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Green's Landing Short Plat Renton, Washington Preliminary Technical information Report . anu4,r 02, 2018 Pacific En ineering Job No. 15020 PRELIMINARY TECHNICAL INFORMATION REPORT FOR Green's Landing Short Plat RENTON, WASHINGTON January 02, 2ai8 PREPARED FOR Norm & Cynthia Green 105 Harpeth Hills Drive Frankin, TN 37069 Phone: (6 5) 595-4296 E-mail: nwgreen@comcast.net PREPARED BY Pacific Engineering Design, LLC. 15445 53rd Avenue S Seattle, WA 98188 Phone: (205) 431-7970 zv1 & TABLE OF CONTENTS Page 1. PROJECT OVERVIEW..............................................................................3 Figure 1 Technical Information Worksheet to Fallow...................................................4 Figure 2 Site Location Map to Follow.. ............................. ....... ...................... ........... . 5 Figure 3 Drainage Basin, Subbasin and Site Characteristics.......................................6 Figure4 Soils. ......................... ...... ............................................................................7 11. CONDITIONS AND REQUIREMENTS SUMMARY...... ...................................... ....... 8 191. OFF SITE ANALYSIS..............................................................................................15 Task 1 Study Area Definition and Maps.. .......... -- ........................................ ........... 16 Task 2 Resource Review.. ...... — ... - ............ ...... -- ................................................... . 17 Task3 Field Inspection ........................ .... --- ...... -....................................... -........... 18 Task 4 Drainage System Description and Potential Problems ...................................22 Task 5 Mitigation of Existing or Potential Problems...................................................22 1V. FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN... 23 Part A Existing Site Hydrology ................................................... Part B Developed Site Hydrology...... ... —..................................................................25 Part C Performance Standards..................................................................................34 Part ❑ Flaw Control System..................................................................35 Part E Water Quality System .................................................................41 V. CONVEYANCE SYSTEM ANALYSIS AND DESIGN (REVISED 6/26/2012)............66 V1. SPECIAL REPORTS AND STUDIES..... ................................. ...... ........ --68 V1I. OTHER PERMITS................................................................. ........69 Vili. CSWPPP ANALYSIS AND DESIGN. .......... .......... - ... ............. ........ ... 70 1X. BOND QUANTITIES, FACILITY SUMMARIES AND DECLARATION OF COVENANT........................................................................................................... ....... 73 X. OPERATIONS AND MAINTENANCE MANUAL ................................ ........... ........... 74 7 . Prolec _Overview The proposed project is located in the northwest quarter of the northeast quarter of Section 15, Township 23 North, Range 5 East, Willamette Meridian, King County, Washington in the City of Renton, King County parcel number 152305-9219. The site is currently used for single-family residential and is zoned R-8. The surrounding parcels are also single-family residential, zoned R-8 to the west and north, and R-4 to the east and south of the site. The site address is 5998 NE 2nd Street, Renton, WA., 98059. The site is located in the Maplewood Creek Sulo -basin of the Cedar River drainage basin, and the area designated for Flow Control Duration Standard (Forested Conditions), and Basic Water Quality Control. Total area of the site is 1.16 acres before Right of Way dedication and 0.98 acre after Right of Way dedication along Hoquiam Avenue NE. The site is rectangular, approximately 299' x 167* and bordered to the north and west by single- family residences, to the east by Hoquiam Avenue NE (142nd Avenue SE), and to the south by NE 2nd Street (SE 132nd Street). The site is occupied by one single-family residence constructed in 1983 and three outbuildings. The remainder of the property is covered with asphalt and concrete parking grass and trees. All existing buildings will be demolished and removed for the proposed development. The north half of the site is relatively flat, and the site gently slopes southwesterly to NE 2nd Street with maximum slope of 10 to 15% and 10 to 12 feet total vertical relief. other than the existing residence and its driveway and out buildings, the site is covered mainly with grass and trees. The site is underlain by glacial till (Aiderwood gravely sandy loam, AgC) according to King County Soils Map and City of Renton Soils Map, According to the "Pilot infiltration Testing and Subsurface Conditions for Greens Landing' by Riley Group, native onsite soils are silty sand with some gravel and occasional cobbles from 3 to 6 feet below grade. These soils are interpreted to be recessional outwashiweathered lodgment till deposits. Vas hon - age lodgment till was observed from approximately 6 feet to the depth of the exploration, 8 feet below grade. No groundwater was observed. The field measured infiltration rate was 1.8 inches/hour (Small Pit testing method). After applying the safety factors 0.5 (F testing) and 0.8 (F plugging), Final correction factor is 0.40. The long-term design infiltration rate is 0.70 inchlhour. The proposed development will be comprised of 6 single-family residence lots, one Access tract for lots 1-4, and associated paved roadways and half street frontage improvements along NE 2nd Street and Hoquiam Avenue NE. To mitigate potential drainage problems, the proposed development will use flow control BMPs (infiltration and pervious pavement) and include a combined detention/wet vaults designed to the Flow Control Duration Standard (Forested Conditions), and provide Basic Mater Quality Control in accordance with the 2017 City of Renton Surface Water Design Manual. The proposed development will not create negative effects to the downstream drainage system. Figure I Technical Information 'Worksheet to Follow CITY OF REN`fON SURFACE WATER DESIGN MANUAL REFERENCE S-A TECHNICAL INFORMATIONN REPORT (TIR) WORKSHEET Part 1PROJECT OWNER AND.: PROJECT: ENGINEER. .... . Project Owner Norm & Cynthia Green Phone (61 5.).. 595-42 9 Address 105 Harpe to Hills Dr,-ve Frankin, TN_ :37059 Project Engineer ngsazzg Feng Company Paci.f. MC Engire—e .r- Desi n, .;`:c Phone(206) 43-31-7970 Part 3. TYPE µOF�PERM IT APPLICATION.:. 1 0 Land Use (e.g., Subdivision I Short Subd.) —I ® Building (e.g., MfF 1 Commercial 1 FR) ® Grading ❑ Right -of -Way Use ❑ Other Part 2:. PROJECT LOCATION AND....... DE SCRIPTION Project Name oreen=s Landing Short Peat CED Permit # Location Township 23 Range 5 Section 15 Site Address 5008 NE 2nd St;reetr Renton, W-4, 98059 Part 4': OTHER REVIEWS AND PERMITS. L❑ DFW HPA ❑ Shoreline i Management ❑ COE 404 LJ DOE Dam Safety ❑ Sirui Backer aultl LJ FEMA Floodplain LJ ESA Section 7 ' ❑ COE Wetlands ❑ Other 1 Part 5 : PLAN AND. REPORT INFORMATION:::: : Technical Information Report Site Improvement Plan (En9r. Plans) © Full ® Full l Type of Drainage Review ❑ Targeted € Pian Type (check 1 (check one):L)Simplified 'one}: Ll Modified ❑ Large Project ❑ Simplified Date (include revision ❑ Directed Date (include revision dates): dates): l Date of Final: =Date of Final: 2017 City of Benton Surface ,Vater E]esign ivianual 12112'2016 S -A-1 REFERENCE 8: PLAN REVIEW FORMS AND WORKSHEFT TECHNICAL INFORMATION REPORT (TTR) WORKSHEET Part B:. SWOM ADJUSTMENT APPROVALS . Type (circle ane): Standard 1 Blanket Description: (include conditions in T!R Section 2) i Approved Adjustment No. Date of Approval: Part 8. SITE COMMUNITY. AND DRAINAGE BASIN Community Plan: Special District Overlays: King Coun�y Wat er District. 90 Drainage Basin: Maplewood Creek Stormwater Requirements'. Duration Flow Ccnt.ral , Ba5�[: weer Qua1.44.: y ; Part 9 t7NSIifW AND. ADJACENT SENSITIVE AFtlrAS.. ❑ RiveriStream _ ....... _-^ ^ ❑ Steep Slope m LJ Lake ❑ Erosion Hazard ❑ Wetlands ❑ Landslide Hazard ' ❑ Closed depression ❑ Coal Mine Hazard ❑ Floodplain ❑ Seismic Hazard ❑ Other ❑ Habitat Protection Z) NQre 12/1M016 016 2017 City of Renton surface water besign klaaual 8 -A -Z Part 10. SOILS . Soil Type AgC RFFERPNC E 8-A: TECHNICAL INFORMATION REPORT (HR) WORKSHF-P-1' `t'k,CHN[CAL INFORMATION REPORT (TIR) WOI2KSHEE I' Slopes 8 to 15 ❑ High Groundwater Table (within 5 feet) ❑ Sole Source Aquifer ❑ Other ❑ Seeps/Springs ❑ Additional Sheets Attached Part11: DRAINAGE DESIGN LIMITATIONS REFERENCE ® Core 2 – offsite Analysis ❑ Sensitive/Critical Areas ❑ SPA ❑ LID infeasibility ❑ Other ❑ ❑ Additional Sheets Attached Erosion Potential Moderate LIMITATION 1 SITE CONSTRAINT Duration Flow Control., Basic WQ Part 12 TIR SUMMARY SHEET (provide one TER Summary Sheet . per Threshold Discharge Area) mThreshold Discharge Area: Maplewood Creek (name or description) Core Requirements (all 8 apply): Discharge at Natural Location Number of Natural Discharge Locations: 1 Offsite Analysis Level: (Dl 2 1 3 dated: 8/1/2017 Flow Control (include facility Standard: Duration (forest existing cor.di.t.ion) surnmary sheet) or Exemption Number: On-site BMPs: Tnfilt-,.ration, pervious pavernert { Conveyance System Spill containment located at: § Erosion and Sediment Control 1 CSWPP/CESCL/ESC Site Supervisor' be deterzn 'ed Construction Storrnwater Pollution Contact Phone: Prevention ..--- ---- — — - After Hours Phone: -- 2017 City of Renton Surface Water Design Manual 12/12/2016 Ref 8-A-3 ItI;F'I?.R CE E 8: PLAN REVIEW FORMS AND WORKSHEET rECINIC;AL INF'ORMA'HON REPORT (TIR) WORKSHEET 12/12/2016 201.7 City of Renton Surface Water Design Manual 8-A-4 I Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet per Threshold Discharge Area) w Maintenance and Operation Responsibility (circle ane): Private f ublic If Private, Maintenance Log Required: Yes /No _. �...�..................... Financial Guarantees and Liability � .__.. _ Provided: yes)/ No Nater Quality (include facility Type (circle ane):((asic i Sens. lake 1 Enhanced Basic I Bog summary sheet) ---- - — _ _ - - or Exemption No. ------................_----_----------------------- ----- ...� Special Requirements (as applicable): Area Specific Drainage Type- SDO 1 MDC' 1 BP 1 Shared Fac. l ane Requirements Narne: Floodplain/Floodway Delineation Type (circle one): Major I Minor f Exemption 1 an 100 -year Base Flood Elevation (or range): Datura: Flood Protection Facilities Describe: Source Control Describe land use: (commercial f industrial land use) Describe any structural controls: Oil Control High -Use Site: Yes 1 No Treatment BMP: Maintenance Agreement: Yes 1 No with whom? Other Drainage Structures Xiifi-1 ratwion t:rerch w/SrormTech I'hambers Describe: 77.5`L x 22.75';4 x 5.5` Deep infilt-atior trench frith 30 StormTec MC-3500 -hambers and x A1C -33500 end caps in 3 rows. o_ze of the row is .-.sed as :isolauion row - Use a upstream CDS 2015-4 unit £carpare-treatment. and spill oazizrnl. 12/12/2016 201.7 City of Renton Surface Water Design Manual 8-A-4 ItF'FE'RENC:% R -A: `I'I?CHNIC:AL INFORMATION REPORT (FIR) WORKSH.EI-T TECHNICAL INFORMATION REPORT (TIR) WORKSTIFI ' Fart 13 EROSION AND SEDIMENT CONTROL REQUIREMENTS MINIMUM ESC REQUIREMENTS ': MINIMUM ESC REQUIREMENTS I DURING CONSTRUCTION AFTER CONSTRUCTION ❑ Clearing Limits ❑ Stabilize exposed surfaces ® Cover Measures i ❑ Remove and restore Temporary ESC Facilities j ❑ Perimeter Protection j i ® Clean and remove all silt and debris, ensure ❑ Traffic Area Stabilization3 operation of Permanent BMPsIFacilities, restore ❑ Sediment Retention operation of BMPs/Facilities as necessary Flu' '1 and lin /ted ® Flag limits of sensitive areas and Open Space j ❑ Surface Water Collection 1 � preservation areas ❑ Dewatering Control ' ❑ other I ® Dust Control ❑ Flow Control LJShared Facility ❑ Control Pollutants LJ Oil Control ® Protect Existing and Proposed BMPsfFacilities LJ Other ❑ Maintain Protective BMPs f Manage ❑ on-site BMWs Project Part 14: STORMWATER FACILITY DESCRIPTIONS (Note: Include Facility Summary and Sketch) Flow Control I Type/Description Water Quality Type/Description w µ omhined detention/ ] I ❑ Detentions. �:,=t ! ❑ Vegetated Flowpath Flu' '1 and lin /ted i Combined detention/ ❑ ;wet -Vaal ❑ Infiltration ir_filtration Wetpool k LJRegional Facility LJ Filtration LJShared Facility LJ Oil Control ❑ On-site E3MPs CAS 2x15_4 Nn1 &com:Li=:�d Ll Spill Control ; deteait_or.. t. vaLl LJ Other ❑ on-site BMWs j❑ other Part 15. EASIWMENTS1TRACTS T' 15 STRUCTURAL. ANALYSIS . -.... _ m ❑ Drainage Easement ® Cast in Place Vault 0 Covenant ! Ll Retaining Wall ❑ Native Growth Protection Covenant 1 ❑ Rockery > 4' High ❑ Tract ❑ Structural on Steep Slope ❑ other ❑ other 2017 City of Renton Surface Rater Design Manual 12112!2016 Rea 8-A-5 REFERENCE & PLAN REVIEW FORMS AND WORKSHEET TECHNICAL INFORMATION REPORT(11R) WORKSHEET { part 117 SIGNATURE GP PROFErSSIONAL. ENGINEER J E, 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. SignedlDate 121121241.6 2017 City of Renton Surface Fater Design Manual 8-A-6 Figure 2 Site Location Map to Follow ippartment of Community Economic Development ADx P tsch. Adminixtrrlar DaWGIS Analvsis Srruims A,dripmp A. Jlihr n.. Raifitk Fled uin �kpol I,$. WO aib;�di Feel �� 'yav gyral bFCcW �g R -Mn Ir.) UKP, 9a ,nike 61 Atffja,i iu ?e 'a-, wi4!lm N.3T fA1; 49 rimy P.W1 aoidng LU nUt kH]kd 5i VICINITY MAP TiiTig Designations R02d Classification C N Commercial Na:igftkrwho')d — Freeway R14 parcels adaacenl arbrrial!s — PrImary —Mina —Copedof Local rr'r r hl:rCED�F't�nl�r4jwaG�lS�+vj�:5�_�r�m�s City of Renton Print map, Template _ �l Io" 36 D 6B 136 1 we 1W_Mta_Mee�*xlr ALi4li3Fv_S0Peoa :iRe on. iii F•ias;.`nr� ,$c TT Division, Legend City and Gourdy Doundary Y ti I* LrRwim — Dtw Wellhead Protection Area Zorn � znrr. i %.aTa 1 Fiaad�,vti Wftw rMClan Tec hnalow - GIS Trvi rr a b u2w gb"Iulld se s? z+r ?tvn M W,,w rH Mopwa ire r,05 Fier vnllle rdn rase„ OV 4 hr WwwnM c ,y Cl=:w.js a 16M rjnT•n mlyi rugs• a mwp -at hr f2t 1 T fitnrn IS NOT TO M WPM FOR NAVIGATION Uft V x",n svwxeb mitral SUIUCiure Pump Station Disdharga Point 'mater TivaIIty E*Ienlicm Fecllllles TZrk Wftw rMClan Tec hnalow - GIS Trvi rr a b u2w gb"Iulld se s? z+r ?tvn M W,,w rH Mopwa ire r,05 Fier vnllle rdn rase„ OV 4 hr WwwnM c ,y Cl=:w.js a 16M rjnT•n mlyi rugs• a mwp -at hr f2t 1 T fitnrn IS NOT TO M WPM FOR NAVIGATION Figure 3 DrainalZe Basin -Su bbasin and Site Characteristics 1 1 Y ■ s _ l f MW2 J; Location mcp ren � ;4►** /)) � :.,._,�_ nr e , .k7. rte_ � ' •t,:;':. ��^-. I1 � ♦ .. a f R a�` air: • ..� - .. ." � • r f # ►* -N4 07 rr tr;N 1 .......W.... I aeE�Ar it - a.c .p ♦ n • r i a.I S r a - • r"��: -r,. • A'r'm 3 r.y a a - • f a.n r - t12YA yh � MAPi.'�- WOOD r -,r& je 1]to)AJA6)7 FA.Z I � MAP . Maplewood & Orting Hills Suhbasin Conditions Map 20 Cedar Riyer Basin Planning Area °.9 ^ Slrmm & 5treom Ntjmii ,v (E)/= °rvblem Uc, a3ivnjArea L_ocrally 5igniii�nnt Reou:ce Area MWLake'River Areowido Nion, 7Ett Waley as r 5fre�arn In QV43 iiy Fr&'.cis _ Flooding =__: Werlanci & inlaiicnd Numiier Wdcad' Habit; Prcbiem � F Slreern Hvl ilul Prot4r Cr cc- nen, Sosndcry Vi+}i i Cotchmen9 Nu,mbar � Erosii�r/S�i r�nt,.ticx 1v x� r,� 1.N U �' ['1`I° - �a�..-� ........� - - — --- - ... ... ........ _ ...... ................ .... ........... — —- .............................. s:yunix j;el— civil vng7nearinfj R> 'Stou I BY ] DATE I APPR & L rl 20 0 to 20 40 IIIIIIII� G€APHiC SCALE SCALE;T-W N 1/3 CAR SEC - F I), 3' BRASS a 88.22'19' E 2623.96' {city .85T tG 1852 mnas)[hasis ❑f bearings} SURFACE DISH [S 9!;2.2'39" E 262.5.83' -ci-ry record) {SEPT ibo. } 5 8527'13' F 2542.&9' [1/e evr So 5� car] 666,67�]- 18.75' T CITY J1851,5 8S'4fi'a3" a a n NC CDR SEC Fi.lD. 2 1/2" BRASS im � � CM( 1852 7t SS3RFACE GISK - .o ea FhiG. 3" BRASS {SEPT 2G07} m SURFACE DISK 86126' k 88'23'95• W {Scp" 2007}3 i � S 8a'24, 6" � S M ss7-ss' a n � ? 4 w N V � 661.85 _ 1323.69' 3 at b � G6 F.85' N 88'25'16" 5Y r v 6 Ex- CTR 'OF SEC. to FNI3, CDNC MON in CASE (SEPT 2007) 863.G2'X1326.04' 2652.08' .... SE-CWNBFt AIC DOWN we 5 Ei t . s35' r�sW MAP ".11' GI -FY OF' _RENTON O TU41 srx .oaR.ra. Plcnning/8uilding/Public Works Dept, IN COMPLIANCE WITH CITY OF RFNTON STAM)ARDS GREEN'S LANDINGA SHORT PLAT EXISTING CONDITIONS 12--04-201 U 1. rL ii 0 z .J LU Lit T- Q) Figure 4 Sniffs ZQil Map—�Kirjg Caunty Afes, Washlngtan .9 k LA m 6:&� saffim SEW P4X,.5*7Aa! JAM Vpttc!dw A pub-&M7x lrpgmi!t -Md= N 0 io 2D A0 25 m ED Im PW p4mbT, W16M&-,�Xw C,:)IW O-ffb-M WU634 Edpda-1 LFrM &- 10NIVES34 Nahiral Reawreas VWb Soil:Surmy CoinservatiatiService Na6lorial Cacgerathm Soil Skmwv 47 277 M I MT201 7 Page 1 of r Tog -13 '43-31 - o L! A_ v, e! a E EN .74 a' 0 �� ^ cm � 's rLo �� ` m � M C13 ffl 'S Ar C r4. r - .0m CL 4A Z,m' �+ r o a. U. � IL q1 5 c g 'E W ui E —C i CLm vo a �a baa � a 07 � }g�`e SP = 'rs 4o a n Q T t m AL ■ IL *y `u � 41113 L _ nn :A T luM 4 � ` 6 it 3 n 4 C:L w fl a c �- n 7 2-, u W m a o n nn r r a nS m mu a s 60 w2 43 CA Co L Sbi Usp-4Gq Cburrlye Atom, Was hIngAcc Map Unit Legend Map Unit Symbol AqC Tutsis for Ares of Intores i File Cqunhf ,arca, Washingion (WAS331 Map Unit Nam Acres in AO[ percer7t of ASI Alderwood gre,relly eandy i.2 1{5D_G% Mm, 8 to 15 peroerrl slopes. W*Wral R;emurom vwlb iI Sannag =12017 cdemervallom Service iV,ricvr l C oppora ;Spi SUivey pago 3 of 3 IL Conditions and Requirements Summa CORE REQUIREMENTS - SECTION 1.2 OF KCSWDM 1.2.1 CORE REQUIREMENT #1: Discharge at the Natural Location Under existing condition, the site sheet flows southwesterly to a drainage ditch that runs along the north side of NE 2nd Street. Same drainage pattern will remain under developed condition. Treated runoffs from the onsite development and the offsite development along the west side of Hoquiam Avenue NE and bypassed runoff from the offsite development along the north side of NE 2nd Street all will be discharged to the same ditch that runs along the north side of NE 2nd Street, 1.2.2 CORE REQUIREMENT #2: Off-site Analysis This core requirement has been addressed in Section III of this report. 1.2.3. CORE REQUIREMENT #3. Flow Control Per SWDM section 1.2.3.3 and 5.2, Flow Control BMPs are required for the onsite development. See 1.2.9 CORE REQUIREMENT #9 of this report for Flow Control BMPs. A combined detention/wet vault is used to provide the required Duration standard forested site conditions flow control. Approximately half of the vault is located onsite and the other half of it is located offsite in the NE 2nd Street Right of Way because this vault treats runoff from both onsite (lots 5-5) and offsite (Hoquiam Avenue SE and NE 211d Street). Due to topography and existing drainage improvements, portion of the off-site improvements along the north side of NE 2nd Street do not drain onto the site and will not be connect to the combined detention/wet vault. The vault is oversized to counter the effect of this bypassed area, so that at the point of compliance (POC), the Duration Flow Control standard is met. 1.2.4 CORE REQUIREMENT #4. Conveyance System The new conveyance piping will be installed as needed. The new conveyance piping has been checked to confirm compliance with chapter 4 of the 2017 Renton SWDM. Per City of Renton 2917 SWDM Section 1.2.4.1: 1. New pipe system shall be designed with sufficient capacity to convey and contain (at the minimum) the 25 -year peak flow with minimum 5 inches of free board, assuming developed conditions for onsite tributary areas and existing conditions for any offsite tributary areas. 2. Pipe system structures may overtop for runoff that exceed the 25 -year design capacity, provided the overflow from a 1 00 -year runoff event does not create or aggravate a severe flooding problem or severe erosion problem as described in Core Requirement #2. Any overflow occurring onsite for runoff events up to and including the 190 -year event must discharge at the natural location for the project site. In residential subdivision, this overflow must be contained within an onsite drainage easement, tract, covenant, or public rig ht -of -way. 3. The upstream end of a pipe system that receives runoff from an open drainage feature (pond, ditch, etc.) shall be analyzed as a culvert. The new conveyance system is designed to convey and contain the 25 -year peak flow with 6 inches of free board and the 100 -year peak flow and thus meets the requirements listed above. KCBW is used for Back water analysis following the requirements of City of Renton 2017 SWDM 4.2.1.2 and designed for the '100 -year peak flow. 1.2.5 CORE REQUIREMENT #5: Erosion and Sediment Control Erosion control will be installed as necessary for the frontage improvements and the on- site improvements. 1.2.6 CORE REQUIREMENT #6: Maintenance and Operations Any necessary maintenance of the onsite drainage system will be the responsibility of the property owner and manager. The combined detention/wet vault will be maintained by City of Renton after the two -years warranty period. 1.2.7 CURE REQUIREMENT #7: Bonds and Liability Necessary bonds will be provided at the time the building permit plans are approved and the construction started. 128 CURE REQUIREMENT #8: Water Quality The project site includes onsite improvement and frontage improvement (curb, gutter, sidewalk, planter strip) along both Hoquiam Avenue NE and NE 2�d Street. A combined detention/wet vault is used to provide the required Basic water quality treatment for the onsite improvement and the offsite improvement. Total pollution generating area in the bypassed area is 941 square feet and is counted as untreated discharge per 2017 Renton SWDM Section 1.2.8.2. D., no water quality treatment facility is required for this bypassed area. 12.9 CORE REQUIREMENT #9: Flow Control BMPs Flow control BMPs such as infiltrations and pervious pavements are used in this project to meet the Small lot BMP requirements per Section 1.2.9.2.1 and the Small subdivision project BMP requirements per Section 1.2.9.3.1 of the RSWDM. BMPs need to be applied in the order of preference per Section 1.2.9.2.1 to the maximum extent feasible. After all the BMPs are applied to the maximum extent feasible, then BMPs need to be implemented as described in number 5 in Section 1.2.9.2.2 of the 2017 RSWDM. SPECIAL REQUIREMENTS — SECTION 1.3 OF KCSWDM 1.3.1 Special Requirement #1: Other Adopted Area Specific Requirements No other area specific requirements are applicable. The site is not within a GDA, MDP, BP, SCP: SWCP, LMP, FHRPU or SFDP. 1.3.2 Special Requirement #2: Flood Plain 1 Floodway Delineation Not applicable to this site. There is no flood hazard area in the site. The site is not within a floodplain or ffoodway. The site is not subject to inundation by the base flood or channel migration. 1.3.3 Special Requirement #3: Flood Protection Facilities Not applicable to this site. There is no flood hazard area in the site. The site does not rely on any flood protection measures. 1.3.4 Special Requirement #4: Source Controls This project is a single family short plat project. Source Controls are not required. 1.3.5 Special Requirement #5: ail Control This project is a single family short plat project in Rm8 zone and this site is not a high used site. Oil Control is not required. City of Renton Special Requirement #6: Aquifer Protection Area Not applicable to this site. The site is not located in the Aquifer Protection Areas (zone1, zone 1 modified and zone 2) shown on the City of Renton Aquifer Protection Zones Map. I. Off Site Anayss Task 1 Study Area Definition and Ma s GENERAL INFORMATION This Level 1 Drainage Analysis was prepared in accordance with the City of Renton Surface Water Design Manual. The proposed project is located in a portion of the Northwest quarter of the northeast quarter of Section 15, Township 23 North: Range 5 East, Willamette Meridian, King County: Washington. The site is located in the jurisdiction of the City of Renton. Zoning for the area is R-8. The site is located in the Maplewood Creek Subbasin of the Cedar River Basin. The parcel number of the site is 152305-9219. Total area of the site is 1.15 acres before Right of Way dedication and 0.98 acre after Right of Right dedication along Hoquiam Avenue NE. The site is bordered to the north by an undeveloped parcel, to the east by Hoquiam Avenue NE (142nd Avenue SE) and to the west by single family residences, and to the south by NE 2nd Street (SE 132nd Street). There is an existing single-family residence with several outbuildings in the site. The address of the existing residence is 5008 NE 2nd Street, Renton, WA 98059. The residence was built in 1983. The existing structures will be removed to make way for the proposed development. The high point of the site is located near the northeast property comer. Area north of the site drains northwesterly away from the site. Area east of the site drains southerly to the drainage ditch along the north side of NE 2r'd Street and is collected by a catch basin at the northeast corner of the intersection between NE 2nd Street and Hoquiam Avenue NE and then drains to the storm pipe system along the east side of Hoquiam Avenue NE. Nearly no upstream area drains to the site. The existing residence in the site is located at the high ground of the site. Area around the existing residence is relatively flat. The site gently slopes southwesterly to NE 2nd Street with maximum slope of 10 to 15% and 10 to 12 feet total vertical relief. Other than the existing residence and its driveway and out buildings: the site is covered mainly with grass and sparse trees. The site is underlain by glacial till (Alderwood gravely sandy loam, AgC) according to the Geotechnical report prepared by Earth Solutions Northwest, LLC. Erosion potential in the site is relatively low according to the geotechnical report. The proposed development will be comprised of 0 single-family residence lots, one Access tract, and associated paved roadways and half street frontage improvements along NE 2nd Street and Hoquiam Avenue NE. In order to mitigate potential drainage problems, the proposed development will include Flow control BMPs, a combined detention/wet vault designed to provide Level 2 detention and Basic water quality treatment. The storm facilities will be designed following the 2017 City of Renton Surface Water Design Manual. The proposed development will not create negative effects to the downstream drainage system. See attached Site Map and Topographical Map. 16 Task 2 Resource Review The following resources have been reviewed for existing /potential problems in the study area. ) Critical Drainage Area maps Do not apply in the City of Renton per City of Renton Surface Water Design Manual. The project site is not in any sensitive area shown in the City of Renton or King County Sensitive Area Maps. 2} DNRP Drainage complaints and studies None. 3) Road drainage problems See description of downstream drainage system (King County) in 154th Avenue SE in Task 3 _.. Field Inspection. 4) U.S. Department of Agriculture, King County Soils Survey The King County Sails Surrey map and City of Renton Soils Map show Alderwood soil on the site (AgC). See attached Soils map. 5) Wetland Inventory There is no wetland on the site and its adjacent areas. 6} Migrating river studies There is no migrating river within the study area. 17 Task 3 Field Inspection Upstream Tributary Area Basest on the general neighborhood layout and topography, there are no significant upstream flows that enter the site. Upstream runoff to the east is intercepted by the existing conveyance system (CBs and underground pipes on the east side of the street) in Hoquiam Avenue NE and conveyed south bypass the project site. Upstream runoff to the north is intercepted by the existing conveyance system (CBs and underground pipe) in NE 2nd Place and conveyed west bypass the project site toward Maplewood Creek. The north adjacent properties sheet flows southwesterly to Maplewood Creek. Downstream Analysis Surface runoff from the site currently travels overland in a southwesterly direction toward NE 2nd Street. There are drainage ditches and culverts that runs along both sides of NE 2r° Street. The street drainage system drains westerly to Maplewood Creek approximately 240' downstream of southwest corner of the site. A field visits were completed on August 1, 2017 (Weather was sunny). East of Hoquiam Avenue NE, the north half of NE 2nd Street with curb and gutter and sidewalk drains to a catch basin at the northeast corner of the intersection of NE 2' Street and Hoquiam Avenue NE and discharged to a detention/wet pond located at the northeast corner of the intersection. The outfall of the pond is discharged to a storm pipe system that runs southerly along the east side of Hoquiam Avenue NE: thus, no offsite runoff drains to the site. The north ditch of NE 2nd Street along the frontage of the site is a grass lined earth ditch. The ditch is approximately 2' wide at the bottom, 1.5' to 2' deep with 3:1 side slope at both sides. The field inspection starts from the north road side ditch along the NE 2"d Street at the southwest corner of the site (the site discharge point station 0+00'). At this location, a 12" LCPE culvert cross under the driveway to parcel 1523059218. Downstream this culvert, the ditch is lined with gravel for approximately 200 feet all the way to an 18" concrete culvert Oat station 2+333 that drains southerly across NE 2"d Street to a catch basin at the south side of the street (at station 2+73'). This catch basin also picks up runoff from the south road side ditch (one 18" concrete pipe comes in from the north, one 12" concrete pipe comes in from the east, one 12" concrete pipe comes in from the west and one 18" concrete pipe runs out to the south). Downstream from this catch basin, an 18" concrete storm drains through a drainage easement in properties of Puget Colony Homes to a catch basin in the north side of SE NE 1 st Court (at station 5+00). From there, the 18" concrete storms drain easterly to another catch basin at the north side of NE 1St Court (at station 5-A70'), then drains southerly across NE 161 Court to a catch basin at the south side of the street (at station 6+20') and drains through another drainage easement in the properties of Puget Colony Homes to a drainage swale in parcel 6928000290. Parcels 692800-0290 and -0280 are undeveloped and are covered with forest. 18 The swale is approximately 6' to 8' wide at the bottom, 2' to 3' deep with approximately 3:1 side slopes at both sides and is covered with native vegetations. At the south end of the swale, a 36" LCPE storm (at station 9+20' with trash barrier at the inlet) picks runoff from the Swale and drains to a catch basin at the south side of SE 134th Street (at station 9+70'). This catch basin also collects runoff from a storm pipe system that runs along Field Avenue NE (1401' Avenue SE). Downstream from this catch basin, a 36" storm pipe system runs easterly to 142"d Avenue SE (Hoquiam Avenue NE) and then runs southerly along 142nd Avenue SE to the east fork Maplewood Creek south of SE 2"d Place (at station 19+30'). West of the 36" GMP outlet to Maplewood Creek, there is a 12" LCPE outlet that discharges runoff from south road side ditch of SE 2"d Place (SE 1361h Street). East of the 36" CMP outlet, there is a 48" CMP outlet and a 12" ductile iron outlet to the Creek. Both the 48" CHIP and 36" CMP outlets are protected with trash barriers and there is a riprap pad downstream of these outlets. There is a detention pond at the northeast corner of the intersection of SE 2nd Place and 142 Avenue SE, parallel with the pond, along the east side of 142"d Avenue SE from SE 2"d Street to SE 2nd Place, there is a drainage swale running parallel with the existing 36" storm. The Swale is approximately 6' to 8' wide at the bottom, 4' to 5' deep, with 3:1 side slopes at both sides and rock check dams at approximately 50' o.c. This Swale appears to be a biofiltration Swale. The detention pond and the Swale are part of the drainage system for the development in the Black Loam Five -Acre Tracts. At the south end of this Swale, a 48" CMP culvert (with trash barrier at the inlet) connects to a catch basin with a 48" CMP outfall culvert to the Maplewood Creek. From this point downstream, the Maplewood Creek is approximately 10' to 20' wide at the bottom, with approximately 3:1 side slopes at both sides and covered with forest and under brushes. The Creek is approximately 5' to 6' deep near the two outlets mentioned above, and gradually changes to a more than 50' deep ravine approximately 1000' downstream. The 0.25 -mile downstream point is located near the intersection of SE 135th Street and 142nd Avenue SE. The 18" concrete culvert at NE 2nd Street and its downstream storm pipe system are part of the drainage system of the east fork Maplewood Creek. See the following Off-site Analysis Drainage System Table for the downstream drainage system within 4.25 mile downstream of the site. Other than some sediments at the inlets and outlets of the 12" culverts under driveways to the single-family properties at the north side of NE 2nStreet, no sign of erosion nor capacity problem was found in the 0.25 -mile long downstream study. 19 I LS 20 `t � .i,.. _ "� ra 0 0 m r•– r;i w w a,l� � � — cn .� � � � ry � r,� }'� is �i G ;a Ti � f� tryi �" n c y+ xi 5-2 2 s5 a a a v VI `n � G W 3y W d � � w ❑ a ry ❑ a rJ • � � :» � µy fi O o o � O pOp �Q�++ yRy�� q4 5b� yO� a o a ,�; o a o 0 o u o a a o 0 ❑ 2 � •r; �r cin � u o r�J o n a a a o n ❑ o ❑ o ❑ CL SE - al w d e� 3❑Y F'. Yom! KI {S U p q # � G � G ❑ ❑ 6 L] ❑ 4 ❑ iS i7 6 in p .� ��3 + {�• r f rq rx -r a as cn ❑ti c7 C q p t7 « C] C] q Ca C] sy] iT Ol 431 '© F� ">•.��+ m ... .. 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The proposal south combined dctcntIon'}ket - vault will be discharged to this ditch. I°lalf .std improvement with street widen1np,, curb and gutter, sidewalk will be installed along the fruntap of tht� site" This 12" culvert -Mll bu removed and repla d to lin4--up with the neva catch basin at the edge of the new curb and gutter. PACIFIC ENGINEERING DESIGNt LLC 15445 5 �- AVE.S . r Seattle, WA. a#100 9818th R2a6j 431-7,970 WW .Vaeen Green's LaTid nShort Plat DOWrrstream 5008 NE 2'16 Street Renton, WA 98059 :i[`ALIE: NrAe DATE, 8�*0 L-201 SHEET: 3 OF 14 ,TOB NUMBERz FILE NAME: ply: j 1.50211 152ffhotohase. DOWNSTREAM CONDITIONS l'o 1 ra B: Outlet L)I' 12 1 (I'L (`,,-,1 ) cu I -,.-crk Under drivcwky tu the wc:.sl mijaceol El:x Hperty. PACIFIC ENGIMEERING DESIGNr LLC 15445 531& AVE, $,, 0100 SgaVUSr WA, 98188 (206) 431-79.70 wv,-vv.p,qceg&.com (i rQen's I and ng Short Plat Downstrewn 5008 NE ®1 Street Renton, WA 98059 SCALE. Nmw DATE: &D L I 7 SHEET, 4 OF 14 JOB KUMBER! FILF NAME: KY: JlF 15020 1520Phcw.bose DOWNSTREAM CONDITIONS I loi nt F! 19 inch concrete culvert at the. no side of NE 2" Street at the crossing of Maplewood Creek_ DESIGNr LLC 15445 5350 AVE, S. , #100 S*attle, WA, 98188 (206) 431-79710 ,A-,,'w.paqeng.cgm IL I loi nt F! 19 inch concrete culvert at the. no side of NE 2" Street at the crossing of Maplewood Creek_ DESIGNr LLC 15445 5350 AVE, S. , #100 S*attle, WA, 98188 (206) 431-79710 ,A-,,'w.paqeng.cgm Green's Landing S h or Plat Down,%tream 5008 NJ: 2`1 Strect Renton, WA 98059 SCALE: Nwe DATE: VD V201 MEAX: 7 OF 14 7 .IOC NUMBER: FILE NAME: By: JI.. I L50 1 1,520howbasc DOWNSTRE AM CONDITIONS Point F. Catch basin and drainage arch along the smuth side of CJS; 2"d Street at the -crossing of Mapl ewaod Creek- The catch basin has two 12" concrete inlet. pipes from the east and west, one 1 " con,=Le anlet pGpe from the na(6 Lam. rine 18" outlet pipe to the south. PACIFIC ENGINEERING DESIGN, JLC 1.5445 53RD AVE- S_ r #100 Seattle, 1im_ 98188 (205) 431-7970 w , ,.y, paCL1,.Ftg.00M Green"s Landing Shon. Plat Downstream 5008 NE 2114L t,1eet Renton, WA 98059 SCALE: None D TIE: VU 1,-,N)L ti.E3F:ET: 8 f 14 A113 NUMBER: FILL NAME- Bv: IF 1502U L { 2upholobose DOWNSTREAM CONDITIONS Drainage ditch slang th-c wuthsidt- of NE 11 Court tiear the crossing of Maplewood Crock. PACIFIC ENGINE.ERTNIG DES IGN 15448 53--p AVE, S.. 4100 Seattle, WA- 98169 (206) 4 1-7970 %%.'W-L�acen. gxom Green's Lan di ng IN hurt PI at Down 5008 NE, TO Street Reriton, WA 98059 R,,'011201 5',CALIK: DATE: S11 ELT: 10 OF 14 7 JOB NIINTBER: Fl IX NAKE 15020 1 52OPhatobase IV. Flow Control and Water Quality Facility Analysis and Design 24 Part A Existing Site Hydrology Duration standard forested site conditions flog control requires matching developed flow duration from 50% of pre -developed 2 -year peak to full 50 -year peak. Existing site condition is forest condition per City of Renton Flow Control Application Map. Scale factor = 1.00 (Seatac) Total project site area = 1.28 acres (assume till forest, soil group C) 25 LOT 3 To MAVLZ W0417 C,Tz z- €C I 10 L. r C, �, i 1 E MAI NA &rE ARG A= 1 t� 8 A (A551AM 'TILL, FO[Za6 20 0 10 4 4* GRAPHO SCALE SCALE r -W N 3 j4 Cilft SEC, FND. 5' BRASS S 86.22'19" E 2023.96' (zl:y 185: t0 1852 meos}(�acsis n€ 6eoiin9s] SURFACE DISK (S 88'22'•.9" E 2621.83' -city remrd] (SEPT 2907) S 88'21'13" E 2+33259' {7 /4 ca;• to sac cnr] 6GFt.B7' S5f3.67 :32:.34' Sc.R CITY B51 n j NE CAR 5s:5"C FND. 2 3/2" 8rZA55 I mI Cl!Y las, SURFACE DISK ^ w FND.ORA$$ {SEPT 2007} •.a ' SURFACE. DISK 661-2..6 1t 68"23'35' 4Y (SEPT 20a7j n1 ss 4.zs' �3 � �S 88'26'38" � - � _ 1325,111, w 3 563.85'^ N 88'25'56" N' a r] � �I I� IIII[j EX. CTR OF SEC. I ND, CONC VON IN CASE (SEPT 23707) s63TU2�83y2� �332E.a4' S 8&'29'T9" E 2652.G6' r.. " Pacific ..•.Y,� [ � I� , {' Civil kslgirlaerlr�] : i a og 86g a 8ss�s j17 NO. W 3.-2� CITY OF 133+ "'' RENMN �APPR-w' • DET l -'. - Picnn3ng/IIuffLfny/Pu&fc Wo. t] Oept. RF.Vi51D!7 UM 13Y DATE l S 88'7.5 1 5" c ar--QR BA ..AK DOWN w........ NM— r -l----- IN COMPLIANCE WITH CITY OF RENT -ON STANDARDS GREEN'$ LAWNC SHORT PLAT FASTING COMMONS 12-,D4-205 i U 11. 0- t13 C� z 0 z Q LU w I� 1 PerviousTntdl 12B _ a Aces Ir.• QeMfAn Totalp :. -www Rues:: 9asin YOU Ac[es.: Sale cl By. F77777 aG 26 i C1amulaUve Probaf3ility i t i s r � ++ J v5 1 2 5 10 20 30 50 70, Sg 5:: 55 53 93 59.51 5:rea n PnDlectmn Cosaticn UD Ocratiw E O;N FreEjuency € Water QualiEy u HlyJrayrapl� w M Wetland i.harge Predevelme 3TRecharge M'igad l ndbjze d&aaets Lomp�:t WDM j 701 Nov P©G T Hifigated:r:. 7023rdlow.ta P©C 2.m 16*ated 703 3 r&w to P©C 3 Mitigated. $o1 POCI ki igated Nowa B02 POC 2 Wg tad iicvo.: W3 POC 3 Mitigated llavi.`: A Datasets Flew _Stage Precip vap f'c C 7 P9C 2 POC 3 _ [ iu.. . i� Fruency hte€had a%. Lag Pearson Type IEi 1 i6 .':: At point of compliance at the drai Part B Developed Site Hydrology North basin Total drainage area = 0.62 acres (lots 1-4, access tract for lots 1-4 and the west half the right of way of Hoquiam Avenue NE along the frontage of the site north of the access tract for lots 1-4, this area will be collected and conveyed to the north combined detention/wet vault) Asphalt pavement for Hoquiam Ave NE = 0.04 acres Sidewalk for Hoquiam Ave NE = 0.01 acres Shared and private driveways for lots 1-4 = 0.06 acres Roof area for lots 1-4 = 0.20 acres Total impervious area = 0.31 acres Total pervious area = 0.62 — 0.31 = 0.31 acres (till grass, soil group C) South basin Total drainage area = 0.621 acres (lots 5-6, Storm Facility Tract and the west half of the right of way of Hoquiam Avenue NE and the east portion of the north half of the right of way of NE 21d Street along the frontage of the site south of the access tract for lots 1-4. this area will be collected and conveyed to the south combined detention/wet vault) Asphalt pavement for Hoquiam Ave NE and NE 2nd Street = 0.147 acres Sidewalk for Hoquiam Ave NE and NE 2nd Street = 0.08 acres Private driveways for lots 5-6 and Storm Facility Tract = 0.03 acres Roof area for Iots 5-6 = 0.114 acres Total impervious area = 0.371 acres Total pervious area = 0.621 — 0.371 = 0.250 acres (till grass, soil group C) Bypassed basin Total disturbed area = 0.039 acres (this area will be collected and conveyed to the existing storm drainage system that runs along the north side of NE 2nd Street and bypass the south combined detention/wet vault) Asphalt pavement for NE 2nd Street = 0.022 acres Sidewalk for NE 2nd Street = 0.010 acres Total impervious area = 0.032 acres Total pervious area = 0.039 — 0.032 = 0.007 acres (till grass, group C) 28 `Tv'Tr—r--c(RINEQT TO i�L ' ��G f s 1 L 1 EXSS=3NG PITC;€ ... ... ......... .. ... .............. .. .... .......... SEE NOTE AT LEFT N ! WET VAISL v • CUfY}91 N>wq pETE1tTfO T �r� [ COMWNED DTcTr.bFTION! WET VAULT i 4 CEI #: ('YPE '.} . - ,. ?RE= To R_MAsN ( j [44'L x 27'W]�.- SPS14.EET :'D5 FOR Dc!AILS 19,7 YEAR DET%N TION WATER SURFACE FL. = 4-81.50 1 m i TOP We EL = 397.50 € .�•-1__- it CB q+:s {TYYt']: - BOTTOM W4 EL = 393.50Tq -- ==i �•'; ICU 5 26i '-• ) f I 4 REQUIRED DrTEN-50N LIVE STORAGE - 4,660 OF { APPROVED E4VFALEN' - PRDVIDFD OrT.ENTiON ! %VE STORAGE - 4,752 CF' 1 .:. ..• _- .. ....___ I _ F[]R PRF-TREATR€ENT REQUIRED Yt4 �JF.Ap STORAGE = 2,065 LF f [!) + /1 N6 AT RiGFE7_ a, : Y i TlLIIC7' B SrUR A R s 1 �' DRIPILWE TYP PRDMDED WO DEAD STORAGE _ -752 CF ; ^[ —i• /�I----'-I { ] I INV. 5" {SE. NQ = 33$ -OG I : �. - 6,938 3 LOT 2 i _.-•. tll $ NEw- s':........... s cr31 1s x z9s- Lf3i 3 ......t........ a ❑ zo ,o INV. (12' SE = 3a8.0D .. .__s,y oa ... .... .. ...... za o t ) ..... .. .. U]:...: ..i ... `S.@3F..SF.... ... .� .. .. I.... .. g.879. 5F. .. .- 1 1 jm7j I.... ._______________ ,$Ti]RA1 (Tl'P} ...... .... '.. .. f.. iI/ }-- 12" Fi.CJW Cp?iTROL RISER OVERFLOW EL. = 401.5U " > ` r ._ I Hm #14 {TvrE ;) ENV, 12" OUT (SW) = SW 50 - - ---- --- o CFI. O12 (TYPE I) � t, BOTTOM OR;FWX EL. 395,50 Cii?Ai'hUC SCAT - 60TTOM ORIPC£ i3IA.-- }--- 2ND ORIFICE 4" ELaOIN EL 398.94 z . r•'] ss.:�� �� "s 25' PRIVATE STORM t-� ---- SCALE-- I -W J ( 2ND ORIFICE D3A. .. ENT. -7 INFILTRATION SYSTEM C8 g2 (TYPE I) r� ,n STORM V^,H MC --3500 D _ •-NEYt 6" ` LEAN CRUSHED, ANGEJLAR STONE HFD 517.E ... .............. ... ... ................... ... .. ................ ... ... ...... I :.. ..--�412� F �_ -. --- -- E ... a. - ---`CB #'.5 (rYP£ I] :!77.5'L X 7.2.75'W X 5.5'H] W/ TOTAL 3G C:-iAM9fR5. x C� I;_! ... ,, •• ._ ...�....� �............_-_....,....._ ._ sl.2a '7F �, S 63rD CAPS. 3 ROWS - 9hE: iSD:.ATIR`i ROW, TWO SPUR TrPj [ 4:.cc - - - --- --' --• ......- •-•- -- - :NEIL}ii D CHftiA8ER5. CR ,�'3 {Trr'E I}f • ' •.:' S r- - .,• - - - SEE SHEET P46, P97 FOR DEMLS ? C$ #11 [TYPE?] ; , ��--OF- ACCESS ROAD! I ] I TOTAL ME S3ORAGE REWIRED = 4.968 Cr :I TOTAL LIVE STORAGE PROMDED = 5,9'9 CF n =--------------- 3 -:- i SY5TEAi OVERFLEW EL, 432-75 i 5,384 SF N 5.613 EF w 2 TION SAW' -U-- EX. ASPHALT PAVEMENT (':YP)cl) i ..� I I I ��•� I .•�I � e.rir I }� ALL 1 L }y7I �77�� III[ j rx x H21 Lf E(SSEEE. DesA as9TsF �i s,s❑4 ��JT� Q�I�E �u�[� AREA �!�•�jzAG. 11J � i 1 - c n kTlFil3RAi7i3!! 5Y87±ch9 �n [ �7 �7 ane j k CL] -a... .; § j jll ET - 45 TYP) F E_ N0� =I.ES Sr-EET 7 . --FOP ^ FL OW COA) S i� L.. E:.J SH= 3 C9 #1D {TYP' I� i [ s5 t�» t , � i .. C 0; T E I TO #M►l�t� ( �� (TY10#,� fP= IIi " -� o P Q ,A� ` — — ---_---1 — G Jf17 (TYPE i�L» {� - k �Yi�SM1 7��F J i4 ca o _-- -- _' TOTAL v 4 .. -max } ,z i [ t 1/ oK - f - E vt �k416 At . i' R i S AES _ - 1 i 7 T33'E I ) �{ sTA, D+04: (NE:2ND STREET) � ] ; � E D � � �a �s >�E 1 -...�. I�7A{{E -TO-TAL i ) � i O iL l- u 1 � .� STA 5+•C0 (H04VlAM AVE NE} .. .. r ^ nx5'ns' w •� r • � T � ---- -- - -- . .....- ..... .. - ............................... .. ............3 } .............................-...-.......-.....-.— .. ............................... s. - I w AtL.(Z 5, = s �7 0101ilz Ac, �r . C �, VOL) � ai � kNF[LTftATiDfJ i j � I I I I I i.. H0.01 JIAM AVENUE N.E. P R� vi4TL . � 7kiNC}k #7 {SEE O�AIL.. ,.. L t .: .. L -1 . y� 1 R (PiTRi ACCESS) L'� 1..t� ..:-..-. sHEer P9s TTP. - � � g .............. i vv 1 ov& FLAW PA`il- TO 6,04 T n u t _ ,' 13A9" VA u IST: -T RSAT NT D&FO E AFF z -y FL-tiW Nlfko L ` 13MCR.8r V TA L n- t n AG ['07AL. ! r'IRVI o cs t` p 7 }F c • LEGEND i�b CDS zu 15 q 1P'T FOR -rL'?-TALrZr�V1Vu.s A� F'm� ` F9 lzv t a lk5 pAV"CxnSv� PRY5 U�wD AwD VALA-� k66,-&�5 P�v�w�? ���� wAy 6 TD-rlkL iM f&t:�,Vi DV6 AKi;-A� 0, 311 AG, IRE jr 9 �� Cn 1 N� � � E c NT I C>Ai / �- V L veVIELOrM\5 CONDITION T�N/Ac-q2:. &AS ( AJ OAP ON As FIQ TREA c MT - IJ t U?>Tiz a -AM dY lNFtL-TRA7 [ a#U IN COMPLIANCE WITH CITY of RENTON STANDARDS m 0 0 z "., • � 3 3�. IJ ]3.1=�_'..r.�'.; r �% .C'l., rur�t;rF 7.=20, : -i >a. +�, e�"� L T� OF GREENS LANDING SHORT PLAT fl. Lym r I- ON 8 OA1 V 41 er",_' ' s ' Planrin)/RLAWinq/Pvhlic Wark� oP�r. PREUM[NARY GRAD]NG AND DRAINAGE PLAN LuLH -. Civil-nyinc�rr�+� n ps, �. FiHr, r :: •. � Plannir�� Cars�i:f±-r�: 3 I! �S N6- R£VISTVN BY PATr APPR 4, F'niB SCENARIPS..:. `. L s ssed 29 u._..:.......,:.....�..w� �.... ...... Subbasin Name_ Ndrt 'l3asiri': ::'' i': '>:. `;:'`- ` f bognate as Bypass for: POC: Surface Interflaw Groundwater Flows Te _ 3'':` .......; ...::.f7kc:' :::`:::: ;`"::`; ; ': ` >:i'`--:; Area in Basin ;thaw f�r�!}� Seleci�d ` Available Pervious Acres Available Impervious Acres C O 1 T:.:::.::::.:..:.;:::: I� Ai3S FW . .. .: ROOF TOPS/FLAT SIDEWALKSIF�T...`::.; 30 Available Pervious ,Acres V. C. La3rr�i'i, Flat 25. PerviousT ota! 11.25 ;'. ;.` :.:.::: acres::::.' . Impervious Total Basin Total .: Ades:...... . qes lett Zera...._. Select By `<` .... Gfl 31 Available Impervious Acres :ROADS/FLAT:. ROOF TOPS F! wl DRIVEWAYS/FLAT 51DF'�ALKSIFI qes lett Zera...._. Select By `<` .... Gfl 31 P.ssed iasriiki " aecf ....:..................0:.....9......:..........:............:..........;..:....:..::'..:::.. .:....... B u bb as i n Nif rne: ypaS etl'.B`asirr: ':<''. ' ''<':. `r :c+ t— . © esi&iat� �8 Bypass for PO C. Sa :}u'.r. face IntkeGIr1f'.:owr Groundwater ''WIows To: D ::. I.ttch...................................... Area in Basin Available Pervious Acres C Lawn, Flat;:; S}'vw.O.NiS i. cW Available Impervious Acres ROADSIFI:AT d S I O F1+'At K.5IFLQT 32 11 W Frequency ?1.L7W (0 S) 6.7131 2 Year = 0.36 2 5 Year 014669 113 Year = 4.4754 127 'fear 1:.5665 5C Year= 0.5377 3.00 Year m 4.7319 AnlIV.&.i ? e4)s 1949 0.4344 1951) 0.3969 1951 0.2E96 9.95.2 L'.2G19 ' 1953 4.2184 1958 1955 ❑-2916 C F766 iL•.1 ........,,......___..__.,......._ -------- j J 0.5 1 2 5 !? 2cr K 50 7; E7 ep .5 Sheam Prozectkm DwaliOn_ LM Du af_ _ F., W ES [�:A'sk _ FEW. �rug!xy 5 WO --d lnM WILu s µL10 9.pui F1ccs�ar5� L7waiiyn 1 T Rec ,gge P�ede•,ped D.1 :? `Ua aph Y• !x Ii rZ-echarge M. - [t J 1.957 1 5958 1959 1850 Y951 13.2745 0,3339 tl.2459 C.23S77 0.28113 G.2786 Axafpze datasets G:,mp2sc3 Wl7?F �tll711 Pcadeven edYmu .:: 10 year 0.4754 1958 C -2213 3 709.;� 0. 6377 100 year 0.71-19 2!,Iflow.toPOC2Mi6ga±od:::: .:::. •, xss4 i3.249tl X 703!nflma aPOE 3Miligated:.....: 801 FQC1 Maigatfflowr:: 802 ME 2 Mitigpte:f flay 803POE 3AlrtfgatePlow :::::::::.:..% 1969 0.3174 w W A.��Ja[asets�µ F�nv Stage T �^ Prem � i 19'1f] L+.2695 Pvap 3 PQC ^ t'L7C 2 �€][:3 �. �. 1971 4.3447 w..........__.........1...._.. -_.r �.-..-_�.--.......-...� Flc;ad ncy 7,felhcd;...�.�: �::�: �:.�. i 1.972 C. 4625 r Log Fes;son 7ygnI i7©::: :: ..... 1973 6.1891 r WOJ f C:hrkx�,:: 1 At point of compliance at the drainage ditch that runs along the north side of NE 2113 Street just downstream of the southwest corner of the site. Flow Frequency Return Periods for Developed condition without mitigation at PUC #1 Return Period Flowtcfs) 2 year 0.3092 5 year 0.4069 10 year 0.4754 25 year 0.5665 50 year 0. 6377 100 year 0.71-19 Q'My .rev - Q10,01Y Pr. --_ #.'+7-7.3 -- 01.0989 = 0.61 t-fs > 0.15 cfs :.pow c on'_rol r:ii_iga�--iorls are rear 7 --red. 33 Part C Performance Standards The site is located in Duration Flow Control Area (Forest existing condition). Since no problem has been identified within the site and its downstream area, level 2 flow control (forest existing condition) is required. Basic water quality treatment is required. Flow control BMPs such as infiltrations and pervious pavements are used in this project to meet the Small lot BMP requirements per Section 1.2.9.2.1 and the Small subdivision project BMP requirements per Section 1.2.9.3.1 of the RSWDM. BMPs need to be applied in the order of preference per Section 1.2.9.2.1 to the maximum extent feasible. After all the BMPs are applied to the maximum extent feasible: then BMPs need to be implemented as described in number 5 in Section 1.2.9.2.2 of the 2917 RSWDM. See Section 2 of this report regarding special requirements, the only special requirement applicable to this site is special requirement 1.3.4 for source control. Dumpsters and recycle bins will be stored in the garages of each houses. Since the site is not a high use site, oil control is not required. The new onsite conveyance system is designed per chapter 4 of the 2017 Renton SWDM to convey the 25 -year peak with 0 inches of free board and the 190 -year peak flows. 34 Part D Flow Contrrol_System Average lot size of this project is approximately 5,534 square feet, Small lot BMP requirements per 2017 Renton SWDM Section 1.2.9.2.1 apply to this project. BMPs must be implemented, at minimum, for an impervious area equal to at least 10% of the site/lot for site/lot size up to 11,000 square feet and at least 20% of the sitellot for site/lot size between 11,000 and 22,000 square feet. The feasibility and applicability of full dispersion was studied first. The study found full dispersion is not suitable for this site to fully disperse the new impervious areas and new nonnative pervious areas because long native flow path is not available due to the dimensions of the overall site and the existing onsite development as a single-family residence. According to the Geotechnical report and the small pit infiltration test result, onsite soils are fine sands. Pervious pavement and infiltration BMPs are suitable for this site. The following flow control BMPs are used to meet the requirements: 1. Full infiltration will be used to treat runoffs from Lot 1 through lot 4. The upper 4 lots are relatively flat, slope at the shared driveway is approximately 1 to 2% and the shared driveway can be used as the access path for the maintenance of the infiltration trench under it. 2. Limited infiltration will be used to treat part of the roof runoffs from lot 5 and 6. The lower 2 dots are located in moderated slope area, concentrated large infiltration device is not suitable, but smaller infiltration trenches in individual lots are feasible. 3. Pervious asphalt and pervious concrete pavements will be used for onsite shared driveways and private driveways and walkways. 4. Tree retention. A tree retention plan is prepared to preserve some significant trees on the site. Total lot area of the 6 lots = 33,204 sf. 10% of the total lot size = 3,320 sf. = 0.08 acres Total impervious area treated by full infiltration = 0.31 acres (north basin). Total impervious area treated by limited infiltration = 0.046 acres (south basin roofs) Total impervious area treated by pervious concrete driveways = 0.03 acres (private driveways for south basin) Total impervious area treated by Flow control BMPs = 0.386 acres > 0.08 acres, o.k. Final signed Flow Control BMP Covenant is required prior permit is issued and will be recorded with the Final Short Plat map. 35 Full infiltration for North basin (infiltration trench #1): Total drainage area = 0.62 acres (area include lots 1-4, access tract for lots 1-4 and the west half the right of way of Hoquiam Avenue NE along the frontage of the site north of the access tract for lots 1-4, this area will be collected and conveyed to the infiltration trench under the shared access driveway for lots 1 through 4). Asphalt pavement for Hoquiam Ave NE = 0.04 acres. Sidewalk for Hoquiam Ave NE = 0.01 acres. Shared and private driveways for lots 1-4 = 0.0E acres (Use pervious pavement BMP for these areas, credited as 50% impervious area and 50% grass), counted as 0.03 acres of impervious area after apply Flow control BMP credits. Roof area for Tats 1-4 = 0.20 acres. Total impervious area = 0.28 acres (after applying flow control BMP credit for pervious pavement) Total pervious area = 0.62 — 0.28 = 0.34 acres (till grass, soil group C). A 77.5' L x 22.75' W x 5.5' deep infiltration trench (drainage rock bed size) with 30 StormTech MC -3500 chambers and E MC -3500 end caps is used to provide full 36 infiltration for the north basin. The infiltration trench is located under the shared driveway for lots 1 through 4. According to the "Pilot Infiltration Testing and Subsurface Conditions for Greens Landing" by Riley Group, measured infiltration rate is 1.8 inch/hour, after applying the safety factors 0.5 (F testing) and 0.8 (F plugging), Final correction factor is 0.40. Long term design infiltration rate is 6.70 inch/hour. Required Iive storage = 0.114 acre-feet = 4,966 cf. MC -3500 chamber storage = 113 cf.lchamber MC -3500 end cap storage ='15.6 cf./end cap Total chamber storage = 30 113 + 6 * 15.6 = 3,484 cf. Total drainage rock volume 77.5 * 22.75 * 5.5 -- 3,484 = 6,213 cf. Total drainage rock storage (40% void) = 0.4 * 6,213 = 2,485 cf. Total system live storage provided = 3,484 + 2,485 = 5,969 cf. > 4,966 cf., o.k. A CDS-2015-4 unit is used upstream of the infiltration trench for pretreatment and spill control. 31/ CI"I'Y OF RENTON SURFACE WATER DESIGN MANUAL REFERENCE A -A CITY OF RENNTON APPROVED PROPRIETARY FACILITIES FOR USE ON PRIVVATE DEVELOPMENT PROJECTS The proprietary facilities surnrnarized in `]'able 14.A are approved by the City for use on private development projects. The General Use Level Designation (GUI..D) letters 'for each of the approved facilities listed is 'Fable I4.A are included in this reference section. These GUI_.D tetters outline the sizing requirements and maintenance requirements for each approved proprietary facility. Appendix A also includes more detailed maintenance information for the proprietary facilities listed in Deference Section 14-13. '.: TABLE 14.A PR(3PRIETA[tY FACILITIES- CURRENT APPROVALS .. . Enhanced Lake Proprietary Facility Name Basic WQ Basic WCC Protection High -lase Pretreatment _ BayFilter X _ ' MWS -Linear Modular X X X Wetiand Filterra System i X X x_.. __._.. X ....._.___.._.__ Filterra Bioscape� w X X X X Media Filtration System 1 X StormFilter using X X PhosphoSorh Media StormFiiter using ZPG X Media FloGard Perk Filter X X ecostorrn plus X ' Aqua -Swirl System _..._.. _._.._.... _ _ ... m- X CDS Stormwater Treatment j i X System Vortechs System X Downstream Defender Stormceptor ! X X Other Facilities with a X X X j X X General €.1se: Level 1 l Designation (GOLD) 2017 City of Renton Surface Water Manu d 12/12/2016 Ref 14-A-1 ,4A5@I#Gi Ck it Vii; 7 FPA 0 -, ?A i G f E C 0 L 0 G Y July 2016 GENERAL USE LEVEL DESIGNATION FOR PRETREATMENT (TSS) AND CONDITIONAL USE LEVEL DESIGNATION FOR OIL CONTROI, For CONTECII Engineered Solutions CDS' System 1Naier..QuaIity. Ftoiu CDS Model: .:.:.: ............ . �1� CDS 2015-4 :::...6.7. G r9.8.. CDS. 2015-5:::. '::.'...:0.7.. CDS 2020-5 ::: 1.1::.:.:. '..';:::.:31'2:.: 353020-6.::: .:'::.:..:. `2 ::.:. . `:. ':56.6 : c: : CDS30356..:.:. CD544130-8'':: CDS4040-8 ..::.. : `. `::::: 6` ,` . > . ; ::169.9 CDS 4 :212.4....`... CDS564{1.-10::::' '. ; ::: 9:::.:: 254.9.:.: 14 : :`. ......39.6.5:.. 538:1. CDS5678-1U:::.:::: . 25 r .:...::... 7.08 :. ........... .......... :........ CDS3030-V.'.::: . ::....:::...:........::.: C[}SQ030-7.::::. 4.5. `...:.::::`.127.4. `:..: ;i 254.9:: . a CD5565378 : ' ::.:.14 `::.., :.: ;:396:5 ::: ..' CDS..5 ... ; :::.:;.:.::.19..:::..:::: ..538.1.. :CD55678-8.::.. ::: ; 25.:.::...::.:78:::: COS5042::..::.::.:: CDS7070.:.:::'::'::.':25:.. `:'.:.::::736..3;:. C[]S10©60.: :: :.. ;.. 3Q.:.::'::.:. 849:5 :.: 3..:..: ..:. CD51.i30$p:.::. ;. .. , : 50;..::.; .` ,1.4 .5..:.': Cast':...:..:::. CDS150184-22: 148:`:`,..:...4191:.4: in '...1.:. CDS2E1€115426: 270:::.: ::: 7646..6: CDS24©160-32:::::. : 300.... Applicant: Contech Engineered Solutions Applicant's Address: 11835 NE Glen. Widing Drive Portland, 4R 97220 Application Documents: • Contech Stormwater Solutions Application to: Washington State Department of Ecology Water Quality Program for General Use Level Designation — Pretreatment Applications and Conditional Use Level Designation — Oil Treatment of the Continuous Deflective Separation (CDSI'�,) Technology (]urie 2007) • Strynchuk., .17oyal, and England, The Use of a CDS Unit for Sediment Control in Brevard County. • Walker, Allison, Wong, and Wootton, .Removal ref %spended Solids and Associated .Pollutants by a CDS Gross Pollutant Traxs, Cooperative Researeh Centre for Catchment Hydrology, Report 9912, February 1999 • Allison, Walker, Chievv, O'Neill, \i l.cMahon, From Roads to Rivers Gross Pollutant Removal from Urban Waterrvays, Cooperative Research Centre for Catchment Hydrology, Report 9816, .May 1998 ■ Quality Assurance Project Plaza CDS ' f'or Cil `Treatment Performance Evaluation received by Ecology January 15'h 2013. • CDS with Sorbents Preliminary Report received by Ecology October 1.5, 2015, Applicant's Use Level Request: = General use level designation as a pretreatment device and conditional use level designation as an oil and grease device in accordance with Ecology's Stormwater Management Mannal for Western Washington. Applicant's .Performance Claims Based on laboratory trials, the CDST System will achieve 50% removal of total suspended solids with d5o of 50-}tm and 80% removal of total suspended solids with dso of 125 -gm at 100% design flowrate with typical influent concentration of 200-mg/.L. Contech can design the C.DSTM system to achieve the effluent concentration less than 10 inglL for total petroleum hydrocarbons. The CDS system equipped with standard oil baffle and addition of oil sorbent is effective in control of oil and maintain theTPH level below the Ecology -specified level (<10-mglL) for applications in typical urban runoff pollution control. Ecology's Recommendation: Ecology finds that: = The CDSTNI system, sized per the table above, should provide, at a minimum, equivalent performance to a presettling basin as defined in the most recent Stormwater Management .[Manual fop Western Washington, Volume U Chapter 6. Findings of fact: L Laboratory testing was completed on a CDS 2020 unit equipped with 2400 -um screen. using OK- 110 sand (dso of 106 -um) at flowrates ranging from 100 to 125% of the design flowrate (I . I cfs) with a target influent of 200 mg/L. Laboratory results for the OK- 110 sand showed removal rates from. about 65% to 99% removal with 80% removal occurring neat- 70% of the design flowrate. 2. Laboratory testing was completed on a CDS 2020 unit equipped with 2400-1.Lm screen using "UF" sediment (dso of 20 to 30 -pm) at flowrates ranging from 1.00 to 125% of the design flowrate (1.1 cfs) with a target influent of 2€70 mg/I.. Laboratory results for the "UP sediment showed .removal rates from about 42% to 94% removal with 80% removal occurring at 5% of the design flow -rate. 3. Laboratory testing was completed on a CDS 2020 unit equipped with 4700 -tun screen using OK -110 sand (d50 of 106 -um) at flowrates ranging from IUD to 125% of the design. flowrate (I . I cfs) with a target influent of 200 mg/L. Laboratory results for the OK -110 sand showed removal rates from about 45% to 99% removal with an average remova10 f 83.1%. 4. Laboratory testing was completed on a CDS 2420 unit equipped with 4700 -um screen using "UF" sediment (dso of 20 to 30-N.m) at flowrates ranging from 104 to 125% of the design flowrate (1.1 efs) with a target influent of 200 mg/L. Laboratory results for the "UF" sediment showed removal rates from about 39% to 88% removal with an average removal of 56.1%. 5. Contech completed laboratory testing on a CDS2020 unit using motor oil at flowrates ranging from 25% to 75% of the design flowrate (I.I cfs) with influents ranging from 7 to 47 mg/L. Laboratory results showed removal rates from. 27% to 92% removal. A spill test was also run at 10% of the design flowrate with an influent of 82,000 mg/L with an average percent capture of 94.5% 6. Independent parties in California, Florida, and Australia completed various field studies. Field studies showed the potential for the unit to remove oils and grease and total suspended solids, and capture [4)0% gross solids greater than the aperture site of the screen under treatment flow rate. 7. Contech is conducting a field evaluation of a CDS2015 with Sorbents for oil and grease removal. To date, the unit has been evaluated at flow rates ranging from 42% to 119% of the design flow rate: (0.28cfs) with influent motor oil concentrations ranging from 0.46 to 64.8 rng!1. (median of 4.5 mg/L; mean of 12.6 mgll.). A preliminary report showed a mean motor oil removal efficiency of 72%, with a UCI.95 for effluent concentration of 0.75 mg/L. 8. CDS Technology has been widely accepted with over 6,200 installations in the United States and Canada. There are over 1,380 installations in Washington and Oregon. Technology Description: Engineers can download a technology description from the company's website. "Ac ,w.comeches.corn Recommended Research and Development: Ecology encourages Contech to pursue continuous improvements to the CDS systern. 'To that end, Ecology makes the following recommendations: 1. Conduct testing to quantify the flowrate at which resuspension occurs. 2. Conduct testing on various sized CDS units to verify the siring technique is appropriate. 3. 'fest the system under normal operating conditions, pollutants partially tilling the swirt concentrator. results obtained .for "clean" systems may not be representative of typical performance. Contact Information: Applicant Contact: Sean Darcy Contech Engineered Solutions (800) 548-4667 sdarcw conteches.cotp Applicant website: http;l/www.conteches.coin/ Ecology web link: li_ ttp:riyv�A2E.e v.�vaL.gov/12i-ograms/wq/storiiiwater'neutech/index.hti-n Ecology: Douglas C. Howie. P.E. Department of Ecology Water Quality .P ogramn (360) 407-6444 douglas. ho ie(a,e Revision History Date y Revision 1u!y_2048 C7r'ginal use -level -designation document February 2410 Reinstate Contech's nil Control PULD August 2012 _ Revised design storm criteria, revised nil control QAPP, TER, and ; Ex iration dates _ -------_.._.M _ December 2012 _ _ Revised Contech Engineered Solutions Contact Information; Added QAPP for Oil Treatment ._. lvla µ Revised model numbers in Attachment 3. _201-') 2414 Revised Due dates for QAPP and TEK and charted Ex iration date _April August 201.4 Revised Due dates for QAPP and 'TER and changed Expiration date July 2016 Updated Oil Control PULD to a CULD based on preliminary field .._..._mr__ rnonitorin results www�.�..._....._...... Ades: Impervious Total Basin Total 10,G2 w. ` Acres';..:; ,....... ............................. Deselect ero .... Select By: "; `;;,�i ;. ;r;.:::;':: G9 38 Facility Name:::::................G Downstream Connection Facility Type r l'iecipitativ:.Appiie j to: VapaEation Applied t€7 E acElity ..:..:: Facility Dimensions .......-.. a Trench Length (ft):,:'`;':< Reduction Factor (infiltxfactor) Trench Bottom Width (ft) 22:75. •::� Effective Total Depth (ft) Pt�� � Bottom slope (ft/ft) f?Q13:;;1`1'- Left Side Slope (H/V) TotalValurme Through Faciity ae ft 717.352 Right Side Slope [H M) 0.003 Material Layers for Trench/Bed Layer 1 Thickness (ft) r- 777 Layer 1 porosity (0-1) :; ::`': MC2M Layer 2 Thickness (ft) Layer 2 porosity (0-1) 16,f3 :? Layer "a Thickness (ft) Layer 3 porosity (0.1 ] .............. Infiltration YES ., Outlet Structure Data. . Riser Height (ft) f 5.� Riser Diameter (rn) 1p � Riser Type Flat Notch Type []orifice Diameter Height Number (in) (ft) F-01 `-i T— _.J Trench Volume at Fuse€ Head (ac-ftl 114 Measured Infiltration Rate (in2hrj1.5 .......-.. a Reduction Factor (infiltxfactor) Show Trench tlpen Table Use Wetted Surface Area (sidewallsjE Pt�� � Initial Stage (f t Total Volume Infiltrated (ac -ft] 7'0.349 TotalValurme Through Faciity ae ft 717.352 Total Volume Through Riser fac-ft) 0.003 Percent Infiltrated 100 ..:.......................:.. .. . . ..... Size lnfiltration Trench Targe % 110 39 ® 1.�i. .... .... ....... .. .. .:C ... . ,umUlra4.e Pmi3aillit� O.Y.................................................................... .. .... ... .... ... .. ...... Flaw Emlxc:eZ:Cy �.� Plow{cfss L802 12 Year. •= C.15000 S Year � 8.000❑ .. ........ ... O:i IC Year = 11.0000 2..5 Xuar. µ F3.6g00 58 Year = 0.0000 e1CQ Year w 0.0000 �A.., Peaks ISCargcs rrog1x(rn ry- 10.0 •............ .... .. ......... .. ...... �r_..p i1feet) 7.025 .......... .... ............ Cumulaiue: rot a6ila-, .2 year u 0.9582 .5 Year 3.17487 + 1111 year = 2.4271 +++. 25 Year 3.4701 .�µ 5z Year = 4.4130 y„ �+ AOGYear p a.A :u/r.l � � n .. • AnlCek9 E � - 1• 3025 1949 [[[ _++-�+'i•Ryrr g 1350 7.932 1953 € 1954 U. y...- ..•,� • ; 0.1 1955 11.5 1 2 .5 K 37 :6 RO :7 rn 59;5.5 S't6 1936 1957 _ Stre_am Prde_ction_GsatlR. _ JD L':xatirx:FIc, F'f 'Nsnf;y WmN qursy i{ydregaph rr 1998 WEiI.%ni Input VOJmcs JD IRepa: jM Re&,argeb�atio2 Reclzge Predev&ped mRerhage t! igaketi 3 1960 Analyze dataaels inl9park W€7M I w�•� �. �... 7.961 103 DitohSTAGE Mltigeted::.: :. 1962 tl7?3;IauR3$TA3EMd'ared� 7.953 .2".a--.�_.._._..... .._... 19E4 x96'13 j 1966 EE 1997 AE vatasQ�s...µf.mWRow~...... Stage Pry 197[3 1971 Evap POC? ?OC2 Hund. FmsA-mfg?. xf:: 3,9'72 .... M.�..�........�� .-. C.' Lag Pearson Typo1:1779 1573 C` Cunmanu:: :..: ::.:: ..:: :::.: 1975 1.1427 1.03391 2. 81 59 0.4826 0.52{15 4.53x9 7-.519.9 1f.9885 1. 1.771 1.035 0.5742 2.6251 0.7439 11.3210 L. 4558 0.7171 C.8SSO 0.48.4.9 2.3378 C.6A56 0.8248 0.64454 0.6650 1•.'1685 0,7434 0.43'15 1.3971 0.6185 40 1950 ❑.4000 ;.553, p.fF80U --•- 1952 0.(k000 1953 11,6000 1954 8.800❑ D ..^^^^^......F -....-f.. ....p..'-..r'.h+..•k1+H; Hx1ih NNxtl1.k11sl.Si-I1rF1 : o 1955 O.rcoc d.5 1 2 5 FO 20 511 Sp ?� 8J :7 95 c0 55sl.51.,L' 1556 0.00110 Y 957 11.(3000 Sfimmf§ancti :Durb�w t JCDwaua ; VdaerQua - Flom Fre¢zerx.: j r [[ }ttdros}r..;.s: J. : 195Ei U•uuoa `.........,.M.......... Wei andira^ Vmimes i UDRe ,t l ..„�„�.. R,,:r 9e.f'iV iim W;u r�ethof4rs Ased nped !?eche�3e Mitiga?ed ? 3-91 O . V1800 ...•...._..................... ...........,........... Ana�yxa FWEazets Conus.! WCF€ -.�-��-- 1960 1961 0.6'400 0.41100 MFlr. [v PGC.( Msti�ated:::::::....::.:::::..:W,.�: , n j •n 1962 0. WOO j7(TiraPu toPRC,2b1�ti 0.0001) 71731rv-•a'KWP6C3M4ialed .::::::.::::..:..:.::.::::: 1964 ❑.GCOO E W1 PaCI MITI e4 df 1.65 0,0000 963 PiSC 3 Miti4cR�ad flmv ::::::::::::.:::..� ::... .: :: 1966 0. Coco 10000£chALL OUTLET 5Mihi ad:�.::: �,��.�:.��:.���:i:.��::::� 1967 0.01100 X00'17s1th57R•a"c.Mit�u�utcd::::::::: ::... ::' ." i9Ge Q.CDt10 (969 0.0400 AIl'J�asats F�1w 's5tageecip 1.9711 O,OTOa Eva:: 33 P.ciC1 II ac7C2 ..•.._..:-.....-.3......�_....�J...µ.:........... �,7C3 11 � ......'.n..f...._..J inpd'!eC'ricy.�cihu3..::::.: 1971 O.OLr00 x: Lcg. Pee3son Typei's1.776,:.: 1972 1.973 O. Oi:00 ❑.8488 F" VJcnsi::::.:...:.�.::::.:::.:.:. 1974 4.111"40 C•Cln�:::::::..::.:::. :1975 8,00118 0.004(1 ISCargcs rrog1x(rn ry- 10.0 •............ .... .. ......... .. ...... �r_..p i1feet) 7.025 .......... .... ............ Cumulaiue: rot a6ila-, .2 year u 0.9582 .5 Year 3.17487 + 1111 year = 2.4271 +++. 25 Year 3.4701 .�µ 5z Year = 4.4130 y„ �+ AOGYear p a.A :u/r.l � � n .. • AnlCek9 E � - 1• 3025 1949 [[[ _++-�+'i•Ryrr g 1350 7.932 1953 € 1954 U. y...- ..•,� • ; 0.1 1955 11.5 1 2 .5 K 37 :6 RO :7 rn 59;5.5 S't6 1936 1957 _ Stre_am Prde_ction_GsatlR. _ JD L':xatirx:FIc, F'f 'Nsnf;y WmN qursy i{ydregaph rr 1998 WEiI.%ni Input VOJmcs JD IRepa: jM Re&,argeb�atio2 Reclzge Predev&ped mRerhage t! igaketi 3 1960 Analyze dataaels inl9park W€7M I w�•� �. �... 7.961 103 DitohSTAGE Mltigeted::.: :. 1962 tl7?3;IauR3$TA3EMd'ared� 7.953 .2".a--.�_.._._..... .._... 19E4 x96'13 j 1966 EE 1997 AE vatasQ�s...µf.mWRow~...... Stage Pry 197[3 1971 Evap POC? ?OC2 Hund. FmsA-mfg?. xf:: 3,9'72 .... M.�..�........�� .-. C.' Lag Pearson Typo1:1779 1573 C` Cunmanu:: :..: ::.:: ..:: :::.: 1975 1.1427 1.03391 2. 81 59 0.4826 0.52{15 4.53x9 7-.519.9 1f.9885 1. 1.771 1.035 0.5742 2.6251 0.7439 11.3210 L. 4558 0.7171 C.8SSO 0.48.4.9 2.3378 C.6A56 0.8248 0.64454 0.6650 1•.'1685 0,7434 0.43'15 1.3971 0.6185 40 100 -year stage of the infiltration trench is 5.49' < 5.5' the overflow elevation of the overflow riser. The infiltration trench is capable of fully infiltrate the 100 -year runoff from the developed north basin. An overflow path is provided from the infiltration trench to the combined detention/wet vault for the south basin. Flow control facility for South basin: A combined detention/wet vault is used to provide the required Level 2 flow control (forest existing condition) at the point of compliance (POC). 2012 VVWHM method with 15 -minute time step is used to size the detention vaults. South basin Total drainage area = 0.621 acres (lots 5-6 and the west half of the right of way of Hoquiam Avenue NE and the east portion of the north half of the right of way of NE 2nd Street along the frontage of the site south of the access tract for lots 1-4, this area will be collected and conveyed to the south combined detention/wet vault). For lots 5 and 6, pervious concrete private driveways and pervious concrete paver walkways are used in each lot. limited infiltration will be used to treat 1,000 square feet of roof area using 21 linear feet of 2' minimum wide, 18" minimum deep gravel infiltration trench in each lot. Asphalt pavement for Hoquiam Ave NE and NE 2nd Street = 0.147 acres. Sidewalk for Hoquiam Ave NE and NE 211 Street = 0.04 acres. Private driveways for lots 5-6 = 0.03 acres (Use pervious pavement BMP for these areas, credited as 50% impervious area and 50% grass), counted as 0.015 acres of impervious area after apply BMP credits. Roof area for lots 5 and 6 = 0.114 acres (use limited infiltration to treat total 2,000 sf. of roof, 1,004 sfllot for lot 5 and 6, credited as 90% impervious area and 10% grass) Roof area for lots 5 and 6 = 0.114 — 2000 * 0.1143560 = 0.109 acres (after-ap plyBMP credits). Total impervious area = 0.311 acres (after applying flow control BMP credit for pervious pavement and roof downspout limited infiltration) Total pervious area = 0.621 -- 0.311 = 0.31 acres (till grass. soil group C) 41 is i Subbasin Name: Scut i'Basi `: `i t)esi n ti? as fay lass fair PL7C 5ufface ( riteff low Groundwater Flows To.- .:....... Area in Basin 5i a v.Only 5eleete� :: . Available Pervious Acres ] .. C Forest: Flat::: F CCL.awn; Flat..:7777771 42 arae aul€ ' ..::::; ..... Facility N �� Outlet 1 outlet 2 Outlet 3 Downstream Connection .WMWr Effective Depth [f t) Infiltration;hld _._.. AuW Vau1L__] Q u i c..1C_Vau..lt.. _.. ......................:.:............. . w .Facility Dimen.sion..Diggrarn Outlet _StruVctur Q-.ta Riser Height (it) 3a :J Riser Diameter [in) 1.z --T.'.1 ..................... .. . Ris, e€ Type Flat -uH Notch Type Orifice Diameter Height Number (in) 00 il.'75 .3 F0 a Vault Volume at R iser Head (ac -ft) 107 Show Vault Table ,Qperi Table `� Iniiiai. stag. M. `:: Bypassed basin Total disturbed area = 0.039 acres (this area will be collected and conveyed to the existing storm drainage system that runs along the north side of NE 2nd Street and bypass the south combined detention/wet vault) Asphalt pavement for NE 2nd Street = 0.022 acres Sidewalk for NE 2nd Street and driveway for vault = 0.01 acres Total impervious area = 0.032 acres Total pervious area = 0.039 --- 0.032 = 0.007 acres (till grass, group C) 43 Available pervious Acres --- Pen+ivus7ntaf D:flQ7 µ ::: cies. lmper icm ictal i7 [] 2:::':;.' 4aes Basin Total Select By:F777777 Go 44 .,_.,_.. w_ jjn._ __.... . ....... ... .--- .. .... 56] PClC7 Aedesclop d The: Pacx11 ey PJ S5i�E] C €i3 - 801 POC ! WOi atad flow j� ?'low4efs] Predev Mxt Psrooutzgn F7aea/Pai1.: i a _75 n7 8"59 4'i ass d P - ..._ 1.0196 X170 75:3 &5 i'd43 'gib •3. Q,03 15974 6753 45 Fass .. - s ;3 5' t"'0 95 FtiS3 _. �. ::.�-_._-.._..-.........._--_._--._..........._....- ____�-.e�y.___-_-.----------------___-___-.---___.---.- 'fj �s.d�2i 12'15 SSE�� 47 Fara S � 1�3.G233 z0a5� 5333 33 saes 50 Pass _---.__. �a s x935 s ^ coos G,Ow?7 '• I1S.G25S V'731 4753 54 P4sa =i55 4559 55 Faas ! N0 . ............ -------- _-__ _-._ ------------- -- ...... �p,4370 7593 4359 57 Pcsss i 1-5 1C1-4 --,4E-3 1GE•1 7 ?C4� r 02 7 7:a FO ^1S0 55 Pas3 € Perccr�i Tme E_ ca�dir�p ,u.0 ::i8 6590 39FI `c0 Pass 10.029" E1.19 3775 C. Paas 5�eam P a ecticr s7uraun D D xalion ow Preauer y W, EOr QudRy tiyrr*ph 5'151 3535 63 pass Fl _ I`......�.................................................�..._ d6 9.0307 3453 34.x,3 S3 F2x8J . _W_yMnd €rout Valrre�13RemedeeloR!EhaygMaev . . 3 63 Pass Anakgze daluxeFs :.empacSWDM x.0321 46x0 3053 63 ftea . ,'�: U.ifa' ri 45'" _,.49 62 Pass rrf eF� .ai::� 4254 3653 eM Ptiss J.Q339 Aii:i7 247f 61 Pass 0.1:35_ 3, 2331 61 P'a.as s735� ^rc G.a5ari .-� _5 6� Pass 0,33 c6 3337 2058 0"� Pa:S9 .:.. :.:.:...,::.:.:...... ❑. CJS 73 3:.31; ?975 'v3 Yass FaSS „7F5 177C• d3 Pass �vap =595 369E 65 Pass A30afasefs Flmnr Stage _., Precip M �9.. .'.;.. G.i40= C 9' 1dp3 HS Fass .......w........... fo[>.i Fro N,wwd:::.:.::: n IF Lig Pe vnT3pe.11i S7B .. :: ]. 3410 2's _I 3510 65 Pa:3s 4_l9 3AF,'.. s.°131 En Pass O.t�2026 3352 E6 pass ❑.0433 1351 ?^_74 E7 Pass Flow duration comparison between mitigated and pre --developed conditions at POC# 1 45 : Plow Fregn cy + X61 Annual Peaks nn... .. .. ... k72;7fk[i' .... ... Flaw{cis} erx:deve xopee 1 xit3gat ct x ft. � ,L �. .r.+• LIfRI&'F$v'L'rrtl 2 Year = 0.0376 ll. 0335 6.037U .w_...........�.....................- f 5 ]`eilt 0402 �. SGl 110 Year = 0. 0713 0. Q599 G.0352 ` 25 YKa.r x+ (1.084P L 073'7 0.1 ..................... * ....... ............ ...................... + . -.. r ........ 0.1 1 50 Year = U.092.1 iF, ",;-I 4 F 3.O0 Year 1.1..0989 O. 0984 1992 0.0261 . 0.0217 45 : + X61 Annual Peaks x ft. � ,L �. .r.+• � 1949 6.037U Q.U21i3 -01 . ... ....... .. .+ .... ...... - .... ...... ...... .... ................. .... SGl 3.90.0 i°. C46I G.0352 1951 C'M9 0.05y6 1992 0.0261 . 0.0217 _ 1.953 G-0$li O.9218 ` 1994 0,0324 O.U308 Oji C1 .._-y - _ __... -_- -_ - ,..{• i:.CO.= Y955 0,05].7 6.0439 6 D.5 1 t Vv V la 20 a' U 30 "r•" ec G•1{{{Lnnn� 1.956 O.C412 0.0'164 3.957 O.C3 2 O.e340 Steam Rote-im Dwation JJ UD 3uratim VbVy ire;quney Waf�Qu6:y }i roraph _.....J Jogap...... -:ti--r..-----... TLV 1958 1,.959 0.0374 €3.C:izY Q.i3297 . ❑.a221 MC MC GRe Irr [ ye~^}rarSaDu:atior. Fec}x.3aePra V� ped itsch �nkd ilate: S 1950 0.0560 Q.G573 Analyze da3asete :l.967. O.II316 0.031Y •;, -_ 1962 Q,i1.197 0,0190 «� x ei�,,.. 1,993 O.i27tl ❑.f3302 1964 0.{:375 ❑.0265 ]{j{ 1465 0.0255 0.t3324 :L956 0.0245 0.0213 1967 0.0512 O. Q40i 1:::..::.:::::..:.::.::.::..:::::. :: :::: :: :: ..: :: : : ::.: 3.568 ❑. tl:3Y9 0.0278 1969 0.0312 11, 0242 «� ....,..3......_.,. �..,. F'�7C1 ..]C2 POz3 7.170 0.0299 0.0253 _ _Eva, Af Etw,es f-z-ry Staff [ F'reclp1 Flcai Frequej.l�iefhcd.:::.:::':::: 971 G. 027 G5 0.039.1 �.�.,.._.,..._..._... ...............„..µ. .µ.....,... ..--..J__...._.._� 1972O.Oa17 ❑.0464 0.LogPCs= iy�Olif.173:.'..:::.' 1973 0.02sa 0. CUM r WeO34.. 0.0418 [Weak 1979 x,0298 0.0323 Flow comparison between mitigated and pre --developed, conditions at POC# l 45 .................................. ..... ............... ..... Cu^luta se Pro6ahti [ ............._ 10.G F Share Trocluency n :feet) 3 f72i y [ :2 Yaar 1.6072 c, k. 5 year 5 Year 1 2.3.792 . E�E t x0 Year 2.5638 r ' -� F + ++60 t 25Year = 3.1]569 �,� 50 year Ydar ue 42-46 i j yNHF+� € 100 Year = 3.807.2 Q4y ......: t.++ ................. € � ..p �........... � ..�.... � + } ...... ..........: .. � nal Peaks 1949 1 43.92 . },950 1.6212 i f 1951 E 1.0804 1953 7.118343 € 1954 1.5326 € Q.'1 ....._._._...-.___-__ Q.1 1955 1.8Bxx 0 115 i 11 g J Vy [} G.S � 2 101• 2p 3J 7� 0 97 95 :8 N W.5 .� ..7 i.,Q x955 P. 5499 1957 1.6aax Stream Pruection s7 i,�aLrosi LIR €}uration Flo�Fre ue Water 4ua3W 9 S Hydra�aph a--.-.�--..f......._.... r 1958 x-50613 . .............l Wu:a;ld Inp-4Vol�xnes Lib Rert Rr[1ge'c3JratlLii r ReuharSK ?3erbvelaPcv-i j 'iecF'.a:ge R?ate3 1959 1.3729 An*ze daiaxetx Corrp'zt WDM 1g60 1961. 2.5793 1.5355 lbd itch STASE MR' ',ed�.�:::::.:.'.:::.:;:. �'. �.:�: ... .' � 1962 0.9I88 1963 1. K153 SRS G[avid.Trenc�6edafprhSFAGE:MsTgated'::'..::'.::?: :'. 1964 1. 4521 1965 1.571G 1366 1.23x9 1447 1.7714 .. .. .. .. .. .. ... .. 1468 1.2998 9969 1.420.1 MMitares FlmvStage P;� A470 1.4312 _ µ µE><ap POC1 P:1C2 FIC'I 1971 1.5256 .._.�. ..................... 1972 1.9957 [:..[Ag Paanon TAa 11i.IA. :.'. i.' � ..'. 1973 1.322-5 1:37& 1.4382 1375 1.7876 1.5577 V Peak stages in south vault 100 -year weak. stage = 3.81' C 4.0', o.k. "low Frequency Return Periods for Predeveloped. POC ##1 Return Period Flow(cfs) 2 year 0.0376 5 year 0.059". 10 year 0.07-3 25 year 0.08r12 50 year 01.0921. 100 year 0.0989 Flow Frequency Return Periods for Mitigated. POC ##1 Return Period Flow(cg's) 2 year 3.0335 [ 0.03'76, c, k. 5 year 0.0482 10 year 0.0589 C 0.0'-"13' 017 . k . 25 year 13.0737 < 0,0842, o.k. 50 year 0.'zO8ur C 0.0921, o.k.. 100 year 0.0984 r 0 , 0989, o. k. The proposed detention vault meets the requirements for conservation flew control and provides Level 3 flow control performance at point of compliance. 46 i1.as Y .... ................ .... ...................... r.............................................................. umural:ve Probability - 4 j + 703 iL ?law[afg) l.5 i 2 5 FO 23 310 K 7u 8:} 6J 95 gg 999:.5 ?CO Stream Pjolection Dl:rdlion L[D DLza€ion Flaw: seauenc� �_.. W der�7rralit y l lydrngsaph ..,f WtAand Input Vaiume3MI b. -3O Retort 9Eea cadge DwationWt Ra harge P,edeveloocdj Recharge Mst;gatedJ y Analyze datasets C0mP,cQ1 DM.j 50 Year = 0.2950 501 POC I RedevebP4�0 ficw ......:.::. . ' : ; :::..; : + ; ` `. A 7011nfEc 16POCI M:igateci 702in6d to POC2W1 aierl:.......:::::::::.:..:.:.:::::;:.<.:`:.: - 90E POC 7.WgalPdflow .:;:::;:. 802 POO Mgalec Eloa 803 AOC 3 Mitigat Elow MOD DittchA L:OtiTLETS Ktb�ated:::.:.. ';::: , ;:.::.:::.::: v v Hifi Jatase s m Flow $4age F'rec p n'PC ..._..u._ P ..� ..�..........m__�____._r ...w._.._� Fly Frsq:6ncy.Mt-hud, Log:Pea[sa-r. Type M.1..79'. Flow Fragaency ?law[afg) 0703 2 Year - 0.1393 5 Year - 0.1854 10 Year = 0.2100 25 Year - 0.2616 50 Year = 0.2950 LOU Year 0.:3319 3.999 1950 3.95.1 1552 1953 1954 1955 1955 1957 1958 1959 1960 1961 1.962 1953 1964 1965 196E 1967 1968 3.969 1,970 1971 3.972 1.673 1974 1975 13.976 Pea}C_ 0.1986 0. 1847 0.1231 ❑ , 3.3888 0.0961 0.1131 ❑.1235 0.1228 0.1517 0.1,095 0.1007 0.1266 0.1259 0.0974 0.12213 0.1118 0.1594 0.0950 0.1863 6.1916 0.1445 0.1298 a] 155 0 0.1856 0.0835 011478 0.1542 ❑.11$1 100 -year peals inflow (WVVHM 2012 15 -minute time step) to the combined detentionlwet vault: Qin 100yr = 0.33199 cfs Over flow capacity of the 12" flaw control riser at head = 0.2' Qriser =Qweir=9.739*❑*H**(312)=9.739*1 *0.2** 1.5 = 0.87 cfs > 0.3319 cfs, o.k. The 12" flaw control riser has enough capacity to bypass the 100Myear peak flow. 47 Part E Water Quality _System North basin pre-treatment upstream of infiltration trench#1 48 Flaw r¢enc} • �.n ............. �i:m lative r raba'�ili .r �.n _ �� Flory j C702 --- •_ 2 Year w 15 Year 0.1298 ❑.1748 10 Y':ar - 0.2069 3. + 125 Year m 0.2501 +•,•"r'+ T 150 sear -. 0.2844 tra qty+: 1 11.003 Year = 0.3204 - - ....................... .............. 4 + +'+ ........-.,..3 Pru ua3. Peaks C� + 702 € 1949 0.1876 1950 0.1.775 1931 0.7.3.62 1952 CX806 1953 C.i;872 1 1954 0.105.1 0.69. ..._...µ._.....�. 3 G.�1 7.955 1956 0.1141 0.1136 J a-5 '1 2 5 10 23 TO K 7`} U 4 r5 S8 CCGC.5 3„U 1957 0.1424 54eatn protea ion Driation �0 f]u;ation Fkjw Frequency 'Water Q aRy � >�gdmg•aph - �- tiyytlar d Input Volumes LID Repan! D.. Rectrarg� D t.raLM��M Rer.Y�arga f'sed��l❑ped fieah ge PArhgated 1958 1959 -1,960 196i 0.1x70 7 0.09011 0.1217 0.1176 Analyze datasets i rrpaet WUM � 001 PF1.1 Ft�deve§sped `Eaw h 1942 0.1389[7 ..:: 70' 1. to POC I Mik.ated. ,:,.:.,..,..,,,. „. : `.:.... 19 6 0.1139 •m s • ' ..,,, ;:' - A 1964 0.1037 703.1rbwin.POE.3.Hi6oatecf 1955 0.1501 001 AQC.1 Ali[ j ed flow' :::.::::.:::.::::::: .:::.::.::::.:. ::: 1.802 POC .2MAigated€ova..;:: ':;.,.;::.:.;:::., :.:,`:;::,:.::: 3966 0.01377 003 pf]C3litigakedfl❑sv:: ]967 0.1791 r tifl0€i[3'stot3ti hALLFLETS t"dlg3lBd:.:::: ;.::. ;::.:.;.:''. V 1968 0.1778 _ -1969 €;.1360 M Dalaxeisµ� F it 5tage Psecap 1970 1.971 C. 1206 C. 1442 1971 0. 1769 1973 C. 0769 C'.weiazlf.::.::.::::...:: 1974 1975 0,1452 C'. 48 All Datasets Flow � Stage Precip Evap :.fei6u11 `.' C. G ringprterr:.:': Water Quality SMP Flow and volume for. PCC #2 Dn 1ine £aciliby volume: II.Ge52 acre-feet on-line facility target flow: 0.0454 cfs. Adjusted for 15 min: 0.3454 cfs. �1 Off-line facility target flow: 3,02.51 cfs, Adjusted for 15 min: 0.6251 cfs. Required water quality flow rate for ran -line facility = 0.0454 cfs. Required peak bypass capacity = Q100y = 0.3204 cfs Use a Contech CDS 2015-4 unit to provide the pre-treatment downstream infiltration trench. Qwq = 0.70 cfs > 0.0454 cfs, o.k. Qpeak bypass = 10.0 cfs > 0.3204 cfs, o. k. and spill control for the 49 South combined detention/wet vault: _ All Datas0Flow FE stage Precip E Vap PQc 1 POC 2 POC 3 Water Qvality BIW Flow and Volume for POC #3 On-line facility volume: 0.6474 acre --feet 0n -line facility target flow: 0.050" cf's. Adjusted for 15 kn: Oi 0501 c£s. Off -lip -L- facility target flaw: 0.0278 cfs. Fbad Fretjueri .Niethvcl. i+ Log .PeaFMI Type III 7 78 r::~ibia1[ s Ciatiriaie: €. Required water quality dead storage = 0.0474 acre-feet = 2,065 cf. Designed as a two -cell vault with inside dimension of 44' long x 27' wide x 4' deep with total provided dead storage of 4,752 cf. WWHM2012 PROJECT REPORT 50 Project Name: Site Name: Glen I s LaTtc inq Site Address: 5008 NE 2nd 5t city . �en�on Report Date: 113!2018 Gage sea .aC Hata Start : 1948/10/0.1 Data End : 2009/09/30 Precip Scale: 1.00 Version : 2013/1'./20 Low Flow Threshold for POC 1 : .50 Percent of tie 2 Year High Flow Threshold for POC 1: 50 yea -- Low Flow Threshold for POC 2 : 50 Perce-:.t o.F- LI -Le 2 Year. High. Flow Threshold for POC 2: 50 year Low Flow Threshold for POC 3 . `-,•0 Pe_T.' c3 r: z. of Che 2 Year High Flow Threshold for POC 3: SO year PREDEVELOPED LAND USE Name Fro,-,ec:- S-te Bypass: Nc, GroundWater: No Pervious Land Use: Acres C, Forest, Flat 1.28 Pervious Total. 1.28 Impervious Land Use Acres Impervious Total 0 Basin Total 1.28 Element Flows To: Surface interf low Groundwater 51 MI T I GATED LAM USE Acres Name . NOT -111 Saw _i.n .31 Bypass: No 0.31 GroundWater: No Acres Pervious Land Use Acres C, Lawn, Flat .34 Pervious Total 0.34 Im ervious Land Use Acres ROADS FLAT 0.04 ROOF TOPS FLAT 0.2 ]DRIVEWAY'S FLAT 0.03 SIDEWALKS FLAT 0.01 Impervious Total 0.28 Basin. Total. 0.62 Element Flows To: Surface Interflow Groundwater Gravel Trench `SPC:. T!s'L r[- rve - 'Trench Bed Nort Name . .3ou1!-h B3 --Si : Bypass: No GroundWater: No Pervious Land. Use Acres C, Lawn, Flat. .31 Pervious Total 0.31 impervious band Use Acres ROADS FIAT 0.147 ROOF" TOPS FLAT 0.109 DRIVEWAY'S FLAT 0.015 SIDEWALKS FLAT 0.04 Impervious Total. 0.311 Basin Total. 0.621 Element Flows To: Surface Interflow Groundwater 52 V a u:.. t. Vau 1 t 1. Name . Bypassed Basin Bypass: No Cround.Water: No Pervious Land Use Acres C, Lawn, Flat .007 Pervious Total 0.007 impervious Land Use Acres ROADS FLAT 0.022 SIDEWALKS FLAT 0.03- Impervious .01 Impervious Total. 0.032 Basin Total 0.039 Element Flours To: Surface Interflow Di. ch 'Ditch Name . Di. (-,h Bottom Length: 10.00 rt. Bottom Width: 1.00 f'._. Manning's ni 0.03 Channel bottom. slope 1: 0.0E To ? Channel. Left side slope 0: 2 o I Channel right side slope 2: ? To 1. Discharge Structure Miser Height: 0 Riser Diameter: 7 in. Element Flows To: outlet 1 Outlet 2 Channel Hydraulic Table Groundwater Stage(ft) Area (ac) volume (ac: -f t.) ischar e {(--fs) Sn£ilt (cfs) 0.0000 0.000 0.000 0.0010 0.007 0.016'] .1.000 0.700 0.01.3 0.000 0.0333 0.0001 0.000 0.042 0.000 0.0100 ;1.`i;00 0.000 0.084 0.000 (}.7667 0. .00 0].010 0.138 0.011"1 0.0833 J -V0 0.000 0.202 1.00 53 0.1 loo 0.100 0.000 .).2..7"1 0.000 0.11.67 0 .0:00 0-000 0.363 0. 00; 0.1333 0.'Ol0C7 0.000 v. 4 5: 0. ;00 U.7.5u� 0.000 0.000 0.356 0.:00 ,.16167 0.00: 0,000 0.6841 0. C0`.' 7.1833 0.000 0.0007 0.8.12 0.000 2:70,0 0 .000 0.000 0. 952 0.000 0.21-67 0.00: 0. 0 10 0 1 . 102 0..700 0.2333 0.007 0.000 1.264 0.0010 0.2500 0.000 0.000 1.438 0.000 0.2667 0.000 0.000 1.623 0.000 0.2833 0.000 0.000 1..820 0.000 0.3000 0.001 0.0001 2.030 0.000 0.37.6'? 0. w00 0.0-00 2.251. 0.000 0.3333 0.000 0.000 2.465 0.0.00 0.3500 0.000 0.0100 2.732 0.000 0.3661 0.00.0 0.000 2.992 0.000 0.3833 0.700 0.0:70 3.265 0.000 0 . f000 0.001) 0.000 3.551 0.000 0.41.6'? 0,000 0.0-00 3.8511 l;.[]w0 0.4:33.3 0.700 0.000 4.164 0.000 0.x'_507 0.1000 ... 300 4 .492 (i . 01)0 0.4667 0.000 0.000 4.834 0.000 0.4033 0.000 11.0005"90 0.000 0.57'00 0.000 . .000 5.560 0.00, 0.5161 0.000 -00.:'.•00 5.946 0.000 0.5333 0.030 4.000 6.346 0.5500 0.000 0.00,7 6.'762 0.0-90 0.566'-l' 0. 000 0.00 0 e .193 :7.:000 313.3 0.000 0.0010 7.639 0.000 0.6000 0 0. 000 0.000, 8. 1.02 C.000 0r. 6-67 0. 000 10. c0C: 8.580 •.3.. 000 6333 0 . 00..0 0. 000 9. 0'? 5 0. 000 0.6500 0.000 n,.000 9.'-86 0.000 0. 6667 0. 00'0 0. iU10 10.1- 0.000 0.6833 0.000 7.000 1.0.65 0.000 0.00,00.1000 1-.22 0. 0100 ?.7167 C'.0: U 0. JUv 1 .. 79 0. 000 0.'733 3 0.000 0.000 .1.2 • 39 0.000 0.7500 0.000 0.000 i3.03 0.000 0.7667 0,000 0.U00 7.3.6 3 0,000 0.7833 11.001 0.000 1.4.28 0.000 0,8000 0.x}01. 0.0001 1'd . 95 0.000 0.8167 0.001 0.000 15.64 0.000 0.8333 0.001 0.000 16.34 3.000 0.8500 001. 0.000 _7.06 0'.000 0.x866"? .1_001 0.000 _ •7.81 0.0707 0.8833 0.6Cl 0.000 18.57 0.000 0.9000 7.001 0.000 A .35 0.000 0.91.6' 0.70;`_ 0.000 2:7.15 0.000 0.9333 0.001. 0.000 20.97 0.000 0.9;00 0.001. 0.000 2i.8- 0.000 0.9667 0.0011. 0.000 22.66 0.1007 0.9933 0.001- 01. 700 23. `_34 0-1000 1.0700 0.001 0.001 24.44 0.000 1.0-167 0.00-1 0 .000 25.36 0-000 1.0333 0.001 0.000 26.30 0.000 54 1 05010 c,. e 11 0.000 27.27 0.000. _.0667 0.001 0.000 28.25 0.01"1 1.. (}833 u . 001 0. U 10 29.25 0. 00=0 _.1000 01.001 0.0100 30.28 0.000 1. 1167 0. 001. 0 . C]v0 31 .3:3 0.000 1..1333 %0.01101 0.000 32.39 0.000 1.1500 0.007. 0.000 33.48 0.000 1.1667 0.000 0.000 .34.60 0.00,0 1..1.8 33 0.001 0.000 35.73 0.000 1.20;00 0. 0101 0-00,a 36.89 0.000 7..21,6 7 0.001, 0.00-i 38.0"! 0.000 1.2333 0 501 03.001 39.27 0.000 1.2500 0.001 0.010-.. 40. 5r; 0.000 1..1667 ii. 0701. 0.001 0.000 1.2833 0.001 0.00". 43.02 0.000 1.31;00 0.001. 0.0071 44.32 0.06010 1.. 31.r`7 01;.00017. 0.007. 45.64 0.0^0 1.3333 0.001 0.001 46.98 0.000 1.3 5, 00 ;;.7 )1 '0.00"1 48.31• ().000 1..3667 0.001 0.001 49.74 1.000 1.3833 0.001 ().057. 51.16 0.000 1.4000 0.001 0101.001 52.60 0.0100 1..41.67 0.00.1 0'.0;]1 54.06 :.00% 1.4333 0.001. 0.001 5.5.55 0.000 1.45500 0.007. .x.001 57.07' 001.000 1.4 67 0. U1 3[]1. 5:x.61 0.000 1.4833 0.101 0.001 60.17 0.000 1..`]v(];0 ".001 6'01 6.1.'76 0.000 1.51.67 0.00J. 0.001 63.38 0.000 Name Vau:.l. t 1 Width 27 Length 44 =t. Depth. 4 :f'. t . Discharae Structure Riser Height: 3.9 Riser Diameter: 12 Orifice 1 Diameter: 0. Orifice 2 Diameter: 1, Element Flows To: Outlet 1 1..01. t -ch 7 5 .1n . Elevation: 0 r r. i rl . Elevation: 1 . 4 Outlet 2 55 Vault Hydraulic Table ata a (ft) ,Area (aq-) ❑vl.wae (ac• -ft) Discharge (cfs) Tnfi.lt (cfs) 0_fG CIO 0 0.027 111. C-00 0.020 0.00 0. t`n4[, 0.02'01 0n01 0 . 003 [4} 0. 6889 0.027 0.002 0.004 r0.000 0 .000 0.'13:33 0.027 0.003 0.0v5 0.000 0.:€.7.78 0.027 0.0104 00.':56 0.000 0.2222 0.G2 7 0.006 0. .0 7 0.0!00 0. 2667 0. D2 7 0.00-1 0 .:307 . a 0 55 7. 31.1,1 0. 027 0. 008 0.0108 0. 000 0.3.356 0.027 0.009 0.008 (].000 7.40 ;0 0. 027' 0.:31.0 0.009 0. 7,".0 0-444.4 0.02'' 0.=01.2 0.009 0.000 O. 4899 0 - 02'7 0. 0-' 3 0.01.0 0.001-11 0.5333 0.027 C.() 4 0.010 0.007 0.5778 0.027 0.0-5 7.07.: 0.:.'00 0.6222 0.027 0.0-1:7 01.011 0.000 0.6666'1 0.027 0.018 0.012 G-000 0-7111 0. 2`7 :3- -9 U-01.2 0.;3rf� O. -)5S,6 0.027 0.020 0.71.2 0.0100 0-80010 0. 02 f 0-021 0-0.L3 0.0100 0.8444 0.02-7 O.023 [3. 01.3 0.000 7.8889 0.'327 0.0.2.4 0.013 7.000 0.9333 0.027 0.025 0.014 0. Holl 0.977E= 0.027 :7.,726 0.Oj4 0.70 1. 0222 0.02' ',1. 0. 01.4 3. 000 _..0667 0.02_7 0.079 s-01� �.[Ois 0.027 0-0.30 0.0 5 0.00[ ...756 0.027 0{.0'3]-7. 0.0 .5 0-0'00 :-2000 -2700 0. 0 l.. � 0.032 0 0 016 0.001-1 2 k x4 0;.027 0.0.33 0,.G.!.6 0.000 ...2889 0.027 0.035 C).C16 0.000 1.3333 0.0127 0.036 0 . 0 :.7 0.0010 t.3";'78 0.027 0.037 0.01"? 0.000 1.. 4222 0.027 0.038 0-021 0.007 .4667 0.027 0.040 :7.024 0.000 . 57.1.:.0.027 0. 041. :7.026 0. 0.,0 _-5556 G.0°?7 0.042 0.028 0.0.00 1.6000 0.027 0.043 7.030 0.000 1.6444 0.027 0.044 7.03'•_ 0.000 1-69913 0.02 7- 1'46 0.033 0.000 1.1333 0.027 0.047 0.034 0.000 _.7778 0.02'? 01.048 0.0.35 0.0010 ?.8222 G.G2'i 7.049 0.037 0.707 86670.02. o. mo 0.038 0.000 _.9111 0.0'27 0",2 0.039 0.000 _ . 9,- f607_'' 0:.053 C, . 040 0 . ] 07 2.0000 0.027 0.054 0.041 0.000 2.0444 0.92': 13.055 OA42 0.000 2.0889 0-02.7 0.`057 0.043 .,.000 2.1333 0.027 0.058 0 044 ,.0'010 2.1778 0.027 0.059 0.045 07.000 2.2222 0.027 0.06110 0.045 0.000 2.2667 0.027 0.061. 646 0.707 2 . 3 111 0.027 0.063 0.047 0.000 2.3556 0.027 7.764 o.048 0.000 2.4000 0.027 0.765 07.049 0.070 2.4444 0.027 0.066 0.049 0.000 2.4889 0.027 0.067 0-050 0.000 2.5.33.3 0.0,27 0.069 0.051, 0.7011; 2.5778 0.02'' 0.0")0 0.052 0.000 2.6222 0.027 [, . 7"? ]. 0.053 0 . 000 2.6667 0.027 0.072 0.753 0.000 2.;'11.1 0.027 0.073 0.0.54 0.000 2.755E 0.0.2.'1 01,.075 03.055 0.000 2.8000 0.027 0.016 0.055 0.000 56 2.8444 0.02'i 0.077 01 10 6 0).000 2.8889 3.027 (1.0-8 7.037 C, .000 2.9333 C;. 0127 0.080 0.037 'J.000 2 . 97"18 ., ..32 7 0 . 081. 0 . 0, 58 0-000 3.0222 C..027 0.082 0.039 0.O,Cw 3.0667 0.027 0.083 0.059 0.000 3.1.1.1.? V. 127 0.784 0.060 0.700 3.1556 [7.02'' 0.086 0.051 0.0100 3.2070 0.02"", 0.087 0.05:1•_ 0.0000 3.2444 7.027 7.788 0.062 0.00 3.2889 0. ;27 0.089 0.062 0.0: 0 3.3333 0.027 0.€190 0.063 0.000 3.37"i8 0.027 0.092. 0.064 0.000 3.4222 :1.027 0.093 0.064 0.000 3.4667 X7.02? 0.094 0.065 0.000 3.51.11. 0.027 0,095 0.053 0.000 3.5556 556 0.02 1 3.00 ? 0.066 0.000 3.6000 0.027 0.098 0.06"? 0.000 3.5444 0.0.7.7 0,099 0.05.7 0.000 3.6889 7.027 1.100 0-.058 0.00[1 3.7333 0.027 0.101. 0.068 3.000 3.7778 0.02? C-.103 0.069 0.007 3.8222 0.027 ,..104 0.069 0.000 3.8667 0.027 C;. 05 0.070 0.:J00 3.9` 11 0.0��2i' 0``.106 0.082 00.00`.1 3. 9556 0.02 7 J ..1.0'? 0.198 ` , 0.000 4.0000 0.07..7 0.1-09 0. 3 7 9 7 . L;00 4 _ 044`•, 0 . 72.7 0.110 0. 60-7 0.000 4.0889 0.000 0.00111 0.872 0.7'00" Name C. -ravel T3"f,'dich `Sed No-" -h Bottom Length: 77.47 .ft. Bottom Width: 22.73 'french bottom slope 1: 0.001 To 1 Trench Left side slope 0 : 0 To .1. Trench right side slope 2: 0 "o 1 Material thickness of first layer: 0.75 Pour Space of material for first layer: 0.4 Material thickness of second layer: 3.73 Pour Space of material for second layer: n.62 Material thickness of third layer: 1 Pour Space of material for third layer: 0.4 Infiltration On Infiltration rate: i.8 Infiltration safety factor: 0.4 Discharge Structure Riser height: 5.5 .i: t. . Riser Diameter: 1.0 -r,. Orifice 1 Diameter: 0.01. a..:. Elevation-. 0 f t . Element Flows To: Outlet 1 Outlet 2 Vault 1 57 58 Gravel. Trench Bed Hydraulic Tabl.e Sta e (ft) •Area (aQ) VoiLzme (ac -ft) Dischar Q (cfs) Ynfilt (cfs) 0.c0c 0.0 40 7 C, 0 . COO 7.300 0.0611 110.0410 ...001. 0. {;0110 0.029 0.1-222 0.040 0.002 0.000 0.029 0-1833 0.040, 0.003 0.000 0.029 0.2444 0.740 0.004 0.0100 0.029 0.3056 0.040 0,004 0.000 0.729 0.3667 0.01,10 0.003 (].19011^ 0;.029 0.4238 7.040 7.006 0.000 0.029 0.4889 0.040 0.00`? 0.000 0.029 0.3-500 0.040 0.008 0.000 3.029 0.61.-111 0.040 0.009 0.030 0.029 0,7 . 11'122. 0.040 U - 0'1.0 0,000 [. 029 0.7.33.3 0.040 0.011 C.7C}iJ C .02 0.'79441 0.043 0.01.3 0.000 0.029 0.8556 0.040 0.014 0.000 '1.029 J.9167 0.047 0.01.6 0.000 1:.029 0.9'7'78 0.043 0.07.8 7.000 0.029 .0389 0.04s 0.019 0.0 0 0.029 1000 C.040 0.021 0.0100 7.029 1 ... 6 1, 0.040 0.022 0.000 7.029 1.2222 0.040 3.024 0.000 0.029 1.2.833 0.040 0.725 0.111300 0.02.9 1. _3444 0.:340 i?.02 r 0.0003 0.029 1 . 4056 0. 11)410 0. 028 0. GOC= 0.029 1.4667 0.040 0.030 -.. 000 0.029 1.3278 0.040 0.031 0.000 0.029 1..5889 0.040 0.033 7.00:; 0.029 1.650: 7.7x7 0.034 0.700 0.029 1.7111 0.040 0-;)36 0.2011 0.029 1.. , '72 0.0410 0.037 0.00:7 0.029 1.833.3 0.040 13.039 0.00:) 0.0.29 1.8944 0.040 0.041 0.000 (1.029 1-9556 0.040 7.042 0.000 0.029 2.01167 0.040 O.C44 0.007 0.029 2.0778 0.040 0.045 0.0,0 0,029 2,1389 0.040 O. 0!!'11 0. Ou0 0.029 2..2000 01.0340? 0.048 0.000, 0.029 2.261.1. 0.740 0.0.0 0.070 0.029 2.3222 0.040 (1.0151 0.000 0.029 2..3833 0.0,40 0.053 0.000 0.029 2.41444 0.0140 0.0534 0.300 0.029 2.50-56 .740 0.056 0-000 0.029 2. 5667 0.040 0, 057 0.7Oo 0.0219 2.62'78 0.040 0.059 0.000 0.029 2.6889 0. 040 0.06'0 7.11)(110 0.729 2.75003 0.040 0.062 0.0017 0.029 2.8111 0.040 0.064 0.000 0.029 2.8722 0.040 0.065 0.0010 0.729 2.9333 0.040 0.,067 0.000 0.029 2.9944 110.0401 0.068 0.000 0.029 3.055-6 0.040 0. 0'70 0.0-00 0.029 3.7.167 0.040 0.0'71 0.000 0.029 3.1775 0.340 0.073 0.0'00 0.029 3.2389 0.340 0.0114 0.003 0.029 58 3.3000 0.040 0.076 0.000 0.029 3.3611. 0.040 10.077 0.00101 0.029 3.4222 0.040 .0.;179 0.000 0.029 3.4333 0.040 0.080 0.000 0.329 3.5444 0.040 0.082 0.000 01.029 3.6056 0.040 0.083 0.000 0.029 3.6667 0.040 0.085 0.000 0.029 3.7278 0.040 0.087 0.0100 0.029 3.7839 0.040 0.0.88 0.000 0.029 3,8500 0. 040 0.090 0. 0:30 0, 029 3.91.11 0.040 0.1391 ,1.000 0.029 3.9722 0.040 0.093 0.0:10 0.029 4.13333 01.040 0.1094 0. 000 0. 029 4.0944 0.1740 0.096 7.000 0.029 4.1.556 0.040 0.097 0,000 0.029 4.21_•.67 0.040 0.099 0.000 0-029 4.27'73 0.040 0.100 0.000 0.029 4.3389 0.0,.40 0.102 C.:O`0 0.029 4 . r 000 0.040 0,.103 0 .1x00 0.029 4.4611 0.040 0.175 0.000 0.02.9 4.522'2 :].0,40 0.1i,`6 0.000 0.029 4.5833 0.0113 -.-07 0.0001 0.029 4.6444 ,..040 0.103 0.000 0.029 4.7056 O. 1740 ..109 0.000 0.0329 4. 1667 0.040 3.1 a 0.000 0.029 4.82."18 O. C4:7 0 . 1 "... 0.000 0. 01.7.9 4.3889 0.040 0.112 0.000 0.0,29 4.95CO 0.040 "..1'-3 0.0007 0.029 5.0;.1,11. 040 0. 1.' 4 0. 000 0.029 5.0722 0. 0141, a.115 0.000 0.029 °_3330.040 0.116 :.0,00 029 5-1944 0.040. 0.111 O.Oco 0.029 5.2556 0. ()40 O. i-8 .1.0,]0[; 0.729 5.31.6'7 0. 0 30 0. 1i 9 01.0100,3 0.029 5.3778 0.040 0..1.20• 0.000 0.029 5.4339 ;.040 0.1.21 01.000 0.029 5.1000 0.040 0._22 0.000 0.029 ANALYSIS RESULTS Stream Protection Duration Predevel.oped Landuse Totals for POC #1 Total Pervious Area:1.28 Total impervious Area:O Mitigated Landuse Totals for POC #1 Total Pervious Area:0.657 Total. Imperious Area:0.623 59 Flow Frequency Return Periods for Predeveloped Return Period Flow(cfs) 2 year 0.037633 5 year 0.0L59104 10 year 0.07-.272 25 year 0.0841,63 50 year 0..09214 100 year 0.098925 Flow Frequency Return Periods for Mitigated. Return Period Flow (cfs) 2 year 0.03351.8 5 year 0.0481.72 10 year 0.05893. 25 year 0.0'73'743 50 year 7.08-5677 100 year 0.093391: Stream Protection Duration Annual Pears for Predeveloped and Mitigated Year Predevela ed A�zti aced 949 7.037 0. 028 9 51 0 0.046 0.035 19^ 0.083 0.060 1952 0.026 0.022 1953 0.02:1. 0.022 ,.0J 0-032 '0. €331. 1.955 0.052 0,044 1956 C.C47. 0.036 _957 0.033 7.034 '.958 0.037 0. 0.30 w0.9 0.032 0.022 1960 0.0,,56 0,057 1.961 D.032 0.0.31 :962 3.020 :0.02x0 1.96:3 :3.:327 7.030 "964 0.3.36 0.026 -96:3 0.025 0.032 1966 0-024 0.021 1:367 fl) .,]51 0.0"40 19688 0.032 0.028 1969 0.031 0.026 1,970 0,026 0.025 1971 0.028 ... 039 1.972 0.062 0.046 1973 0.028 0.022 1974 0.030 0.025 1975 0.041 0.042 -976 0.030 0.032 97? 0.004 0.020 1978 0.026 0.030 199 z'. Ci❑ 0.024 -980 0.056 L. A 1981 7.023 0.027 1982 0.0x5 9.067 1.983 0.040 0.038 POC #1 POC # 1 POC ## 1 60 1984 0.025 0.021 Inas 0,015 0.026 1986 0.065 0,054 I987 0,058 0.059 1 0,029 0.022 I9B9 0.015 0,019 lege 0.121 0.071 1991 0-.0, 0.062 1992 0,028 O.023 :e9a 0,029 0.022 1994 6.010 0.016 2995 9.042 0.039 1596 0.088 0.057 2997 0.024 0.061 1998 0.017 0.026 1599 0,069 0,046 2090 0.029 0,033 2001 0.005 0.025 2092 0.032 0.056 2003 0.041 0,025 2 00 4 0.053 0.076 zoos 0,032 O.OS2 2006 0,045 0.038 2002 0.090 0.073 20-08 '.116 0.029 20;ee 0.0570.054 0.0366 Stream Protection Duration Ranked Annual Peaks for Predeveloped and Mitigated. 20c #1 Rank Predeveloped Mitigated 1 0.12236 0,0792 2 5.1155 0.0264 2 0.0595 0.0733 4 0.0882 0.0709 5 0.0829 0.0669 6 0.0737 6.0624 2 0,0226 0,0612 8 0.0691 0,0596 9 0.0652 0.05B6 10 o, 0612 0.:572 II 0.0- 0.0572 12 0.05; 0.0564 13 10,056? 9,0544 14 0,0562 0.0543 15 0.0527 :,0479 I6 0.0517 0.0464 I2 0.0512 0.0459 la 0;.o461 0,0!39 15 0.0650 O,C418 20 0.9446 0.0401 21 0.0418 0.0391 22 0.0412 0.0385 23 0,0412 0,:376 24 0.0407 0.0376 25 0.04:9 0.0366 26 G,oa?B 0.0964 61 27 0.0374 0.0352 28 0.0370 0-0340 29 0.0355 0.0331 30 0.0332 0.0324 3x. 0.0324 0.0323 32 0.032- 0.031.1. 33 0.03-'•_9 C. .308 34 0.0319 0. 3 02 35 0. 0 316 0.()2..98 36 0.03.2 0.0297 37 0.0304; 0. 0283 38 0.0298 0.02'i8 39 0.0292 0.0272 40 0.0291. 0.0265 41 0.0260 0.0262 42 0.0230 0.026- 4:s 0.0275 0.0259 44 0.02'70 0.0253 45 0.0262 0.02:5"3 46 0.0261. 0.0250 4 1 ,].02.98 0.02�0 48 0.0255 0.0237 49 0.0249 0.0229 50 0.024-5 0.02.21 51 0.02.34 0.0219 52 0.022: 0.0218 53 0.0211 0. ;217 54 0.0197 0.0215 55 n.0 16 0.0213 56 0.01.58 0.02(36 J 0. i?1.49 0. J'204 53 0.0148 0.1;199 59 3.0098 O.C198 60 0.0052 0. 0190 61 0.€;03` 0.0160 Stream. Protection Duration POC #1 The Facility PASSED The Facility PASSED. Flow (cfs) Predev Mit Percentage Pass/Fail 6'. ,, i Bg 7.7567 8290 47 Pa s 0.0196 16170 7422 45 amass 0.0203 1.4974 6793 45 ?ass 0.021-1) 13858 6280 45 Fats 0.0218 12810 ;893 93 Poses O.C225 1.1815 7580 47 T:'a38 [].023:3 10898 5322 48 Pass 0,0240 1-011.9 5120; 50 pass 0.0247 9383 4939 52 Pass 0.02.55 3731 9753 54 pass 0.0262 3145 45,43 55 pass 0.02..7 1 759.3 4359 `.]7 Vass J.0271 -7niS v1 h1li% j8 :.'a s 62 0.0284 6590 3951 60 Pass 0,0:292 5149 3''75 6 1 Pass `„'.0299 :5761- 3785 62 Pa S's 0. 0307 34:33 3 473 Fit 'a: Y 0.0314 5101•.. 3723 63 Pass 0 . 0 3 2 111 4908 3059 63 Pass 0.0329 4528 2849 6. Pas,_ 0.0336 4254 2C51 2 62 Pass 0.0344 4017 2470 61 .0351 .3782 233::. 1 Pas, (3.0359 3546 2199 62 Pass 0.0366 3337 -091 Fit T,ass 0.0373 3'38 1919 63 Pass 0.0381 2952 11.084 6.3 Pass 0.0388 2785 1 776 63 Pass 0.0396 2599 1696 65 Pass 0. 04 v3 2447 -16013 65 . ass 0.0410 2304 15:i_2 65 P a S 0.0418 2162 ?,437. 66 ?ass 0.0425 2026 1332 66 Pass 0.0433 1899 ;_274 6 7 Pa,.s 7.0440 ;.790 ...:194 66 Pass ,,. f344 ;' 1688 _116 66 Pas,, 0.0455 1386 1.033 65 PasS 0.0462 J.483 959 64 Pass 0.0470 1379 383 64 Pass 7.747? 7.292 817 63 Pass 0.7484 :1217 "76"1 62 Pass 0.0492 1154 "71.0 61 Pass ;1.0499 1098 650 59 Pass 0.M011 1048 585 :5 c5 F, a S , 0.0514 997 531 53 Pass 0.0-521. 9,30 486 52 Pass 0. 329 88:3 428 48 Pass 0.05.36 83'.' 387 46 Pass 7.0544 789 -354 44 Pass 0.0551 '14:3 323 43 PaSS 7.0558 7.13 294 47. Pass 0.0566 660 258 38 as:: .,.05,3 631. 234 :3' PaSr G . C-58 59 212 :35 Pass 0.0588 165 1.93 .34 Pass 1.0596 `3:39 171 3. L=aSS 0.0603 496 154 3' µass 7. 0610 473 144 30 Pass 0..06:_7 434 135 31 Pass 0.0625 399 1.24 31. Piss 0.0533 365 1. 14 31, PasS 7.0640 348 107 30 Pass 0.0Ei4"? 323 95 29 ['ass 0.0655 296 86 29 Pass 0.0662 272 ?:7 2'7 Pi --F, 0.067 256 68 26 Pass 0.0677 235 62 26 Pass 0.0684 2 € 7 57 2.6 Pass 0.0692 1.95 46 23 Pass 0.(;599 180 36 20 Paso 63 G_0707 `.8 26 -7 Fla sS C. lwf-4 C,u;ifillaltive, 26 ..I Pass 0.0721 17.9 22 17 Pass 0.0-,129 119a Ne ci Through s 0.036 109 v' 9 Pass 0.0744 97 z a5: 0.77.1. 91 h 5 Pass 0.0758 82 4 4 ?ass 0.0'766 '16 2 2 'Pass 0.C'173 69 2 f: Pass 0. 07 8 1 61- i -F �'aSs 0.0738 34 ! Pass :).0} 91 48 C G Pass 0.0803 41. C C Pass 0.08 v 38 C C Pass 0.081.8 33 C C Pa_ -S 0.082'5 2'i 0 C P=ass Q.093-3 22. C ]- 0.0840 21 C C Pass v.0847 20 0 0 Pass 3. "JE35`., 9 C 0 Paz s s 0. :862 17 0 1 Pass 0.0870 13 0 0 Pass 0,087") 12 0 0 Pass 0.,;894 8 0 0 Pass 0. GHQ2--, n 0 C Pans 0.0899 3 0 PaS� 0. 0907 3 : as'. 0.0,91.4 3 C 0 as, 0.0921 3 C C PASS Water Quality EhLP Flora and volume for POC 01 on-line facility voli=ee: 0 acre-feet On-line facility target flow: 0 cfs. (adjusted for 1.5 minx 0 cfs- Off-line facility target flaw: 0 cfs. Adjusted for 15 min: 0 cfs. I'M Repo+ -s_ LID Technique Used Tc.r. Totc:l Volumn Volt_s_ infiltration C,u;ifillaltive, r?ercerl` WatE:r Quality Percent C ornn--nL" T.reatx.eTO.-:' Ne ci Through Vo_Lllili dfl-i3 L Vpl',lnr] water Qllal.i ;_V "reatment. FaY ,aG-f'-+ Itt-llt.r-az.a-o:A 1112 1tr•ated Treated (ac -ft} "ac- fl) _..........._--- ::;re-dit i3?tch P N VdLi.i.t € N 56.8 N G>ave.I. .'reach Bed North IN is, .�8 h 5,.35 Total. Volur:ie 1n il`__oared 203.36 0.0(: 1) 31.'15 [:. [:0 p; Na Treat-. Credit coupliance w .t.h LII 7ta dard 8 Dura!Lion kAna.ysas -tesu.lt - Failed 64 Stream Protection Duration Predeveloped Landuse Total Pervious Axea:0 Total Impervious ?area Totals for POC #2 A Mitigated Landuse Totals for POC ##2 Total Pervious Area:0.34 Total Impervious Area:01.28 Flow Frequency Return Periods for Predeveloped. POC #2 Return Period Flow(cfs) 2 year 0 5 year 0 10 year 0 25 year 0 50 year 0 1.00 year 0 Flow Frequency Return Periods for Mitigated. POC #2 Return Period Flow (cfs) 2 year 5 year i 10 year L 25 year 50 year 100 year 0 --- - -------------------• Wates Quality RNP Flow and Volume for POC #2 on --line facility volume: 0.0452 acre --feet On-line facility target flow: 0.045.,4 cfs. Adjusted for 15 Irvin: 0.£454 cfs. off-line facility target flow: 0.:25.1 cfs. Adjusted for 15 m+n: 0.025.1 cfs. Water Quality B14P Flow and Volume for POC On-line facility volume: 0.0474 acre-feet On -.Line facility target flow: 0.505101. cfs. Adjusted for 15 min: 0.8501 cfs. Off-line facility target flow: 0,027% cfs. Adjvxsted for 15 min; 0.3278 cfs. Perind and Tmpind Changes No ct,lange s gave been made. Tkvis program and accoTpanyir_g doeucrenta:ion are p:raNri. eo. as-i.s' wi'•�r•o�!_ wirra_aty of ar_y kind, The entire r.isti re -the performance and resi:lts or thj.s prcgra*r, is asszmed ky End User Clear [,reek Sc]-ut-rots Inc. and the governmental- 1.. cer--wee or Sublicensees di claim a1.1 wari-a .t.ies. ei t.her expressed cr i:r--p'_ J ed, ° ncluding b ,t not limited to iruplied warran ies ci' precrr-am and ac-corpar:yir_� doc:rmentati-on. 7n no event -,hall Clear Creek Solo inns tint. sae liable tor. any damages w:_rLsoever {incl d`ng w',.t^out .;.i.r:i at.ian to damages cr :1-oss of --us.i-ness p.r.a:i.ts, 1. ,ss c- busi.r:ess information, bus .ness _ntex rup?.--.ion, and the like] arilsing out cf `he use of or i.rvab.i.lity _o use ":1 -Lis prograL-m, even zf, Clear Creek sol'ations Inc. or. their a:zahora.zed representa.ti yes have bee% advised r,f t:he+ possi Lil i ty o3: such damages. io` Ware Copyright :c� by Clear Creek ,_ l-u`i.nns, .Inc:. 20:05-2013; P.11 Rights Rese.r..ved. 65 " r���^—CDNIsFC? TO ..... ExIST,kG RITCri •• CgNfBiNiwA AkFE<HTEON i WET VAULT - ....... SEE NOTE AT LEFT .. ........ i .... ............ ... ................ .. ............ .. .... € I f_ .... .. .... .... ..-..... EXISTING TREE TO RE36AIN (TYP) i Cg676H6CO oj£TEN':EPit 1 WET VAULT \ - tib ,$1 {•1PC €} / - .:. _ i..•4......f.....:....... SEE nk4EET PGS FCR DF.TAgI S - . •••'^• ••••• ^•�"'-'"r'"' •^••• •^•.• qq --- ZV rl `:00 YEAR DETN'10N WA -TR SERFAGE Ff.. = 401,5C E �[ � /f '+ W TOP WQ EL. = 357.50 �`_._ - CEI #13 {TYPEY1I) BO?TOM WQ EL. = 393.5C 'm . ... ....-------_- ----- - gL7KT CRS 2C'35-4 4R t f - REWIRED DETENTION LIVE STORAGE: u 4,4360 Cr APPROVED £[?JtVA'�'-'�T �• �� PROVIDED RETEKT[ON LIVE STORAGE s 4.752 CF ; ------ f ..�. •a[, ; FOR PRE--TREAWENT SEE REQUIRED W'R DEAD STORA`CE = 2,D65 Cf co • 3 e *TOTE' AT RIGhiT. .f _ ; PROVIDED WQ DEAD STORAGE = 4.75.2 Cf Y [ ` 5 TRACT STUN A Ff I "�vl !� 7gMUNE (TSP) INV. 6" Cs`. NE) = 34I3.OU i I 'R1 ; ..l f-11 L �- ! r., v Cii N...Ew B" �s ❑x'31'1 : -Y zga.n LST 3 . .../...........r w u c zo as INV. (72` SE) = 598,00 $ ...{ ...:.::.: .:+ -w...- ..... ------•--.- �. M .....1... ..... ...... .. 1:. ... -.... �� .. ...e.oro s+..... 1 }•- 12" FLOW f.DNTR0. R€SER OVzR>iJW EL = 4€7s.5f; _, �: { - - w ,�;P�..� - >' CR Al'; (•[YPF I] ...i ¢ INV. I2" DllT (SW) - 397.50 [ , h --- - o _ - [ CB #12 (TY --E I) Q ....i RO E TpM DR[�tCE EI.. :585.50 .:f_ - _ �- _�. - C "NC SCALE Z) STORM (. �- BD" t'Ow OHif3C£ piA, �, 6.75 (3/4`) E...* -•J ]-- 2ND 9TEIFICE 4" -EL' EL. _.158.9£'. ^ __. �.. "". W-- --, F-- --- i '".2Q' 2NI) ORIFICE DIA. � 1.£70" '- � JH.JO 1 DRAINAGE EASE3Al-•1�i'r1' t 1HFII.Ti7ATEgE3 SYBTEIYI _ 1 ; 4 STDRM'IEC:N VC•-35GO CLEAN. C iiSNEO ANCUL4R, STONE SE:3 517.E ......... CB QIP" t I I • +• iv tNEri 6" � 472 I-- -�- --- •-- �- -- - - -- --�...-•------ i .. .......... .. ... ............ .. .. ... -. - CH 5 TY+E E 1� C H {LL a,, a; •` �7 C ) _ 77.5'L X 22.75'Sy H 5.5'H W/ TOTAI, 3D G:9A3ABER5, ` `t" ..`TOR • --- --- - - -- -- ... --- - ..� _�...... ^. - •-- - - W et_2s' --- T- ' 3 END CAPS. 3 ROWS - 6- E &SOLATION RDri, TiYD I '- -' --- --' .T�) Z € f I• S c'I --- -- - --- _ ' `, iNFIL hRATSON CHAMSERS SEE SHEET PGO. r07 FOR DETAILS L'3 #3 {TS'PE { It.'] {j[ i € CB #1 `.• ;'Yt"n I} i'i •--?CRAKE flF ACCESS ROAD, [,,, I ; i TryTAi. L[VE STORAGE REQUIRED = 4,96s GF' TOTUVE STORAGE PROVIDED = 5.9F0 CF '` v A Ai. SYSTEM OVURFLOW Ev - 412.15 Z. LOT LOT 5 1 ] ] I I � �' a 5.364 5 •[b{ 1.y 5.015 5F [ I SANlCJT EX. ASPHALT PAVEMENT [T1"?} ••I :_ :-.�'-i- `7'!. - } LOT - LOT 1 's ... ....... . --. 27 l.f' fifFELTRATEOIi...� n t `•` y ] TAENCH 42 (SEF DETAELI j rase i _ I j s 504 sr ! '( 1 -•': f ! SHFET P'D5 ',YP.) E I�--•--F3NFILTRATION SYS TETR .. ... .. .. :.:. ....: .�...... - �� r hg .i-.....; '; EE NOTE. THIS SH3w_. j 1O `TYP g. r:r LL - 71 w.-i�-- - ---- _ tl C3 p(TYPE ii} R 7CTri E ! ,, I ��'`� � --- _ �• � j � � �}}. 7 I� L N. 7 .. .. 7 i. h. I S SF, O'er' ti.. -4 F • N .................... _ N C7 ui C/} PROPOSED FEATURES Sa• •- PROPGSEU STORM i7:4AIN YfAE .-.-.-.-•••SS•-------- P2pPCSED SEH'ER MAIN -__-_-_-.sy.................... PROPOSED WATER MA[N LOT PROPOSeJ LOT - PROPOSED SAK4) i LOWE U) PROP050 DRfPUNE 1r�L CURD RAMP PROF©SM AS'r HAL1' PAVEMENT -----...µ OPOPOSM VOEWALK ....�_._-_.,...... RO;i'NOARY / R.O. W-- UNE ----...-. JOT LIVE Gurre.R. [low,, do i,T,'ft[ U --NE --' --"- ----- EASFMEN?' UNE -_ _• M �.. — 81ALDI.G $ T3AGK. LINE (&SR.) fO' EASTrrrr. CONTUURS 2" E(TSVNG CONTOURS -----•s'n-- - fO' PROPOSED CONTOURS 2' PROPO5Ef7 CONTOURS Pacific 25yj rjj.rjE� Cl 'low 0. LymRENTON - .. - ��.��%.i� .✓ 1 � 3 s A. LY wt wa i DATSiS ie o.acn �,�su,:"� Plcni=-i�g/Ru':sdiazg/Pub1:c Niorts Dep: - f^ '� �-'- ' ' ' r Ciu3i �rtaliri� •rir�1 ? 1 w Fi17G BY DATE ItPPR �O. Fi77a Z- IL IN COMPLIANCE WITH CITY OF RENTCN STANDARDS � U) 0 2 fl 4 _ G R E E N'S LANDING SHORT PLA 1 tF 2618 � c IIJ PRELIMINARY GRADING AND DRAINAGE PLAN w � a PR2�O8 [� I MC -3500 TECHNICAL SPECIFICATION ZZ 86-0" (2164 mr,H STITIEH'. R fN�TALLED z 1:R� YVEe 5!rlFEN9, ; M LUVER JGIH' 1 ECRkNI TION 3 ? II�FR JrNNT Gt/.9x�[:n'iCN FwL�RC/✓INr U=E. Mft „ ss.o" 0171 _s rr 7-, _4 07. IT.m) P E- "All A 11143 r:n (ET . '2286 mvr� AG riAL _ENG'f H NOMINAL C14AMBER 5EEECE.�A„..h:, SIeE(VIA is%I TA:LEG LFNMNJ x ZDtr X We L1968 Tn x3153 rn, K 2184. •• rNnbE4.^,T�R,tiE 9s.5 :-64 EFEr 99.2E"[� RnA MINR/--n:s`nL!Eo3YC.in�E• 9iA.9 :INF: FEET [+.+Nin �' WE9GRT :T'.0 bs- 1e1.nN F'��8HE� CPA6�_ABOI r. NDTF, THAT ... r11-G1ik1 rr.Qv " ��y~• �• "0.5R-F:i N IrrSrA:I�C LR. Grua -o-x uL�xO [ lyssmr.,x:1c mT.x5r1 RAn ENS CAP.'.YLN9rf�C ?C.a GJBh: `EO L�.93 sr+; d11NSR-�'A 'sSAli.Fo S: �PN�E• 08.3 CAS:=ELT [1..TN6 5 s.)NE ;B' LAY. R} TO 24' IsGG mm; P33GVE'Rc T(?.� OF x,�:c o-N,AI u'2.r ani r 1- ,_05R E:.a V..T q;2 :,v-ry �fuA ',, vO NAY -AHD NEINWIN v'-1-ASTe•F5 1T [.rF_. J.S.TME?=31A1>-EF IN FRPT SF' ENO EA:c. 34M�bHN ECAC IY si:J3�Ar bOTTw.![aF EN] CSR RJR RRR'r N'J'.15F:P: F.NCUs: w1Ts�•N• PART# STi€E3 B C ""'tiLI�AT]S� �" •PENAL F LL:3ILL t FOR ELJ:YER'D' STARTS FRCAI TF IE TOP OF 99.2E"[� RnA ... ••� MCY,O,:ICVA06B 6^ ; sr nrnl �__-- n'n5 •-^ ""ilcxu:IE�xver F'��8HE� CPA6�_ABOI r. NDTF, THAT ... r11-G1ik1 rr.Qv " ��y~• �• "0.5R-F:i NCSSNIEr50t6 PAVEMENT SUBBASE MAY Bi PART 12. (Nr:xn)MIN P€ZF.n.ARAT:O.'.` RF4i31FfEh4E'J15- , .1cawME�rwr >ncSxclErr•:n r.n zs.oc;z:ss �ml - alc:ss�-.le,sar 5 s.)NE ;B' LAY. R} TO 24' IsGG mm; P33GVE'Rc T(?.� OF x,�:c o-N,AI - - p1�J=_R3IERP'23-. 'TiiE CF=AMBER. NO THAT PAVEMENT S:;BI3ASE'NiY BE A?ART OF TH='C' LAYER- M:JS7 YAVL�'IEKi SUBi1A5[ MJ11"ERI:�S CAN 3C USED 1N LI'cll OF -HIS LAYER. AASF."TO!ld31 IIIEN3ETY FOR `11'BLL GRADED 3, 3:T. d, A87, S. 55, 57, 6, E7, ti8, MATER AND 35YE RLi11..Ve T. 78, 8. 119, 9- 10 JAG SRE FOR O'ES +Ic3NocIR Prue +"] SD M 1[nonEHv%5S " EM F3EE}41 F:N'F STphLF; F3LL - 3-`�5' [3B PIN _� '�1�fC 18' f9`�•h-i 2123'iW'i mrYp •••~•• a1C�'�O'u qa 29':Ftr3839Y 3 4 A €ra THE'c LAVER AaovE ODNDA11UN STONE FTCLL51h :C: AMSERS FROM THE SVBGRA.DE UP CiFAN. CRUS}`.ED, aY•1G:1LAR -,,ONE AA'Sii"7 €x143' LAT:, COMPACT URTACE O 3,4 ACYSIEVE A FIAT 3V£Z AC=- * ` "�.13YE PRrcCR�t xl'.'Ck'S ARe AVFLABI_n Jf JH R_GNRSr-;NttENr[,x�FHN IfCLI m[cEt'LY '2-35'[=K}6CL'rm]`- E DN sll_. AND :sate ;]Ti -1 L: err .ZKMr,. K"F1 I.M Ci3T.'M1 iN> <RT I.ECA7 rN5QN TRE AIF w ENO -AP _": IN TNC FI'el_�: E\dT sECGMMENw.t 'C% PITS_-.81ZES GR EATER THANi2`.o m'r'1 'rNs:HVERT AC FjGN IN CCLJMy'B ARE T E. R!GFTF5` n--E.sIP:� Fr:H Uil V:PC 51ZrL CATs, y BASIN OR MANHOLE SUMP UE2Tii r3D 3Y DESIGN EN'CONEER 22-5" (5711 m N i N3TALiED Fru I �I' COVER ENIIkE ROW N3TEi AASHT:J h5286 C€1+$57,. NON-VVOVLN GLO EXf3LE- A•1C-J50G • 12. C+ #3.81 r.31 Y+ICF STRIP ACCEPTABLE FILL MATERIALS: STORMTECH MC-3500CHAMBER SYSTEMS ( 'ti1ATGR€AL LCCRiON ❑e5^RIP"EON `- PASHTO r4LAiFF[IAL C`JrV'.PA;:7SON I CLJ+SSIF�ICAT[ONS RT_ ]"RE'ME Nr c •PENAL F LL:3ILL t FOR ELJ:YER'D' STARTS FRCAI TF IE TOP OF [ �k%'Y i PREPARc PER SITF. DESIGN c213:4'EER-S P€.1N3. PAVED D •rFiE •O' I,AYF.R TG THE GC T3M OF 'FLFLXIB_E PAVEM� NT OR LNPAVL•D SO;l!FOCK OAA?-ERI,'�;,5, ky T1VF. SDI LS- DR i PIER FIN, 1INFER'S PLANS, C-riE4�'K PLANS FCR [tiA ENSTALLA-,10N5 MAY HAV= -•r= F'��8HE� CPA6�_ABOI r. NDTF, THAT % PAVE MEET SV`3GRADE REQUJF BEME1NTS. STR;NGFNI 7NFl cFGAL AND PAVEMENT SUBBASE MAY Bi PART 12. (Nr:xn)MIN P€ZF.n.ARAT:O.'.` RF4i31FfEh4E'J15- , ENI TIAL FILt.: F11, MATERIAL FOR'• LAYER T7 S FARTS FROM T:� TDP Gy: -rAE3ECEFLNT = GAS ANULAR 1tAEU, .;RAI=D Sol LFAGC-REGAT� �'1€Xl'llRES, 75% •FINES OR PR:Y'F.SSED RASF!7O:a9145' =EG1 'C%JSAC i1' . S AFTER 24'(!51)13' rrc.) OF MATERIAL OVER THE A^1, Ar2�1, P,3 CHAM8ER81S Si AC-H5O. C-OYtWPACT As7D[T€ONAL LAYFRS IN 12"306 mr. is 5 s.)NE ;B' LAY. R} TO 24' IsGG mm; P33GVE'Rc T(?.� OF AGGREGATE OR MAX LI_ TO A Erik. 95`/, PRO,.'TOfR 45" 'TiiE CF=AMBER. NO THAT PAVEMENT S:;BI3ASE'NiY BE A?ART OF TH='C' LAYER- M:JS7 YAVL�'IEKi SUBi1A5[ MJ11"ERI:�S CAN 3C USED 1N LI'cll OF -HIS LAYER. AASF."TO!ld31 IIIEN3ETY FOR `11'BLL GRADED 3, 3:T. d, A87, S. 55, 57, 6, E7, ti8, MATER AND 35YE RLi11..Ve T. 78, 8. 119, 9- 10 JAG SRE FOR O'ES 1 SD M EM F3EE}41 F:N'F STphLF; F3LL � Env=4aB.nD - B SURR`OUNDINO THE CHF3v16ER5 FO CLFA CRUSHED, a L 570E %�S`€� €+>43' NO C6MPAC :ON REQUIRED, T :F ?=DU?tDAY€UN 5T:JNi= ['A' I.RYF.R] 3 4 A €ra THE'c LAVER AaovE ODNDA11UN STONE FTCLL51h :C: AMSERS FROM THE SVBGRA.DE UP CiFAN. CRUS}`.ED, aY•1G:1LAR -,,ONE AA'Sii"7 €x143' LAT:, COMPACT URTACE O 3,4 ACYSIEVE A FIAT 3V£Z AC=- * ` TF7 TBE FOOT [E3`OT'iJhF} OF THE PLEASE NOTE: 1. sir LISTED AASHTO DES!CNAT#ONS ARE FOR GRADATIONS ONLY. THE STOI4F MA JST ALSO BE CLEAN, CRUSHED. ANGULAR, FOR EXAMPLE, A SPFCiFICATFON FOR 0 STONE: WOUI-1) STATE "CLEAN, MIJS-FELT, ANGULAR NO. 4 (AASH TO 1443) STONE"- 2- STQRMTEC}€ COMYAOTIDN RE4U]ftE44Elr'TS AHL: AdF.��F FOR 'A' LOOPY€:NJ MAI�RFALS YA*E:N P.. } ) (MAX)� LIFTS USING TWO FII? i. COVERAGES WT,:, A VIBRATORY COMPACTOR, 3,WHERE 3NFIL1RA7ON SURFACES MAY BE COMPROMISED BY COMPACTION, FOR STANDARD DESIGN LOAD CONDITIONS, A RAT SURFACE MAY BE ACHIFVED 13Y RAKJNC, OR DRAGL?13G WTHOUT COMPACTION EQUIPMENT- FOR SPECIAL LOAD DESIGNS, CONTACT STORMTECrE FOR COMPACTION R£:(QLJIREMFNTS. - VE. GEO r"'£•][71ie RLL PAVthF3eT LR Y=R +DE81 GNED BY Ap3 GE05YNT�ScfEC569:T NO=\�=`4� N ` AROUNC CLFAN, CRUSHED, A rrG'-LAR STAN• E INA?, B LAYERSDESIGN ENGINEER} FERtME rE.k 5 -ON -1 [SEE NOTE 5) EXC'.AVATfOh t'VAI,3, (CAN E3�_ :LOPED OR VERIIC>' } CJCAP E_NJ L?P (SEE NDS .) 'FOR COVER 0 F PTHS GREATER THAN S. or [2.4 m} PLEASE CONTACT STOR MTECH taYrnn 1. MC-35OD CfsAMBERS SHALL, CONFORM TO 'SHE RECQUIRF_MErNTS OF ASTM ;-2416 "5':'ANOAFtD SPECIFICATION FOR POLYPROPYLENE: (PP) CORRUGATED WALL STORMWA•Z-R COLLECl7D14 CHAMBERS'. 2, MC -350D CiiAIMBERS $HAL'., BF DESIGNED IN ACCORDANCE NTH ASTM F2787 "STANDARD PRACTICE FOR STRUC URAL DESIGN OF THERMOPLASTIC CORRUGATED WALL S70RMWATEt COI -LECTION CHAMBERS'. 3- 'ACCEPTABLE FILL MATERW,..S" ,ABC,E ABOVE PROVIDES MATERIAL LOCATIONS. DFSCR;PTIONS. GRADATIONS. AND COMPACTION RERUitZ=ME.A1T5 FOR FOUNDAT;ON, EMBEDMENT, AND F:L€. MATERiALS. 4, 'IRE SETS DESIGN L•tdCNEE'R iS RESPONSI L.F.. FOR ASSESSEN3 THE SEARING Rr5€STANC:. (ALLOWABLE BEARING CAPACITY) OF TILE SUSGRADE S014.S AND TK DEPTH OF FOUNDAT10N S-ONF WITH COIDNS0ERAT30N FOR ;HE RANGE: OF EXPECTED SOIL MOISYURE OONDITIONS. PERFMETER STONE MUST BE EXTrNi'7E.D HORIZONTALLY TO THE EXCAVAIIDN WAI.t FOR BOTH VER11CAL AND Si3OPEC 'EXCAVATION WALL$. 5, ONCE: LAYZR IS PLACE. ANY SO!L/MATEMAL CAN BF PLACED IN LA zR '0' UP r0 THE F<NISNED GRADE. MOST PAVEMENT SUBBASE SOILS CAN BE USED TO REPLACE T6€E MATERIAL REQUIREMENTS OF LAYER 'C' OR 'D' AT THE SITE DFStGN ENGENEER'S DISCRE'f1ON. :NYL,OPLA$T -Q." €3b+ ern} INLINE DRAIN BODY NII FZ' [30D nlrr.] 30JU HI,v.^eq COVER AND FRAY L[mr .. FFYLGPLAST ;;1LV:>a iD]311L 740 FO*R PAVED 1f'F• LiCAf K]NS ! S F E U4,3ff TCtlsp 1 F7S5 FOR UNPAVED AFYL'r::AIIONri€ MC -T501, -. 1AW131 I? 3M - 2 iNG11 11 S mm - M CLEAN AW-WI.RR $1 L-2 LAYERS OF AASHTO M288 CLASS r. WOVEN GEOI_XT1 €,F. 3I}3 24" X6:7.^. mm; HOPE ACCFGS PIPE REQUIRED- BETWEEN FOUNDATION STONE AND CHAMBERS- (,� USE FACTORY PRE -CORED END CAPS- Mc -S500 •- 8.25' [2.51 mj WIDE STRIPS AA' FH ❑ M28e CLASS 2 E}JN-VVO'V Y NOTE: F70R MANY APPLICATIONS, T?E NON -WOVEN GEOTEXT,LE: OVER THE MC --3501 CHAMBERS CAN BE ELIMINA;LD OR DEC FE�CTIkE SiJBS'11TC°'1'F.iJ W321€ THE AASHTG CLASS 1 YiDVEN GEWTcXTFL.E. CONTACT YWR STORMTEC.I REPRESENTAYVE FOR ASSSSTANOF, INSPECTION PORT OETAIL ISOLAMN ROW DETAIL .'[!OG :nn]5•^.FiF=i: 975CRi-.�V.I-K CAP NGTES: 1. IN5PLDiE{)N?0f{TS MAY BE CONND-1'F:D 1'kRDL'GF: ANY OF 151 (;DLyCkFiE t:Gl3f.A Ci'1AN ff R C9'-�a�1 UGATIGN VALLIYS 2. AL. PVC rITTIdi 3S ARI: 'f:) BE &)' VENT CENIE!! `ED PAVi:NSF_NT 3RAN ULAR WE, L GPAIDEO 5V IL I 4' 1` G rrimj S[;HEp 90 PVC AGGRE,A"E Nl3XTURES •• 4' [17[1 msrii 1101=EG e0 FFWC COUP LING <' ! MU nmj aCF.F.7 Aft ?VC 8" j233 sskfs# 's € ///"""'''rr:FIL 4.5";`•54 mm] m!t7Ls iV CF1AhtBFR (Aa SOLE SA.41' REQ'Dj I` ,^ nFvY Lam.' [E} L'F:_L=Y 111 _; p�,ATIOF:5 CONNECTIGK ETAEL Pacific 5 v '_; ' x _ t� 3 I ...... j( I. FEND f' ...... -. E. P7arrning y::iJl_��:_:: ff i ��� NO. REVI530N BY DATE APPR f6� J. "EN, CF ''Y 0 RENTON Pinrintng/building/PvWic Works Dept. FA_____ IN COMPLIANCE WITH CITY OF RENTON STANDARDS GREEN'S LANDING SHORT PLAT INFILTRATI N TRENCH DETAILS -11-2018 i■ z _j to 2 w 0 -•••-; ELEV_=414.00 (HILI.} _ _ _ -•r= (BOD mm3MiN h:Ax OVERFLOW ELEV�4112.15 12. (Nr:xn)MIN e ELFV=411.75 45" # 1 � Env=4aB.nD 1•- Si - "'r'+'=r ^""� - -`=� E ••- ELEV=407.25 1 µ DEPTH, OF 51'O11E'FU 9E C _TER LNEC 3Y Sl?F. :^•F.5'.G:v 'M:31;¢EeR E° 73J na.) L1sN rrxmy 1YP (23v" rrml[3a 'FOR COVER 0 F PTHS GREATER THAN S. or [2.4 m} PLEASE CONTACT STOR MTECH taYrnn 1. MC-35OD CfsAMBERS SHALL, CONFORM TO 'SHE RECQUIRF_MErNTS OF ASTM ;-2416 "5':'ANOAFtD SPECIFICATION FOR POLYPROPYLENE: (PP) CORRUGATED WALL STORMWA•Z-R COLLECl7D14 CHAMBERS'. 2, MC -350D CiiAIMBERS $HAL'., BF DESIGNED IN ACCORDANCE NTH ASTM F2787 "STANDARD PRACTICE FOR STRUC URAL DESIGN OF THERMOPLASTIC CORRUGATED WALL S70RMWATEt COI -LECTION CHAMBERS'. 3- 'ACCEPTABLE FILL MATERW,..S" ,ABC,E ABOVE PROVIDES MATERIAL LOCATIONS. DFSCR;PTIONS. GRADATIONS. AND COMPACTION RERUitZ=ME.A1T5 FOR FOUNDAT;ON, EMBEDMENT, AND F:L€. MATERiALS. 4, 'IRE SETS DESIGN L•tdCNEE'R iS RESPONSI L.F.. FOR ASSESSEN3 THE SEARING Rr5€STANC:. (ALLOWABLE BEARING CAPACITY) OF TILE SUSGRADE S014.S AND TK DEPTH OF FOUNDAT10N S-ONF WITH COIDNS0ERAT30N FOR ;HE RANGE: OF EXPECTED SOIL MOISYURE OONDITIONS. PERFMETER STONE MUST BE EXTrNi'7E.D HORIZONTALLY TO THE EXCAVAIIDN WAI.t FOR BOTH VER11CAL AND Si3OPEC 'EXCAVATION WALL$. 5, ONCE: LAYZR IS PLACE. ANY SO!L/MATEMAL CAN BF PLACED IN LA zR '0' UP r0 THE F<NISNED GRADE. MOST PAVEMENT SUBBASE SOILS CAN BE USED TO REPLACE T6€E MATERIAL REQUIREMENTS OF LAYER 'C' OR 'D' AT THE SITE DFStGN ENGENEER'S DISCRE'f1ON. :NYL,OPLA$T -Q." €3b+ ern} INLINE DRAIN BODY NII FZ' [30D nlrr.] 30JU HI,v.^eq COVER AND FRAY L[mr .. FFYLGPLAST ;;1LV:>a iD]311L 740 FO*R PAVED 1f'F• LiCAf K]NS ! S F E U4,3ff TCtlsp 1 F7S5 FOR UNPAVED AFYL'r::AIIONri€ MC -T501, -. 1AW131 I? 3M - 2 iNG11 11 S mm - M CLEAN AW-WI.RR $1 L-2 LAYERS OF AASHTO M288 CLASS r. WOVEN GEOI_XT1 €,F. 3I}3 24" X6:7.^. mm; HOPE ACCFGS PIPE REQUIRED- BETWEEN FOUNDATION STONE AND CHAMBERS- (,� USE FACTORY PRE -CORED END CAPS- Mc -S500 •- 8.25' [2.51 mj WIDE STRIPS AA' FH ❑ M28e CLASS 2 E}JN-VVO'V Y NOTE: F70R MANY APPLICATIONS, T?E NON -WOVEN GEOTEXT,LE: OVER THE MC --3501 CHAMBERS CAN BE ELIMINA;LD OR DEC FE�CTIkE SiJBS'11TC°'1'F.iJ W321€ THE AASHTG CLASS 1 YiDVEN GEWTcXTFL.E. CONTACT YWR STORMTEC.I REPRESENTAYVE FOR ASSSSTANOF, INSPECTION PORT OETAIL ISOLAMN ROW DETAIL .'[!OG :nn]5•^.FiF=i: 975CRi-.�V.I-K CAP NGTES: 1. IN5PLDiE{)N?0f{TS MAY BE CONND-1'F:D 1'kRDL'GF: ANY OF 151 (;DLyCkFiE t:Gl3f.A Ci'1AN ff R C9'-�a�1 UGATIGN VALLIYS 2. AL. PVC rITTIdi 3S ARI: 'f:) BE &)' VENT CENIE!! `ED PAVi:NSF_NT 3RAN ULAR WE, L GPAIDEO 5V IL I 4' 1` G rrimj S[;HEp 90 PVC AGGRE,A"E Nl3XTURES •• 4' [17[1 msrii 1101=EG e0 FFWC COUP LING <' ! MU nmj aCF.F.7 Aft ?VC 8" j233 sskfs# 's € ///"""'''rr:FIL 4.5";`•54 mm] m!t7Ls iV CF1AhtBFR (Aa SOLE SA.41' REQ'Dj I` ,^ nFvY Lam.' [E} L'F:_L=Y 111 _; p�,ATIOF:5 CONNECTIGK ETAEL Pacific 5 v '_; ' x _ t� 3 I ...... j( I. FEND f' ...... -. E. P7arrning y::iJl_��:_:: ff i ��� NO. REVI530N BY DATE APPR f6� J. "EN, CF ''Y 0 RENTON Pinrintng/building/PvWic Works Dept. FA_____ IN COMPLIANCE WITH CITY OF RENTON STANDARDS GREEN'S LANDING SHORT PLAT INFILTRATI N TRENCH DETAILS -11-2018 i■ z _j to 2 w 0 V. Conveyance System Analysis and Design Conveyance system is designed per section 1,2.4.1 of 2017 City of Renton Surface Water Design Manual to convey the 25 -year developed peak flow with minimum 6 inches of free board and check for overflow for developed 100 -year peak flow and shall not cause downstream property damage in case overflow happens in 100 -year storm event. Use rational method to calculate the 25 year and 100 year 24 hour peaks QR=C*1R*A IR= PR*iR PR = 3.40 inch for 25 year storm = 3.90 inch for 100 year storm iR = aR * To " (-bR) Tc = Time of concentration = 6.3 minutes for small areas _ aR bR iR for To = 6.3 minutes IR for To = 6.3 minutes r 2:66 X0.65 0.804 2.734 - - ---- - - - - - ...�........... ------ 100 year 2.61 0.63- - -0.619 1 3.1.94_.... Downstream Impervious C Pervious C 025 Q100 structure area area (cfs) (cfs) (cfs) i n chi-� �) ---- (acres)---�.--........---- ..�....._.-_-.m..._.�.-_ infiltration ? __ CDS unit 12 1.0 Infiltration 0.28 0.9 0.34 0.25 0.92 1.08 Trench #1 - -- - � CB at NE .................I_ - - -----= Lot 5, 6 0.178 0.9 0.227 0.25 0,59 0.69 and 7 South basin CB at Lot 8 1.0 0.011 1.450 59 inflow to vault South basin I vault Hoquiam 0.19 0.9 0.044 0.25 0.50 0.58 Ave NE and NE 2nd Street inflow to South basin vault - -- - -- --- ; ..... .m.... ...... � ..... .. _. - - Downstream ---- Upstream M ...............- Pipe Pipe n Pipe Q25 Q100 structure structure size 1 slope % capacity (cfs) (cfs) i n chi-� �) ---- --------- ..�....._.-_-.m..._.�.-_ infiltration ? __ CDS unit 12 1.0 ._....... 0.011 4.22 0,92 1.08 trench#1 I South basin- CB at NE -12-- 1.0 0.011 4.22 0.50 0.58 vault 2nd Street South basin CB at Lot 8 1.0 0.011 1.450 59 0.69 vault All the pipes have the capacity to convey the 100 -year peak flows. 67 VI. Special --Rep arts and Studies Special Reports related to this project: i Geotechnicall Report 68 Vi[. Other Permits Water Service through King County Water District #30 Sewer Service through City of Renton Right -of -Way permits through City of Renton Franchised utilities (power, cable, gas, etc.) through individual utility purveyors NPDES Permit Through VITA State Department of Ecology 69 Vlil. CSWPPP Analysis and Desi n ESC Plan Analysis and Design (Part A) TEMPORARY EROSION AND SEDIMENT CONTROL 1. The grading for this project is limited to the onsite improvement and offsite frontage improvement. Temporary Erosion and Sedimentation Control will be provided by utilizing BMPs selected from the 2617 Renton Surface Water Design Manual. These BMPS will likely include, but are not necessarily limited to construction entrance for traffic stabilization, silt fencing for parameter protection, plastic sheeting of stockpiles, straw mulch, hydro -seeding of exposed areas, catch basin protection, etc. All new impervious areas and new pervious areas will be treated by two combined detention/wet vaults for Duration flow control (forest existing condition). At the beginning of the construction, construction entrance and silt fence along the grading limit will be installed. Then, combined detention/wet vaults will be installed. Temporary erosion and sediment control facilities will be maintained during construction period and will be removed after construction is finished. Temporary erosion and sediment control plan, notes and details to be provided at construction plan stage. A Stormwater Pollution Prevention and Spill (SWPPS) plan will also be provided at construction plan stage. 2. The site is sloped, no sensitive area exists onsite. No special measure is proposed. Temporary sediment trap sizing: Qty using VVVVHM method with 15 -minute time step: Flow Frequency Return Periods for Developed condition without mitigation at Poc #1 Return Period Flow (cfs) 2 year 0:.3092 5 year 0.4069 10 year 0.4754 25 year 0.:5665 50 year 0.63;7 100 year 0 . `! 7.. 9 Qty = 6.31 cfs Required surface area = 2686 * Q2y = 2680 * 0.31 = 645 sf. The excavation for the south vault can be used as the sediment trap. A temporary overflow path is provided to over flow to the existing ditch that runs along the north side of NE 2no Street. 70 EROSION AND SEDIMENT CONTROL STANDARDS; ESC measures shall be applied and maintained to prevent, to the maximum extent practicable, the transport of sediment from the project site to downstream drainage systems or surface waters. This performance is intended to be achieved through proper selection, installation, and operation of the above ESC measures as detailed in the ESC Standard (detached Appendix D) and approved by the City of Renton. PERMANENT EROSION AND SEDIMENT CONTROL For Permanent Erosion and Sedimentation Control, driveways and walkways will be paved. Landscape areas will be covered with grass, trees and ground covers. All new impervious areas and new pervious areas from onsite improvement and offsite Hoquiam Avenue NE half street improvement will be treated by the two combined detention/wet vault for Flow control (Duration, forest existing condition) and Basic water quality treatment. 71 STORMWATER POLLUTION PREVENTION AND SPILL (SWPPS) PLAN (Part B) 72 Stormwater Pollution Prevention Plan for Consttuction. STORM WATER POLLUTION PREVENTION PLAN m GREEN'S LANDING SHORT PLAT RENTON, WASHINGTON, USA Prepared for Northwest Regional Office 31.90 - 160th Avenue SE Bellevue, WA 98008-5452 425-649-700€1 January €13, 2018 Prepared by Pacific Engineering Design, LL,C. 1.5445 53rd Avenue South, Suite 100 Seattle, WA 98188 Phone: (205) 43 1-7970 PED Job number: 17€107 SWPPP Pacific Engineering Design, LLC. Storni Water .Pollution Prevention Playa for Construction Activities 1 certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the infonnation is, to the best of my knowledge and belief, true, accurate and complete. 1 ani aware that there are significant penalties for submitting Ealse information, including the possibility of fine and imprisonment for knowing violations. Jingso 'e r E. Project Engineer SITE CONTACT INFORMATION SITE OWNER PHONEITAXM- OIIILE ADD�:RS,S" Norm & Cynthia Green (515) 595-4296 i .105.Harpeth Hills Drive, Frankin, 77V37069 PROJECT CONTRACTOR To he determined i PROJECT EROSIO.NLEAD 24IIOUR CONTACT To he determined To be determined Pacific Engineering Design, LLC. Storm Water Pollution Prevention flan for Construction Activities Revision Schedule This storm water pollution prevention plan (SWPPP) should be revised and updated to address changes in site conditions, new or revised government regulations, and additional. on-site storm water pollution controls. All revisions to the SWPPP trust be documented on the SWPPP Revision. Documentation Form, which should include the information shown below, The authorized Facility representative who approves the SWPPP should be an individual at or near the top of the facility's management organization, such as the president, vice president, construction manager, site supervisor, or environmental .manager. 'rhe signature of this representative attests that the SWPPP revision information is true and accurate. previous authors and facility representatives are not responsible for the revisions. SWPPP Revision Documentation Form _ww.�w.... Number Date Author Company Representative Signature 6 1 3 4 5 6 7 S 9 10 Pacific Engineering Design, ,LC. CONTENTS LIST OF FIGURES AND DRAWING'S iv I CONSTRUCTION .ENVIRONMENTAL SUMMARY 1-1. I.J. Summary 1-1 2 INTRODUCTION 2-1 2.1 Storm water Pollution Prevention Plan Requirements 2-1 2.2 Purpose 2-1 2.3 SWPPP Organization 2-1. 3 CLEARING LIMITS 3-1 3.1 Site Plans 3-1 3.2 Marking Clearing Limits 3-1 3.3 Special Consideration 3-1 3.4 Selected BMPs 3-1. 4 CONSTRUCTION ACCESS 4--I 4.1 Site Access 4-1 4.2 Street Cleaning 4-1 4.3 Wheel Wash. 4-1. 4.4 Selected MMPs 4-1. 5 STOItM, WATER DETENTION 5-1. 5.1 Primary Storm water Detention System 5-1 5.2 Run-on Bypass 5-1 6 SEDIMENT CONTROLS 64 6.1. Site Sediment Control System 6-1 6.2 Selected BMPs 6-1 7 SOIL STABILIZATION 7-I 7.1 Soil Stabilization 7-1 7.2 Structural BMPs 7-2 8 SLOPE PROTECTION 8-4 8.1. General Practices 8-4 8.2 Suggested BMPs 8-4 Pacific Engineering Design, LLC:. i CONTENTS (Continued) 9 DRAIN INLET PROTECTION 9-1. 9.1 Existing Storm Drains 9-1 9.2 Newly Constructed Storm Drains 9-1 9.3 Suggested BMP 9-1 10 STORM WATER OUTLET PROTECTION 10-1 10.1 Street Drainage along the gest side of 14 1h Avenue SW 10-1 1.0.2 Bypass Drainage along the west side of 14th Avenue SVN'Error! Bookmark not defined. 10.3 Suggested BMPs 10-1 1.1 SPILL PREVENTION AND RESPONSE 11-2 11.1 General Materials Handling Practices 11-2 11.2 Specific Materials Handling Practices 11-3 11.3 Spill Response 11-3 11.4 Notification 11-5 12 STORM WATER "TREATMENT 12-I 12.1 Storm Nater Collection. System. 12-1 12.2 Temporary Sediment Traps 12-1 12.3 Monitoring Chemical "Treatment System 12-1 12.4 pfi. Adjustment 12-2 13 BMP MAINTENANCE 1.3-4 14 PROJECT MANAGEMENT 1.4-1 14.1 Phasing of Constructiozl 14-1 14.2 Seasonal Work 14-1 14.3 Training 14-1 14.4 Pre -construction Conference 14-2 14.5 Coordination with Utilities and other Contractors 14-2 14.6 Subcontractor Oversight 14-2 14.7 Monitoring[Reporting 14-2 14.8 SWPPP IT plate 14-2 FIGURES DRAWINGS ii Pacific Engineering Design, LLC. CONTENTS (Continued) APPENDIX A NPDES STORM WATER. PERMIT FOR CONSTRUCTION & STATE WATER QUALITY STANDARDS APPENDIX B STANDARDS AID SPEC IFIC:ATICINS FOR SELECTED BMPs APPENDIX C MATERIAL SAFETY DATA SHEETS Pacific Engineering Design, LLC;. iii FIGURES AND DRAWINGS Figures I Site Topography Map 2 Storm water Site Map Drawings Following Report POI Cover Sheet P02 Preliminary Grading and Drainage Plan P03 Preliminary=Composite L tility Plan. PO4 Preliminary Tree Retention Plan P05 Preliminary vault plans and sections P06 Infiltration trench details P07 Infiltration trench details P08 Existing Conditions Pacific Engineering Design, LLC. iv storm Water Pollution .Prevention flan for Constniction Activities 1 CONSTRUCTION ENVIRONMENTAL SUMMARY 1.1 Summary Beginning in Spring 2018, The developer is starting the Green's Landing Short Plat construction project located on 5008 NE 2" Street in City of Renton Washington. The site area is 1.16 acres before Right of Way dedication and 0.98 acres after Right of Way dedication along Hoquiam Avenue NF.. The existing :residence and outbuildings on the site will be removed for this development. The project will construct 6 neve single-family residences and street Frontage improvements with neve curb and gutter, sidewalk along the north side of NE 2" Street and along the west side of l Soquiarn Avenue NE. Duration (forest existing condition) flow control and Basic water quality treatment are required for this project. A combined detention/wet vault is used to provide the required Flow control. The conveyance system is designed to have the capacity to handle 100 year 24 hour peak. flow. There is no critical area in the site or near by the site. Because more than 5,000 square feet of new impervious area is proposed, extra protective measures have been established to ensure there is no adverse impact to water quality in the surrounding area. This Storm water Pollution Prevention .Flan details all of the protective envirorrrnental measures, which will be employed during construction of'the project. Perhaps most innovative and protective of all measures designed for use is the storm water treatment system. which treats all storm water collected during construction to produce clear, clean, and non-toxic water For discharge into the drainage basin stream. Designed as an integrated Best Ifanagernent Practice (BMP) to complement the other BMPs described in this plan, the storm water treatment system provides a fail-safe method For ensuring only clean water leaves the site. 1.1.1 Project Description Total project area is 1.28 acres. Total proposed impervious area is 0.72 acres, total disturbed area is 1.28 acres. Total volumes of proposed cuts are approximately 2,225 cy and total volumes of proposed fill are approximately 61 cy. Net earth work exported is approximately 2,164 cy. Pacific Engineering Design, LLC_ 1-1 storm Nater Pollution Prevention Plaia for Construction Activities 1.1.2 Existing Site Conditions There is a single-family residence and outbuildings on the existing parcel. All existing buildings will be demolished and removed for the proposed development. The remainder of the property is covered with grass and trees. The site is hilly with. average slope of 5 to 8% slopes southwesterly toward NE 2"d Street. There is no sensitive arca on the site and no difficult conditions for the proposed development. 1.1.3 Adjacent Areas Ad'acent areas that may be affected by the runoff of sediment -contaminated water is the property west of the site. Under developed condition, onsite runoffs will be collected and conveyed to the infiltration trench (for the north basin) and the combined detention/wet vault (for the south basin) before discharged to the NE 2" Street drainage system.. Daring construction, silt fences will be installed along the limits of disturbances to prevent sediment -contaminated runoff leaving the site. Excavation for the south combined detention,/'wet vault will be used as temporary erosion and sediment trap. Temporary intercept ditches will be installed to intercept onsite runoff and direct it to this temporary erotion and sediment trap. 1.1.4 Critical Areas There is no critical area in the site or near by the site. 1.1.5 Soils According to the King County Soils Map, onsite soils are till soils with Alderwood Gravelly Sandy Loam (AgQ. 1.1.6 Erosion Problem Areas The site is not located in erosion problem area. 1.1.7 Construction Phasing The construction may be divided to two phases: L Onsite development. 2. Offsite frontage improvement. Pacific Engineering Design, LLC. 1-2 Storm Water Pollution Frevention Plan for Construction Activities 9.7.8 Construction Schedule The construction will happen in dry season total construction time will he a to 6 month. If wet season land disturbance is proposed, see Appendix B for 'wet season special provitions. 7.1.9 Financial/Ownership Responsibilities Me property owner is responsible for the initiation of bonds and/or other financial securities and the bonds and/or other evidence of financial responsibility for liability associated. with erosion and sedimentation impacts. 7,7.70 Engineering Calculations See section IV of this TIR for the design calculations for the sizing of storm water detention facilities and storm water treatment facilities. Sere section V of this TIR for the sizing of the conveyance system. Pacific Engineering Resign, LLC. Iw3 Storm Water Pollution Prevention Plan for Construction Activities 2 INTRODUCTION 2.1 Storm water Pollution Prevention Plan Requirements This Storm. water Pollution Prevention Plan (SWPPP) is developed consistent with the requirements of the National Pollutant ]discharge Elimination System (1PDES) General Storm water Permit for Construction Activities (see Appendix A for a copy of the general permit). This SWPPP meets the requirements of Special Condition S9 of the general permit. The primary consideration determining the adegUacy of the SWPPP is compliance with State Surface Water Quality Standards (Chapter 173-201A -- see Appendix A). The Plan, properly implemented, should result in the discharge of water to the environment without the violation of Water Quality Standards. 2.2 Purpose The purpose of this SWPPP is to: Describe best management practices ((MPs) to minimize erosion and sediment runoff at the site • Identify, reduce, eliminate, or prevent the Pollution of storm water a Prevent violations of surface water quality or groundwater quality standards 2.3 SWPPP Organization "Phis plan consists of a detailed narrative section and the appendices, which contain illustrations, maps, and drawings. The narrative section includes descriptions of potential pollution problems associated with site features, and then discusses the selection of specific pollution prevention BMPs to reduce or eliminate the threat of causing pollution during the actual construction project. The illustrations, zaps, and drawings in the appendices show the site location, topography, sensitive enviromnental receptors, placement of BMPs, and BMP specifications and performance expectations. Pacific Engineering Design, LLC. 2-1 Storni water Pollution Prevention Plan for Construction Activities The narrative section of this plan is organized in numbered sections around the 1.2 required elements of an SWPPP listed below: L 'Mark project clearing limits 2. Establishing the construction entrances) J. Storm water detention 4. Selection and installation of sediment controls S. Soil stabilization 6. Slope protection 7. Drain inlet protection. 8. Storm water outlet protection 9. Chemical spill prevention and response 10. Site Storm water Treatment 11. BMP maintenance 12. Project management In the narrative section, each of the above elements will be discussed in relation to the specific conditions at the development. BMPs for each element will be screened., resulting in selection of those BMPs deemed most appropriate for use. Specifications and engineering drawings of the selected BMPs are referenced at the end of each. section and can be found in Appendix B. Pacific En Design, LLC. 2-2 Storm water Pollution Prevention Plan for Construction Activities 3 CLEARING LIMITS 3.1 Site Plans Figure 1 is a topographic map of the site showing all natural drainages associated with the area. Figure 2 is the Storm water Site Map showing any surface waster in the area and showing placement of all. relevant storm water BMPs, detention vault, storm drains, spill kit locations, storm. water treatment system location, etc. 3,2 Marking Clearing Limns Prior to beginning earth -disturbing activities, including clearing and grading, all clearing limits, easements, setbacks, sensitive areas and their buffers, trees and drainage courses will be clearly marked to prevent environmentat damage both on and Gaff site. 3.3 Special Consideration Special consideration will be given to the boundaries of the drainage basin on the site. 3.4 Selected BMPs BMP C101: Preserving Natural. Vegetation. ■ BMP C1.03: Plastic or Metal Fence • BMP C 104: Stake and Wire Fence (used to mark temporary construction limits) • BMP C233: Silt Fence Pacific Engineering Design, LLC:. 34 Storm Water Pollution .Prevention Pian for Construction Activities 4 CONSTRUCTION ACCESS 4.1 Site Access A temporary stabilized. construction entrance Will be installed near the location of the existing driveway entrance near the northeast corrrer of the site. All construction vehicles exiting the site will be limited to this access. The access will be stabilized. With gravel to prevent tracking sediment onto Hoquiatn Avenue NE. 4.2 Street Cleaning If sediment is accidentally transported on to the street it will be removed from the street surface on a daily basis. Sediment Will be shoveled and/or swept from the street and disposed of in a manner, which prevents contamination With storm Water or surface water (e.g., covered soil stockpile). In addition, a street sweeper may be used to maintain clean .roads on an as -needed basis. 4.3 Wheel Wash Based on site conditions and time of year, a temporary truck Wheel wash station may be constructed to ensure control of sediment at the constraction exit point. The wheel wash system (if needed) Will be constricted on the site at a location just prior to where trucks leave the site access and enter the street. The system will consist of an asphalt -lined wash pond for immersing the truck tires as the truck drives through and a. small settling pond for settling suspended sediment in Wash water cycled out of the system. Wash. Water may be reused after settling, infiltrated onsite, or transported off site for disposal. Accumulated sediments will be collected periodically, stockpiled for dewatering, then reused onsite. 4.4 Selected BMPs • BMP C105: Stabilized Construction Entrance • BMP C 106: Wheel wash (wet season only) • BMP C107: Construction Road/Parking Area Stabilization Pacific Engineering Design, LLC:. 4-1 Storni Fater Pollution Prevention Plan for Construction Activities 5 STORM WATER DETENTION 5.1 Primary Storm water Detention System The construction site slopes southwesterly towards the west adjacent property. Linder developed condition, The Flow control BMPs (Infiltration trenches and pervious asphalt, pervious concrete driveways and pervious concrete paver walkways) and the combined detention/wet vault will provide Level 2 (Duration with forest existing condition) Flow control For the project site. During construction period, The excavation for the south vault will be used as a temporary erosion and sediment control trap, all storm water on. the site contaminated with sediment or other -wise affected by construction activities will be directed to this temporary erosion and sediment control trap. The detained release will be discharged to the existing storm drainage systema. that nuns along the north side of NE 2"d Street. 5.2 Run-on Bypass The existing storm drainage systems along ?SCE 2nd Street and Hoquiam Avenue NE intercept runoff from the streets. Use catch basin inlet protections to protect the catch basins located at the cast side of Hoquiam Avenue :SCE along the site frontage. 5.3 Selected BMPs ia BMP 0220: Storm Drain :Inlet Protection. Pacific Engineering Design, LLC - 5 -1 storm Water Pollution .Prevention .Plan for C.onstrLiction Activities 6 SEDIMENT CONTROLS 6.1 Site Sediment Control System Before being discharged from the construction site, sediment-contarninated stormwater will be processed in the storm water treatment system. Clean water bypassing the site will be routed to the existing drainage systems that runs along the east side of Hoquiarn Avenge NF and the north side of NE 2 d Street. A temporary erosion and sediment control trap will be installed using the excavation for the south combined detention/wet vault. Atter the vault is constructed, the vault itself can be used for temporary erosion and sediment control. Sediment barriers or filters, and other BMPs intended to trap sediment on site will be constructed as one of the first steps in grading. These BMPs will be installed before other land -disturbing activities take place. 6.2 Selected BMPs • BMP C200: Interceptor dike and swale • BMP C207: Check. dams • BMP C233: Silt Fence • BMP 0240: Temporary Sediment `crap • BMP 0250: Construction Storm water Chemical Treatment Pacific Engineering Design, LLC. 6-1 Storm Water Pollution Prevention Plan for Construction Activities 7 SOIL STABILIZATION This section describes the stabilization and structural. BMPs that will be implemented to minimize erosion and transport of sediment from the project site into receiving waters. Erosion and sediment control facilities that have been approved as a part of the project's grading permit are shown in Drawing of the Temporary= Erosion and Sediment. Control Plan. Many of the BMPs listed below are described in the WSDOT Construction Site Erosion. and Spill Control Certification. Course Manual as well as in Volume 2 of Ecology's Storm. water Management Manual for the Puget Sound Basin and the King County Surface Water 'Management Manual and. have been included in Appendix B. 7.1 Soil Stabilization Stabilization BMPs to be implemented at this site include: Soil Covering. All exposed soils will be stabilized with vegetation or covered prior to the onset of the rainy season. The primary stabilization method used will be covering soils with an approved matting and/or hydroseeding. This will be done on all slopes as well as drainage ditches, swales, and exposed flat surfaces as deemed necessary by the erosion and sediment control lead. Virtually all exposed soils will be stabilized to protect surface water quality. Areas of the project, which have not been properly stabilized by vegetation by the onset of the wet season, will be covered with transparent plastic sheeting to prevent sediment transport. Plastic sheeting will also be used as an emergency BMP to cover previously stabilized areas, which begin to erode. Loose straw and mulch covers are not to be used as they may be washed into drainage structures. R Stockpile Covering. All temporary soil stockpiles will be covered with plastic. Long-term stockpiles will be compacted and hydroseeded prior to the onset of wet weather. Clean runoff from covered or stabilized stockpiles will be collected in solid wall drainage pipe and conveyed to a surface water drainage structure. Polymer Soil Treatment. Smaller areas of the site may be actively worked throughout the wet season to support the installation of utilities. These smaller areas of exposed soils may be temporarily stabilized. with the application of a granular Pacific Engineering design, ILC. 7-1 Storm Water Pollution Prevention Flan for Construction Activities anionic polyacrylamide (PAM). PAM may be applied as an aqueous solution (0.5 pounds per 1,000 gallons of water) or as a granular solid evenly dispersed over the surface of soils using a seed spreader (3 to 5 pounds of PAM per acre). For additional instruction and use restrictions see the WSDOT Draft Experimental BMP 5.0 - Polyacrylamide for Soil Erosion Prevention (June 21, 1999) and the WSDOT Draft Interim Criteria for WSDOT to use Polyacrylamide (PAM) (.lune 21, 1999) in Appendix B. • Maintenance of Existing Vegetation. Existing and new vegetation will be maintained to the maximum extent practicable to prevent the contamination of storm water with sediment. Vegetated areas beginning to show signs of erosion or soil transport will be covered with plastic sheeting and the clean runoff conveyed to a storm water drain. + Outlet Protection. Adequate energy dissipation, erosion. control, and soil stabilization measures (e.g., rock or other energy dissipation techniques) will be provided for all point source discharges of stornr water, including run-on discharges and outlets from onsite discharges. is inlet protection. All existing storm drain inlets, including those made operable during the prolect, will be properly protected and maintained using; approved inlet protection devices. 7.2 Structural BMPs Structural BMPs. Structural BMPs are practices designed to divert flows from exposed soil, store storm water runoff, and limit runoff and the discharge of pollutants from exposed areas of the project. 17ze goal of structural BMPs on this project is to protect receiving water downstream of die site from turbid water, phosphorus, sediment, oil, and other contamin:wits, which may mobilize in storm water flows. + Temporarily Modified Catchment Structures. Catch basins, manholes, vaults and swales may have to be modified on a temporary- basis so that dirty water can be intercepted before leaving the site. This may be done in several different ways generally resulting in ternporart[y blocking an outlet structure and installing a pump to transfer the storm water inflow to a settling, infiltration, or treatment system. Automatic float level controllers built into the pump prevent the pump from running dry and conserve power use. + Drainage Swales, Ditches, and Check Dams. Swales and ditches will be used on a permanent and. temporary basis to convey storm water in a way that minimizes the potential for contamination by sediment. Because some sediment will Pacific .Engineering Design, LLC; 7-2 Sturm water Pollution Prevention Plan for Construction Activities alw=ays be present in storm water, cheek dams will be used in swales and ditches to reduce the velocity of the water and allow some settling; of larger particles. Sedimentation Swales and Traps. "Temporary and permanent swales and small sedimend traps will be used as necessary to reduce the: velocity of runoff and enhance particle settling. Pacific Engineering resign, LLC. 7-3 Storm water Pollution Prevention Pian for Construction Activities 8 SLOPE PROTECTION 8.1 General Practices Cut and fill slopes on this project have been designed and will be constructed so as to minimize erosion. Soil types have been analyzed and considered for their potential to erode also. In addition, slope .runoff velocities will be reduced by terracing, creating diversions, and surface contouring. Upslope drainage and uncontaminated run-on water from off-site will be intercepted at the top of the slope and diverted around the active construction area. Down slope flows will be contained in pipes, slope drains, and/or stabilized channels. 8.2 Suggested 13MPs Because the site is hilly, slope protection is required for this project. The following BMPs are selected. • BMP C 120: Temporary and Permanent .Seeding • BMP C 121: Mulching ■ BMP C 130: Surface Roughening • BMP C 131: Gradient Terraces • BMP C200-. Interceptor dike and swale • BMP 0204: Pipe Slope Drains • BMP C207: Check darns p Pacific Eng D ineering Design, LLC;. -4 Storm Water Pollution Prevention Plan for Construction Activities 9 DRAIN INLET PROTECTION 9.1 Existing Storm Drains Existing storm drain inlets will be protected to prevent storm eater from entering without first being filtered or treated to remove sediment. 9.2 Newly Constructed Storm Drains All storm drain inlets made operable during construction will be protected to prevent storm water from entering without first being filtered or treated to remove sediment. 9.3 Suggested BMP • BMP C220: Storm Drain. Inlet .Protection Pacific.Engineering.Desigm, LLC, 9-1 Storm Water Pollution Prevention Plan for Construction Activities 10 STORM WATER OUTLET PROTECTION 10.1 Street Drainage along the north side of SE 2111 Place The outfall of the combined detention/wet vault will be connected to the existing storm drainage system. Haat runs along the north side of NE 2"' Street at a new catch basin with a 12" outlet culvert pipe that discharges to the existing drainage ditch. Storni water will he cleaned of sediment and other pollutants when discharged from the new catch basin that connects to the existing storm drainage system runing along the north side of NE 2 d Street. 10.2 Suggested B11Ps • BMP C220: Storm Drain Inlet Protection. Pacific 'Engineering Design., LLC 10-1 Storm Water Pollution Prevention Flan for Construction Activities 11 SPILL PREVENTION AND RESPONSE Consistent with the general permit requirements, all potential pollutants other than sediment will be handled and disposed of in a manner that does not cause contamination of storm water. 'pion -sediment pollutants that may be present during construction activities include: • Petroleum. products including fuel, lubricants, hydraulic fluids, and fonn oils • Polymer used for soil stabilisation • Water treatment chemicals (coagulant, acid, sodium bicarbonate) • Concrete • faints • Fertilizers These materials, and other materials used during construction with the potential to impact storm. ,water, will be stored, managed, used, and disposers of in a manner that minimizes the potential for releases to the environment and especially into storm water. Emergency contacts for the project will be posted at the project office and are included at the end of this section. 11.1 General Materials Handling Practices The following general practices will be used throughout the project to reduce the ,potential for spills. • Potential pollutants will be stored and used in a manner consistent with the manufacturer's instructions in a secure location. To the extent practicable, material. storage areas should not be located near storm drain iii -lets and should be equipped with covers, roofs, or secondary containment as needed to prevent storm water from contacting stored materials. Chemicals that are not compatible (such as sodium bicarbonate and hydrochloric acid) shall be stored in segregated areas so that spilled materials cannot combine and react. • Materials disposal will be in accordance with the manufacturer's instructions and applicable local, state, and federal regulations. Pacific Engineering Design, LLC. 11-2 Storm Water Pollution Prevention Plan for Construction Activities • Materials no longer required for construction will be removed from the site as soon as practicable. + Adequate garbage, construction waste, and sanitary waste handling and disposal facilities will be provided to the extent necessary to keep the site clear of obstruction and BMPs clear and functional. 11.2 Specific Materials Handling Practices • All pollutants; including waste materials and demolition debris; that occur ori -site during construction will be handled in a way that does not contaminate storm water. • All chemicals including liquid products, petroleums products, water treatment chemicals, and wastes stored on site will be covered and contained and protected from vandalism. • Maintenance and repair of all equipment and vehicles involving oil changes, hydraulic system drain down, de -greasing operations, fuel tank drain down and removal., and other activities which may result in the accidental .release of contaminants, will be conducted under cover during wet weather and on an impei-vious surface to prevent the release of contaminants onto the ground. Materials spilled during maintenance operations will be cleaned up immediately and properly disposers of. • Wheel wash water will be settlers and discharged on. site by infiltration. Wheel wash water will not he discharged to the storm water system or the storm water treatinent system.. • Application of agricultural chemicals, including fertilizers and pesticides, will be conducted in a manner and at application rates that will not result in loss of chemical to storm water runoff. Manufacturers' recommendations will be followed for application rates and procedures. • pH -modifying sources will be managed to prevent contamination of runoff and storm water collected on site. The most common sources of pH -modifying materials are bulk cement, cement loin dust (CKD), fly ash, new concrete washing and curing waters, waste streams generated from concrete grinding and sawing, exposed aggregate processes, and concrete purnping acid mixer washout waters. 11.3 Spill Response The primary objective in responding to a spill is to quickly contain the material(s) and prevent or minimize their migration into storm water runoff and conveyance systems. If Pacific Engineering Design, LLC. 11-3 Storm Water Pollution Prevention Plan ,for Construction Activities the release has impacted on-site storm water, it is critical to contain the released materials on. site and prevent their release into receiving waters, If a spill of pollutants threatens storm water at the site, the spill response procedures outlined below must be implemented in a timely manner to prevent the release of pollutants. • The site superintendent will be notified immediately when a spill, or the threat of a spill, is observed. Th.e superintendent will assess the situation and determine the appropriate response. ■ If spills represent an imminent threat of escaping ESC facilities and entering the receiving waters, facility personnel will respond immediately to contain. the release and notify the superintendent after the situation has been stabilized. ■ Spill hits containing materials and equipment for spill. response and cleanup will be maintained at the site. Each spill kit may contain- - Oil absorbent pads (one bale) — Oil absorbent booms (40 feet) -- 55 -gallon drums (2) — 9 -mil plastic bags (1€ ) Personal protective equipment including gloves and goggles ■ If an oil sheen is observed on surface water (e.g., settling ponds, detention pond, swales), absorbent pads and/or booms will be applied to containand reprove the oil. The source of the oil sheen will also be identified and removed or repaired as necessary to prevent further releases. * The site superintendent, or lois designee, will be responsible for completing the spill reporting form and for reporting the spill to the appropriate state or local agency (see Forms at the end of this section). • Facility personnel with primary responsibility for spill response and cleanup will. receive training from the site superintendent. This training will include identifying the location of spill kits and other spill response equipment and the use of spill response materials. a Spill response equipment will be inspected and maintained as necessary to replace any materials used in spill .response activities. Pacific Engineering Design, LLC, 11-4 Storni Water Pollution Prevention Plan for Construction Activities 11.4 Notification In the event of a spill, make the appropriate notification(s) consistent with the following procedures: • Any spill of oil which 1) violates water quality standards, 2) produces a "sheen" on a surface water, or 3) causes a sludge or emulsion must be reported immediately by telephone to the National Response Center Hotline at (800) 424-8802. • Any oil, hazardous substance, or hazardous waste release which exceeds the reportable quantity must be reported immediately by telephone to the National Response Center Hotline at (800) 424-8802. • Any spill of oil or hazardous substance to maters of the state must be reported immediately by telephone to the Washington State Department of Ecology at (360) 4€77-6000 (Olympia), (425) 649-7000 (Bellevue). • Any release of a hazardous substance that may be a threat to human health. or the environmentmust be reported to the Washington State Department of Ecology at (360) 407-6000 (Olympia), (425) 649-7000 (Bellevue) immediately upon discovery. Pacific Engineering Desiegn, L.,L.C:. 11-5 Storin Water Polhition Prcvention Plan for Construction Activities 12 STORM WATER TREATMENT 12.1 Storm Water Collection System During all phases of construction and grading the contractor will provide storm water collection and conveyance systems to collect and direct sediment contaminated water to temporary sediment pond as needed to prevent offsite discharge of sediment laden storm. water. Construction will occur in phases as much as practicable to avoid -unnecessarily exposing vegetated areas of the site. Clean storm water, generated from stabilized and undisturbed portions of the site, will be collected and conveyed to stabilized discharge areas whenever necessary to avoid contact with disturbed portions of the site. All conveyance and collection systems will be constructed consistent with State and local BMP requirements. 12,2 Temporary Sediment Traps During constrctetion= sediment contaminated storm water will be conveyed to temporary sediment traps, as designed by the project engineer and shown on the temporary erosion. and sediment control ('TESC) plan. The sediment traps will gravity -settle large particles down to silt size particles. Considering subsurface soil types, it is unlikely that gravity settling alone will remove all suspended particles. If settled storm water does not meet state water quality standards, the storm water will be managed by chemical treatment. An experienced expert in ston'n water treatment will perform chemical treatment. Many of the chemicals utilized for this type of treatment (polymers) can. be environmentally hazardous. 12.3 Monitoring Chemical Treatment System As with all effective BMPs, the chemical treatment system requires regular monitoring to assure the overall effectiveness of storm water management. Tine key monitoring requirements of the chemical treatment water management system include: • Sediment Trap/pond Monitoring Pacific Engineeiing Desip, LLC. 12-1 Storm Water Pollution Prevention Plan for Construction Activities All sediment trap(s)./pond(s) should be visually monitored at least daily during the wet season or as needed to monitor the level and quality of water within the sediment traps. The site operator will designate site personal to routinely monitor the level. of the sediment trap such that the water level is not allowed to reach levels approachit3g discharge. The sediment traps will also be monitored weekly or as needed for sediment accu€nulation, functionality, and for other required maintenance. In the event of abnormal conditions, site personal will immediately report the information to the site superintendent for resolution. Pump and Mechanical System Monitoring The pump or pumps that operate the stonn water management system require routine monitoring to ensure the continual performance of the system. The contractor will follow all manufactures recommended inspection and maintenance procedures throughout the life of the project. During the wet season, site personal will monitor pump systems for correct operation, adequate power supply, and correct float level control operation. Severe storm events may require more frequent inspections, especially if putaps rely on utility -supplied power. The contractor will have available onsite or within reasonable distance to site 24 -hour -a -day available backup equipment including but not limited to a pump and generator. In the event of mechanical equipment failure, the site operator will immediately take all necessary actions to replace any malfunctioning components so as to restore the original. capacity of the water management system. e Water Quality Monitoring Water quality monitoring will be performed to demonstrate that the water management process is working properly, to document the quality of water discharged to the stream, and to document the background water quality of the stream. The effectiveness of the water management system will be monitored on a daily basis, recorded on the Water Management Log form, and reported to regulatory authorities as needed. State water quality standards require treated water to not exceed 5 NJ U above the receiving water and the pH to be within 41.3 plI units of the receiving water. Therefore, the Storni water Monitoring Form will be used to record the receiving water background turbidity and pl-I as well as the quality of water discharged from the site. This information can then be used to document compliance with rater quality standards. 12.4 pH Adjustment The most likely p1l upset condition will be high pH resulting from concrete contamination. Acid or dry ice (CO') will be required to neutralize the high pH. Begin recirculating the water in the basin to be neutralized while slowly adding acid (dry ice). Acid (dry ice) quantity will be calculated based on a sample test neutralization. Pacific Engineering Design. LLC. 12-2 Storm Water Pollution Prevention Plan for Construction Activities Caution! Hydrochloric and sulfuric acids are powerful acids, w=hich can cause serious, permanent damage to human skin and. eyes. See Material Safety Data Sheets in Appendix D. Goggles, gloves, and protective clothing are mandatory when handling acid. An eye wash unit is stationed in the job trailer. Acid must always be stored, moved, and dispensed in the secondary unit containment provided. leo more than 5 gallons of acid will be stored on site at any time. Check p11 in the treatment basin frequently after incremental additions of acid or dry ice to ensure the pH is not over -adjusted. Adjust the pH to 7.0 to 7.5. Once the desired. pH has been achieved., let the basin settle briefly and check the p1l again. A low pH condition may be treated by adding a 20 percent sodiurn bicarbonate solution as above. Check the pl I after incremental additions of sodium bicarbonate. The sodic n bicarbonate quantity may be calculated based on a simple jar test to determine the correct amount for size of the pond. Pacific Engineering Design, LLC. 12-3 Storm Water Pollution Prevention Flan for Construction Activities 13 BMP MAINTENANCE All temporary and permanent erosion and sediment control BMPs will be maintained and repaired as needed to assure continued performance of their intended function. .All maintenance and repair will be conducted in accordance With BMPs. Recommended BMP maintenance requirements are listed in Tables I and. 2 included in this section. Following Tables I and 2 is a BMP Inspection Checklist for use in routine inspections of the construction site. All temporary erosion and sediment control. BMPs will be removed. Within 34 days after final site stabilization is achieved or alter the temporary BMI's are no longer needed.. Trapped sediment Will be removed or stabilized on site. Disturbed soil. areas resulting from removal of BMPs or vegetation will be pennariently stabilized as soon as possible. Pacific Engineering Design, LLC. 13-4 Storm hater Polhition Prevention .Plan for Construction Activities 14 PROJECT MANAGEMENT Implementation and management of the environmental aspects of this project under the SWPPP are the responsibilities of The Development. Company and the prime contractor. Communication between all parties performing work on the site is essential for proper implementation of the SWPPP. The prime contractor, utility installation contractor, and grading contractor should all be familiar with the SWPPP and their .responsibilities under the pian. To help delegate these responsibilities the follo'Xing outline has been provided: 14.1 Phasing of Construction The ,project has been planned kit this point in two ,phases to reduce the environmental impact of mass grading. Phase one will result in the development of the onsite improvement. During this time the offsite will remain undisturbed most of the time. Once the onsite improvement phase is nearing completion the offsite improvement phase will begin. From the beginning of construction until the completion of phase two, the stone water treatment system will remain operational to purify storm water impacted by construction activities. 14.2 Seasonal Work The storm water treatment system. has been designed to allow for work on the project during the winter months without impacting the water quality in the drainage basin to the west of the site. While not seasonal, some construction activities may need to be postponed if scheduled during ongoing storm events. Activities such as grading and trenching in areas directly adjacent to the drainage basin during; rainstorms could easily result in sediment -contaminated storm water reaching the stream. This work would therefore be performed within a window of dry weather predicted on the basis of weather reports. 14.3 Training The Development Company will provide onsite training to key personnel responsible for compliance with the SWPPP. The contractor's superintendent and project manager will be familiarized with the major elements of the plan. Construction. workers and others at Pacific Engineering Design; .LLC. 14-1 Storni Water Pollution Prevention Ilan for Construction Activities the site will be given appropriate training information at the conclusion of site safety meetings or on an as -needed basis. 14.4 Pre -construction Conference One or more pre -construction meetings will be held with an explicit agenda item addressing the SWPPP. 14.5 Coordination with Utilities and other Contractors All contractors providing services on the project which may cause stone water pollution will be given a copy of the SWPPP and appropriate training regarding storm grater pollution prevention. 14.6 Subcontractor Oversight Subcontractor oversight to ensure compliance with the SWPPP will be provided by the prime contractor's superintendent or project manager. Informal, on-the-job tailgate training will be the first level of communication followed. by onsite observation of training compliance. Non-compliance with SWPPP policies will trigger a more intensive training session to correct the problem(s). Chronic non-compliance with S WPPI' policies may require the intervention of local and/or state regulatory personnel. 14.7 Monitoring/Reporting Water quality conditions at the site will be monitored by a qualified technician and water quality reports submitted to the proper regulatory authorities on a regular basis. .Additional reports such as erosion and sediment control inspections will be the responsibility of the prune contractor or a designated consultant. Spill reports will be completed and submitted by the prime contractor on the project. 14.8 SWPPP Update The SWPPP will be updated as requested by The Development Company, Pacific E3ngineering Design, LLC;. 14-2 Storm Water Pollution Prevention .Plan for Construction Activities FIGURES Mere include Figure 1 (Site Topographic Map) Pacific Engineering Design, LLC. CO t!� w L1.1 lXl^ VJ H ....... � og 9A ryxo a. "Y'lI 1 :' � •p �� ,l EY Clvll znsalni�„r3ny - ........-.._ planning �17 NO, REVISION BY DATE APPR J. FEN6 l»mSQ. x`rw,e�iw� rl 20 ❑ 10 4 "1 t C3RAPHO SCALE SCALE- P-20' 33 1/4 L'OR SEC,3' 812+55 5 88'22'59" E 2623.98' (cf:y ;851 to 1851 macs)(basis of boaringa) SURFACE DNK {S 8$-22'ig' E 2623,83 --city rBcord} (SEF'., 7007) 5 88'25'33" E SSS2.6y' 3/4 cor to seC cor} 560.67' 66(3.87 132'3.34 5 8a 46'43" Ey CITY #m5l G, -°•� NL CCR SEC Flip_ 2 1/2" BRASS CI':Y ?R52 SURFACE D€BK w w FND' 3" Bplb6s (SEP': 2607) m SURFACE D!SK 65:.25' Y 88'23'T5" ti' 4 (SES 2DO7) ni 861,25' N NS 88'2d'16" E 6fi1.5K' N ar y ,o o � � n � 667.85' ti W25'! 6' W c ri m M N m jjEEE `/1 n IIID E EX -CTR OF SEC, :3,'D. CCNC MM, [N CASs (SEPI' 2007} 883.D2' e2� T7325.44' .�. 5 88'29'19' E 2652-08' '• SECilDili BREAK _DOWN o57.S5' CITY OF REN?'ON e':anring/Bui€ding/Public Yorks Dept - I IN COMPLIANCE WITH CITY OF RENTON STANDARDS I CAREEN'S LANDING SHORT PIAT EXIS'nNG CONi1[i ONS 12-04--201 6 I� ■1. Storm Water Pollution Prevention Plan for Construction Activities Here Include Figure 2 (Storm water Site Map) PacificEngineering Design, LLC. Q F-- f� 0 U) 0 z C7 d z W w E'C 0 ... ... ... .............. - .. ............. .. ... COMBINED OE'YENTION ± MT VAULT E441 x 27'W] SEE S35EET FOS FOR DETAILS 1017 YEAR DETEN-01i WATER SURFACE EL. = 4,^.1.50 TOP WO El.. - 397.50 BOT -mm. WL] EA_ = 383"5,7 REWIRED DEc.NMN UVF STORAGE = 4,650 OF PROVIDED DETENTION LEVE STORAGE= 4,752 OF RFQJIRED WO DEAD STORAGE : 2,065 CF PRONGED 194 DEAD STORAGE -u 4,752 CF ,NV. 5" (SE. 'E) - 3915"00 INV, 1,1:1 SE} = 396.OD 12' FLOW CONTROL RISEROVERT 4W FL- - 401-50INV, 12" OUT (SW) = 397.5C BOTTOM ORIFICE EL = 395.50 BG-FTOM ORIFICE IIIA. = 0.75 2ND OMRCE 0." E17OW El_ = 388.9D 2ND OR� ECE :7',A - '• OO• r - _ �- •-CONNFCT TO . .... FXISTING Q3TCI: = I .) N I i �..... , rCS #1 L f -E I) Zl PROPOSED WA7EI7 MAfN €,< PROPOSED Lar PFROPWFb SAVVJT c:rrE PROPW..'O MfIUNE CURB RAMP flROP05FU ASPNALI PA5M-M NT ` L_ PROPOSED SIDEWALK m f 1 -- CE3 p (TYPEjw NEW 5' STOR I LOT COAnHINEO DETENTION! WET VAULT SEE NOTE AT ;_EFT f :... _.:....:I ::. .....:.:.:.... —EMS"1Nc TREE TO REMAM {TYP} 12 11 i2' ` .. S CB ,�33 {" 1'PF. il}..: i Yf-, � •- _ � � I , j CONTECH C➢5 2015-•4 OR f _ • AFPR4Vt0 EQUNALENT OR PRRE-TREATMEN s SEE Lr -•,•�� :0 ORIP OR A R r NOTE AT RIGHT. ! I w --- _ f rRJhEE (iYil) 3 5F �. _ - vI 1 NE17".fR'. rs oo-sl'1�: iw xss.7' .. LOT 3 j� �` ... .... 1 .... LOT 2 - `w ❑ i❑ za as ....... .. .... .... 5.�1..� .. ...5'.J19'SF ...... ...i . ...... ..........y+.! - ce p32 ('CYTE 1) �'- - CB #14 {TYPE {API" C SCALE 1 25' pRivelTE slow a i I ' SCALE 1'^20' F I CRAiNAG EASERAF.FFT lNFILTRATIOH SYSTEh1 STORMTECH -412 1 L_ ---- -." --_........_._".L -- -=------.� ...PI -------- CLEAN, Ur ED;A AN= -AR, STONE BED SIZE j q❑.� "• B X15 'YYE R} _ 177,51 XR22.75'W XN5.511 W T13TAL 30 CHAMBER% .............T .....- _...-.........__ '-h"'" .." "•• __- W......w._....M _....� �� W _ 1e1.z&' .._ ..... S END CAPS. 'S ROWS - ONE tS]LATION RM TWO I r - i...f � RNF17RAT[ON CHAMBERS, - -- - -- -- -- -- --- -- --E-"' ' _"I," •• - - - - -- --- --- • ---) SEE S'iFET POE, P07 ECR DETAILS CB >P11 {TYPE :}. - GRAFSE QE AG:E"aS ROAD: � TOTAL LIVE SfORAL:E RE4L11i2E0 4,966 (:F 44w, ni ` e TOTAL ; STORAGE P NDF'�' S 9 O OF � '•. "s ; � - ..lv'r. .AGE Rt7 :. ? SAWCiJr Fx. ASPHALT PAVE3�REN' ('IYp) I II{4 j' ; . � ..s �? •="� 5,384 � m ��� w� 5,Ot5 � ::..€ I # I LOT ,�j _ ...............i;_ � � -li __............-�i LOT 9 SYSTEM OVCsiFLGW ..1.. = 4F2.75 LOT g ;. } .. E r 24 LF INMTRATkON I N € III 1 '�I - ... .. . s,aso s,saa sF "-• FTA Ix I I I I c a 3 I INCH s1 R (SEE €7 . L � 1 { .:.....•"I .. ... .. .. � ..-• . I.e G8 SIG (TYPE: IS., f' 'I --I SEE € k0��,?-si5 S;i=E� ] I I s: € I S I i.. f s` ]y 1 s .cB eg : '!PE II) C8 ['6 (T -PF Icy fi +IS J :j it � I If 5..... 1r_CB SIA. C-FOO..(NE.,2ND STREET) r� i q N .... STA 5+00 {'.i0[Y31AM AVE NE) 3 j 1 F... r �3 27 LF FNi1RTRA7IAN...-...- £t y ;R ❑aana' w �as.ss' {Exis c] CS 08 {TYPE t) E 'OB !18 (TYPE E) w 69 3, y - ?... j HO©UTAM AVENUE NE... ?.. �.. TRENC" .:...................:.:::::...:.:::.::.:-:::.....�::::...... .. f #4..SE.. D.E..T..A._...I.L ._....................._...........J.............................L::: �_..i......... .�..:... ..:::L'J....... .. ...... ............. ... ........ (.f.............-.-7.SI.A . ACCESS) .......................- _ i ..... ... ... .........: SHEET PB ..::::.::::.................. 2. ST�3A::-33Pj:..::.. ......,-.NEW-3 ......................... .....................................:._....- -:.. ................................................................................................................... I � r 1 i LEGEFND P'FK)P OSED FEATURES _w...._Sp................ PRQP[ia.-D Srow DRAIN Pip, ---------SS------ P,?OPOSED SEWER MAN -------- PROPOSED WA7EI7 MAfN LOT PROPOSED Lar PFROPWFb SAVVJT c:rrE PROPW..'O MfIUNE CURB RAMP flROP05FU ASPNALI PA5M-M NT ` L_ PROPOSED SIDEWALK .-�.-_�--W-- BOUNDARY / R.D.W. LINE — CFNTERLJNE` LOT UNE OUTTER, FLOW, & CURB TINE: -- ---- - FA' F.4E:NT UNE BIXL`31NG !X T HACK UNE (BSBL J 70' EXJS77N13 CONTOURS ....... ........ 2' EX7SFN5 CONTOURS -.-_-.410 ..".- -. 10' PROPorcED CONTOURS ._.._4+7 ................ 2' PROPOSE] CO,YTOURS .�.a R32IS ❑ JiAh19ETi 5URYsYR �7711r],aTVS1 x Pacific ---- CITY J ' RQN A. LY7p 0 ` Works Det - f civil J. M40 ,a,,z Kmwrr Planning Cr.,��:,Jr,�,:::_ i f���f�l/ ND- R ISS,ON GATE APPR c IN COMPLIANCE WITH C11•Y OF RENITQN{ STANDARDS GREEN'S LANDING SHORT PLAT PRELIMINARY GRADING AND DRAINAGE PLAN ■a a J LL 0 Q z uj Lu I: T Storm Water Pollution Prevention Plan for Construction Activities DRAWINGS Here include appropriate engineering drawings such as temporary esc, detention basin, tire wash, construction entrance/exit or any other drawings prepared specifically for the project. Pacific Engineering Design, LLC. CIL",L E33^INFER: PACIFIC CNGINEER;41G ]ESif3,4, U.0 15445 "RD AVE S. SEATTLE, RYA 98055 PHONE: (206) 431-7979 GrOTECHNICAL ENGINEERS: ROBERT )A. PR;DE, L -LC 13203 HOLMES POINT DR. NE KIRKLAND, 'AA 98034 PHONZ; (47.5) 475-0551 THE R1€ -EY GROUP, i.LC 17522 BOTHELL WAY NE. BOTHELL. WA 98011 PRONE: (425) 415-0551 6R0lJR?ST': GFaNFORES% INC. 4547 S. LzXiLE ST, SEATTLE. WA 981316 P -HONE: (206) 72.3-0656 SURVEYORS: CtNTRE PUNTS CONSULTANTS, V- 14209 29'!H ST. E SUITE 105 SUMMER, WA 98399 PHONE: (253) 813-•3901 HANSE'N SL:RVcYIN0 17420 176TH AVE. S-E- RENTON. WA 99058 PHONE; (425) 235-8440 an ❑ "a 20 ao GRAPHIC SCALE Y- SCALE: r -w �! �X P01 COVER SHEET P02 •• PRELIMINARY GRADNG AND DRAINAGE PLAN 103 PREUMIW4RY COMFOSITE IJTLI1Y PLiN PO4 - PREUMI3+ARY TREE RETENTION PIAN P05 - PRFUMINAfRY VAU:T PIA.ti AND Sx`.CTIONS POS - INFILT20,01`4 TRENCH )ZT LS P07 - INFILTRA'3ON TRENCH DE7'.4:LS 900 -- Dx1STING COHDt'IONS yr rr I p(ANEYD38, CITY of PENTON (PARCEL NO. 152305-920,-920) WCWTY MAP ,SITE INFOFMA77ON PARCEL NUMBER: 152305-•42'.8, --9219 ADDRESS: 5008 NE 2ND S". GROSS AREA: 50,5534 SF R.O-W, %DEDICATICN): 9,659 S= NET AREA: 40.674 SF (0.43 A^.) PROPDSE7 LOTS: 5 ZONING: R--8 OENVY PROPOSED: 5.66 OL`/ACRE DFNS;TY PERMr,.'t�'D: 8.00 DU/ACRE OsSTURBED AREA: 55,75'7 Y' (1-2.8 AC) EXE5 -NC IMPERY10US AREA: 10,OT2 Sr, (D.23 AG) .5ROSS NEW IMPERVIOUS AREA. 31,537 SF (D.724 AC) Nr.'T NEW IMPERY:OUS AREA: 21,51$ SF (+?.494 AC) ,"ONT YARi) SETBACK: 2.7' RFAR YARD SETBACK: 2Q' SL57L YARD SETBACK: 57 SIDE YARD SE'BACK: ?5' (AEhYG 5TREE?5) LEGAL DESCPW7M 114F, FAST 35 FEET OF LOT 3 AND AIS. OF :OT 4, KING COUN FY SHORT Ni A- 140. 68',050. AS RECORDE7 JANUARY 22, 1,962 IRIEDER RECCRDENG NO, 8201220536, RECOiOS OF KING CGIINTY, WASI:3NOTQN, TOGETiETg WITH TTEF. FAST 30 FEET OF THE SOUTH HALF 7F TNF SOUTHWEST QUARTER OF THE NORTitWEST QIUARTFR OF THE NORT?EAST QUARTER Or` SECTION 15, TOWNSifP 23 NORTH, RANGE 5 EAS7, W.M., IN wJXf, COUNTY. WASHINGTON. CITY OF RENTON CONTROL PT, # 1851 FOUND 3 1/2- DOMED BRASS DISC WITti A PUNCH ON CONCRETE STREET SURFACE AT -HE CENTIRUNE OF NE 4TH ST (SE 128TH ST) 18.75 E. CF N 1/4 COR OF SEC -PON 15-23-5. ELEVATION = 398.55 FEET VEFnCAL DATW NAVA 1988 (CITY OF RIDNTON) WTU LOCATION OF E.X15-INd; UTILITIES SHOWN ARE APPFN)XIMATE. AND MAY NO 9E ACCURATE OR ALL ;NCLUVVE.- IT IS THE CONTRACTOieS REsp,(wS;SIiJ FY TO =7EtD VERIFY LOCATEJN OF VPIU-IES PRIOR TO PROCEEDING W4'rr3 CONSTRUCT10N. I I ZD t YOU MUST CALL 1-800••424•-•5555 NOT LESS THAN 48 HOURS BEFORE BEGINNING EXCAVATION WHERE ANY UNDERGROUND UTILITIES MAY BE LOCATE]. =AiLURE TO DO 50 COULD MEAN BEARING SU6ST.ANTIAL REPAIR COSTS. ;UP 'ID THREE TIMES THE f.-. � COST 01: REPAIRS TO THE SER)ACE) ....-1 IN COMPLIANCE WITH CITY OF RENTON STANDARDS ;c WA-tER WATER DISTRICT 90 SEINER C€TY OF RENTON STORMWATER C€YT OF RENTON A Pacific .�-n ,+$3pV�7 1- zn CITY U REN; F LY wK •al aA"l1 A{--� € \ �.: �1 MO k �7 _:. �I CIv7f �r+.cJJu �a �•r1rr ?r � � FiNG �`u�s� Plurning/8ufldfng/Pu6ii: Works Dept. Plzanning �ans�+1!_: r:fi: �� f�t7 TtO. REJ38fOH BY DATE AF'PR �cr.K�ar t J. FEM GREEN'S LANDING SHORT PLAT i 11-2514 � L.I COVER SHEET w PD1�POS [, Q z r� f 1J z L11 Lu m, 0 CGME INEO DETENTWN (WET VAULT [441 x 27'W] SEE. SKEET P05 FOR DETAILS 164 YEAR OFTENT1 N WATER SURFACE EL = 44)1.50 TOP WQ EL•3 347.50 BOTTOM WO E3.. � 343.50 I I REOl11REO OETrNT10N LIVE STORAGE 4,660 CF .3 PROVIDED DEIIEN,1I0N LIVE STORAGE 4,752 CF . REQU� RFD WQ DEAD STORAGE — 2.065 Cr E PROVi= K DEAD STORAGE = 4,752 Cr INV. 6" ;SE, NE) = 398.00 j INV, (37." SE) - 3n -W f E2 12" FLOP( CON1ROL RISEROVERFLOW EL - 40'..50 INV, 12' OUT (SW) W 397,50 UDTTOki ORiFiCE FL. — 385.5D j R0, TOM ORIPCE UI A. = 0.75 {314..) 2ND ORIFICE 4" F. -BOW Fl.. m 598-90 2ND ORIFICE DEA. = 1.00' CB p('INP£ I'J1 f- `•�"'j^•�-.CONNECT TO � Z' ... ..... .. E)CSTtNG DITCH •• I LOMSIINED DETENTION f W VT VAULT € l j SEE NOTE AT TEFF ........... ... CB g4 (TYPE :) - X€S?NG TREE TO REMA.N w \ f w ln..+.1' 1 _-_-_-.-----.__ ...----_-------___ 1_� CL TfTS (7Y1 E'I;] • 1 ;`i5-4 OR ----------------' -- - \. / �. �' _.� j coNTECH CDs 203 : 1' APPROVED EQUIVALENT 'Y L� � .,"• FOR PRF—TREATlkENT SEE TRACT S STp.i A j HET' AT Rl.,LIT. _ \ OR.PIJf(Ty') sv :LOTf_ eor ag� - NEA W 248.715. .�:. ..20 .0 10 20 40 sTcr rP} ] C9 034 (TYPE 1) C13 #12 l TYPF ��...�.�� GRAPHIC- SCALE es. s W sa.or• 25' PR1YA"E S'GRM 1X24' DRAINACX :.ASF.M- � I NFtLTRATItGH SYSTfM STORMIECH MC.113503 1 412 €_--_ — .-.--.....-• -- :;F-- .—.......__ _.- CLAN, CRUSHED, AN `,1)IAR, STONE BED 517E g •;: N � ---. ty, , C8 #!5 (FNP 1) _ 1'77.5'2 X 22..751N X 5.5'yE] W4 TOTAL 3G CHAMBERS, NEW B" jj .rte? SfQtil� TYP} 1 Ll '7 _.-....... --- N : f' CAPS- 3 Ri]'h5 — ONE�SOTICN ROW, TSYO SEE IR ° R . W� �� 8 END � ;uPkLTRAT N crAtABE. S -EE7 PC6, P07 FOR DETA;=_S CD #=3 'T -,-PF i] - �-TCRARE OF ACCESS ROAD! TOTAL VEE• STORAGE O 9 1 E PRDED � 5.4 UV0 CF x I :...------------1:.. L.- ` .1-71•- -------- -. N svrrxu nvc•aF,. nur ri = rt1?.75 PRC f(C ---------- FEA7LF?ES - .sp..._.— PROPOSED S7ORM ORAIN P?PE SS PROPOSED SEWER MAIN .------ IV.__-___-__-_ PROPOSED WATER .44*N LC7C3 PHdPO5E0 CU1' F'ROP(.%%_0 -"WCUT ONE P.RCPO5%'o 0wrPLINE C Re RAMP PROPOSEC TPA W404T PR[)Pfl5E0 S+om"'K .-•....�---...._� 90VNDARY / R.0 -W LfNE CON TERUmf .,...-.-_. -_ LOT LINE --•-_ CUITE'.4, r^,OW, & CURB U --NE ----- •- --- EASEMENT :.!NF - - -' •--- � BJVY p ?40 s£PRACK LINE (BSK) [,1157NG Cb,YT•OURS ... ':........ 2' F-X€ST1NC cGNTou;?s ----r,se---'- to' PROPOSED CON r77Cer s -`'--412--.-.._._..- 2' PROPOSfD CONMURS Pacifies x� ��1 �_r.>' ,'� o. a CITY OF �r r [Nr � J'J ��TJ� DgFs�N .. — civil En�in�r_--:7:,y „ AL � P=rn�+iny/33u:id;ng/P3blic WYorks Rept. REVISION s I■ 0 IN COMPLIANCE WITH CITY OF RENTON STANDARDS a: 0 0 z GR EI N'S LANDING SHORT PLAT i-"11 zola � m.au m uj PRELIMINARY GRADING AND DRAINAGE PLAN � CC P02%8 r�i .... .. -.... ....... 3E REMOVEO (sYP) ......I � * ..... REMOVE EXISTING INA -ERR � I METER AND 3AE'l-tR Hf;x ! � -•- - . �. r LID m -- _---------- -- _ t—_ ----------------- 71tAC7 6 STUB A[i + I i/€I 1 / LOT 3LOT 2 TREE. TO BE REraNEn ........ II [ I --- / w a 10 20 sc f 2 ----��-•- Ow - ----------------------- _, iC - - ..... ..... .. ` 9CAL.� 1 26' H }[I 3 SEE DETA3L .,......_............. _ I '€ • L 10 PRIVATE SrS_Rj � 1 s - . 021UNE (TY-) I �T1UPRfVA'i'S~W�R �MFTIS Si3EZT FASN 3 f '• C•f _i-•[..,...�,.M. 25• PRIVATE STDRh! 1g', •s 1 LOT 6R LOT S I 1[', _ DRAINAGE EASEMENT 1. ......7 NEW 8" WAIER MAIN--' � I . � '': � � • -..�. - „ �..; LOT 4LOT 'I 1.7 PR.VATE S.:WER EASEMENT I LU uj I € 11 I { I .�-- � � ffE.'fFR TTP' ��• � I I E # --- E7CoEL 51 c A 1 J 1 I I SID""1V LK 8' LANDSC E � VItUIIOSED SIDE SfWEii � I = _ _ � s s s � . rr _�•{E� (� i PLANTER [XjNNECTIDN (T)P} - -- ---•� ."" """ 51'R D•F00 (!::: 2ND STRI:£fj ! = �''?:.:?;:: ..:� / �'�'•.`•,F..^•^�:_•: r/ I €�-- - - •-_.� .q•�._ •�..'�"� --7 �...............................SSSS. 5,.A 5+03 HOQU.4lA AV;SFUE NE] ,-� ..�.-^•----, x:T _ .. Sr _ .. . , ., .:,�:., .,.;•,,: gar.. w .-. - SSSS.. -. .._...z....-.:. ..t. .--.. ... �.. ,�-�. I SSSS: - y ......................................_... ,.................,._._..• -.- ............................... .................SSSS ... �O� t 3C'<R.O.W -SSSS. ..-.g0, .. ' r � 4 :. VERTICAL LY:R33•• ��� Y` ���'w •�,�����ry ,� 1 � -.:.-- .......- - ... o n ' OW ... �.. � ... � AND GIJTT17i Di ON A 1 I i71CAi1 � R y I i- � �r.,`;".."'�"'W".""" { ... SSSS .. ........................SSSS... -SSSS. ............. _;.......... ... .SSSS..-... �....--....-......-.................................................SSSS-.-SSSS-.-.......-......s,, SSSS.. E,ao-.......-..................__� ..... ----- - - --- - --------.._ _- — _......... ---- -- r� ............... _..:; -. _. _SSSS..-._..-... - _ -•{ - ' t �... �._ SSSS --... _1.. .� n � T Iw t ..�.. .- ,._ "L I i I I ] I i r .: - SSSS C7 ... i --- SSSS -SSSS. : € HUC7�liAM AVi iUE N ry; _._.. _..-- ............... J .._._................-. .='1 .; ...iFlEOtT)EfQi%l1L ncc♦n9.... L SSSS. _ -.- I......-• ..::. SSSS.; - SSSS. SSSS. SSSS - SSSS. � - ,_SSSS .-..-SSSS..-.........,...,,....,.....�...................................................................... ... ......................................... -......................... ........... ...... ............ .... -.....,............................___.. :SSSS I SSSS........................-.�...... _ ................-...... ....... -..:.............. ... �...�.::,._.- SSSS ........ ....................._..._................_.. _m.... SS SS.. ................. ... _SSSS..-- - - - - .......--....--........ ...... -•---. _ _.............- -- -- _...................w, .. - — - - _ <c: � .:: .. . ����................................ ..-....:�::. i' PROPOSED WATER SERVICE -- CD�1NF�€ TO EXISTING .. CONNEC11Oh ) SSSS... SSSS. SSSS., ..-.._.:: SSSS .. - SSSS . WATER MAIN ;TYP �iS41NG SEWER MAfN EXISTING WAIER MAIti SEE OETAl THIS SHEET PROPOSED SIDE SIT ER ASFHAE.TEXISI PAVEhlEN3 (TYi } .. CONNECTION (lw) PROPOSEC R.D.W. � R.O.W. ;PROPOSED) EMSTlNG H.Q.W. FXIST',NG R.O.W. QL R.O.W. EXIS73NG R.O.W. _DOE OF R.O.W. (EX -STING) ; I SSSS.-� �•"��..,..'34' �JEDiCA:rQN----r1•,..• ....._..3Q'---�'-3 F�-�-�-�---30'x,, 3c]' w-•• I I Li1HHt ! 5' SIDEWALK PER COR STP rI.AN 702 E3" [;:YRB � ! 5' SI EWALK 5' SID:•WALK PER COR STY; PLAN W. 6' CirR6 ` B• LANDSCAPE PLANIEI2------ 16,— -•.. 22' f 3' LANDSCAPE g'_..........,.. —20' ................ ; 3 i I S 1 ;EDGE OF EXiST3NG -5x 1 _ s !PAVEMENT ... ................... �..... 1.. _ N1 F.59t NEW VERT:^AL 1 `• (MAX CUR33 & G S: PIAN 107 .. ......s.. -....j..... -..-. (NiAX) CURB Ac C_ml£R �L•R CDR STD PLAN 501 EX,S..NG GRADr. ? �----- .--- - SSSS... -SSSS ... EW VERTICAL II i - ti57EH pER COR "'T3 . 111 ----- :.Ex :.:8 7 . __...........SSSS.-�...--.-...,. ._..:-: -:: -:. -:. .......... .. _..�- .,..... .,SSSS.. SSSS...-. .. VAX,f�EYS5TlN3 Br SS--a.�-j ...��EX. 8' SS �..••.. ••..,,. I ., REMOVE 2• (MIN,) D(. 1 St l •SAIYCVT EMSiTNC PAVEMENT REMOVE 2' (M4N.) EX. PAVEMENT AND r l i PAVEMENT AND •SAWCIT EKSITNG ?AVEMENT REPLACE. Yf.TH 4" OF J 11 -PROPOSED GRAUF. ctEY? AC,c 'Fll'I-I 4' OF j \ HMA OVER 6' I HMA OVER 5" " EX7STtNO 6" WA [--PAVEMENT REPLACEMENT OF 7" CRl:S?iEp Rc"7.^.K PE CRUSHED ROCC PER ;lRCilOSED GRADE COR STD PLAN iO3(iit:r.) HMA P," GAIN.) CRUSHED COR S11) P3.AN 103 —PAVEMENT RF.P ACEMENT OF 7" RM PER CDR STD PLAN ?03 (WIN.) HAM 5" (MIN.) CRUS,4ED ROCK PER CAR STD PLAN IG3 h{�Qu { A.V NUE AE SECTtC]N - NE 2ND STREET (SEC"f M A -A) BCALe N U 9Qk.9WH ONG By DATE APPR I Fi C17Y OF REN "ON I ---a•=.>. ......� Pluamng/Bu:lclsg/Puha: 'Narks Dept - C7 z GREEN'S I.ANDING SHOOT PLAT-s7-20TB U) z PRELIMINARY COMPOSITE LITLITY PLAN LU P03 25' SIOftM DRRfNAGE EAS'EMEAT w w V 16' PRSVATE __ACCESS 1RACT__� LA i UNE 12.5' 17.-5..„._.._. EX GRADE 1 !1OT`: LONGITU',]IidAL SLOPE OF ACCESS DRIYt=2,er% PROPOSED GRADE --• TRACT A -- ACCESS (SECTION C --C) SCALE, 7 - 9' [”] IN COMPLIANCE WITH CITY OF RENTON STANDARDS Cc C17Y OF REN "ON I ---a•=.>. ......� Pluamng/Bu:lclsg/Puha: 'Narks Dept - C7 z GREEN'S I.ANDING SHOOT PLAT-s7-20TB U) z PRELIMINARY COMPOSITE LITLITY PLAN LU P03 II.. I-'- 0 0 z 0 z Q Li! L1J CL C3 I �• � j � I I I 4120 i i I Y . ...... ......... ... TRACT 14iii f �r ......... - - ... L.OT.3........ LOT � ........ ...... � :I� � I I�� f� f J S E �:•I = � � I i i �EkISTNG TRE£ 7Y} OE REMOVED • P E _i: Sn.NG IREr TO i AcT -- ..-.... ; LOT Gv. 1 LOT 5 } 1 9E RETAINED ;TY':'} 1 ACCESS j LOT 4 LOT 1 i d' CJ................................... }- x COMPLETE TREE DATA Tree No- Saecies ............ DgH Di. _._...._,. To Remove To Reman 1;LMj {RW) Nrestera red -cedar 4E 1--- x x 2 Giant ser;:lnia Y3 7 x 22y 3 [L3H} S€gleaf maple PaCJ 25 k € ;1 4 it r4q} DaugS6s-fir 37 21 32We5(er:s fed•Cedar F 10 E x S {C,U}�W Doug'as•fir2C3 w.:33 ` Wester- red -cedar 18 12 € x W W __-•• 34(UH) file*fmapi 3i Western red -cedar 24 W 15 x .6 7 Western red�Ldar ••�36 (Li H) Sigleaf maple 35 25 x 15 ..w 8 {AC} _....�........ Western roc -cedar ............_...._ u i3 ............. 's4 ....._........-. x _...._........_ 9 (LPrl) Douglas -Fir 30 6 x r 1O ] Blgle« rra;,ie 13 B 41 Douglas•fir �7 x 3 i................ W~ � ... ..... 42 OOuglas-fir 25 17 --- Western red -cedar ]] Al � Deugas•iir 27s-fir2G 65 (RN1) 44 i Douglas•fir 23 "7 x s-fir j3 € µ..stern red cedar 1=14X 9 {:j H) Big leaf n, sa€e 6,5,8,8,8,8Douglas•fir 7 ^ M..y 46 i Doug€ss•F;r ? 22 16 k Western r J-cwdar• 47 Douglas -fir [ Ae xz x 6S(LM (RW; M..4$�• :gias-fir 16 M� 15 2 W-.....•, .S Wgleaf maple 29 x 1S ;Lry?i western red -cedar 36 =$ x x 17 Western Mrd ,odor 13 Z2 .-.... x w _ ]8 W..Westem rediedar.�._7 W " 14 k,,..._...;3--.---�--....-. X i 19 4Ve5rBrr•-rid-Cedar 17 1- H _ _�0 W Western hemlock W 9 6 k € ?t W2SSBrn red •cedar . 3 12 .� ., x ... .....V... Z7. Western red -cedar 12 12 •x 23 (LN1) Western red -cedar 36 15 x 23 {EM} Daug:as-`ir 3U 71 x 25 _ Mµ Blaric pine 3 ww_ a 11 _................. 10 ._ k �a en : •- i i Frlannrng ynrs ai-_rr, �M.m._• free No. Speeles D3H 7L 7C R�r-1aVe = Ta Rer:laIn 26 West em redLed3r I H; i 14 Western redy;edar x 27(LM:} r red -cedar- 7 PROPOSED RETA€NED '€REES x we! stvr-red- eda-r-;..-. 23 35 w._ _. K.W.. pl- ],s DL 3 18 DL 10 29IE^+1] DGg:as-firy 43 22y x Di. 14 30 Doug3as-fi,- 23 15 x € ;1 31 Duug€a5-i:r i 19 =5 x .. ➢L 17 D; ai 32We5(er:s fed•Cedar F 10 11 x N w.:33 ` Wester- red -cedar 18 12 x W W __-•• 34(UH) file*fmapi 3i 'S x —_ 35 Douglas -Sir l4 .6 x i �.€Y•••� ••�36 (Li H) Sigleaf maple 35 25 x 15 37 L'des',ern red•cedor 11 10i k ._..... 38 Douglas#ir 9 & x �W} ••• 39 (L'H) Douglas fir U 6 x x 46{UHj Douglas -fir 5 ': 6 x B 41 Douglas•fir �7 A4 x 7 42 OOuglas-fir 25 17 x Western red -cedar 43 Jaug:as-fir 13 -.2 x 65 (RN1) 44 i Douglas•fir 23 "7 x i �56{R6Vj € µ..stern red cedar 7 9 4.5 Doug€as-fir 17,75 I 18 X 7 ^ M..y 46 i Doug€ss•F;r ? 22 16 k Western r J-cwdar• 47 Douglas -fir [ Ae xz x 6S(LM (RW; M..4$�• :gias-fir 16 M� 15 _ x W-.....•, .S Wgleaf maple 29 22 x 7 Douglas-£ir 2[3 1G x $ -N` �1 NAY �8 Tree N¢. Species D6it DL 7a €temave 1'a RPmaln ___. ... 5: -, •, Western redy;edar 26 15 H PROPOSED RETA€NED '€REES 24% 15 3(L'rl) 25 1 paugias-f;r 3 D;, pL Vdestam r �•Ledas Dt OL Black pine SPI. __.DI, i p,, Di f]? pl- ],s DL 3 18 DL 10 26 Western red -Leda- PL DL DL Di. 14 .........-.-----,� .. 50. ....................."..... i Wes7.e*� ed ced..r......_8_ GL € ;1 .---- ......w..... X ' Wzs;em red -..odes r DL DL . .............. £ weSIQm red�edlr ❑_.— PL ?L PL .. ➢L 17 D; ai 5€3 Wascem red,edar DL DL SSfSJf?; Weswrnred-cedarT• M9• 14 x Y... S7 ILM) Wester^ red•cedar ? 30 17 x � S8 •• INes:er:s re:i�:edar ' 24 µ i �.€Y•••� x 59 Vdes:er-^-red•redari 15 15 x j �W} ••• Wes te•r:l red -cedar 1D d 7•p m x • 5r. €Rlh'} VJer't��rn red -radar 7 B x 63 (RW] Western red -cedar 7 $ X K(RPI Western red -cedar $ µ 3 x 65 (RN1) Western red -cedar•• 10 k �56{R6Vj € µ..stern red cedar 7 9 X T" 57 [:LWj Western red -cedar 7 ^ M..y 9 mm �~ K~.W ��.�.� 68 (RCN) Western r J-cwdar• 10 x 6S(LM (RW; •lir r;0 22 x 70 (UH1(RW; ,...^nuglas 14 Autumnal#s cnen-y 6 7 3 ... . ........,... ry ; x I Western hem,o;:k 3 x 72 (LPI') (RW; ' DDug€as•iiir 3z 17 jx 73 (� LA'.j [iV) Uo�gSai•Sr 3.•"......"...1....... 26._....I X i 7c [R1h'} _—.L-- 31ack rottdrwooc c - ..... 9 I ld ?m x '• _. - - Pw�>Ex strxgn : p. LSyk7 orwc A. LY S: ,i JATU 6�y R FQ70 REY:5IGM1 F3Y DATE. APPR Tree No. I Species -.480ow :1 20 0 11) xo 40 GRAF'!•!IC SCALE SCAM: r -W LEGEND UH = UNHEALrHYPANGFROUS TREE (PER ARBMST REPORT) :AI LANDMARK TRE DIAMETER €LACHES O" TRUNK DL -DMPL'NE AS RAMS €N• FEET FROM THE TRtAK :'L = PROPSR1Y UNE RW = TlEc LOCATED IN R€GHT-CF--WAY AC = TREE LOCATED IN PRIVA E ACCESS TRACT Cl TREE TO SE RETA11NED C) TREE TO 13E RCrr?0VF-5 OLS iE SiGNIFICANT TREES 39 ON,_SITE EAWDMARK "BEES 12 04 SITE DANGFROUS/R: Ht OF -WAY TREES rr 23 TOTAL TGNIFICAN7 &rviANDMARK 51 PROPOSED RETA€NED 'PEES 12 PROPOSED RETA€NED '€REES 24% SEE ARBOR•:ST REPORT PREPARED PY; GREENFOREST, INC. 4547 WJTR 1:0(Ak.E SLRF,r`.T SEATT E, WA 981'.8 SEE LANDSCAPE PLANS F'JR TREE PLANTING 1D 8i 3eaf--n le € PL . p g 7t. UL £ 3 DL 1 Douglas -fir PL DL DL DI - I 14 14 Douglas-fr 1 PL DL DG DL 15 3(L'rl) 25 1 paugias-f;r 3 D;, pL Vdestam r �•Ledas Dt OL Black pine SPI. __.DI, i p,, Di f]? pl- ],s DL 3 18 DL 10 26 Western red -Leda- PL DL DL Di. 14 27 yL!.9) FYastern red-c¢dsr l7i CTL GL C= ]!.. • 57 {LV1} 58 ' Wzs;em red -..odes r DL DL . .............. £ weSIQm red�edlr ❑_.— PL ?L PL .. ➢L 17 D; ai 5€3 Wascem red,edar DL DL - PL .._ 15 CITY OF R up �i EN I G Plas:ning/5u€€ding/puCl=C Works ❑rtpt- IN COMPLIANCE WITH CITY OF RENTON STANDARDS GREEN'S LANDING SHORT PLAT PREUM [NARY TREE RETENTION PLAN 1--1 1 •-zo 1 c� If 0 r� V z 0 z d Lij Lij rm V I T C$ X33 CONTECH CDS 2015-4 OR APPROVED ERUt ' NT FOR PRE-TREATIVENT Lo,r 2 Q0 LLJ LU r� VJ . , . 3 •: �: CFvif �n�lrec, Tire•_, , er"', :.�.�' fyd�nnir7y ��nr.a7r=_; r::s A L :.aT 3 ca ,#12 STORMTUC i CHAMB S .r . •.. C9 ,15 LOT 1- • .• ce,7i . --ISN-Al,ON ROW B 1S I Tom_ i -- _ ----- --- - rA Al: _--------. `f SSY -... S - r----�- I g LOT 4 .V INFILT7RAION TRENCH f J•../..`• 3 tR'fRAT'1GW TPE" 0#>-O= emmm" ? : CLEAN, CRUSHED, ANGULAR S"ONE [77.51 X 22.75'W X 5.5'H7 d t 3iAMHRS• 6 ENC CAPS C C�i 3--SSBtATICN POW, 2-iNFILIRATIONCHAMBERS TOTAL LIVE STCRrkCE RERUIREu: 4,9$o CF TOTAL LIVE STORhCE PROVIDED: 5,910 Cr SYSTEM OVERFLOW ELEV: 412.75 1NHLTRAMON TRENCH NM PLAN ViEW 8-3 N.T.S. r r , sraccnar:o I alrcos m�_ �� �wliHceR.Y.u++Ltr' -----€ ----- --- - + -^ ;MILr�'LF.'s+l.k: I^"�LF ':lkT Mx $ � •�h'EliF JK 4 ELEVATION A A CB #13 (DS 2015-4) NITS._ og N6.y� SF rc 1LK2CiY 'r-+niv� lw[A?ifE_' T lAC.�rL' I.'. u�: l'z:ia,aM jj,c+H pfRISLAI. REc41nn[+'+s w�% I,M� IS FE fax 3+rtN4� oro Y^•=N•a-ry:s so c cis gas I_s;. � r�E n,E c...�ccncc+e ex�r=.c �:a;ra1 u� css. wv �Ps�urh crznss s-z�..�e Is �eau:r<c ^.i. S:xfu.FRD C�:Tltrct �v;RF: ahA��AI l9 sKpM:.tL1-e;i�+0.:F SCM F�P.nC+I� h F •.V+�:RdLF AtiI: hFf Js�'cF H`:'-fJ•'.:'.�Ff SE�rns, C OKFR3ull;'S10 N❑x5C W TION ----------------- Iia.rwT h EE:...-.,...-,...-_""_......"."._""."..".......-'______._..---------------..-..------ CB ¢18 CB g6 FIGIiRE C.2.1',,k PERFORATED PIPE CONNECT104N FOR PORT10N OF ROOF :3CNE"�,'AL NOTES 1. CV[JTECW "� PRON7E ALL MATE S2IALS UN -E65 NOTLD O1}4ERWh:SE" 2. D11,9E.NSfONS WIARKED 4MTH () AR'c REFER FNCF, whtFNSSDi25. ACTUAL OIN1FtiS'sONS MAY VARY" FOR FABRICATION Dr7AW N-!3 IiMT?3 ixTAELED STRUCTUR'c ❑EMF.N 4I Nr AN:: JVE IGHTS, ?1•FrASF CO:sTACT YOUR CONTE,.H FNG;NH-,RED 50L11710h111 L_C REPRESEITAIIV=- ti W -Contact s-: h" �"-DS VVA7'fR QLWU7'e S71iCCiiRV SfL4Li 13L 1N ACCORDAACe mg -1i ALL DE51aq DATA AND iN=•ORIAATiON CO3L'TRi •_^.:N 1'hg5 Cc2ANNC;" 5. STRUCTQRF SttALI MEET' AkS,HT4 HS20 AJ7 CA9P.;JGS SiiALI_ MEET idw26 �HTO M 306} LOAC FrATiN3, ASSt N1fNG GRO.3-T 7 5'ATE.R ELEVATION AT, OR ELLOW. THE VUTLET PI PE s?aV tr 1=LEVA"]U?r•" ENGINEER OF 3�CORD TO CCNF;i?t,^: ASTLJAL C':ROUN V ATEfi ELEVATION" 6. P'JC HYCRAIJUC, SHFAR PL.'T`c [5 PLAC F.v ON SHELF AT HOTTpW1 OF SCREEN CY€ NDER. RE190VE AND RFP",ACE AS NE, ESSARY Ck7RfNG T,IN-STEN 1NC E L:LEANI NC " INS'€'ALLAiION . QD T ES A" ANY SiSR-PAS.`., BACK!".L DtPTH, AND7OFi ANTE-FLCTA-10N' RkOV1SEQtiS ARF. SIr^SITEC3F:C DES133.3 CONs;Dc-RATIONS Ptir] SHALL, BE SPEi:fFtFD sIY ENGidFER OF RF;CCRD. 3. C'INT-RACTOR TU PROVI D] EC`UI Ph1ENT W17H PUFFECiEN7 LPTI NG Av D lk O, CH C.APN'ITY l'O JRT ANC SEI' THE COS MANHOLE 37' UG`URE 0 FT CLUTCHrS PROVIDED]" C, CONTRACTOR TO ADI) ,K3l NT ScAeJ1NY SET6tlEFN All STRU=URE SECTIONS, AND A,' FEMBI, F. STRU TURE s7, 0ONTRAC:7OR TO PROVIDE, INSTALL, AND GROUT PI PCS. NA7C:"ri NP,-, INVEriT:i WIT3i ELEVATIONS SHOV%N. Cl :v'TRACTOR TO TAKE APPRO-RIATE MFh5URIS 7O ASSURE. LIN; 7 E'3 WNA�1``�R :'IGzr, HOLT 4G NATER TC FLQVrUNE tNV� R'T WSJ NWTU4t IT 1S SUGGRSTFD THAT ALI, JOINTS B --LGN PIPE INFVFRTS A.R�-. GROUT:,O, MAX 29% SLOPEH yH/yaYwiN�;�ti --VAX tS% SLOPE 6, mix - 42' P111F PIPE •y ��+ii�y►F'' f���lrf�s �yy TRENCH CROSS 5ECnON '""" 1•=20�' CITY C D LYCdH "tl"0 FL LY ' R U TO N t Vat HHs �Jt•S ' j• � '�� Planning/Bl:iding/Ru31ic Ylorks dept REVl5i0, i SY DATE APPR Nm U 1 R_.... IN COMPLIANCE WITH CITY OF RENTON STANDARDS Q x CY3 z GREEN'S LANDING St•IORr PLAT i..E.l INFILTRATION TRENCH DETAILS rc t.l.€ LLI 03 IV€C-35q TECE' LAICAL SPECIFICATION vA�LeY '4�'' „ 85A" I218•i mm) ::r:Fr•=IING 13 •caesr INSTAI,-ED CREST M* . r:FCENING 40 _Ly,-[rH —T •[�xR :'Fvi1x�' i s i t 1 I j • � FO'vi , UCAYDN BJI',Q Rg/� IN T'H15 EGSL 71' b - , 65 -D - is (1558 rr>ss># 1950 mTrd ,M1 PNL L:-0A.MSRR °.,P -r l:W-nON3 52i illi%3XIHSTA_L[D:c�F'.T•sJ 'iT.y XnWXS9.:Y •i'.{i,S sX t:a3 n•mX21K� U—,CRSrOW:CE :f9NGN91G�EE?' 33.11 rf; rcNxl.l ss�nusosnxnc.=-• lreseu�r peer i= -os M3 Y[EIGNT 1-tin'LR*. E61•'+ky! N0.111hN1. END OAP SPECIFIGATGRS hrr WJ it lr,l- LED 7A, X•FiJf X22.i :1:3. X!:tient-,A P, rn' lNu [;nPs'=AC-£ 14.9CtrE^.f: ZEST ELC r-6 MIGHT 123.7 kA •AS •WA---c'12';9.5mN`ST.'ANZ nFr•T,'E, C in'rru-TQ:ti FCL NCATFiN Azle 8TW VI CHAMUE ` 1:' {31 m- GTLIN� PENriIETER i4 FRCN7 OF F -NDC, Ati 41-%G, _ E nRGSIR, ni!_:nTe::1'!GkCF £nl]cAP F[]R P.iRTNGI,eCtR.^� Vii, VAC lY' PARTS STUB S C I~"Inr��initFFcer ..},..... ..... 33.i:• iedi �%_f.... ".." ... i [mW a [�iSmIEi1%Wx3 I G'i15C, d 12' {706 -mm) h9N ••--------T—� EL.EV=431.75 nc lli m+N •k:LisiY IFIF FFm'. n',�.^C rnN ts•{!.•. sir -y - •�•iALYNIEHVT]?' t� l=•'�. MrrY =S,?t'[!]drriry - NIA IIJSTALLA rION8 MAY S-iAVFF rrI NI SHF? GRADE ABOVE_ NOTE THAT € PAVEMENT SU3GRAIDE. REC2UIREMLNTS. 11CS5CGiEPP51T . [ •TTS ......-r.........-.............. - t1: 4`%`G�E•'P1 )fi PREPARATION RPal1EREh1CN'i5. ....................... BY SITE DESIGN E,IGENEER (23C:nm} T7' (31) Oro lYP mr,R,Prr xx::.54oxrrlse II ANYVALLF:' N• n - : ............. M43`.LGiE FFSaTC•� ��'EN C is IONS AFTER 2h" [^�7A 2unL" [Y.s n!�) AASHTD 7A1M15' :C :esti x.nJ CAYF.R'C' STAR'S ! stOiR TI•IE TOP OE G:LiNESLAR WE LE: GRACED SO;E.;f.GGREGATE n:Ei=oCIEFFnL!i: � f1[�uIEPP)�M. 2�' IGGC.-sen• 19 � Ii�o m - - _ _ �1C5%NIE�P3CNC :,FJR171`JWiL LAYERS E[Q :2" 3;70 Ann. [ } [ C OTO 24' (5Gfl run) ABOVE THE TQ OF AGGRCC-ATE- N K:—C9,IENSI014 iE11— ,L2 4 r'•1E:4'R IEOt?snsERL',T1li o�N'2nk! Ef,: laJ4 r•151HotiwW..oLwxwuC-t :;.-2r{�I-Ern3.`,F/-E:lti SIZE 7mrEANPGS [.j"10 ] 'Icr:LENEF FL ARE vti5 IN•E i1) .ISRN ON1 �' r1r:35u1• ENS] �hP Ci1T IY PIE Fi^:]FRE 4Ci REGUYAUEN.'Ych. uR P rkT=A,RE4"EF'v U 1q UA . S Ty-, ai�•ERT CfChila' iK �ee�rLY'tr AR_ lkf IiY-ViT=.^,r f S�iLLE f[::t THE DIVE NITS $,UNEP DFPT3d TE37 BY DESIGN, VNGE1lrTFR CAT CN SA$13L OR gkA iHO_E 50.D" [2266 m a AS,TUAL =_F. NGTH 22.5" {571 mrr) ••- ??SSTALL 'D z5 -r• T (653 mm) COVER EN71R� ROVd WAFTK AASHTCO N12dB CLASS 2 NON,VVCVEN GEOTEXIr LE, WC -3507 ••'.7.5' [3.,31 :n] WTDE STRIP ACCEPTABLE FILL MATERIALS: STORIVITECH MG -3500 CHAMBER SYSTEMS �. -..,....-..v.••_..._._E• ~��.� ....". ."MA,0,SPTD -MAI C£7),SPAC_nON i PEkiS:',Y PFA,3r_R€AL LCGAT:PN j SSC: -•N' i'T1ON Cl1iSSIF1CATSONS RERVIRFPFF.?ST �......................"...V. I:/:L. EL3.=1ff 01 TE2I FCA �...... .m. ....-."... 12' {706 -mm) h9N ••--------T—� EL.EV=431.75 MER'.^,' STARTS FR1, THF. TL7P DF = T -- GRANULAR WF{ -1, C':L'k EC S£�I? : 45- FRF.?ARF. PER 5[r !THE''C' LAYER TU TFE BOTTOM OF :ANY =UROCK MA'r E1:IF.LS, NAT' SOILS, OR [F1C7 nsn3 ENGINEF. R'S PLANS- PAVED D �FLEX16LE PAVE.,..EN'FOR UNPAVE PER ENGJN_-ER'S PLANS. COCK FUNS FCR NIA IIJSTALLA rION8 MAY S-iAVFF rrI NI SHF? GRADE ABOVE_ NOTE THAT € PAVEMENT SU3GRAIDE. REC2UIREMLNTS. ^`��' ry SYREWGiN_, MATER€Al_ AND AVE,YIEhT SUBBASE K4Y H=.. PART Fes.: -:.. i' ...... 3-' 3•, S" A•1EN PREPARATION RPal1EREh1CN'i5. F' THE'D' LAYEf{ BY SITE DESIGN E,IGENEER (23C:nm} T7' (31) Oro lYP II ANYVALLF:' _ •_ M,• ..__.••....._-.......... Y-..... ��'EN C is IONS AFTER 2h" [^�7A �MI TAL HLL: E:LL M"LA V-?; OR AASHTD 7A1M15' mrr ; Or" Sr,ATERkAL OVER THE CAYF.R'C' STAR'S ! stOiR TI•IE TOP OE G:LiNESLAR WE LE: GRACED SO;E.;f.GGREGATE A-1, A•2-4. A-3 CHAMBERS EG RIE -ACHED- COMPACT ;THF. EIA3FDR:F.'dT STON.==. ['B'tAYERI N$ X s IJRES, �335k F3NES OR PRO:,FSSFD :,FJR171`JWiL LAYERS E[Q :2" 3;70 Ann. [ } [ C OTO 24' (5Gfl run) ABOVE THE TQ OF AGGRCC-ATE- OR r MAX LIFTS TO A MEN- 35Y PROCTOR ! CI,AV:¢E?2-!4S3TE 7iiA7 AVFNF.NT SV¢E3A¢E h1AY ¢E A PART' : EVENT [,E;)51' P,kVEMENT SU&FJASE MATERIAz 9 CAN ,AASH "O MM3' i D-N511Y FOR WELL GRADED MATFRIAL AND s38%RE_ATIVE OF THE BE t:SED IN:EFF; OF THIS LAYER, 3, 3 1, <, E57, 5, 59. y7.5, �7. F7,. {j DENSITY FOR PROCF 5GSED 7, 78, El, 1;5, S, ID £AGI FEE AKTERIAL¢. �hT6Eo IIEStxb7G1cE: FILL _ -___........,.... W^EGA r SIJRrZ.-YUNpI:r'G THECNWhri3ER5 F-�.'C3N1 f B ., C:.F.AN: CRLiSHEC, ANGUEAR S DM1r AASH30 Xk331 10 OMPAO', CON REQUIRED. i _ s TnE f=7:FNC7AT.lp!S STONE (A' LAY=--'�3 � 4OO TF'E'C' LAYER ABAVM................._..�- 3� 4 6t1'JQRi�T6N S7Y3NE: FILL BELOW ---- ^ ' f A 1CI-LVMIE, ERS F:TCN1 3}{E 8UEK� ia37E UP 3AASHTO Ci,FJiN, CRUS:'iEc7, ANGU:AR STDs M431 ' PLATE COMPACT OR;*- 7y,)ITO 7HE FOOT (50TTCNI) OF THE 7 1.4 ACHIEVE A FLAT SURFA.0 E- r' j1) AShBEfi. 1 .. .......... ......................... ..- P;,EASE NOTE 1- TK LISTED AASHTO DESIGNATIONS ARE FOR (MADATFONS ONLY. THE STONE MUS: ALSO BE CLEAN, CRUSHED, ANGULAR, FOR EXAMS'LE, A SPECIFICATION FOR #4 STONE WauI_D STATE: "CLEAN', CRUSHED, ANOU£ AR NO- 4 (AASSITO M43) STONE', STORMT.CH COMPACTION REQUIREMENTS ARE Ms: FOR 'A' LOCATON YEATERiALS WWN PLACED AND COMPACTED IN 9' (230 mm) (>AAX) LIF"'S USING TWO FULL, COVERAGES SMITH A VI8RA`ORY COMPACTOR, 3, YiE*NE' INFILTRATION SURFACES MAY EE COMPROMISED BY COLIPACT;Q.,E, FOR STANDARD DESIGN LOAD CONL`I110NS, A RAT SURFACE -MAY BE ACHIEVE:] BY RAXIN; OR DRAG3INC WITHOUT COMPACION EQUIPMENT. EOR SPE,"•.AL LOAD DESIGNS, CONTACT 5iORmi-ECH FOR COMPACTIGN REQUIREMENTS. ADFj ,Fi7SYNTHFT CS S7±T ND?.}FVDVL-'H Gr_olLXT1L ALL PAVEMENT LAYER (DESIGNEE) BY ARO Vv CLEAN, CRU5i+E D. A.I.+ IALAR STONE 1N A 5 B SAYERS �j, FATE .)ESia?5 .'h311+C- ERJ I PERIVIFTFR STONE SSc'.F NPT'c 5] EXCAVATION SHALL (-:.AN BE Si,DPED OR VE12T1CAL) G -{15G: ENL` CAP {SF.F NOTE 4) OR CUVcR QEPTHS GREAT ER 'HtAN d_or ,2-4 Tn) PLE'ASE CONTACT' ST'QTdTF.Q H NCS:�_ MC-55OG CHAMBERS SHALL CONFORM To THE RE[A;tR€MFNTS OF' kSTM F2.418 "STANDARD SPECiF1CATION rER PI)€_YPROPY_ENE (PP) CORRUGATED WALL STORMWATER COLLEC ON QHAMBERS". 2 Mt; --3501) CHAMBER$ SHALL BE DESIGNED IN ACCORDANCE W11H ASTM F27B7 "STANDARD PRACTICE FOR STRUCTURAL DESEGiN OF THERMOPLAST?C CORRUGATE -D WALL STf)R41WA rR C7LJ"F.0 CN CHNMBERS'. 3, "ACCEPTABLE FILL MATERIAL5" TM_E ABOVE. PROVIDES MATERIAL LOCAnON5, DESCRIP?EONS, GRA7ATiONS, AND COMPAC11ON REOUIREMENTS FOR FOUNDATION, EMBEDMENT, AND FILL MATERI&i , 4, THE SERE DESIGN ENGINEER 15 RESPONSIBLE FOR ASSESSING THE BEARENG RESISTANCE (ALLOWABLE BEARING CAPACITY) OF THE S08mev)E SOILS AND THE DEATH OF FOUNDATION STONE WITji CO1S30ERATiON FOR THE RMGE OF EXPECTED Wk, MOISTURE CONDITIONS, FERIME7E2 STONE MUST 3E• EXTENDFI7 HORIZONTALLY TO T7{E EXCAVA70N WALL 5 -OR BOTH V%Ri:CAL AND SLOPED EXCAVATON WALLS. 5, ONCE LAYER -C' IS PLACED. ANY SOIL/MATERIAL CAN 8E P:ACED IR ;AYER 'D' UP TO THE FIiJISHED GRADE, MOST PAVEMENT SUBBASE SOPS CAN BE USED 7O REPLACE THE MATFR3AL REQUIREMENTS Or SAYER 'C' OR 'G' AT ;KE siTE DESIGN ENGINEER'S o'.SC:RETEON. N'YLCPLAST 52" ]3M ENoj INL'NE DRAIN ¢GL -Y eL'! 12'[30D m11118J_Iz)Hlti.iS_fJ 00,V -R AND PRAAIE. E5i.k: FirI.JPi.AS�E' (YNGC l 7(I'-3•°1- A FOR PAVED APPLICATION f SE= CIVVG# TC03-i 1M45 I: DR U'T AVED AF PLr,A:IONS) E-7 LAYER S Of AASI?TG M288 CLASS 1 WOVEN GE-OTEXTILE 24" (560 rn m? HDPE ACCESS PIPE REQUIRED)BETWEEN FOUNOATiON STONE AN7 CHAMBERS, VSE FACTORY PRE -CORED ENR CAPS. VC -3500 - 8.25' [2.57 m] WIDE STREPS ?,TOTE FOR MANY A%+AUCAT:CNS, THE NON -WOVEN GEOTEXTkE OVER THE AEC -3500 CHAMBERS CAN BE Fl..1MINATED OR SJBSTTUTEC WITH THE AASH'.G CLASS T WOVEN GEOTEXTILE. CONTACT YWR SlQRMTECH R£PRESE:NTATWE POR ASS]STA?:CE- ISOLATION ROW DETAIL $ 'd:G]�t31 ��-f 32 5 ssyy 7�;[ Cirri! �ngin�Fr)n-y w • is .... �� ❑lsnninri Can�srl3�r!_:: (�]l ��� NO - r4c-3500 CHAMBER 3', - 2 '.NCH ;19 1nZ- 51 CLPAId .^,RU51EA ANi:IAAy 31 AASH fG kf2&S :,'?,:1)$5 2 NnNkY:)VFN GECTEXDL= INSPECTION PORT DEML -0";?i•1) ar^ Si: Fi£:f1 �kS SCREVV:N CAP NOTES: ELEV=424.00 (Mft) 1.:NSPeCFIr7Y POR7TS PAY 33f: NFC -FLT :HRGL-Dl ANY OF (8) (2-4 M) 1Hi'R GORsi:sCiA7fON'JAI._ '!5 -CGrzC RST=CDL:-p.3 MAX OVERFLOW ELEV=412.75 Q ---- 12' {706 -mm) h9N ••--------T—� EL.EV=431.75 �•', 4" [1'M mm] SCHED 4C PV!: -- GRANULAR WF{ -1, C':L'k EC S£�I? : 45- HC�;RFGA'F A'1:K7LiRE5 � [F1C7 nsn3 i G" El OD corn] SCf iE'D A9?VC 1)0:3PLSNG B., w•- ELEV=• .1)B.�a ^`��' ry w.F. OF PTH OF S7ON� BE DE?'EF:M;NED Fes.: -:.. i' ...... 3-' 3•, S" A•1EN 9„ 123V Win] MIN •• 77" i195.fl TETT) •— BY SITE DESIGN E,IGENEER (23C:nm} T7' (31) Oro lYP OR CUVcR QEPTHS GREAT ER 'HtAN d_or ,2-4 Tn) PLE'ASE CONTACT' ST'QTdTF.Q H NCS:�_ MC-55OG CHAMBERS SHALL CONFORM To THE RE[A;tR€MFNTS OF' kSTM F2.418 "STANDARD SPECiF1CATION rER PI)€_YPROPY_ENE (PP) CORRUGATED WALL STORMWATER COLLEC ON QHAMBERS". 2 Mt; --3501) CHAMBER$ SHALL BE DESIGNED IN ACCORDANCE W11H ASTM F27B7 "STANDARD PRACTICE FOR STRUCTURAL DESEGiN OF THERMOPLAST?C CORRUGATE -D WALL STf)R41WA rR C7LJ"F.0 CN CHNMBERS'. 3, "ACCEPTABLE FILL MATERIAL5" TM_E ABOVE. PROVIDES MATERIAL LOCAnON5, DESCRIP?EONS, GRA7ATiONS, AND COMPAC11ON REOUIREMENTS FOR FOUNDATION, EMBEDMENT, AND FILL MATERI&i , 4, THE SERE DESIGN ENGINEER 15 RESPONSIBLE FOR ASSESSING THE BEARENG RESISTANCE (ALLOWABLE BEARING CAPACITY) OF THE S08mev)E SOILS AND THE DEATH OF FOUNDATION STONE WITji CO1S30ERATiON FOR THE RMGE OF EXPECTED Wk, MOISTURE CONDITIONS, FERIME7E2 STONE MUST 3E• EXTENDFI7 HORIZONTALLY TO T7{E EXCAVA70N WALL 5 -OR BOTH V%Ri:CAL AND SLOPED EXCAVATON WALLS. 5, ONCE LAYER -C' IS PLACED. ANY SOIL/MATERIAL CAN 8E P:ACED IR ;AYER 'D' UP TO THE FIiJISHED GRADE, MOST PAVEMENT SUBBASE SOPS CAN BE USED 7O REPLACE THE MATFR3AL REQUIREMENTS Or SAYER 'C' OR 'G' AT ;KE siTE DESIGN ENGINEER'S o'.SC:RETEON. N'YLCPLAST 52" ]3M ENoj INL'NE DRAIN ¢GL -Y eL'! 12'[30D m11118J_Iz)Hlti.iS_fJ 00,V -R AND PRAAIE. E5i.k: FirI.JPi.AS�E' (YNGC l 7(I'-3•°1- A FOR PAVED APPLICATION f SE= CIVVG# TC03-i 1M45 I: DR U'T AVED AF PLr,A:IONS) E-7 LAYER S Of AASI?TG M288 CLASS 1 WOVEN GE-OTEXTILE 24" (560 rn m? HDPE ACCESS PIPE REQUIRED)BETWEEN FOUNOATiON STONE AN7 CHAMBERS, VSE FACTORY PRE -CORED ENR CAPS. VC -3500 - 8.25' [2.57 m] WIDE STREPS ?,TOTE FOR MANY A%+AUCAT:CNS, THE NON -WOVEN GEOTEXTkE OVER THE AEC -3500 CHAMBERS CAN BE Fl..1MINATED OR SJBSTTUTEC WITH THE AASH'.G CLASS T WOVEN GEOTEXTILE. CONTACT YWR SlQRMTECH R£PRESE:NTATWE POR ASS]STA?:CE- ISOLATION ROW DETAIL $ 'd:G]�t31 ��-f 32 5 ssyy 7�;[ Cirri! �ngin�Fr)n-y w • is .... �� ❑lsnninri Can�srl3�r!_:: (�]l ��� NO - r4c-3500 CHAMBER 3', - 2 '.NCH ;19 1nZ- 51 CLPAId .^,RU51EA ANi:IAAy 31 AASH fG kf2&S :,'?,:1)$5 2 NnNkY:)VFN GECTEXDL= INSPECTION PORT DEML -0";?i•1) ar^ Si: Fi£:f1 �kS SCREVV:N CAP NOTES: 1.:NSPeCFIr7Y POR7TS PAY 33f: NFC -FLT :HRGL-Dl ANY OF (8) 1Hi'R GORsi:sCiA7fON'JAI._ '!5 -CGrzC RST=CDL:-p.3 .f 2. ALL PVC F ITT4N0S.t=iE'e O ¢E SOLVENq t:F6L-riTED -FAVEMD,71' �•', 4" [1'M mm] SCHED 4C PV!: -- GRANULAR WF{ -1, C':L'k EC S£�I? : � HC�;RFGA'F A'1:K7LiRE5 �/ i G" El OD corn] SCf iE'D A9?VC 1)0:3PLSNG B., _ 4" ; i n1m] SCI{ED 4C F'VE: [`CJ7'f!i11] f CORE..S" [F5-0 rn.^I; 0 ATOLL= & •NA93CR ib 5" I•iCLf; SA41' REG'D? IIIIIIs II ANYVALLF:' LOCATIONS C:]NNE.CTI:7N ❑F A:L rekxsew sullen „�„: p. LYAhF orAt A. 1.N, ar — J. FEND Ely OATF APPR REVISION CITY OF RENTON Normmg/iiuildinq/Pu6iCG Works Dep( IN COMPLIANCE `,MiTH CITY OF RENTON STANDARDS GREEN'S LANDING SHORT PLAT INFILTRATION TRENCH DETAILS --11--2018 I 1 r Q 0.. F -- Q cf) 0 z Q LIJ to w R Storm Rater Poi.tution Prevention Flan for Construction Activities APPENDIX A NPDES STORM WATER PERMIT, AND STATE WATER QUALITY STANDARDS This ,project will disturbed more than 1 acres of land, NPDE S Storm water permit is required. Enhanced Basic water quality treatment is required per City of Renton Stormwater :Management Manual which meets the requirements of State water quality standards. Pacific Engineering Design, LLC. Storm Water Pollution Prevention Plan for Construction Activities APPENDIX B STANDARDS AND SPECIFICATIONS FOR SELECTED BMPs Rel'erance the 2012 WSDOE Manual as amened in December 2014 for the following BMPs 1. Mark project clearing limits BMP C101: Preserving Natural. Vegetation BMP C 103: Plastic or Metal Fence BMP C104. Stake and Fire Fence BMP 0233: Silt Fence 2. Establishing the construction. entrances) BMP C 105: Stabilized Construction Entrance BMP C 106: Vi, heel Wash (wet season only) BMP C 107: Construction Roa&Parking Area Stabilization 3. Storm water detention Onsite Detention/wet vault to provide Level 2 (forest existing condition) Flow control 4. Selection and installation of sediment controls BMP 0200: Interceptor dike and swale BMP 0207: Check clams BMP 0233: Silt fence BMP C240- Temporary sediment trap BMP 0250: Construction Storm water Chemical Treatment 5. Soil stabilization BMP C120. Temporary and permanent seeding BM11 C121: Mulching BMP C123: Plastic Covering BMP C107: Construction Road/Parking Area Stabilization G. Slope protection BMP C120: Temporary and Permanent Seeding GMP 0121: Mulching BMP C130: Surface Roughening Pacific Engineering Design, LLC;, Storm water Pollution Prevention Plan for Construction Activities BIMIP C131: Gradient Terraces BMP 0200: Interceptor dike and swale BMP 0204: Pipe Slope Drains BMP 0207: Check darns 7. Drain inlet protection. BMP 0220: Storm Drain Inlet Protection S. Storm water outlet protection BMP C220: Storm Drain Inlet Protection WET SEASON REQUIREMENTS Any site with exposed soils during the wet season (October 1 to April 30) shall be subject to the special provisions below. In addition to the FSC cover measures (see KCSWDM Section D.2.1.2, p. D-12), these ,provisions include covering any newly seeded areas with. mulch and identiA ing and seeding as couch disturbed area as possible prior to September 23 in order to provide grass cover for the wet season. A "wet season ESC plan" roust be submitted and approved. by the City of Kent before work proceeds or continues. Wet Season Special Provisions All of the following provisions for wet season construction are detailed in the referenced sections. These requirements are listed here for the convenience of the designer and the reviewer. 1. The allowed time that a disturbed area may remain unworked. without cover measures is reduced to two consecutive worming days, rather than seven (KCSWDM Section D.2.1.2). 2. Stockpiles and steep cut and fill slopes are to be protected if unworked for more than 12 hours (KCSWDM Section D.2.1.2). 3. Cover materials sufficient to cover all disturbed areas shall be stockpiled ozm site (KCSWDM Section D.2.1.2). Pacific Engineering Design, LLC:. Storm Water .Pokition Prevention flan for Construction Activities 4. All areas that are to be unworked during the wet season shall be seeded within one week of the beginning of the vet season (.K.CS WI)M Section D.2.1.2.6). 5. Mulch is required to protect all seeded areas (Section. D.2.1.2.2). 6. Fifty linear feet of silt fend: (arid the necessary stakes) per acre of disturbance rust be stockpiled on site (KCS WDM Section D.Z. I.3.1). 7. Construction road and parking lot stabilization are required for all sites unless the site is underlain by coarse-grained soil (KCSWDM Section D.2.1.4.2). 8. Sediment retention is required unless no offsite discharge is anticipated for the specified design flow (KCS%VDM Section D.2.1.5). 9. Surface water controls are required unless no offsite discharge is anticipated for the specified design flow (KCSWDM Section D.2.1.6). 10. Phasing and more conservative l3MI s must be evaluated for construction activity near surface waters (KCSWDM Section D.2.4.3). I l . Any runoff generated by dewatering may be required to discharge to the sanitary sewer (with appropriate discharge authorization), portable sand filter systems, or holding tanks (KCSWDM Section D.2.2). Pacific Engineering Design, LLC:, Stonn Water Pollution Prevention Plait for Consmiction activities APPENDIX C MATERIAL SAFETY DATA SHEETS Pacific Engineering Design, LLC. Stonn Water Pollution Prevention Plan for Construction Activities Emergency Phone Numbers Fire, Police, Ambulance y 91 I ouxter: Ethiopian M.Lislirn Association of Seattle (206) 424-2940 General Contractor Office: Site Mobile # Subcontractors Stib 91) Sub 92 Office: 43 [Sub Soil 14 ..� ._.....,,.. ._............_... ` City or Cousity ContactSpill Hotline: (206) 973-4774 King County 24-hour dispatch: (206) 294-8100 Washington State Ecology Dept. (360) 407-6000 (Olympia) WYY (425) 649-7000 (Bellevue) Pacific Engineering Desip, LI,C. Storm Water Pollution Prevention Plan for Coustmaion Activities Spill Report Form LOCATION: Date: Time: Regulatory agencies notified (date, time, person, agency, and Iiow)-. Material Quantity spilled: Source: Cause: Extent of injuries (if any): Adverse environmental impact (if any): Immediate remedial actions taken at time of Measures taken or planned to prevent recurrence: Additional GCfn7irlCntS: ------------------ This report prepared by: _-----_ (Signature) Pacific Engineering Design, LLC. Storm Water Pollution Prevention Pian for Construction Activities Storm water Monitoring Form PROJECT: RECEIVING WATER: :Monitoring elate: -- -- - Current weather conditions: Previous 24-hour w=eather conditions: CONTRACTOR: MONITOR PERFORMED BY: 'rime: 11 SAMPLING POINT I TURBIDITY (N'F'U) Il UP -Stream Adj acent Downstream Comments: Sampler's Signature - signature print name Pacific Engineerixig Design, LLC. Storzn Water Pollution Prevention Ilan for Construction Activities Table I BMP Maintenance and Inspection Schedule (Source Control BMPs) The Development Company .Anywhere, USA BMP BMP Namc7 Recommended Maintenance Recommended Designation Schedule of Maintenance C101 m Preserving Inspect flagged areas to make sure flagging Daily Natural has not been removed. If tree roots have been Vegetation exposed or injured, recover and/or sea[ them, C102 Huffer Zones Inspect the area frequently to make sure Daily flagging remains in place and the area remains undisturbed. i C 14 3 Plastic or If the fence has been damaged or visibility Daily Metal Fence reduced, it shall be repaired or replaced immediately and visibility restored. C104 Stake and If the fence has been damaged or visibility Daily WW_ Wire Pence reduced, it shall be repaired or replaced immediately and visibility restored.. � CI05 Stabilized Quarry spalls (or hod; fuel) shall be added if Daily f Constniction the pad is no longer in accordance with the Entrance and specifications. If the rock (or hog fuel) Tire Wash I entrance is not working to keep streets clean, then install wheel wash, sweep streets, or wash streets if wash water can be collected. C 106 Wheel Wash Wheel wash water shall not be discharged into Daily a storm drain or the site's storm water collection system. Use closed-loop recirculation, land application, or discharge to sanitary sewer (by permit). C L07 Const. Road Inspect stabilized areas regularly; especially Daily Stabilization after large storm events. Add rock (hog fuel), D-avel, etc. as needed to maintain a stable surface which wont erode. C120 Temporary & Re -seed areas failing to establish 80% cover Inspect to ensure growth Permanent within one month (during growing season). If weekly Seeding re -seeding is ineffective, use sodding or netsNankets, Eroded areas shall be corrected, re -planted, and irrigated as required. C121 Mulching Maintain specified thickness of mulch cover. Weekly and following I.roded areas must he corrected and re- Storms mulched. Drainage problems must be corrected. Pacific Engineering Design, LLC. Storm Water Pollution Prevention Plan for Construction Activities BMP BMP larne Recommended Maintenance Recommended^T Designation Schedule of Maintenance C122 Nets and Inspect to ensure good contact with ground ~ Weekly and following Blankets and no erosion of'soils. Replace damaged storms i material and re -staple where required. Correct erosion problems immediately. mm C 123 m Plastic Replace torn sheets and repair open sea rxts m Weekly Covering Replace deteriorated plastic sheets. Dispose of plastic when no longer needed. C124 Sodding If sod is unhealthy correct problem, If sod Weekly and following can't be established seed area and use net or storms blanket to stabilize soils. 0125 'Top Soiling Inspect stockpiles regularly, especially after Weekly and following large storm. events. Stabilize areas that have storms eroded. C 126 E Polyacrylami Reapply PA?vl to actively worked soils at 48- Daily de hr. intervals not to exceed 7 application per Application f month. Reapply PAM to undisturbed soils at 2 -month intervals..- ntervals.C130 C130 Surface Seed roughened surfaces as soon as possible. Weekly and following Roughening Re -grade and re -seed any areas beginning to storms erode. C:131 Gradient Maintenance should be performed as needed. Annually and following Terraces large stern. events WYMC140 ^Dust Control Re -apply dust control measures as necessary to Daily dw-ing dry keep dust to a minimum. weather Pacific Engineering Design, LLC. Storm Water Pollution Prevention Plan for Construction Activities Table 2 BMP Maintenance and Inspection Schedule (Runoff, Conveyance, and Treatment BMPs) The Development Company Anywhere, USA l3MP BMP Name Recommended Maintenance Recommended Designation Schedule of Maintenance 0200 Interceptor Inspect to insure structural integrity. Repair Weekly and following Dike & Swale as needed storms 0201 Grass -.Lined During growth period, inspect grass after Weekly and following Channels rainstorms. Remove accumulated sediments. storms Inspect outlets to prevent scouring and erosion. 0202 Riprap Inspect to ensure underlain soils are not Weekly and following Channel eroding. Inspect for slippage on SIOP s. storms Lining C204 Pipe Slope Check inlets for undercutting and outlets for Weekly and following Drains erosion after rainstorms. Inspect pipe for storms damage. Check pipe for clogging debris. C205 w Subsurface Check to ensure drains are not clogged with Monthly Brains sediment or plant roots. Prevent heavy track traffic from crushing piping. 0206 Level Spreader Check to ensure proper functioning after Weekly and following rainstorms. Prevent traffic from crossing the storms spreader. Repair if damaged. 0207 Check Dazes Remove sediment when one half Else sump Weekly and following € depot. Cheek for erosion around edges of storms dams. 0209 Outlet ; Inspect and repair as needed. Add rock as Weekly and following Protection needed. Clean energy dissipator if sediment storms builds up. 0220 Storm Drain Replace clogged filter fabric. Clean sediment Weekly and following Inlet [ from stone filters. Do not wash collected storms Protection sediments into storm drains — remove to soil € stockpile. 0230 Straw Bale [ Inspect daily during rainy periods. Check for Daily during prolonged Barrier [ undercutting, end runs, and damaged bales. rainy periods. Remove accumulated sediment when one half the harrier height. C231 Brush Barrier I Inspect daily during rainy periods_ Check for Weekly and following i undercutting, end runs, and damaged sections. storms u NRemove accumulated sediment. Pacific Engineering Design, LLC:. Stone Water Pollution Prevention Plan for Construction Activities BMP BMS' Name Recommended Maintenance Recommended Designation Schedule of Maintenance 0233 Silt Fence Repair damaged fencing immediately. Weekly and following intercept concentrated flows and reroute. stones Remove sediment accumulations at 6 -inches. Replace deteriorated fencing inateriai. Properly dispose of used fencing. 0234 Vegetated Re -seed damaged areas immediately. Install Weekly and following Strip sod to replace eroded vegetation. Reroute stories concentrated flows through vegetated strip 0240 Sediment Trap Remove sediment when it reaches a depth of Weekly and following one foot. Repair damage to trap storms embankments and slopes. 0241 Sediment fond Remove sedirnent when it reaches a depth of Weekly and folloing one foot. Repair damage to pond stories embankments and slopes. 0250 Storm water See Monitoring in Section I l As required Chemical Treatment Pacific Engineering Design, LLC. Storm Water Pollution Prevention Plan for Construction Activities Erosion and Sediment Control Inspection Form Erosion Prevention Inspector(s): Site Marne and Location: Date: Cuxrent Weather Conditions: Last 24 Hours: _w..... BNTP Desigktion OX ---- Not U.K.. BMP Condition. Corrective Action, General Notes Construction Access ------------- Trackout? Street Clean? ;.... _---------- ---- ... - --- Soil Stabilization ......-..._..-__:_..._.........----------------- - .-.._.-.. .------------------ ---------- -Si;ns Signsof Erosion: ! Gullies? i__------_ i Slope Failures'? ---_ Rills? i ••---•------- -- ---- Slope Protection Plastic Condition? Grass Growing?------- .Hydroseed Condition? --------------- - m.---- --- Matting'? Perimeter Control ---------.----............ _.. Clearing Limits Marked? ---------_-_-- ------_....-..-. Silt Fences? j Swales? - - --- --- — - j Conveyances Stable i Ditches? Check Check Darns Intact? --------------------- ----------------------- Sand Bags? Slope Drains? TESL Management � Revisions Required? ----- --- ----- - .-_.m.. _---.---- -----___-------____-- s------- ------- - -- _.......M.. ... u. ...... �.._.__._ Water ?Management ------.-.__..------_--_.. _._. __.. - Infiltration System? f lean and Dirty Water separated` �--- ---- --- - ' Offsite Water Bypassing? -- --Outlet Protection _..... m.__....... Pacific Engineering Design, LI..C. Ston -n Water Pollution Prevention Pian for Construction Activities Erosion and Sediment Control Inspection. Form Sediment Control SMF' Designation Storm water Detention And Monitoring BM.P Maintenance .._._....._.._.-._.....--... Inlet Protection ON . ................. Not o.K. _ _.------- ----------------------------------------------------------- I 13€V[.P Condition Corrective Action General Notes --- -- - --- - - ---- ----- - .._.................. __._._. ... _..__...._ ------------------ --- --------------------------- - _-- Dust Control Spill Prevention 1 F ------------------------- --------------------------------------------- -- - ------------------------------------------------- ondition of Uischarg Water Comments: --- ---- - .m.._..M....._.......... ------------------- Pacific Engineering Design, LLC. 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Ln co CC) nom, 4— L 0 a a t� a � rz u �, � r Z v a o • - © n a' nu ❑ La L2vi u r� ❑ tri 6W Q c ys h to rN r-4 v 10 as r.L W N l` to u � � O L _ 4-1 u ra L L L N a I y Q3 r71 4 N tJ i n > S v� c Ir•+�.... t!1 Q O Q r H u Ls C3 v3 U vQi r7 s�.T G ar m m rn L r v' N m 41 7 p {J1 Q. ': .: .... ..IZJ 0.i •Li] a -tz v QJ a a w n I ,o -0 ro LL air L CN7 v... ... nom, 4— � rz ❑ u r� ❑ tri 6W Q c ys h 3 — CL Fir C3 ij] 4=L p c ice-+ L ti tit- it C ,� - CC j ..... a v . 4� p s---' 4- cr u, ii � c zi t41 sn [€ Lu C to rN r-4 v 10 as F -- J E�. F -- €r 0 W 0 z 0 Z Q w w N C:y U) 2ND ORIFICE 4" ELBOW EL = 398.90 2ND OR3i10E DIA. = 1.00" ................ ....... , I CB P (TYPE 0 I i "j ---CONNECT -c EXI5T1r0: DITem ICB 01 (-YP'E :) --- TRACT 8 ' STURIr TY-+' o LOT 6; COMBINED DETENTION I WET VAULT SEE NOTE AT :.EFT / � ..�.. .. • .: '. .� ........ ..... .. % '._._ •E)CST•NG TREE 1'O REMAIN "-1'P .i... ..�. �... 5 .4a- y1.17• ICON' ECH CDS 2015-4 OR � � � �. ArFROVER c:4UIVAI,:,N7- - _.f. FOR PRE- ME'ATME1+7 ;�Ez j E 'I ^lDTE AT Riff 'OR A R r F ; ; ... _ _ a $F i� - f LOT 3 rraT z I NEW 8"� $ J7':.-s4"'1ti 293-7F i '�. ...... ... .... / ..�-�.-~ 0 iP 21) 40 ... ... ... Qsp a 'm 'm .... ... .... ... ....... .. , .....� .... 1/{ ; G9. X72 (TYPE 3} � \ I � C$ #i4 (TYPE [} i Q Y I —' q _--• ; 1 GRAPHIC SCALE 12� PR[VATE STORM - €�_. ."".{ i [7RA3NAC•E EA5 TORR' i SCALE. F -2(Y 5 0RMIECH M.s 3500 ..•--�^ 4F2J - - - _�.............. . f S _ i.............._.-...•., _. CLEAN. CRUSHED. ANGULAR, STONE SEfl ^,.'ZE ---- I I I. new• - OD #15 (TYPE E) ; f L77.5'L X 22.-75-W X 5.5'H] Wf "OTAL 39 04AMBERS, '"`1""" '� '•' '"" "" "' '"'.. '"" T ��� 6 END CAPS_ 3 ROWS - ONE ESOLAWN ROW, TWO iNF[LTRATfON CtiA€d$ERS. ' -- - �. --- - --- - - - �. - - --- - - - , •I w SEE SHEET PDfi, P07 FOR DETAILS + i C9 1l ;711'E GRADE OF ACCESS R.7AD`, I ..Ij ai Lai 5 1 # ------------- ------i i' $`,'STEM OVERFLOW - 412.75 '.s1C �F a t - TOTAE. LYE STO:4A.^,E REc]U1- D 4,966 CF I i g TOTN, LVE STORAGE PROVIDED -- r C iZ, sAWCEiT EDC- ASPHALT PAVEhfE1iT (TYP) J� I s.asc I,; s.o1s sF LC1i''t p .21 LF INFILTRATION �,•�� '� I !� I ... .............. . jj f SF �' 3 {' I $.a a Ss N ll ] Tit #Zz SEE DELA€U n ..=:r I I- ! - SHEET 495 } £ . I ` .. .- -: ..c .. l _ EE N0� st+ES SHEET F ] {SH' ""YP, r1'�: t ''•,r € T ,I-�IHFItiFiA7EDT15Y&TEkN _CB . 6 '.•YP ' s � •i S' :t I - S iL ` s �•: ` 1 6 3 (TYPE iE}• j .I 9 -16 (#1 ([I} E ) A1C ••C I R 7ETYP � . 3 Mme• r } � I ' T I e i N 4 tip.. ..... .. , .... - �„t . .,.. _ .... � .. _... _ ---5�.,.. _ .. S7'A O+�41:.(IJE:2.ti0 SSREET).._ .(� .... :...`.:.... .... ... ..... ...ca =STA S+OO rH08'J1AM AYE Nf:) . t S .. .. € 9LD7acn wzzas2• [ExISE•reG 4Y3 {TYPE E} 3 } ..._.._ .w........_ - i--- _....._...i LEGEND PROPOSED 1 A7URES �f r EX{S"M'3 f A71A9E5 ,5p PROPOSED STORM DRAh P{PE � ... ............... .. .. .............. .. ... ................ .. ... ... ... .... ..F I \ PROPOSPD SEWE_'R MAIN COMBINED DETENTION t WET VAULT ...... .....:::-..... ....... ..:,:�� :: :::...:::- ...<,., ._---iY [441 x 2rwj : = ..... .....::....... ........ . , :.:.: ��.. ...:.. SEE SHEET P05 FOR DETAILS PPOPOSED LOT.._... GUrrER, FLOW, & CURS LINE 100 YEAR DNT ON NATER SURFACE E-1,= .64.51) A Ij'[ -,DP WR EL_ ............. :::.': :: .'i : __.... - --- B47T4h{ WQ 393-50 EASEMEN't LyNE REOUiRED DETENnM LIVE STORAGE. = 4,660 OF CJJRB RAMP _ ._ w. - - . -- 813 ar'NC SETBAaK LINE (B$R) DETEN'RO VE STORAGE = 4,752 CIF PROL4D£D Ni L{ i;.._..._.__ PROPOSEV ASPHACF PAVE4ENr REQU€RED WQ DEAD STORAGE: tt 2,055 A u 4752 P GVDED raDEAD STORACE -.:...... .. 2' EXlST1NG C'ONTDURS ., :.. INV. 6' (SE, LE} = 34Fi.50 f ---a o — — fp' PROPOSED CONTOURS INV, (12" SE) - 39&00 E ni'l... 12" FLOW CONTROL R€SER OVERFLOW EL- n 401,:x7 I "� INV. 1,2" CUT ($W) - 397-50 BOTTOM 0MFICE EL = 395.50 TR7A1 ORT1 CE D'A - 0 75 0 4'} 2ND ORIFICE 4" ELBOW EL = 398.90 2ND OR3i10E DIA. = 1.00" ................ ....... , I CB P (TYPE 0 I i "j ---CONNECT -c EXI5T1r0: DITem ICB 01 (-YP'E :) --- TRACT 8 ' STURIr TY-+' o LOT 6; COMBINED DETENTION I WET VAULT SEE NOTE AT :.EFT / � ..�.. .. • .: '. .� ........ ..... .. % '._._ •E)CST•NG TREE 1'O REMAIN "-1'P .i... ..�. �... 5 .4a- y1.17• ICON' ECH CDS 2015-4 OR � � � �. ArFROVER c:4UIVAI,:,N7- - _.f. FOR PRE- ME'ATME1+7 ;�Ez j E 'I ^lDTE AT Riff 'OR A R r F ; ; ... _ _ a $F i� - f LOT 3 rraT z I NEW 8"� $ J7':.-s4"'1ti 293-7F i '�. ...... ... .... / ..�-�.-~ 0 iP 21) 40 ... ... ... Qsp a 'm 'm .... ... .... ... ....... .. , .....� .... 1/{ ; G9. X72 (TYPE 3} � \ I � C$ #i4 (TYPE [} i Q Y I —' q _--• ; 1 GRAPHIC SCALE 12� PR[VATE STORM - €�_. ."".{ i [7RA3NAC•E EA5 TORR' i SCALE. F -2(Y 5 0RMIECH M.s 3500 ..•--�^ 4F2J - - - _�.............. . f S _ i.............._.-...•., _. CLEAN. CRUSHED. ANGULAR, STONE SEfl ^,.'ZE ---- I I I. new• - OD #15 (TYPE E) ; f L77.5'L X 22.-75-W X 5.5'H] Wf "OTAL 39 04AMBERS, '"`1""" '� '•' '"" "" "' '"'.. '"" T ��� 6 END CAPS_ 3 ROWS - ONE ESOLAWN ROW, TWO iNF[LTRATfON CtiA€d$ERS. ' -- - �. --- - --- - - - �. - - --- - - - , •I w SEE SHEET PDfi, P07 FOR DETAILS + i C9 1l ;711'E GRADE OF ACCESS R.7AD`, I ..Ij ai Lai 5 1 # ------------- ------i i' $`,'STEM OVERFLOW - 412.75 '.s1C �F a t - TOTAE. LYE STO:4A.^,E REc]U1- D 4,966 CF I i g TOTN, LVE STORAGE PROVIDED -- r C iZ, sAWCEiT EDC- ASPHALT PAVEhfE1iT (TYP) J� I s.asc I,; s.o1s sF LC1i''t p .21 LF INFILTRATION �,•�� '� I !� I ... .............. . jj f SF �' 3 {' I $.a a Ss N ll ] Tit #Zz SEE DELA€U n ..=:r I I- ! - SHEET 495 } £ . I ` .. .- -: ..c .. l _ EE N0� st+ES SHEET F ] {SH' ""YP, r1'�: t ''•,r € T ,I-�IHFItiFiA7EDT15Y&TEkN _CB . 6 '.•YP ' s � •i S' :t I - S iL ` s �•: ` 1 6 3 (TYPE iE}• j .I 9 -16 (#1 ([I} E ) A1C ••C I R 7ETYP � . 3 Mme• r } � I ' T I e i N 4 tip.. ..... .. , .... - �„t . .,.. _ .... � .. _... _ ---5�.,.. _ .. S7'A O+�41:.(IJE:2.ti0 SSREET).._ .(� .... :...`.:.... .... ... ..... ...ca =STA S+OO rH08'J1AM AYE Nf:) . t S .. .. € 9LD7acn wzzas2• [ExISE•reG 4Y3 {TYPE E} 3 } ..._.._ .w........_ - i--- _....._...i LEGEND PROPOSED 1 A7URES EX{S"M'3 f A71A9E5 ,5p PROPOSED STORM DRAh P{PE 80l;r1pRRY R, 0, W - UNE..... ..... :"....... "�:�,.�,.. •.... - - 55-------------- PROPOSPD SEWE_'R MAIN .....—......_— CCNI£RLiNE ...... .....:::-..... ....... ..:,:�� :: :::...:::- ...<,., ._---iY PRD" CSFP WA TTR MAW LO?' LINE ..... .....::....... ........ . , :.:.: ��.. ...:.. LOT PPOPOSED LOT.._... GUrrER, FLOW, & CURS LINE - .-. ....'.. ...'.. _. .... ...... ... _ PROPOSED SAWG>;f3 L?tit ............. :::.': :: .'i : __.... - --- PROPOSEDD{2?PL7NE EASEMEN't LyNE CJJRB RAMP _ ._ w. - - . -- 813 ar'NC SETBAaK LINE (B$R) .. ... ... ........ .... '. ! .. .. . i;.._..._.__ PROPOSEV ASPHACF PAVE4ENr E[S1pCDNL 7OURS .. . `--- -.:...... .. 2' EXlST1NG C'ONTDURS ., :.. .....---- € .• ------ PROPOSED SJOEWALEf ---a o — — fp' PROPOSED CONTOURS ....... :.:........: 11a --- -- --,�' PROPOSED R7,Y fT7fiRS ... ..> .... ... .... .... ..................... ............_. - ... - M � r:;:: -P����.7� �,i� rji..r1 w � _r.?_� � `$ �.. ry iwLsFrl so 1 •�zn, ,.�•,.'��, CIT Y �> REN TON _ pr J�a1 3 r 1jS ... ..... Civil Srl it mar: r,J Z-1 ; J. FFNG DATJU - �7ais.i• P?vnnirg/Bu?Iding/Pohl, Worts Dept.t.` planning Gauss+!?.a:r-_> i ]�I1(IS YO. REV€5IDN By DA'1'F. APPR J. FENU �z Iw IN COMPLIANCE IVITH CITY OF RENTON STANDARDS x 0 rn 0 z Q GREEN'S LANDINCA SHORT "T %li-2D1s � w PRELIMINARY GRADING AND DRAINAGE PLAN p..� w E1W P02P4s (j X. Operations and Maintenance Manua The onsite storm facilities will be maintained by the property owner and manager. 74 APP.r:NDIX A MAINTENANCE REQUIREMENTS FOR STQRMWATER FACILITIES AND ON-SITE, BIN7PS ............. .............. ND. 2- INILTRAT[DNrA MAINTENANCE DEFECT OR CONDITIONS WHEN RESULTS EXPECTED WHEN COMPONENT PROBLEM MAINTENANCE IS NEEDED MAINTENANCE IS PERFORMED lnlet/Ouflet Pipes Sediment 1! Sediment filling 20% or more of the pipe. Inlet/outlet pipes clear of sediment, accumulation i Trash and debris Trash and debris accumulated in No trash or debris In pipes- ; inletloutfet pipes {includes i?oatables and '• non-itaatabEes;- Damaged inletiout€et Cracks wider than'/ -inch at the joint of the No cracks more than %-inch wide at the pipe i inietloutfet pipes or any evidence of soil joint of the inletloutlet pipe. entering at the ioints of the inlet/outlet pipes. Access Manhole ? Cover: fid not in place I Cover/lid is missing or only partially in Manhole access covered. i place. Any open manhole requires 1 immediate maintenance. • Locking mechanism 1 Mechanism cannot be opened by one Mechanism opens with proper tools. not working i maintenance person with proper tools. Batts cannot be seated. Self-locking 1 cover/lid does not work. Cover/lid difficult to One maintenance person cannot remove coverllid can be removed and reinstalled remove ? coverllid after applying 80 lbs of lift. by one maintenance person. uµW Ladder rungs unsafe Missing rungs, misalignment, rust, or W Ladder meets design standards. Allows cracks. maintenance person safe access. Large access Damaged or difficult i Large access doors or plates cannot be Replace or repair access door so it can doors/plate i to open I opened1removed lasing normal equipment. opened as designed. Gaps, doesn't cover i Large access doors not Tial andlor access Doors close flat; covers access opening completely I opening not completely covered. completely. [ Lifting rings missing, Lifting rings not Capable of lifting weight of Lifting rings su€ficient to lift or remove rusied door or plate. door of plate, Infiltration Pond; €Plugged fitter bag (if I Filter bag more than 112 full. Replace fifter bag or redesign system. Tank, Vault, Trench, ! applicable) € or Small Basin Filter s Bags W V Infiltration hand, 5edimeni 6" or more of sedirnerri has accumulated. Pry: -settling oocurs as designed "yank, Vault, Trench, accumulation i or Small Basin Pre- € settling Ponds and l Vaults f Infiltration Pond, Plugged rock filter High water level on upstream side of `filter Rock fflter replaced evaluate need forfilter Rock Filter rennins for extended period of time or little and remove if not necessary. or no water flows through filter during i heavy rain storms. ............_..._ w....... ---....V. .... ._...m_.._ m. _ In €ltration Pond [ Rock missing i Only one layer of rock exists above native Spillway restoTed to design standards. Emergency sail in area ave square feet or larger, or i Overflow Spillway 1 any exposure of native soil at the top of i 1 out flow path of spit€way. Rip -rap on inside slopes need not be replaced. Tree: growth "free growth impedes flow or threatens l Frees removed. stability of spillway. 2017 City of'Renton Sjr£ace Water Design Manual 1.2!I2i2016 A -S APPENDIX A MAINTENANCE RI:Q[J1REMEN1 T'S FOR S` OR:MWAT'ER FACILITIES AND ON-SITE £3MPS NU TI TA KS `AN © VAULTS C3N N MAINTENANCE ` DEFECT OR CONDITIONS WHEN RESULTS EXPECTED WHEN COMPONENT PROBLEM MAINTENANCE IS NEEDED MAINTENANCE IS PERFORMED Site € Trash and debris Any trash and debris which exceed 1 cubic Trash and debris cleared from site. foot per 11,000 square feet {this is about equal to the amount of trash it would take to fill up one standard size office garbage i can}. In general, there should be no visual evidence of dumping. Noxious Weeds Any noxious or nuisance vegetation which Noxious and nuisance vegetation removed may constitute a hazard to City personnel according to applicable regulations. No or the public. danger of noxious vegetation where City personnel or the public might normally be. Contaminants arid Any evidence of contaminants or pollution Materials removed and disposed of pollution i such as oil, gasoline, concrete slurries or according to applicable regulations. Source paint. ' control BMPs implemented if appropriate. No contaminants present other than a surface oil film. Excessive growth of Grass or grvundcover exceeds 18 inches Grass or groundrover mowed to a height grassfgroundcaver m height, no greater than 6 inches. _. ........ ___.-------- - Tank or Vault Trash and debris _........_.. _ Any trash and debris accumulated in vault No trash or debris in vault. Storage Area i or tank {includes ffoatables and non- ] ' floalab€es}. Sediment •. Accumulated sediment depth exceeds All sediment removod from storage area. accumulation i 16% of the diameter of the storage area for €ength of storage vault or any point depth exceeds 15% of diameter. Example., 72 -inch storage lank would require r1eaning when sediment reaches depth of 7 inches t'or more than Y. length of tank. Tank Structure i Plugged air vent 1 Any blockage of the vent. Tank or vault freely vents. Tank bent out of ................................_---.. -- Any part of tankipipe is bent out of shape ------............ repaired or replaced to design. 1 shape more than 10% of its design shape. (yank 1 Gaps between i A gap wider than '/,-inch at the ioint of any No water or soil entering tank through sections, damaged € tank sections or any evidence of sol€ 1 faints or waIis, joints or cracks or s particles entering the tank at a joint or 1 tears in wall through a wall, Vwult Structure Damage to wall, i Cracks wider than '''-inch, any evidence of . Vault is sealed and structural€y sound. frame, bottom, andlor i soil entering the structure 91rough cracks top slab or qualified inspection personnel determines that the vault is not structurally sound. inlet/outlet Pipes Sediment ; Sediment fil€ing 20% or more of the pipe. In€etJa �l€et pipes clear of sediment. accumulation Trash and debris ; Trash and debris accumulated in No trash or debris in pipes. inlet/outlet pipes 4includes fioatables and non-iioatables}. Damaged in€eifoutlet Cracks wider than'' -inch at the joint of the ': No cracks more than %-inch wide at the pipes inleiloudet pipes or any evidence of soil ;•. joint of the inletloutlet pipe. entering at the joints of the inletfoutlet pipes. _._..._ .._ ' i.._.—...._. --- _.... .. .� Access Manhole Coverlfid not in place Coverilid is missing or only partially in Manhole access covered. place. Any open manhole requires immediate maintenance. 12/12/2016 2017 City of Renton Surface Water Design Manual A-6 APPENDIX MA1N'TrFNANCF.% REQUIREMENTS FORSTORNIWATER FACILITIES AND ON-SITE BIVIPS NO. 3: DETENTION. TANKS AND VAPLTS MAINTENANCE I DEFECT OR CONDITIONS WHEN RESULTS EXPECTED WHEN COMPONENT PROBLEM MAINTENANCE IS NEEDED MAINTENANCE IS PERFORMED Access Manhole Locking mechanism Mechanism cannot be opened by one Mechanism opens with proper tools. not working maintenance person with proper tools, Bolts cannot be seated. Self-locking coverflid does not work. J Cover:Md difficult to One maintenance person cannot remove Cover1lid can be removed and reinstalled remove cover/lid after applying 80 lbs of lift. by one maintenance person. Ladder rungs unsafe Missing rungs, M=SajignrnCnt, rust, Or Ladder rneets design standards- Allows maintenance person safe access. Large access Damaged or d iffiffi cult Large access doors or plates cannot be Replace or repair access door so it can doors/plate to open opened/removed using normal equipment- opened as designed. Gaps, doesn't cover Large access doom not flat andlo r access Doors close flat: covers access opening completely opening riot completely covered. compmely- .......... Lifting rings missing, Lifting rings not capable of lifting weight of Lifting rings suff fcient to lift or remove door rusted door Or plate. or plate - 2.01.7 City of Renton Surface Water Design Manual 12/12/2016 A-7 APPENDIX A MA1N1 'n_-,NANC_E REQUIREMENTS FOR STORM.WATER FACILI-IIES ANIS ON -SI IT P3MPS NO. 4 -- CDNTROL STRv CTUREIFLOW RES TDR MAINTENANCE DEFECTOR j CONDITION WHEN MAINTENANCE RESULTS EXPECTED WHEN COMPONENT --___LK -- — PROBLEM tl E[DEf3 MAINTENANCE IS PERFORMED — - ------------- Structure Trash and debris j 'Fresh. or debris of more `than'/ cubic foot No Trash or debris blocking or potentially which is located immediately in front of the 1 blocking entrance to structure. i€ 1 structure open€ng or is blocking capacity of 1 the structure by more than 10%, l Trash: or debris in the structure that € No trash or debris in the st ucture. exceeds '1- the depth from the bottom of basin to invert the lowest pipe into or out of 0) basin. Deposits of garbage exceeding 1 cubic ` No condition present which would attract or the breeding insects foot in volume, support of or rodents. Sediment ;wSed'€merit exceeds 60% of the depth from Sump of structure contains no sediment. accumulation the bottom of the structure to the invert of I the lowest pipe into or out of the structure ] or the bottom of the FROP_ T section or is j within 6 inches of the invert of the lowest pipe into, or out of the structure or the botto€n of the F ROP -T section. ' Damage to frame Corner of frame extends more than % inch Frame is even with curb. and/or top slab past curb face into the street (if j applicable)_ _. I Top slab has holes larger than 2 square rop slab is free of holes and cracks, inches or cracks wider than ''% inch. Frame not sitting flush on top slab, Le_ Frame is sitting flush an top slab - separation of more than'/4 inch of the frame from the top slab- Cracks in walls or Cranks wider than % inch and longer than Structure is sealed and structurally sound. bottom 3 feet, any evidence of soil particles entering Structure through cracks, or maintenance person judges that structure is unsound. Cracks wider than `/ inch and longer than No cracks more than '14 inch wide at the 1 foot at the joins of any iriletfoutlet pipe a joint of inletloutlet pipe. any evidence of soil particles entering structure through cracks. Settlement/ Structure has settled more than 1 inch or ~~W Basin replaced or repaired to design misalignment ties rotated more than 2 inches out of standards - alignment, .................................µ.µ.....w...... _... .......................__.. Darnaged pipe joints .._..�.............._... Cracks wider than '/=••inch at the jolnt of the No cracks rnore than'/ -inch wide at the inlet outlet pipes or any evidence of soil joint of inlet/outlet pipes. entedng the structure at the joint of the inlet/outlet pipes. Contaminants and Any evidence of contaminants or pollution klater a€s removed and disposed of pollution such as oil, gasoline, concrete slurries or according to applicable regulations- Source paint, control BMPs implemented if appropriate. No contaminants present other than a w ...... ._____ surface oil fiimn Ladder rungs missing Ladder is unsafe due to missing rungs, i Ladder meets design standards and allows [ or unsafe f misalignment, rust, cracks, or sharp edges. maintenance person safe access- FROP-T Section Damaged FROP 1' T section is not securely attached to T section securely attached to wall and : structure wM and outlet pipe structure outlet pipe. should support at !east 1,000 lbs of up or down pressure. Structure is not in upright position [allow up :Structure in correct position. _......._____ ]-- .__....._.i._rm..m_ to 10% from plumb)- I2.'I212016 2017 City of Renton Surface Water Design Manual A -S APPI NDIX A v1AIN'FI:NANC: .RE.Q1;fI7.EMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS C R TURE1FLOlF1�`RESTR Q !'STR[7CET 1 MAINTENANCE i DEFECT OR N CONDITION WHEN MAINTENANCE � RESULTS EXPECTED WHEN COMPONENT PROBLEM IS NEEDED ! MAINTENANCE IS PERFORMED _m...�............. .... .. - - M.... -. _._ ...w. FROP-T Section Damaged FROP-T ' Connections to nutlet pipe are not Connections to outlet pipe are water tight: (coni.) (cont.) wate�ight or show signs of deteriorated structure repaired or replaced and works ? grout- as designed - i Any holes --- other than designed holes ---in Structure has no holes other than designed i the structure. holes. Cleanout Cate Damaged or missing Cleanout gate is missing. Replace cleanout gate. cleanout gale ...____... _ Cleanout gale is not watertight. Gate is watertight and works as designed - Gate cannot he moved up and down by Gale moves up and down easily and is one maintenance person. watertight. Chainlrod leading to gate is missing or Chain is in place and works as designed. damaged - Orifice Plateal W ~Damaged or missing Control device is not working properly due ._ Plate is in place and works as designed - Orifice plate to missing, out of place, or bent orifice plate. Obstructions to orifice Any trash, debris, sediment, or vegetation P€ate is free of all obstructions and works plate blocking the plate. as designed. Overfiaw Pipe _._._.._... ---- Obstructions to -------- -- ----- Any trash or debris blocking (or having the - ... _- Pipe is free of all obstructions and works overflow pipe potential of blocking) the overflow pipe. as designed. Deformed or pip of over€iow pipe is bent or deformed. Overflow pipe does not allow overflow at damaged lip of an elevation lower than design overflow pipe ]nlet/Oullet Pipe Sediment Sediment tilling 20% or more of the pipe. lnletfoutlet pipes clear of sediment. i accumulation 1 Trash and debris Trash and debris accumulated in No trash or debris in pipes. inietloutlet pipes (includes floatables and ] part-ftcafables}- ------------- Damaged inlet/outlet Cracks wider than In ch at the joint of the No cracks more than %-inch wide at the pipe inleVoutlet pipes or any evidence of soil joint of the inletloutlet pipe. entering at the joints of the inletloutlet pipes. lMetal Grates € Unsafe grate opening L---- Grate with opening w€der than '18 inch. Grate opening meets design standards. (if applicable) ....._..._.�._ Trash and debris w Trash and debris that is blocking more Grate free of Trash and debris. footnote: to l than 20% of grate surface. guidelines for disposal ^^ - Damaged or missing Grate missing or broken member(s) of the - Grate is in place and meets design grate grate. standards. Manhole Cover/Lid mm Coverllid not in place Coverllid is missing or only partially in Cover/lid protects opening to structure. place. Any open structure requires urgent maintenance. Looking mechanism Mechanism cannot be opened by one "Mechanism opens with proper tools. no€ working maintenance person with proper tools. Bolts cannot be seated. Self-locking coverll€d does not work. Coverllid difficult to One maintenance person cannot remove Coverllid can be removed and reinstalled remove cover/IA after applying 80 lbs. of lift. by one maintenance person. 2017 City of menton Surface Wa:tr Dc sign Manual 12/12/2016 A-9 API'ENWX A MAENTENA-KCE REQUIREN4ENTS FOR STORMWATI-R. FACILITIES AND ON-SITE BMPS .r,6. :CATCH BASINS AND MANHOLES ... . ..... .. . .. . . .............. MAINTENANCE DEFECT OR CONDITION WHEN MAINTENANCE RESULTS EXPECTED WHEN COMPONENT PROBLEM IS NEEDED MAINTENANCE IS PERFORMED Structure Sediment i Sediment exceeds 60% of the depth from Sump of catch basin contains no sediment. accumulation the bottom of the catch basin to the invert of the lowest pipe into or out of the catch basin or is within 6 inches of the invert of the lowest pipe into or out of the catch basin. ------ Trash and debris - - ------ - - Trash or debris of more than'/ cubic foot No Trash or debris blocking or potentially which is located immediately in front of the blocking entrance to catch basin. catch basin opening or is blocking capacity of the catch basin by more than 10%, 1 Trash r debris in the catch basin that No trash or debris in the catch basin - exceeds 9-, the depth from the bottorn of basin to invert the lowest pipe into or out of the basin- ......... . -- ....... — ----- I Dead animals or vegetation that could No dead animals or vegetation present generate odors that could cause within catch basin - complaints or dangerous gases (e -q_ methane}. Deposits of garbage exceeding 1 cubic No condition present wh Ich would attract or foot in volurne- support the breeding of insects or rodents - Damage to frame Comer of frame exte nds more than inch Frame is even with curb. a ndfor top slab past curb fare into the street (If applicable). Top slab has holes larger than 2 square I Top slab is free of holes and cracks - inches or cracks wider than'/ inch- ...... .... .. — ......._m._- Frame not sitting flush or) top slab, i -e.-, . ........ Frame is sitting flush on top slab - separation of more than /, inch of the frame from the top slab.- ------ Cracks in walls or Cracks wider than % Inch and I onger than Catch basin is sealed and is structurally bottom 3 feet, any evidence of soil particles sound. entering catch basin through cracks, or maintenance person judges that catch basin is unsound- nsound- Crarks wider than 16 Inch and longer than Cracks No cracks more than '14 inch wide at the 1 foot at the joint of any inlet/outlet pipe or joint of in[etfoutlet pipe. any evidence of soil particles entering catch basin through cracks. Settlement' Catch basin has settled more than I inch Basin replaced or repaired to design misalignment or has rotated more than 2 inches out of standards. alignment, Damaged pipe joints 1 Cracks wider than Yinch at the joint of the No cracks more th an '/- i nc h wide at the i inleVoutlet pipet, or any evidence of soil joint of inlet)otAel pipe& entering the catch basin at the joint of the inletfoutlet pipes. Contaminants and Any evidence of contaminants or pollution Materials removed and disposed of pollution such as oil, gasoline, concrete slurries or according to applicable regulations- Source paint control 3MPs implemented if appropriate - 11 con' ta m i n a nts present othe r than a surface oil film, InIptiOutlet Pipe Sediment Sediment filling 20% or more of the pipe- lnleVoutiet pipes clear of sediment - Trash and debris Trash and debris accumulated in No trash or debris in pipes- inletfoutlet pipes (includes floatables and non-floatables). 12/12/2016 2017 City of Renton Surface Water Design Manual A-10 A.PPE.-.NDIX A MAINTENAINCE> REQUIR.FMENTS FOR STORMWATER FACILITIES AND ON-SUFF E3_VIPS N[): 5;� CATCH BAST 5 :'.:;::` `'` MAINTENANCE DEFECT OR CONDITION WHEN MAINTENANCE RESULTS EXPECTED WHEN COMPONENT € PROBLEM ? IS NEEDED^„^ MAINTENANCE IS PERFORMED Inlet/Outlet Pipe m Damaged inlefloutlet Cracks wider than %-inch at the joint of the No cracks more than X. -inch wide at the (Pont.) pipe inleflouUet pipes or any evidence of soil joint of the inietloutlet pips:, j entering at the joints of the inlet/outlet pipes. ......................._. Metal Grates Unsafe grate opening Grate with opening wider than 71a inch. Grate opening meets design standards. Latch Basins j Trash and debris Trash and debris that is blocking more Grate free of trash and debris. footnote to than 20% of grate surface. guidelines for disposal Damaged or missing Grate missing or broken member(s) of the Grate is in place and meets design grate grate. Any open structure requires standards. urgent maintenance. Manhole Coverllid Coverllid not in place t Coverllid is missing or only partially in Coverllid protects opening to structure. place. Any open structure requires urgent maintenance. Locking mechanism 1 Mechanism cannot be opened by one Mechanism opens with proper tools. not working maintenance person with proper tools. Bo Its cannot be seated. Self-locking coverflid does not work. Coverllid difficult to One maintenance person cannot remove Coverllid ran be removed and reinstalled remove coverflid after applying 80 lbs. of lift, by one maintenance person_ 2017 City of Renton Surface Water Dosign Mamial 12/12/2016 A -I I APPENDIX A MAINTENANIC:E REQUIREMENTS FOR STORMWr1 CER FACILITIES AND ON-SITE BMPS ----------------- CONVEYANCE PIPES AND DIT H S MAINTENANCE _ DEFECT OR ._ CONDITIONS WHEN RESULTS EXPECTED WHEN COMPONENT PROBLEM MAINTENANCE IS NEEDED MAINTENANCE IS PERFORMED pipes Sediment & deb is Accumulated sediment or debris that Water flaws freely through pipes. accumulation exceeds 20% of the diameter of the pipe. Vegetation/root Vegetation.,roots that reduce free 1 Water flows freely through pipes. growth in pipe movement of water through pipes- i Contaminants and Any evidence of contaminants or pollution wµ......_µ.__ 1: Materials removed and disposed of pollution such as oil, gasoline, concrete slurries or according to applicable regulations. Source paint. control 9MPs Implemented if appropriafe. § No contaminants present other than a ? surface nil filth. Damage to protective Protective coating is damaged- rust or i Pipe repaired or replaced, coating or corrosion corrosion is weakening the structural integrity of any part of pipe. Damaged pipes Any dent that decreases the cross section Pipe repaired or replaced - area of pipe by more than 20% or is jjj determined to have weakened structural integrity of the pipe. Ditches Trash and debris ; trash and debris exceeds 1 cubic foot per Trash and debris cleared from ditches - 1,006 square feet of ditch and slopes. Sediment ............. ......_ Accumulated sediment that exceeds 20% €]Itch cleaned/fl ushed of all sediment and accumulation of the design depth, debris so that it matches design. NOxi0tJ5 weeds 's Any noxious or nuisance vegetation which Nox-tous and nuisance vegetation removed may constitute a hazard to City personnel according to applicable reg€alat:ons. No or the public- danger of noxious vegetation where City personnel or the pubic might normally be - Contaminants and Any evidence of contaminants or pollution Materials removed and disposed of pollution i such as oil, gasoline, concrete slurries or according to applicable regulations. Source paint- control WPs Implemented if appropriate. No contaminants present other than a surface vii filrr�. I .............._._._ . _ _w _............ ..µ.____m. Excessive vegetation growth Vegetation Haat reduces free rnavernent of water through ditches. Water flows freely through dttahes, Erosion damage to Any erosion observed an a ditch slope. Slopes are not eroding. slopes .. .............. Rock lining out of .._w.u............m......................_ One layer or less of rock exists above ...M..µ..M........�. Replace rocks to design standards - i place or missing (If native soil area 5 square feet or more, any applicable) l exposed native $oil - 12/12/7016 2017 City of Rtmton Surface Water Design -Manual A-12 APPFNDI X A M.AIN'I'EN.9NCE TL1 Q. ,'IRFMI 'v"1'S rOR STORM- A'I'ER FAC::I1..I1 [F,,S AND ON-SITE BMPS RBAR R�E $: `,GATE51BaLi�AI]SIACGES$R .... MAINTENANCE DEFECT OR CONDITIONS WHEN RESULTS EXPECTED WHEN COMPONENT `: PROBLEM MAINTENANCE IS NEEDED MAINTENANCE IS PERFORMED Chain Link Fencing Damaged or missing Missing gate- I Gates in place. Gatemembers - _.-._..__ _.w............._._._...._.__r_-- Broken or missing hinges soots ltsat gate Hinges intact and tubed- Gate is working cannot be easily opened and closed by a freely. I maintenancep erson. I Gate is out of plumb more than 6 inches Gate is aligned and vertical - and more than I foot out of design i alignment- ; Missing stretcher tsar, stretcher bands, and i Stretcher Year, hands, and Fids in place. ? ties. 1 Locking mechanism Locking device missing, no -functioning or Locking mechanism prevents opening of does not lock gate does not link to all parts- gate- € Openings in fabric i Openings in Fabric are such that an &inch Fabric mesh openings within 50% of grid diameter ball could ft thro€sgh. � size. Bar Gate Damaged or missing [ Cross bar does riot swing open or closed, € Gross bar swings fully open and closed crass bar S i5 €ik15SEng or IS bent to where It does not i and prevents vehicle access. i prevent vehicle access. Looking mechanism Locking device missing, no -functioning or i Locking mechanisms prevents opening of does not lock gate € does not link to all pails, gale. Support post Support post does not hold cross bar up. Gross bar held up preventing vehicle damaged access into facility. µ Bollards Damaged or missing Bollard broken, missing, does not fit into i No access for motor€zed vehicles to get bollards € support hole or hinge broken or missing- into facility. Bollards do not lock € Lacking assembly or lock missing or No access for motorized vehicles to get cannot be attached to lock bollard in place. into facility. Boulders Dislodged boulders ; Boulders not located to prevent motorized € Na access for motorized vehicles to get ? vehicle access, into facility. Evidence of vehicles Motorized vehicles going around or ? No access for motorized vehicles to get circumventing between boulders- into facility- bouldem 12/12/2016 2417 City of'Remon Surface Water Design Manual .A,-1 6 A1't'EsNDIX A MAINTENANCE REC UIR.I.MEiNTS FOR STORMWATER FACILITIES ANIS ON-SITE BMI'S 7777777 7. CAPING).'` ;', ` GRDDNDS ([: NDS, 4 MAINTENANCE DEFECT OR CONDITIONS WHEN RESULTS EXPECTED WHEN COMPONENT PROBLEM MAINTENANCE IS NEEDED MAINTENANCE IS PERFORMED Site Trash and debris Any trash and debris which exceed 1 cubic 'Trash and debris cleared from site. foot per 1,000 square feet (this is about equal to the amount of trash it would take to fil! up one standard sire office garbage can). In general, there should be no visual evidence of dumping. Noxious and nuisance vegetation removed Noxious weeds Any noxious or nuisance vegetation which may constitute a hazard to City personnel ( according to applicable regulations. No or the public. danger of noxious vegetation where City personnel or the public might normally be. Contaminants and Any evidence of contaminants or pollution Materials removed and disposed of pollution such as oil, gasoline, concrete: slurries or according to applicable regulations. Source paint. j contras BMPs implemented if appropriate. No contaminants present other than a surface oil film. w ......._._ _ __ w...�........_---__ w._._. _.µ... Exressive growth of Grass or groundcover exceeds 18 inches Grass or groundcover mowed to a height grassfgroundcover In height, no greater than B inches. Trees and Shrubs Hazard tree identified Any tree or limb of a tree identified asi do hazard trees in facility. having a potential to fall and rause i property darrsage or threaten human life. A hazard tree identified by a qualified i arborist must be removed as soon as possible. i ©amaged 3ree or ? imbs or }saris of trees or shrubs that are Trees and shrubs with less than: 5% of total [ shrub identified split or broken which affect more than 25% foliage with splst or broken limbs, of the total foliage of the tree or shrub. .._._.._...V.µ.__µ _�.. i 'frees or shrubs that have been blown No blown dawn vegetation or knocked over ( down or knocked over. vegetation. Trees or shrubs free of injury. = Trees or shrubs which are not adequately Tree or shrub in place and adequately € supported or are leaning over, causing supported; dead or diseased trees i exposure of the roots- removed. 2017 Cil -v of Renton Surface Water Design Manual 12/12/2016 A-17 APPENDIX A iW NINTFNANCE REQUIREMENTS FOR STORMC','ATER FACILITIES ANIS ON-SITE. BMPS NUJ: '12'x: ACCESS RC3A .. .. [ _ MAINTENANCE 1 DEFECT OR CONDITION WHEN MAINTENANCE � RESULTS EXPECTED WHEN COMPONENT 1 PRODL.EM ISNEEDED MAINTENANCE 18 PERFORMED Site I Trash and debris m - __,--- Trash and debris exceeds 1 cubic foot per Roadway drivable by maintenance 1 000 square feet (i -e., trash and debris vehicles - S would fill up one standards size garbage ? can)- j Debris which could damage vehicle tires or Roadway drivable by maintenance t prohibit use of road. vehicles. Contaminants and µ Any evidence of contaminants or pollution Materials removed and disposed of pollution such as oil, gasoline, concrete slurries or according to applicable regulations. Source i paint. control BMPs implemented if appropriate. ? No contaminants present other than a surface oil films Blocked roadway i Any obstruction which reduces clearance Roadway overhead clear to 14 Feet high. � above road surface to less than 14 feet. Any obstruction restricting the access to a At least 12 -foot of width on access road. IU- to 12 foot width for a distance of more ! than 12 feet or any paint restricting access to less than a 10 foot width. Road Surface Erosion, settlernent, Any surface defect which minders or road drivable by maintenance vehicles. ' potholes, soft spots, prevents maintenance access- 3 ruts ' Vegetation on road Trees or other vegetation prevent access Maintenance vehicles can access facility. surface to facility by maintenance vehicles. 1 1 Smoulders and Erosion Erosion within 1 foot of the roadway more Shoulder free of erosion and matching the ©itches than S inches wide and S inches deep- surrounding road. Weeds and brush Weeds and brush exceed 18 inches in � Weeds and brush cut to 2 inches in height � height or hinder maintenance access. or cleared in such a way as to allow maintenance access. Modular Grid Contaminants and Any evidence of contaminants or pollution Materials removed and disposed of Pavement pollution such as oil, gasoline, concrete slurrfes or according to applicable regulations. Source paint, control BMPs implemented if appropriate. No contaminants present other than a surface ail film - ................ M ..............._ Damaged or missing r _.._ Access surface compacted because of T Access road surface restored so road blockslgrids broken on missing Modular block. infiltrates - 12!1212.016 2017 City of Ronton Surface Water Design Manual A-1& APPENDIX REQUIREMENTS FOR STORIMWATER FACILITIES AND ON-SYJT- BMPS NO. � WEEPWAULT.::.%. ........ ... ... . ........... . . .......... . . . .... .... .... .... . - MAINTENANCE DEFECT OR CONDITION WHEN MAINTENANCE RESULTS EXPECTED WHEN COMPONENT PROBLEM IS NEEDED MAINTENANCE IS PERFORMED Site Trash and debris Trash and debris arrurnulated on facility Trash and debris removed from faciliiy site, ---- Treatment Area Trash and debris Any trash and debris accumulated in vault No trash or debris in vau:tt- (includes floalables and non-floatables). Sediment I Sediment accumulation in vault bottom No sediment in vault, i accurnulation 1 exceeds the depth of the sediment zone plus 6 inches- ---- - - - ------------------------- Contaminants and 3 Any evidence of contaminants or pollution Materials removed and disposed of pollution such as oil, gasoline, concrete slurries or according to applicable regulations. Source point. control BMPs implemented if appropriate - No contaminants present other than a surface oil film. Vault Structure Damage to wall, Cracks wider than'/2-inch, any evidence of Vault is sealed and structurally sound. frame, bottom, andlor soil entering the structure through cracks, top slab vault does not retain water or qualified inspection personnel determines that the vault is not structurally sound. Baffles damaged Baffles corroding, cracking, warping a nd-;cr--R-epair or replace baffles or walls to I showing signs of fa 11 ure or baffle cannot be specifications. removed. Ventilation area Ventilation area blocked or plugged. No reduction of ventilation area exists. blocked/plugged InietiOutlet Pipe Sediment Sediment filling 20% or more of the pipe. ............ .. - - - ------- E Inlet/outlet pipes clear of Sediment. accumulation Trash and debris ------------ Trash and debris accum0ated in - No trash or debris in pipes. inletJouflet piper, (includes floatables and Darnaged inletloutlet Cracks wider than Y.- Inch at the joint of the No cracks more than '/,inch wide a, the pipe inleVoutlet pipes or any evidence of soil joint of the in] etJoutlet pipe- ipeentering enteringat the joints of the inlet/outlet Pipes, Gravity Drain inoperable valve Valve will not open and dose- Valve opens and closes normally. Valve won't seal Valve does not seal Gomp'.etely- Valve completely seals closed. Access Manhole Access cover/lid Access coverAd cannot be easily opened Access cover/lid can be opened by one damaged or difficult to by one person- Corrosion/deformation of person - open coveNlid. Locking me&ianism Mechanism cannot be opened by one Mechanism opens With proper tools. not Working maintenance person with proper tools. Bolts cannot be seated. Self-locking r overli id does not work. Cover/lid ciffficuit to I One maintenance person cannot remove Coverilid can be removed and reinstalled remove i I coverilid after applying 80 lbs of lift, by one maintenance person. Access doors/plate Large access doors not flat and/or access Doors close flat; covers access opening has gaps, doesn't opening not completely covered. completely - cover completely Lifting rings missing, l Utng rings not capable of lifting weight of 1 -Ming rings sufficient to lift or remove door rusted door or plate.. or plate. Ladder rungs unsafe Missing rungs, misalignment, rust, or Ladder meats design standards- Allows cracks. maintenance person safe access - 12r 12/2016 2017 City of Renton Surface Water Design Manual A-24 APPENDIX A MAiNI-ENANCEF, RiiQUIRE MENFS FOR. S`I'ORMWA'i R FACILMES AND ON -SI" F, RM:PS NO�:. PERMEA PAVEMENT'BNiP; MAINTENANCE COMPONENT Preventive Porous Concrete, Porous Asphaltic Concrete, and Permeable Pavers Permeable Pavers DEFECT OR PROBLEM Surface cleaning/ vegetation control Trash and debris Sediment accumulation Insufficient infiltration rate Excessive ponding Broken or cracked pavement Settlement Moss growth Inflow restricted Underdrain riot freely flowing Overflow not controlling excess water Broken or missing Pavers Uneven surface Compaction Poor vegetation growth (;f applicable) CONDITIONS WHEN MAINTENANCE IS NEEDED Media surface vacuumed or pressure washed annually, vegetation controlled to design maximum- Weed growth suggesting sediment accumulation. Trash and debris on the pavement interfering with infi:tration; leaf drop in fail season. Sediment accumulation an the pavement interfering with infiltration: runoff from adjacent areas depositing sediment/debris on pavement. Pavement does not infi€trate at a rate of 10 inches per hour. Standing water for a long period of time on [tie surface of the pavement. Pavement is broken or cracked Uneven pavement surface indicating settlement of the subsurface layer. Moss growing on pavement interfering with infiltration. Inflow to the pavement Is diverted, restricted, or depositing sediment and debris on the pavement. Underdrain is not flowing when pavement has been infiltrating water. Overflow not controlling excess water to desired location; native soil is exposed or other signs of erosion damage are present. Broken or missing paving blocks on surface of pavement. Uneven surface due to settlement or scour of fill in the interstices of the paving blocks. Poor infiltration due to soil compaction between paving blocks. Grass in the interstices of the paving blocks is dead. RESULTS EXPECTED WHEN MAINTENANCE IS PERFORMED No dirt, sediment, or debris clogging porous media, or vegetation limiting infiltration. No trash or debris interfering with infiltration. Pavement iritiltrates as designed: adjacent areas stabilized. Pavement infiltrates at a rate greater than. 10 inches per hour. Standing water infiltrates at the desired rate. No broken pavement or cracks on the surface of the pavement. Pavement surface is uniformly level No moss interferes with infiltration. Inflow to pavement is unobstructed and not bringing sediment or debris to the pavement. Underdrain flows freely when water is present. Overflow permits excess water to leave the site at the desired location; Ovefflow is stabilized and appropriately armored. No missing or broken paving blocks interfering with infiftrafion. Pavement surface is uniformly level No soil compaction in the interstices of the paver blocks limiting infiltration. Healthy grass is growing in the interstices of the paver blocks. 2017 Cita of Renton Surface Water Design svtarual 1212!2016 A-41 AI'.P'ND1X A MAINITTE7NANNCI REQUIR.ENTENTS FOR STORM\VATER FACILITIES AND Uri -SITE BMPS %5[]CL AMENDMENT. MAINTENANCE DEFECT OR COMPONENT PROBLEM Soft Media Unhealthy vegetation CONDITIONS WHEN MAINTENANCE IS NEEDED Vegetation not fully covering ground surface or vegetation health is poor. Yellowing: possible Nitrogen (N) deficiency. Poor growth.- possible Phosphorous (P) deficiency- Poor flowering, spotting or curled leaves, or weak roots or sterns: possible Potassium (K) deficiency - RESULTS EXPECTED WHEN MAINTENANCE IS PERFORMED Plants are healthy and appropriate for site conditions Inadequate soil In the fall, return leaf fall and shredded Soil providing plant nutrients and structure nutrients and woody materials from the Iandscape to the structure site when possible g' Excessive vegetation Crass becomes excessively tall (greater Healthy turf- "grasscycle" (mulch -snow or i growth than 10 inches), nuisance weeds and other leave the clippings) to build turf health vegetation start to take over. Weeds Preventive maintenance Avoid use of pesticides (bug and weed killers), like "weed & feed,' which damage the soil _. Fertilizer needed Where fertilization is needed (mainly turf Integrated Pest Management (IPM) and annual flower beds), a moderate protocols for fertilization followed 1 fertilization prograrn should be used which relies on compost, natural fertilizers or s€ow-release synthetic balanced fertilizers s Bare spots Bare spots oil sol': No bare spots, area covered with vegetation or mulch mixed into the underlying soil. ) Compaction Poor infiltration due to soil compaction • To remediate compaction, aerate soil, till to at least 8 -inch depth, or ( further amend soil with compost and re -till • If areas are turf, aerate compacted areas and top dress them with Ilk to 112 inch of compost to renovate them ■ If drainage Is still slow, consider investigating aItern ative causes (e high wet season groundwater levels, low permeability soils) • Also consider site use and protection from com acting activities Poor infiltration Soils become waterlogged, do not appear ? to be inflltratinq- No soil compaction Facility infiltrating properly Erosion/Scouring Erosion Areas of potential erosion are visible Causes of erosion (e. g., concentrate flow entering area, channelization of runoff) identified and damaged area stabilized (regrade, rack, vegetation, erosion control matting).For deep channels or cuts (over 3 inches in ponding depth), temporary erosion control measures in place until permanent repairs can be made Grass/Vegetation Unhealthy vegetation t_ess than 75% of planted vegetation Is Healthy vegetation. Unhealthy plants healthy with a generally good appearance. removedireplaced. Appropriate vegetation planted in terms of exposure, soil and soil i moisture. Noxious Weeds Noxious weeds Listed noxious vegetation is present (refer € No noxious weeds present - to current County noxious weed list). 2017 City of Renton Surface Water Design ?Manual 12/12/2016 A-47 5.1.6 PRETREA'I'Ui"NT FACILITIF 4 If the area under the covered fueling island drains to the sanitary sewer, then only the remaining high -use area actually draining to the stone drainage system (normally ingress and egress routes) need comply with. the High -Use nnenu. Nate: Ecology requires that fireling islands he paved with Portland cement concrete (or equivalent, not including asphaltic concrete) and must drain to a dead-end sump or spill control separator in rornpliance with the S'I'C or JF C, and recommends draining from the .sump to a sanitary server. An alternative trt discharge to a .sanitary sewer is to collect ,stormwnter from the fuel island containment pad and hold for proper off-site disposal. Drains to treatment facilities must have a normally closed shutoff valve. The spill control sump must be sized in compliance with Section 7901,8 of the tJniforrn Fire Code (UFC}. Alternativcly the fueling island must be designed as a spill containment pad with a sill or berm raised to a minimum of four inches (Section 7901.8 of the 1.IFC) to prevent the runoff of spilled liquids and to prevent .run-on. of stormwater from the surrounding area.. (See Ecology's Stormwater Management Manual for Western Washington, Volume IV, Section 2.2, 5409 BM:Ps for Fueling At .Dedicated Stations. 'these 137V•MPs are also required by the City of Renton. for .new construction. 6.I.6 PRE,ETREATMENT FACILITIES © PRETREATMENT FACILITIES OPTION 'I — PROPRIETARY FACILITY DESIGN Current approvals for publicly and privately maintained systems are included. in Table 6.1.6. A and Reference Section 14-A and 14-I3. TABLE 6.1.5A PROPR .ETA lkY FACILITIES ON .THE PRETREATMENT FACILITIES 1►IENiJ.: Proprietary Facility Name Publicly Maintained Privately Maintained Aqua -Swirl System x CDS Stormwater Treatment System X ------ ...._...._.__- Vortechs System ? X Downstream Defender ._.W.w_.......�...._....m_..._ .__. x_..�.�.._..�._.m_ -- ..................� ........� � _..'.� ......... � _.... _...._. �.w.. . Storrnceptor X Cather l=adlit€es with a General Use X Level Designation (GOLD) for Pretreatment 2017 City of Renton Surface Water Design Manual 12111'2016 6-17 R e� CDE 0 COO q r f cis A Q N _`_ v b 6 3 E Q .❑r C N .,.., rip j 'CS A7 tiS N ,�" N � v7 .a cF. A _ j '&] w ❑ U r [� N C N 6t U C SSS N C1 4] p7 2 E �. .p W ❑.-- N tl 9 © ❑ C N fu ,.., p- 4 6 C3 p d] d3 'N 3 0 [7] 'p Or w u1 E [L• CC? P iC cl+ U N C L 0 N jol m C C71' E; C�] 6] [[1 N 9a 0 d p C L b U E [ 4i N 4 O7 .... C -ru q 6 ..-• c!i C C LO U❑ m m c a Ci$ q W)u Q. !]7 ti` N w2 0] 4 c C: U2 'Y �� LM A C o N m L1 a r} U i7 N �Ei U 4t x... ❑ t[1 U.' JJ N 3ij -0 v: (6 0.1 CO ❑ ME P fl. N U �.".�'d` C} k i] R3 H C3 L �' 07 N {. N AS A m is5 U C4 E C C N 4= � � j ass p CS aiu U 2 X43 w m as aZE n T c 0 a c v c 0 a� ca � ra" m € � ¢ q CL G m ��3 '� C � N �- � � :W ❑. m m ivr m U7 u� �3Cl c CJ C UJ c G7 .� TF N E LL � p C n i1 cl rJ 6 C C C O mo i... - p.1 w C% R V 'U' O c] N Z'M N O ❑ C m R O t7 p co -•" R7 2 R Z C S 41 ,ANG CSS U 'L5 L] N U, w d -. C .` [6 w C 'C] .�-. N R Q; � � C O 7 ?' � u N � � 67 •16 � � � � N uNs A 4W L m 0 ¢ N 0 �1 C E a i Vi(a °gym N Q b � 2 �UQN p CA C7 2 a pwa U) w tfS . .0 0 a --` ,--1 C i � m s � CL v m Q l�inr 0] SA ¢ 4U _d U U3 Q 431 ,fl? d3 d C cz !33 ES. > .........w�..._.,...__......... ¢ ¢ c 0 a� � ra" m FE U7 i7S w- yam. � i1 0 c o s rt L.1.. L1 A Z 1u w a CL p D C] 0 U� -a SCS c U) w tfS . .0 0 a --` ,--1 C i � 0CLN s CL .ui iirCi Q l�inr U7 ,fl? d3 d C cz !33 > iii O E u, (D p a� Z � o �}] Cid rLr1,, V C] > 0 o 4) SII 0 v ` 0<, o Z Q U) Z S 7 CO • � U a o U) W a c C- a Cl) m U0............. M o n cs co Q� < ; r7 c! i co co c3 cu cu Q; U r M co m r' i co co , cU '•- c�i ni to i ; to cn 0 ; € CL oo 4) 0... tL lr� zCrD [ts ' :. 0.`: 0. �aco . ...�..�... .�.. ;.w jII s. M. Lo M 0 ' �r �r d ori 4 ; L6 co O fw.: : '.'..:: E t t U') LOCO 00 3 m 7 m 4)., .. r j r^ ! r r r C\i N CZ �f C7::::..:::::';.';.: �J M c 4L3 '. LO 117 CO Co (,O CO CO OD 4 a- cn W C] N Ca 7 m 0 Lo Cl) C w+ f/7.: iti'... ;:'' .. ;: . tom` O cq 0 N 0 0 CO 0 i CL 0 r 0 0 d C7 v N C� N ? � w co co co , co 'rt' �1 co U) 'Cr U7 a f{3 U) C) U 0 C) 0 U U U Stormffieche Sage Valuable Land and Dafenfiorr•Re?ention-WaterOually .A division of Protect Water Resources .............. . 01, kv, Isolatoe Row O&M Manual StormTech"' Chamber System for Stormwater Management -15 Isolatoe Row O&M Manual StormTech"' Chamber System for Stormwater Management 1.0 Thes o -Raw 1.1 INTRODUCTION An important component of any Siormwater Pol ution Prevention Pian: is inspection and maintenance. The Starml'erh lso[aior Kati, is a patented technique to inexpensively enhance Total Sujspendeci So ids (TSS) removal and provide easy access for inspection and maintenance. Looking down P, e Isolafm Row from the manhole opening, vdaver geotext?le is shown bi fhveen the cham6arand stone base. 1.2 THE ISOLATOR ROW The lso;ator flows a row of StormTech chambers, either S„'-3 107, SC -•3101-3, SC -7407, DC -780, MC -3500 or MC - 4500 models. that is surrounded with filter fabric and con- neued o a closely located manhole for easy access. The fabric -wrapped chambers provide for setting and € 'ra- tion of sediment as stomp water rises in the Isolator Row and ultrnately passes through the filter fabric;. 1'he open bottorn chambers and perforated sidewalls (SC -3101, SC - 310 -3 and SC -740 models) allow storm. water to flow both verically arse horizonta€ly out of the clambers. Sediments are captured in. the €solator Row protecting the storage areas of the adjacent stone and chambers frorn sediment; accumulation. Two different fabrics are used for the isolator Row. A woven geotexrlle `abric is placed between the stony: and the Isolator Row chambers. The tough geotextile provides a media for storm water filtration and provides a durable surface for maintenance operations. it is also designed T.o prevent scour of the underlying stone and remain intact, during high pressure jel'ing. A non -woven fabric is placer over he chambers to provide a fi?e;r media for flows oassing though the perforations in the sidewall of the, charnb€;r. The nor: -woven fabric is not required over the DC -780, MC -3500 or MC -4500 models as these charnbers do not have perforated Nide walls. The IsoWor Row is '.yp:cal=y designed to can.ure the "first flush" and offers the versatility to be sized on a vol- urne bass or flow rate basis, An upstream manhole no only provides access to the :solator Row but typically includes a high flow weir such that storm water f:owrates or vclun?es that exceed the capacity of the isolator Row overtop the over flow weir and discharge through a manifold ra the orrer &.,ambers. 1 -he lso'ator Row may also be part of a treatment, train. fay treating storm water prior to entry into the chamber system, the service ilfe can be extended and pollutants such as hydrocarbons can be captured. Pre-treatment best rnaragerren; practices can be as simple as deep surno caich basins; oil -water seaarators or can he inno- vallve storm water treatment devices. The design of the, treatment leas . and selection of pretreatm6nt devices by the design engineer is often driven by regulatory requlre`nents• Whether pretreatment Is Used, or not, the Isolafm Row is recommended by Storm ech as an effective rneans to rrinim ze maintenance requ rements and maintenance ccs€s. Note, See the Storm Tech Design AvlanuaI for detailed in.`6erriatior, on designing inlets for a Storm. Tech system, inciuding the Isolator Rove. StarmTech Isolator Row with Overflow Spillway ;not to scala) WITH OvE!Ar ow 'A'ER ECCENTRIC HEADER OPTIONAL ACCESS ovrIONAt. PRE-'REATMENr ST0R?•A;- C t iSOLATOQ. ROW _ 7" [7R, tiEG•ri CHAMBERS 2 Cail tormTesch a 888.892.2694 or v=.sit our wob2ite. at www.stormtech.com for tech.ncel and nrodu--t :rfcrma=.ion. �r�� —�'„ 1 _ 7" [7R, tiEG•ri CHAMBERS 2 Cail tormTesch a 888.892.2694 or v=.sit our wob2ite. at www.stormtech.com for tech.ncel and nrodu--t :rfcrma=.ion. 2,0 is Wt H Rove asp tion/Ma ntenanc Stormfech� 2.] INSPECTION rh,e frequency of Inspection and Maintenance varves by locaflon. A routine inspection scheduie needs to be established for each mdmdual Iaca'ion based unon site specific variables. The ype of land use {i.e.industrial, commercial, residential), anticipates: pollutant load, per - rent impserviousr;ess, climate, etc. a € play a c;ritica! role in determining the actual frequency of inspection and rr:ainienance pracuces. At a minimurn, Starrr•-:ech recornmends annual inspec- tions. Initially, the Isolator Row shou€d be inspected every 6 months for the first year of operation. For subsequent years, the inspection shou''=.d be adusted based :upon previous observation of sedirnert; deposltJon, The Isolator Row ;ncoroorates a combination of standard manhole(s) and strategically loca ed inspection ports (as needed). The inspection ports allow for easy access to the system frorn the surface, eliminating the need to perform a confined space entry for inspection purposes. If upon: visual inspection It is found that sediment has azxcurnulated, a s?adia rod should be inserted to deter- mine the depth of sed€rnent. When the average depth of sediment exceeds 3 inches'`=roughcut the length of the Isoiator- Row, clean-out should be performed. 2.2 MAINTENANCE The Isolator Row was designed io reduce the cost of periodic maintenance. By "isolating" sedi-ne its to jus: one row. costs are dramatically reduced by eliminating the need io clean out ash row of the entire storage bed, 'f Inspect=ori indicates the potential need for ITmain- tenanca, access is provided via a rn,arahole(s) located on tho and(s) of the row for cleanout. I; entry into the manhole is roquiread, piease follow iocai and OSSA rules for a confined space entries. StormTech Isolator Row snot to scale) (,AN H. 8A,' .W oft SLIMP DEPTH DY :]P 319!:tq :.tl$Pf:C YIC PYJHT �Cf,-.�:i Y: PFR Examples of culvert cleaning nozzles appropriate for f;olator Row maw tenance. (Those are no Stora, Tech products.) Maintenance is accomplished with the JetVac process - The JetVac process utilizes a high oressure water noz- zle to propel itself down the Isolator Row whiie scouring and suspending sediments. As the nozzle'; ;s retrieved, the captured pollutants are flushed back into She man- hole for vacuuming, Most sewer and pipe maintenance cornpanies have vacu{urn/JetVac comoinatlan vehicles. Selection of an appropriate JetVac nozzle w€II improve maintenance efficiency. Rxed s;oz.zles deigned for cul- verts or large 6arneter pipe cleaning are preferable. Rear :acing jets with an effective spread of at least 45" are best. Most Ja.Vac reels have 400 ieef of hose allow - mg maintenance of an Isolator Row up to 50 chambers Iong. The JetVac process shall only be performed on StormTech Isolator Rows that have AASHTO class 'f woven geotextile (as specified by StormTech) over their angular base stone. C 2. LNj.uE FUJI V." -'H A19 £0=T NCYd;•�U� ?J i-EC.'EESI ILE E0l ECIUALI F •140 •' •;1.e ry l.SpE SAH' �ISG'-0] tiI I?Y.YN) �1. LAYEt<5.7 -S BIS—VEN ;.l-1ALI aG•'1aC••C��•]9l. !.FG'a�6'.&?.1 "" O-]+'[ ^'m PIPE Ems:J1E=N =NE DA3c A£a: �FRN6eR5 .,��O8 i^_-1i:a-52'[--A..-rr..3?IPE Cw.l•1HliR;.Pr^. F^t(Y hti3 M,4YYt _.Un'(3.s-n; Va`:GF, ST:cIP (nPa'S55'NfAI'i 1.+[}3.5!1 -5-2i (Z.5 W�0r; $'f -31P !.i.'a 333w71.11 Sr.-Ya1a:7G?SC-. i l.5 �i wry Ssa�[Aa531 �wr� -<' F 1.2 WN NOTE, NCFN-NJOVEN FABRIC 1 0N,LY 9EQUzRED OVER T'I-i INLET PIPE CCNNECTI CN INTO: THE E. ND CAP FOR OC -780, MC 1500 AND MC -4500 tCHAM BER M0 J.^`LS AND IS NO'T RE4u€HEC] OVER THE ENTIRE IS0DAM P, RIDW.. ��C.a€I SrwrnR-ch a- 888.892.2694 or visit out webs"#e a` www.stormtech.com far- ,eche= _Ial and prodwrl infommtion. 3 3.0 IsaMator Row Step By Step Maintenance Procedures Step 1) Inspect Isolator Row #r --,r sediment Storm7ech Isolator Roth (not to scale) A; inspection pats f if present) Remove lid from floor box frame ii. Remove cap from inspection riser iii. Using a flashlight and stadia rod, measum depth of sedin ent and record results on maintenance log. iv. I' sediment is at, o: above, 3 inch depth proceed to Step 2. If not proceed to step 3- 8) A:1 Isolator flows i. Remove cover from manhole at upstream end o` Isolator Row ii. Using a flashlight, inspect down Isolator Row through outlet pipe 1. Mirrors on poles or cameras may be used to avoid a confined space entry 2. Follow OSHA regularions for confined space entry if entering manhole ii% if sed€ment is at or above :he lower soli of sidewall ho=es (anorox'mately 3 inches) proceed to Step 2. if not proceed to Step 3. Step 2) ,'lean out isolator Row using the JetVac process A) A fixed culvert cleaning nozzle wiih rear -acing nozzle spread of 415 inches or more is :,referable E) Apply MWIJple passes of JeNac until backflush wa°er is cEean C) Vacuum man -hole sumo as fequlred Step 3) Replace all caps, lids and covers, record observations and actions Step 4) Inspect & clear: catch basins and manholes upstrearn of he StormTech sysiem Sample Maintertance Log a Stor ie hq" Delef'hon • Rmnffnrr • WateP Gualay A division o f �itil� a 70 narood i?aad, S01., 3 Rocky-9i•.i I Connwkut 105067 860.829.8`88 888.892.2694 `ax866.32&840; i mm-serrnlecn.com ADS 'TPrms and Conditions of Sale' are available an N,, ADS lvebsi;e, �vvm,.ads- pim.corn Advanced Drainage Systems, the ADS logo, and t^e green stripe are reg iste:ed trademarks of Advanced Drainage Sys Wns. Stormlech"I and Il Isolator" :how are registered [rade. marks of Slo<<nTecll, Inc. Gree!l 6lrildirig Ca;3rci? Memf:er ?.:•go is a ren isfered trademark of the US. Green building Council, #1 i 0o 103/16 CEJ 2013 Advanced Drairge Systems, 45nt.