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TIR-3961
Prepared for: SSHI LLC dba D.R. Horton 12910 Totem Lake Blvd NE, Suite 220 Kirkland, WA 98034 Prepared by: CPH Consultants Matt Hough, PE Bryce Bessette, PE 11431 Willows RD NE, Suite 120 Redmond, WA 98052 October 9, 2017 Final Technical Information Report MeadowVue CPH Project No. 0035-15-012 Renton, WA CP H CO N SU LTA NT S DEVELOPMENT ENGINEERING IFitz-James 12/27/2017 SURFACE WATER UTILITY rstraka 01/02/2018 11431 WILLOWS ROAD NE, SUITE 120 REDMOND, WA 98052 P: (425) 285-2390 | F: (425) 285-2389 www.cphconsultants.com Site Planning Civil Engineering Project Management Land Use Consulting MEADOWVUE RENTON, WASHINGTON FINAL TECHNICAL INFORMATION REPORT October 9, 2017 Prepared For: D.R. Horton, Inc. 12910 Totem Lake Blvd. NE, #220 Kirkland, WA 98034 Prepared By: CPH Consultants Matthew J. Hough, PE Bryce Bessette, PE CPH Project No. 0035-15-012 Site Planning Civil Engineering Project Management Land Use Consulting FINAL TECHNICAL INFORMATION REPORT MEADOWVUE CITY OF RENTON, WA TABLE OF CONTENTS SECTION 1 – PROJECT OVERVIEW 3 FIGURE 1 – VICINITY MAP FIGURE 2 – TIR WORKSHEET SECTION 2 – CONDITIONS AND REQUIREMENTS SUMMARY 9 SECTION 3 – OFFSITE ANALYSIS 11 SECTION 4 – FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN 13 SECTION 5 – CONVEYANCE SYSTEM ANALYSIS AND DESIGN 19 SECTION 6 – SPECIAL REPORTS AND STUDIES 20 SECTION 7 – OTHER PERMIT 21 SECTION 8 – CSWPPP ANALYSIS AND DESIGN 22 SECTION 9 – BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT 24 SECTION 10 – OPERATIONS AND MAINTENANCE MANUAL 25 FIGURES FIGURE 3 – EXISTING SITE CONDITIONS FIGURE 4 – DEVELOPED SITE CONDITIONS FIGURE 5 – DRAINAGE BASINS FIGURE 6 – DRAINAGE SUB-BASINS FIGURE 7 – UPSTREAM BASIN APPENDICES APPENDIX A – NRCS SOILS DATA AND PROJECT GEOTECHNICAL REPORT (TERRA ASSOCIATES, INC.; FEBRUARY 2, 2017) APPENDIX B – WWHM REPORT APPENDIX C – CONVEYANCE BACKWATER ANALYSIS APPENDIX D – OFFSITE ANALYSIS APPENDIX E – OTHER REPORTS APPENDIX F – INDIVIDUAL ON-LOT BMP ANALYSIS APPENDIX G – BOND QUANTITY WORKSHEET MeadowVue Technical Information Report CPH Project No. 0035-15-012 October 9, 2017 CP|H CONSULTANTS Page 3 SECTION 1 – PROJECT OVERVIEW This preliminary Technical Information Report (TIR) is provided to describe the stormwater conditions and proposed drainage improvements for the MeadowVue project. The project proposes to subdivide one existing property into fourteen individual single-family residential parcels, public access road, and a storm tract within the City of Renton. This report is provided to identify the applicable storm drainage standards and to summarize the analyses and design provisions proposed for the project to comply with city surface water standards. The information provided within this TIR represents the basis of design for the storm drainage systems and surface water conditions for the project. The project is located in the southeast portion of the City of Renton. The vicinity map provided below as Figure 1 illustrates the general location of the property. The street address of the project site is 13833 156th Ave SE (King County tax parcel no. 1463400060). The City of Renton city limits run along the southern and western edges of the site, with unincorporated King County area located south, southwest, and west of the project site. More generally, the site is located in the NE ¼ of the SW ¼ of Section 14 of Township 23 North, Range 5 East, in King County, Washington (see Vicinity Map below). Figure 1– Location/Vicinity Map MeadowVue Technical Information Report CPH Project No. 0035-15-012 October 9, 2017 CP|H CONSULTANTS Page 4 The project site is comprised of one parcel with an area of approximately 4.54 acres. One single-family home, an asphalt driveway, and various outbuildings exist on the site, as well as several trees of varying type, age, and health condition. Figure 3 displays the existing site conditions. The proposed subdivision will create a total of fourteen (14) single-family residential lots. In addition, the project will include half street frontage improvements along 154th Ave SE and add concrete curb, gutter, and sidewalk along 156th Ave SE. The 154th Ave SE ROW is currently undeveloped as public right-of-way, but includes privately maintained gravel driveways with the existing right-of-way. Total site impervious coverage for individual lots is limited to 50% by the zoning designation, however the project is proposing a maximum of 40% impervious lot coverage. The proposed site plan is shown in Figure 4. The developed site is required to provide Basic Water Quality treatment in addition to Flood Problem Flow Control (FPFC) per current City of Renton surface water standards. Water quality storm volumes are proposed to be treated with a combined detention/water quality pond in the southwest corner of the site. A series of on-site catch basin inlets and underground pipes will collect and convey surface water runoff westerly within proposed road right-of-way for the majority of the developed site to the combined detention/water quality pond for flow control. Release rates will be controlled by a three orifice control riser, and discharged to an existing ditch located southwest of the site, on the east side of 154th Ave SE right-of- way. A very limited portion of the widened pavement section along 154th Ave SE and 156th Ave SE will be bypassed due to the existing topography and grade of the roads. However, to offset this detained and untreated area, the site will be treating runoff from a portion of previously untreated pavement along 156th Ave SE. This trade is further discussed in Section 4. Storm drainage controls for this project are proposed in accordance with the 2017 City of Renton Surface Water Design Manual (RSWDM), which is based on the 2016 King County Surface Water Design Manual (KCSWDM) with some modifications to reflect City of Renton specific requirements. On-site Soil Conditions The soils of the area are characterized generally by the Natural Resource Conservation Services (NCRS) as Alderwood gravelly sandy loam (AgC). A site-specific investigation of the existing site geotechnical conditions was performed by Terra Associates, Inc. A copy of the NRCS soils data and the full geotechnical report by Terra is provided in Appendix A of this report for reference. MeadowVue Technical Information Report CPH Project No. 0035-15-012 October 9, 2017 CP|H CONSULTANTS Page 5 Figure 2 – Technical Information Report (TIR) Worksheet, 2017 Surface Water Design Manual Part 1 PROJECT OWNER AND PROJECT ENGINEER Part 2 PROJECT LOCATION AND DESCRIPTION Project Owner: SSHI, LLC dba D.R. Horton Project Name: MeadowVue Phone: (425) 825-3186 DDES Permit #: ______________________ Address: 12910 Totem Lake BLVD NE Suite 220 Kirkland, WA 98034 Location: Township: 23 N Range: 5 E Project Engineer: Bryce Bessette, PE Section: 14 Phone: (425) 285-2390 Site Address: 13833 156th Ave SE Renton, WA 98059 Part 3 TYPE OF PERMIT APPLICATION Part 4 OTHER REVIEWS AND PERMITS ■ Landuse Services DFW HPA Shoreline Subdivision / Short Subd. / UPD COE 404 Management Building Services DOE Dam Safety Structural M/F / Commercial / SFR FEMA Floodplain Rockery/Vault/ ____ Clearing and Grading COE Wetlands ESA Section 7 Right-of-Way Use Other: General Construction Stormwater Permit Other: Part 5 PLAN AND REPORT INFORMATION Technical Information Report Site Improvement Plan (Engr. Plans) Type of Drainage Full / Targeted / Type (circle one): Full / Modified / Review (circle): Large Site Small Site Date (include revision Date (include revision dates): 6/6/2017; rev. 8/18/2017 dates): 2/6/2017; rev. 8/18/2017 Date of Final: Date of Final: Part 6 ADJUSTMENT APPROVALS Type (circle one): Standard / Complex / Preapplication / Experimental / Blanket Description: (include conditions in TIR Section 2) Date of Approval: _____________________________ MeadowVue Technical Information Report CPH Project No. 0035-15-012 October 9, 2017 CP|H CONSULTANTS Page 6 Figure 2 – Technical Information Report (TIR) Worksheet, 2017 Surface Water Design Manual (cont’d.) Part 7 MONITORING REQUIREMENTS Monitoring Required: Yes / No Describe: Start Date: Completion Date: Part 8 SITE COMMUNITY AND DRAINAGE BASIN Community Plan: East Plateau Special District Overlays: None Drainage Basin: Lower Cedar River Stormwater Requirements: Basic Water Quality, Flood Problem Flow Control Part 9 ONSITE AND ADJACENT SENSITIVE AREAS River/Stream Steep Slope Lake Erosion Hazard Wetlands Landslide Hazard Closed Depression Coal Mine Hazard Floodplain Seismic Hazard Other Habitat Protection Part 10 SOILS Soil Type Slopes Erosion Potential AgC 8% - 15% Yes High Groundwater Table (within 5 feet) Sole Source Aquifer Other __________________ Seeps/Springs Additional Sheets Attached Figure 2 – Technical Information Report (TIR) Worksheet, 2017 Surface Water Design Manual (cont’d.) Part 11 DRAINAGE DESIGN LIMITATIONS MeadowVue Technical Information Report CPH Project No. 0035-15-012 October 9, 2017 CP|H CONSULTANTS Page 7 REFERENCE LIMITATION / SITE CONSTRAINT Core 2 – Offsite Analysis Sensitive/Critical Areas SEPA Other Additional Sheets Attached Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet per Threshold Discharge Area) Threshold Discharge Area: (name or description) Existing ditch located southwest of project site Core Requirements (all 8 apply) Discharge at Natural Location Number of Natural Discharge Locations: 1 Offsite Analysis Level: 1 / 2 / 3 Dated: 12/29/16 Flow Control Level: 1 / 2 / 3 or Exemption Number: (include a facility summary sheet) Small Site BMP’s: _Full Dispersion_____________________ Conveyance System Spill containment located at: Erosion and Sediment Control ESC Site Supervisor: TBD Contact Phone: After Hours Phone: Maintenance and Operation Responsibility: Private / Public If Private, Maintenance Log Required: Yes / No Financial Guarantees and Liability Provided: Yes / No Water Quality Type: Basic / Sens. Lake / Enhanced Basic / Bog (include facility summary sheet) or Exemption No. _______________________ Landscape Management Plan: Yes / No Special Requirements (as applicable) Area Specific Drainage Type: CDA / SDO / MDP / BP / LMP / Shared Fac / None Requirements Name: ________________________________ Floodplain/Floodway Delineation Type: Major / Minor / Exemption / None 100-year Base Flood Elevation (or range): _______________ Datum: Flood Protection Facilities Description: Source Control Describe landuse: Residential (comm./industrial landuse) Describe any structural controls: Oil Control High-use Site: Yes / No Treatment BMP: __________________________________ Maintenance Agreement: Yes / No with whom?: Other Drainage Structures Describe: Figure 2 – Technical Information Report (TIR) Worksheet, 2017 Surface Water Design Manual (cont’d.) Part 13 EROSION AND SEDIMNET CONTROL REQUIREMENTS MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS MeadowVue Technical Information Report CPH Project No. 0035-15-012 October 9, 2017 CP|H CONSULTANTS Page 9 SECTION 2 – CONDITIONS AND REQUIREMENTS SUMMARY Compliance with Project Drainage Requirements The storm drainage and temporary erosion control standards for the project are established by the 2017 City of Renton Surface Water Design Manual (RSWDM). The project requires Directed Drainage Review as it exceeds more than 2,000 square feet of new impervious surface coverage and disturbs more than 7,000 square feet of land. The RSWDM specifies nine core and six special requirements that are to be met for this project. Compliance and/or applicability of each of these design standards are summarized below: RSWDM Core Requirements 1. Discharge at Natural Location: The project site currently slopes and drains southwesterly to a ditch southwest of the project site, on the east side of 154th Ave SE. On-site storm water will maintain this existing drainage pattern and ultimate downstream discharge in accordance with current flow control standards. 2. Offsite Analysis: Summarized in Section 3 – Off-site Analysis. 3. Flow Control: The project requires Flood Problem Flow Control flow control according to the KCSWDM Flow Control Map. Flow control will be provided by a combined detention/water quality pond. 4. Conveyance System: The project proposes to collect on-site runoff and convey it to the proposed on- site combined detention/water quality pond at the southwest corner of the site. These improvements are shown in Figures 4 and 5 and are described further in Section 5 – Conveyance System Analysis and Design. 5. Construction Stormwater Pollution Prevention: Temporary controls are as described in Section 8 – CSWPPP Analysis and Design. 6. Maintenance and Operations: The on-site storm drainage facilities are proposed to be publicly maintained. Refer to Appendix A of the King County Surface Water Design Manual for the Maintenance Requirements. 7. Financial Guarantees and Liability: A City of Renton Bond Quantity Worksheet has been prepared for this project and submitted to the City under separate cover. Approval and all financial guarantees will be provided by the developer. 8. Water Quality: Basic Water Quality treatment is required for the proposed project. This treatment level is to be achieved by means of a combined detention/water quality pond as shown on Figures 4 and 5 and as described in Section 4 – Flow Control and Water Quality Facility Analysis and Design. 9. On-site BMPS: This project is a residential subdivision and proposes to provide individual on-lot BMPs in accordance with RSWDM section 1.2.9.3. A combination of BMP facilities from the menus provided in RSWDM section 1.2.9 will likely be relied upon, including credits for Restricted Footprint (RSWDM C.2.9.2) for individual on-lot facilities. The feasibility of additional BMPs will be analyzed at the time of the building permit review is discussed further in Section 4 of this TIR. The project geotechnical report confirms that the native soils at the site are not suitable to support infiltration, bioretention, or permeable pavement as BMPs for the extent of the public roadway improvements. The roadway configuration through the middle of the site with new intersection connections to 156th Avenue and MeadowVue Technical Information Report CPH Project No. 0035-15-012 October 9, 2017 CP|H CONSULTANTS Page 10 154th Avenue do not provide the required downstream flow path for basic dispersion. As such, the only BMP proposed within the public right-of-way is amended soils as required by RSWDM 1.2.9.3.2 within planter and adjacent landscape areas along the new plat roadway. The hydrologic modelling of the proposed combined detention and water quality pond took no credit for BMP implementation within the right-of-way. RSWDM Special Requirements 1. Other Adopted Area-Specific Requirements: No area-specific requirements apply to this project site. 2. Flood Hazard Area Delineation: The limits of this project are not located within or in proximity to a 100-year floodplain. 3. Flood Protection Facilities: Not applicable. 4. Source Control: No additional source control is proposed. 5. Oil Control: The project is not considered a high-use area and no special oil control provisions are required. 6. Aquifer Protection Area: The limits of this project are not located within an Aquifer Protection Area (AFA). MeadowVue Technical Information Report CPH Project No. 0035-15-012 October 9, 2017 CP|H CONSULTANTS Page 11 SECTION 3 – OFF-SITE ANALYSIS Task 1: Study Area Definition and Maps The proposed project site is located at 13833 156th Ave SE in Renton, WA. The site is currently developed with one single-family home, an asphalt driveway, and various outbuildings. The existing ground cover consists mostly of grass with various trees of varying age and health. The existing site topography consists of slopes ranging from 0% to 15%. The existing site conditions are shown in Figure 3. Task 2: Resource Review King County iMAP and the City of Renton (COR) Maps and GIS Data were reviewed to identify any potential sensitive areas in the proximity of the project site. • Wetlands: iMap does not identify any wetlands on the project site. • Streams and 100-year Floodplain: The project site is not located in the 100-year floodplain. • Erosion Hazard Areas: COR Maps identifies no erosion hazard areas on the project site. • Seismic Hazard Areas: COR Maps identifies no seismic hazard areas on the project site. • Coal Mine Hazard Areas: COR Maps identifies no coal mine hazard areas on the project site. • Critical Aquifer Recharge Area: The project site is not located within a critical aquifer recharge area per iMAP records • Basin Condition: iMap does not indicate any basin conditions. • Areas Susceptible to Groundwater Contamination: iMap does not show the project site as being susceptible to groundwater contamination. King County iMAP was also reviewed for downstream drainage complaints. A total of eight possible relevant complaints were identified, all in Unincorporated King County. However, after correspondence with the County only two of the eight were considered relevant to our downstream. The complaints (Complaint no. 2011-1008 and 2016-0515) are attached in Appendix E. Complaint no. 2011-1008 was a report of illegal dumping of two television sets which was taken care of by KC Roads, and is thus not considered a downstream drainage issue. Complaint no. 2016-0515 was an inquiry about the geomembrane liner of water quality/detention pond DT0240. After investigation the reviewer concluded, “All components of the facility appeared to be in good condition and working order,” and thus is not considered a downstream issue. Task 3: Field Inspection A field inspection was performed on December 29, 2016 on a cloudy day with a temperature of approximately 45 degrees. The existing topography of the site has slopes ranging from 0% to 15%. The project site is comprised of a single drainage basin with surface runoff traveling primarily as sheet flow over pervious areas. The drainage basin is comprised mostly of grass along with one single-family home, various outbuildings, landscaped areas, and an asphalt driveway. Based on visual inspection during the site visit and survey contour data there are no low points where runoff can collect on site. Task 4: Drainage System Description Downstream Basin Runoff from the project site sheet flows southwesterly before entering an off-site ditch on the east side of 154th Ave SE. The grass lined ditch has shallow side slopes and slopes to the south. Visual indications and information obtained from nearby homeowners indicate ponding along 154th Ave SE approximately 60 feet north of the intersection of 154th Ave SE and SE 142nd St. Flooding is likely due the flat topography in this area. There is an existing 12” culvert that passes under 154th Ave SE with minimal slope. Runoff entering the ditch near the southwest property corner flows south along 154th Ave SE for approximately 600 feet, MeadowVue Technical Information Report CPH Project No. 0035-15-012 October 9, 2017 CP|H CONSULTANTS Page 12 including passing underneath 6 driveways through culverts, before crossing west underneath the road through a 12” culvert. Runoff then flows around the northwest corner of the intersection of 154th Ave SE and SE 142nd Street before continuing to flow west along the north side of SE 142nd Street for approximately 250 feet. At this point runoff flows south underneath the road through a culvert which enters a catch basin in a ditch on the south side of the road. The downstream path could not be followed further due to buried pipes and private property restrictions. However, from the topography of the area it is believed that the runoff continues southwest through pipes and open channel flow for about 550 feet before discharging to a creek. The creek flows south for approximately 3000 feet following the general path of 154th Pl SE and then converges with the Cedar River near the intersection of 154th Pl SE and SE Jones Rd. The river continues northwest before ultimately discharging into Lake Washington. A downstream map and photos are attached in Appendix E. Upstream Basin The project site is bordered by single-family residences to the north and south, 156th Ave SE to the east, and 154th Ave SE to the west. Runoff from 154th Ave SE and the residences to the south flow away from the site. Runoff from the west side of 156th Ave SE flows into a shallow ditch between the road and the property. Runoff from the residences to the north flows southwest, causing portions of the properties to sheet flow on the project site before entering the ditch on the east side of 154th Ave SE. MeadowVue Technical Information Report CPH Project No. 0035-15-012 October 9, 2017 CP|H CONSULTANTS Page 13 SECTION 4 – FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN The hydrologic analysis of the runoff conditions for this project is based on drainage characteristics such as basin area, soil type, and land use (i.e., pervious vs. impervious) in accordance with the King County Surface Water Design Manual and City of Renton addendum. The Western Washington Hydraulic Model (WWHM) software was used to evaluate the storm water runoff conditions for the project site and to design the on-site flow control facilities. The following is a summary of the results of the analysis and the proposed drainage facility improvements for this project. Existing Site Hydrology The existing site conditions are shown in Figure 3 and summarized in Table 4.1 below. Table 4.1 – Land Use Cover, Existing Site Conditions (prior to development) Basin ID Total Area (AC) Land Cover (AC) Impervious Till Forest Pasture Site Basin (including additional intake) 4.96 0.09 0.00 4.87 The Western Washington Hydraulic Model (WWHM) software was used to model the existing site hydrology and calculate runoff peak rates. The results of the existing site runoff analysis are provided in Appendix B. Existing site conditions were modeled as historic site (i.e., fully forested) conditions in the analysis of the pre-developed conditions for all on-site targeted developed surfaces in accordance with RSWDM standards for Flow Control. The pre-developed land use conditions used in the WWHM model are summarized in Table 4.2a. Table 4.2a – Land Use Cover, Pre-Developed Site Conditions (for WWHM) Basin ID Total Area (AC) Land Cover (AC) Impervious Till Forest Till Grass Site Basin (to WQ Pond) 4.87 0 4.87 0 Basin 2 0.085 0 0.085 0 Total 4.96 0 4.96 0 The site drainage basin area totals 4.87 acres and includes two sub-basins totaling 0.14 acre (delineated as Bypass Basins in Figure 5) that will be bypassed due to the grades of the site. However, an additional 0.09 acre, delineated as Additional Intake Basin in Figure 5 that is located off-site will be passed through the on-site facility detained, and treated for water quality. This additional intake area currently sheet flows onto the subject property and is not conveyed to a detention or water quality facility. Any areas of road widening or frontage improvements were modeled as forest for existing conditions. An approximately 9.5-acre off-site, upstream area drains southwesterly toward SE 154th Avenue SE with runoff travelling as sheet and shallow concentrated flows. This area—which is comprised of a mixture of forest, pasture, single-family residences, maintained landscape, and gravel and asphalt pavement/driveways—is collected by a series of shallow ditches and culverts along the easterly half of the right-of-way. These conveyance features currently flow southerly along the west frontage of the project site. Project improvements include a series of new culverts, catch basin inlets, and below-grade storm drainage pipe to bypass runoff volumes from this off-site upstream area around the proposed detention and water quality pond. The existing land use conditions used in the WWHM model for this upstream bypass area are summarized in Table 4.2b. MeadowVue Technical Information Report CPH Project No. 0035-15-012 October 9, 2017 CP|H CONSULTANTS Page 14 Table 4.2b – Land Use Cover, Upstream Offsite Conditions Basin ID Total Area (AC) Land Cover (AC) Impervious Pasture Till Grass Offsite Basin 1 9.50 4.56 0.95 3.99 Input and output parameters for this model are provided in Appendix B of this report. Developed Site Hydrology The site is planned to be improved with roadway, storm drainage, and utility infrastructure in support of fourteen (14) new single-family residences. Frontage improvements on 154th Avenue SE and 156th Avenue SE will be completed in accordance with city road standards as conditions with the preliminary plat approval. The developed site conditions contributing to the proposed flow control and water quality facility were modelled as a single basin using the WWHM software program. The majority of the roads, building roof drains, on-site paved surfaces and most landscape areas on the site are collected and directed to the on-site combined detention/water quality pond. Topographic constraints at the southeasterly and southwesterly frontages, however, require that a small portion of runoff area from 154th Avenue SE and 156th Avenue SE will bypass the facility. The onsite detention pond facility was designed/sized to over-detain flows to mitigate for the westerly bypass basin (i.e., 154th Avenue SE), and the point of convergence for this west bypass area and the pond release occurs just outside the southwest corner of the site at an existing ditch—with within the quarter-mile downstream threshold. The bypass area within 156th Avenue SE does not converge with the flows from the site and the 154th Avenue SE corridor. However, mitigation of both flow volumes and rates, and increased pavement surfaces is provided by capturing runoff from existing paved roadway surfaces in the northern portion of the 154th Avenue SE frontage that currently are untreated and conveying them to the onsite facility. The bypass area in 156th Avenue SE does not share the same point of compliance as the project site. However, the WWHM model confirms that the increase in the peak runoff rate for the improved easterly bypass area is only 0.04 cfs, which is less than the 0.1 cfs exemption allowed by the RSWDM. The existing developed non-target surface area that are being collected from the northern portion of the 156th Avenue SE right-of-way that are being collected for mitigation trade has similar characteristics as the target surface areas being bypassed as it is similar in area and ground cover. As such, the limited uncontrolled runoff from the bypassed target surfaces is not expected to create any adverse impact to downstream drainage systems, salmonid habitat, or properties as it is collected in existing roadside ditches. Fully developed conditions were modeled assuming 40% impervious coverage for the lots. The impervious and pervious areas for all other areas were accounted for by measuring the new roads and sidewalks as impervious, and grass areas as pervious. These values for the developed land use conditions as they were used in the WWHM analysis are summarized in Table 4.3. Table 4.3 – Land Use Cover, Developed Conditions Basin ID Total Area (AC) Land Cover (AC) Impervious Till Forest Till Grass Site Basin (to WQ Pond) 4.87 2.10 0 2.77 Bypass Basin West 0.16 0.118 0 0.043 Bypass Basin East 0.085 0.032 0 0.053 Total 5.12 2.25 0 2.87 MeadowVue Technical Information Report CPH Project No. 0035-15-012 October 9, 2017 CP|H CONSULTANTS Page 15 Appendix B contains the WWHM model summaries, input and output results, for both the flow control and water quality pond analysis as well as for the off-site upstream peak runoff for bypass design. On-Site BMPs Core requirement #9 requires that all proposed projects provide on-site BMPs to supplement formal flow control and water quality facilities proposed to mitigate the hydrologic impacts generated by new impervious and pervious surface, existing impervious surfaces, and replaced impervious surface. The on-site BMPs are methods to disperse, infiltrate, or otherwise reduce or prevent development related increases in runoff at or near the sources of those increases. On-site BMPs will be incorporated to the maximum extent feasible in accordance with RSWDM sections 1.2.9.2.1, Small Lot BMP Requirements and 1.2.9.3, Subdivision and Road Improvement Projects BMP Requirements. Individual On-lot BMPs for Subdivision This project is a residential subdivision and proposes to provide individual on-lot BMPs in accordance with RSWDM sections 1.2.9.2 and 1.2.9.3. Individual on-lot BMPs must be implemented to mitigate an impervious area equal to at least 10% of the lot for lot sizes up to 11,000 square feet and at least 20% of the lot for lot sizes between 11,000 and 22,000 square feet. A combination of BMP facilities from the menus provided in RSWDM section 1.2.9 will likely be relied upon, including credits for Restricted Footprint (RSWDM C.2.9.2) for individual on-lot facilities. The project geotechnical report confirms that the native soils at the site are not suitable to support infiltration, bioretention, or permeable pavement as BMPs for the individual lots with a measured infiltration rate of zero inches per hour. RSWDM 1.2.9.2.1requires that the feasibility and applicability of full dispersion must be evaluated for all target impervious surfaces. Full dispersion has been determined to be unfeasible due to limited undisturbed native vegetation and insufficient flow paths. Full infiltration was also determined to be unfeasible due to poor soil infiltration characteristics. Following the infeasibility of full dispersion and infiltration, RSWDM requires consideration of other limited infiltration facilities such as drywells, rain gardens, bioretention facilities, and permeable pavement. Again, the native soils on the site are not suitable for infiltration and RSWDM does not allow for the use of underdrains in rain garden, bioretention, or pervious pavement sections. As such, the feasibility of these limited infiltration facilities is unlikely. Additional analysis by the project geotechnical engineer is proposed at the time of building permit application to determine which, if any, of these limited infiltration facilities could be implemented in conjunction with other Reduced Impervious Credit BMPs. The Basic Dispersion BMP is the preferred alternative per RSWDM where infiltration facilities are not feasible on a site. Basic Dispersion BMPs rely on moderately sloping vegetative surfaces with a minimum protected flow path of 25 feet. These types of facilities are effective BMPs where downstream conditions are well vegetated natural areas that can accommodate the filtration, uptake, and continued dissipation of flows. In the case of this project, no such native areas exist downstream. While the dimensional conditions of the rear yards of the lots could facilitate the flow path length, the grades of the lots, maintained lawn condition, and fact that the area downstream of a dispersed flow path would be an adjacent residential lot make this form of BMP impractical and ineffective. Renton Municipal Code (RMC) 4-2-110A allows up to 50% impervious coverage on single-family residential lots in the R4 zone. The project proposes impervious lot coverage at much less than this allowable maximum. RSWDM section 1.2.9.1 provides several Reduced Impervious Surface Credit BMPs. These include the Restricted Footprint, which recognizes the mitigating result for not building out to the maximum allowable impervious coverage. The Reduced Impervious Surface Credit BMPs are lower priority measures according to RSWDM, but these are also the most applicable, measurable, and maintainable measures that can be MeadowVue Technical Information Report CPH Project No. 0035-15-012 October 9, 2017 CP|H CONSULTANTS Page 16 provided with urban residential subdivisions. The square footage credit provided by the Restricted Footprint BMP toward the required 10% (or 20% for larger lots) target impervious mitigation area is the difference between the proposed lot impervious coverage and either 4,000 square feet or the maximum allowable impervious area allowed by the zoning code, whichever is smaller. All but one lot, lot 2, qualifies for the Restricted Footprint BMP credit to some degree. The amount of credit provided by this BMP, however, will not satisfy completely the RSWDM requirements for target impervious services. As such, additional measures will be required in conjunction with this credit. A matrix summarizing the Restricted Footprint credit and required additional treatment areas is provided in Appendix F of this report. The soil moisture holding capacity of new pervious surfaces shall be protected in accordance with the soil amendment BMP as detailed in Section C.2.13 of the CRSWDM and any proposed connection of roof downspouts to the local drainage system shall be via a perforated pipe connection as detailed in Section C.2.11 of the CRSWDM. Both of these BMPs will be implemented with the development of each of the individual lots during the home building (i.e., building permit) phase. Plat Infrastructure BMPs for Subdivision The project geotechnical report confirms that the native soils at the site are not suitable to support infiltration, bioretention, or permeable pavement as BMPs for the extent of the public roadway improvements with a measured infiltration rate of zero inches per hour. The roadway configuration through the middle of the site with new intersection connections to 156th Avenue and 154th Avenue do not provide the required downstream flow path for basic dispersion. As such, the only BMP proposed within the public right-of-way is amended soils as required by RSWDM 1.2.9.3.2 within planter and adjacent landscape areas along the new plat roadway. The hydrologic modelling of the proposed combined detention and water quality pond took no credit for BMP implementation within the right-of-way. Flow Control Flood Problem Flow Control (FPFC) is proposed for this project. The on-site combined detention/water quality pond has been designed to detain and release controlled flows through a typical flow control riser. A two orifice flow control riser is proposed for the outlet control structure to achieve conformance with the release to downstream systems. The sizes of the orifices on this riser have been designed to control peak runoff rate durations to no more than pre-developed site conditions for 50% of the 2-year event up through the 50-year event, and matching of the pre-developed 100-year peak runoff rate under developed conditions. Table 4.4 shows the pre-developed and post-developed peak flows for the 2-year, 50-year, and 100-year storm events and account for the bypass areas. Tables 4.4 and 4.5 summarizes the performance results and design criteria generated from the WWHM model for the proposed combined detention and wetpond facility under developed site conditions. Table 4.4 – Peak Flow Summary Facility Land-Use Condition Peak Flow Rates at Point of Compliance (cfs) 2-year 10-year 50-year 100-year Combined Detention and Water Quality Pond Pre-Developed 0.145 0.297 0.417 0.463 Developed 0.112 0.194 0.288 0.335 MeadowVue Technical Information Report CPH Project No. 0035-15-012 October 9, 2017 CP|H CONSULTANTS Page 17 Table 4.5 – WWHM Detention Pond Results Detention Pond Information Depth (including 12” freeboard) 8 ft Detention Volume (Live) 70,329 cf Riser Height 7.00 ft Riser Diam. 18 in Orifice 1 Diam., Elev: 0.00 ft 1.0625 in Orifice 2 Diam., Elev: 4.6 ft 2.3125 in Emergency overflow from the pond would have a controlled discharge to 154th Avenue SE via a rock- lined spillway. Any such releases would be collected and conveyed by the improved curb and gutter at the easterly edge of the 154th Avenue SE roadway where they would be released to an open ditch immediately downstream of the southeast corner of the site. The full WWHM results are provided in Appendix B. Water Quality Design The RSWDM requires that all proposed projects assess the requirement to provide water quality facilities to treat runoff from pollution-generating impervious and pervious surfaces. The standard for this project requires Basic Water Quality treatment of runoff from targeted surfaces prior to discharge to the downstream, off-site system. This treatment level is proposed to be achieved by a wetpool volume in the lower stages of the combined detention/wetpool pond facility located at the southwest corner of the site. The water quality pond was designed in general accordance with Section 6.4.1.2 of the RSWDM. The minimum required wetpool (i.e., treatment) volume of 0.124 acre-feet (5,410 cf) was generated by the WWHM model based on an in-line facility. The proposed pond grading provides a design wetpool volume of 0.198 acre-feet (8,636 cf). Table 4.6 summarizes the design conditions of the water quality portion of the pond facility. Table 4.6 – Water Quality Pond Design Water Quality Pond Information W/Q Volume Required 5,410 cf W/Q Volume Provided 8,636 cf Cell 1 Depth 5 ft Cell 2 Depth 5 ft WQ elevation 379.4 The pond has 3H:1V side slopes and is divided into two cells separated by a berm with 2:1 side slopes. The top of the berm is one foot below the water quality design water surface and the flow path from inlet to outlet has a 3:1 ratio as suggested by RSWDM. The first cell includes 1 foot of sediment storage and contains approximately 35% of the total water quality volume. The inlet to the pond is submerged with the invert 2 feet from the pond bottom. The outlet pipe has a reverse slope and extends 1 foot below the water quality water surface. A standard flow control riser in the northwestern corner of the pond controls release rates and this structure is proposed to be equipped with and leads to an outlet structure with a birdcage lid. The birdcage and open riser top serve as the primary overflow for the pond. Due to the existing topography and roadway grades, a small portion of runoff from 154th Ave SE and 156th Ave SE will be bypassed. However, to offset this untreated area, the site will be treating a runoff area MeadowVue Technical Information Report CPH Project No. 0035-15-012 October 9, 2017 CP|H CONSULTANTS Page 18 from an existing, currently untreated portion of roadway pavement along 156th Ave SE. Section 1.2.8.2.C in the RSWDM allows and describes the conditions for area trades for water quality treatment. This section of the manual also states that runoff from the target surface may be released untreated if an existing non-target surface of similar size and pollutant characteristics is treated on the site. The bypass areas, shown as the Bypass Basins in Figure 5 contain the treatment trade to mitigate PGIS that are not being treated by the water quality facility onsite. There is approximately 0.009 acres of untreated PGIS at 156th Avenue SE and 0.06 acres are bypassed at 154th Avenue SE for a total bypass of 0.069 acres. The currently untreated area at the northern portion of the 156th Ave SE frontage is 0.09 acres and is shown as the additional intake basin in Figure 5. Therefore, 0.03 acres of additional PGIS are being treated by the water quality facility. MeadowVue Technical Information Report CPH Project No. 0035-15-012 October 9, 2017 CP|H CONSULTANTS Page 19 SECTION 5 – CONVEYANCE SYSTEM ANALYSIS AND DESIGN Surface water collection and conveyance for the project is proposed by means of grading, grated inlets, and below grade pipes. The majority of the roads, building roof drains, on-site paved surfaces and most landscape areas on the site are collected and directed to the on-site combined detention/water quality pond. Stormwater from the pond will enter a flow control structure with a two orifice riser before discharging to the existing ditch on the east side of 154th Ave SE. Conveyance analysis for the project will be performed in accordance with Chapter 4 of the RSWDM which requires that new and existing pipe systems be designed with sufficient capacity to convey and contain at minimum the 25 year peak flow. The design flow rate for conveyance/backwater analysis is based on peak flow rates calculated using WWHM. Developed conditions for improved tributary areas and existing conditions for any off-site tributary areas were used for input parameters. The storm drainage conveyance systems are illustrated in Figure 4. A conveyance backwater analysis has been completed as summarized by the worksheets in Appendix C. MeadowVue Technical Information Report CPH Project No. 0035-15-012 October 9, 2017 CP|H CONSULTANTS Page 20 SECTION 6 – SPECIAL REPORTS AND STUDIES Geotechnical Report, by Terra Associates, Inc., February 2, 2017 Critical Areas Determination Report, by Acre Environmental Consulting, LLC, September 13, 2016 Arborist Report/Tree Plan, by S.A. Newman, January 16, 2017 MeadowVue Technical Information Report CPH Project No. 0035-15-012 October 9, 2017 CP|H CONSULTANTS Page 21 SECTION 7 – OTHER PERMITS Construction and Grading Permits will be obtained from the City of Renton for roadway, storm drainage, and sanitary sewer improvements proposed for the infrastructure serving the subdivision. Preliminary Plat Approval has been obtained from the City of Renton to establish the layout of the land division and to ensure the proposed plat is in accordance with COR adopted standards. The project will also require a NPDES General Construction Stormwater Permit (GCSWP) from the Washington State Department of Ecology to discharge storm water during construction. The NPDES permit has been applied for and is currently in the public comment period. The WAR permit number will be provided prior to construction. A narrative Construction Storm Water Pollution and Prevention Plan (CSWPPP) is provided in Section 8. A full CSWPPP including all necessary elements of the GCSWP will be prepared and available onsite prior to and during site construction activities. Individual building permits will be required for the on-site walls and the individual home structures. MeadowVue Technical Information Report CPH Project No. 0035-15-012 October 9, 2017 CP|H CONSULTANTS Page 22 SECTION 8 – CSWPPP ANALYSIS AND DESIGN Site specific details and provisions for the temporary erosion and sediment control (ESC) facilities are provided with the improvement plans that accompany this TIR. The proposed facilities have been selected and sized in accordance with the recommendations provided in the RSWDM standards. In addition to the site- specific ESC measures, the following general Best Management Practices (BMPs) for sediment control shall also be implemented in accordance with the provisions of the RSWDM: 1. Clearing Limits Construction clearing limits fence or silt fence will be installed by the contractor along the entire project corridor to prevent disturbance of project areas not designated for construction. These fences will be installed prior to clearing and grading activities where appropriate. 2. Cover Measures Temporary and permanent cover measures will be provided by the contractor to protect disturbed areas. Disturbed areas will be seeded and mulched to provide permanent cover measure and to reduce erosion within seven days, if those areas not scheduled for immediate work. 3. Perimeter Protection The contractor will install silt fences as indicated on the drawings prior to any up slope clearing, grading and trenching activities in order to reduce the transport of sediment offsite. 4. Traffic Area Stabilization Stabilized pads of quarry spalls will be installed by the contractor at all egress points from the project site as required to reduce the amount of sediment transported onto paved roads or other offsite areas by motor vehicles. 5. Sediment Retention Sediment retention will be provided by silt fencing, catch basin inlet protection, and sediment storage within the bottom the permanent stormwater pond during construction at the locations and dimensions shown on the project drawings. 6. Surface Water Control Surface water control will include ditches, temporary culverts, storm water pond, check dams, and/or other inlet and outlet protection at the locations and dimensions shown on the drawings. 7. Dust Control Water and/or street sweeping equipment will be used by the contractor to control dust emissions during construction operations. 8. Wet Season Requirements If soils are exposed during the period of October 1 to April 30, the contractor will mulch and seed or otherwise cover as much disturbed area as possible by the first week of October, in order to provide protective ground cover for the wet season. The contractor will also conform to the following wet season special provisions: A. Apply cover measures to disturbed areas that are to remain unworked for more than two days. B. Protect stockpiles that are to remain unworked for more than 12 hours. No area is to be left uncovered/denuded longer than 12 hours during the winter months. MeadowVue Technical Information Report CPH Project No. 0035-15-012 October 9, 2017 CP|H CONSULTANTS Page 23 C. Provide onsite stockpiles of cover materials sufficient to cover all disturbed areas. D. Seed all areas that are to be unworked during the wet season by the end of the first week of October. E. Apply mulch to all seeded areas for protection. F. Provide onsite storage of 50 linear feet of silt fence (and the necessary stakes) for every acre of disturbed area. Straw bales are to be stockpiled onsite for use in an emergency. G. Provide construction road and parking lot stabilization areas for all sites. H. Provide additional sediment retention as required by the City of Renton Engineer. I. Provide additional surface water controls as required by the City of Renton Engineer. J. Implement construction phasing and more conservative BMPs for construction activity near surface waters (to be evaluated). K. Review and maintain TESC measures on a weekly basis and within 24-hours after any runoff-producing event. 9. Sensitive Areas Restrictions No sensitive areas are located on-site. 10. Maintenance Requirements All ESC measures will be maintained and reviewed on a regular basis following the standard maintenance requirements identified in the project drawings. An ESC supervisor will be designated by the contractor and the name, address and phone number of the ESC supervisor will be given to the City prior to the start of construction. A sign will be posted at the primary entrance to the project site identifying the ESC supervisor and his/her phone number. The ESC supervisor will inspect the site at least once a month during the dry season, weekly during the wet season, and within 24 hours of each runoff-producing storm. A standard ESC maintenance report will be used as a written record of all maintenance. The contractor will be responsible for phasing of erosion and sediment controls during construction so that they are coordinated with construction activities. The contractor will also be responsible for maintenance of temporary controls during construction, including removal of accumulated sediment, and for the removal of the controls and remaining accumulated sediment at the completion of construction. 11. Final Stabilization Prior to obtaining final construction approval, the site shall be stabilized, the structural ESC measures removed and drainage facilities cleaned. To obtain final construction approval, the following conditions must be met: • All disturbed areas of the site should be vegetated or otherwise permanently stabilized in accordance with project BMPs. At a minimum, disturbed areas should be seeded and mulched to provide a high likelihood that sufficient cover will develop shortly after final approval. The plans include erosion control notes and specifications for hydro-seeding and mulching disturbed areas. • Structural measures such as silt fences, pipe slope drains, storm drain inlet protection and sediment traps and ponds shall be removed once the proposed improvements are complete and vegetated areas are stabilized. All permanent surface water facilities shall be cleaned completely and restored to working order prior to removal of ESC facilities. MeadowVue Technical Information Report CPH Project No. 0035-15-012 October 9, 2017 CP|H CONSULTANTS Page 24 SECTION 9 – BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT All required bonds, facility summaries, and covenants will be provided prior to final approval. A completed bond quantity worksheet is included in Appendix G of this report. MeadowVue Technical Information Report CPH Project No. 0035-15-012 October 9, 2017 CP|H CONSULTANTS Page 25 SECTION 10 – OPERATIONS AND MAINTENANCE MANUAL The on-site storm drainage conveyance facilities for this project will be publicly maintained by the City of Renton. The required BMP facilities will be privately maintained and designed in accordance with RSWDM. A site specific maintenance manual for the private BMPs will be completed prior to final recording. Site Planning Civil Engineering Project Management Land Use Consulting Site Planning Civil Engineering Project Management Land Development Consulting FIGURES LANE LANE 14 13 12 11 10 1 762543 9 8 CB35 CB40 CB41 CB45 CB46 CB60 CB30 CB31 CB25 156TH AVE SE154TH AVE SEROAD A CS100 STORM TRACT CB15 CB32 CB20 CB50 LEGEND 10 IN FEETPLAN 0 N 40 80 SEC. 14, TWP 23 N, R5E W.M. Copyright © 2017 CPH Consultants, LLC. All Rights Reserved. CP H O N S UL T A N T S 11431 Willows Rd. NE, Suite 120 Redmond, WA 98052 Phone: (425) 285-2390 | FAX: (425) 285-2389 www.cphconsultants.com Site Planning • Civil Engineering Land Use Consulting • Project Management CITY OF RENTON KING COUNTY, WASHINGTON MEADOWVUE FIGURE 4 - DEVELOPED SITE CONDITIONS LANE LANE WSTORM TRACT 76 14 13 12 11 10 1 2 543 ROAD A 154TH AVE SE156TH AVE SEBYBASS BASIN WEST = 0.16 AC ADDITIONAL INTAKE 9 8 SITE BASIN = 4.87 AC BYBASS BASIN EAST = 0.085 AC IN FEETPLAN 0 N 40 80 SEC. 14, TWP 23 N, R5E W.M. Copyright © 2017 CPH Consultants, LLC. All Rights Reserved. CP H O N S UL T A N T S 11431 Willows Rd. NE, Suite 120 Redmond, WA 98052 Phone: (425) 285-2390 | FAX: (425) 285-2389 www.cphconsultants.com Site Planning • Civil Engineering Land Use Consulting • Project Management CITY OF RENTON KING COUNTY, WASHINGTON MEADOWVUE FIGURE 5 - DRAINAGE BASINS PRE-DEVELOPED SITE CONDITIONS DEVELOPED SITE CONDITIONS DETENTION VAULT DATA LANE LANE WSTORM TRACT 76 14 13 12 11 10 1 2 543 ROAD A 154TH AVE SE156TH AVE SE9 8 CB60 CB45 CB46 CB50 CB41 CB40CB35 CB31 CB30CB25 CS100 CB20 CB32 CB15 IN FEETPLAN 0 N 40 80 SEC. 14, TWP 23 N, R5E W.M. Copyright © 2017 CPH Consultants, LLC. All Rights Reserved. CP H O N S UL T A N T S 11431 Willows Rd. NE, Suite 120 Redmond, WA 98052 Phone: (425) 285-2390 | FAX: (425) 285-2389 www.cphconsultants.com Site Planning • Civil Engineering Land Use Consulting • Project Management CITY OF RENTON KING COUNTY, WASHINGTON MEADOWVUE FIGURE 6 - DRAINAGE SUB-BASINS LANE 156TH AVE SE154TH AVE SEROAD A PROJECT SITE UPSTREAM BASIN PASTURE=0.95 AC GRASS=3.99 AC IMPERVIOUS=4.56 AC TOTAL=9.50 AC LEGEND 10 IN FEETPLAN 0 N 80 160 SEC. 14, TWP 23 N, R5E W.M. Copyright © 2017 CPH Consultants, LLC. All Rights Reserved. CP H O N S UL T A N T S 11431 Willows Rd. NE, Suite 120 Redmond, WA 98052 Phone: (425) 285-2390 | FAX: (425) 285-2389 www.cphconsultants.com Site Planning • Civil Engineering Land Use Consulting • Project Management CITY OF RENTON KING COUNTY, WASHINGTON MEADOWVUE FIGURE 7 - UPSTREAM BASIN Site Planning Civil Engineering Project Management Land Development Consulting APPENDIX A NRCS SOILS REPORT AND GEOTECHNICAL REPORT Soil Map—King County Area, Washington Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 12/23/2016 Page 1 of 352585805258600525862052586405258660525868052587005258580525860052586205258640525866052586805258700565180565200565220565240565260565280565300565320565340565360565380 565180 565200 565220 565240 565260 565280 565300 565320 565340 565360 565380 47° 28' 42'' N 122° 8' 6'' W47° 28' 42'' N122° 7' 55'' W47° 28' 38'' N 122° 8' 6'' W47° 28' 38'' N 122° 7' 55'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 10N WGS84 0 45 90 180 270 Feet 0 10 20 40 60 Meters Map Scale: 1:1,010 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: King County Area, Washington Survey Area Data: Version 12, Sep 8, 2016 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jul 8, 2014—Jul 15, 2014 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Soil Map—King County Area, Washington Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 12/23/2016 Page 2 of 3 Map Unit Legend King County Area, Washington (WA633) Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI AgC Alderwood gravelly sandy loam, 8 to 15 percent slopes 4.7 100.0% Totals for Area of Interest 4.7 100.0% Soil Map—King County Area, Washington Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 12/23/2016 Page 3 of 3 SITE Environmental Earth Sciences Terra Associates, Inc. Consultants in Geotechnical Engineering Geology and Figure 1Date FEB 2017 VICINITY MAP RENTON, WASHINGTON MEADOWVUE Proj. No.T-7315 0 1000 2000 APPROXIMATE SCALE IN FEET REFERENCE: http://www.wsdot.wa.gov/data/tools/geoportal/ ACCESSED 10/30/15 REFERENCE:REFERENCE ONLY AND SHOULD NOT BE USED FORDESIGN OR CONSTRUCTION PURPOSES.DIMENSIONS ARE APPROXIMATE. IT IS INTENDED FORNOTE:THIS SITE PLAN IS SCHEMATIC. ALL LOCATIONS ANDConsultants in Geotechnical EngineeringTerraAssociates, Inc.Geology andEnvironmental Earth SciencesProj. No.T-7315MEADOWVUERENTON, WASHINGTONEXPLORATION LOCATION PLANDate FEB 2017Figure 2LEGEND:050100APPROXIMATE SCALE IN FEETSITE PLAN PROVIDED BY CPH CONSULTANTS.APPROXIMATE TEST PIT LOCATIONTP-1TP-2TP-3TP-4TP-5TP-7TP-6IT-103IT-102IT-101IT-104APPROXIMATE INFILTRATION TEST LOCATION Environmental Earth Sciences Terra Associates, Inc. Consultants in Geotechnical Engineering Geology and MAJOR DIVISIONS LETTER SYMBOL TYPICAL DESCRIPTION GRAVELS More than 50% of coarse fraction is larger than No. 4 sieve Clean Gravels (less than 5% fines) GW Well-graded gravels, gravel-sand mixtures, little or no fines. GP Poorly-graded gravels, gravel-sand mixtures, little or no fines. Gravels with fines GM Silty gravels, gravel-sand-silt mixtures, non-plastic fines. GC Clayey gravels, gravel-sand-clay mixtures, plastic fines. SANDS More than 50% of coarse fraction is smaller than No. 4 sieve Clean Sands (less than 5% fines) SW Well-graded sands, sands with gravel, little or no fines. SP Poorly-graded sands, sands with gravel, little or no fines. Sands with fines SM Silty sands, sand-silt mixtures, non-plastic fines. SC Clayey sands, sand-clay mixtures, plastic fines. SILTS AND CLAYS Liquid Limit is less than 50% ML Inorganic silts, rock flour, clayey silts with slight plasticity. CL Inorganic clays of low to medium plasticity. (Lean clay) OL Organic silts and organic clays of low plasticity. SILTS AND CLAYS Liquid Limit is greater than 50% MH Inorganic silts, elastic. CH Inorganic clays of high plasticity. (Fat clay) OH Organic clays of high plasticity. HIGHLY ORGANIC SOILS PT Peat.COARSE GRAINED SOILSMore than 50% material largerthan No. 200 sieve sizeFINE GRAINED SOILSMore than 50% material smallerthan No. 200 sieve sizeDEFINITION OF TERMS AND SYMBOLS COHESIONLESSCOHESIVE Standard Penetration Density Resistance in Blows/Foot Very Loose 0-4 Loose 4-10 Medium Dense 10-30 Dense 30-50 Very Dense >50 Standard Penetration Consistancy Resistance in Blows/Foot Very Soft 0-2 Soft 2-4 Medium Stiff 4-8 Stiff 8-16 Very Stiff 16-32 Hard >32 2" OUTSIDE DIAMETER SPILT SPOON SAMPLER 2.4" INSIDE DIAMETER RING SAMPLER OR SHELBY TUBE SAMPLER WATER LEVEL (Date) Tr TORVANE READINGS, tsf Pp PENETROMETER READING, tsf DD DRY DENSITY, pounds per cubic foot LL LIQUID LIMIT, percent PI PLASTIC INDEX N STANDARD PENETRATION, blows per foot Proj. No.T-7315 MEADOWVUE RENTON, WASHINGTON UNIFIED SOIL CLASSIFICATION SYSTEM Date FEB 2017 Figures A-1 Site Planning Civil Engineering Project Management Land Development Consulting APPENDIX B WWHM REPORT WWHM2012 PROJECT REPORT Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:53:15 AM Page 2 General Model Information Project Name:Meadowvue - SDD_170925_bhb_mjh Site Name: Site Address: City: Report Date:9/26/2017 Gage:Seatac Data Start:1948/10/01 Data End:2009/09/30 Timestep:15 Minute Precip Scale:1.00 Version Date:2016/02/25 Version:4.2.12 POC Thresholds Low Flow Threshold for POC1:50 Percent of the 2 Year High Flow Threshold for POC1:50 Year Low Flow Threshold for POC2:50 Percent of the 2 Year High Flow Threshold for POC2:50 Year Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:53:15 AM Page 3 Landuse Basin Data Predeveloped Land Use Basin 1 Bypass:No GroundWater:No Pervious Land Use acre C, Forest, Mod 4.872 Pervious Total 4.872 Impervious Land Use acre Impervious Total 0 Basin Total 4.872 Element Flows To: Surface Interflow Groundwater Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:53:15 AM Page 4 Basin 2 Bypass:No GroundWater:No Pervious Land Use acre C, Forest, Mod 0.085 Pervious Total 0.085 Impervious Land Use acre Impervious Total 0 Basin Total 0.085 Element Flows To: Surface Interflow Groundwater Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:53:15 AM Page 5 Mitigated Land Use Developed Site (Basin 1) Bypass:No GroundWater:No Pervious Land Use acre C, Lawn, Mod 2.773 Pervious Total 2.773 Impervious Land Use acre ROADS MOD 2.099 Impervious Total 2.099 Basin Total 4.872 Element Flows To: Surface Interflow Groundwater SSD Table 1 SSD Table 1 Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:53:15 AM Page 6 Bypass West Bypass:Yes GroundWater:No Pervious Land Use acre C, Lawn, Mod 0.043 Pervious Total 0.043 Impervious Land Use acre ROADS MOD 0.118 Impervious Total 0.118 Basin Total 0.161 Element Flows To: Surface Interflow Groundwater Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:53:15 AM Page 7 Bypass East Bypass:No GroundWater:No Pervious Land Use acre C, Lawn, Mod 0.053 Pervious Total 0.053 Impervious Land Use acre ROADS MOD 0.032 Impervious Total 0.032 Basin Total 0.085 Element Flows To: Surface Interflow Groundwater Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:53:15 AM Page 8 Routing Elements Predeveloped Routing Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:53:15 AM Page 9 Mitigated Routing SSD Table 1 Depth:7.28 ft. Element Flows To: Outlet 1 Outlet 2 SSD Table Hydraulic Table Stage Area Volume Outlet (feet) (ac.) (ac-ft.) Struct NotUsed NotUsed NotUsed NotUsed 0.000 0.094 0.000 0.000 0.000 0.000 0.000 0.000 0.600 0.153 0.074 0.024 0.000 0.000 0.000 0.000 2.600 0.205 0.432 0.049 0.000 0.000 0.000 0.000 4.600 0.247 0.885 0.066 0.000 0.000 0.000 0.000 6.600 0.284 1.415 0.284 0.000 0.000 0.000 0.000 7.280 0.303 1.615 2.594 0.000 0.000 0.000 0.000 Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:53:15 AM Page 10 Analysis Results POC 1 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #1 Total Pervious Area:4.872 Total Impervious Area:0 Mitigated Landuse Totals for POC #1 Total Pervious Area:2.816 Total Impervious Area:2.217 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.145065 5 year 0.237701 10 year 0.297265 25 year 0.368118 50 year 0.417196 100 year 0.463037 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.112079 5 year 0.158175 10 year 0.193723 25 year 0.244782 50 year 0.287568 100 year 0.334671 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.167 0.112 1950 0.198 0.113 1951 0.317 0.260 1952 0.099 0.075 1953 0.080 0.090 1954 0.123 0.084 1955 0.197 0.092 1956 0.159 0.164 1957 0.128 0.100 1958 0.142 0.086 Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:53:51 AM Page 11 1959 0.122 0.087 1960 0.219 0.188 1961 0.120 0.118 1962 0.075 0.069 1963 0.103 0.090 1964 0.146 0.098 1965 0.097 0.138 1966 0.093 0.091 1967 0.223 0.114 1968 0.125 0.115 1969 0.122 0.092 1970 0.098 0.087 1971 0.111 0.103 1972 0.241 0.219 1973 0.107 0.128 1974 0.118 0.102 1975 0.165 0.103 1976 0.118 0.091 1977 0.017 0.085 1978 0.099 0.094 1979 0.060 0.101 1980 0.283 0.218 1981 0.089 0.093 1982 0.184 0.160 1983 0.157 0.093 1984 0.095 0.078 1985 0.056 0.083 1986 0.249 0.101 1987 0.219 0.148 1988 0.087 0.082 1989 0.057 0.081 1990 0.525 0.222 1991 0.279 0.178 1992 0.114 0.098 1993 0.111 0.068 1994 0.037 0.069 1995 0.159 0.103 1996 0.368 0.248 1997 0.284 0.270 1998 0.069 0.099 1999 0.311 0.197 2000 0.111 0.094 2001 0.020 0.096 2002 0.128 0.120 2003 0.191 0.110 2004 0.205 0.199 2005 0.152 0.089 2006 0.171 0.157 2007 0.397 0.296 2008 0.484 0.238 2009 0.226 0.119 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.5253 0.2960 2 0.4840 0.2701 3 0.3970 0.2598 Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:53:51 AM Page 12 4 0.3679 0.2485 5 0.3170 0.2383 6 0.3113 0.2216 7 0.2839 0.2194 8 0.2833 0.2177 9 0.2786 0.1994 10 0.2486 0.1972 11 0.2406 0.1879 12 0.2256 0.1776 13 0.2228 0.1643 14 0.2194 0.1597 15 0.2187 0.1570 16 0.2045 0.1476 17 0.1982 0.1380 18 0.1972 0.1278 19 0.1914 0.1203 20 0.1837 0.1191 21 0.1707 0.1181 22 0.1670 0.1146 23 0.1646 0.1141 24 0.1591 0.1135 25 0.1588 0.1116 26 0.1571 0.1103 27 0.1518 0.1031 28 0.1457 0.1026 29 0.1424 0.1025 30 0.1282 0.1019 31 0.1282 0.1010 32 0.1254 0.1007 33 0.1234 0.1001 34 0.1221 0.0990 35 0.1220 0.0981 36 0.1203 0.0978 37 0.1182 0.0957 38 0.1176 0.0937 39 0.1138 0.0936 40 0.1110 0.0926 41 0.1106 0.0926 42 0.1106 0.0920 43 0.1066 0.0918 44 0.1027 0.0912 45 0.0995 0.0909 46 0.0994 0.0901 47 0.0980 0.0896 48 0.0968 0.0889 49 0.0946 0.0869 50 0.0931 0.0866 51 0.0889 0.0862 52 0.0866 0.0855 53 0.0804 0.0841 54 0.0748 0.0835 55 0.0695 0.0820 56 0.0601 0.0805 57 0.0573 0.0782 58 0.0562 0.0750 59 0.0373 0.0692 60 0.0199 0.0687 61 0.0172 0.0685 Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:53:51 AM Page 13 Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:53:51 AM Page 14 Duration Flows The Facility PASSED Flow(cfs)Predev Mit Percentage Pass/Fail 0.0725 17357 13685 78 Pass 0.0760 15488 11841 76 Pass 0.0795 14247 10812 75 Pass 0.0830 13131 9944 75 Pass 0.0865 11725 8934 76 Pass 0.0899 10765 8243 76 Pass 0.0934 9676 7548 78 Pass 0.0969 8958 7073 78 Pass 0.1004 8113 6506 80 Pass 0.1039 7527 6128 81 Pass 0.1073 6793 5668 83 Pass 0.1108 6318 5313 84 Pass 0.1143 5773 4836 83 Pass 0.1178 5399 4468 82 Pass 0.1213 4947 4036 81 Pass 0.1248 4652 3775 81 Pass 0.1282 4259 3508 82 Pass 0.1317 4004 3343 83 Pass 0.1352 3653 3140 85 Pass 0.1387 3437 3003 87 Pass 0.1422 3142 2832 90 Pass 0.1456 2954 2676 90 Pass 0.1491 2714 2494 91 Pass 0.1526 2515 2357 93 Pass 0.1561 2321 2152 92 Pass 0.1596 2165 1998 92 Pass 0.1631 1973 1833 92 Pass 0.1665 1844 1711 92 Pass 0.1700 1702 1596 93 Pass 0.1735 1593 1520 95 Pass 0.1770 1483 1426 96 Pass 0.1805 1340 1314 98 Pass 0.1839 1256 1227 97 Pass 0.1874 1157 1104 95 Pass 0.1909 1098 1032 93 Pass 0.1944 1023 940 91 Pass 0.1979 970 861 88 Pass 0.2013 890 764 85 Pass 0.2048 842 694 82 Pass 0.2083 767 628 81 Pass 0.2118 733 564 76 Pass 0.2153 677 470 69 Pass 0.2188 636 419 65 Pass 0.2222 590 366 62 Pass 0.2257 563 330 58 Pass 0.2292 507 289 57 Pass 0.2327 475 259 54 Pass 0.2362 428 223 52 Pass 0.2396 390 200 51 Pass 0.2431 356 173 48 Pass 0.2466 331 155 46 Pass 0.2501 298 136 45 Pass 0.2536 274 125 45 Pass Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:53:51 AM Page 15 0.2570 241 113 46 Pass 0.2605 221 108 48 Pass 0.2640 197 104 52 Pass 0.2675 179 93 51 Pass 0.2710 157 84 53 Pass 0.2745 132 62 46 Pass 0.2779 122 55 45 Pass 0.2814 106 42 39 Pass 0.2849 97 32 32 Pass 0.2884 84 19 22 Pass 0.2919 78 4 5 Pass 0.2953 69 2 2 Pass 0.2988 62 0 0 Pass 0.3023 54 0 0 Pass 0.3058 47 0 0 Pass 0.3093 39 0 0 Pass 0.3128 32 0 0 Pass 0.3162 25 0 0 Pass 0.3197 22 0 0 Pass 0.3232 20 0 0 Pass 0.3267 18 0 0 Pass 0.3302 14 0 0 Pass 0.3336 13 0 0 Pass 0.3371 8 0 0 Pass 0.3406 7 0 0 Pass 0.3441 7 0 0 Pass 0.3476 7 0 0 Pass 0.3510 6 0 0 Pass 0.3545 6 0 0 Pass 0.3580 6 0 0 Pass 0.3615 6 0 0 Pass 0.3650 6 0 0 Pass 0.3685 5 0 0 Pass 0.3719 5 0 0 Pass 0.3754 5 0 0 Pass 0.3789 5 0 0 Pass 0.3824 5 0 0 Pass 0.3859 5 0 0 Pass 0.3893 5 0 0 Pass 0.3928 5 0 0 Pass 0.3963 4 0 0 Pass 0.3998 3 0 0 Pass 0.4033 3 0 0 Pass 0.4068 3 0 0 Pass 0.4102 3 0 0 Pass 0.4137 3 0 0 Pass 0.4172 3 0 0 Pass Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:53:51 AM Page 16 Water Quality Water Quality BMP Flow and Volume for POC #1 On-line facility volume:0.1242 acre-feet On-line facility target flow:0.0632 cfs. Adjusted for 15 min:0.0632 cfs. Off-line facility target flow:0.0436 cfs. Adjusted for 15 min:0.0436 cfs. Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:53:51 AM Page 17 LID Report Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:54:41 AM Page 18 POC 2 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #2 Total Pervious Area:0.085 Total Impervious Area:0 Mitigated Landuse Totals for POC #2 Total Pervious Area:0.053 Total Impervious Area:0.032 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #2 Return Period Flow(cfs) 2 year 0.002531 5 year 0.004147 10 year 0.005186 25 year 0.006422 50 year 0.007279 100 year 0.008078 Flow Frequency Return Periods for Mitigated. POC #2 Return Period Flow(cfs) 2 year 0.018624 5 year 0.025345 10 year 0.030181 25 year 0.036744 50 year 0.041969 100 year 0.04749 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #2 Year Predeveloped Mitigated 1949 0.003 0.028 1950 0.003 0.026 1951 0.006 0.016 1952 0.002 0.011 1953 0.001 0.012 1954 0.002 0.015 1955 0.003 0.017 1956 0.003 0.016 1957 0.002 0.019 1958 0.002 0.014 1959 0.002 0.013 Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:55:19 AM Page 19 1960 0.004 0.018 1961 0.002 0.016 1962 0.001 0.012 1963 0.002 0.017 1964 0.003 0.015 1965 0.002 0.020 1966 0.002 0.013 1967 0.004 0.026 1968 0.002 0.028 1969 0.002 0.018 1970 0.002 0.017 1971 0.002 0.021 1972 0.004 0.024 1973 0.002 0.010 1974 0.002 0.021 1975 0.003 0.020 1976 0.002 0.016 1977 0.000 0.015 1978 0.002 0.020 1979 0.001 0.022 1980 0.005 0.035 1981 0.002 0.017 1982 0.003 0.028 1983 0.003 0.020 1984 0.002 0.013 1985 0.001 0.017 1986 0.004 0.016 1987 0.004 0.020 1988 0.002 0.012 1989 0.001 0.019 1990 0.009 0.044 1991 0.005 0.034 1992 0.002 0.014 1993 0.002 0.014 1994 0.001 0.012 1995 0.003 0.015 1996 0.006 0.025 1997 0.005 0.019 1998 0.001 0.018 1999 0.005 0.042 2000 0.002 0.018 2001 0.000 0.018 2002 0.002 0.025 2003 0.003 0.025 2004 0.004 0.039 2005 0.003 0.015 2006 0.003 0.015 2007 0.007 0.041 2008 0.008 0.032 2009 0.004 0.022 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #2 Rank Predeveloped Mitigated 1 0.0092 0.0444 2 0.0084 0.0419 3 0.0069 0.0413 4 0.0064 0.0391 Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:55:19 AM Page 20 5 0.0055 0.0347 6 0.0054 0.0343 7 0.0050 0.0321 8 0.0049 0.0285 9 0.0049 0.0279 10 0.0043 0.0278 11 0.0042 0.0263 12 0.0039 0.0256 13 0.0039 0.0250 14 0.0038 0.0249 15 0.0038 0.0246 16 0.0036 0.0238 17 0.0035 0.0223 18 0.0034 0.0216 19 0.0033 0.0209 20 0.0032 0.0208 21 0.0030 0.0204 22 0.0029 0.0202 23 0.0029 0.0200 24 0.0028 0.0198 25 0.0028 0.0196 26 0.0027 0.0194 27 0.0026 0.0192 28 0.0025 0.0186 29 0.0025 0.0183 30 0.0022 0.0180 31 0.0022 0.0180 32 0.0022 0.0177 33 0.0022 0.0176 34 0.0021 0.0173 35 0.0021 0.0171 36 0.0021 0.0168 37 0.0021 0.0168 38 0.0021 0.0168 39 0.0020 0.0163 40 0.0019 0.0162 41 0.0019 0.0161 42 0.0019 0.0159 43 0.0019 0.0156 44 0.0018 0.0154 45 0.0017 0.0154 46 0.0017 0.0154 47 0.0017 0.0152 48 0.0017 0.0150 49 0.0017 0.0150 50 0.0016 0.0142 51 0.0016 0.0139 52 0.0015 0.0138 53 0.0014 0.0129 54 0.0013 0.0128 55 0.0012 0.0126 56 0.0010 0.0123 57 0.0010 0.0119 58 0.0010 0.0116 59 0.0007 0.0116 60 0.0003 0.0110 61 0.0003 0.0103 Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:55:19 AM Page 21 Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:55:19 AM Page 22 Duration Flows Flow(cfs)Predev Mit Percentage Pass/Fail 0.0013 17088 92293 540 Fail 0.0013 15488 87181 562 Fail 0.0014 14082 82689 587 Fail 0.0014 12808 78304 611 Fail 0.0015 11569 74241 641 Fail 0.0016 10515 70497 670 Fail 0.0016 9576 66947 699 Fail 0.0017 8757 63589 726 Fail 0.0018 8036 60466 752 Fail 0.0018 7347 57493 782 Fail 0.0019 6740 54713 811 Fail 0.0019 6192 52060 840 Fail 0.0020 5730 49601 865 Fail 0.0021 5309 47312 891 Fail 0.0021 4924 45152 916 Fail 0.0022 4569 43120 943 Fail 0.0022 4235 41195 972 Fail 0.0023 3951 39377 996 Fail 0.0024 3645 37730 1035 Fail 0.0024 3390 36062 1063 Fail 0.0025 3133 34500 1101 Fail 0.0025 2915 32960 1130 Fail 0.0026 2706 31591 1167 Fail 0.0027 2490 30244 1214 Fail 0.0027 2314 28960 1251 Fail 0.0028 2136 27848 1303 Fail 0.0028 1973 26715 1354 Fail 0.0029 1824 25645 1405 Fail 0.0030 1702 24619 1446 Fail 0.0030 1577 23592 1496 Fail 0.0031 1443 22651 1569 Fail 0.0031 1325 21731 1640 Fail 0.0032 1232 20852 1692 Fail 0.0033 1147 20022 1745 Fail 0.0033 1086 19169 1765 Fail 0.0034 1020 18384 1802 Fail 0.0035 946 17704 1871 Fail 0.0035 887 17028 1919 Fail 0.0036 824 16388 1988 Fail 0.0036 760 15772 2075 Fail 0.0037 724 15163 2094 Fail 0.0038 675 14609 2164 Fail 0.0038 623 14059 2256 Fail 0.0039 589 13560 2302 Fail 0.0039 549 13056 2378 Fail 0.0040 506 12602 2490 Fail 0.0041 469 12155 2591 Fail 0.0041 427 11738 2748 Fail 0.0042 388 11293 2910 Fail 0.0042 356 10872 3053 Fail 0.0043 328 10515 3205 Fail 0.0044 297 10132 3411 Fail 0.0044 269 9796 3641 Fail 0.0045 241 9490 3937 Fail Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:55:19 AM Page 23 0.0045 218 9172 4207 Fail 0.0046 197 8859 4496 Fail 0.0047 173 8581 4960 Fail 0.0047 152 8316 5471 Fail 0.0048 130 8051 6193 Fail 0.0048 119 7809 6562 Fail 0.0049 104 7557 7266 Fail 0.0050 95 7302 7686 Fail 0.0050 83 7082 8532 Fail 0.0051 74 6855 9263 Fail 0.0052 69 6639 9621 Fail 0.0052 61 6412 10511 Fail 0.0053 53 6190 11679 Fail 0.0053 46 6000 13043 Fail 0.0054 39 5837 14966 Fail 0.0055 29 5653 19493 Fail 0.0055 25 5493 21972 Fail 0.0056 22 5322 24190 Fail 0.0056 20 5159 25795 Fail 0.0057 17 5007 29452 Fail 0.0058 14 4857 34692 Fail 0.0058 12 4721 39341 Fail 0.0059 8 4579 57237 Fail 0.0059 7 4436 63371 Fail 0.0060 7 4303 61471 Fail 0.0061 7 4162 59457 Fail 0.0061 6 4023 67050 Fail 0.0062 6 3888 64800 Fail 0.0062 6 3771 62850 Fail 0.0063 6 3653 60883 Fail 0.0064 6 3529 58816 Fail 0.0064 5 3435 68700 Fail 0.0065 5 3341 66820 Fail 0.0066 5 3262 65240 Fail 0.0066 5 3172 63440 Fail 0.0067 5 3089 61780 Fail 0.0067 5 2999 59980 Fail 0.0068 5 2911 58220 Fail 0.0069 4 2832 70800 Fail 0.0069 4 2736 68400 Fail 0.0070 3 2659 88633 Fail 0.0070 3 2599 86633 Fail 0.0071 3 2526 84200 Fail 0.0072 3 2460 82000 Fail 0.0072 3 2391 79700 Fail 0.0073 3 2331 77700 Fail The development has an increase in flow durations from 1/2 Predeveloped 2 year flow to the 2 year flow or more than a 10% increase from the 2 year to the 50 year flow. The development has an increase in flow durations for more than 50% of the flows for the range of the duration analysis. Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:55:19 AM Page 24 Water Quality Water Quality BMP Flow and Volume for POC #2 On-line facility volume:0 acre-feet On-line facility target flow:0 cfs. Adjusted for 15 min:0 cfs. Off-line facility target flow:0 cfs. Adjusted for 15 min:0 cfs. Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:55:19 AM Page 25 LID Report Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:55:19 AM Page 26 Model Default Modifications Total of 0 changes have been made. PERLND Changes No PERLND changes have been made. IMPLND Changes No IMPLND changes have been made. Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:55:19 AM Page 27 Appendix Predeveloped Schematic Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:55:20 AM Page 28 Mitigated Schematic Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:55:20 AM Page 29 Predeveloped UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 Meadowvue - SDD_170925_bhb_mjh.wdm MESSU 25 PreMeadowvue - SDD_170925_bhb_mjh.MES 27 PreMeadowvue - SDD_170925_bhb_mjh.L61 28 PreMeadowvue - SDD_170925_bhb_mjh.L62 30 POCMeadowvue - SDD_170925_bhb_mjh1.dat 31 POCMeadowvue - SDD_170925_bhb_mjh2.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 11 COPY 501 COPY 502 DISPLY 1 DISPLY 2 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Basin 1 MAX 1 2 30 9 2 Basin 2 MAX 1 2 31 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 502 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 11 C, Forest, Mod 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 11 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:55:20 AM Page 30 <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 11 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 11 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 11 0 4.5 0.08 400 0.1 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 11 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 11 0.2 0.5 0.35 6 0.5 0.7 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 11 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN END IWAT-PARM3 Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:55:20 AM Page 31 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS END IWAT-STATE1 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Basin 1*** PERLND 11 4.872 COPY 501 12 PERLND 11 4.872 COPY 501 13 Basin 2*** PERLND 11 0.085 COPY 502 12 PERLND 11 0.085 COPY 502 13 ******Routing****** END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 COPY 502 OUTPUT MEAN 1 1 48.4 DISPLY 2 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> END HYDR-INIT END RCHRES SPEC-ACTIONS Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:55:20 AM Page 32 END SPEC-ACTIONS FTABLES END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 IMPLND 1 999 EXTNL PREC WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** COPY 501 OUTPUT MEAN 1 1 48.4 WDM 501 FLOW ENGL REPL COPY 502 OUTPUT MEAN 1 1 48.4 WDM 502 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 END MASS-LINK END RUN Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:55:20 AM Page 33 Mitigated UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 Meadowvue - SDD_170925_bhb_mjh.wdm MESSU 25 MitMeadowvue - SDD_170925_bhb_mjh.MES 27 MitMeadowvue - SDD_170925_bhb_mjh.L61 28 MitMeadowvue - SDD_170925_bhb_mjh.L62 31 POCMeadowvue - SDD_170925_bhb_mjh2.dat 30 POCMeadowvue - SDD_170925_bhb_mjh1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 17 IMPLND 2 RCHRES 1 COPY 502 COPY 1 COPY 501 COPY 601 DISPLY 2 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 2 Bypass East MAX 1 2 31 9 1 SSD Table 1 MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 502 1 1 501 1 1 601 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 17 C, Lawn, Mod 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:55:20 AM Page 34 # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 17 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 17 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 17 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 17 0 4.5 0.03 400 0.1 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 17 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 17 0.1 0.25 0.25 6 0.5 0.25 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 17 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 2 ROADS/MOD 1 1 1 27 0 END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** 2 0 0 1 0 0 0 END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* 2 0 0 4 0 0 0 1 9 END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** 2 0 0 0 0 0 END IWAT-PARM1 IWAT-PARM2 Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:55:20 AM Page 35 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC 2 400 0.05 0.1 0.08 END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN 2 0 0 END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS 2 0 0 END IWAT-STATE1 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Developed Site (Basin 1)*** PERLND 17 2.773 RCHRES 1 2 PERLND 17 2.773 RCHRES 1 3 IMPLND 2 2.099 RCHRES 1 5 Bypass West*** PERLND 17 0.043 COPY 501 12 PERLND 17 0.043 COPY 601 12 PERLND 17 0.043 COPY 501 13 PERLND 17 0.043 COPY 601 13 IMPLND 2 0.118 COPY 501 15 IMPLND 2 0.118 COPY 601 15 Bypass East*** PERLND 17 0.053 COPY 502 12 PERLND 17 0.053 COPY 502 13 IMPLND 2 0.032 COPY 502 15 ******Routing****** PERLND 17 2.773 COPY 1 12 IMPLND 2 2.099 COPY 1 15 PERLND 17 2.773 COPY 1 13 RCHRES 1 1 COPY 501 16 END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 502 OUTPUT MEAN 1 1 48.4 DISPLY 2 INPUT TIMSER 1 COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** 1 SSD Table 1 1 1 1 1 28 0 1 END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** 1 1 0 0 0 0 0 0 0 0 0 Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:55:20 AM Page 36 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* 1 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** 1 0 1 0 0 4 0 0 0 0 0 0 0 0 0 2 2 2 2 2 END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** 1 1 0.01 0.0 0.0 0.5 0.0 END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> 1 0 4.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES FTABLE 1 6 4 Depth Area Volume Outflow1 Velocity Travel Time*** (ft) (acres) (acre-ft) (cfs) (ft/sec) (Minutes)*** 0.000000 0.094192 0.000000 0.000000 0.600000 0.152594 0.074036 0.023730 2.600000 0.205441 0.432071 0.049397 4.600000 0.247091 0.884603 0.065705 6.600000 0.283551 1.415246 0.283931 7.280000 0.302564 1.614525 2.594178 END FTABLE 1 END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 IMPLND 1 999 EXTNL PREC WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP WDM 2 PREC ENGL 1 RCHRES 1 EXTNL PREC WDM 1 EVAP ENGL 0.76 RCHRES 1 EXTNL POTEV END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** COPY 1 OUTPUT MEAN 1 1 48.4 WDM 701 FLOW ENGL REPL COPY 501 OUTPUT MEAN 1 1 48.4 WDM 801 FLOW ENGL REPL COPY 601 OUTPUT MEAN 1 1 48.4 WDM 901 FLOW ENGL REPL COPY 2 OUTPUT MEAN 1 1 48.4 WDM 702 FLOW ENGL REPL COPY 502 OUTPUT MEAN 1 1 48.4 WDM 802 FLOW ENGL REPL COPY 602 OUTPUT MEAN 1 1 48.4 WDM 902 FLOW ENGL REPL RCHRES 1 HYDR RO 1 1 1 WDM 1000 FLOW ENGL REPL RCHRES 1 HYDR STAGE 1 1 1 WDM 1001 STAG ENGL REPL END EXT TARGETS Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:55:20 AM Page 37 MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 2 PERLND PWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 2 MASS-LINK 3 PERLND PWATER IFWO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 3 MASS-LINK 5 IMPLND IWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 5 MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 MASS-LINK 15 IMPLND IWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 15 MASS-LINK 16 RCHRES ROFLOW COPY INPUT MEAN END MASS-LINK 16 END MASS-LINK END RUN Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:55:20 AM Page 38 Predeveloped HSPF Message File Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:55:20 AM Page 39 Mitigated HSPF Message File Meadowvue - SDD_170925_bhb_mjh 9/26/2017 9:55:21 AM Page 40 Disclaimer Legal Notice This program and accompanying documentation are provided 'as-is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2017; All Rights Reserved. Clear Creek Solutions, Inc. 6200 Capitol Blvd. Ste F Olympia, WA. 98501 Toll Free 1(866)943-0304 Local (360)943-0304 www.clearcreeksolutions.com WWHM2012 PROJECT REPORT Meadowvue - Offsite Basin 8/18/2017 6:29:02 PM Page 2 General Model Information Project Name:Meadowvue - Offsite Basin Site Name: Site Address: City: Report Date:8/18/2017 Gage:Seatac Data Start:1948/10/01 Data End:2009/09/30 Timestep:15 Minute Precip Scale:0.00 (adjusted) Version Date:2016/02/25 Version:4.2.12 POC Thresholds Low Flow Threshold for POC1:50 Percent of the 2 Year High Flow Threshold for POC1:50 Year Meadowvue - Offsite Basin 8/18/2017 6:29:02 PM Page 3 Landuse Basin Data Predeveloped Land Use Basin 1 Bypass:No GroundWater:No Pervious Land Use acre C, Forest, Mod 9.407 Pervious Total 9.407 Impervious Land Use acre Impervious Total 0 Basin Total 9.407 Element Flows To: Surface Interflow Groundwater Meadowvue - Offsite Basin 8/18/2017 6:29:02 PM Page 4 Mitigated Land Use Basin 1 Bypass:No GroundWater:No Pervious Land Use acre C, Forest, Mod 4.966 C, Lawn, Mod 1.662 Pervious Total 6.628 Impervious Land Use acre ROADS MOD 2.211 ROOF TOPS FLAT 0.568 Impervious Total 2.779 Basin Total 9.407 Element Flows To: Surface Interflow Groundwater Meadowvue - Offsite Basin 8/18/2017 6:29:02 PM Page 5 Routing Elements Predeveloped Routing Meadowvue - Offsite Basin 8/18/2017 6:29:02 PM Page 6 Mitigated Routing Meadowvue - Offsite Basin 8/18/2017 6:29:02 PM Page 7 Analysis Results POC 1 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #1 Total Pervious Area:9.407 Total Impervious Area:0 Mitigated Landuse Totals for POC #1 Total Pervious Area:6.628 Total Impervious Area:2.779 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.280095 5 year 0.458961 10 year 0.573968 25 year 0.710774 50 year 0.805535 100 year 0.894046 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 1.400756 5 year 1.845303 10 year 2.163748 25 year 2.594535 50 year 2.936729 100 year 3.2977 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.322 2.000 1950 0.383 1.770 1951 0.612 1.269 1952 0.192 0.895 1953 0.155 0.962 1954 0.238 1.144 1955 0.381 1.242 1956 0.307 1.160 1957 0.247 1.466 1958 0.275 1.096 Meadowvue - Offsite Basin 8/18/2017 6:29:53 PM Page 8 1959 0.236 1.071 1960 0.422 1.428 1961 0.232 1.204 1962 0.145 0.916 1963 0.198 1.257 1964 0.281 1.133 1965 0.187 1.453 1966 0.180 0.999 1967 0.430 1.888 1968 0.242 2.001 1969 0.236 1.275 1970 0.189 1.315 1971 0.213 1.544 1972 0.465 1.658 1973 0.206 0.867 1974 0.228 1.491 1975 0.318 1.517 1976 0.227 1.242 1977 0.033 1.101 1978 0.192 1.449 1979 0.116 1.799 1980 0.547 2.463 1981 0.172 1.317 1982 0.355 2.053 1983 0.303 1.451 1984 0.183 1.006 1985 0.108 1.244 1986 0.480 1.331 1987 0.424 1.635 1988 0.167 0.980 1989 0.111 1.557 1990 1.014 3.164 1991 0.538 2.416 1992 0.220 1.102 1993 0.214 1.072 1994 0.072 0.943 1995 0.307 1.185 1996 0.710 1.902 1997 0.548 1.442 1998 0.134 1.280 1999 0.601 2.818 2000 0.213 1.356 2001 0.038 1.414 2002 0.248 1.682 2003 0.370 1.825 2004 0.395 2.690 2005 0.293 1.214 2006 0.330 1.172 2007 0.767 2.827 2008 0.934 2.345 2009 0.436 1.678 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 1.0143 3.1639 2 0.9345 2.8267 3 0.7666 2.8185 Meadowvue - Offsite Basin 8/18/2017 6:29:53 PM Page 9 4 0.7103 2.6898 5 0.6120 2.4631 6 0.6010 2.4163 7 0.5481 2.3453 8 0.5469 2.0525 9 0.5380 2.0011 10 0.4800 2.0001 11 0.4646 1.9022 12 0.4357 1.8876 13 0.4301 1.8248 14 0.4237 1.7993 15 0.4222 1.7705 16 0.3949 1.6823 17 0.3826 1.6778 18 0.3807 1.6575 19 0.3696 1.6354 20 0.3547 1.5566 21 0.3296 1.5440 22 0.3224 1.5174 23 0.3177 1.4913 24 0.3073 1.4656 25 0.3067 1.4531 26 0.3034 1.4510 27 0.2930 1.4489 28 0.2814 1.4417 29 0.2749 1.4276 30 0.2475 1.4137 31 0.2475 1.3561 32 0.2421 1.3313 33 0.2383 1.3172 34 0.2357 1.3150 35 0.2356 1.2805 36 0.2322 1.2748 37 0.2282 1.2690 38 0.2270 1.2572 39 0.2197 1.2440 40 0.2144 1.2419 41 0.2135 1.2419 42 0.2135 1.2141 43 0.2059 1.2043 44 0.1984 1.1854 45 0.1920 1.1717 46 0.1918 1.1599 47 0.1891 1.1442 48 0.1870 1.1329 49 0.1827 1.1016 50 0.1797 1.1005 51 0.1717 1.0959 52 0.1673 1.0717 53 0.1552 1.0705 54 0.1445 1.0058 55 0.1341 0.9988 56 0.1161 0.9798 57 0.1107 0.9617 58 0.1085 0.9435 59 0.0720 0.9161 60 0.0383 0.8947 61 0.0333 0.8668 Meadowvue - Offsite Basin 8/18/2017 6:29:53 PM Page 10 Meadowvue - Offsite Basin 8/18/2017 6:29:53 PM Page 11 Duration Flows Flow(cfs)Predev Mit Percentage Pass/Fail 0.1400 17088 67204 393 Fail 0.1468 15650 63503 405 Fail 0.1535 14144 59461 420 Fail 0.1602 12823 55696 434 Fail 0.1669 11736 52574 447 Fail 0.1737 10607 49258 464 Fail 0.1804 9625 46178 479 Fail 0.1871 8763 43355 494 Fail 0.1938 8128 41152 506 Fail 0.2005 7394 38821 525 Fail 0.2073 6755 36553 541 Fail 0.2140 6256 34735 555 Fail 0.2207 5777 32789 567 Fail 0.2274 5332 30971 580 Fail 0.2342 4928 29281 594 Fail 0.2409 4616 27891 604 Fail 0.2476 4267 26437 619 Fail 0.2543 3961 25004 631 Fail 0.2610 3645 23635 648 Fail 0.2678 3420 22501 657 Fail 0.2745 3153 21243 673 Fail 0.2812 2924 20110 687 Fail 0.2879 2733 19235 703 Fail 0.2947 2507 18174 724 Fail 0.3014 2329 17231 739 Fail 0.3081 2136 16343 765 Fail 0.3148 1996 15633 783 Fail 0.3215 1833 14887 812 Fail 0.3283 1706 14106 826 Fail 0.3350 1594 13496 846 Fail 0.3417 1454 12827 882 Fail 0.3484 1333 12207 915 Fail 0.3552 1234 11621 941 Fail 0.3619 1158 11163 963 Fail 0.3686 1091 10624 973 Fail 0.3753 1022 10138 991 Fail 0.3820 947 9681 1022 Fail 0.3888 891 9304 1044 Fail 0.3955 831 8902 1071 Fail 0.4022 763 8489 1112 Fail 0.4089 727 8164 1122 Fail 0.4157 678 7818 1153 Fail 0.4224 627 7501 1196 Fail 0.4291 589 7174 1217 Fail 0.4358 557 6894 1237 Fail 0.4425 507 6607 1303 Fail 0.4493 470 6314 1343 Fail 0.4560 431 6096 1414 Fail 0.4627 389 5848 1503 Fail 0.4694 357 5606 1570 Fail 0.4762 328 5390 1643 Fail 0.4829 301 5206 1729 Fail 0.4896 272 4984 1832 Fail 0.4963 242 4774 1972 Fail Meadowvue - Offsite Basin 8/18/2017 6:29:53 PM Page 12 0.5030 218 4586 2103 Fail 0.5098 199 4402 2212 Fail 0.5165 176 4220 2397 Fail 0.5232 152 4057 2669 Fail 0.5299 132 3916 2966 Fail 0.5367 119 3747 3148 Fail 0.5434 105 3600 3428 Fail 0.5501 95 3450 3631 Fail 0.5568 85 3328 3915 Fail 0.5635 75 3185 4246 Fail 0.5703 69 3069 4447 Fail 0.5770 62 2967 4785 Fail 0.5837 54 2864 5303 Fail 0.5904 46 2725 5923 Fail 0.5972 39 2637 6761 Fail 0.6039 31 2571 8293 Fail 0.6106 25 2464 9856 Fail 0.6173 22 2366 10754 Fail 0.6240 20 2286 11430 Fail 0.6308 18 2222 12344 Fail 0.6375 14 2138 15271 Fail 0.6442 12 2070 17250 Fail 0.6509 10 2014 20140 Fail 0.6576 7 1936 27657 Fail 0.6644 7 1882 26885 Fail 0.6711 7 1814 25914 Fail 0.6778 6 1760 29333 Fail 0.6845 6 1704 28400 Fail 0.6913 6 1651 27516 Fail 0.6980 6 1608 26800 Fail 0.7047 6 1562 26033 Fail 0.7114 5 1510 30200 Fail 0.7181 5 1465 29300 Fail 0.7249 5 1427 28540 Fail 0.7316 5 1383 27660 Fail 0.7383 5 1337 26740 Fail 0.7450 5 1287 25740 Fail 0.7518 5 1256 25120 Fail 0.7585 4 1210 30250 Fail 0.7652 4 1178 29450 Fail 0.7719 3 1142 38066 Fail 0.7786 3 1108 36933 Fail 0.7854 3 1082 36066 Fail 0.7921 3 1051 35033 Fail 0.7988 3 1017 33900 Fail 0.8055 3 980 32666 Fail The development has an increase in flow durations from 1/2 Predeveloped 2 year flow to the 2 year flow or more than a 10% increase from the 2 year to the 50 year flow. The development has an increase in flow durations for more than 50% of the flows for the range of the duration analysis. Meadowvue - Offsite Basin 8/18/2017 6:29:53 PM Page 13 Water Quality Water Quality BMP Flow and Volume for POC #1 On-line facility volume:0 acre-feet On-line facility target flow:0 cfs. Adjusted for 15 min:0 cfs. Off-line facility target flow:0 cfs. Adjusted for 15 min:0 cfs. Meadowvue - Offsite Basin 8/18/2017 6:29:53 PM Page 14 LID Report Meadowvue - Offsite Basin 8/18/2017 6:30:10 PM Page 15 Model Default Modifications Total of 0 changes have been made. PERLND Changes No PERLND changes have been made. IMPLND Changes No IMPLND changes have been made. Meadowvue - Offsite Basin 8/18/2017 6:30:10 PM Page 16 Appendix Predeveloped Schematic Meadowvue - Offsite Basin 8/18/2017 6:30:11 PM Page 17 Mitigated Schematic Meadowvue - Offsite Basin 8/18/2017 6:30:12 PM Page 18 Predeveloped UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 Meadowvue - Offsite Basin.wdm MESSU 25 PreMeadowvue - Offsite Basin.MES 27 PreMeadowvue - Offsite Basin.L61 28 PreMeadowvue - Offsite Basin.L62 30 POCMeadowvue - Offsite Basin1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 11 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Basin 1 MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 11 C, Forest, Mod 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 11 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 11 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO Meadowvue - Offsite Basin 8/18/2017 6:30:12 PM Page 19 PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 11 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 11 0 4.5 0.08 400 0.1 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 11 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 11 0.2 0.5 0.35 6 0.5 0.7 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 11 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS END IWAT-STATE1 Meadowvue - Offsite Basin 8/18/2017 6:30:12 PM Page 20 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Basin 1*** PERLND 11 9.407 COPY 501 12 PERLND 11 9.407 COPY 501 13 ******Routing****** END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 IMPLND 1 999 EXTNL PREC Meadowvue - Offsite Basin 8/18/2017 6:30:12 PM Page 21 WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** COPY 501 OUTPUT MEAN 1 1 48.4 WDM 501 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 END MASS-LINK END RUN Meadowvue - Offsite Basin 8/18/2017 6:30:12 PM Page 22 Mitigated UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 Meadowvue - Offsite Basin.wdm MESSU 25 MitMeadowvue - Offsite Basin.MES 27 MitMeadowvue - Offsite Basin.L61 28 MitMeadowvue - Offsite Basin.L62 30 POCMeadowvue - Offsite Basin1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 11 PERLND 17 IMPLND 2 IMPLND 4 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Basin 1 MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 11 C, Forest, Mod 1 1 1 1 27 0 17 C, Lawn, Mod 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 11 0 0 1 0 0 0 0 0 0 0 0 0 17 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO Meadowvue - Offsite Basin 8/18/2017 6:30:12 PM Page 23 <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 11 0 0 4 0 0 0 0 0 0 0 0 0 1 9 17 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 11 0 0 0 0 0 0 0 0 0 0 0 17 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 11 0 4.5 0.08 400 0.1 0.5 0.996 17 0 4.5 0.03 400 0.1 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 11 0 0 2 2 0 0 0 17 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 11 0.2 0.5 0.35 6 0.5 0.7 17 0.1 0.25 0.25 6 0.5 0.25 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 11 0 0 0 0 2.5 1 0 17 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 2 ROADS/MOD 1 1 1 27 0 4 ROOF TOPS/FLAT 1 1 1 27 0 END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** 2 0 0 1 0 0 0 4 0 0 1 0 0 0 END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* 2 0 0 4 0 0 0 1 9 4 0 0 4 0 0 0 1 9 END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** Meadowvue - Offsite Basin 8/18/2017 6:30:12 PM Page 24 2 0 0 0 0 0 4 0 0 0 0 0 END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC 2 400 0.05 0.1 0.08 4 400 0.01 0.1 0.1 END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN 2 0 0 4 0 0 END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS 2 0 0 4 0 0 END IWAT-STATE1 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Basin 1*** PERLND 11 4.966 COPY 501 12 PERLND 11 4.966 COPY 501 13 PERLND 17 1.662 COPY 501 12 PERLND 17 1.662 COPY 501 13 IMPLND 2 2.211 COPY 501 15 IMPLND 4 0.568 COPY 501 15 ******Routing****** END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* END PRINT-INFO Meadowvue - Offsite Basin 8/18/2017 6:30:12 PM Page 25 HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 IMPLND 1 999 EXTNL PREC WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** COPY 1 OUTPUT MEAN 1 1 48.4 WDM 701 FLOW ENGL REPL COPY 501 OUTPUT MEAN 1 1 48.4 WDM 801 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 MASS-LINK 15 IMPLND IWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 15 END MASS-LINK END RUN Meadowvue - Offsite Basin 8/18/2017 6:30:12 PM Page 26 Predeveloped HSPF Message File Meadowvue - Offsite Basin 8/18/2017 6:30:12 PM Page 27 Mitigated HSPF Message File Meadowvue - Offsite Basin 8/18/2017 6:30:12 PM Page 28 Disclaimer Legal Notice This program and accompanying documentation are provided 'as-is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2017; All Rights Reserved. Clear Creek Solutions, Inc. 6200 Capitol Blvd. Ste F Olympia, WA. 98501 Toll Free 1(866)943-0304 Local (360)943-0304 www.clearcreeksolutions.com Site Planning Civil Engineering Project Management Land Development Consulting APPENDIX C CONVEYANCE CALCULATIONS APPENDIX C.1 - CPH Rational Calculations 10 yr 25 yr 100yr Project Name: Meadowvue aR 2.44 2.66 2.61 bR 0.64 0.65 0.63 PR 3 3.4 3.9 Description: Rational calculation spreadsheet for backwater analysis CB35 10689 0.25 0.90 0.18 0.25 0.07 0.72 0.02 17.00 2.08 50.00 0.40 6.30 0.82 3.19 0.25 0.56 3.99 CB40 12739 0.29 0.90 0.21 0.25 0.08 0.72 0.02 17.00 2.08 50.00 0.40 6.30 0.82 3.19 0.29 0.67 1.11 CB45 2314 0.05 0.90 0.04 0.25 0.01 0.72 0.02 17.00 2.08 50.00 0.40 6.30 0.82 3.19 0.05 0.12 0.44 CB46 2272 0.05 0.90 0.04 0.25 0.01 0.72 0.02 17.00 2.08 50.00 0.40 6.30 0.82 3.19 0.05 0.12 0.31 CB60 3701 0.08 0.90 0.06 0.25 0.02 0.72 0.02 17.00 2.08 50.00 0.40 6.30 0.82 3.19 0.08 0.19 0.19 CB30 3973 0.09 0.90 0.07 0.25 0.03 0.72 0.02 17.00 2.08 50.00 0.40 6.30 0.82 3.19 0.09 0.21 2.32 CB31 52794 1.21 0.90 0.48 0.25 0.73 0.51 0.03 17.00 2.69 50.00 0.31 6.30 0.82 3.19 1.21 1.97 2.11 CB32 3786 0.09 0.90 0.03 0.25 0.05 0.51 0.03 17.00 2.69 50.00 0.31 6.30 0.82 3.19 0.09 0.14 0.14 CB15 5132 0.12 0.90 0.08 0.25 0.03 0.72 0.01 17.00 1.20 50.00 0.69 6.30 0.82 3.19 0.12 0.27 5.91 CB25 1388 0.03 0.90 0.02 0.25 0.01 0.72 0.01 17.00 1.20 50.00 0.69 6.30 0.82 3.19 0.03 0.07 5.64 CB20 9.5 0.00 0.90 0.00 0.25 0.00 0.72 0.02 17.00 2.40 50.00 0.35 6.30 0.82 3.19 0.00 5.57 5.57 CB41 47489 1.09 0.90 0.78 0.25 0.31 0.72 0.01 17.00 1.20 50.00 0.69 6.30 0.82 3.19 1.09 2.50 2.50 CB50 4986 0.11 0.90 0.08 0.25 0.03 0.72 0.02 17.00 2.08 50.00 0.40 6.30 0.82 3.19 0.11 0.26 0.26 RD TO POND 41549 0.95 0.90 0.38 0.25 0.57 0.51 0.04 17.00 3.40 50.00 0.25 6.30 0.82 3.19 0.95 1.55 1.55 KCBW KCBW KCBW KCBW Travel Time Used (minutes) IR KCBW Qf Full (cfs) iR KCBW Length of Pipe (feet) Diameter of Pipe (inches) Manning's Value "n" Velocity Full (fps) (NOAA Atlas - Isopluvial Maps: Figures 27,28,30) Q Basin (cfs) Slope of Pipe (ft/ft) Velocity (fps) Length of Flowpath (feet) KCBW KCBW Qt Total (cfs) Cc To CB KCBW Q RatioTravel Time (minutes) Flowpath Slope (ft/ft) A2 (acres) KCBW kR (KCSWDM Table 3.2.1.C) AC Total Area Qf/Qt KCBW At (acres)SF KCBW KCBW KCBW CPH Project No.: 0035-15-012 Basin / Subbasin C1 A1 (acres)C2 Senza Lakeview Rational_3515012 170818 CPH Consultants 10/9/2017 1 Appendix C.2 - CPH Backwater Calculations 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Design Flow Q Length Pipe Size Manning's n Downstream Invert Elevation Upstream Inlet Elevation Pipe Slope Barrel Area Barrel Velocity Barrel Velocity Head TW Elevation Barrel Perimeter Friction Slope Friction Loss Entrance HGL Elevation Entrance Loss Coefficient Entrance Head Loss Exit Head Loss Outlet Control Elevation dc/D Critical Depth Critical Velocity Inlet Control Elevation Approach Velocity Head Kb Bend Head Loss Q3/Q1 Kj Junction Head Loss Head Water Rim Elevation Overflow? D/S CB U/S CB (cfs)(ft)(in)(ft)(ft)(ft/ft)(sq. ft)(fps)(ft)(ft)(ft)Sf (ft)(ft)ke (ft)(ft)(ft)(ft)(fps)(ft)(ft)(ft)(%)(ft)(ft)(ft) POND CB35 3.99 73.64 18 0.012 376.40 381.33 0.067 1.77 2.26 0.08 386.50 4.71 0.00 0.09 386.59 0.50 0.04 0.08 386.71 0.57 0.86 5.25 382.24 0.03 0.00 0.000 0%0.00 0.00 386.68 391.62 Contained CB35 CB40 1.11 189.66 12 0.012 381.83 396.66 0.078 0.79 1.41 0.03 386.68 3.14 0.00 0.16 397.66 0.50 0.02 0.03 397.71 0.57 0.57 4.28 397.53 0.00 0.00 0.000 0%0.00 0.00 397.70 400.04 Contained CB40 CB45 0.44 220.85 12 0.012 396.66 404.25 0.034 0.79 0.56 0.00 397.70 3.14 0.00 0.03 405.25 0.50 0.00 0.00 405.26 0.57 0.57 4.28 405.10 0.00 0.00 0.000 0%0.00 0.00 405.25 407.87 Contained CB45 CB46 0.31 36.38 12 0.012 404.25 405.18 0.026 0.79 0.40 0.00 405.25 3.14 0.00 0.00 406.18 0.50 0.00 0.00 406.18 0.57 0.57 4.28 406.03 0.00 0.00 0.000 0%0.00 0.00 406.18 408.43 Contained CB46 CB60 0.19 54.94 12 0.012 405.18 408.34 0.058 0.79 0.25 0.00 406.18 3.14 0.00 0.00 409.34 0.50 0.00 0.00 409.34 0.57 0.57 4.28 409.17 0.00 0.00 0.000 0%0.00 0.00 409.34 411.62 Contained CB35 CB30 2.32 111 12 0.012 381.83 384.55 0.025 0.79 2.95 0.14 386.68 3.14 0.00 0.40 387.07 0.50 0.07 0.14 387.28 0.57 0.57 4.28 385.57 0.00 0.00 0.000 0%0.00 0.00 387.28 388.24 Contained CB30 CB31 2.11 20.91 12 0.012 384.55 385.11 0.027 0.79 2.69 0.11 387.28 3.14 0.00 0.06 387.34 0.50 0.06 0.11 387.51 0.57 0.57 4.28 386.10 0.00 0.00 0.000 0%0.00 0.00 387.51 388.11 Contained CB31 CB32 0.14 47.05 12 0.012 385.11 387.09 0.042 0.79 0.18 0.00 387.51 3.14 0.00 0.00 388.09 0.50 0.00 0.00 388.09 0.57 0.57 4.28 387.93 0.00 0.00 0.000 0%0.00 0.00 388.09 390.41 Contained CB25 CB20 5.57 199 18 0.012 383.20 392.00 0.044 1.77 3.15 0.15 380.71 4.71 0.00 0.47 393.50 0.50 0.08 0.15 393.73 0.57 0.86 5.25 392.97 0.15 0.00 0.000 0%0.00 0.00 393.58 395.38 Contained CB20 INLET 5.57 21 18 0.012 392.00 394.00 0.095 1.77 3.15 0.15 393.58 4.71 0.00 0.05 395.50 0.50 0.08 0.15 395.73 0.57 0.86 5.25 394.95 0.05 0.00 0.000 0%0.00 0.00 395.68 395.90 Contained OUTFALL CB15 8.91 44 18 0.012 378.35 378.57 0.005 1.77 5.04 0.39 379.90 4.71 0.01 0.27 380.17 0.50 0.20 0.39 380.76 0.57 0.86 5.25 380.04 0.04 0.00 0.000 0%0.00 0.00 380.71 382.41 Contained CB15 CB25 8.64 120.75 18 0.012 378.57 379.19 0.005 1.77 4.89 0.37 378.40 4.71 0.01 0.69 380.69 0.50 0.19 0.37 381.25 0.57 0.86 5.25 380.61 0.04 0.00 0.000 0%0.00 0.00 381.20 387.46 Contained CB25 CS100 3.00 41 18 0.012 379.19 379.39 0.005 1.77 1.70 0.04 380.71 4.71 0.00 0.03 380.89 0.50 0.02 0.04 380.96 0.57 0.86 5.25 380.30 0.00 0.00 0.000 0%0.00 0.00 380.96 386.68 Contained CS100 POND 3.00 49.38 18 0.012 379.39 378.00 -0.028 1.77 1.70 0.04 380.96 4.71 0.00 0.03 380.99 0.50 0.02 0.04 381.06 0.57 0.86 5.25 378.92 0.00 0.00 0.000 0%0.00 0.00 381.06 386.68 Contained CB40 CB41 2.50 24.48 12 0.012 396.66 396.79 0.005 0.79 3.18 0.16 397.70 3.14 0.00 0.10 397.80 0.50 0.08 0.16 398.04 0.57 0.57 4.28 397.84 0.00 0.00 0.000 0%0.00 0.00 398.04 400.04 Contained CULVERT OUTFALL CB50 0.26 44.55 12 0.012 399.88 400.11 0.005 0.79 0.33 0.00 400.88 3.14 0.00 0.00 401.11 0.50 0.00 0.00 401.11 0.57 0.57 4.28 400.97 0.00 0.00 0.000 0%0.00 0.00 401.11 402.64 Contained POND RD 1.55 405 8 0.01 383 401 0.044 0.35 4.45 0.31 386.68 2.09 0.01 3.91 401.67 0.50 0.15 0.31 402.13 0.57 0.38 3.50 403.16 0.00 0.00 0.000 0%0.00 0.00 403.16 404 Contained PIPE SEGMENT DESCRIPTION:Storm drain conveyance system for Meadowvue: Backwater Spreadsheet. PROJECT: DATE: CPH PROJECT No. Meadowvue 10/9/2017 0035-15-012 Site Planning Civil Engineering Project Management Land Development Consulting APPENDIX D OFFSITE ANALYSIS OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE CITY OF RENTON SURFACE WATER DESIGN MANUAL, CORE REQUIREMENT #2 Basin: Lake Washington Subbasin Name: Lower Cedar River Subbasin Number: - Symbol Drainage Component Type, Name, and Size Drainage Component Description Slope Distance from site discharge Existing Problems Potential Problems Observations of field inspector, resource reviewer, or resident see map Type: sheet flow, swale, stream, channel, pipe, pond; Size: diameter, surface area drainage basin, vegetation, cover, depth, type of sensitive area, volume % ¼ ml = 1,320 ft. constrictions, under capacity, ponding, overtopping, flooding, habitat or organism destruction, scouring, bank sloughing, sedimentation, incision, other erosion tributary area, likelihood of problem, overflow pathways, potential im pacts 1 Sheet Flow Runoff flows southwesterly across site and enters ditch along east side of 154th Ave SE ~5% 0’ None observed No problems observed, see photos #1 through #3 2 Open channel flow in ditch Runoff flows in ditch passing through several culverts ~2% 0’ – 920’ Potential flooding Storms may cause flooding due to undersized culvert See photos #4 through #7 3 12” Culvert Runoff passes underneath SE 142nd Street through 12” culvert and enters catch basin ~2% 920’ – 955’ None observed No problems observed, see photos #8 4 Catch Basin Runoff enters catch basin in ditch, downstream path could not be followed further due to private property but is believed to flow southeast in pipes before discharging to creek 955’ None observed No problems observed, see photo #9 2/6/2017 PROJECT SITE11/4 MILE DOWNSTREAMN234EXISTING CREEK MeadowVue Preliminary Technical Information Report City of Renton Appendix E CPH Project No. 0035-15-012 February 6, 2017 CP|H CONSULTANTS Page 1 Photo #1: Existing conditions on-site Photo #2: Southwest property corner MeadowVue Preliminary Technical Information Report City of Renton Appendix E CPH Project No. 0035-15-012 February 6, 2017 CP|H CONSULTANTS Page 2 Photo #3: Looking southwest at 154th Ave SE, photo taken at southwest property corner Photo #4: Looking south at ditch on east side of 154th Ave SE MeadowVue Preliminary Technical Information Report City of Renton Appendix E CPH Project No. 0035-15-012 February 6, 2017 CP|H CONSULTANTS Page 3 Photo #5: Looking south at ditch on east side of 154th Ave SE Photo #6: Looking southwest, runoff in ditch crosses underneath 154th Ave SE through culvert MeadowVue Preliminary Technical Information Report City of Renton Appendix E CPH Project No. 0035-15-012 February 6, 2017 CP|H CONSULTANTS Page 4 Photo #7: Looking west at ditch along north side of SE 142nd Street Photo #8: Looking south, runoff in ditch crosses underneath SE 142nd Street through 12” culvert MeadowVue Preliminary Technical Information Report City of Renton Appendix E CPH Project No. 0035-15-012 February 6, 2017 CP|H CONSULTANTS Page 5 Photo #9: Looking east at catch basin on south side of SE 142nd Street, culvert in previous photo enters structure. From here runoff is believed to flow south through pipes before discharging to creek. FILE NO .: NAME: PHONE: ADDRESS: DATE OF INVESTIGATION: INVESTIGATED BY : Virgil Pacampara 2011-1008 WATER AND LAND RESOURCES DRAINAGE INVESTIGATION REPORT FIELD INVESTIGATION King County Water and Land Resources Division Department of Natural Resources and Parks SE Jones Roadand 254th Place, Renton, 98058 Jennifer Vanderhoof 11 -10 -2011 NTS 206.263.6533 I went to the site on 11/10/2011 at 1:00 PM and investigated an illegal dumping. The complaint was about dumping of two large television sets at the end of the roadway , right in front of a road block sign that says “No Dumping”. I saw the two television sets at the edge of a turn-around area/culdesac of 149th Ave. SE. I spoke to Mr. Billy Emerson, the property owner of house # 1506 149 th Ave. SE. about the alleged illegal dumping. He told me that the dumping appeared to have happened during late night, and noticed it the following day. That he installed the “No Dumping Sign” to eliminate the illegal dumping on the site , but it appears that people still dumped stuff on the site. It appeared that the spot of the dumping is located within the road right of way of King County . I gave him our business card to call us incase it happens again . He gave his and his wife’s phone numbers (his 206.661.3432; Patti- 360-990-6617 ) for the records. I went to the other site as indicated on the complaint reports/e-mail. The second site is the location of a regional facility (DR0535). The site is along the paved walking trail that is parallel and north side of I -169 (between 149th Ave. SE and 150th Lane SE.). I did not see any illegal dumping on the site particularly along the north end of cross culvert (concrete box culvert) and on the swale. I spoke to Sandra of KC Roads emergency number (206 .296 .8100) on afternoon of 11/18/2011, and reported the result of the investigation. Sandra told me that the KC-Roads will take care of the complaints and will remove the televisions on the site . Emerson # 15016 This is the first site where the two television was allegedly dumped illegally along the road right of way. A “No Dumping” sign was installed by Mr. Emerson to eliminate illegal dumping it still re-occuring. This is the second site. I did not see any illegal dumping on the site. The site is a regional facility. 3 6 21 4 5 KrNc Couxrv W¡.rnR Awn L¡.Nu RnsouRCES DrvrstoN D nnT.¡nGE INVESTIGATIoN REPORT INVESTIGATIoT Rrouesr .PROBLCV: POND QUESTION TYPC .FCS Recerveo sv: BS/wkp Date: 51412016 OK'd by:Fire No 2016-0515 Neve: Joseph Mihalek Phone : 425-830-2545 Other Address: 15222 SE JONES RD City State Zip 98058 Mr. Mihalek lives next hoor to the facilty that was built as part of the bridge project. He says the construction of the facility included the installation of a liner to hold water. The pond was maintained recently and he says the facility is dry now whereas it used to hold water almost all year. He thinks the maintenance may have punched through the liner. Determine if the liner was required and if it is still intact or if there was another reason the pond was holding water. 7 /t/r r, Access Permission Granted REMARKS: ._ (Pond is a Combined weVlive storage with a geomembrane liner) DT0240 Elliott Bridge 3166 Replacement - B Plat name: Lot No: Call First (Would Like To Be Called and/or Present) I Block No: No field investigation requiredOther agencies involved: Q-S-T-R MD NW-23-23-5 Pargas¡n LCn Council Dist I Charge #: Parcel# 2323059089 Kroll: 816W TBros: 65744 Citizen notified on \ t AAY )ptu phone letter rn person i+r¡ cd email ,r.¡¿c:suj 1l 'l4l Ì \le' (>Ëû^ALrM\\Mu,.r tÀ +:,tì>;.'ù ? i,r.r.rcÎurtr.) . f+ u'ò -T('l ôì f t'rr-Þ trò 15-?[rr /v\rGtrl l{Q uu: CCI¡JÊrnqù) lo r.¡ u D bsult Ê16r) li rvr R. A4i ttn rr"ñ , q¡¡-ua,>f>7u'.uí ..-rt¡h St Turned to: ï) *4¡fì'l 'l*r {- notified OR: No further action recommended because: -Îi*;TåA\,tr'¡ 1èÇs3¿ , t[O Qc4 lìn i /Ui Lead agency has been Problem has been o problem has been corrected I erVate problem - NDAP will not consider because: n Water originates onsite and/or on neighboring parcel. n Location is outside WLRD Service Area I Otner (Specify): Prior investigation addresses problem SEE FILE # {r?) ct f)r: pf dr{.cv.,^r lDi} - '''-:i r\ c-"ç-J âr¡: cn¡.¿-l..'t*- ¿'flo\ Q <-'"-t( S -' ing County partment of Natural Resources FILE No.: 2016-0515 ADDRESS: 15222 SE JONES ROAd and Parks r añd Land Resources Division NAME:Joseph Mihalek PHONE:425 5'45 DRAINAGE ¡NVESTIGATION REPORT FIELD INVESTIGATION DATE OF INVESTIGATION Mav 12.2016 Responded to drainage inquiry from Mr. Mihalek that the pond next to his house DT0240 which he observed to have water in it all or most of the time was now devoid of water. He was concerned that the crew which had recently worked the pond had punctured the liner installed when the pond was built. My investigation found the pond actually had standing water in the bottom, as it is a combined weUlive storage pond with a geomembrane liner. Refer to attached photos for standing water observed. All components of the facility appeared to be in good condition and working order. Will monitor when in the area from time to time. NTS Told Mr. Mihalek that we might need to wait until the rainy season for further in depth investigation. li,. l{¡l'iIftt I lEl ï¡ H IEI Hjli, ff..1A¡.II ? IIt Comp by: Ron Ainslie 12 Ùlay 2016 Photo 1 Drainage Investigation Repot 20 l6-05 I 5 Photo 2 Photo of water in the pond Photo 4 Photo of water in the pond Photo 6 Photo 3 Photo of water in the pond and facility sign Photo 5 FACILITY SKETCH DT0240 112057s BASIN Lower Cedar FACILITY NUMBER TB PAGE 657p.4 TYPE KROLL PAGE 1t22t13 tf, KinsCounty Department of Natural Resources Water and Land Resource Division MATNTENANcE DrvrsroN 4 DATE INITIALS - CTM ADDRESS 15226 SE Jones Rd NAME -12"D| 4',-12"Dt ¿\ lStormfilte r It c NTS Wetland c Wetland c cB-2 15222 48'-12"D| cB-3 "-",9 uu'Y 51',-12"Dt cB-5 ROW <3: CB ROW *""^ Qq The hformation inchded onthìs map has bem cmpled by King Cænty staff frm a variety of serces and is subjæt to changewithilt notice. King County makæ no repræentatitrs or rerantiæ, spESS orimpl¡ed, as to æcuEc)1 comfletáæs, tirnelñæs,tr rillìts to the use of such informatiffi. This dæumerìt b not intended ftr use æ a survey product. Xin! Crunty shall not be liablef* any gmøal, spæial, hdirect, incidental, orconsequtrt¡al dilages including, but not liîited to, lost revenues or bst pþfitsesulting frm the we ø mbuse of the iñfomatbn cfita¡ned m this map. Any sale of th¡s map orinfrmâtion onthis map ¡sprolìb¡ted except by written permissim of King Cænty.Date:5/4i2016 Notes:\fl rins CountyGIS CnNrEnNAPOND QUESTIONS - 15226 SE Jones Rd i.! +: ¡lit 1.1:,¿a in.: ii.i: i t.z l i ¡ìa PI z COAL;I'LD PARI( ¡J rl: & ¿;-'.s': \'l-:ra L(' \27¡i1rt sï 4th nz 6iô -¿ !-Nif:i È5i -\r I l+i¡( S.- rr 5E 1nd 2nd'Pi ' 5a 5i ci 4r lii;à z 2nd stâ o 5E132nd Si. PI jiSih PI 5E sEl r 37ih Sl rl iSldù 5Ë. . 1 40th I r'<=¿ 5i...140ih . 5'¡: _o 5: t2irir'Fi ¡lrll 1 st il i-,i- -Je t¿znd 1 71Cù Fi !i- 1;"lLiit'l zGooi 2¡¡i , .5r' 9¿- oz :h PI 5Ê si .,1.- th rl l I i I 5t l39th P¡5E 5i 2+.h i2 li l2nd sll sll 5Ë1 5E 1: i..:;,sÊ I i4ih 5È 135ilr 5i sËi st\i€JE i 3úih JL 3i ti1 r 5E 13Bih< r6'"r! Ë la z N Iil) i I I I I = )r 't Jlnd 5t ¡ìi;] i ,., 1.,. '2.3^ ,ra- ?{'fr 1 ¡: ¡ .iJ l40i¡ iNé.PLEVVOOD HÊIGHIS PK I z'- ¡: 5! ii-?r.-i Pl 5- €q ' ^L\I -\ i;', a1)' '\,L1 5-si i 3ir¡ 1Á i1J¿ !i S:; 5i i4 lsi )r I r5! i i I J' 2¡-c St h si lilrd ,r,,fiii,!;,-,,r:,-l i¡i. fí. ¡ 1l I 46ih + 5Éf PI + ti,l¡¡l49ih ç7 È--*3J 1 -Á5 th c. <ı q@ s"1{-:.¡- 7/; .. Þ.'r.J{' ç,- ^,rt" 5E 144ih. 5Ë tr-:" -Ð' 16S 169 G (Ð J^"9, 5i ..--<._ sE1 PI PI 26 -îL 1þ8t¡ i 5Ê 171si Si 2 SE r70ìh Ci 3 153ih Cr SE 161.u' Êr\= MC6ARVÊY PARI( sr 25 '= i 16!4- si Ë'*- 5Ë 16lrd *1, @ø Jr rJ' æ \laDA = fVIAPLE VALLEY HEIGIIT5 PK 3è. l¡' s_-Ë _1.q5!r Wy DEL,tiÌ a t1 t,j¿ú) 701h 5t qr ðí.- \ìi¿. 30 l_t¡r i 5PRI¡JG t(É F¡.P.f<D!5IRÉ ;t >- : r_i sr: ff'fli$ -&I'F'T O L9z = 2 3 &<i € uU I q Ê Site Planning Civil Engineering Project Management Land Development Consulting APPENDIX E OTHER REPORTS Critical Areas Determination Report, by Acre Environmental Consulting, LLC, September 13, 2016 Arborist Report/Tree Plan, by S.A. Newman, January 16, 2017 CRITICAL AREAS DETERMINATION FOR D.R. Horton – Meadowview 13833 156th Avenue SE Tax Parcel No. 146340-0060 Acre Project #16048 Prepared By: Acre Environmental Consulting, LLC. 17715 28th Ave. NE Lake Forest Park, WA 98155 (206) 450-7746 For: D.R. Horton 12910 Totem Lake Blvd. NE, Suite 220 Kirkland, WA 98034 September 13, 2016 Acre Environmental Consulting, LLC September 13, 2016 Critical Areas Determination for D.R. Horton - Meadowview Renton, WA Page 1 SITE DESCRIPTION On September 12, 2016 Acre Environmental Consulting, LLC visited the approximate 4.54-acre site located at 13833 156th Avenue SE in the City of Renton, Washington. The site is further located as a portion of Section 14, Township 23N, Range 5E, W.M. The parcel number for this property is 146340-0060. The purpose of this site visit was to locate and assess regulated critical areas on and adjacent to the subject site. Surrounding land use is comprised of single- family residential development and pasture. There are no wetlands or streams located on or adjacent to the subject site. Acre Environmental Consulting, LLC used the routine methodologies described in the Washington State Wetlands Identification and Delineation Manual (Washington State Department of Ecology Publication #96-94, March 1997) to make a determination regarding the presence of regulated wetlands on the site. In addition, Acre Environmental Consulting, LLC evaluated the site using the U.S. Army Corps of Engineers Wetland Delineation Manual produced in 1987 and the U.S. Army Corps of Engineers Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Western Mountains, Valleys, and Coast Region produced in May 2010. Access to this site from the east via 156th Avenue SE located along the eastern border of the property. This site has a gentle west aspect. A single-family residence and associated infrastructure are located in the east-central part of the property. The rest of the site is occupied by actively grazed pasture with scattered big leaf maple (Acer macrophyllum, FacU). Typical vegetation in the pasture is represented by small patches of Himalayan blackberry (Rubus armeniacus, Fac) with colonial bentgrass (Agrostis capillaris, Fac), velvetgrass (Holcus lanatus, Fac), tall fescue (Schedonorus arundinaceus, Fac), creeping buttercup (Ranunculus repens, Fac), common Tansy (Tanacetum vulgare, FacU), purple dead-nettle (Lamium purpureum, Nol/ Upl), English plantain (Plantago lanceolata, FacU), and white clover (Trifolium repens, Fac). Typical soils on the site have a Munsell color of dark brown (10YR 3/3), with a texture of sandy loam from 0 to 18 inches below the surface. Soils were dry throughout the profile during our September 12, 2016 site investigation. No wetlands or streams are located on the subject site, and there are no adjacent wetlands or streams that would extend buffers on to the subject site. Acre Environmental Consulting, LLC September 13, 2016 Critical Areas Determination for D.R. Horton - Meadowview Renton, WA Page 2 TERMS & CONDITIONS The environmental consulting work conducted, including this Critical Areas Determination letter (collectively the “Services”) is supplied to D.R. Horton (the “Client”) as a means of determining whether any wetlands, streams, and/or fish and wildlife habitats regulated by the City of Renton Critical Areas Regulations exist on, or adjacent to the site. The Services are provided in accordance with the following General Terms and Conditions (the “Terms”). In accepting the Services provided by Acre Environmental Consulting, LLC (“Acre”), the Client voluntarily enters into and agrees to the binding effect of the following Terms. This report is intended to provide information deemed relevant in the Client's attempt to comply with the regulations currently in effect. The work for this report has conformed to the standard of care employed by professional ecologists in the Pacific Northwest. All other representations or warranties, whether express or implied, are hereby disclaimed concerning the work or this report. This report is based largely on readily observable conditions and, to a lesser extent, on readily ascertainable conditions. No attempt has been made to determine hidden or concealed conditions. If such conditions exist or arise, the information contained in this report may be rendered inaccurate or incomplete based upon those conditions. Acre acts solely as an independent contractor in providing the Services to the Client, and nothing in the provision of such Services shall be construed as creating an agency, partnership, joint venture or other similar legal relationship between Acre and the Client. Please note that Acre did not provide detailed analyses of other permitting requirements not discussed in this report (i.e., structural, drainage, geotechnical, or engineering requirements). The laws applicable to Critical Areas are subject to varying interpretations. While Acre observed professional industry standards when completing this review, the information included in this report does not guarantee approval by any federal, state, and/or local permitting agencies. Therefore, all work on this property should not commence until permits have been obtained from all applicable agencies. If there are any questions regarding this report, please contact me at 206.450.7746. Acre Environmental Consulting, LLC. Louis Emenhiser Principal Wetland Ecologist Professional Wetland Scientist #1680 Site Planning Civil Engineering Project Management Land Development Consulting APPENDIX F INDIVIDUAL ON-LOT BMP ANALYSIS MeadowvueIndividual Lot BMPs(sf) (% Lot Area) (sf) (% Lot Area)Basic Dispersion Trench (LF)****Rain Garden (sf)Permeable Pvmt. (sf)Basic Dispersion Trench (LF)****Rain Garden (sf)Permeable Pvmt. (sf)1 11810 2362 5905 3170 26.8% 830 7.0% 1532 22 77 1532 34 118 23622 9916 992 4958 4010 40.4% 0 0.0% 992 14 50 992 14 50 9923 9912 991 4956 3530 35.6% 470 4.7% 521 10 26 521 14 50 9914 9909 991 4955 3665 37.0% 335 3.4% 656 10 33 656 14 50 9915 9905 991 4953 3985 40.2% 15 0.2% 976 14 49 976 14 50 9916 9901 990 4951 3595 36.3% 405 4.1% 585 10 29 585 14 50 9907 9898 990 4949 3575 36.1% 425 4.3% 565 10 28 565 14 49 9908 11645 2329 5823 3085 26.5% 915 7.9% 1414 20 71 1414 33 116 23299 10754 1075 5377 3160 29.4% 840 7.8% 235 10 12 235 15 54 107510 9632 963 4816 3575 37.1% 425 4.4% 538 10 27 538 14 48 96311 9636 964 4818 3580 37.2% 420 4.4% 544 10 27 544 14 48 96412 9639 964 4820 3500 36.3% 500 5.2% 464 10 23 464 14 48 96413 9642 964 4821 3660 38.0% 340 3.5% 624 10 31 624 14 48 96414 9645 965 4823 3980 41.3% 20 0.2% 945 13 47 945 14 48 965Alternate BMP Facility Min. Size as Standalone (sf)Remainder Imperv. Area for Alt. BMP (sf)***Target Impervious Mitigated by Restricted Footprint BMP **Alternate BMP Facility Min. Size for Remainder (sf)Lot No. Lot Area (sf)Lot Imperv. Surface Required for BMP Treatment (sf)*50% Max. Impervious Allowed (RMC 4-2-110A)Proposed Lot Impervious Coverage* Lot impervious required to be treated by on-lot BMPs is equal to 10% of the lot area for lots up to 11,000 square feet in size and 20% of the lot area for those that are 11,000 to 22,000 square feet. ** Target impervious area being mitigated by Restricted Footprint BMP is equal to the maximum allowed impervious area per RMC 4-2-110A or 4,000 square feet, whichever is smaller, less the proposed lot impervious area.*** Remainder impervious area is the difference between the lot impervious surface required for treatment less the value of the target impervious surface being treated by the Reduced Impervious Surface Credit.****Basic Dispersion Trench is a gravel filled trench receiving 700 sf of impervious per 10LF length of trench with a minimumvegetated flowpath of 25 feet.CPH Project No. 0035-15-012Printed: 8/18/2017Page 1 of 1 Site Planning Civil Engineering Project Management Land Use Consulting APPENDIX G BOND QUANTITY WORKSHEET CED Permit #:C17-002646 Unit Reference #Price Unit Quantity Cost Backfill & compaction-embankment ESC-1 6.50$ CY Check dams, 4" minus rock ESC-2 SWDM 5.4.6.3 80.00$ Each 61 4,880.00 Catch Basin Protection ESC-3 35.50$ Each 20 710.00 Crushed surfacing 1 1/4" minus ESC-4 WSDOT 9-03.9(3)95.00$ CY Ditching ESC-5 9.00$ CY Excavation-bulk ESC-6 2.00$ CY Fence, silt ESC-7 SWDM 5.4.3.1 1.50$ LF 2450 3,675.00 Fence, Temporary (NGPE)ESC-8 1.50$ LF 1600 2,400.00 Geotextile Fabric ESC-9 2.50$ SY Hay Bale Silt Trap ESC-10 0.50$ Each Hydroseeding ESC-11 SWDM 5.4.2.4 0.80$ SY Interceptor Swale / Dike ESC-12 1.00$ LF 2765 2,765.00 Jute Mesh ESC-13 SWDM 5.4.2.2 3.50$ SY Level Spreader ESC-14 1.75$ LF Mulch, by hand, straw, 3" deep ESC-15 SWDM 5.4.2.1 2.50$ SY Mulch, by machine, straw, 2" deep ESC-16 SWDM 5.4.2.1 2.00$ SY Piping, temporary, CPP, 6"ESC-17 12.00$ LF Piping, temporary, CPP, 8"ESC-18 14.00$ LF Piping, temporary, CPP, 12"ESC-19 18.00$ LF 80 1,440.00 Plastic covering, 6mm thick, sandbagged ESC-20 SWDM 5.4.2.3 4.00$ SY 1000 4,000.00 Rip Rap, machine placed; slopes ESC-21 WSDOT 9-13.1(2)45.00$ CY 6 270.00 Rock Construction Entrance, 50'x15'x1'ESC-22 SWDM 5.4.4.1 1,800.00$ Each Rock Construction Entrance, 100'x15'x1'ESC-23 SWDM 5.4.4.1 3,200.00$ Each 1 3,200.00 Sediment pond riser assembly ESC-24 SWDM 5.4.5.2 2,200.00$ Each 1 2,200.00 Sediment trap, 5' high berm ESC-25 SWDM 5.4.5.1 19.00$ LF 75 1,425.00 Sed. trap, 5' high, riprapped spillway berm section ESC-26 SWDM 5.4.5.1 70.00$ LF Seeding, by hand ESC-27 SWDM 5.4.2.4 1.00$ SY 4000 4,000.00 Sodding, 1" deep, level ground ESC-28 SWDM 5.4.2.5 8.00$ SY Sodding, 1" deep, sloped ground ESC-29 SWDM 5.4.2.5 10.00$ SY TESC Supervisor ESC-30 110.00$ HR 80 8,800.00 Water truck, dust control ESC-31 SWDM 5.4.7 140.00$ HR 40 5,600.00 Unit Reference #Price Unit Quantity Cost EROSION/SEDIMENT SUBTOTAL:45,365.00 SALES TAX @ 10%4,536.50 EROSION/SEDIMENT TOTAL:49,901.50 (A) SITE IMPROVEMENT BOND QUANTITY WORKSHEET FOR EROSION & SEDIMENT CONTROL Description No. (A) WRITE-IN-ITEMS Page 2 of 13 Ref 8-H Bond Quantity Worksheet SECTION II.a EROSION_CONTROL Unit Prices Updated: 06/14/2016 Version: 04/26/2017 Printed 11/6/2017 CED Permit #:C17-002646 Existing Future Public Private Right-of-Way Improvements Improvements (D) (E) Description No. Unit Price Unit Quant.Cost Quant.Cost Quant.Cost Quant.Cost GENERAL ITEMS Backfill & Compaction- embankment GI-1 6.00$ CY Backfill & Compaction- trench GI-2 9.00$ CY Clear/Remove Brush, by hand (SY)GI-3 1.00$ SY Bollards - fixed GI-4 240.74$ Each Bollards - removable GI-5 452.34$ Each Clearing/Grubbing/Tree Removal GI-6 10,000.00$ Acre 0.5 5,000.00 1.06 10,600.00 3.48 34,800.00 Excavation - bulk GI-7 2.00$ CY 500 1,000.00 750 1,500.00 28000 56,000.00 Excavation - Trench GI-8 5.00$ CY Fencing, cedar, 6' high GI-9 20.00$ LF 130 2,600.00 Fencing, chain link, 4'GI-10 38.31$ LF Fencing, chain link, vinyl coated, 6' high GI-11 20.00$ LF 380 7,600.00 Fencing, chain link, gate, vinyl coated, 20' GI-12 1,400.00$ Each 1 1,400.00 Fill & compact - common barrow GI-13 25.00$ CY Fill & compact - gravel base GI-14 27.00$ CY Fill & compact - screened topsoil GI-15 39.00$ CY Gabion, 12" deep, stone filled mesh GI-16 65.00$ SY Gabion, 18" deep, stone filled mesh GI-17 90.00$ SY Gabion, 36" deep, stone filled mesh GI-18 150.00$ SY Grading, fine, by hand GI-19 2.50$ SY Grading, fine, with grader GI-20 2.00$ SY 1400 2,800.00 3600 7,200.00 10000 20,000.00 Monuments, 3' Long GI-21 250.00$ Each 2 500.00 Sensitive Areas Sign GI-22 7.00$ Each Sodding, 1" deep, sloped ground GI-23 8.00$ SY 465 3,720.00 820 6,560.00 10000 80,000.00 Surveying, line & grade GI-24 850.00$ Day 0.5 425.00 0.5 425.00 Surveying, lot location/lines GI-25 1,800.00$ Acre 3.48 6,264.00 Topsoil Type A (imported)GI-26 28.50$ CY 500 14,250.00 Traffic control crew ( 2 flaggers )GI-27 120.00$ HR 40 4,800.00 Trail, 4" chipped wood GI-28 8.00$ SY Trail, 4" crushed cinder GI-29 9.00$ SY Trail, 4" top course GI-30 12.00$ SY Conduit, 2"GI-31 5.00$ LF Wall, retaining, concrete GI-32 55.00$ SF 2810 154,550.00 Wall, rockery GI-33 15.00$ SF SUBTOTAL THIS PAGE:13,445.00 26,285.00 382,264.00 (B)(C)(D)(E) SITE IMPROVEMENT BOND QUANTITY WORKSHEET FOR STREET AND SITE IMPROVEMENTS Quantity Remaining (Bond Reduction) (B)(C) Page 3 of 13 Ref 8-H Bond Quantity Worksheet SECTION II.b TRANSPORTATION Unit Prices Updated: 06/14/2016 Version: 04/26/2017 Printed 11/6/2017 CED Permit #:C17-002646 Existing Future Public Private Right-of-Way Improvements Improvements (D) (E) Description No. Unit Price Unit Quant.Cost Quant.Cost Quant.Cost Quant.Cost SITE IMPROVEMENT BOND QUANTITY WORKSHEET FOR STREET AND SITE IMPROVEMENTS Quantity Remaining (Bond Reduction) (B)(C) ROAD IMPROVEMENT/PAVEMENT/SURFACING AC Grinding, 4' wide machine < 1000sy RI-1 30.00$ SY 355 10,650.00 AC Grinding, 4' wide machine 1000-2000sy RI-2 16.00$ SY AC Grinding, 4' wide machine > 2000sy RI-3 10.00$ SY AC Removal/Disposal RI-4 35.00$ SY 220 7,700.00 Barricade, Type III ( Permanent )RI-5 56.00$ LF 2 112.00 Guard Rail RI-6 30.00$ LF Curb & Gutter, rolled RI-7 17.00$ LF Curb & Gutter, vertical RI-8 12.50$ LF 580 7,250.00 1200 15,000.00 Curb and Gutter, demolition and disposal RI-9 18.00$ LF Curb, extruded asphalt RI-10 5.50$ LF Curb, extruded concrete RI-11 7.00$ LF Sawcut, asphalt, 3" depth RI-12 1.85$ LF 775 1,433.75 Sawcut, concrete, per 1" depth RI-13 3.00$ LF Sealant, asphalt RI-14 2.00$ LF 340 680.00 Shoulder, gravel, 4" thick RI-15 15.00$ SY Sidewalk, 4" thick RI-16 38.00$ SY 156 5,928.00 807 30,666.00 Sidewalk, 4" thick, demolition and disposal RI-17 32.00$ SY Sidewalk, 5" thick RI-18 41.00$ SY Sidewalk, 5" thick, demolition and disposal RI-19 40.00$ SY Sign, Handicap RI-20 85.00$ Each Striping, per stall RI-21 7.00$ Each Striping, thermoplastic, ( for crosswalk )RI-22 3.00$ SF 67 201.00 Striping, 4" reflectorized line RI-23 0.50$ LF 144 72.00 Additional 2.5" Crushed Surfacing RI-24 3.60$ SY HMA 1/2" Overlay 1.5" RI-25 14.00$ SY HMA 1/2" Overlay 2"RI-26 18.00$ SY 355 6,390.00 HMA Road, 2", 4" rock, First 2500 SY RI-27 28.00$ SY HMA Road, 2", 4" rock, Qty. over 2500SY RI-28 21.00$ SY HMA Road, 4", 6" rock, First 2500 SY RI-29 45.00$ SY 985 44,325.00 1680 75,600.00 HMA Road, 4", 6" rock, Qty. over 2500 SY RI-30 37.00$ SY HMA Road, 4", 4.5" ATB RI-31 38.00$ SY Gravel Road, 4" rock, First 2500 SY RI-32 15.00$ SY Gravel Road, 4" rock, Qty. over 2500 SY RI-33 10.00$ SY Thickened Edge RI-34 8.60$ LF SUBTOTAL THIS PAGE:84,741.75 121,266.00 (B)(C)(D)(E) Page 4 of 13 Ref 8-H Bond Quantity Worksheet SECTION II.b TRANSPORTATION Unit Prices Updated: 06/14/2016 Version: 04/26/2017 Printed 11/6/2017 CED Permit #:C17-002646 Existing Future Public Private Right-of-Way Improvements Improvements (D) (E) Description No. Unit Price Unit Quant.Cost Quant.Cost Quant.Cost Quant.Cost SITE IMPROVEMENT BOND QUANTITY WORKSHEET FOR STREET AND SITE IMPROVEMENTS Quantity Remaining (Bond Reduction) (B)(C) PARKING LOT SURFACING No. 2" AC, 2" top course rock & 4" borrow PL-1 21.00$ SY 2" AC, 1.5" top course & 2.5" base course PL-2 28.00$ SY 4" select borrow PL-3 5.00$ SY 1.5" top course rock & 2.5" base course PL-4 14.00$ SY SUBTOTAL PARKING LOT SURFACING: (B)(C)(D)(E) LANDSCAPING & VEGETATION No. Street Trees LA-1 7,734.00$ LS 1 7,734.00 1 7,734.00 Median Landscaping LA-2 Right-of-Way Landscaping LA-3 4,110.00$ LS 1 4,110.00 Wetland Landscaping LA-4 SUBTOTAL LANDSCAPING & VEGETATION:4,110.00 7,734.00 7,734.00 (B)(C)(D)(E) TRAFFIC & LIGHTING No. Signs TR-1 100.00$ EA 10 1,000.00 11 1,100.00 Street Light System ( # of Poles)TR-2 9,000.00$ EA 5 45,000.00 9 81,000.00 Traffic Signal TR-3 Traffic Signal Modification TR-4 SUBTOTAL TRAFFIC & LIGHTING:46,000.00 82,100.00 (B)(C)(D)(E) WRITE-IN-ITEMS Misc. Landscaping 102,734.00$ LS 1 102,734.00 SUBTOTAL WRITE-IN ITEMS:102,734.00 STREET AND SITE IMPROVEMENTS SUBTOTAL:148,296.75 237,385.00 492,732.00 SALES TAX @ 10%14,829.68 23,738.50 49,273.20 STREET AND SITE IMPROVEMENTS TOTAL:163,126.43 261,123.50 542,005.20 (B)(C)(D)(E) Page 5 of 13 Ref 8-H Bond Quantity Worksheet SECTION II.b TRANSPORTATION Unit Prices Updated: 06/14/2016 Version: 04/26/2017 Printed 11/6/2017 CED Permit #:C17-002646 Existing Future Public Private Right-of-Way Improvements Improvements (D) (E) Description No. Unit Price Unit Quant.Cost Quant.Cost Quant.Cost Quant.Cost DRAINAGE (CPE = Corrugated Polyethylene Pipe, N12 or Equivalent) For Culvert prices, Average of 4' cover was assumed. Assume perforated PVC is same price as solid pipe.) Access Road, R/D D-1 26.00$ SY 163 4,238.00 * (CBs include frame and lid) Beehive D-2 90.00$ Each Through-curb Inlet Framework D-3 400.00$ Each CB Type I D-4 1,500.00$ Each 5 7,500.00 6 9,000.00 CB Type IL D-5 1,750.00$ Each CB Type II, 48" diameter D-6 2,300.00$ Each 1 2,300.00 1 2,300.00 for additional depth over 4' D-7 480.00$ FT 6 2,880.00 8 3,840.00 CB Type II, 54" diameter D-8 2,500.00$ Each for additional depth over 4'D-9 495.00$ FT CB Type II, 60" diameter D-10 2,800.00$ Each 1 2,800.00 for additional depth over 4'D-11 600.00$ FT 3.5 2,100.00 CB Type II, 72" diameter D-12 6,000.00$ Each for additional depth over 4'D-13 850.00$ FT CB Type II, 96" diameter D-14 14,000.00$ Each for additional depth over 4'D-15 925.00$ FT Trash Rack, 12"D-16 350.00$ Each Trash Rack, 15"D-17 410.00$ Each Trash Rack, 18"D-18 480.00$ Each Trash Rack, 21"D-19 550.00$ Each Cleanout, PVC, 4"D-20 150.00$ Each Cleanout, PVC, 6"D-21 170.00$ Each 4 680.00 Cleanout, PVC, 8"D-22 200.00$ Each Culvert, PVC, 4" D-23 10.00$ LF Culvert, PVC, 6" D-24 13.00$ LF 900 11,700.00 Culvert, PVC, 8" D-25 15.00$ LF Culvert, PVC, 12" D-26 23.00$ LF Culvert, PVC, 15" D-27 35.00$ LF Culvert, PVC, 18" D-28 41.00$ LF Culvert, PVC, 24"D-29 56.00$ LF Culvert, PVC, 30" D-30 78.00$ LF Culvert, PVC, 36" D-31 130.00$ LF Culvert, CMP, 8"D-32 19.00$ LF Culvert, CMP, 12"D-33 29.00$ LF SUBTOTAL THIS PAGE:12,680.00 24,278.00 12,380.00 (B)(C)(D)(E) SITE IMPROVEMENT BOND QUANTITY WORKSHEET FOR DRAINAGE AND STORMWATER FACILITIES Quantity Remaining (Bond Reduction) (B)(C) Page 6 of 13 Ref 8-H Bond Quantity Worksheet SECTION II.c DRAINAGE Unit Prices Updated: 06/14/2016 Version: 04/26/2017 Printed 11/6/2017 CED Permit #:C17-002646 Existing Future Public Private Right-of-Way Improvements Improvements (D) (E) Description No. Unit Price Unit Quant.Cost Quant.Cost Quant.Cost Quant.Cost SITE IMPROVEMENT BOND QUANTITY WORKSHEET FOR DRAINAGE AND STORMWATER FACILITIES Quantity Remaining (Bond Reduction) (B)(C) DRAINAGE (Continued) Culvert, CMP, 15"D-34 35.00$ LF Culvert, CMP, 18"D-35 41.00$ LF Culvert, CMP, 24"D-36 56.00$ LF Culvert, CMP, 30"D-37 78.00$ LF Culvert, CMP, 36"D-38 130.00$ LF Culvert, CMP, 48"D-39 190.00$ LF Culvert, CMP, 60"D-40 270.00$ LF Culvert, CMP, 72"D-41 350.00$ LF Culvert, Concrete, 8"D-42 42.00$ LF Culvert, Concrete, 12"D-43 48.00$ LF Culvert, Concrete, 15"D-44 78.00$ LF Culvert, Concrete, 18"D-45 48.00$ LF Culvert, Concrete, 24"D-46 78.00$ LF Culvert, Concrete, 30"D-47 125.00$ LF Culvert, Concrete, 36"D-48 150.00$ LF Culvert, Concrete, 42"D-49 175.00$ LF Culvert, Concrete, 48"D-50 205.00$ LF Culvert, CPE Triple Wall, 6" D-51 14.00$ LF Culvert, CPE Triple Wall, 8" D-52 16.00$ LF Culvert, CPE Triple Wall, 12" D-53 24.00$ LF Culvert, CPE Triple Wall, 15" D-54 35.00$ LF Culvert, CPE Triple Wall, 18" D-55 41.00$ LF Culvert, CPE Triple Wall, 24" D-56 56.00$ LF Culvert, CPE Triple Wall, 30" D-57 78.00$ LF Culvert, CPE Triple Wall, 36" D-58 130.00$ LF Culvert, LCPE, 6"D-59 60.00$ LF Culvert, LCPE, 8"D-60 72.00$ LF Culvert, LCPE, 12"D-61 84.00$ LF 45 3,780.00 767 64,428.00 Culvert, LCPE, 15"D-62 96.00$ LF Culvert, LCPE, 18"D-63 108.00$ LF 385 41,580.00 160 17,280.00 Culvert, LCPE, 24"D-64 120.00$ LF Culvert, LCPE, 30"D-65 132.00$ LF Culvert, LCPE, 36"D-66 144.00$ LF Culvert, LCPE, 48"D-67 156.00$ LF Culvert, LCPE, 54"D-68 168.00$ LF SUBTOTAL THIS PAGE:45,360.00 81,708.00 (B)(C)(D)(E) Page 7 of 13 Ref 8-H Bond Quantity Worksheet SECTION II.c DRAINAGE Unit Prices Updated: 06/14/2016 Version: 04/26/2017 Printed 11/6/2017 CED Permit #:C17-002646 Existing Future Public Private Right-of-Way Improvements Improvements (D) (E) Description No. Unit Price Unit Quant.Cost Quant.Cost Quant.Cost Quant.Cost SITE IMPROVEMENT BOND QUANTITY WORKSHEET FOR DRAINAGE AND STORMWATER FACILITIES Quantity Remaining (Bond Reduction) (B)(C) DRAINAGE (Continued) Culvert, LCPE, 60"D-69 180.00$ LF Culvert, LCPE, 72"D-70 192.00$ LF Culvert, HDPE, 6"D-71 42.00$ LF Culvert, HDPE, 8"D-72 42.00$ LF Culvert, HDPE, 12"D-73 74.00$ LF Culvert, HDPE, 15"D-74 106.00$ LF Culvert, HDPE, 18"D-75 138.00$ LF Culvert, HDPE, 24"D-76 221.00$ LF Culvert, HDPE, 30"D-77 276.00$ LF Culvert, HDPE, 36"D-78 331.00$ LF Culvert, HDPE, 48"D-79 386.00$ LF Culvert, HDPE, 54"D-80 441.00$ LF Culvert, HDPE, 60"D-81 496.00$ LF Culvert, HDPE, 72"D-82 551.00$ LF Pipe, Polypropylene, 6"D-83 84.00$ LF Pipe, Polypropylene, 8"D-84 89.00$ LF Pipe, Polypropylene, 12"D-85 95.00$ LF Pipe, Polypropylene, 15"D-86 100.00$ LF Pipe, Polypropylene, 18"D-87 106.00$ LF Pipe, Polypropylene, 24"D-88 111.00$ LF Pipe, Polypropylene, 30"D-89 119.00$ LF Pipe, Polypropylene, 36"D-90 154.00$ LF Pipe, Polypropylene, 48"D-91 226.00$ LF Pipe, Polypropylene, 54"D-92 332.00$ LF Pipe, Polypropylene, 60"D-93 439.00$ LF Pipe, Polypropylene, 72"D-94 545.00$ LF Culvert, DI, 6"D-95 61.00$ LF Culvert, DI, 8"D-96 84.00$ LF Culvert, DI, 12"D-97 106.00$ LF Culvert, DI, 15"D-98 129.00$ LF Culvert, DI, 18"D-99 152.00$ LF Culvert, DI, 24"D-100 175.00$ LF Culvert, DI, 30"D-101 198.00$ LF Culvert, DI, 36"D-102 220.00$ LF Culvert, DI, 48"D-103 243.00$ LF Culvert, DI, 54"D-104 266.00$ LF Culvert, DI, 60"D-105 289.00$ LF Culvert, DI, 72"D-106 311.00$ LF SUBTOTAL THIS PAGE: (B)(C)(D)(E) Page 8 of 13 Ref 8-H Bond Quantity Worksheet SECTION II.c DRAINAGE Unit Prices Updated: 06/14/2016 Version: 04/26/2017 Printed 11/6/2017 CED Permit #:C17-002646 Existing Future Public Private Right-of-Way Improvements Improvements (D) (E) Description No. Unit Price Unit Quant.Cost Quant.Cost Quant.Cost Quant.Cost SITE IMPROVEMENT BOND QUANTITY WORKSHEET FOR DRAINAGE AND STORMWATER FACILITIES Quantity Remaining (Bond Reduction) (B)(C) Specialty Drainage Items Ditching SD-1 9.50$ CY Flow Dispersal Trench (1,436 base+)SD-3 28.00$ LF French Drain (3' depth)SD-4 26.00$ LF Geotextile, laid in trench, polypropylene SD-5 3.00$ SY Mid-tank Access Riser, 48" dia, 6' deep SD-6 2,000.00$ Each Pond Overflow Spillway SD-7 16.00$ SY 20 320.00 Restrictor/Oil Separator, 12"SD-8 1,150.00$ Each Restrictor/Oil Separator, 15"SD-9 1,350.00$ Each Restrictor/Oil Separator, 18"SD-10 1,700.00$ Each 1 1,700.00 Riprap, placed SD-11 42.00$ CY Tank End Reducer (36" diameter)SD-12 1,200.00$ Each Infiltration pond testing SD-13 125.00$ HR Permeable Pavement SD-14 Permeable Concrete Sidewalk SD-15 Culvert, Box __ ft x __ ft SD-16 SUBTOTAL SPECIALTY DRAINAGE ITEMS:2,020.00 (B)(C)(D)(E) STORMWATER FACILITIES (Include Flow Control and Water Quality Facility Summary Sheet and Sketch) Detention Pond SF-1 0.50$ Each 70329 35,164.50 Detention Tank SF-2 Each Detention Vault SF-3 Each Infiltration Pond SF-4 Each Infiltration Tank SF-5 Each Infiltration Vault SF-6 Each Infiltration Trenches SF-7 Each Basic Biofiltration Swale SF-8 Each Wet Biofiltration Swale SF-9 Each Wetpond SF-10 0.50$ Each 8636.3 4,318.15 Wetvault SF-11 Each Sand Filter SF-12 Each Sand Filter Vault SF-13 Each Linear Sand Filter SF-14 Each Proprietary Facility SF-15 Each Bioretention Facility SF-16 Each SUBTOTAL STORMWATER FACILITIES:39,482.65 (B)(C)(D)(E) Page 9 of 13 Ref 8-H Bond Quantity Worksheet SECTION II.c DRAINAGE Unit Prices Updated: 06/14/2016 Version: 04/26/2017 Printed 11/6/2017 CED Permit #:C17-002646 Existing Future Public Private Right-of-Way Improvements Improvements (D) (E) Description No. Unit Price Unit Quant.Cost Quant.Cost Quant.Cost Quant.Cost SITE IMPROVEMENT BOND QUANTITY WORKSHEET FOR DRAINAGE AND STORMWATER FACILITIES Quantity Remaining (Bond Reduction) (B)(C) WRITE-IN-ITEMS (INCLUDE ON-SITE BMPs) WI-1 WI-2 WI-3 WI-4 WI-5 WI-6 WI-7 WI-8 WI-9 WI-10 WI-11 WI-12 WI-13 WI-14 WI-15 SUBTOTAL WRITE-IN ITEMS: DRAINAGE AND STORMWATER FACILITIES SUBTOTAL:58,040.00 147,488.65 12,380.00 SALES TAX @ 10%5,804.00 14,748.87 1,238.00 DRAINAGE AND STORMWATER FACILITIES TOTAL:63,844.00 162,237.52 13,618.00 (B)(C)(D)(E) Page 10 of 13 Ref 8-H Bond Quantity Worksheet SECTION II.c DRAINAGE Unit Prices Updated: 06/14/2016 Version: 04/26/2017 Printed 11/6/2017 CED Permit #:C17-002646 Existing Future Public Private Right-of-Way Improvements Improvements (D) (E) Description No. Unit Price Unit Quant.Cost Quant.Cost Quant.Cost Quant.Cost Connection to Existing Watermain W-1 2,000.00$ Each Ductile Iron Watermain, CL 52, 4 Inch Diameter W-2 50.00$ LF Ductile Iron Watermain, CL 52, 6 Inch Diameter W-3 56.00$ LF Ductile Iron Watermain, CL 52, 8 Inch Diameter W-4 60.00$ LF Ductile Iron Watermain, CL 52, 10 Inch Diameter W-5 70.00$ LF Ductile Iron Watermain, CL 52, 12 Inch Diameter W-6 80.00$ LF Gate Valve, 4 inch Diameter W-7 500.00$ Each Gate Valve, 6 inch Diameter W-8 700.00$ Each Gate Valve, 8 Inch Diameter W-9 800.00$ Each Gate Valve, 10 Inch Diameter W-10 1,000.00$ Each Gate Valve, 12 Inch Diameter W-11 1,200.00$ Each Fire Hydrant Assembly W-12 4,000.00$ Each Permanent Blow-Off Assembly W-13 1,800.00$ Each Air-Vac Assembly, 2-Inch Diameter W-14 2,000.00$ Each Air-Vac Assembly, 1-Inch Diameter W-15 1,500.00$ Each Compound Meter Assembly 3-inch Diameter W-16 8,000.00$ Each Compound Meter Assembly 4-inch Diameter W-17 9,000.00$ Each Compound Meter Assembly 6-inch Diameter W-18 10,000.00$ Each Pressure Reducing Valve Station 8-inch to 10-inch W-19 20,000.00$ Each WATER SUBTOTAL: SALES TAX @ 10% WATER TOTAL: (B)(C)(D)(E) SITE IMPROVEMENT BOND QUANTITY WORKSHEET FOR WATER Quantity Remaining (Bond Reduction) (B)(C) Page 11 of 13 Ref 8-H Bond Quantity Worksheet SECTION II.d WATER Unit Prices Updated: 06/14/2016 Version: 04/26/2017 Printed 11/6/2017 CED Permit #:C17-002646 Existing Future Public Private Right-of-Way Improvements Improvements (D) (E) Description No. Unit Price Unit Quant.Cost Quant.Cost Quant.Cost Quant.Cost Clean Outs SS-1 1,000.00$ Each 14 14,000.00 Grease Interceptor, 500 gallon SS-2 8,000.00$ Each Grease Interceptor, 1000 gallon SS-3 10,000.00$ Each Grease Interceptor, 1500 gallon SS-4 15,000.00$ Each Side Sewer Pipe, PVC. 4 Inch Diameter SS-5 80.00$ LF Side Sewer Pipe, PVC. 6 Inch Diameter SS-6 95.00$ LF 395 37,525.00 Sewer Pipe, PVC, 8 inch Diameter SS-7 105.00$ LF 337 35,385.00 1297 136,185.00 Sewer Pipe, PVC, 12 Inch Diameter SS-8 120.00$ LF Sewer Pipe, DI, 8 inch Diameter SS-9 115.00$ LF Sewer Pipe, DI, 12 Inch Diameter SS-10 130.00$ LF Manhole, 48 Inch Diameter SS-11 6,000.00$ Each 4 24,000.00 2 12,000.00 Manhole, 54 Inch Diameter SS-13 6,500.00$ Each Manhole, 60 Inch Diameter SS-15 7,500.00$ Each Manhole, 72 Inch Diameter SS-17 8,500.00$ Each Manhole, 96 Inch Diameter SS-19 14,000.00$ Each Pipe, C-900, 12 Inch Diameter SS-21 180.00$ LF Outside Drop SS-24 1,500.00$ LS Inside Drop SS-25 1,000.00$ LS Sewer Pipe, PVC, ____ Inch Diameter SS-26 Lift Station (Entire System)SS-27 LS SANITARY SEWER SUBTOTAL:59,385.00 148,185.00 51,525.00 SALES TAX @ 10%5,938.50 14,818.50 5,152.50 SANITARY SEWER TOTAL:65,323.50 163,003.50 56,677.50 (B)(C)(D)(E) SITE IMPROVEMENT BOND QUANTITY WORKSHEET FOR SANITARY SEWER Quantity Remaining (Bond Reduction) (B)(C) Page 12 of 13 Ref 8-H Bond Quantity Worksheet SECTION II.e SANITARY SEWER Unit Prices Updated: 06/14/2016 Version: 04/26/2017 Printed 11/6/2017 Planning Division |1055 South Grady Way – 6 th Floor | Renton, WA 98057 (425) 430-7200 Date: Name:Project Name: PE Registration No:CED Plan # (LUA): Firm Name:CED Permit # (U): Firm Address:Site Address: Phone No.Parcel #(s): Email Address:Project Phase: Site Restoration/Erosion Sediment Control Subtotal (a) Existing Right-of-Way Improvements Subtotal (b)(b)228,449.93$ Future Public Improvements Subtotal (c)424,127.00$ Stormwater & Drainage Facilities (Public & Private) Subtotal (d)(d)239,699.52$ (e) (f) Site Restoration Civil Construction Permit Maintenance Bond 178,455.29$ Bond Reduction 2 Construction Permit Bond Amount 3 Minimum Bond Amount is $10,000.00 1 Estimate Only - May involve multiple and variable components, which will be established on an individual basis by Development Engineering. 2 The City of Renton allows one request only for bond reduction prior to the maintenance period. Reduction of not more than 70% of the original bond amount, provided that the remaining 30% will cover all remaining items to be constructed. 3 Required Bond Amounts are subject to review and modification by Development Engineering. * Note: The word BOND as used in this document means any financial guarantee acceptable to the City of Renton. ** Note: All prices include labor, equipment, materials, overhead and profit. (425) 285-2390 matt@cphconsultants.com Meadowvue 17-000106 13833 156th Ave SE, Renton WA, 98059 1463400060 FOR APPROVAL C17-002646 11431 Willows Rd NE, Suite 120, Redmond, WA 632,275.90$ P (a) x 100% SITE IMPROVEMENT BOND QUANTITY WORKSHEET BOND CALCULATIONS 11/6/2017 Matt Hough 36495 CPH Consultants R ((b x 150%) + (d x 100%)) S (e) x 150% + (f) x 100% Bond Reduction: Existing Right-of-Way Improvements (Quantity Remaining)2 Bond Reduction: Stormwater & Drainage Facilities (Quantity Remaining)2 T (P +R - S) Prepared by:Project Information CONSTRUCTION BOND AMOUNT */** (prior to permit issuance) EST1 ((b) + (c) + (d)) x 20% -$ MAINTENANCE BOND */** (after final acceptance of construction) 49,901.50$ 228,449.93$ 582,374.40$ 49,901.50$ -$ 239,699.52$ -$ Page 13 of 13 Ref 8-H Bond Quantity Worksheet SECTION III. BOND WORKSHEET Unit Prices Updated: 06/14/2016 Version: 04/26/2017 Printed 11/6/2017