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HomeMy WebLinkAboutRS_Drainage_Report_241002_v1.pdf. Solera Phase 2: Block C & D Site Plan Review Preliminary Technical Information Report September 2024 Solera Phase 2: Block C and Block D – New Home Co. i Drainage Report September 202 4 Prepared for: New Home Co. 1700 NW Gilman Blvd, Suite 220 Issaquah, WA 98027 Prepared by: PIC: Jeremy Febus, PE, LEED AP PM: Michelle Freeman, PE Project Engineer: Monica Regan, PE Design Engineer: Danial Khan, EIT KPFF Consulting Engineers 1601 Fifth Avenue, Suite 1600 Seattle, WA 98101 (206) 622-5822 KPFF Project No. 2400283 09/24/2024 KPFF Consulting Engineers ii This page intentionally left blank. Solera Phase 2: Block C and Block D – New Home Co. iii Table of Contents 1. Project Overview ........................................................................................................................................... 1 2. Existing Conditions and Drainage .............................................................................................................. 1 3. Proposed Conditions and Requirements Summary ................................................................................. 2 Core Requirement No. 1: Discharge at the Natural Location ........................................................................ 3 Core Requirement No. 2: Offsite Analysis ..................................................................................................... 3 Core Requirement No. 3: Flow Control .......................................................................................................... 3 Core Requirement No. 4: Conveyance System ............................................................................................. 3 Core Requirement No. 5: Construction Stormwater Pollution prevention ..................................................... 3 Core Requirement No. 6: Maintenance and Operations ............................................................................... 3 Core Requirement No. 7: Financial Guarantees and Liability ....................................................................... 3 Core Requirement No. 8: Water Quality ........................................................................................................ 4 Core Requirement No. 9: On-Site BMPs ....................................................................................................... 4 Special Requirement No. 1: Other Adopted Area-Specific Requirements .................................................... 4 Special Requirement No. 2: Flood Hazard Area Delineation ........................................................................ 4 Special Requirement No. 3: Flood Protection Facilities ................................................................................ 4 Special Requirement No. 4: Source Control .................................................................................................. 4 Special Requirement No. 5: Oil Control ......................................................................................................... 4 Special Requirement No. 6: Aquifer Protection Areas ................................................................................... 4 4. Off-Site Analysis ........................................................................................................................................... 4 Upstream Analysis .......................................................................................................................................... 4 Downstream Analysis ..................................................................................................................................... 5 5. Flow Control Analysis and Design .............................................................................................................. 5 6. Water Quality Analysis ................................................................................................................................. 6 Water Quality Requirement............................................................................ Error! Bookmark not defined. BMP Requirement ........................................................................................................................................... 7 7. Conveyance System Analysis and Design................................................................................................. 7 8. ESC Analysis and Design ............................................................................................................................ 7 9. Special Reports and Studies ....................................................................................................................... 7 10. Bond Quantities and Declaration of Covenant .......................................................................................... 7 List of Figures Figure 1-1: Vicinity Map, Courtesy of King County iMap...................................................................................... 1 Figure 2-1: Existing Drainage Basins, Subbasins, and Site Characteristics ....... Error! Bookmark not defined. Figure 2-2: Enlargement of Figure 2-1 (Existing Drainage Basins, Subbasins, and Site Characteristics) .. Error! Bookmark not defined. Figure 2-3: Soils, Soil Map courtesy of USDA Web Soil Survey ......................... Error! Bookmark not defined. Figure 4-1: One Mile Downstream Flow Path ..................................................... Error! Bookmark not defined. Figure 5-1: Predeveloped Areas ......................................................................... Error! Bookmark not defined. Figure 5-2: Developed Areas .............................................................................. Error! Bookmark not defined. KPFF Consulting Engineers iv Figure 6-1: Water Quality Basins ......................................................................................................................... 6 List of Tables Table 5-1: On-Site Area Summary ...................................................................................................................... 5 Table 5-2: MGSFlood Peak Flow Rate with 15-Minute Time Step ...................................................................... 5 Table 6-1: MGSFlood Sub-Basin Water Quality Sizing ....................................... Error! Bookmark not defined. Appendices Appendix A – TIR Worksheet Appendix B – Existing Conditions Map Appendix C – Proposed Conditions Map Appendix D – Peak Flow Control Application Map and MGS Flood Calculations Appendix E – On-Site BMPs: LID Performance Standard and Bioretention Calculations Appendix F – Pipe Conveyance Appendix G – Erosion Control Plan and Details Appendix H – SWPPP Appendix I – Bond Quantity Worksheet Appendix J – Operation and Maintenance Manual Appendix K – Geotechnical Report Appendix L – Infiltration Test Report Solera Phase 2: Block C and Block D – New Home Co. 1 1. Project Overview This report has been prepared in support of the Site Plan Entitlement for Blocks C and D of the Solera Short Plat (see Figure 1-1). At the time of this report writing, the City is reviewing the final plat map for the Solera Short Plat. On the final plat, these blocks are referred to as “Parcel 3” and “4”. This scope of work includes construction of townhomes on Block C and Block D, driveway access, grading, utilities, and stormwater mitigation facilities. All off-site work was completed under separate permit, and this proposal is limited to work entirely within the subject parcels. The project is subject to full drainage review according to the requirements of the 2017 Renton Surface Water Design Manual (RSWDM) to which this project is vested by the approved preliminary plat. Figure 1-1: Site Map 2. Existing Conditions and Drainage Block C and Block D have been rough graded under separate permit. Block C is approximately 2.58-acres and is currently a grass field. Parcel D is approximately 1.28-acres and is currently in use as a temporary parking lot for construction of the adjacent Block A and B apartment buildings. Plans call for Block D to also be planted with grass once apartment construction is complete. Both Block C and D generally slope from northeast to southwest at slopes of 2 to 5%. Surface water runoff from Block C leaves the site as sheet flow and is collected by a series of municipal pipes and catch basins in Jefferson Ave NE and NE 10th Street. Surface water runoff from Block D similarly exits the site as sheet flow, KPFF Consulting Engineers 2 but is collected by a series of municipal pipes and catch basins in Harrington Ave NE and NE 11th Street. The two flow paths do not combine until approximately ½-mile downstream. Therefore Blocks C and D are two separate threshold discharge areas (TDAs). The flow paths converge in NE Sunset Blvd and ultimately outfall to Lake Washington approximately 1.3 miles downstream from the site. Figure 2-1: TDA Map According to Geotechnical Engineering Study prepared by Earth Solutions NW, LCC (ESNW), dated September 28, 2020, soil largely consisting of fill deposits underlain by medium dense to dense sand and silty sand native soils (Appendix K). Therefore, we model pervious surfaces on the site as Type C soils in the predeveloped and developed conditions. 3. Proposed Conditions and Requirements Summary The project proposes 61 townhome units on Block C and 29 on Block D along with associated alleys, landscape areas, open space, and requisite utilities. The development must comply with all nine core requirements and six special requirements of the RSWDM. Solera Phase 2: Block C and Block D – New Home Co. 3 CORE REQUIREMENT NO. 1: DISCHARGE AT T HE N ATURAL L OCATION The development will utilize the pre-existing topography and drainage patterns of the site as described above in Section 2 of this report. The proposed development will utilize the storm drainage stubs approved for this purpose by the Solera Preliminary Plat and Civil Construction Permit. CORE REQUIREMENT NO. 2 : O FFSITE A NALYSIS An off-site analysis was completed as part of the approved Solera Preliminary Plat. CORE REQUIREMENT NO. 3: FLOW C ONTROL According to the Flow Control Application Map from the RSWM, the project is required to meet the Peak Rate Flow Control Standard. Flows from the redevelopment must match the 2-year, 10-year and 100-year peak flows from the pre-developed condition. Pre-developed conditions must be modeled as existing conditions. Existing site conditions are defined as conditions that existed prior to May 1979 as determined from aerial photographs, unless land cover changes have been approved by the county since May 1979 as part of a development permit or approval. Existing improvements on the site were built in phases over a range of years from 1958 to 1977, and so for the purposes of this analysis, “existing conditions” are defined as the current land use. The project is exempt from the flow control requirement because it proposes less impervious surface than the existing site conditions. See section 5 of this report for more information on how the project meets flow control requirements. CORE REQUIREMENT NO. 4: CONVEYANCE S YSTEM The development is required to convey the 25-year, 24-hour peak flow without overtopping. Pipe system structures may overtop for runoff events exceeding the 25-year design capacity, provided overflow runoff from a 100-year event does not create or aggravate a severe erosion or flooding problem downstream. The proposed conveyance system has been designed to convey the 25-year peak flow without overtopping. Refer to Section 7 for additional information. CORE REQUIREMENT NO. 5: CONSTRUCTION STORMWATER P OLLUTION PREVENTION Sediment-laden runoff is prohibited from entering adjacent right-of-way and downstream conveyance systems. Temporary Erosion and Sediment Control (TESC) best management practices (BMPs) will be implemented during construction. TESC BMPs are anticipated to include silt fences, conveyance channels, check dams, sediment ponds, and catch basin inserts. Refer to Section 8 for additional information. CORE REQUIREMENT NO. 6: M AIN TENANCE AND O PERATIONS The owner has maintenance responsibilities for on-site facilities. Refer to Section 10 for additional information. CORE REQUIREMENT NO. 7: F INANCIAL G UARANTEES AND L IABILITY Bond quantities for site improvements are provided in Section 10. KPFF Consulting Engineers 4 CORE REQUIREMENT NO. 8: WATER QUALITY Runoff from all pollution-generating surfaces within the development area must be treated for water quality prior to discharge from the site. More than 50% of runoff draining to proposed water quality facilities is from multifamily land uses, so this development is subject to Enhanced Basic Water Quality treatment, per the RSWDM. Enhanced Basic Water Quality treatment requires 80 percent total suspended solids (TSS), more than 30 percent dissolved copper removal, and more than 60 percent dissolved zinc rem oval. The project proposes bioretention facilities to satisfy the requirement. Water quality measures are further described in Section 6 of this report. CORE REQUIREMENT NO. 9: ON-S ITE BMP S The project is required to meet the On-Site BMP requirements by targeting new impervious surfaces, new pervious surfaces, and any replaced impervious surfaces. The City of Renton does not require including existing impervious surfaces added on or after January 8, 2001 as target impervious surfaces. The project will implement the use of bioretention planters to the maximum extent feasible to meet the On-Site BMP requirements. BMP measures are further detailed in Section 6 of this report. S PECIAL R EQUIREMENT NO. 1: OTHER ADOPTED AREA -SPECIFIC R EQUIREMENTS There are no adopted area-specific requirements. S PECIAL R EQUIREMENT NO. 2: FLOOD HAZARD AREA D ELINEATION This project is not located in a flood hazard area. S PECIAL R EQUIREMENT NO. 3: FLOOD PROTECTION F ACILITIES This project does not modify or use a flood protection facility. S PECIAL R EQUIREMENT NO. 4: SOURCE C ONTROL There are no proposed commercial uses for Block C and Block D. S PECIAL R EQUIREMENT NO. 5: O IL C ONTROL The project does not classify as a high use site and is thus exempt from the Special Requirement #5. S PECIAL R EQUIREMENT NO. 6: A QUIFER P ROTECTION A REAS Under current revised delineations of aquifer protection areas within the city, the project site is not located within any aquifer protection area or wellhead protection zone. 4. Off-Site Analysis U PSTREAM A NALYSIS The site is located on a ridgeline; therefore, no upstream basins drain onto the project site. Solera Phase 2: Block C and Block D – New Home Co. 5 DOWNSTREAM A NALYSIS A downstream analysis was completed for the approved preliminary plat, and is not duplicated here. 5. Flow Control Analysis and Design The project proposes less than a 0.15-cfs increase in the 100-year peak flow when compared to existing conditions and is therefore exempt from the Peak Rate Flow Control Standard per RSW DM Section 1.2.3.1.A - Exemptions. Refer to Table 5-1 and Table 5-2 for on-site area and peak flow information. Pre-developed conditions must be modeled as existing conditions. The King County Assessor ’s Reports indicate that the latest improvements to the developed parcels were made prior to 1977. All rooftops, paving, and gravel areas were considered 100 percent impervious, and all pervious areas were considered till grass. An Existing Conditions Map can be found in Appendix B. MGSFlood output data for flow control exception is included in Appendix D. Table 5-1: On-Site Area Summary Impervious (Acres) Pervious (Acres) Total (Acres) Block C Existing Conditions 1.31 1.27 2.58 Proposed Conditions 2.01 0.57 2.58 Block D Existing Conditions 1.28 0 1.28 Proposed Conditions 0.78 0.5 1.28 Total Existing Conditions 2.59 1.27 3.86 Proposed Conditions 2.70 1.16 3.86 Table 5-2: MGSFlood Peak Flow Rate with 15-Minute Time Step Predeveloped Peak Flows (cfs) Unmitigated Developed Peak Flows (cfs) 2-Year Peak Flow 1.063 1.102 10-Year Peak Flow 1.559 1.625 100-Year Peak Flow 2.796 2.915 KPFF Consulting Engineers 6 6. Water Quality Analysis and Design Stormwater runoff is treated through bioretention facilities to meet Basic Enhanced Water Quality treatment requirements. A preliminary Surface Runoff Basin Map can be found in Appendix M. Stormwater runoff from all pervious and impervious surfaces are conveyed to bioretention facilities. Construction of Block C and Block D have been subdivided into 15 basins from the original master plan. Refer to Figure 6-1: Water Quality Basins. The water quality design flow, when detention facilities are not required, must meet 91 percent of the total runoff volume using a 15-minute time step per Section 6.2.1 of the RSWM. The geotechnical report by Earth Solutions Northwest LLC provides tested on-site infiltration rates ranging from 2-20 inches per hour, refer to Appendix L. Runoff treated in bioretention planters will infiltrate into native soils or overflow to the previously described downstream flow path. Design infiltration rates were determined per Section 5.2.1 of the RSWM. An infiltration rate of 6 inches per hour was used for the amended soil and an infiltration rate of 0.7 inches per hour was used for the underlying native soils. The rate of 0.7 inches per hour is a conservative infiltration design rate, taking the lowest tested rate (2 inches per hour) and applying a safety factor of 3. A design spreadsheet summarizing contributing area, bioretention design, and all MGSFlood modeling output data will be provided in Appendix D with construction documents. Figure 6-1: Water Quality Basins Solera Phase 2: Block C and Block D – New Home Co. 7 7. On-site BMPs According to section 1.2.9 of the RWSM, Core Requirement #9 can be satisfied by, 1) Application of BMPs to the maximum extent feasible; or, 2) Using a continuous runoff model to demonstrate compliance with the Low Impact Development (LID) Performance Standard. This development has opted to apply BMPs to the maximum extent feasible across the site. The development has proposed to meet this requirement primarily through bioretention cells distributed throughout the site. Presettling is provided in basins with bioretention facilities taking greater than 5,000 sf of impervious area. For Block C, the site provides at-grade bioretention planters for road runoff and roof areas. The maximum bioretention area site constraints allow is provided. Soil Amendment is proposed to meet BMP requirements for new pervious surfaces on Block C in accordance with The City of Renton Surface Water Design Manual Appendix C.2.13. For Block D, the site provides at-grade bioretention planters for road runoff and roof areas. The maximum bioretention area site constraints allow is provided. For new pervious surface on Block D, Soil Amendment is proposed to meet BMP requirements in accordance with The City of Renton Surface Water Design Manual Appendix C.2.13. Overflow from bioretention areas will be routed via on-site conveyance structures and drain lines to the existing public conveyance system. Basin delineation matches the water quality mapping shown in figure 6-1. and individual basin’s MGSFlood Reports will be provided in the engineering permit submittal. 8. Conveyance System Analysis and Design Storm pipe conveyance and analysis will be provided with construction documents. 9. ESC Analysis and Design A construction stormwater pollution prevention plan will be provided with construction documents. 10. Special Reports and Studies A geotechnical engineering report was prepared by Earth Solutions NW, LLC, dated September 2020. This is included in Appendix K of this report. 11. Bond Quantities and Declaration of Covenant Bond quantity worksheets and a Declaration of Covenant for Operation and Maintenance will be provided with construction documents. KPFF Consulting Engineers 8 This page intentionally left blank. Solera Phase 2: Block C and Block D – New Home Co. Appendix A Appendix A TIR Worksheet CITY OF RENTON SURFACE WATER DESIGN MANUAL 2017 City of Renton Surface Water Design Manual 12/12/2016 8-A-1 REFERENCE 8-A TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 1 PROJECT OWNER AND PROJECT ENGINEER Part 2 PROJECT LOCATION AND DESCRIPTION Project Owner _____________________________ Phone ___________________________________ Address __________________________________ _________________________________________ Project Engineer ___________________________ Company _________________________________ Phone ___________________________________ Project Name __________________________ CED Permit # ________________________ Location Township ________________ Range __________________ Section _________________ Site Address __________________________ _____________________________________ Part 3 TYPE OF PERMIT APPLICATION Part 4 OTHER REVIEWS AND PERMITS  Land Use (e.g., Subdivision / Short Subd.)  Building (e.g., M/F / Commercial / SFR)  Grading  Right-of-Way Use  Other _______________________  DFW HPA  COE 404  DOE Dam Safety  FEMA Floodplain  COE Wetlands  Other ________  Shoreline Management  Structural Rockery/Vault/_____  ESA Section 7 Part 5 PLAN AND REPORT INFORMATION Technical Information Report Site Improvement Plan (Engr. Plans) Type of Drainage Review (check one): Date (include revision dates): Date of Final:  Full  Targeted  Simplified  Large Project  Directed __________________ __________________ __________________ Plan Type (check one): Date (include revision dates): Date of Final:  Full  Modified  Simplified __________________ __________________ __________________ Jaden Storedahl (503) 899-8170 1700 NW Gilman Blvd, Suite 220 Issaquah, WA 98027 Michelle Freeman KPFF (206) 622-5822 Solera Blocks C & D 23 North 05 East 9 2842 NE Sunset Boulevard, Renton, WA 98056 X X X X X X 09/24/2024 REFERENCE 8: PLAN REVIEW FORMS AND WORKSHEET TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 12/12/2016 2017 City of Renton Surface Water Design Manual 8-A-2 Part 6 SWDM ADJUSTMENT APPROVALS Type (circle one): Standard / Blanket Description: (include conditions in TIR Section 2) ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ Approved Adjustment No. ______________________ Date of Approval: _______________________ Part 7 MONITORING REQUIREMENTS Monitoring Required: Yes / No Start Date: _______________________ Completion Date: _______________________ Describe: _________________________________ _________________________________________ _________________________________________ Re: SWDM Adjustment No. ________________ Part 8 SITE COMMUNITY AND DRAINAGE BASIN Community Plan: ____________________________________________________________________ Special District Overlays: ______________________________________________________________ Drainage Basin: _____________________________________________________________________ Stormwater Requirements: _____________________________________________________________ Part 9 ONSITE AND ADJACENT SENSITIVE AREAS  River/Stream ________________________  Lake ______________________________  Wetlands ____________________________  Closed Depression ____________________  Floodplain ___________________________  Other _______________________________ _______________________________  Steep Slope __________________________  Erosion Hazard _______________________  Landslide Hazard ______________________  Coal Mine Hazard ______________________  Seismic Hazard _______________________  Habitat Protection ______________________  _____________________________________ Core Requirements 1-9 and Special Requirements 1-6 Sunset Area Surface Water Master Plan (CH2M HILL, 2011) none proposed East Lake Washington REFERENCE 8-A: TECHNICAL INFORMATION REPORT (TIR) WORKSHEET TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 2017 City of Renton Surface Water Design Manual 12/12/2016 Ref 8-A-3 Part 10 SOILS Soil Type ______________________ ______________________ ______________________ ______________________ Slopes ________________________ ________________________ ________________________ ________________________ Erosion Potential _________________________ _________________________ _________________________ _________________________  High Groundwater Table (within 5 feet)  Other ________________________________  Sole Source Aquifer  Seeps/Springs  Additional Sheets Attached Part 11 DRAINAGE DESIGN LIMITATIONS REFERENCE  Core 2 – Offsite Analysis_________________  Sensitive/Critical Areas__________________  SEPA________________________________  LID Infeasibility________________________  Other________________________________  _____________________________________ LIMITATION / SITE CONSTRAINT _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________  Additional Sheets Attached Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet per Threshold Discharge Area) Threshold Discharge Area: (name or description) Core Requirements (all 8 apply): Discharge at Natural Location Number of Natural Discharge Locations: Offsite Analysis Level: 1 / 2 / 3 dated:__________________ Flow Control (include facility summary sheet) Standard: _______________________________ or Exemption Number: ____________ On-site BMPs: _______________________________ Conveyance System Spill containment located at: _____________________________ Erosion and Sediment Control / Construction Stormwater Pollution Prevention CSWPP/CESCL/ESC Site Supervisor: _____________________ Contact Phone: _________________________ After Hours Phone: _________________________ Type C Till 2-5%Low Block C and Block D 2 03/12/2021 TBD Bioretention TBD REFERENCE 8: PLAN REVIEW FORMS AND WORKSHEET TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 12/12/2016 2017 City of Renton Surface Water Design Manual 8-A-4 Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet per Threshold Discharge Area) Maintenance and Operation Responsibility (circle one): Private / Public If Private, Maintenance Log Required: Yes / No Financial Guarantees and Liability Provided: Yes / No Water Quality (include facility summary sheet) Type (circle one): Basic / Sens. Lake / Enhanced Basic / Bog or Exemption No. _______________________ Special Requirements (as applicable): Area Specific Drainage Requirements Type: SDO / MDP / BP / Shared Fac. / None Name: ________________________ Floodplain/Floodway Delineation Type (circle one): Major / Minor / Exemption / None 100-year Base Flood Elevation (or range): _______________ Datum: Flood Protection Facilities Describe: Source Control (commercial / industrial land use) Describe land use: Describe any structural controls: Oil Control High-Use Site: Yes / No Treatment BMP: _________________________________ Maintenance Agreement: Yes / No with whom? _____________________________________ Other Drainage Structures Describe: Mixed none None Residential TBD During Building Permit Application None REFERENCE 8-A: TECHNICAL INFORMATION REPORT (TIR) WORKSHEET TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 2017 City of Renton Surface Water Design Manual 12/12/2016 Ref 8-A-5 Part 13 EROSION AND SEDIMENT CONTROL REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION  Clearing Limits  Cover Measures  Perimeter Protection  Traffic Area Stabilization  Sediment Retention  Surface Water Collection  Dewatering Control  Dust Control  Flow Control  Control Pollutants  Protect Existing and Proposed BMPs/Facilities  Maintain Protective BMPs / Manage Project MINIMUM ESC REQUIREMENTS AFTER CONSTRUCTION  Stabilize exposed surfaces  Remove and restore Temporary ESC Facilities  Clean and remove all silt and debris, ensure operation of Permanent BMPs/Facilities, restore operation of BMPs/Facilities as necessary  Flag limits of sensitive areas and open space preservation areas  Other _______________________ Part 14 STORMWATER FACILITY DESCRIPTIONS (Note: Include Facility Summary and Sketch) Flow Control Type/Description Water Quality Type/Description  Detention  Infiltration  Regional Facility  Shared Facility  On-site BMPs  Other ________________ ________________ ________________ ________________ ________________ ________________  Vegetated Flowpath  Wetpool  Filtration  Oil Control  Spill Control  On-site BMPs  Other ________________ ________________ ________________ ________________ ________________ ________________ ________________ Part 15 EASEMENTS/TRACTS Part 16 STRUCTURAL ANALYSIS  Drainage Easement  Covenant  Native Growth Protection Covenant  Tract  Other ____________________________  Cast in Place Vault  Retaining Wall  Rockery > 4′ High  Structural on Steep Slope  Other _______________________________ X X X X X X X X X X X X Infiltration Chambers Bioretention Swales Bioretention X Infiltration Chambers X X X X X X X X REFERENCE 8: PLAN REVIEW FORMS AND WORKSHEET TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 12/12/2016 2017 City of Renton Surface Water Design Manual 8-A-6 Part 17 SIGNATURE OF PROFESSIONAL ENGINEER I, or a civil engineer under my supervision, have visited the site. Actual site conditions as observed were incorporated into this worksheet and the attached Technical Information Report. To the best of my knowledge the information provided here is accurate. ____________________________________________________________________________________ Signed/Date Solera Phase 2: Block C and Block D – New Home Co. Appendix B Appendix B Existing Conditions Map NE 1 2 TH S T R E E T (A D ED I CA T ED PUB L I C R IGH T O F WA Y ) HARRINGTON PLACE NE (A DEDICATED PUBLIC RIGHT OF W A Y )KIRKLAND AVENUE NE(A DEDICATED PUBLIC RIGHT OF WAY)NE SUNSET BOULEVARD (A DEDICATED PUBLIC RIGHT OF WAY) SUNSET LANE NE (A DEDICATED PUBLIC RIGHT OF WAY)NE 10TH STREET(A DEDICATED PUBLIC RIGHT OF WAY)SUNSET LANE NE (A DEDICATED PUBLIC RIGHT OF WAY) NE SUNSET BOULEVARD (A DEDICATED PUBLIC RIGHT OF WAY) PERVIOUS: 1.78 ACRES IMPERVIOUS = 11.04 ACRES B A DC SOLERA EXISTING CONDITIONS JEFFERSON AVENUE NE NE SUNSET BOULEVARD (SR 900)NE 10TH STREETNE 11TH STREETNE 12THSTREETHARRINGTON PLACE N E KIRKLANDAVENUE NE Solera Phase 2: Block C and Block D – New Home Co. Appendix C Appendix C Proposed Conditions Map HARRINGTON PL NE HAR RI N GT O N A V E N E NE 10TH STNE 1 2TH STKIRKLAND AVE NENE 11TH STJEFFERSON AVE NE JEFFERSON AVE NE3433443453503443463473483493513523 5 23533 4 9 346347355353354356357357357351352353 345350355341342343 3 4 4 346347348349351352353354354354 3563 5 4 ALLEY AALLEY BALLEY DALLEY EALLEY FALLEY GALLEY C BLOCK B BLOCK A BLOCK C BLOCK D LEGEND: PROPERTY LINE ROW LINE ROW CENTERLINE PROPOSED MAJOR CONTOUR PROPOSED MINOR CONTOUR STORM MAIN CATCH BASIN 360 362 20,570.32 sf 10,775.8 sf 3,027.62 sf 2,304.16 sf 3,661.44 sf 4,306.25 sf 4,307.06 sf 4,307.53 sf 3,026.82 sf 3,025.9 sf 3,022.25 sf 3,025.89 sf 3,663.64 sf 3,670.53 sf 3,661.15 sf 3,025.15 sf 3,665.21 sf 3,663.75 sf 2,306.08 sf 3,023.06 sf 3,020.17 sf3,022.01 sf JEFFERSON AVENUE NE NE 10TH STREETNE 11TH STREETNE 12TH STREET HARRINGTON PLACE N E KIRKLANDAVENUE NESURFACE ROOF TOP SIDEWALK ROAD/DRIVEWAY BIORETENTION PLANTER LANDSCAPE/GRAVEL TOTAL SOLERA PROPOSED CONDITIONS BLOCK A 1.94 AC 0.27 AC 0.03 AC 0.03 AC 0.33 AC 2.60 AC BLOCK ABLOCK B BLOCK C BLOCK B 2.04 AC 0.22 AC 0.19 AC 0 0.31 AC 2.76 AC TOTAL 5.51 AC 1.89 AC 2.91 AC 0.25 AC 2.26 AC 12.82 AC NE SUNSET BOULEVARD (SR 900) BLOCK D 0 1 inch = 40 feet 20'40'80' BLOCK C 1.10 AC 0.37 AC 0.47 AC 0.06 AC 0.57 AC 2.57 AC BLOCK D 0.43 AC 0.07 AC 0.25 AC 0.03 AC 0.50 AC 1.28 AC OFF-SITE 0 0.96 AC 1.97 AC 0.13 AC 0.55 AC 3.61 AC PHASE 1 (CONSTRUCTED)PHASE 2 (PROPOSED) Solera Phase 2: Block C and Block D – New Home Co. Appendix D Appendix D Peak Flow Control Application Map and MGSFlood Calc ulations LakeDesire ShadyLake (MudLake) PantherLake LakeYoungs LakeWashington Bl a c kRi ver Gr eenRiv e r C edarRi verUV900 UV167 UV515 UV169 UV900 UV169 UV167BN IncBN IncBBNNIInnccSSEERReennttoonn II ssss aa qquuaahh RR dd RReennttoonnMMaappllee VVaalllleeyyRRdd MMaapplleeVVaalllleeyyHHwwyy 110088tthhAAvveeSSEESSWW SSuunnsseettBBllvvdd RRaaiinnii eerrAAvveeNNNE 3rd StNE 3rd St SW 43rd StSW 43rd St SS EE CCaarrrrRR dd NE 4th StNE 4th St SSEE RReennttoonn MMaappllee VVaalllleeyy RRddLLooggaannAAvveeNN SR 515SR 515PPaarrkkAAvveeNNOOaakkeessddaalleeAAvveeSSWWSSuunnsseettBBllvvddNN EE DDuuvvaallllAAvveeNNEEI-405 FWYI-405 FWY II--440055FFWWYYSR 167SR 167114400tthh WWaayySS EENNEE 2277tthh SStt 115566tthhAAvveeSSEEUUnniioonnAAvveeNNEE111166tthhAAvveeSSEESW 7th StSW 7th St N 8th StN 8th St PP uuggeettDDrrSSEE RR ee nnttoonnAAvvee SS SSWW 2277tthh SStt BBeennssoonnRRddSSWWiilllliiaammssAAvveeSSMMoonnrrooeeAAvveeNNEESE 128th StSE 128th St II nntt eerr uurr bbaannAAvveeSS HHooqquuiiaammAAvveeNNEE8844tthhAAvveeSSSSEEPPeett rr oovvii tt sskkyyRRddEEVVaalllleeyyHHwwyySE 192nd StSE 192nd St SE 60th StSE 60th St TTaallbboottRRddSSRRee nn tt oo nn AAvveeSS116644tthhAAvveeSSEESE 208th StSE 208th St SE 72nd StSE 72nd St RRaaiinniieerr AAvvee SS 111166tthhAAvveeSSEES 128th StS 128th St NNeewwccaassttllee WWaayy SS 221122tthh SStt SS 118800tthh SStt CCooaall CCrreeeekkPPkkwwyySSEESW 41st StSW 41st St 114400tthhAAvveeSSEE112288tthhAAvveeSSEE6688tthhAAvveeSSSSEE 116688tthh SStt NE 12th StNE 12th St BBee aa ccoonn AA vv ee SS FFoorreesstt DDrr SSEE SSEE 116644tthh SStt 114488tthhAAvveeSSEESSEE MMaayy VVaalllleeyy RRdd SS EE JJ oo nn ee ss RR dd SSEE 22 00 44 tthh WW aayySW 34th StSW 34th St SE 144th StSE 144th St 114488tthhAAvveeSSEE115544tthhPPllSSEELL aa kk ee WWaa sshhii nnggtt oonnBBll vvddNNEEddmmoonnddssAAvveeNNEEAAbbeerrddeeeennAAvveeNNEEEEMM eerrcceerrWWaayyWWeessttVVaalllleeyyHHwwyyEast Valley RdEast Valley Rd,§-405 ,§-405 ,§-405 µ0 1 2Miles Flow Control Application Map Reference 15-A Date: 01/09/2014 Flow Control Standards Peak Rate Flow Control Standard (Existing Site Conditions) Flow Control Duration Standard (Existing Site Conditions) Flow Control Duration Standard (Forested Conditions) Flood Problem Flow Unincorporated King County Flow Control Standards Renton City Limits Potential Annexation Area PROJECT SITE ————————————————————————————————— MGS FLOOD PROJECT REPORT Program Version: MGSFlood 4.63 Program License Number: 200410007 Project Simulation Performed on: 09/24/2024 3:40 PM Report Generation Date: 09/24/2024 3:40 PM ————————————————————————————————— Input File Name: Solera Phase 2 Flow Control.fld Project Name: Entire Site Solera Townhomes (Phase 2) Analysis Title: Flow Control Analysis Comments: ———————————————— PRECIPITATION INPUT ———————————————— Computational Time Step (Minutes): 15 Extended Precipitation Time Series Selected Full Period of Record Available used for Routing Climatic Region Number: 3 Precipitation Station : 95004005 Puget West 40 in_5min 10/01/1939-10/01/2097 Evaporation Station : 951040 Puget West 40 in MAP Evaporation Scale Factor : 0.750 HSPF Parameter Region Number: 1 HSPF Parameter Region Name : Ecology Default ********** Default HSPF Parameters Used (Not Modified by User) *************** ********************** WATERSHED DEFINITION *********************** Predevelopment/Post Development Tributary Area Summary Predeveloped Post Developed Total Subbasin Area (acres) 3.860 3.860 Area of Links that Include Precip/Evap (acres) 0.000 0.000 Total (acres) 3.860 3.860 ----------------------SCENARIO: PREDEVELOPED Number of Subbasins: 1 ---------- Subbasin : Subbasin 1 ---------- -------Area (Acres) -------- A/B, Lawn, Flat 1.270 PARKING/FLAT 2.590 BLOCKS C AND D FLOW CONTROL MODELING REPORT ---------------------------------------------- Subbasin Total 3.860 ----------------------SCENARIO: POSTDEVELOPED Number of Subbasins: 2 ---------- Subbasin : Block C ---------- -------Area (Acres) -------- A/B, Lawn, Flat 0.630 ROADS/FLAT 0.480 ROOF TOPS/FLAT 1.100 SIDEWALKS/FLAT 0.370 ---------------------------------------------- Subbasin Total 2.580 ---------- Subbasin : Block D ---------- -------Area (Acres) -------- A/B, Lawn, Flat 0.530 ROADS/FLAT 0.250 ROOF TOPS/FLAT 0.430 SIDEWALKS/FLAT 0.070 ---------------------------------------------- Subbasin Total 1.280 ************************* LINK DATA ******************************* ----------------------SCENARIO: PREDEVELOPED Number of Links: 0 ************************* LINK DATA ******************************* ----------------------SCENARIO: POSTDEVELOPED Number of Links: 1 ------------------------------------------ Link Name: New Copy Lnk1 Link Type: Copy Downstream Link: None **********************FLOOD FREQUENCY AND DURATION STATISTICS******************* ----------------------SCENARIO: PREDEVELOPED Number of Subbasins: 1 Number of Links: 0 ----------------------SCENARIO: POSTDEVELOPED Number of Subbasins: 2 Number of Links: 1 BLOCKS C AND D FLOW CONTROL MODELING REPORT ***********Groundwater Recharge Summary ************* Recharge is computed as input to Perlnd Groundwater Plus Infiltration in Structures Total Predeveloped Recharge During Simulation Model Element Recharge Amount (ac-ft) ----------------------------------------------------------------------------------------------- Subbasin: Subbasin 1 427.906 _____________________________________ Total: 427.906 Total Post Developed Recharge During Simulation Model Element Recharge Amount (ac-ft) ----------------------------------------------------------------------------------------------- Subbasin: Block C 212.268 Subbasin: Block D 178.575 Link: New Copy Lnk1 0.000 _____________________________________ Total: 390.843 Total Predevelopment Recharge is Greater than Post Developed Average Recharge Per Year, (Number of Years= 158) Predeveloped: 2.708 ac-ft/year, Post Developed: 2.474 ac-ft/year ***********Water Quality Facility Data ************* ----------------------SCENARIO: PREDEVELOPED Number of Links: 0 ----------------------SCENARIO: POSTDEVELOPED Number of Links: 1 ********** Link: New Copy Lnk1 ********** 2-Year Discharge Rate : 1.102 cfs 15-Minute Timestep, Water Quality Treatment Design Discharge On-line Design Discharge Rate (91% Exceedance): 0.43 cfs Off-line Design Discharge Rate (91% Exceedance): 0.25 cfs Infiltration/Filtration Statistics-------------------- Inflow Volume (ac-ft): 1219.58 Inflow Volume Including PPT-Evap (ac-ft): 1219.58 Total Runoff Infiltrated (ac-ft): 0.00, 0.00% Total Runoff Filtered (ac-ft): 0.00, 0.00% Primary Outflow To Downstream System (ac-ft): 1219.58 Secondary Outflow To Downstream System (ac-ft): 0.00 Volume Lost to ET (ac-ft): 0.00 Percent Treated (Infiltrated+Filtered+ET)/Total Volume: 0.00% BLOCKS C AND D FLOW CONTROL MODELING REPORT ***********Compliance Point Results ************* Scenario Predeveloped Compliance Subbasin: Subbasin 1 Scenario Postdeveloped Compliance Link: New Copy Lnk1 *** Point of Compliance Flow Frequency Data *** Recurrence Interval Computed Using Gringorten Plotting Position Predevelopment Runoff Postdevelopment Runoff Tr (Years) Discharge (cfs) Tr (Years) Discharge (cfs) ---------------------------------------------------------------------------------------------------------------------- 2-Year 1.063 2-Year 1.102 5-Year 1.336 5-Year 1.392 10-Year 1.559 10-Year 1.625 25-Year 1.877 25-Year 1.955 50-Year 2.334 50-Year 2.433 100-Year 2.796 100-Year 2.915 200-Year 2.928 200-Year 3.052 500-Year 3.097 500-Year 3.228 ** Record too Short to Compute Peak Discharge for These Recurrence Intervals **** LID Duration Performance **** Excursion at Predeveloped 8%Q2 (Must be Less Than 0%): 4.1% FAIL Maximum Excursion from 8%Q2 to 50%Q2 (Must be Less Than 0%): 16.2% FAIL ------------------------------------------------------------------------------------------------- LID DURATION DESIGN CRITERIA: FAIL ------------------------------------------------------------------------------------------------- BLOCKS C AND D FLOW CONTROL MODELING REPORT ————————————————————————————————— MGS FLOOD PROJECT REPORT Program Version: MGSFlood 4.63 Program License Number: 200410007 Project Simulation Performed on: 09/24/2024 3:35 PM Report Generation Date: 09/24/2024 3:35 PM ————————————————————————————————— Input File Name: Solera Phase 2 Water Quality.fld Project Name: Entire Site Solera Townhomes (Phase 2) Analysis Title: Water Qualityl Analysis Comments: ———————————————— PRECIPITATION INPUT ———————————————— Computational Time Step (Minutes): 15 Extended Precipitation Time Series Selected Full Period of Record Available used for Routing Climatic Region Number: 3 Precipitation Station : 95004005 Puget West 40 in_5min 10/01/1939-10/01/2097 Evaporation Station : 951040 Puget West 40 in MAP Evaporation Scale Factor : 0.750 HSPF Parameter Region Number: 1 HSPF Parameter Region Name : Ecology Default ********** Default HSPF Parameters Used (Not Modified by User) *************** ********************** WATERSHED DEFINITION *********************** Predevelopment/Post Development Tributary Area Summary Predeveloped Post Developed Total Subbasin Area (acres) 0.794 0.730 Area of Links that Include Precip/Evap (acres) 0.000 0.064 Total (acres) 0.794 0.794 ----------------------SCENARIO: PREDEVELOPED Number of Subbasins: 1 ---------- Subbasin : Subbasin 1 ---------- -------Area (Acres) -------- PARKING/FLAT 0.794 ---------------------------------------------- BLOCKS C AND D WATER QUALITY MODELING REPORT Subbasin Total 0.794 ----------------------SCENARIO: POSTDEVELOPED Number of Subbasins: 2 ---------- Subbasin : Block C ---------- -------Area (Acres) -------- ROADS/FLAT 0.480 ---------------------------------------------- Subbasin Total 0.480 ---------- Subbasin : Block D ---------- -------Area (Acres) -------- ROADS/FLAT 0.250 ---------------------------------------------- Subbasin Total 0.250 ************************* LINK DATA ******************************* ----------------------SCENARIO: PREDEVELOPED Number of Links: 0 ************************* LINK DATA ******************************* ----------------------SCENARIO: POSTDEVELOPED Number of Links: 2 ------------------------------------------ Link Name: New Copy Lnk1 Link Type: Copy Downstream Link: None ------------------------------------------ Link Name: On-Site Bioretention Link Type: Ecology Bioretention Facility Downstream Link: None Floor Elevation (ft) : 100.00 Riser Crest Elevation (ft) : 100.50 Storage Depth (ft) : 0.50 Bottom Length (ft) : 100.0 Bottom Width (ft) : 28.0 Bottom Slope (ft/ft) : 0.000 Side Slopes (ft/ft) : Z1= 0.00 Z2= 0.00 Z3= 0.00 Z4= 0.00 Bottom Area (sq-ft) : 2800. Area at Riser Crest El (sq-ft) : 2,800. (acres) : 0.064 Volume at Riser Crest (cu-ft) : 1,400. (ac-ft) : 0.032 BLOCKS C AND D WATER QUALITY MODELING REPORT Infiltration on Bottom and Sideslopes Selected Soil Properties Layer No Soil Name Thickness (ft) 1 ASTM 100 0.010 2 SMMWW 12 in/hr (Ecol 1.500 3 GRAVEL 0.010 KSat Safety Factor: 2.0 Native Soil Infiltration Rate (in/hr) : 0.70 Underdrain Not Present Riser Geometry Riser Structure Type : Circular Riser Diameter (in) : 6.00 Common Length (ft) : 0.000 Riser Crest Elevation : 100.50 ft Hydraulic Structure Geometry Number of Devices: 0 **********************FLOOD FREQUENCY AND DURATION STATISTICS******************* ----------------------SCENARIO: PREDEVELOPED Number of Subbasins: 1 Number of Links: 0 ----------------------SCENARIO: POSTDEVELOPED Number of Subbasins: 2 Number of Links: 2 ********** Link: On-Site Bioretention ********** Link WSEL Stats WSEL Frequency Data(ft) (Recurrence Interval Computed Using Gringorten Plotting Position) Tr (yrs) WSEL Peak (ft) ====================================== 1.05-Year 100.006 1.11-Year 100.007 1.25-Year 100.010 2.00-Year 100.218 3.33-Year 100.489 5-Year 100.559 10-Year 100.612 25-Year 100.640 50-Year 100.666 100-Year 100.675 BLOCKS C AND D WATER QUALITY MODELING REPORT ***********Groundwater Recharge Summary ************* Recharge is computed as input to Perlnd Groundwater Plus Infiltration in Structures Total Predeveloped Recharge During Simulation Model Element Recharge Amount (ac-ft) ----------------------------------------------------------------------------------------------- Subbasin: Subbasin 1 0.000 _____________________________________ Total: 0.000 Total Post Developed Recharge During Simulation Model Element Recharge Amount (ac-ft) ----------------------------------------------------------------------------------------------- Subbasin: Block C 0.000 Subbasin: Block D 0.000 Link: New Copy Lnk1 Not Applicable Link: On-Site Bioretention 322.318 _____________________________________ Total: 322.318 Total Predevelopment Recharge is Less than Post Developed Average Recharge Per Year, (Number of Years= 158) Predeveloped: 0.000 ac-ft/year, Post Developed: 2.040 ac-ft/year ***********Water Quality Facility Data ************* ----------------------SCENARIO: PREDEVELOPED Number of Links: 0 ----------------------SCENARIO: POSTDEVELOPED Number of Links: 2 ********** Link: On-Site Bioretention ********** 2-Year Discharge Rate : 0.000 cfs 15-Minute Timestep, Water Quality Treatment Design Discharge On-line Design Discharge Rate (91% Exceedance): 0.12 cfs Off-line Design Discharge Rate (91% Exceedance): 0.07 cfs Infiltration/Filtration Statistics-------------------- Inflow Volume (ac-ft): 329.40 Inflow Volume Including PPT-Evap (ac-ft): 333.32 Total Runoff Infiltrated (ac-ft): 322.32, 96.70% Total Runoff Filtered (ac-ft): 0.00, 0.00% Primary Outflow To Downstream System (ac-ft): 2.02 Secondary Outflow To Downstream System (ac-ft): 0.00 Volume Lost to ET (ac-ft): 8.98 Percent Treated (Infiltrated+Filtered+ET)/Total Volume: 99.39% BLOCKS C AND D WATER QUALITY MODELING REPORT ***********Compliance Point Results ************* Scenario Predeveloped Compliance Subbasin: Subbasin 1 Scenario Postdeveloped Compliance Link: On-Site Bioretention *** Point of Compliance Flow Frequency Data *** Recurrence Interval Computed Using Gringorten Plotting Position Predevelopment Runoff Postdevelopment Runoff Tr (Years) Discharge (cfs) Tr (Years) Discharge (cfs) ---------------------------------------------------------------------------------------------------------------------- 2-Year 0.322 2-Year 0.000 5-Year 0.408 5-Year 7.518E-02 10-Year 0.467 10-Year 0.185 25-Year 0.570 25-Year 0.246 50-Year 0.715 50-Year 0.292 100-Year 0.857 100-Year 0.306 200-Year 0.897 200-Year 0.313 500-Year 0.949 500-Year 0.322 ** Record too Short to Compute Peak Discharge for These Recurrence Intervals **** LID Duration Performance **** Excursion at Predeveloped 8%Q2 (Must be Less Than 0%): -99.5% PASS Maximum Excursion from 8%Q2 to 50%Q2 (Must be Less Than 0%): -96.9% PASS ------------------------------------------------------------------------------------------------- MEETS ALL LID DURATION DESIGN CRITERIA: PASS ------------------------------------------------------------------------------------------------- BLOCKS C AND D WATER QUALITY MODELING REPORT Solera Phase 2: Block C and Block D – New Home Co. Appendix E Appendix E On-Site BMPs (TO BE PROVIDED WITH CONSTRUCTION DOCUMENTS) Solera Phase 2: Block C and Block D – New Home Co. Appendix F Appendix F Pipe Conveyance (TO BE PROVIDED WITH CONSTRUCTION DOCUMENTS) Solera Phase 2: Block C and Block D – New Home Co. Appendix G Appendix G Erosion Control Plan and Details (TO BE PROVIDED WITH CONSTRUCTION DOCUMENTS) Solera Phase 2: Block C and Block D – New Home Co. Appendix H Appendix H SWPPP (TO BE PROVIDED WITH CONSTRUCTION DOCUMENTS) Solera Phase 2: Block C and Block D – New Home Co. Appendix I Appendix I Bond Quantity Worksheet (TO BE PROVIDED WITH CONSTRUCTION DOCUMENTS) Solera Phase 2: Block C and Block D – New Home Co. Appendix J Appendix J Operation and Maintenance Manual (TO BE PROVIDED WITH CONSTRUCTION DOCUMENTS) Solera Phase 2: Block C and Block D – New Home Co. Appendix K Appendix K Geotechnical Report EarthSolutionsNWLLC EarthSolutions NW LLC Geotechnical Engineering Geology Environmental Scientists Construction Monitoring 1805 -136th Place N.E.,Suite 201 Bellevue,WA 98005 (425)449-4704 Fax (425)449-4711 www.earthsolutionsnw.com GEOTECHNICAL ENGINEERING STUDY RENTON HIGHLANDS TOWNHOMES NORTHEAST SUNSET BOULEVARD RENTON,WASHINGTON ES-5719 Drwn. Checked Date Date Proj.No. Plate Earth Solutions NWLLC Geotechnical Engineering,Construction Monitoring EarthSolutionsNWLLC EarthSolutions NW LLC and Environmental Sciences Vicinity Map Renton Highlands Townhomes Renton,Washington MRS CGH 01/29/2018 Jan.2018 5719 1 NORTH NOTE:This plate may contain areas of color.ESNW cannot be responsible for any subsequent misinterpretation of the information resulting from black &white reproductions of this plate. Reference: King County,Washington Map 626 By The Thomas Guide Rand McNally 32nd Edition SITE Plate Proj.No. Date Checked By Drwn.ByEarthSolutionsNWLLCGeotechnicalEngineering,ConstructionMonitoringandEnvironmentalSciencesEarthSolutionsNWLLCEarthSolutionsNWLLCBoringLocationPlanRentonHighlandsTownhomesRenton,WashingtonMRS CGH 01/29/2018 5719 2 NORTH NOT -TO -SCALE NOTE:This plate may contain areas of color.ESNW cannot be responsible for any subsequent misinterpretation of the information resulting from black &white reproductions of this plate. NOTE:The graphics shown on this plate are not intended for design purposes or precise scale measurements,but only to illustrate the approximate test locations relative to the approximate locations of existing and /or proposed site features.The information illustrated is largely based on data provided by the client at the time of our study.ESNW cannot be responsible for subsequent design changes or interpretation of the data by others. LEGEND Approximate Location of ESNW Boring,Proj.No. ES-5719,Dec.2017 Subject Site Existing Building KIRKLAND AVENUE N.E. N.E. SUNSET BOULEVARDN.E. 12TH STREET HARRINGTON AVENUE N.E.N.E.10T H ST R EETApartments SUNSET LANE N.E.B-1 B-2 B-3 B-4 B-5B-6 B-7 B-8 B-9 B-10 B-11 B-12 B-13 B-1 HARRINGTON PL. N.E. Drwn. Checked Date Date Proj.No. Plate Earth Solutions NWLLC Geotechnical Engineering,Construction Monitoring EarthSolutionsNWLLC EarthSolutions NW LLC and Environmental Sciences CANTILEVER &SINGLE TIEBACK WALL D =Pile Embedment (per Structural Eng.) 2' H (Wall Height) Active Earth Pressure Passive Earth Pressure EFP=350pcf EFP=35pcf Surcharge (W here Applicable) Traffic Surcharge or Building Surcharge (W here Applicable) Excavation Level SCHEMATIC ONLY -NOT TO SCALE NOT A CONSTRUCTION DRAW ING NOTES: Diagram for pressure distribution illustration only,not a design drawing. Passive Pressure includes a factor of safety of 1.5. For adjacent building or traffic surcharge see text. NOTE: See text for recommended Slope Backfill and At-Rest Pressures. Neglect Upper 2 feet of Passive Pressure Renton Highlands Townhomes Renton,Washington MRS CGH 01/29/2018 Jan.2018 5719 3 Drwn. Checked Date Date Proj.No. Plate Earth Solutions NWLLC Geotechnical Engineering,Construction Monitoring EarthSolutionsNWLLC EarthSolutions NW LLC and Environmental Sciences NO LOAD ZONE D =Pile Embedment (per Structural Eng.) H (Wall Height) Traffic Surcharge or Building Surcharge (W here Applicable) Excavation Level SCHEMATIC ONLY -NOT TO SCALE NOT A CONSTRUCTION DRAW ING H/4 60 Tieback No Load Zone Renton Highlands Townhomes Renton,Washington MRS CGH 01/29/2018 Jan.2018 5719 4 Drwn. Checked Date Date Proj.No. Plate Earth Solutions NWLLC Geotechnical Engineering,Construction Monitoring EarthSolutionsNWLLC EarthSolutions NW LLC and Environmental Sciences SHORING WALL DRAINAGE W ood Lagging Native Soil Excavation PVC Tightline Structural Fill Foundation (per Plan) Drain Grate Waterproofing and Insulation per Architectural Plan Continuous Sheet Drain (Placed with Filter Fabric Facing Shoring) Concrete Facing Slab-On-Grade Floor (per Plan) NOTE:Drain through wall should be installed at middle of lagging. SCHEMATIC ONLY -NOT TO SCALE NOT A CONSTRUCTION DRAW ING Renton Highlands Townhomes Renton,Washington MRS CGH 01/29/2018 Jan.2018 5719 5 Drwn. Checked Date Date Proj.No. Plate Earth Solutions NWLLC Geotechnical Engineering,Construction Monitoring and Environmental Sciences EarthSolutionsNWLLC EarthSolutions NW LLC RETAINING WALL DRAINAGE DETAIL NOTES: Free-draining Backfill should consist of soil having less than 5 percent fines. Percent passing No.4 sieve should be 25 to 75 percent. Sheet Drain may be feasible in lieu of Free-draining Backfill,per ESNW recommendations. Drain Pipe should consist of perforated, rigid PVC Pipe surrounded with 1-inch Drain Rock. LEGEND: Free-draining Structural Backfill 1-inch Drain Rock 18"Min. Structural Fill Perforated Rigid Drain Pipe (Surround in Drain Rock) SCHEMATIC ONLY -NOT TO SCALE NOT A CONSTRUCTION DRAWING Renton Highlands Townhomes Renton,Washington MRS CGH 01/29/2018 Jan.2018 5719 6 Drwn. Checked Date Date Proj.No. Plate Earth Solutions NWLLC Geotechnical Engineering,Construction Monitoring and Environmental Sciences EarthSolutionsNWLLC EarthSolutions NW LLC FOOTING DRAIN DETAIL Slope Perforated Rigid Drain Pipe (Surround in Drain Rock) 18"Min. NOTES: Do NOT tie roof downspouts to Footing Drain. Surface Seal to consist of 12"of less permeable,suitable soil.Slope away from building. LEGEND: Surface Seal:native soil or other low-permeability material. 1-inch Drain Rock SCHEMATIC ONLY -NOT TO SCALE NOT A CONSTRUCTION DRAW ING Renton Highlands Townhomes Renton,Washington MRS CGH 01/29/2018 Jan.2018 5719 7 Solera Phase 2: Block C and Block D – New Home Co. Appendix L Appendix L Infiltration Test Report Geotechnical Engineering,Construction Obser vation/Testing and Environmental Services Drwn.CAM Checked CGH Date July 2018 Date 07/10/2018 Proj.No.5719.02 Plate 1 Earth Solutions NWLLCEarthSolutionsNWLLC EarthSolutions NW LLC Vicinity Map Solera Renton,Washington NORTH NOTE:This plate may contain areas of color.ESNW cannot be responsible for any subsequent misinterpretation of the information resulting from black &white reproductions of this plate. Reference: King County,Washington Map 626 By The Thomas Guide Rand McNally 32nd Edition SITE GeotechnicalEngineering,ConstructionObservation/TestingandEnvironmentalServicesPlate Proj.No. Date Checked By Drwn.ByEarthSolutionsNWLLCEarthSolutionsNWLLCEarthSolutionsNWLLCSubsurfaceExplorationPlanSolera Renton,WashingtonCAM CGH 07/10/2018 5719.02 2 NORTH NOT -TO -SCALE NOTE:This plate may contain areas of color.ESNW cannot be responsible for any subsequent misinterpretation of the information resulting from black &white reproductions of this plate. NOTE:The graphics shown on this plate are not intended for design purposes or precise scale measurements,but only to illustrate the approximate test locations relative to the approximate locations of existing and /or proposed site features.The information illustrated is largely based on data provided by the client at the time of our study.ESNW cannot be responsible for subsequent design changes or interpretation of the data by others. LEGEND Approximate Location of ESNW Test Pit,Proj.No. ES-5719.02,June 2018 Approximate Location of ESNW Boring,Proj.No. ES-5719,Dec.2017 Subject Site Existing Building B-1 TP-1 KIRKLAND AVENUE N.E. N.E. SUNSET BOULEVARDN.E. 12TH STREET HARRINGTON AVENUE N.E.N.E.10T H ST R EETApartments SUNSET LANE N.E.B-1 B-2 B-3 B-4 B-5B-6 B-7 B-8 B-9 B-10 B-11 B-12 B-13 HARRINGTON PL. N.E.TP-1 TP-4 TP-2 TP-3