HomeMy WebLinkAboutSWP272264(18) 1 H PA
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Supplemental l m"bri- nation for th.e HPA Application
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' Af plewaod Creek Flooding and
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I,reijaxcd for
1 City of Renton, Wa siiin�,Y ors
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1 Prepared by
Harza
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Supplemental Information for the HPA Application
Maplewood Creek Flooding and
Habitat Improvement Projects
' May 1996
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Prepared for
' City of Renton,Washington
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' Prepared by
Harza
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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........................It
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
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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
t 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
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The information in Table 2 was compiled from data provided by King County Surface Water
1 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
1 commonly used in the State of Washington and other regions for design of fish passage and
habitat facilities.
1 As is typical for this type of stream in Western Washington, the annual low flow periods
1 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
1 4.21 cfs. Likewise, in low runoff years, low flows of 0.53 to 0.74 cfs can be expected.
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Maplewood Creek H:\\96-352A.doc
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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
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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
' during 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
tflow 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.
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Maplewood Creek H:\\96-352A.doc
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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
t 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
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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.
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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
tfish 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
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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
iembankment.
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.
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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.
1 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.doc
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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\96-3 5 2 a:D W C:p s
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FIGURE 1: Project Construction Schedule
Maplewood Creek Sedimentation Basin
and Fish Channel Project
September October November December
ID Task Name Duration Start Finish tV25 9/1 9/8 9/15 gm 9/29 110/6 11W13 10/20 10/27 11/3 11/10 11/17Ill/2-4 12/1 12/8
1 Sedimentation Basin Improvements 47d i 8/26/98 10/29/96
2 Construction access roads I 2d I BY26/96 8/27/96 •::
__
3 Upper weir sgemoval t r and demo lid l 8J2�8J98 i 9%6�9g
4 Creek slope stabilization 4d I 9/9/961 9/12/96
6 Upper weir diversion i 12d 6/28/98' 1/1 Mil
6 Bypass pipeAntake installation 2d 9/13/96l 9/16/98
7 Sedimentation basin diversion 25d 9/17/96 i 10/21/96
8 Sedimentation basin silt removal 10d 9/17/96I 9/3Qr96
9 Embankment construction I Od 1 10/1196I1I 10/14/96
10 Spillway construction 5d� 10/1/961 iW7/98
11 Fshway outlet/piping construction i Sd 11OY114/96 10170/96
72 Uner placement ! 3d 10/21/98
13 Basin piping installation —T 2d' 10/24196; 10/25/96
74 Reclamation j 2d I 10/28/96 j 1 W29/96
16 Fish Channel Construction(Optional) 44d!� M6196 10/24/96
17 Fish Channel Construction 44d� 1W14/96, 12/12/96 �
16 Fish ladder construction —f 20d1 10/74/96611/8l96
.
_ :_.�
19 Cleadng/grubbingttransplanting 1 3d! 10/14/96: 1W16/96
......................................
i::•i:•?iii
20 Channel excavation 30d' 1Wi6/W 11/26/96
21 Crossing construction(8 req'd) 27d 10/21/96 y._____. ..:..::.....:::•....::.:.;._:::;;'!(:::; ; 3;::::••::+':::;::5•;1;:•?� .
11/26/96 E_' 0 Elm ❑
30 Utiliy crossing No.1 2d 10121/96 10/22/96 El
31 Utility crossing No.2 2d! 1111/96 11/4/96
32 Clay/gravN placement 30d: 10121196: 11/29/96
.. ..... .. ..:. ..::. .;ii
33 Flsh habitat structure installation 25d 1 W23/96 11/26!96
34 Vegetation planting 7d i 17R7/96' 12/5196
36 Reclamation Sd 12/6I98 12/12/96
Project: Task Milestone Rolled Up Task :'..':'.':'.':'.:'.':'.'`.'f .,`;'•;•':•';;'y�i'; `;•'`•;':';'•;'.:•`,':• Rolled Up Progress
Date:SG1/96 Progress 9 EMOMMON� Summary S Rolled Up Milestone O
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' 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:
Ic
7�1 A P4-7 ��—) I / &Z27C
Gregg ' me , A mini trator DATE
' Depart t of Planning/Building/Public Works
.,- Z-Z-7-- l'
Sam Chastain, Administrator DATE
Community Service Department
Le eel r, ire Chief DATE
R16nton Fire Department
' DNSSIG.DOC
CITY OF RENTON
SHORELINE MANAGEMENT AL . .,,.
' 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
S
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.
Plan ng/ ildin P lic Works Administrator � r Date
' SHSUBDEV.DOC
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