 inch gravel to provide instream structure and suitable substrate for salmonids. Flow conditions in the reach will be favorable for fish passage, spawning, and rearing. Flow velocities in the channel will vary between 0.15 fps at extreme low flow (1 cfs) to 4 fps at the maximum design flow (45 cfs). Flow depths will vary between 1 foot and 3 feet. (Note that these values represent average conditions, with areas of faster flow and slower flow). In- channel structures such as log weirs, boulders, and large woody debris will create complex flow conditions in the channel. With such features, and a moveable substrate, eddies, pools, riffles, and chutes, will be formed, especially in low to moderate flow conditions. Flow velocities during peak events should be sufficient to transport finer sediments through the channel reach and/or scour a large proportion of accumulated fine sediments from the gravel substrates. The channel would be constructed using an clay or geomembrane liner to prevent loss of baseflows into the sand and gravel aquifer that underlies the golf course. The top edge of the channel bank would be bermed to provide a 2 percent minimum slope away from the channel to reduce the potential for fertilizer or pesticide residues that maybe present from recent applications on golf course areas from entering the channel in stormwater runoff. Channel side slopes will be 2:1 minimum. Vegetation will be selected for the channel banks to provide shade and structural cover and to minimize required maintenance. Areas requiring ground cover will be hydroseeded with a mix of native seeds and wild flowers. Impacts Due to Construction No significant adverse impacts are anticipated due to construction. Creation of the new fish passage channel will provide mitigation for wetland impacts to the existing high flow channel and sedimentation basins, at an acreage compensation ratio of over 3:1. Construction of the low-flow channel is scheduled to occur in the spring or early summer. All construction areas will be isolated from Maplewood Creek and the Cedar River. No flows from Maplewood Creek will be diverted into the low-flow channel until construction is completed and disturbed areas have been stabilized. BMPs and erosion control techniques as described in the KCSWDM (silt fences, hay bales, etc.) will be implemented in order to prevent the generation and transport of turbidity to offsite or downstream areas. Connection of the low- Maplewood Creek Flooding and Habitat Improvement Projects Page 8 WPC\95PROJ\7163G\FLOODHAB.DOC\01/23/96\9:40 AM\SDC Project Description for Corps Permit Application flow channel to Maplewood Creek and the Cedar River would not occur until after the new sediment basin is completed Construction of the low-flow channel would require the excavation of up to 8,000 cubic yards of material from upland area on the golf course. Material that would not meet the specifications for the sediment pond berm fill would be hauled to an off-site location for proper disposal. Up to 1,600 cubic yards of bentonite clay (for the impervious liner) and 400 cubic yards of select cobble and gravels (for channel habitat substrate) would be imported to the site for the project. In total, about one acre would be disturbed by the construction and grading activity associated with the low-flow channel. Future Maintenance Minimal channel maintenance is expected to be required in the future. Vegetation may have to be pruned, the channel will require monitoring for scour and deposition of sediments, and removal of undesirable materials such as litter. Sedimentation Basin Reconstruction and Improvements Project Introduction The two existing ponds on lower Maplewood Creek within the golf course are owned by the City of Renton and maintained by the City of Renton Parks Department. The upper pond was an old 1930s irrigation diversion, built to support the original orchard which preceded construction of the golf course. The newer pond, located downstream and closer to the municipal golf course, was built for sediment control. However, the two ponds working together have proven to be inadequate for this purpose. In addition, the stability of the upper concrete dam is a concern. The facility has been damaged by floods, which have undermined the existing dam structures. Till embankments (60 to 70% slope) adjacent to the ponds are also a problem, as they slough into the ponds when undercut by storm flows. Reconstruction of the lower sediment pond qualified for FEMA Hazard Mitigation Grant Funds. Fifty percent of the sediment pond reconstruction costs will be funded by FEMA (Federal Emergency Management Agency), 25 percent by WDCTED (Washington Department of Community, Trade, and Economic Development) and 25 percent by the City of Renton. The project reach for sediment pond reconstruction would be the area of the existing sediment ponds between RM 0.4 and 0.5 (see Figure 5). The lower dam will be replaced by a Maplewood Creek Flooding and Habitat Improvement Projects Page 9 WPC\95PRO1\7163G\PLOODHAB.DOC\01/23/96\9:03 AM\SDC Project Description for Corps Permit Application flood diversion structure and fish ladder. This project is described in detail in the Maplewood Creek Sedimentation Basin Reconstruction and Improvement Project Phase I Design Report (Harza Northwest, 1994) (copy included with Corps permit application). In general, the project would include excavation and replacement of a total of up to 7,000 cubic yards of materials. This includes removal of accumulated sediments from behind the upper concrete dam, stabilization of slopes adjacent to the creek, and the removal and reconstruction of the retaining berm for the sediment pond. The enclosed Wetland Delineation Report provides more detailed information on the types of vegetation to be affected by this work. As noted previously, wetlands in these areas do not meet the City's definition of wetlands, because they are maintained for the purposes of stormwater management. Proposed Project Elements The proposed project involves reconstructing and improving the existing sedimentation ponds on Maplewood Creek near the golf course. This reconstruction will create a larger storage volume for sediment and debris. Enlargement of the pond, together with the construction of new outlet controls, will enable the facility to trap fine-grained sediments. The new basin will have a sediment storage capacity nearly three times that of the existing facility. The existing access road running along the west side of the basin and creek will be improved with a new gravel road surface. It is anticipated that up to 1,000 cubic yards of material would be removed from behind the upper concrete dam. A majority of the concrete dam would be removed (notched) after the sediments have been removed. A sill will be established in the old dam about a foot below the proposed stream grade. The notch will be 10 feet wide at the bottom. The sides of the notch will extend up to the top of the dam at a 1:1 (45 degree) angle. Stabilization of potentially unstable slopes adjacent to the upper concrete dam would require excavation of about 250 cubic yards of material from the toe of the slopes. The excavated material would be replaced with about 200 cubic yards of specialized fill, such as 12- to 30-inch rock and or riprap. Special fill material would come from special off-site quarry sources. Construction of the new sedimentation basin would involve excavation of up to 3,500 cubic yards of material from the existing sediment pond and the northernmost portion of a parking lot which exists immediately south of the pond. Approximately 3,000 cubic yards of material would then be placed for the downstream berm to contain the reconstructed sediment Maplewood Creek Flooding and Habitat Improvement Projects Page 10 WPC\95PRO1\71636\FLOODHAB.DOC\0123/96\9:03 AM\SDC Project Description for Corps Permit Application basin. Portions of the previously excavated material which meets the design specification for the berm fill would be reused. The remaining fill, would be imported to the site. Excavated material which cannot be reused for reconstruction of the pond would either be used on the site for golf course landscaping, or hauled to an off-site location for proper disposal. After construction, the sedimentation basin would have sufficient storage capacity to hold the total sediment load that would be expected to be delivered to the facility over a 1-year period. Vegetation that will be affected by slope stabilization activities at the upper concrete dam is primarily swordfern and Himalayan blackberry. A few small-diameter (2 to 6 inch) alder and western hemlock trees may be removed. The area that would be disturbed includes approximately 0.06 acres on the east bank, where the slope will be graded back and stabilized with rip-rap. An area just downstream of the existing dam will be treated similarly, affecting 0.04 acres of upland vegetation. Herbaceous wetland vegetation that has established on recently deposited sands and gravels in the pond will be removed. Vegetation that will be affected at the lower sediment pond includes upland shrub and fern species on the east bank (primarily Himalayan blackberry and swordfern); herbaceous wetland species on recently deposited silt, sands, and gravels within the ordinary high water mark (reed canary grass and creeping buttercup); and a mix of upland and wetland plants on the dike (common and giant horsetail, thistle, mullein, dandelion, clovers, hairy cat's ear). A few small-diameter (2 to 6 inch) alder, Douglas fir and western hemlock trees may be removed during construction of the new fishway abutment. The total area disturbed is expected to be approximately 0.16 acres, which includes upland forbs and grasses along the access road and paved parking area. Native and native hybrid shrub species are proposed for landscaping, with a grass/wildflower mix for erosion control. Two small slide areas (one on the east bank of the upper concrete dam and one just downstream of the dam) would be repaired using rip-rap joint-planted with willow and dogwood cuttings to improve stability and provide palustrine shrub wetland. The west and south margins of the expanded lower sediment pond would also be planted with willow and dogwood cuttings, and rooted stock of Pacific ninebark and Nootka rose at higher elevations. Gradual slopes at the upper end of the pond on the west bank will allow for planting of emergent wetland species in shallow water and saturated soils. A mix of burreed, rush and sedges are proposed for a small area that would be affected by construction of the maintenance ramp into the pond. Maplewood Creek Flooding and Habitat Improvement Projects Page I l WPC\95PRO1\7163G\FLOODHAR.DOC\OI/23/96\9:03 AM\SDC Project Description for Corps Permit Application Specific features of the new sediment basin would include the following: • Reconstruction and expansion of the existing sedimentation basin with an outflow weir to provide for fish passage (Figures 4a and 4b). The new basin will have a pool surface area of approximately 12,000 square feet and a volume of 1,300 cubic yards. It is expected to capture a larger portion of fine sand, and trap efficiency should increase from an existing 25 percent to 50 percent, or 600 cubic yards. The pond and channel construction may involve up to 4,000 cubic yards (CY) of excavation and recompacted fill. • Construction of a rectangular bathtub overflow spillway (Figure 5), a 24-foot long by 12-foot-wide reinforced concrete structure. It is estimated that the frequency of water flowing over the main spillway will be approximately 7 days per year on average, primarily during the winter high flow months. A concrete outlet pipe, 30 feet long and 72 inches in diameter will be connected to the spillway. Excessive hydraulic energy of the flows will be dissipated within the spillway, pipe and outlet structural system. • Construction of a fishway outlet on the west side of the sedimentation basin embankment (Figure 6). This structure would direct water to the future low-flow fish passage channel. Two concrete weirs would be connected by a 32-foot-long by 42-inch-diameter concrete pipe buried under the dam embankment. • Construction of a maintenance bypass pipe (300 feet long by 12 inches diameter), including a small inlet and gate structure, will be buried along the west side of the sedimentation basin and access road. This bypass pipe will be used to temporarily divert water from the sedimentation basin when sediment is being removed from the basin for maintenance purposes. Sediment removal may take one to two weeks during the summer. This bypass pipe may also be used to divert flows around the pond during the reconstruction work. • Notching of the existing upstream concrete dam 500 feet upstream of the lower sedimentation pond, and removal of accumulated sediments upstream of this dam. The banks along this stretch, 60 feet from the dam, will be secured by riprap. These improvements will facilitate anadromous fish passage into the upper creek area. Fish passage is now prevented by the dam. Maplewood Creek Flooding and Habitat Improvement Projects Page 12 WPC\95PR01\7163G\FLOODHAB.DOC\01/23/96\9:03 AM\SDC Project Description for Corps Permit Application • Improvement of the existing access road along the west side of the existing sediment pond. The 10- to 12-foot wide roadway will be stabilized and then resurfaced with crushed rock. Impacts Due to Construction Although wetlands in the sediment pond areas do not meet the City's definition of wetlands, mitigation will be needed to meet Corps. requirements. Notching and excavation behind the upstream dam will affect 0.05 acres of recently-developed palustrine emergent wetland and 0.02 acres of perennial stream. After construction, approximately 0.06 acres of palustrine shrub will be planted to help stabilize the bank on the east side of the pond. Improvement of the lower sediment pond will involve excavation of 0.06 acres of existing pond, and removal of 0.03 acres of palustrine emergent vegetation. These losses will be compensated by expansion of the pond to 0.28 acres of open water, with 0.07 acres of palustrine emergent and palustrine shrub plantings. Reconstruction of the sediment pond would probably occur in the late summer or early fall fisheries construction window. Expansion of the pond would affect minimal upland area, an existing access road to the west and an existing parking lot to the south. During construction, all flows would be routed around the area where work is taking place. BMPs and erosion control techniques as described in the KCSWDM (silt fences, haybales, etc.) will be implemented in order to prevent erosion-induced sediment generation and transport to downstream areas. Future Maintenance The new basin will trap particles coarser than about 0.1 to 0.2 mm diameter. It is estimated that the trap efficiency of the new basin will increase to 40 to 50 percent and will trap 500 to 600 cubic yards of sediment annually. Based on the proposed basin configuration, the trapped sediments should consist primarily of gravel and sand which will be readily dewatered. Small amounts of coarse silt and clay (less than 10 percent) should have no real effect on large scale dewatering. In order to retain the optimum settling characteristics in the basin, at least 2 feet of water depth should be provided for settling during high flow events when the basin pool level reaches the proposed spillway crest at El. 109. This means that the basin floor should be deeper than 107 feet at all times. If the basin is designed with a bottom elevation of 105 feet, Maplewood Creek Flooding and Habitat Improvement Projects Page 13 WPC\95PRO1\7163G\FLOODHAB.DOC\01/23/96\9:03 AM\SDC Project Description for Corps Permit Application this will allow 600 CY of the total 1,300 CY to act as sediment storage volume and will require cleaning on an average of once a year. If less frequent cleaning is desired, the bottom elevation could be cleaned to 104 feet to provide a total of 900 CY of storage. (Note: all of the 1,300 cubic feet of available storage would not be used so that some amount of freeboard is maintained). As with the present basin, depending upon the storm frequency and intensity, the basin may need to be cleaned after a single large storm, or may not require cleaning for several years if there are no high flow events. The City will coordinate the timing of maintenance activities with WDFW so that impacts on fish would be avoided or minimized, much as it does under current conditions. Maplewood Creek High-Flow Capacity Improvements Introduction High Flow Capacity Improvements are not currently scheduled for construction, but are included as part of the overall plan for improvements to the system. The High Flow Improvements may be constructed in the future when funds are available. The proposed high- flow capacity improvements would extend from the outlet of the reconstructed sediment basin to the inlet of the existing culvert system under SR 169 (that portion of the existing Maplewood Creek channel between RM 0.1 and 0.4). The improvements would provide sufficient capacity to convey flows greater than baseflow (> 20 cfs) up to the anticipated 100- year storm event flow (392 cfs) with freeboard. The high-flow channel would be designed to convey storm-related flows across the golf course to the Cedar River. In general, the alignment of the high flow capacity improvements would be the same as that of the existing creek channel (see Figure 7). The channel will be widened to handle higher flows with 1 to 2 feet of freeboard. Currently, the channel width varies between approximately 12 feet and 18 feet. The proposed improvements will result in widening the upper end of the channel from approximately 12 feet to approximately 24 feet. The width will increase from approximately 18 feet to approximately 40 feet at the lower end, where it might be combined with the golf course fairway. The width of the middle section of the channel will increase from approximately 18 feet wide to approximately 34 feet wide. Side-slopes along the entire channel would be sloped a minimum of 3:1. Overall, grading and earth moving to widen the channel would affect up to 1 acre of the golf course and require the handling of up to 3,000 cubic yards of material. All materials would either be disposed of on-site as part of Maplewood Creek Flooding and Habitat Improvement Projects Page 14 WPC\95PR01\7163G\FLOODHAB.DOC\01/23/96\9:03 AM\SDC Project Description for Corps Permit Application ongoing landscaping activities at the golf course or removed by the contractor to a commercial disposal site.. Vegetation along the creek that would be removed due to construction is currently affected by regular maintenance (mowing), the addition of quarry spalls to stabilize sloughing banks, and scouring and deposition of sediments during flood events. Within the riparian zone, Himalayan blackberry, reed canary grass, turf grasses, creeping buttercup and smartweed predominate, with scattered soft rush and small-fruited bulrush, and a few alder seedlings and saplings. (Photos of portions of the existing Maplewood Creek Channel are included in the Wetland Delineation Report submitted with the Corps permit application.) Approximately 0.17 acres of wetland vegetation and no more than 0.69 acres of adjacent upland (existing golf course features, such as fairways and cart paths) would be affected by construction of the high-flow channel. The high-flow channel would be graded and landscaped to be consistent with golf course fairway areas. Side slopes would be gradual, allowing easy maintenance such as mowing. Impacts Due to Construction Diversion of water and recontouring of the existing channelized creek will affect approximately 0.09 acres of perennial stream and 0.17 acres of disturbed palustrine emergent wetlands. These impacts will be compensated by creation of the new low-flow channel, including approximately 0.34 acres of perennial stream, and 0.68 acres of palustrine shrub wetland. Construction of the high-flow channel would probably occur in the late summer or early fall fisheries construction window, when no water would be flowing through the high flow channel. BMPs and erosion control techniques as described in the KCSWDM (silt fences, haybales, etc.) will be implemented in order to prevent the generation and transport of turbidity to downstream areas. Future Maintenance Minimal maintenance is expected to be required for the channel. Vegetation may have to be pruned, and the channel will require monitoring for scour and deposition of sediments, and removal of undesirable materials such as litter. Maplewood Creek Flooding and Habitat Improvement Projects Page 15 WPC\95PROJ\7163G\FLOODHAB.DOC\01/23/96\9:03 AM\SDC Project Description for Corps Permit Application IV. Benefits The projects discussed herein would work together to increase the capacity of the Maplewood Creek drainage system across the golf course, to prevent flooding and reduce related property damage and maintenance costs, while also mitigating existing adverse sediment transport conditions and providing higher quality habitat for use by anadromous fish. The low-flow channel would permanently convey Maplewood Creek low flows to the Cedar River and allow upstream fish migration past the existing 900-foot SR 169 culvert via the WSDOT fish ladder. It would also create approximately 0.68 acres of palustrine shrub wetland, providing new forage cover and nesting habitat for songbirds, small mammals, reptiles and amphibians. Capacity of the low-flow channel would be limited to about 45 cfs (the maximum flow capacity of the fish ladder). Flows into the low- and high-flow channels would be regulated by improved weir outlet structures from the new sedimentation basin. The new outlet structures would be designed to enable the reconstructed sediment basin to capture and store a much higher portion of the suspended and bedload sediment from the creek than can be handled by the existing facility. By preventing more sediment from reaching the downstream channels, habitat and conveyance capacity along those reaches would be preserved. Sediment pond reconstruction would also stabilize the failing slopes south of the pond and reduce a source of sediment input at that location. The capacity of the existing Maplewood Creek channel would be increased to accept higher flows of up to 392 cfs through the proposed high-flow capacity improvements. However, flows would be directed down the high-flow channel only during storm events. V. Impacts The projects would affect approximately 0.42 acres of wetlands. The projects would compensate for this impact by creating approximately 1.45 acres of wetlands with higher values than currently exist, at a compensation ratio of over 3:1. It is anticipated that the proposed mitigation, which will be initiated on-site, will be adequate to satisfy Corps requirements. Construction of the projects would be sequenced to avoid adverse impacts to fisheries resources in Maplewood Creek and the Cedar River, and to take advantage of seasonal reductions in golf course play. The low-flow channel would be built entirely in upland area that is currently part of the golf course. The low-flow channel would connect to the existing fish ladder on the north side Maplewood Creek Flooding and Habitat Improvement Projects Page 16 WPC\95PR01\7163G\FLOODHAB.DOC\01/23/96\9:03 AM\SDC Project Description for Corps Permit Application of SR 169 and to the new sedimentation basin via a second, smaller fish ladder to be located on the south side of the new basin. Construction of the fish passage channel may occur in the spring or early summer of 1996. Proper erosion and sedimentation controls would be provided to prevent the discharge of eroded sediments to either Maplewood Creek or to the Cedar River from the construction site. (A Shoreline Substantial Development Permit will be required for the proposal because the connection to the fish ladder would be located within 200 feet of the Cedar River.) No impact to fisheries or other resources in the Cedar River is expected from this diversion because the outfall of the fish ladder is located within 20 feet of the outfall of the existing SR 169 culvert. Construction of the Sediment Basin Reconstruction and Improvement Project would probably not begin until after June 1996, and would be completed during the fisheries construction window (or other approved time period). During construction Maplewood Creek would be diverted around the construction area and would be directed into the existing channel across the golf course. After the new basin is completed, base flow would permanently be directed to the low flow passage channel. The Sediment Basin Reconstruction and Improvement and High-Flow Capacity Improvement Projects would be constructed within low-quality riparian areas that are adjacent to the existing ponds and the golf course channel. The table below shows the area of each type of wetland that would be affected by the project. Effects of the Project on Wetlands Type Existing Acres Future Acres Open water 0.06 0.28 Perennial stream 0.11 0.36 Palustrine emergent 0.25 0.02 Palustrine shrub 0.00 0.79 Total 0.42 1.45 Existing banks of the sediment pond and lower channel (through the course) are currently impacted by regular maintenance activities, by disturbance due to mass-wasting (in the area of steep slopes adjacent to the pond), sediment deposition, scour, and bank sloughing, and wetland functions are significantly impaired. Minor expansion of the sediment pond to the west would be into an area that is currently used as an access road along the edge of the existing ponds. Expansion of the pond to the south would be into an existing parking lot. 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N BSt Z5 St„s E,•SS` c > o7P E 15 S, 5 i112 St w ^ " IE 5 St OY. o n " ewQ Ot >S' c p` a - �Im ,. psi I > > , St SE a ^i a-.,< g ' 3 Y 15R [y� 4q e ;' L ES/J,cW1�tBIY 5i r 51 < Stt651 NE tOS w ; 5 tt8 S+1H 51t `ft 17<i5, 51i7 St 116% aj ;' %zW > Nn N 91n 1 2KnrwY i ,{651<',� - '651 < SI 6St E$ 7P� Z (jpEING COMPANY t z T .o v < S tS, lyef e l y 120 N Btn 7M < ' S1 Tcf"ir � 4• S r 0 hnt S ,2151 e6 1 Q w '16' (` < !F, ` m r 2 NE 7th St St22 St i r<'TnSt > i�d s,z] 3r ,-% ' Ti N Rento 5 12a S1 S iNSII ES S t 2. _ z z z ` E 3 <N aet 51 W • , \� dr ` -S> < St2s St Z = >�i SE126S,1 SE 129 St Rantm N t ,.51 i. ♦ Ng S a } ` Renton IaeY,Kn /j O,p„pa i NE Ith SI nl st - < Municipal a �" wr•tg Wg1Q1O1'"1' 1 - s+< ,L�P�r N I 'q„�`3CC _�A cJ'" NE]ma >lT�� _ t K:U - N Wty S n96tOn E,n lS't " 6 N - ep t =e Z2 Q SE q SI 132 - 5 arc n ` [ >_ a •]slvi - ` S171 St pl, IqM 3 S i`t' E Mr pvx Cem M% < lee A,6 • S� ,35', s'],. iRe y sw S �Rs, i 4 • S R ] %%E•Mst H 5^( �5> s_j H \or Sk,,6,R, R6Mon scn > Myy /sy 169 S d E J y 4i - E i �r la +'� ` � `si 'S71t S � >E•.2:,�'<�-Iar-�a /C M E! / C S d S 11J S/ S 7M st Blaclt to 'H c i3 Car"6f7CIe Rivers ,,➢, s 1i " PROJECT SITE4b, 6` Y � A■{(i �SE S GA > S , SE t6A neaM i !s SN\ Swt9St E 6A iN F Maplewood Ellt ,bwJ i4 :1 4� Ia 2181 1; d s, Z�LONGACRES W W _ d! •se 5: werM R..V r— S ]St ' Ct iE t60 S+ V� d CaNJe1 A SE'St S+ 80> n E 559 c i 1t d (CO/r CI FrdN1Ya,` to < u E51'MI1R JRS > 162 t � �,, a ,57 atia /,C'S'/` •'p _ 'E'S2 191 W SE t6]St � N \ v, Z CascadeF SE R rvP1A ryd titr�'< 1" + t� ;# •N �; <' t i 1� a\ t66 St -E s585t 827 A - 1 �., - ` -5 a a•, 1 > yl .;+L't1 \�.' ��5 it ) alb IJwigv ;r-�..� I, 1A•/mil �:.'R10f'0- �N�. i lb�� I N t I I SOURCE:King of the Road Map Service Inc. Bellevue City Map 1 MILE Figure la Project Vicinity Map Lower Maplewood Creek Flooding and Habitat Improvement Projects Corps of Engineers Permit Application ■ 406 • ,I 1 • ` 11 West Branch 40 A • • ••• •• •✓ . East Branch •• •• - \+ A .• - GO A Maplewood Creek �-�Q� t� • • • ••• 1/Upper Dam • .. •...� ••• ••• i (RM 0.5) tt •.• Existing Sedimentation • - - Basin (RM 0.4) 41 � CEDAR . �ol ` f C'Ovrse _ - � � � 1?ate• � 0 4 0 fp C ' -o • • • . \ Rp � J� ` \ •♦ • • • ��•• �� UT E 169 • \ i�O • t • • • /1 • I I N SOURCE: U.S.G.S. RENTON SHEET, 1:24,000 Latitude= 122409'15" 1000, Longitude=47128'06" Figure lb Project Vicinity Map Lower Maplewood Creek Flooding and Habitat Improvement Projects o � L — — — 1623059126 1623059022 _ I COMMON PROPERTY TYPE II � � (D �--•— — — — — — — K 1623059065 � ( 1523059169 I UPPER SEDIMENT POND `�- 5126900280 O .,:.,/ p, �eFr� 1623059018 = y 51269OP70 � 1523059014 CD • .�, EXISTING CONCRETE l \� EXISTING CONCRETE DAM TO BE REMpVED �/• DAM TO BE NOTCHED' 5126900355 \ \ ! -• %J// Sf. S •.' ;�, t /i EXISTING SEDIMENT POND A� ~ �� PROPOSED FlSH LADDER I p(A� 5 Q0435.. .. fi / r \ I ....._..........� ll t ENT T• PROPOSED IMPROVEM S TO SEDIMENT POND 512700210 EXISTING PARKING LOT CY �51 6900410 i EXISTING BNGABAUBOOUSE 512700200/ x i '� { ►fi 0 BE REMOVED) Ci 523059088 _.__.......__._..._ —22-23 05-90 9.0— . — I— • —. — O—N TY— PE II OM 2123050_3, 2223059069 _......_......_............._...._ Ow CCD 5126900500 2223059008 (D \ x` i "y%\-`, �" FISH R PASPROPOSED LOW-FLOW I LEGEND b / �'� '")\� •� _ ® �, { �I;;;,fi! J����\ 2223059010 TAX PARCEL NUMBER IN. <'.. 4 's �• ' ';� k CRIEEK ALIGNMENT STING OOD O (D (_i® ('y I � ,�a\ f,,, (PROPOSED HIGH-FLOW y '•� _ '+•� - y` ;I , = r l4 ''•,.i CAPACITY IMPROVEMENTS) 'b •\.. i.'K�` .\ • A,A R �';' PROPOSED LOW-FLOW O FISH PASSAGE CHANNEL 1fn i I - Y EXISTING MAPLEWOOD hj v_ \\ r•.L• .._ \ \`�` A 11r r�`r,!1J, t l `.CREEK � `�� ;` •\ "� ••` t � '.�,�:,',?,) EXISTING GOLF COURSE GREENS � \`` ���� �:�,\ \ 2223059010 1! EXISTING TREES C�'r 8 \ �� ., :L�• / \•\ ....1 \ y•i / N'�• •) _ ,I PROPOSED BRIDGE (TYPICAL) b n EXISTING WSDOT J�C ��` 9 •\ �� %, EXISTING CONTOURS y�y n FISH LADDER `•� �'°'" •\ 1 / (2.0 FT INTERVALS) c� ��, •, / PROPOSED HIGH-FLOW 1-•�. `,`( \ •� CAPACITY IMPROVEMENTS fi i � •,i �,, •\ / `v Vi 300 0 300 J7• I 2223059026 NOTE: b Frl ] SEE FIGURE 2b FOR NAMES, ADDRESSES , AND PHONE NUMBERS OF TAXPAYERS/ (�1 F••-+ �. soot. m F«e '\ OWNERS BY PARCEL NUMBER. (� Corps of Engineers Permit Application NOTE: Parcel locations are shown on Figure 2a. Parcel Taxpaper or Owner 1523059088 Beulah E. McCarty 2223059090 4012 Maple Valley Hwy Renton, WA 98055 (206) 255-5519 1523059014 City of Renton 1523059169 Parks Department 1623059065 200 Mill Avenue South 2123059023 Renton, WA 98055 2223059010 (206) 277-5549 1623059018 City of Renton 1623059126 Finance Department 200 Mill Avenue South Renton, WA 98055 (206) 235-2558 1623059022 West Coast Management Inc. Sunnydale Mobile Home Park 5339 Prospect Road#261 San Jose, CA 95129 2223059026 Burlington Northern Railroad Property Tax Department 777 Main Street#1206 Fort Worth, TX 76102 2223059069 Philip Charboneau 14636 SE Jones Place Renton, WA 98055 (206) 432-1466 5126900280 A M Rhodes 3624 SE 5th Street Renton,WA 98055 (206) 255-6689 5126900355 Jeffery D. &Dawn M. Van Keulen 3624 SE 5th Place Renton, WA 98055 (206) 255-5384 Figure 2b Adjacent Property Ownership Information Lower Maplewood Creek Flooding and Habitat Improvement Projects Corps of Engineers Permit Application Parcel Taxpaper or Owner 5126900370 Eileen M. & Timothy A. Bishop 3629 SE 5th Street Renton, WA 98058 5126900410 John H. Seaquist 111 SW Victoria Street Renton, WA 98005 5126900435 Douglas R. Horvth 512 NE 71st Seattle, WA 5126900500 Steven E. &Elaine D. DeForrest 3705 SE 6th Street Renton, WA 98057 5127000200 Lawrence Vickers 13419 SE 141 st Renton, WA 98055 (206) 255-7592 5127000210 David M. Yamamoto 13420 SE 141 st Renton, WA 98055 Common Property Type II Liz Menzel, President Maplewood Heights Homeowners Assoc. 13803 SE 144th Street Renton, WA 98059 SR 169 Washington Department of Transportation Attn: Real Estate Services P.O. Box 47300 Olympia, WA 98504-7300 (360) 705-7000 Figure 2b Adjacent Property Ownership Information Lower Maplewood Creek Flooding and Habitat Improvement Projects Corps of Engineers Permit Application Sediment Pond existing wooded slope ♦ • . G8 ton A FB W. - •._.r • F6 ■ • • • • • G3 • Sectlon f5 .. • - \ t T4 • ■ F4 ', ction C G2 F2 Section B Fl Section C .. -,- . . . ■ • N i*a western red cedor ❑ tall-growing native Maroc Scar: e grrr oplee.Oregon grape. low-growing native 200' �1$ Podfic ninebork,mock orange, willow, hybrid black twneberry group turf grasses • con Path ♦Alternate Cart Path Figure 3a Low-Flow Fish Passage Channel Conceptual Planting Design Plan View Lower Maplewood Creek Flooding and Habitat Improvement Projects Corps of Engineers Permit Application 1 20'MIN. EXIST.GRADE SLOPE 2%MIN. iSLOPE 2%MIN. TO EXIST.GRADE H TO EXIST.GRADE r•' 4' o _ 4'- 3"-6"TOP501L LOG DROP 5TRUCTURE &HYDROSEED 3'-6"COBBLE IMPERVI05 CLAY LINER 12"-24"BOULDER 1"-2"GRAVEL 5ECTION A 26 MIN. 6' 3' 10, 3' 6' EXIST.GRADE SLOPE 2%MIN. SLOPE 2%MIN. TO EXIST.GRADE TO EXIST.GRADE 3' i 1.0' � 3"-6"TOP501L 4 &HYDR05EE0 12"-24"BOULDER IMPERVIOUS CLAY LINER 3'-6"COBBLE LWO INSTALLED 1"-2"GRAVEL IN CHANNEL 5ECTION B —12'MIN. SLOPE 2%MIN. SLOPE 2%MIN. TO EXIST.GRADE H 2 HTO EX15T.GRADE 1'V 3"-6"TOP501L&HYDR05EED 4• 1/2 4'PIPE 5ECTION C Figure 3b Low-Flow Fish Passage Channel Section Views of Channel Design Lower Maplewood Creek Flooding and Habitat Improvement Projects Corps of Engineers Permit Application CL ACCESS ROAD AND 12.0 / ADS N-12 BYPASS PIPE BYPASS PIPE INLET 12'MIN. DAM CREST (MIN.PIPE SLOPE I) / / SEE FIG.8 EL 111.5 � ��`110 y� l� DOWNSTREAM I. / \ �1 UPSTREAM SIDE //�1 1 I \\ SIDE EXISTING ACCESS ® / © T N(E) © n ROAD TO BE IMPROVED SEE NOTE 1,FIG.4D \ / \ / / / J ALL FILL COMPACTED MAXIMUM DRY DENSITY AND COMPACTED FRpI OPTIMUM MOISTURE VARIES FILL OFFSITE CONTENT TO PLUS 27G MATERIALS / ©�LOCALLY DERIVED TYPICAL SECTION FILL / SCALE: 1'-10'(HORIZ.AND VERT.) BY X LG ADS HEAVY / DUTY PERFORATED DRAIN - / y\/ PIPE SEE DETAIL 2,FIG.6 SLOPE TO BE REVEGETATED WITH Aj/ MIX OF EROSION CONTROL GRASSES AND NATIVE SHRUBS(TYP.) _�iA // / •- __ DAM CREST 11 111.5 SEE TYPICAL DAM SECTION / / / EXISTING Rb WOOD / f PIPE TO BE REMOVED F FlSHWAY OUTLET / SEE FIG.6 EXISTING 8'0 METAL PIPE TO BE REMOVED E 12.0 ADS N-12 BYPASS PIPE - L J/-J - / EXISTING 4'0 PVC PIPE TO BE REMOVED q FUTURE FISHWAY A,q CHANNEL N EL 108 JO' COTTONWOOD l � I A REMOVE EXISTING tuPE� /�� r `2 BO TOM EL 105.0 IRRIGATION INLET /V j N MAL POOL AND PIPE UPSTREAM OF NEW INLET f x1" DI NARY A $ MAPLEwArER) / EXISTING CONCRETE WEIR TO BE REMOVED DGE OF EXISTING a'ePAVEMENT: - 1: EXISTING RIPRAP TO BE REMOVED 101 AMEX, /� / t � ,' NEW INLET TO EXISTING /�\� IRRIGATION PIPE SPILLWAY AND / 4 _ TLET SEE FIG.5 APPROXIMATE LOCATION OF EXISTING IRRIGATION q REMOVE EXISTING PAVEIAENT, PIPE 1' CED. SEWER LIH,PIPE AND TRENCH MATERIAL FROM BASIN AND '� O2 NDER OAM. CUT AND No PIPE \\\,, IO2 / / 'o' // ORDINARY HIGH EWATER NT RLINE El EDGE OF EXISTING PA TE�._ IMPROVED SEDIMENT POND � �_ / /• ORDINARY HIGH WATER LINE m / SCALE 0 25 50 FEET 1" = 50' —EDGE GF E I' G BL LLC.IIG T'— Figure 4a Proposed Sedimentation Basin Improvements Site Plan and Sections Lower Maplewood Creek Flooding and Habitat Improvement Projects Corps of Engineers Permit Application CENTER NOTCH SECTION OF UPPER 120'LG SEDIMENTATION ZONE CONCRETE DAM TO BE REMOVED AT REMOVE ACCUMULATED SEDIMENT ELEVATION LEAST TO EL.122.5 OR ONE FOOT PRIOR TO 0�'�••-••• BELOW DOWNSTREAM GRADE OF CREEK - SCOUR ZONE BOTTOM ---_��___130 _________ ____ 120 A — A LONGITUDINAL PROFILE AT MAPLEWOOD CREEK ACROSS UPPER CONCRETE DAM SCALE: 1" 20'H 110 1"�10 V 4 MAN ROCK 24'-30-DIA. 4_ TO!EOF 2 MAN ROCK 12'-18"DIA r TH OF REPAIR TION-70 FEET EH OF REPAR SECTION-60 FEET OF SLIDE VALL IRE-60BEDDI M R�OCIWt15WCUB C WARDS OF IRE 40 ROCK,30 IC YARDS OF B — B 2 MAN ROCK; 10 CUBIC YARDS OF AN ROCK,20 CRUSHED ROCK(2-RICH). IC YARDS OF SCALE. 1' 10 CHANNELSHED ROCK MINOR RESHAPING OF UPPER NtO7HNCH).SLOPE AND DISPOSAL OFVEGETATION AND SURFACEAPED SLOPE SOIL. REWIRE EXCAVATION AND DISPOSAL OF 25 C — C CUBIC YARDS OF END OF EXISTING ACCESS SCALE; 1"-10' VEGETATION AND ROAD TO BE IMPROVED. SURFACE SOILS. SEE NOTE 1 A-4 MAN ROCK 24-30"DIA. 2 MAN ROCK 12'-18'DIA SILT TO BE REMOVED BEFORE C-RESHAPE SLOPE REMOVING CONCRETE DAM — 0-REMOVE ACCUMULATED SECTION ,./ SEDIMENTS CENTER NOTON SECTION OF EXISTING CONCRETE DAM TO BE REMOVED.NOTCH SECTION - I O ISODUANTITIES STATED ARE 45'CUT MIN. UT10'BOTH SIDES BOTTOM WIDTH AT 'yl / FOR ENGINEERING ESTIMATE ONLY AND NOT TO BE USED FOR BIDDING PURPOSES. / CONTRACTORS MUST SIZE TO S OF 2'TO 3' .f / OUANTITY PREPARE IESTIMAATES. B T SIZE 70 E PLACED ON / CREEK BOTTOM AT 8' TO SPACING(TYP.) \ FROM UPSTREAM END OF THE SEDIMENTATION BASIN / `' HEMLD�K TO 100'UPSTREAM OF THE UPPER DAM 11APLE EDGE OF EXISTING / / i ..-!�� ACCESS ROAD(TYP77�.) / 12 %IAPLE �.iy`AAFLE 4 n 9,1k, /. `f SCALE 0 25 50 FEET I I I NOTE 16 1" - 50' 1. ACCESS ROAD SURFACE TO BE 4" DEEP 7/8" CRUSHED ROCK ROLLED ON A CROWNED EARTH SURFACE FOR A MINIMUM ROAD WIDTH 12'. 2. EXCAVATE TO RESHAPE THE SLOPE. QSLOPE TO BE OVER EXCAVATED, REPLACE WITH ROCKERY AND RIPRAP WITH GRAVEL DRAIN. Figure 4b Proposed Sedimentation Basin Improvements Site Plan and Sections (cont.) Lower Maplewood Creek Flooding and Habitat Improvement Projects F:\..\t.wW\)twl\/tu3BW2.[twl: t..atN w(1>/ly/'3� r L.1...niiJ.i nw i . ii.tt.i t/.t/'.•r_..i..1 I' e'EMERGENCY C O GRAIN CATS JOINT TO MATCH FD 72'o PIPE END cT"p.a F� D D cD o. CL SPILLWAY f 72'4 OUTLET PIPE ct �np (D i' 9S' 1'-0'SLOT � O 8'SUBDRAIN F O GATE PLAN a 5' as 26'-0' 5'-0' 12'-0" e'-o' a 8'FLAT BACK UGHT DUTY SLUICE GATE PROVIDE TEE 14'-0' HANDLE FOR GATE OPERATION �• EL.111.5 100 YR.FLOOD MAX. �E DAM CREST EL 111.5 DAM CREST EL.111.5 POOL EL 110.5 �11 ►� SPILLWAY CREST EL.109.0 2 `d 0 1 EL.107.0 MATCHEEKS BED N ^ EL.98.5 BASIN BOTTOM EL 105 i ^�>. ,..,.. EL.104.0 ,^ EL 98.5 CD V/ �• - INV.EL.102.0 I 72'4 X 30'LG CONCRETE PIPE I ASTM-C-76 CL II I EL 97.5 ^= Z17 8"o PERFORATED DRAIN ut D — D 1'7 PIPE IN GRAVEL FILLED E - E TRENCH MIN.PIPE SLOPE Tom• RIPRAP Q! 17f SEE DETAIL t SECTION CUTTING ✓ (�j FILTER FABRIC TO BE USED AS A PLANE 0 V] I.+. MARKER DURING POND CLEAN OUT AS 1••y 3'—TYP .) WELL AS A FILTER EL.107.0 . .Z 1�� y BA BOTTOM EL 105.0 p0 BACKFILL AROUND 8*0 PIPE USING 104.0 1 1/2 INCH NOMINAL DIAMETER WASHED (� GRAVEL.. PERFORATIONS SHOULD BE ON LOWER PART OF PIPE SCALE 0 4 8 12 FEET ti C. � SEDIMENTATION POND SUBDRAIN � DETAIL 1 _ CD O NOT To SCALE F — F t' 12 EXCEPT AS NOTED 2 1'Y 1"S Q LA :3 F.\ Ll-u.01/19/44 41 ILC,.1 )u ww x„ .i+•i�� .,w a ii / G 120 BYPASS PIPE •1 I'I » III ° I G Ir ------- --------------- I i ---"_-o. -----_- I _.--- - - - tAr"IiCR%.IE PIPE _-_...L i o F FUTURE FlSHWAY I I CHANNEL ITy PLAN H °o~ FlSHWAY OUTLET \o `-STAFF GAUGE TO (m DAM CREST BE INSTALLED 12Y BYPASS _ rl • - PIPE M 42'0 PIPE W DAM CREST EL 111.5 EL.111.5 a' DETAIL J .. ..... :. 6• 109.5 PlOO DOYRL FL100 MAX EL.108 NORMAL POOL(ORDINARY j INV.EL. 107.0 HIGH WATER LINE)E. 1085 '--1 Fl JOB __- _ 2 EL.107.5 42-P X�LG CONCRETE PIPE f -- SEE DETAR 3 I ( 6"FILLET(TYP.) (�E I \ BASIN OTTOM 1 .0 ASIN BOTTOM EL 105. MATCH BOTTOM OF L f03. - -- - 1 O O FUTURE FlSHWAY CHANNEL --- CCD 110 _ . 11 I SECTION CUTTING PLANE 1�p I G _ G (p a 1-0 0 1-0 �. TYP- Q. 1YP. H — H o Coln CD 8'COVER MIN. ROADWAY ✓ L- ) BACKFILL AROUND 12'4 ADS N-12 PIPE I 1� 3' y' USING 1/4-INCH CRUSHED ROCK. o (� = Q MIN. MIN A MINIMUM OF 36-INCHES OF COVER u Q WITH LOCALLY DERIVED FILL,REWIRED I 3/B�STAINLESS ►+• 1'-6' o STEEL PLATES Q 6'-0• ..f ca OVER PIPE WITHIN ROADWAY ALIGNMENT. W/BEVELS �• WHERE COVER IS LESS THAN 36-INCHES, A�• I, o BACKFILL WITH LEAN MIX-SO I PLAN 1 CEMENT 350 LB FLYASH PER YARD cBYPASS PIPE INLET (WITHIN ROADWAY ALIGNMENT ONLY). r�-r �• FINISHED GRADE TYPICAL FlSHWAY TYPICAL TOP OF 12'4 BYPASS PIPE PRO DE TEE HANDLE BYPASS PIPE 6•BED MIN. WEIR ELEVATION FlSHWAY WEIR MIN.SLOPE 1R FOR GATE OPERATION SCALE: I'-3'-0'EL,116.5 y TYPICAL DETAIL 2 EXISTING GRADE "T.s. DETAIL 3 GI 12'FLAT BACK I LIGHT DUTY SLUICE GATE — 13. �1 \ SCALE 0 4 B 12 FEET O 1-D. I ' r-, �_ Q q• 1' 12' Q • F� 1'-0' EXCEPT AS NOTED ^' Corps of Engineers Permit Application PROPOSED FISH LADDER ��„� f BEGIN PROJECT AT OUTFALL OF RECONSTRUCTED SEDIMENT POND r 24• , t IJ I 78. .., t REPUff E10S1NC pj ..• • 6RpO(AS REM) wSE 416- g J'.... ' to J "t r; 40 RRACE CR 9MND ♦, ,r v r Ek1S19 BOX g1LVfRIS 16 100 Y��;;[VIE ...,... , SELECTED -SECTIONS NOT TO SCALE A "~ 150 0 150 Scale in Feet END PROJECT Figure 7 Proposed Improvements to Existing Creek Channel Plan and Sections Lower Maplewood Creek Flooding and Habitat Improvement Projects / I o CONCRETE DAM ' (REMOVED 10/96) --------------- --- — — -- -- f firms 11 1 rr J r i s•r`�t'. O PROPOSED FISH LADDER . ' S EXISTING SEDIMENTATION POND EXISTING PARKING LOT Q # � �tp (REMOVED 9/96) OLD CLUBHOUSE s / 1 1 t i.•r (NO LONGER IN USE NEW SEDIMENT POND (CONSTRUCTED 8/97) � _ ----- -- STUMP 1 _ FIR WIDEN EXISTING CREEK �RROX., 2)REGRADE SIDESLOPES ADSTABLIZEi oo MAPLEWOOD WATER TRANSMISSION LINES REVEGETATE WITH NATIVE PLANTINGS. FIR /\ fret1 PRIVATE HOMES 36°DEC/ 0 0 _ o LEGEND: Es . Fl LOW FLOW DIVERSION STRUCTURE \ OVERFLOW TO EXISTING CREEK CHANNEL r r °F -' '4 EXISTING MAPLEWOOD PROPOSED LOW-FLOWf CREEK ALIGNMENT \ ���. X o _\ FISH CHANNEL � � �. �� - 0 \ - PROPOSED LOW-FLOW o i20 DEC / � FISH CHANNEL MAPLEWOOD BOOSTER DEC CD, 10..FIRRPUMPON I � � i � '�> DEC. FI •� \ � .r EXISTING GOLF COURSE GREENS 6"�SRRUB d�P\- 6"PINE %o® PINE \ A)1 6"FIR B"FIR `\ `\\\\ / �// \ C • v/ 6 FIR 6 R� 6"FlR ,,$$ 6 IR y / 1 *\\I EXISTING TREES 6°FIR 6"llR Fl 5 MAPLEWOOD CREEK �` FIB., FIR/ -� \ �o�� fi�R �o,E EXISTING CHANNEL FIR 6"FIR \-/ \\ / 6"FIR 6.�R FIR , \\ / .. • / 6"FlR FlR � *fi"FIR a fi"FIR DEC\` / \\ • \ Cy 61 *6"FIR . PROPOSED CULVERT OR BRIDGE (TYPICAL) v q O \ o • � O *6°FIR \ n ' ` FlR EXISTING CONTOURS 0c9 ,c� x/ '�' 2.0 FT INTERVALS (cil, 1` TjNG )T \ )(ISTING WSDOT FISH LADDER �,�� 1� PROPERTY LOT LINES _______ , CITY LIMITS M_ \ N Q a o ood Creek Flooding Maplewood g LL S ` o/' \ •, And Habitat Improvement ------ DRAFT 0 U) / \ __� Z oo Q,/ o ,,-�_ ' ti --� � / ' ,o � CITY OF RENTON o � � ' 1 I \ =_ � \, \ � `� , � � � DEPARTMENT OF PUBLIC WORKS too o goo - in Feet SITE PLAN - REVISED U DESIGNED: DWC DATE: 2/16/98 FILE NAME: DRAWN: MDD 1 Revised Channel Location MDD DWC 2 16 98 CHECKED: SCALE: 111-1001 FIELD BOOK: PAGE: NO. REVISION BY APPR. DATE APPROVED: SHEET: 1 OF: 1 DIRECTOR OF' PUBLIC WORKS Y EXISTING CONCRETE DAM I 1 (TO BE REMOVED) I ' I rf PROPOSED L T TION AREA oPas SLOPE s s ---PROPOSED SEDIMENT PON J , A is r EXISTING SEDIMENTA TON POND 111 p ( OBE REMOVED) \ / :i _...� PROPOSED FISH LADDER .r 6 ti _ i .. J EXISTING PARKING LOT - , .rt 1 , / ' --_... MAPLEWOOD WATER TRANSMISSION LINES ...._ - r - - ;r' -, EXISTING CLUBHOUSE (NO LONGER IN USE) al _.!{; ,•,;, �_: .r,,,,,,, -. —..._.. .' 1 � j f i' l / • PRIVATE HOMES ---- - / ! 1 J A 1 r LEGEND: r \ 1 M 1 t • . � �\, . r _.• � ____ PR OSED LOFFLOW J .t � `~-� `-�• 0 - EXISTTING MAPL EWOOD P 'ti,l t _. ; -.... MAPLEo.•OD BOOSTER I - t r IJ CREEK ALIGNMENT - FISH PASSAGE CHANNEL ' , PUMP S AIION n O '—� - � ••'^ .-C:,u.'if .E -'` / ^, �' .._.. ..... ff ' PROPOSED LOW—FLOW \ FISH PASSAGE CHANNEL e r - _- / O EXISTING GOLF COURSE GREENS r o � ; ,V ,� � `. ;;�'' ,�" f� ENS 1 1 f \ ! Y r sHaae ',"'c I'FIR � rmrrw Y - r , S�„ EXISTING TREES t0" J �f1fl.CIRM1 �( 8• FlR) a'+FR r \ , r gnn r rw +� ar - PROPOSED BRIDGE (TYPICAL) fie'FIR 1 ) \ 6.R0 � f t a.� O< t EXISTING COUNTOURS ( .O FT INTERVALS) E SUNG WSD T FISH LADDER — , a t1' _ �• `� \ J - PROPERTY LOT LINES ?€ c a' — — — — CITY LIMITS ' �� HIGHsFLOW CAPACITY / / \ \ -�" � � / s IMPROVEMENTS (CONCEPTUAL) Maplewood Creek Flooding And Habitat Improvement Cn \� SDRAFT 0 U) _q-- 0 CITY OF RENTON DEPARTMENT OF PUBLIC WORKS 100 O too w SITE PLAN Scale in Feet DESIGNED: DWC DATE: 1 4 96 FILE NAME: DRAWN: MDD CHECKED: SCALE: 1"=100, FIELD BOOK: PAGE. 2766 NO. REVISION BY APPR. DATE APPROVED: SHEET: 1 OF: , DIIiECTDR OF PLIDLIC VORKS - 0 0 0 4 040 00 040% 00, ❑ 0 {❑ �2D # 0 EX15T. GRADE `�-� 20 MIN. j& 0 16❑❑ } � ❑ ❑ PROPOSED 5LOPE 2/. MIN. � SEDIMENT POND � SLOPE 2/. MIN. ❑ ❑ ❑ ❑ ❑ �❑❑ �❑❑ �❑❑ �❑ TO EX15T. GRADE TO EXIST. GRADE 0❑ ❑ 4' - 01_1� ❑ '0 00 ❑ 1.0 "' ❑ 3 6 TOP50 L LOG DKOf 5TKUCTURE �❑ &❑❑ HYDK05EED� �❑ 3'-6" COBBLE 12"-24" 13OULPEK 1"-2" GRAVEL EXISTING CLUBHOUSE IMPEKVI05 CLAY LINEK ,actors (NO LONGER IN USE) 5ECTION A F8 T6 NTS , , y�, t i — 26 MIN. F6 , 6' 3' 10' 3' 6' EX15T GRADE Gb SLOPE 21% MIN. H H SLOPE 2'/o MIN. TO EX15T. GRADE TO EX15T. GRADE G3 1' 3' c . . . $6CtfOC1 F5 1.0' F3 3"-6" TOP501L & HYDR05EED n / 12"-24" BOULDEPZ IMPEKVIOU5 CLAY LINEK 3'-6" COBBLE W LWD INSTALLED 1"-2" OKAVEL IN CHANNEL Fd " 5ECTDN NTS F2 12 MI . SLOPE 2'/o MIN. 5L00E 2'/o MIN. TO EX15T. GKADE <-i I TO EX15T. GRADE ion B F1 'Y x cflon _ 3"-6" TOPSOIL & HYDR05EED 4 1/2 4 PIPE 5ECTION C Maplewood Creek NTS Low— Flow Fish Passage Channel 0C) wabo6m red cedar ❑ tall-groW g nat8va npprox scale: Planting and Channel Design \&ve 8rm o�up, Oregw grape,salal DRAFT s 000 o$ blaIck twhebe"group turf❑� tort gressse6 cart Pam CITY OF RENTON After ate Cart Path DEPARTMENT OF PUBLIC WORKS LANDSCAPE PLAN DESIGNED: `,DWC DATE: 1 4 96 FILE NAME: DD SCALE: AS SHOWN FIELD 900K: PAGE: NO. REVISION BY APPR. DATE APPROVED: NOR SHEET: OF: , O IRECTOR OF PIIDLIC KS BYPASS PIPE INLET p / / SEE DWG. 2 CENTER NOTCH SECTION OF UPPER - 120' LG SEDIMENTATION ZONE 12' MIN. DAM CREST /�� CONCRETE DAM TO BE REMOVED AT REMOVE ACCUMULATED SEDIMENT ELEVATION 01111- EL. 111.5 LEAST TO EL. 122.5 OR ONE FOOT PRIOR TO DAM REMOVAL BELOW DOWNSTREAM GRADE OF CREEK SCOUR ZONE BOTTOM - 130 o DOWNSTREAM 25 2 UPSTREAM ACCESS ROAD AND 12"0 -- / / / F _ /-z -- - - - / ADS N-12 BYPASS PIPE SIDE 1 /� > > L\ M SIDE (MIN. PIPE SLOPE 1%) / - \ !/ 120 \Z- - -- -- - - - - - - - - - - - - -- -- - / /__7 / A ALL FILL COMPACTED TO 98% EXISTING ACCESS ROAD TO / / / LONGITUDINAL PROFILE AT MAPLEWOOD MAXIMUM DRY DENSITY AND COMPACTED BE IMPROVED SEE NOTE 1 / // / o CREEK ACROSS UPPER CONCRETE DAM FROM OPTIMUM MOISTURE VARIES FILL OFFSITE / / �"� 110 CONTENT TO PLUS 0L - MATERIALS SCALE: 1" = 20 H = LOCALLY DERIVED / TYPICAL DAM SECTION FILL o SCALE: 1" = 10' (HORIZ. AND VERT.) 4" OCK / / / A 4 MAN ROCK 24"-3U" DIA. / B 2 MAN ROCK 12"-18" DIA. �• LENGTH OF REPAIR STREAM /J I SECTION - 70 FEET CHANNEL 6 _ o LENGTH OF REPAIR SECTION - 60 FEET // • TOE OF SLIDE WILL REQUIRE N 60 4 / �, / �� • TOE OF SLOUGH WILL REQUIRE 40 / MAN ROCK, 30 CL 8-0 X 75 LG ADS HEAVY 00 v " `O `>> / / 40" MAPLE BEDDING GRAVEL 4 MAN ROCK; 15 CUBIC YARDS OF / CUBIC YARDS OF DUTY PERFORATED DRAIN / / , o B — B 2 MAN ROCK; 10 CUBIC YARDS OF / 2 MAN ROCK, 20 PIPE SEE DETAIL 2 DWG. 3 CRUSHED ROCK (2-INCH). / CUBIC YARDS OF EXISTING 9"0 WOOD SCALE: 1" = 10' CHANNEL // CRUSHED ROCK 1 4" HEMLOCK (2) / / / PIPE TO BE REMOVED • MINOR RESHAPING OF UPPER WIDTH i • (2-INCH). ro �j // ,�� l / SLOPE AND DISPOSAL OF VEGETATION AND SURFACE RESHAPED SLOPE SLOPE TO BE REVEGETATED �r1p / / EXISTING 8"0 SOIL. _ cv WILL REQUIRE WITH A MIX OF EROSION 6 1 / METAL PIPE TO ` - - EXCAVATION AND / - BE REMOVED DISPOSAL OF 25 CONTROL GRASSES AND / �09 C - C CUBIC YARDS OF NA11VE SHRUBS (TYP.) 14" HEMLO / VEGETATION AND END OF EXISTING ACCESS SCALE: 1" = 10' / EXISTING 4 0 PVC PIPE ROAD TO BE IMPROVED, SURFACE SOILS. TO BE REMOVED SEE NOTE 1 A - 4 MAN ROCK 24"-30" DIA. �K B - 2 MAN ROCK 12"-18" DIA. EL. 108 SILT TO BE REMOVED BEFORE P` ©- RESHAPE SLOPE REMOVING CONCRETE DAM REMOVE ACCUMULATED 1 �,�� J // �• // i N -- 30" COTTONWOOD SECTION � SEDIMENTS FISHWAY OUTLET '�� / / CENTER NOTCH SECTION OF -4NOTE �3 SEE DWG. 3 �K / o EXISTING CONCRETE DAM TO -� 36 ' 20" HEMLOC ��� / / EL. 105 / BE REMOVED. NOTCH SECTION o QUANTITIES STATED ARE � 12 0 ADS N-12 // MIN. 10 BOTTOM WIDTH AT FOR ENGINEERING ESTIMATE 1 '�� / �' 1 BOTTO EL. 10 / REMOVE EXISTING i BYPASS PIPE 0 MAPLE '� IRRIGATION INLET 45 CUT BOTH SIDES I ONLY AND NOT TO BE USED NORMA / AND PIPE UPSTREAM FOR BIDDING PURPOSES. / ,� \ EL. 10 5 - OF NEW INLET // CONTRACTORS MUST 18" MAPLE / / PREPARE INDEPENDENT �? BOULDERS OF 2' TO 3' QUANTITY ESTIMATES. SIZE TO BE PLACED ON / Go CREEK BOTTOM AT 8' 4" CEDAR DAM CREST EL. 111.5 8 TO 10' SPACING (TYP.) SEE TYPICAL DAM SECTION > '06 / _N FROM UPSTREAM END OF 30" E / / / THE SEDIMENTATION BASIN / � HEMLOCK EDGE OF EXISTING L / TO 100' UPSTREAM OF THE FUTURE FISHWAY 30' PAVEMENT / �? 1 o UPPER DAM / 4D CHANNEL � � `` SPILLWAY CREST M j S�+OPE � N � / '� 50" MAPLE EL. 109.0 �06 ^ EL. 111.5 / / EDGE OF EXISTING ,/ / ��ti �o ACCESS ROAD (TYP.) oIng, 7� �� / ,�p 42 CEDAR O g / / 2 rii G // // / 706 // EXISTING CONCRETE // 12" MAPLE `1�� IZr 4 j WEIR TO BE REMOVED / // o w��,_ f•,, / 2,, / 7 / �;�� / -EXISTING RIPRAP / / / a° -10 TO BE REMOVEDry O R 00 h O ^ �—EXISTING NEW INLET TO/ // ' • ' y REMOVE EXISTING PAVEMENT � � Q� / �� / / 0" LE �E. �� 4' CED SEWER MH, PIPE AND TRENCH / ^�r � / � '� IRRIGATION/ / �, / / o PIPE / 1. ACCESS ROAD SURFACE TO BE 4" DEEP 70 MATERIAL. FROM BASIN AND / 7/8" CRUSHED ROCK ROLLED ON A NDER DAM. CUT AND CAP PIPE / / co �-y CROWNED EARTH SURFACE FOR A \ f 02 \ /l /l SF O ���1! / MINIMUM ROAD WIDTH 12'. EDGE OF EXISTING PA T (TYP. o� // D 0" AR 2. Ag� EXCAVATE TO RESHAPE THE SLOPE. 3 \\ SLOPE TO BE OVER EXCAVATED, / HEMLOCK REPLACE WITH ROCKERY AND Z 5�� RIPRAP WITH GRAVEL DRAIN. c & GUY ANQHO / / CID / J cc �NSDPILLWAY T / CITY OF RENTON OUTy/ SEE DWG. 2 / 0 10 20 40 aA DEP:ARTMENT OF PUBLIC WORKS a/ APPROXIMATE LOCA11ON �'q/ / — - - NORTH WEST, INC. / OF EXISTING IRRIGATION �y MAPLEWOOD CREEK SEDIMENTATION BASIN PIPE SCALE IN FEET Engineers and Scentists RECONSTRUCTION AND IMPROVEMENT PROJECT F 1 = 20 Bellevue, Wash'ington SITE PLAN AND SECTIONS o E 4" MAPLE\12" MAPLE DESIGNED: A.L. HNW DATE: 11-22-94 FILE NAME: ---- — g DRAWN: C.L.C. HNW EDGE C-- EXISTING BUILDING (TYP) 4J/ --- -- - - - - - ---------- -- SCALE: AS NOTED FIELD BOOK: PAGE: / CHECKED: A.L. HNW / \ NO. REVISION BY APPR. DATE APPROVED: SHEET: 1 OF: 3 DIRECTOR OF PUBLIC WORKS m a N Y7 O Y -8" EMERGENCY o DRAIN GATE JOINT TO MATCH 72"0 PIPE END (TYP') F --- 0 M D D - - - - - - - - I � o LI � o SPILLWAY - _ I - 72"0 OUTLET PIPE _ _ - _ f i / 0 - - - - - - - - - - - - - - - - - f 0 I 1'-0" SLOT—� M 8" SUBDRAIN F ' GATE PLAN 26'-0" 5'-0" 12'-0" - - 8'-0" 8" FLAT BACK LIGHT DUTY SLUICE GATE PROVIDE TEE HANDLE FOR GATE OPERATION 14'-0" E DAM CREST EL 111.5 DAM CREST EL 111.5 EL 111.5 100 YR. FLOOD MAX. - - 0 POOL EL. 110.5 2.5 SECTION CUTTING -� PLANE SPILLWAY CREST_EL. 109.0 2 EL. 107.0 EL. 107.0 MATCH EXISTING- -0 INV. EL. 106.0 2 CREEK BED BASIN BOTTOM EL. 105.0 _ - - - - - - - - - - - - - - - -- - - - -- - - � 1 ---- f ., EL 98.5 ,::....::'.. EL. 104.0 EL. 104.0 INV. EL. 102.0 EL 97.5 +----- - 72"d X 30' LG CONCRETE PIPE ASTM-C-76 �, ::. EL 98.5 f EL. 97.5 0D I z •r ` I I N i•r. l • E 8"O PERFORATED DRAIN D - D PIPE IN GRAVEL FILLED TRENCH MIN. PIPE SLOPE TYP 8'-0" 5'-0" RIPRAP - 18" DIA. _ C E — E 1% SEE DETAIL 1 RIP RAP FILTER FABRIC TO BE USED AS A MARKER DURING POND CLEAN OUT AS WELL AS A FILTER. `t�,V.RT 110 30" (MIN ) C�'J� %&AS4. Cr -0 BASIN BOTTOM EL. 105.0 Z of z - --- 19768 BACKFILL AROUND 8"0 PIPE USING _. 1 1 2 INCH NOMINAL DIAMETER WASHED/ S�o.�„L tip.GRAVEL. PERFORATIONS SHOULD BE ON �• LOWER PART OF PIPE. --- U 0 T EnPlii' °° f z to — 0 CITY OF RENTON DEPARTMENT OF PUBLIC WORKS 2'-0" MIN. 0- 2 4 --- -- NORTHWEST, INC. MAPLEWOOD CREEK SEDIMENTATION BASIN SCALE IN FEET Engineers and Scientists RECONSTRUCTION AND IMPROVEMENT PROJECT SEDIMENTATION POND SUBDRAIN 1• = 4' Bellevue, Washington SPILLWAY AND OUTLET PLAN, SECTIONS & DETAIL DETAIL 1 DESIGNED: A.L. HNW DATE: 11-22-94 FILE NAME: n S N.T.S. - - - _ DRAWN: C.L.C. HNW SCALE: AS NOTED FIELD BOOK: PAGE: CHECKED: A.L. HNW i N0. REVISION BY APPR. DATE APPROVED: DR TO F USIC SHEET: 2 OF: 3 WORK a rn O w 120 BYPASS PIPE o / H o of I I G I I G I I — — — — — — — — — — — - - - - - - - - - - - -- - - - - - - -- - - - � ,--FUTURE FISHWAY CHANNEL PLAN H o FISHWAY OUTLET STAFF GAUGE TO DAM CREST BE INSTALLED 12"0 BYPASS 6'-0" PIPE - ---- - ---- - 8'-0" 1'-O" 8'-0" 3'-6" 6" 4200 PIPE— DAM CREST EL. 111.5 EL 111.5 6 100 YR. FLOOD MAX SEE DETAIL 3 \ PO OL�L. 110.5 EL. 108.7 ` ' EL 109.5 = EL_ ,... INV. EL 107.0 NORMAL POOL EL. 108.5 EL 106.7 2 EL 107.5 \�1 6" FILLET (TYP.) - - - 42"0- 32' LG CONCRETE PIPE - I EL 104.5 SEE DETAIL 3 I I - - I BASIN BOTTOM EL 105.0 BASIN BOTTOM EL. 105.0 I `\ MATCH BOTTOM OF EL 103.7 � T�T �- - - L' 1 '5 FUTURE FISHWAY CHANNEL - - - - - •: O O io SECTION CUTTING PLANE 1'—O" 1'-0" TYP. TYP. H — H J to J 6" COVER MIN. - - - I ROADWAY _ - - - I � o O z_ 3. BACKFILL AROUND 12"0 ADS N-12 PIPE i� 3" USING 1/4-INCH CRUSHED ROCK. 3" 2" IN MIN. A MINIMUM OF 36-INCHES OF COVER o 3/8 STAINLESS STEEL 6 1 - • WITH LOCALLY DERIVED FILL, REQUIRED PLATES W/BEVELS 5'-0" P v a o ► — OVER PIPE WITHIN ROADWAY ALIGNMENT. 101. f..! o � WHERE COVER IS LESS THAN 36-INCHES, o• �2� a BACKFILL WITH LEAN MIX-50 LB � PLAN e � CEMENT 350 LB FLYASH PER YARD 3 -6» 3 -6w �o �44 o (WITHIN ROADWAY AUGNMENT ONLY). 7Z- BYPASS PIPE INLET o d o4 6 D a v 0 1 0» 4 Vv,RT LI FINISHED GRADE P of WASy� �Cr / TYPICAL FISHWAY TYPICAL TOP OF WEIR ELEVATION FISHWAY WEIR 12"0 BYPASS PIPE -PROVIDE TEE HANDLE BYPASS PIPE 6" BED MIN. SCALE: 1" = 1'-0" (� 19768 �+ MIN. SLOPE 1X FOR GATE OPERATION TYPICAL DETAIL 2 G, _k�19768 DE7;AIL 3 ASS � �w z ►� EL 116.5 N.T.S. NAL c EXISTING GRADE exah�s ��_j 12" FLAT BACK INV. EL. 11.5.5 � LIGHT DUTY - - SLUICE GATE :;; W 113.0 CA ;.. CITY OF RENTON 0 2 4 8 ' ^ p ''� DEP.ARTMENT OF PUBLIC WORKS IN - -- 6 NORTHWEST, INC MAPLEWOOD CREEK SEDIMENTATION BASIN B 3" 3'-0" 1'-ON SCALE IN FEET Engineers and Scientists RECONSTRUCTION AND IMPROVEMENT PR OJECT "/V 1 = 4# Bellevue, Washington FISHWAY OUTLET PLANS, SECTIONS & DETAILS i o N DESIGNED: A.L. HNW g 1,—O" _ __ DATE: 11-22-94 FILE NAME: DRAWN: C.L.C. HNW J — J ---- CHECKED: A.L. HNW SCALE: AS NOTED FIELD BOOK: PAGE: NO. REVISION BY APPR. DATE APPROVED: SHEET: 3 OF: 3 DIRECTOR OF PUBLIC WORKS