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NO �.f �1���•�� l iiir�'f if� ff� Q �'{� •r car � r- s �f�f .0ttt�t��� ti"' �r r-= i SALVATION ARMY RENTON CORPS EXPANSION PRELIMINARY SURFACE WATER TECHNICAL INFORMATION REPORT July 26, 2012 Prepared for: Schemata Workshop, Inc. 1720 12`" Avenue 43 Seattle, WA 98122 Prepared by: SvR Design Company 1205 Second Avenue, Suite 200 Seattle, WA 98101 SvR Project No. 12025 ► DESIGN COMPANY DESIGN COMPANY SALVATION ARMY RENTON CORPS EXPANSION PRELIMINARY SURFACE WATER TECHNICAL INFORMATION REPORT July 26, 2012 QA/QC REVIEWER 110 DESIGN COMPANY TABLE OF CONTENTS Section Page 1.0# PROJECT OVERVIEW................................................................................................................................1# 1.1# General......................................................................................................................... ........................ I # 1.2# Pre -developed Condition...........................................................................................................................1# 1.3# Proposed Development........................................................................__..--.......--...--.--.----.--....--......--..2# 1.4# Proposed Storm Drainage Facilities...........................................................................................................2# 1.5#Sods.....-..-.----.............................................................................................................................................3 2.0# CONDITIONS AND REQUIREMENTS SUMMARY........ ................ ..................................................... 14# 2.1 # Conditions and Requirements..................................................................................................................14# 2.1.1# Core Requirements...........................................................................................................................14# 2.1.2# Special Requirements.......................................................................................................................15# 3.0# OFF-SITE ANALYSIS................................................................................................................................18# 3.1# Standard Requirements............................................................................................................................18# 4.0# FLOW CONTROL. AND WATER QUALITY FACILITY ANALYSIS AND DESIGN ..........................19# 4.1 # Existing Site Hydrology...........................................................................................................................19# 4.2# Developed Site Hydrology.......................................................................................................................19# 4.34 Performance Standards............................................................................................................................19# 4.3.1# Flow Control Facilities.....................................................................................................................19# 4.3).2# Water Quality Facilities.................................................................................................................. 19# 5.0# CONVEYANCE SYSTEMS ANALYSIS AND DESIGN.........................................................................21# 5.1# Standard Requirements...................•..--...--.--.----.--.....---.......................•..--................................................21# 5,2# Proposed Conveyance System.................................................................................................................21 # 6-0# SPECIAL REPORTS AND STUDIES........................................................................................................22# 6.1 # Geotechnical.........................................................................................................•.......•..--.----.......-----.....22# 7.0# OTHER PERMITS......................................................................................................................................23# 7,1# Other Permits...........................................................................................................................................23# 8.04 CSWPPP ANALYSIS AND DESIGN........................................................................................................24# S.1# ESC Plan..................................................................................................................................................24# 9.0# BOND QUANTITIES, FACILITY SUMMARIES, & DECLARATION OF COVENANT......................25# 9.1# Bond Quantity Plan.................................................................................................................................25# 10.0# Operations and maintenance MANUAL......................................................................................................33# 10-1# Maintenance Recommendations........................................................................................................33# Salvation Army Renton Corps Expansion, SvR No 12025 Page i Preliminary Technical Information Report July 26, 2012 LIST OF FIGURES Figure 1 —'FIR Worksheet Figure 2a — Site Location Figure 2b — Sensitive Areas Map — Aquifer Protection Figure 3 — Existing Conditions - Drainage Subbasins and Site Characteristics Figure 4 — Proposed Conditions - Drainage Subbasins and Site Characteristics Figure 5 — Soils Map Figure 6 — Flow Chart for Determining the Type of Drainage Review Required Figure 7 — Distance to Outfall Figure 8 — Bond Quantity Worksheet Figure 9 — Maintenance and Operations Manual LIST OF APPENDICES APPENDIX A — WWHM Report APPENDIX B -- Conveyance System Calculations — Not included (or Conditional Use Permit submittal APPENDIX C — Plans Salvation Army Renton Corps Expansion, SvR No 12025 Page ii Preliminary Technical Information Report July 26, 2012 1.0 PROJECT OVERVIEW 1.1 General The Salvation Army Renton Corps Expansion Project (Project) is located at 720 South Tobin Street, Renton Washington, 98057. The site is 0.43 acres and is bordered by South Tillicum Street (Tillicum) to the north, South Tobin Street (Tobin) to the south, Williams Avenue South (Williams) to the east, and Burnett Avenue South (Burnett) to the west. The improvements to the site include interior building improvements, adding onto the building to extend the building footprint to the west, and replacing the vehicular parking and loading area west of the building with pedestrian sidewalks. This report presents technical information and analysis regarding surface water management for the proposed redevelopment to tax parcel 0007200140. The redevelopment of the parcel will meet the conditions of the City of Renton (Renton) Municipal Code for surface water control and requirements of the King County Surface Water Design Manual (KCSWDM) dated January 9, 2009 and Renton's February 2010 amendments to the KCSWDM (SWDM Amendment). See Figure 1 for a summary of the Project in the Technical Information Report (T1R) Worksheet. 1.2 Pre -developed Condition The parcel contains a 7,700 square foot (sf) building with a parking lot on the cast end of the parcel and some additional parking and a loading area to the west of the building. Garbage and recycle receptacles are kept in the northwest corner of the parcel within the paved loading area. There are several large trees around the perimeter of the parcel_ The parcel is relatively flat with elevations ranging between 37 to 40 feet. Figure 2a shows the Project location with respect to the major roadways of Renton. The paved area west of the building drains to a catch basin, which discharges to the public storm drainage system in Tillicum. The parking lot east of the building also drains to a single catch basin. The survey currently does not show where the catch basin discharges, though field review shows an elbow on the pipe to the north. South of the paved parking/ loading area, there is a courtyard that is surrounded by a solid screening wall that impedes sheet flow. The area within the courtyard is a mixture of pea gravel and concrete walkways. No formal storm drainage structures are observed in this area. It is assumed runoff infiltrates within the pea gravel portion of the courtyard. There is another screening wall to the north of the building along the alley. The sidewalk between the building and the screening wall is sloped to the north, away from the building, and then sheet flows along the back of the wall to the end of the building. The building downspouts are piped. The public storm drainage system discharges to Cedar River, which is located to the northeast of the parcel. There are no existing stormwater Salvation Arany Renton Corps Expansion, 5vR 12025 Section 1.0 Preliminary Technical Information Report Page I of 37 July 26, 2012 water quality treatment or flow control facilities located on the site. figure 3 shows the existing conditions flow patterns. Table 1- I includes a summary of the exiting site coverage areas. The maps available on Renton"s website were reviewed and the parcel does not fall within a coal mine hazard zone, erosion hazard zone, flood hazard zone, landslide hazard zone, or steep slope zone. The very eastern portion of the parcel falls within Aquifer Protection Zone 1 as shown in Figure 2b. Per email correspondences with City of Renton, the parcel falls within the one year capture zone, therefore effectively making the entire site fall within Aquifer Protection Zone I _ Table 1-1: Existing and Proposed Land Cover Summary Notes: 1. Disturbed Area includes onsite and ROW improvements (sidewalk connections) 1.3 Proposed Development Salvation Army proposes to redevelop the western portion of the parcel. A portion of the building will be remodeled and the building footprint will extend 20 -feet further west. The garbage and recycling receptacles will be housed inside the redeveloped building. The paved vehicle loading and parking west of the building will be removed and replaced with sidewalks to provide pedestrian access to the building. A new pedestrian access connection will extend to the sidewalk along Tobin. There are no improvements to the parking lot east of the building. A new fire service will be installed for the building's new sprinkler system and will be fed off of the existing 8 -inch main within Burnett per Renton's direction from the October 14, 2010 pre - application meeting (2010 meeting). A new side sanitary sewer will connect to the existing public sanitary sewer main within Tillicum. 1.4 Proposed Storm Drainage Facilities The existing collection and conveyance system within the parking lot east of the building will remain and no improvements are proposed as part of this redevelopment. The majority of the new and replaced sidewalks within the western portion of the site will sheetflow onto new or existing landscaping and be dispersed. Figure 4 shows the proposed drainage patterns. The replaced sidewalk north of the building will sheetflow away from the building and onto Tillicum. For the 15 -foot wide sidewalk between the building and Burnett, runoff will either sheetflow into the new landscaping or be collected in a new catch basin, which will connect to the existing storm drainage lateral within the site. The existing catch basin in this area will be Salvation Army Renton Corps Expansion, SvR 12025 Section 1.0 Preliminary Technical Information Report Page 2 of 37 July 26, 2012 Predevelopment Conditions Post Development Conditions Disturbed Area (acre) 0.14 0.14 Impervious Surfacing Area (acre) 0.11 0.11 Pervious Surfacing Area (acre) 0.03 0.03 2 -year, 24 hour peak flow rate (ets) 0.03 0.03 I0- ear, 24 hour peak flow rate (cfs) 0.04 0.04 100- ear, 24-hour peak flow rate cfs 0.05 0.05 Notes: 1. Disturbed Area includes onsite and ROW improvements (sidewalk connections) 1.3 Proposed Development Salvation Army proposes to redevelop the western portion of the parcel. A portion of the building will be remodeled and the building footprint will extend 20 -feet further west. The garbage and recycling receptacles will be housed inside the redeveloped building. The paved vehicle loading and parking west of the building will be removed and replaced with sidewalks to provide pedestrian access to the building. A new pedestrian access connection will extend to the sidewalk along Tobin. There are no improvements to the parking lot east of the building. A new fire service will be installed for the building's new sprinkler system and will be fed off of the existing 8 -inch main within Burnett per Renton's direction from the October 14, 2010 pre - application meeting (2010 meeting). A new side sanitary sewer will connect to the existing public sanitary sewer main within Tillicum. 1.4 Proposed Storm Drainage Facilities The existing collection and conveyance system within the parking lot east of the building will remain and no improvements are proposed as part of this redevelopment. The majority of the new and replaced sidewalks within the western portion of the site will sheetflow onto new or existing landscaping and be dispersed. Figure 4 shows the proposed drainage patterns. The replaced sidewalk north of the building will sheetflow away from the building and onto Tillicum. For the 15 -foot wide sidewalk between the building and Burnett, runoff will either sheetflow into the new landscaping or be collected in a new catch basin, which will connect to the existing storm drainage lateral within the site. The existing catch basin in this area will be Salvation Army Renton Corps Expansion, SvR 12025 Section 1.0 Preliminary Technical Information Report Page 2 of 37 July 26, 2012 demolished. The new building downspouts will be piped and connect to the existing storm drain lateral. The new footing drain for the building's expanded foundation will pass through a sump prior to connecting to the existing storm drain lateral. The Project does trigger the requirement to install stormwater flow control or water quality treatment facilities; therefore, the Project does not propose any stormwater flour control or water quality facilities as part of the redevelopment. 1.5 Soils United States Department of Agriculture Soils map information indicates that the site soils are "Urban Land", see Figure 5. Urban land consists of large areas of impervious surfaces such as pavement and buildings. Salvation Army Renton Corps Expansion, SvR 12025 Section 1.0 Preliminary Technical Information Report Page 3 of 37 July 26, 2012 FIGURE I TIR WORKSHEET KING COUNTY, NVA.SIIINii ION. YS'AI'LIt DiI(iN MANLIAL 7ECI-INICAL INFORMA'rION REPORT (T{R) WORKSHEET Purl 1PROJECT OWNER AND PR0 _CT ENGINLLR i Owner I'hone Address ProjnrtFngineer,}__� � �, ��:<•; �, Company �1•—'�.�„ Y f Phone rpt Yr �,r ., r,'•�;%� Part 3 TYPE OF PCRMITAPPLICATION al Services Sut'diviSon I Short Sul ! UPD ❑ Mudding Services i ! CornrnCrical / SFR ❑ Clearing and Crading U Right -of -Way Use { Nother ( ,,:,.1s- n. \ u '> Part 2 PROJECT LOCATION AND DESCRIPTION Project Narne-:.1� iv•,. Ar..,n=a:,•, i , DDCS Permit N _ I ocaticx7 Township Range Section Silu AL:llres5 Part 5 PLAN ANDRE PORT INFORMATION Part 4 OTHER REVIEWS AND FERMITS Technical Information Report iJ DFW MPA ❑ Shoreline Type of Drainage Review [Full "! Ta-geted 1 ❑ COE 404 Management (circle) Large Site ❑ DOE Dam Safety ❑ S%'cluial Dale (inchrcfe revision T -, &'. 1r' ❑ FEMA Floodplain RockeryNault/ ❑ ESA Section 7 dates)' W _ ❑ COE Wetlands dales). Dale of Final: ❑ Other Part 5 PLAN ANDRE PORT INFORMATION Technical Information Report Sile hnprovement Plan jil Plans) Type of Drainage Review [Full "! Ta-geted 1 Type (circle one; Full I Modlfied (circle) Large Site Small Site Dale (inchrcfe revision T -, &'. 1r' Daie (include revision dates)' W _ dales). Dale of Final: Dale of Futal. Part6 ADJJSTMENT APPROVALS Type (circle ane] Standard I Complex 1 Preapphcalion r Lxperimenlal r blanket Dcscripllon: (include conditions in TIN Section 2) Dale of Approval 21 Stir lacy 1V,r.cr [kswn ibhuwal Salvation Army Renton Corps Expansion, 5vR 12025 Preliminary Technical Information Report Elm Section 1.0 Page 4 of 37 July 26, 2012 FIGURE 1 TIR WORKSHEET, continued KING (-OI]l 11', WAS IIIN(II4iN, tiIIKI A(F WA 1(.K I)F.51(i\' AIAN11AI. TECHNICAL INFORMATION REPORT (T!R) WORKSHEET Par; 7 MONITORING REQUIREMENTS Monitoring Required Yes Np describe _ Start Date, Ccmplehon Date - f ail S SITE COMMUNfTY AND DRAINAGE BASIN Communily Plan Special Dlstrlcl Overlays_ Drainage Basin fc Stormwater Requirements: Part 9 ONSITE ANDADJACENI SEN51 rlVE AREAS ❑ RiveoStream .. - _ ❑ Steep Slope V Lake ❑ Erosion Hazard ❑ Wetlands _ _ ❑ Landslide Hazard ❑ Closed Depression ❑ Coal Mine Hazard ❑ Floodpinin ❑ Seismic Hazard LJr—� Other ld HaDllat Prolection I pal rt 10 SOILS Sod Type Slopes Erosion Poleribal ❑ High Groundwater Table (within 5 feet) J Sole Source Aquifer ❑ Other ❑ SeepslSpririqs ❑ AddiUun d Sherr!s Al[achetl ?1111() Sn; In" Wnic, 1)„,_n Mkun;al Salvation Army Renton Corps Expansion, SvR 12025 Preliminary Technical Information Report Section 1.0 Page 5 of 37 July 26, 2012 FIGURE I TIR WORKSHEET, continued KIN(; C'UI:N I Y, WA':l Iilw; I'ON. SIIt ACI:: %VA II - It PLS IGN \IANU,11 TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 11 DRAINAGE DESIGN LIMITATIONS HtFkRIhN(,F ❑ _Core 2 — 4lfsite Analysis ❑ ensitivelC_ritical_Areas- ❑ SEPA U Other El ❑ Additional Sheets Attached LIMITATION f SITE CONSTRAINT L rasion and Sediment Control CSC Site Supervisor Contact Phone: _ After Hours Phone: Maintenance and Operation Responsibfily i- P ivale'7 Public It Private, Maintenance Loy R__e_quired: Yes 1 No Financial Guarantees and provided Yes 1 No Liahility _ - - Water Quality Type: Basic r Sens. Lake ! Enhanced bass” 1 13o3 (inriiidn farility summary c haat! or Exempton No." i _���� `-i.:«. (.+r,. t,)i.,•� Landscape Managemcnt Flan Yes ! No _ —I Special Regtrirernents (as applicable) Area Speci"ic Crainage Type GDA 1 SRO! MDP a BF 1 LMP! Shared Fac 1 None ReriO;ements Name y Dalmeation I ype. Major 7 Minor ! Exemption ! one 100 -year Rasa Flood Elevation (or range) _ _^ Datum. Flood Pfm6chori Facilities Source Control (comm.; Industrial landuse) ?f« P) Sir Yat: kv.iiri .7r+ren M"I'1 d Descrih(P N'/ 1\ Describe landuse. rlesr;iihe any 5lruCl Ural Coritro:�s M I i) Yuu�r Salvation Army Renton Corps Expansion, SvR 12025 Section 1.0 Preliminary Technical Information Report Page 6 of 37 July 26, 2012 Part 12 FIR SUMMARY `JI IECT f Provide one TIR Summary Sheer Threshold Discharge Area) Threshold Discharge Area; name or description) Core Requlremeids {all 8 apply) Discharge al Natural Location Number of Natural Discharge Locations: j Offsite Analysis .,/A Level: 1 1 2 7 3 dated Flow Control Levei: I 1 2 1 3 or Exemption Number 1� • . (ridfacility summary sheel) SmaR 3110 BMPS . "„S. v•,_ I Conveyance System Spill containmenl locoted at: L rasion and Sediment Control CSC Site Supervisor Contact Phone: _ After Hours Phone: Maintenance and Operation Responsibfily i- P ivale'7 Public It Private, Maintenance Loy R__e_quired: Yes 1 No Financial Guarantees and provided Yes 1 No Liahility _ - - Water Quality Type: Basic r Sens. Lake ! Enhanced bass” 1 13o3 (inriiidn farility summary c haat! or Exempton No." i _���� `-i.:«. (.+r,. t,)i.,•� Landscape Managemcnt Flan Yes ! No _ —I Special Regtrirernents (as applicable) Area Speci"ic Crainage Type GDA 1 SRO! MDP a BF 1 LMP! Shared Fac 1 None ReriO;ements Name y Dalmeation I ype. Major 7 Minor ! Exemption ! one 100 -year Rasa Flood Elevation (or range) _ _^ Datum. Flood Pfm6chori Facilities Source Control (comm.; Industrial landuse) ?f« P) Sir Yat: kv.iiri .7r+ren M"I'1 d Descrih(P N'/ 1\ Describe landuse. rlesr;iihe any 5lruCl Ural Coritro:�s M I i) Yuu�r Salvation Army Renton Corps Expansion, SvR 12025 Section 1.0 Preliminary Technical Information Report Page 6 of 37 July 26, 2012 FIGURE I T[R WORKSHEET, continued KING ('UiJN'I')'. WASH IN61ON. �UItI A('i: WA FE It I)F.SI(iN MANI:AI. TECHNICAL INFORMATION RFPORT (TIR) WORKSHFF-1 Oil Control Fligh use Site Yes No' TfeaSme)t BMP Maintenance Agreement: Yes ! No _ with whom? Other Drainage SlructUres Dcscridc. part 13 EROSION AND SEDIMENT CONTROI RFOIJIRFMFNTS MINIMUM ESC REQUIREIVIEN1 S MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION AFTER CONSTRUCTION LJ Clearing Limits ❑ Stab!hxe Exposed Surfaces ❑ Cover Measures U Remove and Restore Temporary FSC Facr lilies V Perimeter Protection lJ Clean and Removu All Silt and Debris. Ensure * I-raffic Area Stabilization Operation of Permanent Facilities U Sediment Retention LJ Flag Limits of SAO and alien space preservation areas J Surface Water Collection U Other LlDewatering Control' ❑ Dust Control ❑ Flow Control Part 14 STORMWATER FACII.ITY DFSCRIPTIONS (Note-. Inckide Facilil Su mary and Sketch) Flow Cont I TrPelDescriplion WaterCILiality 'Type/De_sc_r_plien ❑ Dolcrrtion LJ Biofiltration ❑ Infiltration U Welpool U Regional Facility U Media Filtration _ U Shared Facility U Oil Control _ ❑ flow Control U Spill control t3MF's ❑ I low Control Hmps U Other -- — ❑ Pther �OUrr tim laer l5`:drr Uraen Alnnunl I U-'GI7U T Salvation Army Renton Corps Expansion, SvR 12025 Section 1.0 Preliminary Technical information Report Page 7 of 37 July 26, 2012 FIGURE I TIR WORKSHF.F,T, continued KINIG Ct?L;N'rY, WAMIIWiTON. SIIKFACF %VA IT°ii OESiGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET ?art 15 EASEFAEN'rSFCRACTS U LDramage Easement 1,j covenant ❑ Naleve Growth PrtAedion Covenant ❑ Tract © pdfBF Part ?G STRUCTURAL ANALYSIS 1 ❑ Cast ,n Place Vauit Retairing Wall U Rockery > a' High © Structural on Steep Slope ❑ Dthe, (, ar to Civ engrrteer urMer my su{servis�on, hsve visited e#fe sett Actual srte candilions as observed were incorporated rola oris worksheet and the attached Tech1w-al Inlarmation Report To the bell aF mp krxyMedge the intorrnalion provided here rs acnurate SV-Jd0e AXP) SwC.— Wrgel lksiim Alm—d Salvation Army Renton Corps Expansion, SvR 12025 Preliminary Technical Information Report 1.1"109 Section 1 _p Page S of 37 July 26, 2012 IL mgIr 7' PROJECT SITE V mom qp r. -r • I )` -41 UnIf '~IMF'. VE s. r FIGURE 2b SENSITIVE AREAS MAP - AQUIFER PROTECTION v� CEDAR I Jf + 1 PROJECT �'— DISTURBED LIMITS (SHADED) _ 1 1 ti A Q U1 VER PROTB ON Za 2n i Salvation Army Renton Corps Expansion, SvR 12025 Section 1.0 Preliminary Technical Information Report Page 10 of 37 July 26, 2012 FIGURE 3 EXISTING CONDITIONS -DRAINAGE SUBBASINS AND SITE CHARACTERISTICS LL U- s � r Salvation Army Renton Corps Expansion, SvR 12025 Section 1.0 Preliminary Technical Information Report Page 11 of 37 July 26, 2012 w 1 2 H� -o- g a 2 n � � � �f • Tl lu 43 , A. i 3;11'r3A�d J1 iFl7i,C{ Salvation Army Renton Corps Expansion, SvR 12025 Section 1.0 Preliminary Technical Information Report Page 11 of 37 July 26, 2012 FIGURE 4 PROPOSED CONDITIONS -DRAINAGE SUBBASINS AND SITE CHARACTERISTICS � LL� x 0. n S annrany u-3nbng Salvation Army Renton Corps Expansion, SvR 12025 Preliminary Technical Information Report J; Section 1.0 Page 12 of 37 July 26, 2012 W � � 1 i O Ds, W jY S annrany u-3nbng Salvation Army Renton Corps Expansion, SvR 12025 Preliminary Technical Information Report J; Section 1.0 Page 12 of 37 July 26, 2012 FIGURE 5 SOILS MAP Custom Soil Resource Report Soil Hap (Salvation Amey Soils Map) I. From U -S. Department of Agricultural Web Soil Survey 2. Ur: Urban Land Salvation Arany Renton Corps Expansion, SvR 12025 Section 1.0 Preliminary Technical Information Report Page 13 of 37 July 26, 2012 2.0 CONDITIONS AND REQUIREMENTS SUMMARY 2.1 Conditions and Requirements SWDM Amendment was reviewed to determine whether a drainage review was required for the Project. Per Section 1.L I of SWDM Amendment, a drainage review is triggered because the Project adds or result in 2;060 sf or more of new and replaced impervious surfacing. Per Figure 1.1.2.A of SWDM Amendment and as shown in Figure 6, a Full Drainage Review is required for the project. Based on Table 1.1.2.A, all core requirements and special requirements could potentially apply to the Project. Each requirement was reviewed to determine whether it was applicable to the Project. Below is the discussion on each of the Core and Special Requirements. 2.1.1 Core Requirements Core Requirement 1: Discharge at Natural Location The storm water runoff will discharge to the existing storm drainage system within the right-of- way surrounding the site. These storm pipes are all part of the same network that discharge to an outfall at Cedar River. Therefore, the Project will maintain the discharge natural location and will not divert runoff onto or away from downstream properties. The discharge will not create significant adverse impact to downstream properties or drainage systems. Core Requirement 2: Offsite Analysis Of[site analysis is not required because the Project will not change the rate, volume, duration, or location of discharges to and from the project site as seen in attached WWHM report. The Project does not change the total amount of impervious area on-site. Core Requirement 3: Flow Control The runoff from the site is conveyed within a piped system to Cedar River approximately 0.1 miles downstream of the site. The outfall into Cedar River is downstream of Taylor Creek confluence; therefore the site discharges to a major receiving water per Table 1.2.3.B of SWDM Amendment. The discharge meets the requirements of the direct discharge exemption (page 1-33 of SWDM Amendment). Flow control facilities are not required and are not proposed as part of the improvements. Core Requirement a: Conveyance System The site is located out of an aquifer protection zone, therefore, vegetated lined channels may be used for conveyance. Though channels may be used, the Project's proposed conveyance systems will be piped and shall meet the requirements of the KCSWDM and SWDM Amendment to provide a minimum level of protection against overtopping, flooding, erosion, Salvation Army Renton Corps Expansion, SvR 12025 Section 2.0 Preliminary Technical Information Report Page 14 of 37 July 26, 2012 and structural failure. Since there is no change in floe- characteristics to the existing conveyance system, the existing conveyance system is not analyzed for conveyance capacity. Core Requirement 5: Erosion & Sediment Control Erosion and sediment control will be provided to the maximum extent practicable to prevent sediment from being transported to downstream drainage facilities, water resources, and adjacent properties. An Erosion and Sediment Control (ESC) Plan will be prepared and submitted as part of the submittal for any land disturbing activity permit packages. Erosion and sediment control measures will be maintained in place until the site is stabilized and permanent measures are in place. Core Requirement 6: Maintenance & Operations The Owner will be responsible for maintaining the project site or entering into a maintenance contract for all required storm drainage facilities. A draft maintenance manual is provided in Section 10. Core Requirement 7: Financial Guarantees & Liability The contractor will post with Renton a bond, assignment of funds or certified check in compliance with SWDM Amendment. Core Requirement 8: Water Quality The Project meets the Surface Area Exemption that applies to this core requirement. The Project has less than 5,000 sf of new pollution generating impervious surface (PCIS), less than 5,000 sf of new plus replaced pollution generating impervious surface, and less than 35,000 sf of new pollution generating pervious surface. The utility trenches for the new fire service and Side sanitary sewer service within the streets are excluded from replaced impervious surfacing per SWDM Amendment definitions. 2.1.2 Special Requirements Special Requirement 1: Other Adopted Area -Specific Requirements At this time, there are no known adopted regulations that apply to the Project. Special Requirement 2: Flood Hazard Area Delineation This requirement does not apply to the Project. The Project is not within or adjacent to a flood hazard area. Special Requirement 3: Flood Protection Facilities This requirement does not apply to the Project. The Project will not rely on an existing flood protection facility or modify or construct a new flood protection facility. Salvation Army Renton Corps Expansion, SvR 12025 Section 2.0 Preliminary Technical Information Report Page 15 of 37 July 26, 2012 Special Requirement 4: Source Control The proposed project requires a commercial building and site development permit. The garbage and recycling receptacles are going to be moved to inside the building and therefore eliminating the potential for contaminated runoff from the garbage storage area. The other redeveloped impervious areas are pedestrian sidewalks and are considered non -pollution generating. It is unlikely runoff from these area will come into contact with pollutants_ Water quality source controls applicable to the proposed project will be reviewed and applied per KCSWDM and Renton Municipal Cod IV. Special Requirement 5: Oil Control This requirement does not apply. The site is not considered a high -use site. Special Requirement 6: Aquifer Protection Area This requirement does not apply. The Project is not within an aquifer protection zone. Salvation Army Renton Corps Expansion, SvR 12025 Section 2.0 Preliminary Technical Information Report Page 16 of 37 July 26, 2012 FIGURE 6 FLOW CHART FOR DETERMINING THE TYPE OF DRAINAGE REVIEW REQUIRED Sr: "T iln• I 1 TDR APi Ai -,r R"'ti Tr W I MAW 1 1.2 A FLOW C14ART FOR r)FTF.R%11Y1Nf: IYPF OF DRAINAGE REVIEW RFQt`IRFD I is the projen a stripja twnrty resrdeetw project tNt res_;a I '''Doa s• of S&L -LLL PRWEC[ DRAINAGE rrew ardlor mplaced Jmpervfdus surface cr �7 003 s` cf Jand dlshirb1rV REv1EW actfvfty AND meets the farowng r-1er a + Section 1.1.2,1 s The project iesuits in .5 DCC sf Df new Jmpervlous surface. arc, 35.030 Nofe The Argil ngy also bo Sr of rfew perwdus surrsoo subled to Tageted DFowape RSvJew as dajerrrrnled below. Dies e* new or redewNapment Does the prole—. Pave'ne charac.e- "ra of one or -cre cf 1he fol c—rg projacl'asult in 2,000 s! of new ralw;fvies A Rujiw_1s swu rcia detailed threshuiC langaaga on P. '-'3y? arWa'repfeted rarpervlous wolhee or 1 Proje ;ts containing x adjac i! 1c a ffaod erosion, u, steep slope .35.000 of o1 new pervious surface" hazard area or documented drainage prcblern pro)ects nshin a Jandsfkre hazard arra o r landslide hazard drafna$r arra o' prc;ecm that propose -7 CCD sf r1 ac f project is r Shall Droject Drainage tevmm) of land disturbing echwry Prajc V'S propco rg to canWruct or modify a dar-iage ptpc;dlrh that is S7' or larµes or recevee -uioR trcm a 2' D- a^3er crainage piaer6i[c^ teassess,r+hehe cre rage revvw is -[!r.:i.rrd por Se hn 1.1.1 (p. '-8) � Co" $) Coca tnP rrr)er,.•esult m -C arms rt new Impervious surface Nilfrin a subbasin or mull Fie suoCasiis that are hrcraukr ally connec'ec? Cit} of Ren.&:. 1 10 Yes TAR,GTEII DRAMACT REVIEW Sect oe 1.1.2.2 PULL DRAINAtZ IkEUE'N' sect,on 1.1.2.3 4RCiF PRC7JFCT DRAINAG); Rf3VTRW 5ndum 1 1 P a 200' Sxfr ca Wa1.r Dc4gR i11ul11kl..111 ! .i'fll�lr Salvation Army Renton Corps Expansion, SvR 12025 Section 2.0 Preliminary Technical Information Report Page 17 of 37 July 26, 2012 3,4 OFF-SITE ANALYSIS 3.1 Standard Requirements Not applicable. Osite analysis is not required because the Project will not change the rate, volume, duration, or location of discharges to and from the project site as seen in attached WWHM report and Table ] - l. Salvation Army Renton Corps Expansion, SvR 12025 Section 3.0 Preliminary Technical Information Report Page IS of 37 July 26, 2012 4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN 4.1 Existing Site Hydrology The entire parcel discharges to the public storm drainage system, which discharges to Cedar River approximately 0.1 miles northeast of the site. The paved area west of the building drains to a catch basin, which discharges to the public storm drainage systern in Tillicum. The parking lot cast of the building also drains to a single catch basin. The survey currently does not show where the catch basin discharges, though field review shows an elbow on the pipe to the north towards Tillicum. South of the paved parking/ loading area, there is a courtyard that is surrounded by a solid screening wall that impedes sheet flow. The area within the courtyard is a mixture of pea gravel and concrete. walkways. No formal storm drainage structures are observed in this area. It is assumed runoff infiltrates within the pea gravel portion of the courtyard. There is another screening wall to the north of the building along the alley. The sidewalk between the building and the screening wall is sloped to the north, away from the building, and then sheet flows along the back of the wall to the end of the building. The building downspouts are piped. There are no existing stormwater water quality treatment or flow control facilities located on the site. 4.2 Developed Site Hydrology The improvements are limited to the western third of the parcel. The site hydrology for the area outside of the disturbed limits will not change. The solid screening walls west of the building will be removed except for the wall between Tillicum and the building. The building footprint extends further west; therefore, more area will be directed to the downspout piping network. Sheet flow from the new pedestrian walkways will be directed to the landscaping to be dispersed. The wider sidewalk connection to Burnett will have a catch basin that collects any runoff that is not dispersed. 4.3 Performance Standards 4.3.1 Flow Control Facilities The Project is located in a peak flow rate control standard area, but is exempt from required to install flow control facilities since the site discharges to a receiving water body and meets the requirements of the Direct Discharge Exemption per page 1-33 of S W DM Amendment. See Figure 7 for the measurement from the site to the discharge to the receiving water body. 4.3.2 Water Quality Facilities The new plus replaced pollution generating impervious surface is less than 5,000 square feet; therefore, water quality treatment is not required nor proposed for the site. Salvation Army Renton Corps Expansion, SvR 12025 Section 4.0 Preliminary Technical Information Report Page 19 of 37 July 26, 2012 FIGURE 7 DISTANCE TO OUTFALL Salvation Army Renton Corps Expansion, SvR 12025 Section 4.0 Preliminary Technical Information Report Page 20 of 37 July 26, 2012 5.0 CONVEYANCE SYSTEMS ANALYSIS AND DESIGN 5.1 Standard Requirements The conveyance system for the improvements will consist of a catch basin and pipe network. Per SWDM Amendment, the piped system "shall be designed with sufficient capacity to convey and contain (at a minimum) the 25 -year peak flow. All proposed facilities will meet or exceed this requirement. 5.2 Proposed Conveyance System Runoff from the building's roof will be piped to the existing storm drainage lateral on-site. Sheet flow from the sidewalks that is not dispersed will be collected in a catch basin and connected to the existing storm lateral. A small portion of the landscaping and sidewalks may sheet flow onto the public sidewalk as they do in existing conditions due to the need to match grades along the public sidewalks. Sizing analysis for the conveyance system has not been done for the Conditional Use Permit submittal and will be provided later in the design process_ Salvation Army Renton Corps Expansion, SvR 12025 Section 5.0 Preliminary Technical Information Report Page 21 of 37 July 26, 2012 6.0 SPECIAL REPORTS AND STUDIES 6.1 Geotechnical A geotechnical report is not required for the Conditional Use Permit submittal per the pre - application meeting on October 14, 2010. Salvation Army Renton Corps Expansion, SvR 12025 Section 6.0 Preliminary Technical Information Report Page 22 of 37 July 26, 2012 7.0 OTHER PERMITS 7.1 Other Permits No other permits are known at the time of the Conditional Use Permit submittal_ Salvation Army Renton Corps Expansion, SvR 12025 Section 7.0 Preliminary "technical Information Report Page 23 of 37 July 26, 2012 8.0 CSWPPP ANALYSIS AND DESIGN 8.1 ESC Plan Erosion and Sediment Control has not been reviewed at this time and an ESC Plan has not been completed as part of the Conditional Use Permit submittal. The measures that will likely be employed to keep sediment from being transported off-site and maintain water quality standards include, but are not limited to, the following. + Catch basin inserts • Silt fence A final ESC Plan will be prepared by the Contractor according to the Contractor's means and methods and construction sequencing. The ESC Plan will be prepared in accordance with Section 2.3.1.1 of the SWDM Amendment. Salvation Army Renton Corps Expansion, SvR 12025 Section 8.0 Preliminary Technical Information Report Page 24 of 37 July 26, 2012 9.0 BOND QUANTITIES, FACILITY SUMMARIES, & DECLARATION OF COVENANT 9.1 Bond Quantity Plan A Bond Quantity Worksheet has not been filled out for the Conditional Use Permit submittal. As the Project progresses through the permitting requirement, a Bond Quantity Worksheet will be included in subsequent submittals of this report. Figure 8 is a blank version of the Bond Quantity Worksheet that will be included at a later date. Salvation Army Renton Corps Expansion, SvR 12025 Section 9.0 Preliminary O'echnical Information Report Page 25 of 37 July 26, 2012 ^W� W U) L w CO m L N E N Q 0- E E Q7 CO FIGURE 8 BOND QUANTITY WORKSHEET (BLANK) A 7 Salvation Army Renton Corps Expansion, SvR 12025 Section 9.0 Preliminary Technical Information Report Page 26 of 37 July 26, 2012 Au a`s i V y m � C 3 ffi� o A d A 7 Salvation Army Renton Corps Expansion, SvR 12025 Section 9.0 Preliminary Technical Information Report Page 26 of 37 July 26, 2012 FIGURE S BOND QUANTITY WORKSHEET (BLANK), continued 16 Q w O C cq C3 MV i.1..1 C O E 9 O Ca E Vl SV N U_ s as �CC� N O 3 > D � Salvation Army Renton Corps Expansion, SvR 12025 Section 9.0 Preliminary Technical Information Report Page 27 of 37 July 26, 2012 'i]tltl0 S SS aa8888 o a4SS3SSSSSS 4 b d C?d O3 Ptl. lJ t] dd D d OOi] tl tl d 4 88 IN 8 8888.8 8 888888_ S 8 Y ,8 ,8388 ,8 8888 ,88 888 '�Yui'n G •'u ��' �'ff5a$ b .�.. ....��cri 7 G fit E 2 i E E 49 a 4.43 SV N U_ s as �CC� N O 3 > D � Salvation Army Renton Corps Expansion, SvR 12025 Section 9.0 Preliminary Technical Information Report Page 27 of 37 July 26, 2012 FIGURE 8 BOND QUANTITY WORKSI IEET (BLANK), continued E 47 Lo Salvation Army Renton Corps Expansion, SvR 12025 Section 4,0 Preliminary Technical Information Report Page 28 of 37 July 26, 2012 FIGURE S BOND QUANTITY WORKSHEET (BLANK), continued E QS U) INA a Salvation Army Renton Corps Expansion, SvR 12025 Section 9.0 Preliminary Technical Information Report Page 29 of 37 July 26, 2012 FIGURE 8 BOND QUANTITY WORKSHEET (BLANK), continued N y U) e Salvation Army Renton Corps Expansion, SSR 12025 Section 9.0 Preliminary Technical Information Report Page 30 of 37 July 26, 2012 FIGURE 8 BOND QUANTITY WORKSHEET (BLANK), continued E m co Salvation Army Renton Corps Expansion, SvR 12025 Section 9.0 Preliminary Technical Information Report Page 31 of 37 July 26, 2012 FIGURE S BOND QUANTITY WORKSI lI✓LT (BLANK), continued E co Salvation Army Renton Corps Expansion, SvR 12025 Preliminary Technical Information Report 81 21 sl H I R Section 9.0 Page 32 of 37 July 26, 2012 1.0.0 OPERATIONS AND MAINTENANCE MANUAL 10.1 Maintenance Recommendations Operation and maintenance requirements for the proposed drainage elements have been provided for reference in Figure 9. Salvation Army Renton Corps Expansion, SvR 12025 Section 10.0 Preliminary Technical Information Report Page 33 of 37 July 26, 2012 FIGURE 9 MAINTENANCE AND OPERATIONS MANUAL hl'I'i:NIAXrS ,�lafid'7t.i,1NCEIIfgU314F.Tfl''iSFIFKh'I,.{3�4'1.'[)ufF2iA_C(?X31'i:1'AnCF.A.iD15�(?FACli.11'ifR NO, 5—CATCH BASINS AND MANHOLES Mainteruaca Ralector Praftiem Condition Whwh Maintonn.to is N odvri Rm'l s Expocled Who,, 3 GOmpanenl Mainlcoanco is Ruler "d 5lrcu:hur, `;etlinhnM sOdirnenl e>'reads oty�s of Mo depth frwrl IM! Swap of Cncsi basin eNloinu hp bollom of the catch basin b";wert of the ioahntnt_ lowest pyo k5ta a our of hfn rafch basin or is within 5 inches of the kivt4 ofa* j wceti pipe info or oul al €ho calm baso_ Trash anti deb65 T(aSh or debris of m016 Ithsrs Y Cuh k tool s711kh Na Brash or drbils bloat or N. located ia"diately bs rro€t or Iho catch basilt polrnpaffy Nock" pntr&" to Opening of is blacking c2pacily of the cif& ba Sia eeteh b,isn. by more then 10%. Trash of debris in the catch basin that exceeds rfxtho depth tom Rut balsam of bas'st In invert it. No hash or daoris in Pw catch basin. tamest pipe coda ar oul of the hasar Dead anumls, or vwt2lion that c w generale NO load aoiMAM or vegetation odor that cofrld eauso cm plekda or datwrous prosant wkhn ca" busin. gases (e,g_, nwifiarne}_ Qepaslts of garbage cveeeffvv l wbie Ipat L. No uandil on pmsnll WMch wound volumg. M03d or suppoel the breeding 04 p Sevs ace rodent✓. Ramage to Name Garner of frame exWrds more Man'A 41Gh past rramo is *van wish ML walk, top Nab parb lsoe iota the &kool 19 applcaWe). Top i4ab have holes Iwgw Than 2 SITZ -o inches or Top slab is krr of boles arM GadiS. cracks wkier than Kinch, Frame notOkla fkiah ah lop tlab. i.e.. F"saaw 1s sain llush on top Blab. sepwason of more Nmn 34 inch of the frame ktvn Iho lop slab. Cnial Y5Ovals to Gackb wider Fhon Y, inch and boyar than 3 teat, Catch basin €s Stout and boaern any evldervice of still particles enlerklg "also sarhd_ beskh through macka. Or makgt anm person jnrdges that cattle basin is unsound_ Cracks Mclennan Minch Ord "ef Ihwn f feut No gooks more than '4 fnch wide at Ot the )Dint of any inletloutlat pips or any ovine" aha jainl atmfayp~ pipe. Of so'sl parlides eIRpYYIg tatcf5 basin Through Cro(1ta, Sehfomenit Celch basin has soiled mpig Tush 100 or has daskl repfaoed or repaired to dgsign misanlgsarrent rolalol moue than 2 fthas M of akgnmwq. slandards. r-naged pipe joints Cracks wrier than !44 h at lsa take 01 afa No 0n4" mwo Iharr V< loch wkfe at W"Voutldl pipoa Of ismy oviderm or 6A emari ng line Pit of leflououlel opts ft catch basin at the I€drn of Inn kitemrlul plods. c:aNbmhOnds end Any aMo foe of contam€nanto of poSution sun Materia mmoved and dispwcl of _. pnllufko as ad. gaAW0. emCrt" Ntirribs M pawl. accarhAN to appfii:" roil.Auians. sown "aldol emps "tenwted 1 appropriabt, t,b ooa+tarninmts praaent other than a ncatace ail film. Inleafoullet pipits doh of sedgy eul. "WOulhe€ Pipe Sadimant 5edrrhixg fang 2o% or mom or the pipe. accumu€alion crash 2nd dohs Trash and Cbbris acculft"led at k4dtfOWkl No trash of debris In piyas. pipes (wncludes IlaaUrbles and nowlfoatebles). Damaged Lacks adder than W mch at the'iokhi of Via No crocks mora than `/.-VA h wide at WOOVOLght poft or any harm *(toll enlarktg ft jotfnl of @* irloVoulat pips, at the jams of the a kithaulet pipes. "VLY Shuf hcc N'alra 0ikn hl,aulal- Appendix A AA IAW2fNIu Salvation Army Renton Corps Expansion, SvR 12025 Section 10.0 Preliminary Technical Information Report Page 34 of 37 July 26, 2012 FIGURE 9 MAINTENANCE AND OPERATIONS MANUAL, continued AI`pF>\'DIS ,l \1.11'ilF:vsA't.-li kl'.c ll+IkLla lk:�t$Il.trls'CIS;rtR01,.["[1TIVp)'o\�('};. Til lY[�F•tt"Ii.F I1pS NO.5 —CATCH BASINS AND MANHOLES #alnteeance Meet or problem Condhliun M*h a6ahrlenanca is Headed - Rosutts Expected Whoa Companarl! _... �_ V%JIV Veale vpenezg C,role Y+itll mticr"n'1; ride Mandonauce Is Part—d reeW rkr'*s (Ca(eb Ha51n5) Crate opening meals design standards. 7ravh and esb, a Trashwod dulnis that is t>hxAing more than 20% Crate free of trash and dehds_ of p�ala surfauir. kot xO to gutdelinms for <4pasai Crate miautg urbrolkon memhprtsl of tale grata. Grate is a place enol wt!(440i9n UawKd yr miwN Any open structure requires urgent Standards, maNdoreanoa. ldanlado 17 +.r1{.Id 1;ov 04 nol In place Cawardid pr0#:0s openlnp to Coverr4d is .Nss4og or onf)t om ally in peace. Any oven-I-ciure rogniras u.gont struch". msirgsnence. LOohing 110C!1arlilm wChatUM's COAIW he upenpd 4y pare Machan%5m opens Wdh props( lacks. Not Working mmnlfi an paesan when pmpe, I"s 0*11s rxnnal 0a su�od5oillodring WerAid dose rroi work CNm mdklgrn person eanrwt eommm COMAd can be removed and Cae nft ditrk ltt In Hemam nowild after app" 00 *D , of tiff. reins Wed by one ma€ntonanc* p9isot7. IJs12f70r1 Salvation Army Renton Corps Expansion, SvR 12025 Preliminary Technical Information Report XJ9 Slnrm>• W;,Ia OeAgn ilmaral :. Apmndix A Section 10.0 Page 35 of 37 July 26, 2012 FIGURE 9 MAINTENANCE AND OPERATIONS MANUAL, continued APPENUlx t1 �lAiViFi:.`sLACF,FiF'.(�L?ilt E.�if�y71 F1?R{9.[l1l'(YJ1[IROL.(C7�lVf-.1".ilf fi_A1cF?41`�71ryC11311C5 NO. fi — CONVEYANCE PIPES AND DITCHES aS nrennncn bntec[ar arohfam CcRonio" Moo maln[ananco is Need.4 ResWlls Eapaclod whvs Colnpoienl mainlonance Is parfamwo itipes $(:Jinni R (TKbds Aocwnutated sediment oe dahns thal em eds Waler nV&i; MAI, lhrc otl aims- aceWmuiatiar YOX or ltw diamely aiiho pipe. Lo"Holvmols Vagalak-hoots Ihw rmuca free Itmvefnenl of Wale( Rows l'Oefy 4M("h pipes. walef Through Apes. Coma+ninants ara! (arnavcd arlJ JisfwseJ of Rnlreuidesrcb of rnMor*nants or pafulion —1,Materiais potkRrorl as sol, gasel»e, concrete startles of pa%m attoid� j 10 Vpiicoble regvaalwns. Source wntrol UW5 vWemenfed if apprwwe. Nocentannlsards pes�rJ ofhvr Than a ay:4.ca pi l}kn. Danmgo In prbleo;va 3' Otatklm cnaBng it dnmagod: rust IX wffr lol Frpe mpaifed or mploctil. coating ox wrrasian is vroakarwrp the sl+ ctwal integMy of any part of Mo. Damagad Any crani M deaeaxbs a,tr oats socson area of Pipe rapairrtl M replaced. pWe by more Man W%w rs Bete;toted to have - wcukenod shuclural integrity of the ptpe. I rash and debris execds r wbic fool pu 1,000 Trash anti JrzLris clkr J bnni Mrehei Trash And dvWrf, sgrmrn fml of dkh and slopes. d Lh2a. SedknCnt Accomrda[ed sediment prat exceeds 20%of Tho 04ch clearreddlusired of atl sediment aOCunrplanorr d -q,- depll,. 2nd debris so fhat a mAtuh— design. h4xfocrg ,reals hny Ii4lrrepa w muiswwe vagelativn winch may Nwi am and nuisra vaAf,.al" [afr0iute o hazard to Ce mly personnel or,ho rer,,*"d aceatding 10 appicabw pubbc. rCgri0S )ft No danger of r iii vegolation where ColxfYY petsdnnbl Or the puNk Mghl FIOAMAy te. Wlmr+sls temdr+ad and dtypeaed of Conlsminanif aid Anycvidan 4 witarrtinams Or P"ubOn each prilhAm, as og. ga Am. conaolo af—is m palnt. as 'Jlfv to applicab a ragulatioab. Sowoe control amps irrplemert[cw -0 appropriala. No conlarninanis proaenl olha Bran a sistace al hint. Vegelationpra[ reduces bee moviarttani ofiulaf waist doors iramy through ditches. Vegeialwri through *lchr Any erosim ohserxd br: a ditch gopa. Ems6n dai9a®a to Siepes sip not etoOv slopes Rode flnitlg oto Of Ond sayer M lets of rock exists above m1w sub design 3WffAyrQS. pl; ow or misstro ([r area 5 wjh a Met m more, any dxpowd naa,re Appxcubro) soil 20MSwRh WLKC1I-signAlanaul--,lppendi%A "M f±'rf �iNfy Salvation Army Renton Corps Expansion, SvR 12025 Section 10.0 Preliminary Technical Information Report Page 36 of 37 July 26, 2012 FIGURE 9 MAINTENANCE AND OPERATIONS MANUAL, continued AVVI:X 01X)5 %MIND){\AWI. i.£Y)IIIREAIT;N7N V I M("f)h3IMI VONVGYANf'C. A1411':tlp{'M'l l oll5 NO. 11— GROUNDS (LANDSCAPING) Maintenance 4efaer er P-0.. C dglm wh tdaMl ruri+u Is Needed to Rs BxjO Ied wk.. I compo""41 A7aFr fan»Iwe s pv$ow .d Gla Trash a wo, any Ir;np arw! deb n whkh nXCW I o)brr fool Tfaslial,d drbr s< na:x od Darn pel 1 W square ,eel Arts is abed aqua, w the anlrNnl 81 Iflyh d wiS,lld lai+e lm fel pp — Vantljsd s;m nftzs W,ba4er rrn! rn gnrptal, ihrre sllaWG bo+ao ewx3al aNdRAtd of dura+piri4l. KO%iWIS.11d1 Mj+l'MuS dl suit— vmgemtlonwWrhmay lzmxix,s and nixSa4idp —tntariW' cansrline g rr and Id coo," p@rsmnn l or the reproved aceoNMy to appk.tun ptlllke. fkgLUib1�. Nn da+Wd{Ol tia>.i0uy va9atsnnnaM,v GmunlY pnrsonnei or die pubfc uyghl Mrmalty M. Clisaarcdnbnls ami Any Naderxa o{ csviiapels?nF3 ar potauk+l suct= ka.4Pe W5'—or yr om tt Mp ed of potkrtion xs oil, gaw.an, ce. cC� shrW.%or p.^wa bfcahlpg ro aapera'+M rcggatEaa- .s,Ulrce cenbal Bmp. v pteemniud it nvor'w.. Noit/'iam'n Is I pYs9lM ai{+er Fh An�SWlaCe ole h'frl riaWyWrndcm+a+ mVvdxf 10. hrlgtd. IxipM ?w greaw than 6 io-;bes. llbws and Shod! kla Zafd ......................._..._ ^Amr "a m r-byi n leve .rwAreid as tsaxi M A$hword ame6 n I-V'ry "Wial to 'AD and cense prapeal damage Of bveale. Nman Wn. A ha "rd im ldRnllIl" by a qualillod M—Wt must be wmos+sd as soon 3 as poselbw Damaged Limbs or prate of Yeas u shnbs Ihat era sp€1 or Teas W Oivbsw,th lass Ihan 5% &skon WNM aftad —a bion 2$% of !hs k "I ortotal W" With 1W of bfoa n iiydQp of &` V— - $I! -a. SnRtba"t.- b@eli blown dawn IN No t9own down netation IX LT�—��s� �o�, k1*1mU 1W krq>rhM door VCgoialiM, ffee5 or OA"f'" or Fay. Traps a shmM whirSi xo -nae adegp?leay Trsp m shl b In places and - elii wl5d M alb $&a" over. -wMv osposulp a kq..Iey Aupronvo', dead of of bio IamFA dbGd9Cd 110ri: mot d, 3i`3fM-) 35iU4 titsiurr, 51'�w Ili-:Gyr lilawni .11,iwaxlis ,5 k�dh llfs2-svrlprojects\M12025 Renton Salvation Armyl.Design6tormlDrainage Repor0CLIP—Preliminary Drainage Report,docx Salvation Army Renton Corps Expansion, SvR 12025 Section 10.0 Preliminary `technical Information Report Page 37 of 37 July 26, 2012 CONDITIONAL USE PFRMIT PRELIMINARY TIR Western Washington Hydrology Model PROJECT REPORT Project Name: CUP Site Address: 720 S. Tobin St City Benton Report Date 7/20/2012 Gage Seatac Data Start 1948/10/01 Data End 1998/09/30 Precip Scale: 1.00 WWHM3 Version: PREDEVELOPED LAND USE Name I Disturbed Limits Bypass: No Groundwater: No Pervious Land Use Acres C, Lawn, Flat Impervious Land Use ROADS FLAT .03 Acres 0.11 Element Flows To: Surface Interflow Name Disturbed Limits Bypass: No GroundWater: No Pervious Land Use Acres C, Lawn, Flat Impervious Land Use ROADS FLAT .03 Acres 0.11 Element Flows To: Surface Interflow Groundwater Groundwater APPENDIX A 07/26/2012 1 OF 6 CONDITIONAL USE PERMIT PRELIMINARY TIR MITIGATED LAND USE ANALYSIS RESULTS Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.0288`:9 5 year 0.035429 10 year 0.039707 25 year 0.0446 50 year G.G4061 100 year 0.053062 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.028859 5 year 0.035429 10 year 0.039707 25 year 0.04506 50 year 0.049067 100 year 0.053062 Yearly Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 7950 0.030 0.030 1951 0.045 0.045 1952 0.030 0.030 1953 0.025 0.025 1954 0.023 0.023 1955 0.028 0.028 1956 0.029 0.029 1957 0.028 0.028 1958. 0.033 0.033 1959 0.029 0.029 1960 0.022 0.022 1961 0.028 0.028 1962 0.025 0.025 1963 0.025 0.025 1964 0.024 0.024 1965 0.029 0.029 1966 0.025 0.025 1967 0.025 0.025 1968 0.038 0.038 1969 0.043 0.043 1970 0.023 0.023 1971 0.025 0.025 1972 0.024 0.024 1973 0.036 0.036 1974 0.023 0.023 1.975 0.025 0.025 1976 0.034 0.034 1977 0.023 0.023 APPENDIX A 07/26/2012 20F6 CONDITIONAL USE PERMIT PRELIMINARYTIR 1978 O.D29 0.029 1979 0.03"1 0.037 1980 0.036 0.036 1981 0.032 0.032 1982 0.035 0.035 1983 0.048 0.048 1984 0.034 0.034 1985 0.026 0.026 1986 0.024 0.024 1987 0.031 0.031 1988 0.042 0.042 1989 0.020 0.020 1990 0.025 0.025 1991 0.050 0.050 1992 0.046 0.046 1993 0.026 0.026 1994 0.018 0.018 1995 0.021 0.021 1996 0.027 0.027 1997 0.033 0.033 1998 0.031 0.031 1999 0.033 0.033 Ranked Yearly Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.0501 0.0501 2 0.0479 0.0479 3 0.0464 0.0464 4 0.0449 0.0449 5 0.0425 0.0425 6 0.0425 0.0425 7 0.0379 0.0379 8 0.0370 0.0370 9 0.0365 0.0365 10 0.0356 0.0356 11 0.0347 0.034? 12 0.0342 0.0342 13 0.0341 0.0341 14 0.0329 0.0329 15 0.0327 0.0327 16 0.0327 0.0327 17 0.0316 0.0316 18 0.0314 0.0314 19 0.0310 0.0310 20 0.0300 0.0300 21 0.0296 0.0296 22 0.0293 0.0293 23 0.0291 0.0291 24 0.0287 0.0287 25 0.0285 0.0285 26 0.0263 0.0283 27 0.0282 0.0282 28 0.0276 0.0276 29 0.0266 0.0266 30 0.0263 0.0263 APPENDIX A 07/26/2012 3OF6 CONDITIONAL USE PERMIT PRELIMINARY TIR 31 0.026= 0.0261 32 0.0255 0.0255 33 0.0253 0.0253 34 0.0253 0.0253 35 0.0252 0.0252 36 0.0252 0.0252 37 0.0250 0.0250 38 0.0248 0.0248 39 0.0245 0.0245 40 0.0245 0.0245 41 0.0242 0.0242 42 0.0241 0.0241 43 0.0232 0.0232 44 0.0231 0.0231 45 0.0230 0.0230 46 0.0229 0.0229 47 0.0223 0.0223 48 0.0208 0.0208 49 0.0201 0.0201 50 0.0176 0.0176 POC #1 The Facility PASSED The Facility PASSED. Flow(CFS) Predev Dev Percentage Pass/Fail 0.0144 1144 1144 100 Pass 0.014B 1046 1046 100 Pass 0.0151 963 963 100 Pass 0.0155 B90 890 100 Pass 0.0158 825 825 100 Pass 0.0162 760 760 100 Pass 0.0165 708 708 100 Pass 0.0169 658 658 100 Pass 0.0172 607 607 100 Pass 0.0176 568 568 100 Pass 0.0179 525 525 100 Pass 0.0183 489 489 100 Pass 0.0186 453 453 100 Pass 0.0190 424 424 100 Pass 0.0193 404 404 100 Pass 0.0197 362 362 100 Pass 0.0200 342 342 100 Pass 0.0204 324 324 100 Pass 0.0207 292 292 100 Pass 0.0211 272 272 100 Pass 0.0214 251 251 100 Pass 0.0218 233 233 100 Pass 0.0221 217 217 100 Pass 0.0225 208 208 100 Pass 0.0228 191 191 100 Pass 0.0232 179 179 100 Pass 0.0235 170 170 100 Pass 0.0239 15B 158 100 Pass APPENDIX A 07/26/2012 4OF6 CONDITIONAL USE PERMIT APPENDIX A ft PRELIMINARYTIR G.0242 148 148 100 Pass 0.0246 137 137 700 Pass 0.0249 126 126 100 Pass 0.0253 115 115 100 Pass 0.0256 108 108 100 Pass 0.0260 105 105 100 Pass 0.0263 94 94 100 Pass 0.026? 90 90 100 Pass 0.0270 86 86 100 Pass 0.0274 81 B1 100 Pass 0.0277 77 77 100 Pass 0.0261 74 74 100 Pass 0.0284 64 64 100 Pass 0.0288 60 60 100 Pass 0.0291 58 58 100 Pass 0.0295 56 56 100 Pass 0.0298 49 49 100 Pass 0.0302 45 45 100 Pass 0.0305 43 43 100 Pass 0.0309 :39 39 100 Pass 0.0312 38 38 100 Pass 0.0316 35 35 100 Pass 0.0319 32 32 100 Pass 0.0323 31 31 100 Pass 0.0326 31 31 100 Pass 0.0330 28 26 100 Pass 0.0333 28 28 100 Pass 0.0337 27 27 ]00 Pass 0.0340 27 27 100 Pass 0.0344 25 25 100 Pass 0.0347 25 25 100 Pass 0.0351 23 23 100 Pass 0.0354 22 22 100 Pass 0.0358 19 19 100 Pass 0.0361 18 18 1.00 Pass 0.0365 17 17 100 Pass 0.0368 15 15 100 Pass 0.0372 14 14 100 Pass 0.0375 14 14 100 Pass 0.0379 13 13 100 Pass 0.0382 12. 12 100 Pass 0.0386 12 12 100 Pass 0.0389 12 12 100 Pass 0.0393 12 12 100 Pass 0.0396 11 11 100 Pass 0.0400 11 11 100 Pass 0.0403 11 11 100 Pass 0.0407 9 9 100 Pass 0.041.0 9 9 100 Pass 0.0414 9 9 100 Pass 0.0417 9 9 100 Pass 0.0421 9 9 100 Pass 0.0424 9 9 100 Pass 0.0426 7 7 100 Pass 0.0431 7 7 100 Pass 0.0435 7 7 100 Pass 07/26/2012 5OE6 r CONDITIONAL USE PERMIT PRELIMINARY TIR 0.0�:38 6 6 100 Pass 0.0442 6 6 100 Pass 0.0'45 5 100 Pass 0.0449 i OU Pass 0.0`52 4 4 00 Pass 0.0456 3 3 _00 Pass 0.0959 3 3 "100 Pass 0.0963 3 3 100 Pass 0.0466 2 2 i00 Pass 0.0470 2 2 100 Pass 0.0473 2 2 100 Pass 0.0477 2 2 100 Pass 0.0480 1 100 Pass 0.0939 1 100 Pass 0.0487 1 1 100 Pass 0.0491 1 1 100 Pass 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. Perind and Impind Changes No changes have been made. APPENDIX A 07/26/2012 This program and accompanying documentation is provided 'as -is' without warranty of any kind_ The entire risk regarding the performance and results of this program is assumed by the user. Clear Creek Solutions and the Washington State Department of Ecology disclaims 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 and/or the Washington State Department of Ecology be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss c,f nosiness information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions or the Washington State Department of Ecology has been advised of the possibility of such damages. 6 OF 6 N x � CU a m L c cmcc C/3 CL c Oo' /�� W3: O� Y 3 � ■ � Y V i!S c � U � � m 00 1 Ln cc m fA y v a t m e co cc W a y 5 ca � V v NoiionliLSNOO HOS OON rt N d N a a LL uj ui d x �; a t'd. dcv Ln ? o JLL W to z Z 4 W z 7 Q6 m m CL w w Z C D c ? m e OON ....LL t] Zi I m A ] s uj ca J I� 5 3/1N3r1 V SW b'1771M I Ln N L7 W mom �zz mW W I j_ILj- i J ' ze r<�7- L l I C w � w.. j S S1 IGA V 119NYf0 I I I w w� I r,,w ww 0 o w rvl= zoo �cc 0 I