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HomeMy WebLinkAboutSWP272194(1) STORM DRAINAGE REPORT 2 ( qq FOR K&N MEATS RENTON, WASHINGTON BY BUSH, ROED & HITCHINGS 2009 MINOR AVENUE EAST SEATTLE, WA 98102 (206) 323-4144 crty or RE roN CONTACT: JOHN E. ANDERSON, P.E. R E C E I V E FES 1 0 ti d BUILDiw—, uIVISlO►� h 4 26878 `V ISTER�� I ss1OxAL EXPIRES 12/1/ Q$ TABLE OF CONTENTS ' Page No. I. Project Overview E. Preliminary Conditions Summary III. Off-Site Analysis IV. Retention/Detention Analysis and Design V. Conveyance Systems Analysis and Design VI. Special Reports and Studies VII. Basin and Community Planning Areas VIII. Other Permits IX. Erosion/Sedimentation Control Design x Bond Quantities Work Sheet, Retention/Detention Facility, Summary Sheet and Sketch, and Declaration of Covenant XI. Maintenance and Operations Manual XII. Appendix I. PROJECT OVERVIEW K&N Meats is a 6 . 5 acre site located along Powell Avenue, just north of Southwest 7th Street. The project is located on lots 3 and 4 of Washington Tech Center, in Renton Washington. The current property owner, Lowe Enterprises, has an approved building permit for construction of an office/warehouse building. The site development proposed for this project is smaller than the approved development plan. Page 1 of 2 King County Building and Land Development Division TECHNICAL INFORMATION REPORT (TIR) WORKSHEET PROJECTPART I OWNER AND PART 2 PROJECT • • PROJECTAND DESCRIPTION Project Owner Project Name V�ir�TS Address Location Phone Township Project Engineer Range B {-� Section Company Project Size Le-5 4,(- AC Address Phone �Zz ' �'��Gt' Upstream Drainage Basin Size C" AC PART 3TYPE,OF PERMIT APPLICATION PART 4 OTHER PERMITS 0 Subdivision DOF/G HPA Shoreline Management 0 Short Subdivision COE 404 Rockery Grading DOE Dam Safety 0 Structural Vaults J Commercial FEMA Fiood*n Other Other COE Wetlands O HPA PART 5 SITE COMMUNITY . DRAINAGE Community Drainage Basin PART 6 SITE CHARACTERISTICS River Floodplain Stream Wetlands O Critical Stream Reach Seeps/Springs Depressions/Swales High Groundwater Table Lake 0 Groundwater Recharge Steep Slopes Other Lakeside/Erosion Hazard oj1 T pe`' \\ Slopes Erosion Potential Erosive Velocities �T� 1 CIO i 1,✓'.�Z!1� � FC,� Additional Sheets Attatched 1/90 Page 2 of 2 King County Building and Land Development Division TECHNICAL INFORMATION REPORT (TIR) WORKSHEET PART 8 DEVELOPMENT LIMITATIONS REFERENCE LIMITATIOWSITE CONSTRAINT 0 Ch,4-Downstream Analysis a a 0 0 a Additional Sheets Attatched PART 9 ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION FOLLOWING CONSTRUCTION Sedimentation Facilities Stabilize Exposed.Surface ® Stabilized Construction Entrance © Remove and Restore Temporary ESC,Facilities ® Perimeter Runoff Control Clean and Remove All Silt and Debris 0 Clearing and Grading Restrictions © Ensure Operation of Permanent Facilities Cover Practices Flag Limits of NGPES Construction Sequence Other Other PART 10 SURFACE WATER SYSTEM Q Grass Lined Channel Tank 0 Infiltration Method of Analysis Pipe System Vault Depression t� C. i A\a`D Open Channel Energy Dissapator Flow Dispersal Compensation/Mitigation Dry Pond Wettand Waiver . _ of Eliminated Site Storage Wet Pond 0 Stream Regional Detention A Brief Description of System Operation �A� cI�T ACAS �►� tit `to SWS ` �VlAt,l1�T �-� UJtLt, i 7,�,IQl C_� —� Tl=r✓ �kr5? u1�- -ZL—� Facility Related Site Limitations Additional Sheets Attatched Reference Facility Limitation PART 11 STRUCTURAL ANALYSIS PART 12 EASEMENTSITRACTS (May require special structural review) � Drainage Easement = Cast in Place Vault Other 0 Access Easement Retaining Wall Native Growth Protection Easement Rockery>4'High 0 Tract 0 Structural on Steep Slope 0 Other ENGINEERART 14 SIGNATURE OF PROFESSIONAL 1 I or a civil engineer under my supervision have visited the site. Actual ' she conditions as observed were incorporated into this worksheet and the 1 attatchments. To the best of my knowledge the information provided here Is accurate. aar+ J 1/90 AV :4 ST sT R 0 .8 EN N S 12 IL St 'if �y Is Vtlapt z Fe S. tT A t AIMPOR7 W sr -lk s ZI 2ND 4z —3J RIVE EA-L' ll -K U-tA wk IT- t.70-- z 0,4 TI Ai v ya lRace U FK Track X -'r K I VICINITY MAP II. PRELIMINARY CONDITIONS SUMMARY K&N Meats is proposing the construction of a meat processing facility on lots 3 and 4 of the Washington Technical Center plat within the City of Renton, Washington. The 6. 5 acre site is located along the east side of Powell Avenue Southwest north of Southwest 7th Street. Bush, Roed & Hitchings completed construction plans for larger building proposed by Lowe Enterprises for this site in 1992. Lowe Enterprises are in the process of selling the property to K&N Meats. The development proposed by K&N Meats has a much smaller building and different site plan than approved under the Lowe Enterprises project. The existing site is vegetated with grasses, bushes and trees. It appears the site has been filled along the southern half. Storm water run-off sheet flows northward to the existing drainage ditch. The site is located within an area which drains to a regional detention facility and therefore on site storm water detention is not required. Storm water run-off from the areas subject to vehicular travel will be treated by biofiltration and then conveyed to a wetvault prior to discharge to the downstream channel . The wetvault will be located in the northwest corner of the site. King County Design Standards have been used to size the wetvault. There are plans to expand the facility in the future. The proposed wetvault has been sized to include the future parking areas within lots 3 and 4 . Storm water run-off from the roof areas will be conveyed directly to the existing ditch along the north property line. Three biofiltration swales are being proposed around the site for the parking areas. Breaking the parking area into smaller tributary areas results in a narrower swale bottom width because of the smaller storm water run-off rates. Test result have shown that longer swales produce better water quality. This layout should produce a higher water quality than a single 200 foot long swale system. The following values were input into the WATERWORKS program: CN: 86 new landscape areas CN: 98 new asphalt concrete parking areas Tc: 15 min. for the Wetvault design Tc: 5 min. for the biofiltration swale design Pt-wq: 0 .67 inches for the wetvault inflow P2: 2 . 0 inches for the biofiltration P100: 3 . 9 inches to check the peak run-off from the parking KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TABLE 3.S.2C "n" AND "k" VALUES USED IN TIME CALCULATIONS FOR HYDROGRAPHS r n;Shoot Flow Equation Mafv*V's Values(For the ir"300 11 of trove() Smooth surtecee(concrete.asphalt,gravok or bare hard Packed sue) pAt t Fasow feids or loose sot eutace(no residue) 0 05 Cukkased sos with residue corer(s c-0.20 1t/11) C 06 GL vated sd with reside cover(S>020 tt/N) 0.17 Short prairie Orals and Lawns _ 0.15 Dertso grasses a24 Bermuda grin 0.41 P4ngo(man a 13 Woods or forest with 2g t underbrush 0.40 Woods or forest with dense txderbrush 020 •Ma rwig values la sheet 11ow only,from Overton and Meadows 1976(Sao TR-a,1900 V Values Used in Travel T)me/Trne of Concert hROW C kdal tuts Shallow Cortcentaled Flow (After the irAW 300 R.0(sheet flow,R 0.1) k. 1. Forest with heavy ground user and meadows(n-0.10) 3 2. Brushy ground with some trees(n-ODW) 5 3. Feltow or n**ntm tllage mAlvatlon(n -0.O40) 11 1 9 4. Figh grass(n.0.035) S Short grass.Pasture and lawns(n-0.030) 11 6 Nearty bare ground(n-0.025) 13 7. Paved and gravel areas(n-0.012) 27 Charvtel Flow prrermittent)(At the begkv*V of visUo charnels:R.02) k. 1. Forested swale wth heavy ground War(n - 0.10) 5 2. forested drainage course/ravine wth defined chanrW bed(n-0.050) 10 3. Flock-lined waterway(n-0.035) 15 4. Grassed waterway(n-0.030) 17 5. Earthd4ted waterway(n-0.C25) 20 tit CUP pips(n-0.024) 21 7. Co=ew pipe(0.012) 42 6 Other waterways and pipes 0.5M/n CnanrW Flow(Corrkx,ous cream,R - 0.4) k. 9. Meandering steam wth sane pods(n . 0.040) 20 10. Roc*4nsd susam(n-0.035) 23 11. Grass-iined sire]m(n-0.OX) 27 1 12. Other susams,man-made chanrWs arid Pip C a07/n•• --Sas Chapter 5,Table 5.3.6C for additlorei Mantis•n'values for open chareWs 3.5.2-7 I/90 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL _TABLE 3S.2B SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS j SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS (Published by SCS in 1982) Runoff curve numbers for selected agricultural, suburban and urban land use for Type 1A rainfall distribution, 24-hour storm duration. CURVE NUMBERS BY HYDROLOGIC SOIL GROUP LAND USE DESCRIPTION A B C D Cultivated land(1): winter condition 86; 91 94 95 Mountain open areas: low growing brush and grasslands 74 82 89 92 Meadow or pasture: 65 78 85 89 Wood or forest land: undisturbed 42 64 76 81 Wood or forest land: young second growth or brush 55 72 81 86 Orchard: with cover crop 81 88 92 94 Open spaces, lawns, parks, golf courses, cemeteries, Landscaping. - good condition: grass cover on 75% or more of the area 68 80 86 90 fair condition: grass cover on 50% to 75% of the area 77 85 90 92 Gravel roads and parking lots 76 85 89 91 Dirt roads and parking lots 72 82 87 89 Impervious surfaces, pavement, roots, etc. 98 98 98 98 Open water bodies: takes, wetlands, ponds, etc. 100 100 100 100 Single Family Residential (2) Dwelling Unit/Gross Acre % Impervious (3) 1.0 DU/GA 15 Separate curve number 1.5 DU/GA 20 shall be selected 2.0 DU/GA 25 for pervious and 2.5 DU/GA 30 impervious portion 3.0 DU/GA 34 of the site or basin 3.5 DU/GA 38 4.0 DU/GA 42 4.5 DU/GA 46 5.0 DU/GA 48 . 5.5 DU/GA 50 6.0 DU/GA 52 6.5 DU/GA 54 7.0 DU/GA 56 Planned unit developments, % impervious condominiums, apartments, must be computed commercial business and industrial areas. (1) For a more detailed description of agricultural land use curve numbers refer to National Engineering Handbook, Section 4, Hydrology, Chapter 9, August 1972. (2) Assumes root and driveway runoff is directed into street/storm system. (3) The remaining pervious areas (lawn) are considered to be in good condition for these curve numbers. i 3.5.2-3 1/90 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL 1 FIGURE 3.5.2A HYDROLOGIC SOIL GROUP OF THE SOILS IN KING COUNTY HYDROLOGIC HYDROLOGIC SOIL GROUP GROUP' SOIL GROUP GROUP* Alderwood C Orcas Peat D Arents, A.Iderwood Material C Oridia D Arents, Everett Material B Ovall C Beausite C Pdchuck C Bellingham D Puget D Briscot D Puyallup B Bucldey D Ragnar B Coastal Beaches Variable Renton D Earimont Sat Loam D Riverwash Variable Edgewick C Sala] C Everett A Sammamish D Indianola A Seattle D K=p C Shacar D Kaus C Si Sat C Mixed Alluvial Land Variable - Snohomish - D Nedton A Sultan C Newberg B Tukwila D Nooksack C Urban -n---- VariaW Normal Sandy Loam D Woodinville D HYDROLOGIC SOIL GROUP CLASSIFICATIONS A. (Low runoff potential). Sods having high infntration rates, even when thoroughly wetted, and consisting chiefly of deep,well-to-excessively drained sands or gravels. These sods have a high rate of water transmission. B. (Moderately low runoff potential). Sods having moderate infiltration rates when thoroughly wetted, and consisting chiefly of moderately fine to moderately coarse textures. These sods have a moderate rate of water transmission.- C. (Moderately high runoff potential). Sods having slow infiltration rates when thoroughly wetted, and consisting chiefly of sods with a layer that impedes downward movement of water, or soils with moderately fine to fine textures. These soils have a slow rate of water transmission. D. (High runoff potential). Soils having very slow infiltration rates when thoroughly wetted and consisting chiefly of day soils with a high swelling potential, sods with a permanent high water table, sods with a hardpan or day layer at or near the surface, and shallow sods over nearly impervious material. These sods have a very slow rate of water transmission. From SCS,TR-55, Second Edition, June 1986, Exhibit A-1. Revisions made from SCS, Sod Interpretation Record, Form #5, September 1988. 3.5.2-2 I/90 • • • • • '�` � �ii PFI 44 ■fir � �i� �,, ''���.;• � 1..�.•- III�R Il INK '�'�� ,��l� � ��► .A -ter � t, .. MITIFIRM30 ----.!L Or '5F Mt,►a, _ W ON m IP ILM MAMMI t i ins � � `�•�;'•.� �� y ���. . . LW,ARIP-Mr - - 1 Vol Iry imp MW I Ire ffilioll 6 i i OWN I Rol .w-ry Eff Me • 1 Pop dp ��� � .wir•��� r !�Fi OWN • • 1 -ten« III. OFF-SITE ANALYSIS A) OFF-SITE DRAINAGE TO THE SITE The only off-site drainage to the site will be from the western half of the rail road right-of-way. Total tributary area is approximately 0.11 acres. Storm water run-off from this area will sheet flow northward on undisturbed ground to the existing ditch at the north property line. This drainage pattern will not be changed by the proposed development. B) OFF-SITE DOWNSTREAM ANALYSIS Storm water run-off from the site parking areas will be tight lined to a 36 inch culvert crossing beneath Powell Avenue. The roof areas will be conveyed directly to the existing ditch along the north property line which flow to the 36 inch diameter culvert beneath Powell Avenue. The 36 inch culvert discharges into a man made ditch that flows west. The ditch is typically 10 foot wider at the bottom with 2 :1 (H:V) side slopes and a channel slope of approximately 0 . 3 percent. _ The ditch flows into a 73 inch by 55 inch arch culvert at Naches Avenue. From the culvert the flow continues in a southwesterly direction with final discharge into the P-1 channel . IV. RETENTION/DETENTION ANALYSIS AND DESIGN The subject site is within a commercial plat which does not require storm water detention. Since the impervious surface area subject to vehicular traffic is greater than one acre, a wetvault will be required. The wetvault has been sized according to the 1990 King County Design Manual standards and includes the future parking lot expansion. S 1/20/94 Bush, Roed & Hitchings, Inc. page 1 K&N MEATS JOHN E. ANDERSON, P.E. 93278 BASIN SUMMARY BASIN ID: B1 NAME: PT-WQ STORM SBUH METHODOLOGY TOTAL AREA. . . . . . . : 2. 40 Acres BASEFLOWS: 0 . 00 cfs RAINFALL TYPE. . . . : USER1 PERVIOUS AREA PRECIPITATION. . . . : 0.67 inches AREA. . : 0 .00 Acres TIME INTERVAL. . . . : 10 .00 min CN. . . . : 86 . 00 TIME OF CONC. . . . . : 15. 00 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 . 20 AREA. . : 2 . 40 Acres CN. . . . . 96 . 00 PEAK RATE: 0. 27 cfs VOL: 0. 10 Ac-ft TIME: 480 min BASIN ID: B2 NAME: 100 developed from A.C.P. SBUH METHODOLOGY TOTAL AREA. . . . . . . : 2 .40 Acres BASEFLOWS: 0 . 00 cfs RAINFALL TYPE. . . . : USER1 PERVIOUS AREA PRECIPITATION. . . . : 3 .90 inches AREA. . : 0 . 00 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 86 .00 TIME OF CONC. . . . . : 15.00 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 . 20 AREA. . : 2 . 40 Acres CN. . . . . 98 .00 PEAK RATE: 2.04 cfs VOL: 0 . 73 Ac-ft TIME: 480 min BASIN ID: B3 NAME: SOUTH & N.E. SWALE 2 YR FLOW SCS METHODOLOGY - r TOTAL AREA. . . . . . . : 1 .00 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : USER1 PERVIOUS AREA PRECIPITATION. . . . : 2 .00 inches AREA. . : 0.00 Acres TIME INTERVAL. . . . : 10 .00 min CN. . . . : 86 .00 TIME OF CONC. . . . . : 5.00 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 . 20 AREA. . : 1. 00 Acres CN. . . . . 98 . 00 PEAK RATE: 0.62 cfs VOL: 0 . 15 Ac-ft TIME: 460 min s 1/20/94 Bush, Roed & Hitchings, Inc. page 2 K&N MEATS JOHN E. ANDERSON, P.E. 93278 BASIN SUMMARY BASIN ID: B4 NAME: NORTH WEST SWALE 2 YR FLOW SCS METHODOLOGY TOTAL AREA. . . . . . . : 0.14 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. .- . . : USER1 PERVIOUS AREA PRECIPITATION. . . . : 2 .00 inches AREA. . : 0.00 Acres TIME INTERVAL. . . . : 10 .00 min CN. . . . : 86 . 00 TIME OF CONC. . . . . : 5.00 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 .20 AREA. . : 0. 14 Acres CN. . . . . 98. 00 PEAK RATE: 0 .09 cfs VOL: 0.02 Ac-ft TIME: 460 min t 1/20/94 Bush, Roed & Hitchings, Inc. page 3 K&N MEATS JOHN E. ANDERSON, P.E. 93278 ------------------------------------------------------------------- HYDROGRAPH SUMMARY PEAK TIME VOLUME HYD RUNOFF OF OF Contrib NUM RATE PEAK HYDRO Area cfs min. cf-AcFt Acres --------------------------------------------- 1 0 . 271 480 4139 cf 2. 40 2 2 . 036_ 480 31933 cf 2.40 3 0 .618 460 6453 cf 1 .00 4 0. 086 460 903 cf 0. 14 BUSH, ROED & HITCHINGS. INC. Joe CIVIL ENGINEERS & LAND SURVEYORS 2009 Minor Avenue East SHEET NO. OF Seattle.WA 98102 CALCULATED BY DATE (206) 323-4144 B RH (206) 323-7135 * Fax CHECKED BY DATE }� SCALE V = t oa 3 Ve cr- -r`C 5 G-1 ►'n o>z FT w(�7c— �r��►.� • � S�� S��c Foy '��?�'bs~�� � t-O�^s?' d • ZG1�7o RSSur�� d �•a �c � Nil- SAVE SEc r1oAJ SwA c p Qz = o,og Gas cam Ate, �T�� � F7 1.�1!r7E �"fl��i�r✓1 oP Fo2 L�rzr55 LrxJED ��y� V ; a072 ?ROpuL'Y.r-tlkSt Snxsi XbIP700e0r Qe:rc ,JaCn Niq J' 'o xOr�+pk'O�.AfE r.d0G7L�63d' BUSH, ROED & HITCHINGS, INC. JOB CIVIL ENGINEERS & LAND SURVEYORS 2009 Minor Avenue East SHEET NO. OF Seattle,WA 98102 CALCULATED BY J DATE r (206) 323-4144 H (206) 323-7135 * Fax CHECKED BY DATE SCALE 1-4 v _ VI-1 L'- zS o - — rvl ifs �'2�=r•' =' / / �-,��,�, i l Zap 5r ��✓�r�EI� ✓ E �O�Ury? �3,�C= �5(0 =//ZOOS _ �• (o.�i �T VO L U rr /v CX G� VlqVt—T i j Tb l clErIAu.LT 50 lA1F7/14aL7- L1,44/ I'L/Ul"4 . 77 ���� r��%� rr. �',o z� DIET✓�J(�i ��16l� �GGu� 77VEv� Z/, ✓leery k !7,e 77 0 / 6�1)PA,45 PI RL. c/,'0AZ/77v1xp n+oas;xr,s+q.snxsi ms:hm.a��a� ram wss 7ur -,cron�[.cc�,aoo-�sae„ V. PIPE SIZING CALCULATIONS The out let pipe from the wetvault has the largest tributary area of approximately 2 . 4 acres. From hydrograph B2 the 100 year developed peak flow rate is 2.04 cfs. All storm pipes for the project will have a slope of 0. 5 percent. Check a 12 inch smooth bore pipe using the Manning Equation: Q FULL = 2 .7 CFS _ V FULL = 3 . 4 FPS V @ 2 .04 CFS = 3 .7 FPS Since the last run of 12 inch pipe has capacity of convey the developed 100 year peak flow, it is obvious that all of the upstream 12 inch pipes will have adequate capacity. r r i VI. SPECIAL REPORTS AND STUDIES VII. BASIN AND COMMUNITY PLANNING AREAS VIII. OTHER PERMITS IM EROSION/SEDIMENTATION CONTROL DESIGN TESC INTRODUCTION The T. E. S. C. Plan for Washington Tech Center has been developed following the guidelines established within the 1990 King County Storm Drainage Manual. In general, the site will be drained in a north/south direction from a ridge across the building pad. There will be approximately 4 . 1 acres draining north and 2 . 4 acres draining south of the ridge. Storm water runoff will sheet flow to interceptor swales which then conveyed the storm water to a sedimentation pond. The sedimentation pond has been sized so that it can later be modified to the wetpond. This results in a sediment pond storage capacity which far exceeds the volume required by the 1990 King County manual . As a result of the increased pond volume, a significantly smaller volume of sediment will be discharged to the downstream channel. In the calculations it has been shown that the minimum intercep- tor swale section__has adequate capacity to convey the 10 year storm water runoff rate from the 4 . 1 acres area. Therefore the minimum swale section will have adequate capacity for all areas on-site. Also, since the flow velocity within the Swale will be approximately 0 . 9 fps it will not be necessary to install rock _ check dams for channel protection. Rock check dams will be installed at various locations to improve sediment removal. Filter fabric fence will be installed along the north, west and south sides of the project. There is a small off-site drainage area along the east property line which will be conveyed by swale around the work area. 91206/Eng 40-B BUSH, ROED & HITCHINGS, INC. JOB wt�s�1 Tiu CIVIL ENGINEERS & LAND SURVEYORS 2009 Minor Avenue East SHEET NO. OF Seattle.WA 98102 CALCULATED BY DATE �-_- r (206)323-4144 H (206) 323-7135 * Fax CHECKED BY DATE SCALE SEbt r✓i E►.JTAT I�� PoP..�p PEt2 5.4.4-Z {cc. C- ��PR� Z.zz 2•2Z IC = c. 15 FizakA Tt�,6LE 5.4.4 A LS = o.l� �!1-w� _ 7�3LE 5.t�.¢/3___�.��-� �ion ' .5� ---- o•� C V= l-O N0 6eezil.-0 Tie/3 AreE�7 = �� �� _ �•sic - �s r- - 7/ {p - 0 — \4,o 1 •O MwS LL2 ?50CF LIVE 570, E� 2.7 F•r lE 10.7 tin ef — — 510eA[� 8,b 7>EP VA of 5EZ_�cf/-1 =0,05 PFDDUCT 2D4.1 i*t LMets)251 iPww)=ACM 3 inc.GmW Nta 37/7!To Ow P OM TOL WE I MM-M BUSH, ROED & HITCHINGS, INC. JOB WA sL1 Tz Ce►� 2 CIVIL ENGINEERS & LAND SURVEYORS 2009 Minor Avenue East SHEET NO. OF Seattle,WA 98102 CALCULATED BY-- -� r_ (206) 323-4144DATE_ H (206) 323-7135 *Fax CHECKED BY DATE SCALE Q= I.49 N µ �� r1 Z n= c,o Z. �2 w%nc- n" w/ 2; I Si7Er � o ROU-) To Q Ua= M)Q . SwAo_r_- c�o.� Co�.sv�t' Rvr. o U)17-H I v`ZpGt T-{ w I L.L. NJO F�j OtJ S i� b E�Tl�l R�P Rip i s t�07 R�Qu r -p rn�-- 1tLrz ¢, r A R P P AD W 11� �E I�Sr: AT Pam- l rJ UET Av� �� McD�A.rl S-ca,.� Sim AAOUCi�i .$me�7Me7Sl:gSi,P10J[01®�rc ;rcen Mia]117"JObM 7'�U4-01!�Ff'a04i2Sa"iA0 X. BOND QUANTITIES WORK SHEET, RETENTION/DETENTION FACILITY SUMMARY r SHEET AND SKETCH,AND DECLARATION OF COVENANT jf + King County = Wi ldinp and Land Davelopmnt Division BOND guANTITIES WORKSHEET 1 =. �COXMCIAL/XULTI7AH1 +Y GROUP Page 1 of 2 I Data: I BALD Project No.: Project Name: i I Site Address: t i Fill in those item which pertain to this project and return to the Comercial/Multifamily Group - Site Development Review Unit. PUBLIC ROADWAY IMPROVEMENTS I PRIVATE ON-SITE IMPROVEMENTS I Unit Price Unit I Quantity Price I -.Uiantity Price A.C.Pavement . . . . . . . . . . S 8.00 SY I S I S i Cement Conc. Curb L Gutter . . . 9.00 LF I S I $ I Extruded Asphalt Curb . . . . . 2.50 LF ( S I S I Concrete Sidewalk . . . . . . . 9.00 LF I S I S I 6" pipe . . . . . . . . . . . . 7.50 LF I S I S I 8" pipe . . . . . . . . . . . . 10.00 LF I 2 ( S I 12" pipe . . . . . . . . . . . . 15.00 LF I S I S I 15" pipe . . . . . . . . . . . 16.00 LF I S I S I 18" pipe . . .. . . . . . . . . 20.00 LF I S I S i 24" pipe . . . . . . . . .. . . . 26.00 LF I S I S .� 36" pipe . . . ... . . . . . . . 30.00 LF I S I S I 48" pipe . . . . . . . . . . . . 50.00 LF I S I S I A" pipe . . . . . . . . . . . . 65.00 LF I S I I 72" pipe . . . . . . . . . . . . 80.GO LF I S I S Curb Inlet . . . . . . . . . . . 500.00 EA. ( S I S CS TYPE I L I-L . . . . . . . . 750.00 EA. I S I S I CS TYPE II - 48" . . . . . . . . 1400.00 EA. I S I S I CS TYPE II - 54" . . . . . . . . 2100.00_ EA. ( S I S I CS TYPE II - 72" . . . . . . . . 3400.00 EA. I S I S I CS TYPE II - 96" . . . . . . . . 4000.00 EA. I S I S I Restrictor/Separator 12" . . . . 450.00 EA. I S I S Restrictor/Separator 15" 500.00 EA. I S I S I Restrictor/Separator 18" 600.00 EA. I S I S I Restrictor/Separator 24" . . . . 750.00 EA. I S I $ Fencing (around pond) . . . . . 10.00 LF i $ I S I R i prap . . . . . . . . . . . . . 30.00 CY I S I S I Rockery, Gabion L ecology wall . 7.00 SF I S I S Concrete Retaining Mall . . . . 8.00 SF I S I S I Excavation for Pond . . . . . . 5.00 CY I S I S Infiltration Trench . . . . . . 15.00 LF I S I S Flow Spreader . . . . . . . . . 15.00 LF I $ I S I Trench Drain . . . . . . . . . . 15.00 LF I $ I S I Trash Rack . . . . . . . . . 100.00 EA. I S I S Detention Pipe7Riser . . . . . . 400.00 EA. I S I S S I S ( S I $ I ( S I S I I I I SUBTOTAL S I SUBTOTAL S I I I ( 1/90 BOND QUMMITIEB HORESHEET King Canty Wilding and Land Development Division Commercial/Hultifaily Group purge 2 of 2 EROSION/SEDIMENTATION ( CONTROL FACILITIES Unit — Price Unit ( Quantity Price Silt Fence . . . . . . . . . . . S 3.00 LF ( f Seed irq/Aulch . . . . . . . . . 3000.00 ACRE I S Temporary Pond . . . . . . . . . 5.00 CY I S Standpipe . . . . . . . . . . . 200.00 EA. I S CS Interim Protection . . . . . 25.DO EA. ( S Quarry Spell/Rip-rap . . . . . . 30.DO CY ( S Rock Construction Entrance . . . 300.00 EA. ( S Pipe ( inch dia.) . . . . . . LF I S - ( SUBTOTAL S Signature: I Telephone No.: Firm Name: The following information will be completed by the King County Site Development Review Unit. PUBLIC ROADWAY IMPROVEMENTS: S PRIVATE ON-SITE IMPROVEMENTS: S EROSION/SEDIMENTATION CONTROL S SUBTOTAL S 20% CONTINGENCY S I ( I TOTAL BOND A.MaYNT S RIGHT-OF-UA Y BOND S 08:SONOSHEE.VPF 11/25/1989 1/90 '' � BOND QUMMITIES PRICE SCHEDULE King County Building and land Development 0ivision SUDIVISION PRODUCTS SECTION r The unit prices shown on this schedule are recnamended minimum prices consultants shall follow when complet- ing the BONO OUANTITIES WORKSHEET for engineering plan submittals. Unit prices shown reflect material and instalation costs averaged from bid quantities compiled by the Department of Public Yorks. Unit prices may not deviate from this schedule unless prior approval is obtained from the Subdivision Products Section. Unit Price Units Unit MISC.: ROAD CONSTRUCTION: Price Units Rip Rap Outfall Protection. 17.00 CY Clearing t Grubbing LS Access Road/Bollards. . . . 500.00 LS Excavation L Embankment $5.00 CY Fencing (around pond) . . . 9.00 LF A.C. Pavement & Rock Base 10.00 SY Infiltration Trench . . . . 15.00 LF Cement Conc. Curb L Gutter. 6.00 LF Flow Spreader . . . . . . . 15.00 LF Extruded Asphalt Curb 4.-3 LF Trash Racks . . . . . . . . 200.00 LF Concrete Sidewalk 9.00 LF DRAINAGE PIPE: RETAINING WALLS b STRUCTURES: 12" Culvert . . . . . 15.00 LF Retaining Walls . . . . . . LS 18" Culvert . . . . . . . . 20.00 LF Bridges . . . . . . . . . LS 24■ Culvert . . . . . 26.00 LF Rockery Facia Walls . . . . 5.00 SF 36" Culvert . . . . . . 40.00 LF 48" Culvert . . . . . . 50.00 LF TRAFFIC CHANNELIZATICN: 54" Culvert . . . . . . . . 60.DO LF Signalization . . . . . . . LS 60" Culvert . . . . . . . . 65.00 LF Channelization. . . . . . . LS 72" Culvert . . . . . . . . 80.00 LF SITE STABLIZATION/EROSION CONTROL: CATCH BASINS: Rock Construction Entrance. 300.00 ea. INLET b Grate . . . . . 500.00 ea. Seeding/Mulch . . . . . . . 3000.00 ACRE CS TYPE I b Grate . . . . . 750.00 ea. Silt Fence. . . . . . 4.00 LF CS TYPE II 48" L Grate. . . 1400.00 ea. Netting/Jute Mesh . . . . . 5.00 SY C8 TYPE 11 54" b Grate. 1600.00 ea. Sediment Pond Standpipe 200.00 ea. CS TYPE 11 72" 3 Grate. . . 3400.00 ea. CH TYPE II 96" L Grate. . . 4000.00 ea. Riprap (quarry spalls). 17.00 CY RETENTION/DETENTION CONTROL: Pond Excavation L Spillway. .5.00 CY Restrictor/Separator 120. 450.00 ea. Restrictor/Separator 18". 600.00 ea. Restrictor/Separator 24". 750.00 ea. 1/'90 `-KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL " RETENTIOWDETENTION SUMMARY SHEET j Development Date Location ENGINEER DEVELOPER Name Name Firm Firm Address Address Phone Phone • Developed Site _acres Number of Lots r • Number of Detention Facilities On Site • Detention provided in regional facility ❑ Regional FacTrty location • No detention required ❑ Acceptable receiving waters • Downstream Drainage Basins Immediate Major Basin Basin A Basin B Basin C Basin D TOTAL INDIVIDUAL BASIN Drainage Basin(s) A B C D Onsite Area Offsite Area Type of Storage Facility Live Storage Volume Predeveloped Runoff Rate 2 year 10 year Postdeveloped Runoff Rate 100 year 2 year 10 year Developed O 100 year Type of Restriction Size of Orifice/Restriction Ord'rce/Restriction No.1 No.2 No.3 No.4 No.5 1/90 1' ;- EKING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL r1 � RETENTION/DETENTION SUMMARY SHEET ✓�" Development Date Location ENGINEER DEVELOPER Name Name Firm Firm Address Address Phone Phone • Developed Site acres Number of Lots • Number of Detention FaaTities On Site • Detention provided in regional facility ❑ Regional Facility location • No detention required ❑ Acceptable receiving waters • Downstream Drainage Basins Immediate Major Basin Basin A Basin B Basin C Basin D TOTAL INDMDUAL BASIN Drainage Basin(s) A B C D Onsite Area Offsite Area Type of Storage Facility Live Storage Volume Predeveloped Runoff Rate 2 year k 10 year Postdeveloped Runoff Rate 100 year 2 year 10 year Developed Q 100 year Type of Restriction Size of Oritice/Restricbon Ordice/Restriction No.1 No2 No.3 No.4 No.5 eon __ ';'���4V��_ -r_.��-� .......-•. '. __ ..YL�� .�_���. -.-�.� . .. .. .. ...v.�r --_�___. �. _���_-_-___.� .... ...ram DECLARATION OF COVENANT ASSOCIATED WITH MULTI-FAMILY/COMMERCIAL RETENTION/DETENTION FACILITY Declarati-on of Covenant , " i.n consideration of the approval of King County of a permit for 'application No .. relating to real property legally . described as follows: The undersigned as owner (s) covenants and agrees that : 1 . All necessary easements will be dedicated to King County for access to Inspect , maintain or repair the facilities in conformity with King County Code Section 9 .04. 120. 2. If King County determines that maintenance or repair work Is required to be done to the retention/detention facility existing on the above-described property, the director of the department of public works shall give the person to whom the permit was Issued pursuant to K.C.C. 9 .04 .030, the owner of the property within which the drainage facility Is located, the person or agent ' in control of said property notice of the specific maintenance and/or repair required . The director of the department of public works shall set a reasonable time In which such work Is to be completed by the titleholders who were given notice. If the above required maintenance and/or repair is not. completed within the time set by the director , the . county may perform the required maintenance and/or repair . Written notice will be sent to the titleholders stating the county ' s Intention to perform such maintenance. Maintenance work will not commence until at least seven days after such notice Is malted . 3 . If at any time King County reasonably determines that any existing retention/detention system creates any of the conditions listed In K.C.C . 9 .04 .030 and herein Incorporated by reference, the director may take measures specified therein . 4. The titleholders shall assume all responsibility for the cost of any maintenance and for repalrs to the retention/ detention facility . Such responsibility shall Include reimburse- ment to the county within 30 days of the receipt of the Invoice for any such work performed. Overdue payments will require payment of Interest at the current legal :rate for Iiquldated Judgments . If legal action ensues , any costs or fees incurred by the county wlll be borne by the partles responsible for said reimbursements . This covenant benefits all citizens of King County , touches and concerns the land and shall run with the land and be binding on all heirs , successors and assigns . 1 of 2 1/90 These covenants are Intended to protect the value and desirability of the real property described tabove, and to benefit all the citizens of King County. they shall run with the land and be binding on all parties having or acquiring from: or their successors any right, title or Interest In the property or any part thereof , as well as their heirs, successors and assigns. They shall Inure to the benefit of each present or future successor in Interest of said property or any part thereof , or Interest therein , and to the benefit of all the citizens of King County . " Owner Owner STATE- OF WASHINGTON) COUNTY OF KING )ss . On this day personally appeared before me: to -me known ,.� to be the IndIvIduaI (s) described In and who executed the within and foregoing Instrument and acknowledged that they signed the same as their free and voluntary act and deed , for the uses and purposes therein stated . Given under my hand and official seal this day of 19 NOTARY PUBLIC In and for the State of Washington , residing at 1 2 of 2 1/90 M. MAINTENANCE AND OPERATIONS MANUAL r i KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL KING COUNTY, WASHINGTON SURFACE WATER DESIGN MANUAL APPENDIX A MAINTENANCE REQUIREMENTS FOR PRIVATELY MAINTAINED DRAINAGE FACILITIES Section No. Subject 1 Ponds 2 infiltration 3 Closed Detention Systems 4 Control Structure0ow Restrictor 5 Catch Basins 6 Debris Barriers 7 Energy Dlssapators 8 Fencing 9 Gates - 10 Conveyanca Systems 11 Grounds 12 Access Roads/Easements 1/90 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL RETENTION/DETENTION SUMMARY SHEET SKETCH All retention/delention summary sheets must include a sketch prepared to the following criteria: 1. Heading for the drawings should be located at the top of the sketch, pre- ferably at the top right hand corner. The heading should contain: - North arrow point up or to the left - D94 - Plat name or Short Plat number - Date drawn or updated - Address (nearest the site) - Thanas Brothers page and grid number - Maintenance Division number 2. Label CB's and MH's with the plan and profile designation. Label the control structrue in writing or abbreviate with C.S. or O.W.S. 3. Pipes_ - indicate: - Pipe size - Pipe lenghth - Flow direction - Use a single, heavyweight line _ Example: BOO',�' _r,rR�►� Tanks - use a double, heavyweight line and indicate the size Example: '�-•: '12' 5. Access Roads - Outline the limits of the road - Fill the outline with dots if the road is gravel. Label in writing if it is another surface 6. Other Standard Symbols: - Bollards �.:• seas - Rip Rap � - Fences x X--- - Ditches --o o O 7. Label trash racks in writing. Exa.iTple: }rosh rack z— 8. Label all streets with the actual street sign designation. If you don't know the actual street name, consult the plat map. 9. Include easemnts and lot lines or tract limits when possible. 10. Arrange all the labeling or writing to read from left to right or from bottom to top with reference to a properly oriented heading. Indicate driveways or features that may impact our access, maintenance or replacement. RD-2 1/9 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN :MANUAL MAINTENANCE REQUIREMENTS FOR PRIVATELY :MAINTAINED DRAINAGE FACILITIES f NO. 1 - PONDS MafntlnaflCe CoM tfons When Maintenance Reaufta Expected Component detect is Heeded When Maintenance Is Performed General Trash&Debris Any trash and debris which exceed 1 Trash and debris cleared from site. cubic foot per 1000 square feet (this Is about equal to the amount of trash it would take to fill up one standard size office garbage can). In general, there should be no visual evidence of dumping. Poisonous Any poisonous vegetation which may No danger of poisonous vegetation where Vegetation constitute a hazard to County personnel County personnel or the public might or the public. Examples of poisonous normally be. (Coordination with vegetatio.Anclude: tansy ragwort, poison Seattle/}Gag County Health Department) oak,stinging nettles,devils club. Pollution Oil,gasoline,or other contaminants of No contaminants present other than a one gallon or more or any amount found surface film. (Coordination with that could: 1)cause damage to plant, Seattle/fling County Health Department) animal,or marine life; 2) constitute a fire hazard; or 3) be flushed downstream during rain storms. llomowed Grass/ If facility is located in private residential When mowing is needed,grass/ground Ground Cover area,mowing is needed when grass cover should be mowed to 2 Inches In exceeds 18 inches in height. in other height. areas,the general policy is to make the pond site match adjacent ground cover �. and terrain as long as there is no interference with the function of the facility. Rodent toles Any evidence of rodent holes if facility is Rodents destroyed and dam or berm acting as a dam or berm,or any evidence repaired. (Coordination with Seattle/ of water piping through dam or berm via I(ing County Health Department) rodent holes. insects When insects such as wasps and hornets Insects destroyed it removed from site. interfere with maintenance activities. Tree Growth Tree growth does not allow maintenance Trees do not hinder maintenance access or interferes with maintenance activities. Selectively cultivate trees such activity (i.s.,slope mowing, silt removal, as alders for firewood. vactoring or equipment movements). if trees are not interfering with access, leave trees alone. Side Slopes of Erosion Eroded damage over 2 inches deep Slopes should be stabilized by using Pond where cause of damage is still present or appropriate erosion control measure(s): where there is potential for continued e.g.,rock reinforcement, planting of erosion. grass, compaction. Storage Area Sediment Accumulated sediment that exceeds 1C% Sediment cleaned out to designed pond of the designed pond depth. shape and depth; pond reseeded if necessary to control erosion. Pond Dikes Settlements Any part of dike which has settled 4 Dike should be built back to the design inches lower than the design elevation. elevation. Emergency Rock Missing Only one layer of rock exists above native Replace rocks to design standards. Overflow/Spillway soil in area five square feet or larger, or any exposure of native soil. A-1 1/90 {ING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL M0. 2 - INFILTRATION Results Expected ntenai Co Defect Is�ndtfO� beum ns When Mainnoe 1AMen Ma4rtenance is Performed ed General Trash 3 Debris See'Ponds'Standard No. 1 See'Ponds Standard No. 1 Poisonous See'Ponds'Standard No. 1 See'Ponds Standard No. 1 Vegetation Pollution See'Ponds'Standard No. 1 See'Ponds Standard No. 1 Unrnowed Grass/ See'Ponds'Standard No. 1 See'Ponds Standard No. 1 Ground Cover Rodent Holes See'Ponds' Standard No. 1 See'Ponds Standard No. 1 Insects See'Ponds'Standard No. 1 See'Ponds Standard No. 1 Storage Area Sediment A percolation test pit or test of facility Sediment h removed and/or facility is indicates facility Is only working at 90%of cleaned so that infiltradon system works its designed capabilities. according to design. Sheet Cover Sheet cover Is visible and has more than Sheet cover repaired or replaced. (If Applicable) three 1/4-Inch holes in it Sump Filed Y th Arty sediment and debris filling vault to Clean out sump to design depth. Sediment and 10%of depth from sump bottom to Debris(if bottom of outlet pipe or obstructing flow Applicable) Into the connector pipe. Filter Bags Filled with Sediment and debris fill bag more than Replace filter bag or redesign system. Sediment and 1/2 full. Debris jck Filters Sediment and By visual inspection little or no water Popiace gravel in rock filter. Debris flows through filter during heavy rain storms. A-2 1/'90 RING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL NO. 3 - CLOSED DETENTION SYSTEMS (PIPES/TANKS) Mtalntenance Conditions When M&Ln1onanco Results Expected Component Defect Is Needed When maintenance is Performed Storage Area Plugged Air Vents One-haft of the cross section of a vent Is Vents free of debris and sediment. blocked at any point with debris and sediment. Debris and Accumulated sediment depth exceeds All sediment and debris removed from Sediment 10%of the diameter of the storage area storage area. for 1/2 length of storage vault or any point depth exceeds 15%of diametar. Example: 724nch storage tank would require cleaning when sediment reaches depth of T inches for more than 1/2 length of tank. Joints Between Any crack allowing material to be All joints between tank/pipe sections are Tank/Pipe Section transported Into facility. sealed. Tank/Pipe Bent Any part of tank/pipe is bent out of shape Tank/pipe repaired o<replaced to design. Out of Shape more than 10%of its design shape. Manhole Cover not in Place Cover is missing or only partially in place. Manhole is dosed. Any open manhole requires maintenance. Loaing Mechanism cannot be opened by one Mechanism opens with proper tools. Mechanism Not maintenance person with proper toots. Working Bolts into frame have less than 1/2 inch of thread (may not apply to self-locking lids). - Cover Difficult to One maintenance person cannot remove Cover can be removed and reinstalled by Remove lid after applying 80 pounds of lift. Intent one maintenance person. is to keep cover from sealing off access to maintenance. Ladder Rungs Kng County Safety Office and/or ladder meets design standards and Unsafe maintenance person judges that ladder is allows maintenance persons safe access. unsafe due to missing rungs, misalignment,rust,or cracks. Catch Basins See'Catch Basins'Standard No.5 See'Catch Basins'Standard No.5 1/90 A-3 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL SOO. 4 - CONTROL STRUCTURE/FLOW RESTRiCTOR ' 1 MsJntananoa r4nditlons When Malnbenance Reeutts Expected Convonant Defeo to Needed When hWntenance is Performed General Trash and Dobda Distance between debris build-up and Ali trash and debris removed. (includes bottom of orifice plate Is less than 1-1/2 Sed runt) feet Structural Damage Structure Is not securely attached to Sbuch"securely attached to wall and manhoie wall and outlet pipe structure outlet pipe. should support at least 1.000 pounds of up or down pressure. Structure Is not in upright position (allow Structure in correct position. up to 10%from plumb). Connections to outlet pipe are not Connections to outlet pipe are watertight; watertight and show signs of rust structure repaired or replaced and works as designed. Any holes—other than designed holes— Structure has no holes other than In the structure. designed holes. peanut Gate Damaged or peanut gate Is not watertight or is Gate Is watertight and works as designed. Missing missing. Gate cannot be moved up and down by Gate moves up and down easily and is one maintenance person. watertight Chain leading to gate is missing or Chain Is in place and works as designed. damaged. Gate is rusted over 50%of its surface Gate is repaired or replaced to meet area, design standards. .,ice Plate Damaged or Control device is not working property Plate Is in place and works as designed. MWssing due to missing,out of place,or bent orifice plate. Obstructions Any trash,debris,sediment,or vegetation Plate is free of all obstructions and works blocking the plate, as designed. Overflow Pipe Obstructions Any trash or'debris blocking (or having Pipe is free of all obstructions and works the potential of blocking)the overflow as designed. pipe. Manhole See'posed Detention Systems'Standard See'Closed Detention Systems' Standard No.3. No.3. Catch Basin See'Catch Basins' Standard No.5. See'Catch Basins'Standard No.5. A-4 1/'90 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL NO. 5 - CATCH BASINS 1Aa>i> lance Cor+dttfons When "intenana Resufts erected Compon"t Dehet Is Heeded When hialatenarxa Is Performed Geri" Trash&Debris Trash or debris of more than 1/2 cubic No trash or debris located immediately in (lndudes foot which Is located immediately in front front of catch basin opening. Sediment) of the catch basin opening or is blocking capacity of basin by more than 10%. Trash or debris On the basin)tat No trash or debris in the catch basin. exceeds 1/3 the depth from the bottom Of basin to invert of the lowest pipe into or out of the basin. Trash or debris in any Inlet or outlet pipe Inlet and outlet pipes free of trash or blocking more than 1/3 of its height debris. Dead animals or vegetation that could No dead animals or vegetation present generate odors that would cause within the catch basin. complaints or dangerous gases (e.g., methane). Deposits of garbage exceeding 1 cubic No condition present which would attract foot in volume. or support the breeding of insects or rodents. Structural Damage Comer of frame extends more than 3/4 Frame is even with curb. to Frame and/or inch past curb face into the street(f Top Slab applicable). Top slab has holes larger than 2 square Top slab is free of holes and cracks. Inches or cracks wider than 1/4 inch (intent is to make sure all material is running into the basin). Frame not sitting flush on top slab,i.e., Frame is sitting flush on top slab. separation of more than 3/4 inch of the frame from the top slab. Cracks in Basin Cracks wider than 1/2 Inch and longer Basin replaced or repaired to design Walls/Bottom than 3 feet,any evidence of soil particles standards. entering catch basin through cracks, or maintenance person judges that structure Is unsound. Cracks wider than 1/2 inch and longer No cracks more than 1/4 inch wide at the than 1 foot at the joint of any inlet/outlet joint of inlet/outlet pipe. pipe or any evidence of soil particles entering catch basin through cracks. Settlement/ Basin has settled more than 1 inch or has Basin replaced or repaired to design Wsallgnment rotated more than 2 inches out of standards. alignment. Fire Hazard Presence of chemicals such as natural No flammable chemicals present. gas,oil, and gasoline. Vegetation Vegetation growing across and blocking No vegetation blocking opening to basin. more than 10%of the basin opening. Vegetation growing in inlet/outlet pipe No vegetation or root growth present joints that is more than six inches tali and less than six inches apart. Pollution Nonflammable chemicals of more than No pollution present other than surface i/2 cubic foot per three feet of basin film. length. A-5 1/90 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL "O. 5 - CATCH BASINS (Continued) AAakttenar�ce l Ccadftlons When Ma4nse.. Resi+tts EVeeted , Con+por»rst D~ Is deeded MMert Maintenanee Is Performed Catch Basin Cover Cover Not in Pleoe Cover is missing or only partially In place. Catch basin cover Is dosed. Any open catcfn basin requires mai ntenanoe. Locking Mechanism cannot be opened by one Mechanism opens with proper tools. Mechanism Not maintenance person with proper tools. Working Botts into frame have less than 1/2 inch of thread. Cover Difficult to One maintenance person cannot remove Cover can be removed by one Remove lid after applying 80 Ibs.of lift; Intent Is maintenance person. keep cover from sealing off access to maintenance. Ladder Ladder Rungs Ladder Is unsafe due to missing rungs, ladder meets design standards and l)nsafe misalignment,rust,cracks,or sharp allows maintenance person safe access edges. Metal Grates Grate with opening wider than 7/8 inch. Grate openings meet design standards. (f applicable) Trash and Debris Trash and debris the Is bk>ck(ng more Grate free of trash and debris. than 20%of grate surface. Damaged or Grade missing or broken members)of Grate is in place and meets design Missing the grate. standards. r A-6 1/90 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL NO. 6 - DEBRIS BARRIERS (e.g. TmSh Rack3) Malnanane. C;Dedpfons Yvw UWnwwnoe Rosa ee Expected coaworant 0Mieot it M..ded when Yaksw+ance Is Performed Ger»rst Trash and Debris Trash or debris that is plugging more Bursar dear to receive capacity flow.. than lox of ttw openings in the barrier. Mehl Damaged/Wssing Bars an bent out d shape more than 3 Bars in place with no bends more than Bars irx Ms. 3/4 inch. Bars am missing or entire barrier Is Bars In place ace w*V to design. 1,98sk0• Bars am loose and rust Is caning 50% Fiapsk or replace barrier to design deterioration to any part of barrier. standards. A-7 1/90 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL ' 1. 7 - ENERGY DISSIPATORS alr;t«,anoe; Condtdons When Makrbenance R"u to Expeclech Compon«+t Defect Is }deeded When Maintenance is PKiomwd Rock Pad Missing or Moved Only one laysr of rock axtsts above native Replace rocks to design standard. Hods will in area five square hat or larger,cc any exposure of native soil. Dispersion Trench Pipe Plugged with Accxunuiated sediment that sxceeds 20% Pipe cleaned/flushed so tt st it matches Sediment of the design depth. design- Not Discharging Visual evidence of water discharging at Trench must be redesigned or rebuOt to Water Property concentrated points along trench (normal standard. condition is a'~fkW of water along trench). Intent is to prevent erosion damage. pw*xations Over 1/2 of perforations In pipe are Clean or replace perforated pipe. Plugged plugged with debris and sediment. 1fYater Flows Out Maintenance person observes water Facility must be rebuitt or redesigned to Top of'Distributor' flowing out during any storm less than standards. Catch Basin the design storm a It is causing or appears likely to cause damage. Pecelving Area Water in receiving area Is causing or has No danger of landslides. Ow-Saturated potential of causing iandslkie problems. Intemal• _ ..mhole/Chamber Wom or Damaged Structure dissipating flow deteriorates to Replace structure to design standards. Posts,Baffles, 1/2 or original size or any concentrated Sides of Chamber wom spot exceeding one square foot which would make structure unsound. Other Defects See'Catch Basins'Standard No.5 See'Catch Basins'Standard No.5 - 1/90 A-8 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL _ NO. 8 - FENCING r iRairrOeeanoe Coadhions*When Maln+.eanee Results Expected Component Defect is Needed wtwn Makitona ice is P*n%wn ed General Missing or Broken My defect In the fence that permits easy Puts fn place to provide adequate Parts entry to a facility. security. Parts broken or missing. Broken or missing parts replaced. Erosion Erosion more than 4 Inches high and 12- No opening under the fence that exceeds 18 inches wide permitting an opening 4 Inches in height under a fence. Win Fences Damaged Parts Posts out of plumb more than 8 inches. Poets plumb to within 1-1/2 lndws. Top rails bent more than 8 inches. Top rig free of bends greater than 1 inch. Any part of fence (including pasts,top Fence is aligned and meets design - ralls,and fabric)more than 1 foot out of standards. design alignment Missing or loose tension wire. Tension wire in place and holding fabric Missing or loose barged wire that is Barbed wire in place with lea than 3/4- sagging more than 2-1/2 inches between inch sag between posts. Posts- Extension arm missing,broken,or bent Extension arm In place with no bends out of shape more than 1-1/2 inches. larger than 3/4 inch. Deteriorated Paint- Part or parts that have a rusting or sing Structurally adequate posts or parts with or Protective condition that has affected structural a uniform protective coating. Coating adequacy. Openings in Fabric Openings in fabric are such that an 8- No openings in fabric. inch-diameter ball could fit through. A-9 1190 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL 'O. 9 - GATES nAalnts um,c CondNfom when Mai,wwnce Reamed Exp.eted Component Defect Is Needed Mown MskdwAnoe is perkcnwd General Damaged or L41sping.qats or offing devioes. Gates and bddng devious in place. weim MaTbus IN or nfesing hinges such that Oats Pinged Inted and tubed. Gate to woeidng dennot be easily opened and dosed by a lteely. mafetenance person. Gate Is out of pkxnb rnon flan 6 kx*m Gate Is aligned and vertical. and aim flan 1 foot out of design aligrvrent Mseirp stretcher bar.sfretdw bands, Shetcter bar,bands,and ties in place. and ties. Openings In Fabric See'Fencng'Standard No.8 See'Fencing'StwWand No.8 A-10 1190