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Home My WebLink About02915 - Technical Information Report � � � N TECHNICAL INFORMATION REPORT Puget Sound Electrical Apprenticeship and Training Program Renton, Washington March 19, 2001 Our Job No. 7976 ti p. G1�tr �''P`�°�W�y o� q 1 '�,p ,Q 23975�p �a` O FGISTER �� SS1pNAl�G ?.L�'(� Gt"�q� Q'� �► S� ��iREs:s-�a o � • ` CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES �� 1SZ15 72ND AVENUE SOUTH, KENT,WA 98032 . (425)251-6222 . (425)251-8782 FAx °s�,G ��V�� r www.barghausen.com <Ti ti'��G�N�6� Z 9/� TECHNICAL INFORMATION REPORT Puget Sound Electrical Apprenticeship and Training Program Renton, Washington , � March 19 2001 , Our Job No. 7976 4� �R �' w P o¢ � .:;�,-,;��,�:^.:. P,� � �� ..�'�:d �`= l �tipr•� � . A �23975�p � _. <-r�.��°.�=:� � Q�'� �� S1pNA1.�G '��.0� Q`�GHA�j�� (�i_a GI� � y CML ENGfNEERiNG,LAND PtANMNG,SURVEI(1NG, ENVIRONMENTAL SERVICES n f � 1821�72tvo AvENUE SOtITH,KEN7,WA 98032 . (425)251-&222 . (4251251$782 FAX °s� .r www.barghausen.com y�c��N� TABLE OF CONTENTS I. PROJECT OVERVIEW A. Technical Information Report Worksheet II. PRELIMINARY CONDITIONS SUMMARY III. OFF-SITE ANALYSIS A. Upstream Drainage Analysis B. Downstream Drainage Analysis IV. DETENTION VAULT ANALYSIS AND DESIGN A. Detention Vault Calculations B. Pre-Developed and Post-Developed Basin Area Maps C. Wet Vault Calculations V. CONVEYANCE SYSTEM ANALYSIS AND DESIGN A. Piped Conveyance Calculations B. Conveyance Area Map C. Miscellaneous Conveyance Calculations for Overflow Spillways, Stand Pipes,etc. VI. SPECIAL REPORTS AND ST'UDIES VII. BASIN AND COMMUNITY PLAN AREAS VII3. OTI-�R PERMITS IX. EROSION/SEDIMENTATION CONTROL DESIGN X. ADDITIONAL DdCUMENTS A. Retention/DetPntion Facility Summary Sheet and Sketch XI. MAINTENANCE AND OPERATIONS MANUAL 7976.003[�JED/mm/knj � � I � � � � � N . � � � � � � ~ I. PROJECT OVERVIEW The proposed projed is located in the southwest quartex of Sectionl8,Township 23 North,Range S East, I Willamette Meridian,within the city of Renton,Washington. More sp�cally,the site is located along �' S.W. 7th Street near the intersection with Thomas Avenue. The site is approximately 2.21 acres in size, and is triangulaz in shape with approximately 260 feet of frontage along S.W. 7th Street. The site is generally flat,sloping genfly toward the north oorner. The site is bounded along the north and west sides by existing Burlington Northern Ra�7road right-of-way. The existing vegetation on site consists of brush and low growing ground cover. The site is cuirenfly not being used,and contains no eaisting structures. The proposal for this parcel of land is to construct a new parking lot contaiuing 200 parldng stalls. This parking lot will be used by an adjacent building that is being eapanded and is requiring additional parking. The stormwater runoff created from this parking lot addition w�l be handled using a piped conveyance system Once stormwater enters this conveyance system, it will then be conveyed to a detention vault that is located on site. This underground vault will provide water quality and detention, releasing the stormwater at pre-developed rates. Please see Section 1V of this report for further deta�s regazding the storm system and calculations. 7976.003[DIDfmm/lcn] _ A. TEC�INICAL INFORMATION REPORT WORKSHEET King County Department of Development and Environmentai Services TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Fart 1 PROJECT OWNER AN� Part 2 PROJEE��.Q��iOC`�/��.: PROJECT ENfINEER _ DESCRIP�fOI�., ': � � � - -�:�r�..F.E.. ��.�� Project Owner Puqet Sound Electrical Project Name Puqet Sound Electricai A�prenticeship and Traininq Trust Apprenticeship and Trainin4 Trust Address 5700-6th Avenue South. Suite 200 Location Seattle. WA 98108 Township 23N Phone (2061763-7755 Range 5E Project Engineer Hal P. Grubb. P.E. Section 18 Company Barghausen Consultinq EnQineers. Inc. Project Size 2.1 acres Address/Phone 18215-72nd Avenue South Kent, Washington 98032 Upstream Drainage Basin Size 0 acres (4251251-6222 Part 3 TYPE OF PERMIT Part 4 OTHER REVIEWS AND PERMITS APPUCATION ❑ Subdivision HPA ❑ DFW HPA ❑ Shoreline Management ❑ Short Subdivision ❑ COE 404 ❑ Rockery ■ Grading ❑ DOE Dam Safety � Structural Vaults ❑ Commercial ❑ FEMA Floodplain ❑ Other ❑ Other ❑ COE Wetlands Part 5 SITE COMMUNITY AND DRAINAGE BASIN _ Community Green River Vallev Drainage Basin Green River 7976.003[DID/mm/lm] �r�f4 V� �i�lJl'lf"1f'7�'lC/��{1��./EJt� b �� 1�:- 3` _ �t � � .. . . � . �_ Q_. �- _, .,�.,.: � _ _-L �'..�a��:t�- , r ❑ River 0 Floodplain ❑ Stream ❑ Wetlands ❑ Critical Stream Reach ❑ Seeps/Springs ■ Depressions ❑ High Groundwater Table ❑ Lake ❑ Groundwater Recharge ❑ Steep Slopes ❑ Other Part 7 SOILS Soil Type Slopes Erosion Potential Erosive Velocities ❑Additional Sheets Attached Part 8 DEVELOPMENT LIMITATIONS REFERENCE LIMITATION/SITE CONSTRAINT ❑ ❑ ❑ ❑ ❑Additional Sheets Attached Part 9 ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION AFTER CONSTRUCTION ❑ Sedimentation Facilities ■ Stabilize Exposed Surface ■ Stabilized construction Entrance ■ Remove and Restore Temporary ESC ■ Perimeter Runoff control Facilities ❑ Clearing and Grading Restrictions ■ Clean and Remove all Silt and Debris � Cover Practices ■ Ensure Operation of Permanent Facilities ■ Construction Sequence ❑ Flag Limits of SAO and open space , ❑ Other preservation areas ❑ Other ' 7976.003[DID/mm/kn) . ParC 10 SURFAEE WAT�R�SY'gT��[` . ..,, � `'� y �`� ��- . .. ._. _:< , - . , ;: .:� ❑ Grass Lined Channel ❑ Tank ❑ Infiltration Method of Analysis � Pipe System � Vault ❑ Depression SBUH CompensatioNMitigation 0 Open Channel ❑ Energy Dissipater ❑ Flow Dispersal of Eliminated Site Storage 0 Dry Pond ❑ Wetland ❑ Waiver ■ Wet Vauft ❑ Stream ❑ Regional Detention Brief Description of System Operation Stormwater controlled bv catch basins and conveved via pipes to underground vault for detention and water qualitv. Facility Related Site Limitations Reference Facility Limitation Part 11 STRUCTURAL ANALYSIS Part 12 EASEMENTS/TRACTS ❑ Cast in Place Vault ❑ Drainage Easement ❑ Retaining Wall ❑ Access Easement 0 Rockery>4' High ❑ Native Growth Protection Easement ❑ Structural on Steep Slope ❑ Tract ❑ Other ❑ Other Part 13 SIGNATURE OF PROFESSIONAL ENGINEER I or a civil engineer under by supervision have visited the site. Actual site conditions as observed were incorporated into this worksheet and the attachments. To the best of my knowledge the information provided here is cura� . I% 3• �' �� Signed/Date 7976.003[DED/mm/kn] R x - . �,� } . .. _ • ;_ . . . . .. s� < ��, _ _. . .s . �'�� i'r�� Pr .� 4{ � . . . '� _ .. C Y.. 3''e'Ar2 . ,. . - .Y�.� . :ji. � ' �.t ... y ef.3�'�.� . . "' �. � � .`.�'. . . . . � . . . . . . -.1:. - . II. PRELIMINARY CONDITIONS SLT�VIMARY II. PRELIMINARY CONDITIONS SUMMARY There are no conditions for this project. 7976.003[DID/mm/kn] � � C/1 � � Z d� W E-+ � � � � � O � A. UPSTREAA-i DRAINAGE ANALYSI� The existing topography around the site is such that the site receives very little upstream drainage. As previously mentioned,the site is bounded on the north and west sides by an existing railroad, which sits higher in elevation than the subject property. However, there is only a small amount of area between the site and the existing railroad tracl� that actually drains onto the subject property. The adjacent parcel to the east is currently developed and contains all stormwater runoff, with the exception of a small portion at the north side along the existing railroad tracks. Along the south side of the subject property is S.W. 7th Street, which is developed and has storm drainage system that contains all stormwater runoff. B. DOWNSTREAM DRAINAGE ANALYSIS The e�sting topography of the site is such that there is no downstream clrainage system. Currently, the stormwater appears to intiltrate on site. If the stormwater was to pond on site, it would eventually overflow at the southwest corner of the site (which is the lowest elevation along the boundary)into the existing storm system in S.W. 7th Avenue. Stormwater that is collected on site will be detained and treated prior to being released into an existing 60-inch concrete storm line within S.W. 7th Street. We are currently in the process of obtaining specific information about ttus downstream system. Once this information is available, it will be included within this report. 797<,.(i[i3 [DED/u,m/I:ii] IV. DE'i'ENri,iUN VAULrt' ANALYSIS ANll DESI(sN i 1V. DETEitiTlO\ VAUL'I'r1\�L��S1S AND llES1G1i � Stortn drainage that will be produced by the new parking lot will be controlled and conveyed via underground pipes to an underground detention vault located on site adjacent to S.W. 7th Street. This underground vault will provide the re�uired water quality treatment and detention. Mare specitically, this system has been sized using the 1990 King County Surface Water Design Manual. The enclosed calculations show that the system has been designed to detain the 2-year post-developed storm while releasing the 2-year pre-de��e.loped storm,and to detain the 10-year post-developed stortn while releasing the 10-year pre-developed storm, along with a volume increase of 30 percent. Calculations have also been provided to verify that the 100-year post-developed storm event will be adequately conveyed through the proposed system. The water quality portion of this vault has also been sized using the same manual. The proposed project will create greater than 1 acre of new impervious area subject to vehicular trattic. Typically, a bioswale along with a wet pond is required;ho«�ever,with the proposed layout,a bioswale is not feasible. We are proposing an increase in the wet pool volume to compensate for not providing a bioswale. This increase is 1.5 times the required volume. We had a similar situation on a recent City of Renton project that was approved. Please see the enclosed calculations for fm-ther details. Based on U.S. Department of Agriculture maps,the soils classification for this site is Wo (Woodinville silt loam). For the drainage calculations,this converts to a hydrologic group"D." 7`�76.003[DEll/iiuiJl:�i] Hpr �b U1 12: 47p p . 6 �t�11�,+4�p �� ,� 4/26/01 12 : 48:�3 am Shareware Release page 1 PSEA&'xP DETENTION VAULT CALCN FZLE No. 7976-VLT DASIN �UMMARY BA�YN ID: A1 NAME: 2YR P�E-DEV SBUH METHODOLOGY TOTAL AREA. . . . . . . : 2 .21 ACres BASEFLOWS: 0 . 00 cfs RAINFAI�L TYPE. . . . : KC24HR PERV IMF PRECIPITAT20N. . . . : 2 . 00 inches AREA. . : 2 .21 Acres 0 .00 Acres TIME INTERVAL. . . . : �0 . 00 mitl CN. . . . : 86. 00 0.00 TC. . . . : 64 .39 min 0.00 min ABSTRACTZON COEFF: 0 .20 TcReach - Sheet L: 300 . 00 ns:0 .2400 p2yr: 2 .00 s: 0. 0079 TcReach - Shallow L: 80. 00 kS:11 . 00 s:0 .0079 PEAK RATE: 0. 19 cfs VOL: 0.16 Ac-f� TIME: 500 min HASIN ID: A2 NAME: IOYR PRE-DEV SBUH METHODOLOGY T07'AL �zEA. . . . . . . : 2 .21 Acres BASEFLOwS: 0 . 00 cfs F.AINFALL TYPE. . . . : KC24HR PERV IMF PRECIPITATION. . . . : 2 .90 inches AREA. . : 2.27. ACres 0 . 00 Acres TIME zNTERVAL. . . . : 10 .00 min C�i. . . . : 8b. 00 0 . 00 TC. . . . : 64 .39 min 0 . 00 min ASSTR.ACTION COEFF: 0 .20 PEAK R.ATE: 0 .42 cfs VOL: 0.29 AC-ft TYME: �90 min BASIN TD: A3 NAME: 100YR PRE-DEv SBUH METHODOLOGY 20TAL AREA. . . . . . . : 2 .21 Acres BA9EF_._.:._. . _ _ _ _ _ RAINFALL TYPE. . . . : KC24HR PERV PRECIPiTATION. . . . : 3 . 90 inches A,REA. . : 2.21 Acres 0 . 00 Aczes TIME INTERVAL. . . . : 10.00 min CN. . . . : 66. 00 0 . 00 TC. . . . . 64 .39 min 0_ 00 min ABSTRACTION COEFF: 0.20 �EAK RATE: 0 .70 cfs VOL: 0.45 AC-ft TIME: 490 min BASIN ID: B1 NAME: 2YR POST-DEV SBUH METHODOLOGY TOTAL AREA. . . . . . . : 2 .21 ACres BASEFLOWS: 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP FRECIPITATZON. . . . : 2.00 inChCs AREA. . : 0.42 ACres 1 .79 ACrew TIME INTERVAL. . . . : 10.00 min CN. . . . : 94 .00 98. 00 TC. . . . . 8 .81 ma.n 8. 81 min AHSTR.ACTION COEFF: 0.24 TCReach - Sheet L: 50.00 ns:0 .iS00 p2y�r: 2 . 00 s : 0. 0600 TcReach - Shallow L: 125 .OU k5:27 . 00 5:0 . 0100 TcReach - Chanriel L: 297.00 kc:21. 00 s : 0 . 0062 �cReach - Channel L: 90 .Ofl kc:21. 00 s:0 .0239 PEAK RATE: 0. 94 cfs VOL: 0.30 Ac-ft TIME: 480 min .-. Hpr �6 O1 12: 47p N• 7 4/26/O1 12 :�8 :43 am Shareware Release page 2 rsEx&Tr DETENTION VAULT CALCS FILE No. 79'l6-VLT ��_=v c=_=c c=��.�r r r��a c-__-c o=---____��..��-------------- BP,SIN SUNA7ARY BASIN YD: B2 1�AME: �.OYR POST-DEV SBUH METI�ODQZ,4GY TOT71L P1RE7,. . . . . . . . 2 .�1 Acre s BA;�FLOWS: 0 . 0 0 C f s RAINFALL TYPE. . . . : RC24HR PERV IMP PRECIPTTATION. . . . : 2 .90 inChe5 AREA. . : 0.42 Acres 1 .79 Acres TIME INTEI2VAL. . . . : 10.0 0 mi.n CN. . . . : 9 0. 0 0 9�3 . 0 0 TC. . . . . 8 .81 min 8 . 81 min ABSTRACTION COEFF: 0 .20 PEAK RATE: 1.43 c£3 VOL: 0 .46 AC-ft TIM�3: 4Ef0 min BASIN ID: B3 NAME: �OOYR POST-DEV SBLJB METHOD(?LOCY TOTAI, AREA. . , . , . . : 2 .21 Acres BASEFLOWS: 0 . 00 cfs R.AINFALL TYPE. . . . : KC24HR PERV IMP PRECYPZTATION. . . . : 3 .90 ir�ches AR�A. . : Q .42 Acres 1.�9 Acres TIME INTERVA.L. . . . : 10.00 min CN. . . . : 90 . 00 98 . 00 TC. . . . : 8 .81 min 8. 8X min 7�BSTRACTION COEFF: 0 .2D PEAK RATE: X. 97 Cfs VOL: � .65 Ac-ft TIME: 480 min BASYN 2D= C1 NAML'r G4& 2YR PO.,�aT-DL�'S7 (Wl•sTVAULT) SBUH METHODOL4GY TOTAL AREA. . . . . . . : 2 .21 Acres BASEFLOWS: 0 . 00 cfs RAINFALL TYF�. . . . : KC24TIR P�RV 2MP PR�CIPITATION. . . . : 0 .&7 inches ARF.A. . : 0 .42 Acres 1.79 Acre5 TIME INTERVA�. . . . : 10 .00 min CN. . . . : 90.00 98 . 00 : TC. . . . . 8.82 min 8 . 81 min ABS'�RACTION COEFF: 0 .2 0 PEAK 12ATE: 0 .23 cfs VOL: 0 .08 Ac-ft TIME: 480 min � Apr �6 �1 12: 48p p. 8 4/26/Oti 12 :48 :43 am Shareware Release page 3 PSEA&z� DBTENTTON VAULT CALCS FILE NO. 7976-VLT HYDROGRAPH SUNIlHARY PEAK TIME VOLUME ' HYD RU1vOFF OF OF Con�rib NUM RATE PEAK HYDRO Area cfs min. Cf\ACFt Acres -'-1--====0.I93===500=--=-=6811^cf T� �2 .�21 2Y,c Pt� I 2 0 .417 490 X2652 C� 2 .21 I�Y� PQ'rv 3 0. 696 490 19702 Cf 2 .21 �oc'C� P�-- 4 0.938 480 13205 c� 2 .21 ZY2. �f 5 1. 429 480 20234 C.� 2.2]. fo`{� PasT 6 1 . 974 480 28132 Cf 2 ,21 IW Y� POSt � o .2z$ 480 32s� c� 2 . zz �-r�+ R�st 8 0 .19 3 6 7 0 ].3 2 0 5 �L 2 , 2], Z'(� FzovTrc,p 9 0 . 417 540 2023� Cf 2 .21 �UY�(�3f3c.D 10 0 .177 770 1.3205 Cf 2 .21 2YR f1PY;C1. 1Z 0.343 550 20234 G:L 2 .21 (0'ttZ Fi�h� 12 1 . 9 7 4 4 9 0 21 Q 6 6 c f 2 .21 �tRSY�Gt��,CK- Hpr �b ul 1�: 48p p . y 4/26/Ol 12 :48 :44 am Shareware Re�ease page 4 � PSEA&TP DETENTION VAULT CALCS FILE No. 7976-VLT STAGE STORAGE TABLE j RECTANGi7I,AR VAULT ID No. 1 Description: VAU"LT (w 0 30�? Length: 7� . 00 ft. W�dth: 18 . 00 ft. voids: 1. 000 9TAtlC t----BTORAGS--"> STAGB <--`-S70RAGE----a S771G8 c----STOR7IGS----> ST]►G5 c-'-''-CpRAGg"�-a (!e1 ---cE--- --Ac-Ft- (ft) ---cf--- --Ac-Pt- (ft? ---cf--- --Ac-Pt- (ft) ---cf--- --Ac-At- __====»a�s.........__�«�_.-.......-....�.........n��.��.�........�.��.�............._'__--�-__-._'..""" 16.00 0,0000 0.0000 17.70 4295 0.0527 19.l0 4590 0.1054 71.10 6885 0.1581 16.30 135_60 O,OD33 ]7.80 Sf30 0.0558 19.50 4725 0.1085 21.20 7030 0.1612 t�.IV f%tl.UU U_0062 17.90 ��6� 6,0589 19-60 {860 fl.3316 21_3D '/19� 0.1l�J 15.30 405.00 0.0093 18.00 7700 0.0620 19.70 4995 0.11�7 21.l0 7290 0.1675 16.t0 540_00 O.Oi24 18.10 2835 0.0651 19.80 5130 0.1179 2i.50 7425 o.j705 1l.�O 67�.U0 a_oi�� 19.2� Z970 0.0682 19.9C 5265 0.1309 Z1-60 7�60 o.1ile 16.60 810.90 O.O1B6 18.30 7105 D_0717 20.00 5400 Q.1740 21.70 7695 0.1767 16,70 915.vo 0.0227 18�50 3240 0.0741 20.10 5535 0.1271 21.90 7636 0.179H 16_s� 1Dtl0 o,nZq$ 18.SG J375 0.0775 20.20 567D 0.1302 i1-90 "/96� U.1tl1Y I 16.90 1715 0.0479 16.60 7510 0.0l06 26.30 5805 0.1933 aa.00 8100 0.1860 17.n0 1350 0.0310 18.70 7645 0.06JT 50.10 5940 0.1364 22.1Q 8235 Q.1890 i��-7.0 1aa3 o.a341 19.90 3700 0.0068 3o.So sa�3 a_s39s zz_zo MlYtl u.lY%1 17.20 1670 0.0172 18.90 �915 0.0l99 20.60 6410 0.1426 75.30 8505 0.1952 17.30 1755 Q.0403 19.00 4Q50 0.093D 70.70 63�5 C.1S57 22.4D 86�0 0.1983 ]7.40 1690 0.0434 19.1Q 4185 0.0961 20.90 646� 0.1480 ZZ-�D tl%'/� U.�V11 �7.50 2025 O_0465 I9.2o 4320 O.o943 2�-90 6615 0_1519 17.G0 2160 0.0�96 i9.30 t655 0.1023 91.00 6750 0.1550 /� Rpr 26 O1 1Z: 48p p. 10 4/26/O1 X2 :48 :44 am Shareware Release page 5 PSEA&TP DETENTIO�t VAULT CALCS FILE No. 7976-VLT STAGE STORAGE TABLE RECTANGULAR VAULT ID No. 2 D�Scriptiori: VAULT (W/ 300) Length: 98 .00 ft.Width: 18 . 0o ft. voids: 1 . 000 sz�►cs <----s�ro�cfi----> �r�►cs �----sxonaca----y srncs �----sTow►c$----> sr�.ca <----�xox�►cE----> lftl ---cf--- --wc-pt- (ft) ---cf--- --Aa-Pt- {ft} ...�g_.. ..��.g�. (ft) ---cf--- --nc-Ft- • �..�--_'--_.__^'.^""...��=�:�ea:==�=:_:'__��_'_=:=:.n�--=�_��.��z==:=�...........�..�............____�. 16.00 0.0000 0.0000 17.20 2117 O.O186 19_�0 t23� 0.0972 19.60 6350 0.1458 16.10 176.40 0.0040 17.30 4297 U.0526 18.50 4410 O.101s 19.70 6537 D.1S98 ie.zo xyZ.go O.o081 17.40 2470 0.0567 18.60 4586 0.1053 19.Bfl 6703 u.��sy 16.30 549.20 0.0121 17.50 2616 0.060� SR.70 �763 0.109� 19.90 6l80 0.1579 16.40 705.60 0.0161 I7.60 �822 0.06d8 16.80 k979 0.1134 70�00 7056 0.1630 ze,SO 88Z.00 0.030Z 17.70 7999 0.0688 18.90 5116 0.1274 30.10 7z3� 0-166U 1G.60 3058 0.02d3 17.80 3175 O,OT39 19-a0 529Z 0_1215 20.30 7509 0.1701 16.70 1135 O.OTB� 17.90 3152 0.0769 19.10 SA68 0.1755 20.30 7585 0.�7�1 1e,90 1411 0.0�24 18.00 ]5Y8 0.0810 19.70 5645 0.1396 30,{n i76z o.1'�ni 16.90 1598 0.0364 18.30 3704 o.op5o 19.3G 5821 0.1336 20.50 7938 0.1822 17.00 1761 O.DlDS 19.20 ]881 0.0891 19.�0 5990 0.1377 77.10 1940 0.0445 18.30 �057 0.0931 19.50 6175 0.1117 �� Hpr 26 O1 iZ: 48p p. li I 4/26/O1 12:48:44 am Sh�reware Release page 6 QssA�� DETEPiTION VAULT CALCS FZLE No. 7976-VLT STAGE DISCHARGE TABLE MUr�TIPLE ORIFICE ID NO. 1 Descriptioz�: VAULT STANDPIPE Out3.et Elev: 16 . 00 ,� „ Elev: 14 . 00 ft Orifice Diameter: 2 . 077Z in. 2 g Elev: Z8 .8U ft Orifice 2 Diattieter: 2 .4785 in. 2��i� STAC6 <--DZSCHAAGS---a STA[iB �--DIBClWtp$---a BTACS <--DZ8Cfu1RGS---> STAGB e--DZ6CfiAR6B---> (cc> ---cLe-- ----�� lLt) ---ela-- ------- (Pt! ---�Ea-- ------- ttt) ---clo-- ------- z==a��"'.__'..�..e...:�:__�_�_�__�:'=:��e=��.."'....ae........�....�.'.'��'."'...�.."'.'.s,."".�:e.� 16.00 0.0000 17.20 0.�283 18.40 0.1814 19.60 0.3713 16.10 0.0370 17.30 0.1335 18.50 8.is51 19.70 0_1S]� 16.20 0.052� 17.40 O.1J65 18.60 0.1888 I9.80 0.7949 �6.30 0.0641 17_50 O.Sl3� 16.70 0.1924 19.90 D.4O61 ib_�a o.a741 17.60 0.1481 18.80 0.1959 90.00 O.�1G6 16.50 0.0828 1�.�0 O.lSZ7 18.90 9.3551 90.10 0.42T1 16.60 0.0907 17.lO D.1S71 19.00 0.z773 2�.30 0.6372 16.70 6.0980 17.9C 0_161� 19.10 0.2975 20_30 O.1170 16.80 O.io�� I8.00 0.1656 19.70 0.3149 20,40 0.4565 16.90 0.1111 7.8.�0 0.1697 19.30 0.33D6 20.5� 0.4657 17.00 0.1271 18.20 O.L737 19_�0 0.3d50 17.10 0.1229 1B.30 0.1776 19.50 0.3585 Hpr �6 0l iZ: 4Bp p. i2 4/26/01 i2 :48 :44 am Shareware Release page 7 PSEA&TP DETENTION VAULT CALCS FILE No. 7976-VLT STAGE DISCHARGE TABLE RISER DISCHARGE TD No. 2 Description: 100YR RrSER OVERFLOW C�iECK Riscr Diameter (in) : 15 . 00 elev: 20 . Q0 ft Weir Coe�fiCient. . . : 9 . 739 heiqht: 20.50 ft Ori� Coefficient. . . : 3 .782 increm: 0. �.0 ft srxc3a c--LIr��r�ua�x---� �rwc�c <--DZBQfARGS---> STAGS c--DIScc2A1�RGS---> ST� �--DISCHARf1R---� (ft1 ---�fo-- ------- {ft) ---cfn-- ------- (fC) ---cfs-- ------- (ft) eEe-- ..»s»=�==_�.'.._..___.....e...��s��===:=:=�e........�._�___�.�.....�.�"""��.�..�e..===__�.�.«=z�� zo.o� o,vvuu zo.10 a.3850 Z0.10 1.00Ot 20.50 ♦.30d1 30.00 0.0000 70.70 1_OS89 20.ti0 3.0797 I � /�. Rpr z6 O1 12: 48p p. 13 4/26/O1 12 : 48 :46 arn Shareware Release page 9 PSE�&TP ' DETENTION VAULT CALCS FILE No. 7976-VLT I �______________e=��=saa��.��w�...�r�w��.��s�== I LEVEL POOL TABLE SiJMMARY rw�rcti ixFuox -sro- -nzs- �-FSAtc-> oorF[,ox sTORacs a-••-•---DESCRIP'ci�i---------> lefo) Icfo1 --id- --id- <-ST)►CS> id (efaY VOL {cf) � ZYA. RAVt'SD -...............,,. 0.19 0.74 1 1 18.73 8 0.19 7661.15 cf lOYR ROal'� .................. 0.42 1.43 1 1 20.00 9 0.42 5405.69 cf 2Y8 FI27t►I. .................... o.iJ o.f4 2 1 10.2! So o.id •oas.17 uL 10y"R g=2QAI, ,,,,,,,,,,,,,,,,,,, 0.41 1.11 2 1 19.39 11 0.7f 5975.16 cf 100YA O_B_ CHSCiC ............. 0.00 1.97 4 2 30.30 1Z 1.97 7580.84 cf _ I i� Rpr z6 O1 12: 49p p. 14 . .. . ... . _._._..._..- _..-�-•------ - ------ -. . .._... ._. ..._ ...._._____.. . .. _ --� U. S. DEPARTME3�'Ok�AGR.ICU�,TUR� � SOIL CONSET:tVATION SERVXCE 47e�2� y _ R_0 E R.5�. 8E.�7TLt( g • . �. . � . � . ,� _? � � - '`-, ��'. �+� • �`; �`�a ; .,�, � .� , _ .� � �, � . . � � � _ - .� ` _ • �'. a - � �,'• � Bl� iver ''ti• -`- _ , =,1 ; . ti� � ' . � ;,,,: . ,,�,�. � � •- .. - •-. :' t ,..r+'"•. ,,..�' •�• .� � N� •�'.. i . _ , ► • •�"�• aw, '� . � - .: ti ' -:;: ....;;. • . ! � .- -,�,, ' �,: � . .. . !'s' . i or . �� .`BOO'' aM.• ••:. - .. ,, � y . _ `�� t 2 ' t' - • :;�. �s J � f Qb � l � ►' m 8lC. t ' . ' • ♦ ` . . . - W p �•• , . . ; BeD • ' ' . ', ( �goC. ,'�':'.. y �P':. 8t.s'� ;.�,�� owo��T �� ,� ' .e �. � �r'•'�' ' ' '�.qoP - �• � \ �eq`� � iT'�y�. � . ..t��` 1 .� ,� � �I ��YJO ti9a�� ' , � ,•� �� Ld;G �"^ Wo S'MY '� ��t ll� N8 � �� '�q -- ' , . PY j g� � Golt�owse . � � �f U► I � � �`OI� �. ' ' 1 A ' I BM o � � � �e� 30�,• �' Saw e • pR7N ti � � �Ois � W .Y,1b � p N� t!r UC + ' �� " � y 2. W � h S ' � � � 2 U� r• ''�''��' � 1 �• � '' Q �,N ;✓r" \� � .'°i �i ,� I ur � 4, i�n8��i � : t Pv F � '? O u �i ��r � Oti �� R�� . � (�Cyl Ur � i� r Ur :�w � t Wo. lJ � � t'}� ;�� 1 u '� o i'7ratic i...n 1 I w� n I '�— — ~�--/ � •- � r 1 � �j �ti�-'%i� � 27'3a' „ � ; "�� ' u. . . :� n� I R �, � � „_ .� c +�. �. . � � � . ; o . � so. t� n � .$ z � � J R,. � � ; �►o t:A � i.�� •r ; , �25 �' --- — _ _ ____ _ p. 15 � Rpr 26 O1 1Z: 49p u. 5 uCt'ARTMINf Ur n(:�tiCu�iturC SOi� C�NSERvn�riON SEKv�r,E KING CU�INTY Af2FA. t � SQIL LEGEND Tw.tc.s��.p:�al I.nr��s�h.. ...�.....J.�...«�..� w.�.w�a r c.a�4��.., w, B.C,O.E,o� F,:.d�cv�es•�c clo..el st�. SyTbols w:M.w�.sk,a k��.r o.e rhe+�ol..�a.ly le.et so.ls. SYNOOL NAUE �•._. Aq8 A W�.�»oad y.�relly�o.dy leow,0�s 6 yerce�t alopes .•1 AqC A�de.�.oed y�wsltr sonE�boq,0�0 15 pa+hM slopes ' ` eqp wtJ,.,,,.ed y...wtlt*�••dy�ey., 1�H JO pae�.si stopes A4F ♦Ida�wood«d Ki1wp toils,vNy sle.� ' � I1�8 I�eM+,A�den.�ad iwauriol,0�s 4 perc�k�lopea• �„ n.wC Ar�e�s.Ald�..+ood w�a�e�isl,b N i5 pwce�l slop��• � � /�n /V�Mi�EYt!!�/�OIp�O�� ' ~� II 8eC •B.ovs{re qro�elly a�ndr I�e...6 N IS p��ceM s1eP.+ �" �O BemHih y�rw��l'iO�Y{00�1�15��OtKIM��opes . . 1. E�.F 8.-...si�e y..retF,•s�+d�1ees,�:e TS pca:�at zla�� B� S��II.gF.�w.�k baw �...� ��.. & B�iva�:If Irw 8u O�e��ey iih loow ��,,,,, I Cb Cwshl B�«h�s �►•�• . 1Y.r� Ea Ea�a+.tlli teen Ed E��wk4 fM�e sandr(oaw � . � l•••• E+B fvK�rt q�welir to,vdy lee�,0 to 5 O+�c�n1 slsp.s . EvC E••i..�r o�we�W�endr Ioe�,S�.15 o+�e�f�{op�s • . •�••• I E�o E.w�r.9�.Nb srd�loow�t5�e 30 p«eM��lapes 1.•... I, E� Evw��.Ald«weed q..wl�y aondy l�ews.6��15 paeeew s{epe� • :L_r. I f..A M�d:..wl.10�.ffe.swtil,0 ro 4 y�ee«v.ip.� . . 1^� Iw1:ewla lao�y fln�srd.�N IS O��•wr ateN. . . .. •' InD Ydf.nel�I.o.�fM�wJ,IS N JO pKMv s�pef I • KvB Ki�soO s►k(.e.y 2►.a w^�•,r:la�a ' �i.»w Kvc +r��v+�a��,,a�.1S psRM+t abp�f Kpp Ktfa.o.►Y tee..,IS h�O�..�c«+.t.q.. . k�"" K1C K{ow 9wne11p laww�spd.A lo IS CwhM sleprl it...1d .,�+ Mo Mlwd o1jwN�1«d . t•.�- ►f.0 . N.+b�.�..r�"�'MuY I.e.�r se�d.Z�.l5 v.Ka�f afay.a �—i—, Ny N�..bM9�ih hew N1. Hedoee4�iA(ew ••'t�• Ne Ner�v sendy(ww . . . . • ..� p OKo�/�W t-�m �f Orid:�slw leow O+C 0+��o��b��,da 1S o.�e�aMo.. � o.v o+u�l�tb 1ee.�IS�•2S..�c«�.skves . , O+f 0+.14 w+�l�r L�.�.�0�.75.1we..r•IoY.. • i.N Pe dlkl+oek bswh(7.�.sond Pk P�klwek�w s«dy Iw�w c''�. R. P.ipe�aif�y e�r(.en� , . pt' M��tir/1.�.�w�dp lesa v ReC Raq�r fMe lvdy lao�.0l0 1S P«e�M sley�r .. . � RoD �lpnsr(i.r s��4aiw�)S 1�2S�erc�N slepts � . RdC Rei^r�•I�fG«v4�aueiN�,aler.�q• .- ROC Aoqwee-Idi�nOM�ssoUsHpy.�ode�a��h's��o• ` Re R�wl«�siM IoM , . . RI. R:.�..�wsA � $� $�tol slll lee.. Sh Sa+��sti s�h Ise.. Sk See��M w,.e\ Y� S�ka wc4 5� S��IN Foe',. . • Sn S�er.�.:l.lw.� 5� y�o*s�w:�A��H la..�,tA1cL awfet��o.bm Sti Sv��M sil.Ia�w � T� Y„1...�4 r.�t� i �, �_� th V�nw le�e ��Wo tieodrw:tlt s.i�I�ew. �� i r..c�+�'.o�d�••.�.�.��.�.t.w»nl:.�.n�N...1.w.r�.... �n sM�N_�W .��!1��fA Y wNcllt��•11 wM/�1��• .n�f.0��IN • . ' t.srr.•d w.el�M,.�t� Rpr 26 O1 1Z: 49p p. 16 KING COUNTY. WASHINGTON, SURFACE WATEIt DESIGN MANUAL (2) CN values can be area weighted when they apply to Aervious areas of similar CN's {within 20 - CN points). However, high CN areas should not be combined with tow CN areas tunless the �� low CN areas are less than 1596 of the subbasin). In this case, separaie hydrographs should be generated and summed to form one hydrograph, F1�URE 3.5.2A HYDROLOGIC SO�i,G�tOUP OF THE SO]LS IN KING COUNTY HYDROLOGIG HYDROL06iC SOIL GROUP GROUP• SOIL GROUP GROUP' Alderwood C � Orc�s Peat D Arents, Alderwood Matcrial C Oridia V Arents, Evereit Materlai B Ov3q C Eeausite C P�chuck C scltingham D Pug?t . D 8riscot D Puyaqup B 8uckley D Ragnar B Coasial Beaches Variable Renton D E�rtmont Stlt �o3m D Riv��wash Variablc Edgew�ck . C Satat C Evereti ' A/B `Sammamish . D lndianola A Seattle D Kitsap C � Shacar o Faaus C Si Silt C Mixed Atlwial �and Variable Snohomish � Noilton A Suttan C Newberg B Tukwaa D NooksaCk C Urban Variable �. Normal Sandy Loam D WoodinvAle D �- HYDROLOCx1C SOIL GROUP CIASS�FICATIONS a (Low runvfi potential). Sa'Is having high infiltrat�on rates, even when thoroughly�vetted,and cons�sting chfefly ot daep,weli�o-axcsssn+ety drained sands or grzvel.s ThasP soils have a h{ph rate of water transrnission. B. (Moderately low runoff potential). Sods having moderate i�f�tration rates when ttbroughly wetted, and constscing cnleny ot moderately ltne ta moderately�va�� ex:ures. 7hese soAs have a modcrstc ratc of water transmissior�. C_ {Moderateiy hiQh runoff potec�iai). Sa1s having slow tnfiltration rates when thoroughly wetiecf,and cansistirig chieny of so�s with a laye�that impedes downward mwemsnt oF water,o�soas wan moderatery � fine to(ine texturcS. These solts have a slow cate of water transmissfon. � D. (High runo(f polcntla!). So�ls l�ving vary sJow infi�tration rates when tharot�c�hly wattE?d and Con5lstinQ chietly of clay so�s with a high swelling potential,so�,s with a permanent high water Iable, so�s with a hardpan or ctay layer at or near the surtace,and shatlow soi►s over nsa�iy impervious mater'aL These soils have a very stow rate of water trar�smission. ' From SCS,TR-55.Second Editlon,June 1986, Exhibn A•1. RevLsions made from SCS.So8 lnterpretation Recard. Form #5.September t988. � 3.5.2-2 11l92 Rpr 26 O1 12: 49p p, 17 KING COUN 'TY, WASHINGTON, SURFACE WATER DESIGN MANUAL TABLE 3.5_2[3 5CS�i�E$TERN WASHINGTON RUNOFF CURVE NUMB�2S SCS WESTEfiN WASH�NGTON HUNUFi� t;UFiVE NUMB�RS (Pu�fsttied by SGS tn tss2) Runoff curve numbers for setected agrfcultural, suburbdn and urban land use for Type tA rainfall distributio�. 24.haur stQrm dUratinn. CURVE NUMBERS 8Y . HYDROLOGIC SOIL GROUP L,AND USE DESCR[PTIOl�' A B C D Cultivated land(t): winter condition B6 91 9a 95 Mountain opere areas: low growing brush and grasslands 7a 82 89 92 MeadOw or pasture: 65 76 SS 89 Wood o�farest land: undisturbed or older second growth �a2 64 7F 81 Wood or foresi land: young second growkh or brush 55 72 �'� � Orchard: y�ryth cover crop � . 81 88 yZ 94 Open spaces, lawns, parks, gdf courses, cemeteries, la�dscaping. good condition� grass cover on 7596 or more of the area 68 80 86 D fair condition: grass cover on 50� to 7596 of the area 77 85 90 92 Gravei roacfs and parking IotS 76 85 89 91 _ � Dirt raads and parking Ipts 72 82 87 89 Impervious surtaces, pavement, roots,eta 98 98 96 98 Open water bodies: lakes,weilands, ponds. CtG. '10U 1Q0 1p0 100 Single Famiky Aesidentiat (2) Dwelting Unit/Gross Acre 96 impervfous {3) 1.0 DU/C�A �5 Separate curve numbe� 1.5 DU/GA 20 snau De se�ecsed 2.0 DU/GA 25 for pervlous and 2.5 DU/GA 30 Impervious portion -- 3.0 t�l1/GA 34 c�f the sitA or basin 3.5 OU/GA 38 4,0 �LI/GA 42 Q.s pu/c� as 5.0 DU/GA a9 � 5.5-Du/GA � 5a 6.0 DU/GA � 52 ' 6.5 DU/GA 54 7.0 Dt1/GA 56 �. . � Planned unR developments, °6 impervious cwicJoniir�i�un5,a�raittj��zfs, must be computtd commerCial business and . industrial areas. (1) For a more detaled description of agriCu�tural land use curve numbers reter l0 NatlOnal tngoneertng Handbook, Section 4, Hydrdogy,Chapter 9,August 1972. (2) Ass�mes roof and driveway runoff is directed into street/storm system. 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' S P4/26/0l 1:0 :20 pm Shareware Release page 1 PSEA&TP DF.sTLNTION VA[3LT CALCS ' �'ILE NO. 7976-VLT -------- BASIN SLIMMARY HA.SYN ID: CI NAME: 64� 2Y12 POST-fl�V (WETVAULT) SBUH METl�ODOLOGY TOTAL AREA, . , . . . . : 2 .27. Acres BASEFLOWS: 0 .00 cfs RAINFALL TYPE. . . . : �CC24FiR PERV IMP pRECIFITAT20N. . . . : 0.67 inches AREA. . : 0.42 Acres 1 . 79 Acres T2ME INTERVAL. . . . : 10.00 min CN. . . . : 90 . 00 98 . 00 Tc . . . . _ 8 . 81 min 8 . 81 min ABSTRACTION COEFF: 0 .20 pEAK RATE: 0.23 cfs VOL: 0 . 08 Ac-ft TIME: 480 min , �� Rpr z6 O1 1z: 50p p ;, . 4/26/Ol 1 : 0 :2Q pm Share� PS�A&`� � DSTENTZOI3 VAULT C. FILE NO. 7976-VLT HYDRUC�iZA�i-I Sli�KY PEAK TIME VOLUME HYD RUNOFF OF OF Contzib NUM RATE PEAK HYDRO Area cfs min. C�`AcFt Acrc� 2 . 7 490 12652 2 .21 3 0 .696 2 cf 2 .21 4 0 . 938 5 Cf 2 ,21 5 . 9 480 20234 �21 �� .9T�"'_ ..� ��7 0 .228 480 3287 Cf 2.21 WQ 5'�-�M �� '�'�l 9 . 540 20 2 .21 io 0 . 1�� 7 3205 cf 2 .21 11 550 202 2 .21 . f1�.sp QF,p�D Vi3L�SM��c. �O�- �-TV huL.'�: —�oPt�.a� l ruPv� � �12k�t�t�2 'i�'#�� l �• — No �� tSK. �toSv-n't� - t�1 �R��'c5� v�t�L vawu�.� 8Y l.5 � F�e, t� gt�u�sl�cc.� . — ��Zg� ,c 1.5 = 4�930•5� cF ?��D � V��l.uM� 'P(�a�tl�.� � Cj�2`�2 C.F � . �,� s�� r- -r•, �t�`� = i% o� I wIPV �u�2-� � 1�1�`�12 � t%. _ 'I� �F �2a.c��cA= �i$' � l 8 � _ �,1 b4-SF otG V. CONVEYANCE SYSTEM ANALYSIS AND DESIGN Enclosed are typical calculations necessary for sizing of the pipe facilities proposed on this project. The rational method and Mannings formula were used for sizing purposes. Conveyance pipes have been sized to accommodate the 100-yeaz storm event at the flowing full condition. The intent of the pipe system within the parking lot is to convey stormwater runoff into the detention vault. The pmposed vault has not been sized to accommodate any off-site development. 7976.003[DED/mm/kn] 7976-'._. BARGHAUSEN CONSULTING ENGINEERS-PIPE FLOW CALCULATOR usiny the Ratlonal Method&Manniny Formula KING COUNTY DESIGN FOR 100 YEAR STORM JOB NAME: NOTE:ENTER DEFAULTS AND STORM DATA BEFORE BEGINNING J08#: 7976 DEFAULTS C� 0.85 n= 0.012 REVISED: 3/15/01 d= 12 Tc= 10 A�Contributing Area(Ac) Qd�Deslpn Flow(cfs) COEFFICIENTS FOR THE RATIONAL METHOD"Ir-EQUATION C'r Runoft Coefflcient Q(�Full Capaclty Flow(cfs) STORM Ar Br Tc�Time of Concentret(on(min) Vd�Velocky at Dasipn Flow(fps) 2YR 1.58 0.58 1=int�nsity at Tc(in/hr) Vf�Velxity at Full Flow(fps) 10YR 2.44 0.84 PRECIP� 3.9 d�Diameter of Pipe Qn) sa Slope of pipe(%) 25YR 2.66 0.65 A� 2.61 L�Lenyth of Pipe(ft) n=Mannlnp Roughness Coefflcient 50YR 2.75 0.65 Br- 0.63 D�Water Depth at Qd(in) Th Travel Time at Vd(min) 100YR 2.61 0.63 FROM TO A s L d Tc n C SUM A A•C SUM A•C I Qd Qf Qd/Qf D/d D Vf Vd Tt a�sa�a �saM� ��a�� s� �s�� tsssasaa:x suass aaa�� tat�s iiLO�� 0C2�0/�aa�� asaaaa saaoss aca::a ��a�� sasa maaam� as��s� �s�s�a . CB8 CB5 0.47 0.62 97 12 10.0 0.012 0.85 0.47 0.40 0.40 2.39 0.95 3.04 0.314 0.383 4.80 3.87 3.42 0.47 CB5 CB2 0.56 0.62 200 12 10.5 0.012 0.85 1.03 0.48 0.88 2.32 2.03 3.04 0.668 0.597 7.17 3.87 4.14 0.81 CB4 C82 0.37 1.00 97 12 10.0 0.012 0.85 0.37 0.31 0.31 2.39 0.75 3.86 0.196 4.296 3.55 4.92 3.78 0.43 CB3 CB2 0.34 1,00 85 12 10.0 0.012 0.85 0.34 0.29 0.29 2.39 0.69 3.86 0.179 0.283 3.40 4.92 3.71 0.38 CB2 CB1 0.48 2.39 66 12 11.3 0.012 0.85 0.48 0.41 1.89 2.21 4.17 5.96 0.700 0.617 7.40 7.60 8.23 0.13 CB1 VAULT 0.00 2.38 26 12 11.4 0.012 0.85 0.48 0.00 1.89 2.20 4.14 5.86 0.696 0.613 7.36 7.60 8.21 0.05 VAULT EX 60" 0.00 0.50 40 15 11.5 0.012 0.85 0 0.00 1.89 2.19 4.13 4.95 0.836 0.697 10.46 4.03 4.51 0.15 pe 1 ! # ± �\ �'`� � � � `� � ihr a-•}�� ,�� `a\\ ` I I ��;,f � t � , �v � I 1 .r c��_ ��_�3 � �`,,{��l��'J ,�� %U ,� 4,`' ,v �k,-,r� . �� 5� � � .s r �ar<r c. � t � �� _ /-� 5 �� i Q � ��,!`` ` �s?-tv�cr� 1, `�.�ry�� ! � ��/�� \ � _.---.. m � �� r, l 'IY�L.i " ��.._-, �--�� \�� \ �� 1.0 `�� / �__ � � ar�r�e �('�r - c+ r r. ��-/ / � �so�y,� x�"g' %� /✓i'~3� I '/ � / {•} . �%��i�i� % � n �� .a• �`r't\/1Q'�� ✓ ��i�.�/ � !`--� � v�.\,s- j %%/� �� - ��_ �x�.as � �2 a� �� —T:o a¢`U�--- —'_� Tl /��. J� Wm.uist' � ,+ � 21_ _'--� e�ia'�v�� /�� ii� ��`c�3�aa+�s�A �`� i � i.�- /i _/�P� ,�%�� a o�t,�xs �� 22 /�• �J � ��i ;s" "'�'� ' \. �\\ �'j� C `� ,_—_"'�� j ` </ � i- � -�--`� � � � , �� 22 /%/ (t��Q�' �.�-`; ' :4. F�r:�� \`. \ ��'' Fl/ J ✓/ �.� ,,ii�// // � xrr ;�' \\ � !i � ,�� j% i r 1 w nwnc rPa,c�rr�� 11 `I � �/ - � ; � fart.Frx�svo�ob�'� I �� ' N t 4 �� / / ; � N �G�<796e�m% I 'N /// � 'f� �i . .'.?,, t - ;_'-4-}— /�' `L b j%�( /%;��„ � ! � � � A��a��%/ 7'%%� �--�._l, 1� I tA� ,(�- �,c , -'!� � i �, w�� sR� 1 � `, i� � � ` — �� / ' ' / � �— "�`_"` �� S , �� !—� i � �.�M�� rQ,; �� /� /1/ �f ��{ � /%, i _ ,--4 f�0' � I :') i� �/��t 5.., (�f'X v! � ��1 // .- _ . . 'k�!--{'}aEs: ..Si _ ..� ANT or i }L�l! . �� /, �11 %1 f ��r"�5'_i w . _�-�`_ \ � I ?o, t �.a% `C, -� /i. '' Np, 4�'� vr-i , _ i � �,��. /`,�/� � ""-/� �t i - � �. •,r . T . . i � � //r+ : � , i _ _ it i / .:�. �.\ � 4 ' _..�- I � . k ' � � \ �S i' 1 J � `\� i � _c _ � / , ' '` \ �� + �f f I �, � � � � \ !�� {�� ; ! 1�' l \ � � � ' ' ; � � �, � ' + ,l� a` � �+'�3v ` :s: — a; r � � � 14 � � � �� " t �,� '\, ,/ ,�'� � �r � '�� '� � � '� � �.�t 5 � , . _ _ .f' 4' ` rcyca+ � ,� '}:. � � � , . � i !� �i �f _�+ . \� �` I � �� \ � � I � � \` \ za' � l2�� . -" , � � � • � � i � � �� A/ � �� _� i . : ; � ,, , � - � �' i � � � / .m,=R�r ,�', � \ �� :� � j � � ` �\ � �'--�._ � \ � � I; �:�341 A� � �� ' . � i : ; � � B•:. � i � 4 � - � f 10 . 18 � . 21 �� 2h r - - � =� � / , �9}iAi7 � ��i �./ (/ . . 7AYE'�ET:i '� j I . � '4 I ' - � � �." � / t •( �� .. ' I' . ,�l � ��i � is �, �� . - �� , ,� ; ��_n.� 1= ,,�., ..�- - - _ i�r�%i �� _ �—, �e s•;�;.�as.r - . �6'(Si�19.5. . � sown a±�r- . � �F � IE CTH. OtAN.+�71T' ma �� r �—�— YK L G�_ ^� /I T / tC'C7C � �� -- --- _J __ i W �-,�___- e�-cW.: 12. � _�_�_7P�C � _��`_�— �_"__ --$�--_. �. �,� ' t, ------1��'__ ` �� .�__ +Y rc i �' � Fl�.I.S 9J6M£ __'�"_'___'________'_—_Sti3_GL3'E__, -�� --�—___T_�� 24 7 :'t<_;i�a:xC. T--'—'y--"—"_'�_ �s;JPMQL ..-QN. �G�____` �c,�vo °31=L �3------__— " au.¢un. s� --=$ - ----i.:,,.,r�:.�_�� AF-��Ti S T�E��' E�-+o-� � , - ------------------ -- ---- �_�.r� „_�_._. ,,,_ s aa�a s[cnw uc R.".�F:?�,SFS 4.v'4�K�.r�i K*fA:w:i1�n SIX:�Y/M 5' �� ^ 1 €a•'�ie.�a' ��r(s;=is�e' VI. SPECIAL REPORTS AND STUDII:S � VI. SPECIAL REPORTS AND STUDIES Miscellaneous reports and letters have been included for review. 7976.003[DED/mm/kn] CW-Gb-LFJbl i��.s rr�� rr� r�l CROWSER SEATTLE. TO 94252518782 P.01 ; � � I � I I w�w,hartcrowse�co�H elNeringsmariersofutrons � � I ( ' � � FAX Transmift 1 ; ' i � Date: Aprii 26,2001 Job/Proposal No.: 7508 � � Number of pages ir�cluding caver sheet: 1 b Re: Puget Sound ffecvic;an A ren6ceship Trainin Trust i Name Company Fax# Pho� # I � I T0: Len Holm Holm Construction 425-557-2688 a25-55 -2640 � � . { Cc: Don Dawes Barghaeuen 425-251-8782 42r25 �i222 � Gary Bedmer f Cbalker Putrsam ColGns 253-383-1557 253-38 -2797 � Scott � � I I f i I Frottl= )eff Wa er Hart Crowser � (206)328-5581 (206)3 49530 J I � ' � MESSAGE: Hard rnpy m oUow in tf�e mail. ' i � � I � � � I i 1 7FNS M£SSAGE IS tNTENOED ONt FOR THE USE GF THE INDMDUAI OR ENTITY TO WHK:Fi iT 15 ADDAESS@D ANA�►Y CONTA! tNFOA1�lA77pN 7HAT tS CONFIDEl�1TiAL OR O7HEhWiSE DCEMPT FROM DtSCLOSURB't0 OTHER3 LlNDER APPI..tGABLE LAW. If the reacler afthfs rt�age is not the irnenaea redplent,w tna ecnpfoyse ageM responslWe for dsliverls�g the rt�essage to the Intenaed recipie�,p�ease reco�ize tt�at ariy dlssem n,dEsvlbWon, I a copying d�ttis comnwrtir�6on is ss� pronibi�d. K yoo hava r�cslvsG ttu�communicafion in arror,plQase namly us enmediatey by talapho .ane ratum mA f original messag0 to us a�f�e above a via iha UnitaC States Post�Sen�ica. TRank you. � PI.EASE�CON�ACT(206) 3249530 IF THERE ARE ANY TRANSMfTTAL DIFFlCUITIE . � � 1 1970 Feirvi �Avenue Ea4�SeaNe, WashiRgtorf 95702�+6919•Fi4X 208.3Z8.5581 •TE�206,324.9530 � I I ; Ancflorage �B •Chicago�Dem�pr r Fairbanks�Jetsey C�ty�Juneeu �l.ong 89aCh �Portfa/ld�Seaule , ' ` CK1-LD-LYJYJl tc-.�rr�•� rKt�'i hi��I I.KUkbtK 5tH I I Lt. I U 94252518782 P.02 I �' i � .hartcrowser.com; ---- ----....._ _ . . . . _. ._.....__—.. — --------�-� r � i vering SmartPr so/utions April 26� ZOO� � A��Ch�r�qPl i , � t Puget Sound Electri ians Apprenticeship Training Trust � c/o Len Holm � ' Holm Construction ervices g�s`O� 310 Third Avenue i�E; Suite#103 Issaquah, Washingt�n 98027 . � . R� Geotechnical Design Recommendat�ons Chrcag I StorEr�water Detenfion Vautt Puget Sou� ffectricians Apprerrticeship Training Trust . � Renton, W hington i 7508 ' Denver Dear Len: ( I This letter report presents our geotechn�caf design recommendations for the proposed � � underground storrn�vater detention structure at ttte Efectricians Apprenticeship 7raining rairbank� � Trust parking area � Southwest 7tf� Street in Rerston, Washington (Figure 1)_ The � information is org zed as follows: � ■ Our Understan ing of tfie Project� • JcrseyCity ■ Limitaiions of r Work; � f I � ■ Subsurface Con itions; ,�,�e3�,� ■ Geotechnical E gineering Analysis and Design Recommendations; and I � S 1 s Construction C nsiderations. tong 8each � j OUR UNDERST NDING QF THE PROJECT We understand tiia a concrete stormwater detention strurte,re will be placed below grad Po�r��»d at the Puget Sound (ectriciarts A�prenticeship 7raining Trust parking area in Renton, � Washington_ (See gure 1, �ciniry Map.) The approximate dimensions of the structure a�e : 90 feet long by 18 et wide by 10 feet ta11 as indicated on pre(iminary design drawings � • Seattle T970 fairview Avenue East • Seatde, washinqt9n 9N707•3699 tax 106-378.558f Te!206.324.9530 � �-,-�o-�� c•�r r�, rRur� n�i �Kuu�tK JCH I I Lt. i u y4G��51878� P.03 I ' � � � i Puget Sound E(ectriaians Apprenticeship Training Trust 75 �8 � April 26, 2001 Pa�e'2 i I . I ' I provided to Hart Cr�wser, Inc by Barghausen Consulting Engir�eers, Inc. 'Che preliminary , � pfans note tf�at the s ructure w�il be placed so that the top wili be approximately at elevati�n � 21.5 feet,which cor esponds to approximately 1-]/2 feet below proposed finished grade � � � � � ! I ' LIMITATIONS Oi� OUR WQRK . I � � � � � ; , Hart Crowser compl ted this work in genera( accordance with our contract change order I � I dated Aprii 9, 2001. We pesformed this work for the exclusive use�of Puget 5ound i � M EEectricians Appren eship Training Trtast and their design consultants for specific I application to this pr ject and site. We performed this wortc in accordance with generally I I accepted profession I practices in the same or similar Iocalities, reEated to the nature of ih i work accomplished, at the time the services were performed. No otlier warranty, express�r � implied, is macle. i � I I ( E SUBSURFACE C NDITtONS I ! I � � During our initiaE sit investigation fQr the pavement area, we excavated five test pits acro s : j the site on Decemb!r 1, 2000, as shown on Figure 2. The test p;ts ranged from ahout 9 t � E 9 0 feet in depth. � ' I � Although TP-2 is the test pit closest to che proposed detention vauIt,we based our ( I interpretation of the subsurface conditions on materials encountered in a!� of ihe test pit I I expCorations as they ay be more representative of overalf site conditions. The nature an� extent of variatior�s etween or below the bottom of#�ese explorations may not become � ; evident untii constr ion begins. lf variations tfien appear, it may be necessary to Ii re-evaluate the reco mendations of this report. Note that t#�ese explorations do not exterid '• to the bottom of ih proposed vault, requirir�g extrapo(ation of the existing data for � I formufation of our geotechnical recommendations. This approach was chosen by PSEA77� realezing that fielcf a�justment in the vauft design may be necessary. i Soils � � � i �M In general, the site s ils consist of � i I ■ Soft to medium stiff, moist, slightfy sandy SIi.T (Topsoil) with an organic root mat; over I i ■ Medium stfff; m ist, mottled, slightly sancly SlE.7; over � � � � ; � . � � VJ4-GD'LYJYJl 1C•Jt3F'1'I t'KUI'1 Y$1�I I,KUWStK 5tH I I L�. �U 94252518782 P.04 � i � I , .. � Pu�et 5ound Electri -ians Apprenticeship Training�Trust 7�Q8 April 26, 2001 Pagei3 I j ■ Mediurn stiff to tiff, moist, mottled, clayey SILT wit#�abundant wood debris; over 'i � I ■ Medium sriff, w i�, fine sandy 5(L7 to SILT that extended to the bottQm of most df our i � ` explorations. � i A more detailed de ription af subsurface soil rypes is as follows: � i I I , i i ■ Topsoil. The to�soil is generaliy in a soft, moist condition and contains a significant I j arnount of sift a d organic rnaterial. � � . � . . . � ■ Medium stiff, s) ghtEy sandy SitT. 7fiis material generally consists of inec4ium stiff sflt � with a smail am�unt of sand-sized particles and an abundant amount of organic materi (. ; This socl would e dif6cuit to compact to a dense condition �f�t became wet and is j � generally not su able for direct compaction. i 3 , ■ Medium stiff to stiff, dayey S[�T. This material generally consists of inedium stiff to sti , j clayey silt witt� abundant amovnt of wood debris. Similar to the overlying layer, thi � materiaJ is not s itable for direct compaction. � � ■ Medium stiff, f e sartdy SILT fo S1LT. This materia!w2�s encountered in three of the ! five test pits {TP- ,TP-4, and TP-5}and consists of wet, medium stiff, fine sancfy SlLT ` (TP-1 and TP-5) or mecEium stiff SiLT(fP-4). The materiai contained no noticeable � ' organic material ln the three test pits in wF�ich grouncfwater was encountered, it was � �res�nt in this la er. I !� . I Groundwater We encountered gr undwater in three of our test pit excava�ons(7P-1,TP-4, and TP-5) ; , during th�e time that he test pits remained open. ZP-4 and TP-5 were excavated in the � ' � smaller af the two p cels (the northem �arcel located between the raifroad tracks), while � I , TP-1 was excavated n the northern portion of tfie larger parcel. Groundwater was not � encountered in the st pits excavated in the southem portion of the Earge parcel. The I ! samples that we obt ined above the grouncfwater tat�le were damp or moist. in the ti�ree ; test pits in which gr undwater was encountered, its depth ranged from 8 to 10 feet below� graund surface_ No e that ihese groundwater observations were observed at the tirne of � the excavations and at groundwater levels may fluctuate due to seasonal changes, rainfal, temperature and o er affects, incfuding the amount of time that an excavation remains � � open. ; . , ' . I I i � � � - � ! � �-r c� �wi ic•.�orri rr�u�i rx-r�i �.rtuw�tr� �r_F-11 ILt. lU y4��J1�3'ft�L h'.l�5 i I i �1 I � . . . ; Puget Sound Electri �ians Apprenticeship TrainPng Trust 75 �8 April 26, 2007 Page � GEOTECHNICA ENGINEERING ANALYSIS AND DESIGN i � RECOMMENDA IONS � i � I We have deveEope these recommendations based on the conditions observed in our sice i � investigation and th preliminary design of ii�e stormwater vault, as previous(y described. j I � Vault Subgrade � � , � ' , i i i As described in t�e UBSURFACE CONDITIONS section of this letter report, � groundwater was e countered in three of our test pit excavations at deptfzs ranging ftom � • to 10 fee� The thre_ test pits in which groundwater was encountered were excavated �n � the northem portio s of the site, but it is iikely that grounciwater will aEso be encountered i � the southern portio � during excavation for the stormwater vaul� Due to tfie probabfe soft� � i � subg�ade soils, we r �commend that the contractor overexcavate at least 1 foot befow the � � proposed elevation �f the bottom of the structure and place a fayer vf crusf�ed angular roc�c � to provide a firm ba e for the concrete structure. We also recommend that a geotextiie � ' I separation fabri� be placed below the crusheci rock on top of the exposed subgrade to i prevent the angular ock from penetrating into the silty subgrade soils below. I ; We recommend th the angular rock layer contain no more than 3 percent fines (ti�at i portion passing the o. 200 sieve) based on tt�e minus 3/4inch fraction of the material an�l � that it not contain a y particles greater than 2-1/2 inches in diameter. we recornmend the� � j use of the standard "shoulder ballast" material as described in tfie current Washington State � Department of Tran portation Standard Specifications for Road, Bridge, and Municipal � � Construction Hand ook(Section 9-03.9(2)). I � i I We recommend th use of separation fabric such as TCi Mirafi 700X, Carthage Mills Carthage 6%, or eq�iivalent The cf�osen fabric and rock materiai should be reviewed and accepted by Hart C owser prior to vrdering. � I ' � Lat�er Earth and ydrostatic Pressunes ' � I � We analyzed the la ral earth and hydrostatic pressures assuming a scenario with � groundwater locate at the level of the proposed finished grade. The total lateral pressureI � to be used in desig depends on the rigidity of the structure (i.e.,whether the side walls of� � the structure wifl fle causing [ateral dispiacement into the structure) and rhe type of soil � used as backfill. W have assumed that the structure wili be rigid, with lateral deflection of the side waifs (ess an �_O1 times the height of the structure, and that structura! bacicfi{I wi�l ; � ►x►-�-�ee l i��.syrin r Kur� t�t I c:�R �T TLE. TO 94252518782 P.06 � I R� � �� I Puget Sound Electri ians Apprenticeship Training Trust 75C�8 ! April 26, 2001 Page�� ' i � be used as describe beiow. The tota! pressure exerted by the soil and grouncfwater can be estimated using an �qcaivalent flu;d density of 90 pounds per cubic foot (pcf}. � ; The equation to esti�r►ate lateral pressure in pounds per square foot (psfl is: I � I � � � 90( �+ z) � � � where: � . � j � i H�is the hei ht of soif above tt�e top of the structure in feet (mode1ed as a ; surcharge) � . � ; z is the dep below the top of structure in feei� � � � ; This ec�uivalent fiuid density may be reduced to 80 pcf if the wells are aElowed to yield ar � least O.i percent of heir height during backfil) pfacement. ! I i Hydrvstatic Upli Press�rres � i ; � � The hydrostatic upii t pressure (in ps� exerted on the bottom of the structure is estimated �o ? be the depth in feet of the bottom of tl�e slab (below the ground surface) times 62.4. E.g., ' the uplift force is es imated to be 750 psf if the structure base is i 2 feec belaw thE groundl � ' su rface. � � The structural engin.er may decide to bafance this hydrostatic csplift force by utilizing a � wedge �f soif aroun the perimeter of tl�e structure created by extending only the laterai I� I dimensions of the b se of the vault whife maintaining the design width and lengtfi of the I � actc�al sVucture. fn uch a case, it may be assumed that the wedge of soil to be utilized w'fl form an angle of ap roximate(y 63 degrees with the horizontal (i.e., 1 H:2V}. A soil density, of 125 pcf may be sed for the compacted structural fiii. � Structural Fill I � ! Soiis placed as bac sll arourrd and above the stormwater vault should be considered ! Structural FiIE. In th se fill areas, we recomrnend the following. � I � I I , YJ4-Cb-GCKJl 1G��rri rrtu-� w-+�� Kuw�titK 5tH I I Lt. TO 94252518782 P.07 I j I �r ' � � �I � Puget Sound Electri ians Apprenticeship Training Trust 75Q8 April 26, Z001 Page�6 I ; Generai Structur I Fi11 Criteria , � � The suitabiEiry of ex vated site soils for compacted structura! fi!I wil[ depend upon the gradation and moist re content of ti�e soil when it is pfaced. As tfie amount of fines (tt�at portion passing the o. 200 sieve) increases, the soil becomes increasingly sensitive to sm 11 changes in moisture content and adequate compacrion becomes more difficult to achieve. ' Soii containing mor than about 5 percent fines cannat be consiste�tly compacted to a I i dense non-yielding ondition when the water content is greater than about 2 percent abo e � or below optimum.. eusable soi! musi also be free of organic and other deleterious ! material. ' , � I Use of On�Site S i!s as StructuraN Fiil �I I In general, our exp( rations indicated that the on-site soils consist mostly of silt. The � majority of these soi s contain signifi�antly more than 5 percent fines and, therefore, will b I very moisture-sensiti e when they are wetter than optimum_ This could be.during periods f � i wet weather or, if g undwater contributes to their moisture content, even during dry � � weather_ Therefore, we anticipate that the native site soiEs could be difficult to place and j I compact as stru�tur I fill. We do not anticipate tt�e use of on-site sof}s for structural fill_ W , � recomrnend against ounting on the site soiEs for this purpose. I Selection of Im rted S�ructural Fiil ` I i For imported soil to e used as general structural fill, we recvmmend using a dean,well- � graded sand and gr e!with (ess than 5 percent by weight passing the No. 200 mesh siev � {based on the minus 3/4inch fraction of ti�e material). ! I ' Where draina e ma rial is re uired we recommend im ortin a weU raded fre�drainin g q , P , 8 � , sand and gravel wi less than 3 percent by w�ight passing the No. 200 mesh sieve (base on the minus 3/4in h fraction of the materiaf}. i i Placement and ompaciion of Structural Fill � I i Before fill control ca begin, the compactPon tharacteristics �f the filf material must be � determ;ned from re resentativve samPles of the structural and draina�e fill. Sarnples shoulc� be obtained as�soon as poss;ble prior ca placement of the fi!f_ A stucfy of compaction � characteristics shoul include determination of opt�mum and naturaf moisture contents of � these soils at tfie �m of ptacement. We make the fo(lowing recammendations: ! i , b4-Gb-�F9b1 1��4�h'r1 FidJM h�1RT Ct2l�J5ER SEATTLE. TO 94252518782 P.08 I � t1 � �r � P�get Sound Eiectri ans Apprenticeship Training Trust 750i8 April 2b, 2001 Paae':7 � i - i ■ Cont�ol the moi ure content of the f!! to within 2 percent of the optimum moisture_ � Optimum mois re is the moisture content corresponding to the maximum Proctor dryi ' density. � { a Place and comp ct aff structural fill ire {ifts with a foose thickness no greater than 10 � I inches. lf smali, and-operated compaction equipment is used to compact structurat fill, � ! fill lifts shouid n exceed 8 inches in loose thickness. ' ; I ' � Place subsequen• liffs oniy aher adequate compaction of previous fift�. lf a fiil s�rface i� � exposed and b omes saturated, dried out, and/or disturbed, mois#ure condition and ( recompact it I I i ■ As a rninimum, c mpact general structuraf fi11 around the concrete structure to 95 � ' '; percent of the m�ximurn dry density as determined by the modified Proctor test meth d j i (P,STM D 1557) except within 2 feet of the walfs where compaction should be (imited ! i ' to 92 percent us ng hand-operated equipment to avoid subjecting the walls to excessiv�e '� pressure �uring onstrt�ction). I i I ■ In wet subgrade eas, clean materiaE with a gravel conient (material coarser than a U.S. No. 4 sieve� of 3 to 3� percent may be necessary. i a Allow Hart.Cro er to review and accept any material proposed for use as structuraf fi�l j prior#o ordering � � � � � � � ■ Field test compa ed densities of all fifts to verily compaction. � ■ Prior to placeme t, determine the maximum dry density and gradation o#any material I ; proposed for us as structural fitl. ' � I CONSTRUC7lON CONSIDERATiONS , T'emporary Dewa ering I ; � ` Based on the conditi ns encountered during our fielcf explorations at the site, we anticipate : that groun�n+ater wi be encountered during excavadon and installation of tfie proposed stormwater vauft e estimate, based on the rype of soii and groundwater cond�tions i identified in our expl ratioris, that the rate of groundwater inflow wi11 be relatively minor. ; To effectively prapar the subgrade prior to the pEacement of tt►e concrete structure, the � I � I i � I e4-�-�eei i��4err� Fhtur� tiF�tl CtdJwStK SEATTLt. TO 94252518782 P.09 I � � I �/ i Puget Sound Electri ians Apprenticeship Training Trust 75C�8 � April 26, 2Q01 Pagei8 groundwater wilf ha e to be pumped out of the excavation. I� our opinion, dewatering fQ� this excavation can I kely be accomplished with simp{e system of trenches and sump pum�s. tf a reiatively clean ndy zane is encountered in the excavation, however, groundwater � inflows would be m re signift�ant � � � Temporary Exca tions � II Based on the propo ed design,we anticipate that the excavation wi(I extend about i 3 fee� below the existing g ade_ The stabiliry and safetjr of cut s(opes depend on a number of � Factors, including: � � T�te type and de�sity of the soil; � � I ■ The presence a amount of any seepage; . � � w Depth of cut; , ■ Proximity of the ut to any surcharge [oads near the top of the cut, such as stockpiEed ; material, traffic ( ads, structures,.etc. and the magnitude o#these surcharges; � i i ■ Duration of the pen excavation; and i s s Care and rneth s used by the contractor. � Occupational Safe and Health Administrat�on (OSHA) classifies the upper subsurface Fill; soils at the site as T pe C. For the Type C soii present at this site, tE�e maximc,rn allowabie j sfope for excavatio Sess than 20 feet deep is 1_5H:1 V. 7F�is is our recommenclation for � planning Purposes. � � i Sased on the above factors,we make the following recommenciations regarding open cut�: � � Protect the slop, from erosion by using plasdc sheeting; f . ; ■ Limit the maxirn m durat;on o#the open excavation to the shortest time period possib e; � � and � � � Place no surcha ge faads(equipment, materials, etc.} within 10 feet of the top of the ` siope. � i i I . i � I • I � f � b4-�b-�1 1��4aFT'1 FMJM F�T C�R SERI ILE. TO 94252518'782 P.10 . f � �1 i �� ' � Puget Sound Electri ians Apprenticeship Training Trust 7508I Aprii 26, 2001 Page'9 � Because of the va�;a fes involved, actua! slope vafues required for stability in temporary cut areas can oniy be 'mated prior to construction. We recommend that stabil'tty of the � temporary slo�es us d for construction be the responsibility of the contractor, since the contractor is in con oi of the canstruction operation and is continuously at if�e site to � observe the nature nd candition of ihe subsurface. Excavations should be made in � accordance with afl ocal, state, and federa! safety requirEments. ' I i � Construcfion Ac ess � � The contractor shott d be prepared to deal wiifi wet,soft conditions in tfie vauft excavaiion 1r�e expect that mo ility of typical construction equipment directfy on this subgrade may b� ' difficult �I I I RECOWIMEI�DA ONS FOR ADDITIONAL GEOTECHNICAL SERVICES � We recorrzmend the following: � � � I ■ As the project d sign stage progresses, allow Hart Crowser to review the finaf civii , design plans an specifications ta confirm that the geotechnical engineering � recommendati s have been properly interpreted and implemented into the design. � , ■ During the cons ruction phase of the project, retain Hart Crowser to observe: ' • Site prepara on aciivities; - � • Pfacement a d compaction o#structural fill induding testing of proposed flll ; materials an subgrades prior to placement of the fil(; and ' i • Other geote•hnical cansiderations that may arise during the course of construction� I I � � � I . � � I � � i � I I I ; i � : � I � : � ', t�4-Lb-L�1 1L=41h'1•i rKUPt tyH�1 �KUWStK 5tH I I Lt. I U y4�5251578� P. 11 i i �1 � � ' I I . .. . . I Puget Saund Electri ans Apprenticeship Training Trust 750i3 April 26, 2001 � Page 11J � The purpose of thes observations is to determine compliance with the design concepts, ; specifications, or rec mmendations and to allow design changes in the event that ; subsurface conditio differ from those anticipated prior to the start of construction. ; ' ; � i Sincerely, . j HART CROWSFR� �N . 3 � ' � ��Y � � �� 04 w �''�, i . �� ca � i � � � � �(z��o� � ; � �o � �w ; I '°�s A�rsTB �G�'� I i Sr�NAL � � ocPtR�s � r o � �� ). j�F�t�v WAGNE�, P.E. PAU!IAROSA ' Principaf Staff Geotechnical Engineer � � I Attachrnents: I i I , ! �igure 1 -Vicinity M p Figure 2 -Site ar�d ploration Plan � Figure A-1 • Key to ploration togs � Fgure A-2 -Test Pit og TP-1,TP-2, and TP-3 , � Figure A-3 -Test Pit .og TP�4 and'TP-5 ' f . i � F:\DocUobs\�508\PSEATT tormwaEer Vaultdoc I i , i i I i i I I � i i I I ! � � I ' i -' 6. 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F"' Ji'f,..- �1 �tl ' '_ _ ` ._ �.� .� s ��.� �� r ' � � 1 �`� � I. b+ _ � S{ 1.�,� �f4yYC�1 �f�, : i . < � �� .� � �t � .�� y •;' �[ � C^' �"'�^" ~"�_.,��N L��fL F+'�J�+M�*Y' .r,k t'kt �.�.�. k,' __'_'__"'_____'__.�__ . .. . ..._. . r'1 /� ��r�"� ~ � 1 ,� `Xr..�-x� Y�'�,-, � ^ea? �i T>1� iS T� �., . -�?- �`-r? t�1" � �V . - t �� ,m- '��'.s � 'L_'b ��_k� r"'r, 1 :._ � - } A4�� .._ s�. ': ; . �.. y , (1J �„aa�.�si y' �r y � .:i,,�-�,Sr� i � � ;r: g, --s-.f.,��..�,,.,.,, . -r^ r �- � k� � �i oil y� .W . � �IS��.t1' ��3� ��.0 .. ir :s4 z�,�-P� t 1 -s� . � .�.........-.._.._._.. � . � . .0 3 r.• -x ��"�.?. '3 � _ . � � i� � � ..:��'Y2�"f Y+- : .-�F � Y ti-r- .. �5 � ''' _ . � . . � 'a N ItYe'��' � i"ri wi�i� .lf1� _ �. �y.. �-*�-�� n, sr . +�f { .: m ,� s1� . �P �I �'�,q E -- �i ar ro� � 5-:'�}��'",3. ��` .�� 11�✓ �n F �,. � -��' � � ^�'�?r @ I, '� - :--� � �d � ~ ` � • ''{+� ^, 'V'.a ;"r sr"��2 ��Y�+eh�� ,tTr � •� �i._ Y�] .n. �Q'N r'd' +�,��, ..4. �." LF I �.j' Y{�-,:.��s""��1�,.?sr�y ��-�. ,` 4� z . ' ,z� k - t �^S;*.� � y +�.u��I `C'�_$�� L�� Q&/� � � .t �'� �+ � �. f T ?��'��-. �:�I 45t �� '�' �= ti3� c�rLrmro .cc fl f s.f�,: ,y�� t :��v�� ;�,.,>>`�..:� ...��. r, ..� �' . � � � - — - -� r"-'� y( l �� _ ��0� 7�� 'i� L�: . 'f��t .%,, y<.7!� '" ". "". .< /� . , . . , . . . ..... . ... �./� ♦��p�/� ,y VCV 4(�Zl'Y"`0 V l�/"Y � 1�4—�b—�1�1 1�=44F'M FRDM HART CROI.JSER SEATTLE. TO 94252518782 P.13 , � ; � � , ; ; , . � Site and �x Ior�fio� Plan i j � I i a ,3 � 1„ r �`. '.r 7_ :' '� .P ;� I ; r•.. � _ �� _ �,�� 'I _ � � I • 1,.' �`^`� ��_.,� �! p�� I � � �' • +CF`�F� ��"•��j v I .j V/ ��..y„� � I ,�5� - I� _•_ r �f�� , , - ., A i3 r `f��.+: �,.--.�-r, i- - ^f�pJ ? �`�,��`� �C;u;�,�,� � �- .� . � i - � � n I i �'��' � '�,�, .o�.� � . ,_-�: �. �,__� a: ,�. �? �` � s�` 'R�,,�,o�` � �: . , j . ' t=�; � , - � �� _ _ �� , F- . , . � J_ + i �� f`, .3 f_ � I I � ',3� , atC. A YDRM�� b . . � . . � 1f J� � � Su - -�ii 1"- I � ' . J! ~#Q , � � • I � ";k ��' � j I � S �i �+�� '{ l r I � " ;, , Proposed � o:,�_�� j ��; _ , Vault ��',��• ;G ,{1 � � �-4,.n . ;: I . � l] 18= � �� - • 2,�fq�•-- �- --. - ` --- I�T�2 Test Pit Location and Number ��— � � _ _ _ _.._�� 1 f�' � i �� ' �,�i� '��( { ; � � ��i ' t �, �I v� ;� � � , �; ; � � � ; G �:� � . � , I �� ,; � + , � � ��I � > � �r �� i ;t : Q � , - . �• ; ; µ }i� 3 �� ' �z.�� . � , , � ! � 'l � � k 1 ; � ' � �iI � � � � � ' � I ; Lt,t � I i �I� �� ; � ; �7 '--- -- ---- 1 � ; � I i �'.: '� i ' � � t I i � � ;; , �� L ��'C� � ; 6 . � �, , �� . ,.o ; ; � l� '•� q I ��; � .� v51. � � � � , 4� , ; � /� : � � I� •:� / ' Approximats Scale in Feet .K.� '�:. ,�: �y..cl�e_�1� 3,-._r� , �is ; � ! w�� '� I . � t � � � �� . : I � :� ; � � � , � � , � � � i{ � ! t . — � . � ; �j''�] . . � � �� i 1 � ��v � � ' - � i J-7508 • � /0� � � � � � • ; Flgure 2 ; � � , : I � � b4-Lb-�bbl 1��45�M FROM HRRT CROWSER SEATTLE. TO 94252518?82 P.14 � { I I I Ke to x lorafion Lo s � � ' Y 9 Sample Descript on I Classilication o( soils in thi report is based on visuol f9eld and laboratory ob5ervot�Ons whiCh �nclude dens�ty/coris�stency, ; mois[ure conditicwn, gr�� si e, and plaslicily estimates and should nof be constrNed to imply fie�d �Or Iabwotory teSt�ng' u��ess p�ese�ted herei . Vi fd-monuo� clossiEicotion metnods of ASTM D 2488 v�crc uscd as an identification qu�de. ! Sol description� consi t of the following: I Dcnsity/coRsislancy, m�istu o, co�or, minor cortstituents, MAJOR CONST1IUEN't, additionol remork3. Density/COnsist nc ! � ��rJ � .� 50l density/con�istenc in orings is reloted pr'm,orily to the Stondard Penetrot�on Resistance. � Soil dcrtsily/cortsist¢ncy in t sl pils is estimat¢d based on visuaf observation ond is�resented paren�heticolly pn the test pii (ogs. ( S ontle�a Stand rd Approximote I SAND or GRAVEI: P nctrotron SiLT or CLAY Pene ot;on Sheor Ri.sssta�ce (N) Rcsis�ncs (N) Stren th � Dens�ty '• �n, Blows/Foot ConsistCnGy in Bi s/Foot ;r, Y'S� ' Very loose , I 0 - 4 Very soft 0 � 2 G0.125 I Loose ,4 - 10 So/t 2 � 4 0.1�5- 0.25 � M�ivm eense 0- 30- Metl�um stiff 4 i 8 0.25 - O.S I i Dense O - 50 Stiff S i 15 0.5 - 1.0 ' I Very dense >50 Very stiff 15 � 30 1.0 - 2.0 � Hord >�0 >20 � � ; MOisture ; Minor Cons ituents Est;motee Percentoge; Dry Little pers,ceptbl moi�ture Not idcntified in ascription d - 5 Domp �mC pc(GCptibl rttO�Slule, probobly belvw optimum Slightly (Cloyey, �ilty, eit.� 5 - 12 Moist Probably'ncar o timu moisturC content Clayey, silty, sandy, grovelly 12 - 30 i i Wet Much pe�c�piibl mo�•ture, proba�iy obove oplimum Very (cloyey, slt�, ete.) 30 - 50 � � I Legends Tes# SymboMs ' i Sampling Test S A1�0�3 GS Grairt Siz Cfassification � BORING SAMPLES � CN Consdida on � + i � S ��t S ob� I �u Urtconsoli iated Undroined Trioziol D P ' � CU Consdidot�d Undro�neC Trioxiot � Shelby TuSe ( CD Consolido d Drained Triaxiaf � Cuttings � OD Uncon(ine�Compression I Core Run . DS Direct Sh or � m : • � � � o K Permeobl�y I > >k No.Scmplc R�c y � y PP POtke� Pc�ClromelEr P 1'u�e Pushed, N t Dr n . ApproximQte Compressive 5trength in,TSF , ' TEST PIT SAMPL'£S j , • TV Torvone { � � Grob (;lar) Approxim�te Sheur Strength in TSF ,n � C8R Colifornia �earing Rotio � � � Bog • ; � � : MD Moisture Oensity Relotip��ip � r � Shelby �ube AL Atterbe�g(Limits � « W : �' �� Water Content in PerCe�t ' � I L Liquid Limi� � � Groundwat�r Ob er ations �� Nat�,a I < QSul4oce al Plostic Lirt+it � j y . � PIp Photo�on�zot�on Detector t2eoding n Bentonitel I CA Chem�col Anolys�s � DT fn Situ Ocn�sity Test :' Groundwa er L veE on Dote or „'.'� - � � ATp '; ot `Time f D illinq (ATQ� �� I � We�l. $Crg n � �� i : I � ` Sn d PQC�C I ��r.. � No ivC Ma.wiary --"-" ��O I � � —Gr unCwolcr SGepage (Test p�ts) � J-7508 ' 4�/Qi g � Figure A-1 � � . i _...�.._ . i I I � � I � . , , e4—�b—�ee1 1��4� FF�1 HRRT CKOWSER SEATTLE. TO 94252518782 P.15 ^ � Test P�f:Lo P�1 I Sample `Water Deptt� SOlI DESCRIPTIONS I I �Content� M�set (SoR),moist,brown,stightly I�andy SILT wi�h organic mate�Sal. S-1 4'f 1 2 (Medlum stif�,maist,brown�nd gray with orange mottiing,slightty sandy SlLT S-2 52 3 with organic material. i 4 � i (Medium stilfito sfiff),moist 9ray and brown with orange moti!ing,clayey S�IY S-3 50 5 with abundant wood pieces.I g (Medium stiif},wet,daiic grai.f�ne sandy SILT. S-4 39 � 8 Q ' 9 Bot�om of Expbration at 9_0 eet � �� Completed 12IQ1/00. i 12 � �I � ! I • I i Test Pi# Lo P-� ; s�nae ,w�c�� o�n so�oEsca�r�oNs � ;corxeeu m�sec i � (Soft),mast,Rght brown,51't�h�y sarltly S L wiih ab�ndant organic materl�l. � S-1 29 � 1 � z � I 3 (Loosa to medium dense),d�mp,very slty SAND with interbedded S1LT and S-2 30 � 4 organic materlal. I g.3 g B (Loose),dry,gfay and browrl,fine SAND. (Medium stiff to stif�,mois#,�qray with orange rriottling,slighi�y sandy,dayey � SILT with wood debris. � 3-4 62 j B � 9 � Boitom of Exptoration at 9.0 Fe�. 10 CompEeted 12IU1/00. I i � 12 I � � I ! � I Test Pit Lo P-3 � � samp� �w�� oe�n soa oescwPrroNs � � C�onterK In�est � , (Sofl),moist,6yht brcwr►,sN,�t 58ndy SlI.T wiSh abundant organic mate�ial. I p � � o��' S-1 � 30 2 � � 0 3 U' , � 4 ; a 5 (Mediuri�st� moist gray id BgM brawn with orange mottling,slighUy santly o � 8 SILT wlth organic material. i � � S4 ': 38 7 ' "' ; 1 8 � I � a i � 9 � �' � . 41 Zp Medium stlft tn sti mois I ht wifh ora matt6 c�a SILT. I o �� Bottom of Exploration at 10.q Feet . � Completad 12/01100. I � . 12 � . � � I /� 1 S• . � I , 4.Refer to Fiyure k• tor explanetion of desaiptions a�d symDds. � z_sou7 descriPtrons a e strac„ir,ui,e�are ir►terpret;ve;t,d acaral cnangas may J-7508 9 0 be�adua�. FI ur+e A-2 3.Gro�rM cond�tions if indicateQ.a}e at tir»e of e�orevetion. Coodidons may � vary witn time. � I • I � ' I ' i � � ( I rKi-Lb-LYJVJl 1��brri rrtur� rq�i c;ttu,�tK 5tH t TLE. TO 94252518782 P.16 . 1 ' ' i Test P�t�Lo P-4 , i Ssmple ' Weter Depth SOIL DESCRIPTIONS i Co�4ent in Feet 0 ' g� 37 [ � (�Soft��iu�m stif�,mois�daric brorvn,sC�ghfy sandy SILT,with abundar�t �2 ' 15 � . 3-3 24 � 3 (Loose).moist,brvwr►and gtay,fine to medium SAhID. (Soft),damp,6ght hrvwn an�l�gM gray with orange rnottling,s�ightty sandy S� 35 4 g��. I S-5 3s 5 (Meafum sstf�,moist to wet,ar�y wlm orange rrwttdng,sligt„y sandy, ayey � ' � 8 SILT wiih some or anic mate�al. � 7 (Medium stiF�,moist to wei, ark gray 3RT. ( 8 : 9 • ,o y � sottom or Explorat;«�at 1o.a Feet. 1� Completed 12JU1100. � � 1 12 � � � � Test Pif Lo� P-5 ' � � Sample Water ( Depth SOII DESCRIPT10N3 i Content in�Feet � �� (Soft to med'ium sfif�,moist,ldark brown,slightly sandy SIIT with abundant 1 ic matecial. S'2 S 2 oose rt�ois r and brown fine SAND. S"3 2° I 3 (SoR to med'n,m stirf�.ary to�amP,ligr►t brown witt,oranye mo�ing.Slightly � 4 san SIIT. (Mediurn stiff to stiff),moist we�gray with orange mottling,clayey SILT with � S-4 38 I 5 organic material, � 6 � i I y I �� $ (Medium stif�.wet,dark gra�,fine sandy SILT. S-s a5 9 I �a y ca��n9 i 11 Bovcm ot F�cpioration 8t 10,Q Feet. 12 Completed 42101/OQ. � � I I I ; . 1 � � I � I 4 ' ; � � � � � a' I � ' I ! � ( I a � � I � I � I f� : j 1,/ ; � ' � � N�� 1.Refer to Figure A-�tor exp�irt '�n of desaiptions and SymDds. z.so-r aes«spsorm�,a stracum��are�nte�pre+;�+e and ac�,al a�gss may J-7508 12/�0 ��. I Fi ure A-3 I a_Grrn,rxi conditlor►s I if i�ea,s�e at time of excavation. c�tans may I 9 vary wilh time. , I ; i I � .f ; I i I TOTAL P. 16 L!1 'Q � � � � a � O U � � I � � � I �A I � �' � VII. BASIN AND COMMUNITY PLAN AREAS The project is located within the Green River Drainage Basin. The community plan area is called"Green River Valley." I 7976.003[DED/mm/kn] . , .: , : . : ;-- . 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"-'!�'�''' _....%' � ,•� � '' � �—�.�2 �r ^ , . c-' ,�_ � � � ,,N .�.;� - ,� �, V1 N ' w � � � N � � � � VIII. OTHER PERMITS At this time,the pemuts anticipated for this project are as follows: • Roadway and Drainage Construction • Grading Permit IX. EROSION/SEDIMENTATION CONTROL DESIGN _ _ � IX. EROSION/SEDIMENTATION CONTROL DESIGN The limits of clearing have been shown on the construction plans to encompass the entire site area. Silt fences have been shown on the plans to protect the adjacent properties from any possible sediment runoff. Since the site is only approximately 2 acres in size,and currently infiltrates all on-site stormwater,we do not feel that it is necessary to provide any form of sediment traps or ponds. As construction progresses,silt fences will be maintained,and catch basin protection will be installed to ensure that all stormwater leaving the site is clean and free of sediment. Once the underground detention vault is installed,it will act as a sediment trap,which will ensure that not sediment laden water will leave the site. 7976.003[DED/mrr✓kn] X. ADDITIONAL DOCUMENTS X. ADDITIONAL DOCUMENTS A. RETENTION/DETENTION FACII..ITY SUMMARY SHEETS AND SKETCI�S 7976.003[DED/mm/kn] K1NG COU �ITY, WASHINGTON, SURFACE WATER DESIGN MANUAL RETENTIONIDETENTION SUMMARY SHEET Development Pu(��t,T �rsvr�i� �l.ft'(7Lt�AL �PPI�f,nrflCE..SFf7P Date ��s� � 1 Pcr� '��k7rJ1�b PtzO Location �✓• W� 1� �� £- • ENGINEER � DEVELOPER Name F'f'�- �� Name �I�-i— ��s£�2- Firm t3P�6H'�tvS�r,�J Firm �'U�i4-T fDUNt��t�G'f(LiGA-t� p�R-E��cr'!C£SNP Address ��Z-�5 72►sD /�� s Address �J�DD b�hV�S. S�IT� Zc�O T t�f.NT" �, 9&032 5�� u-�� 9�i o� Phone �5 - �✓1 -622Z Phone �b -��3 -�"15S • Developed Site Z� Z acres Number of Lots � • Number of Detention Facilities On Site � • Detention provided in regional facility 0 Regional Facility bcation � No detention required � Acceptable receiving waters • Downstream Drainage Basins Immediate Major Basin Basin A �'�l�J �V�._ Basin B - Basin C Basin D " TOTAL INDIVIDUAL BASIN Drainage Basin(s) � �' B C D Onsite Area 2.21 2.21 _ ^ Offsite Area v��. ��.� - . Type of Storage Facility ' LiveStorageVolume �v ��3D �,�� I � Predeveloped Runoff Rate 2 year �� _ 1�year o.5c�I '� Postdeveloped Runoff Rate 100-year �•5�$ � � 2year o.qg8 I 10 year �� 5i� � Developed Q 100 year 2•�I�- � Type of Restriction �i�� I ' Size of Orifice/Restr'�ction �, • Orii'�celRestriction No.j 2 ��g,� - _ � No.2 3� � No.3 ; No.4 � No.S XI. MAINTENANCE AND OPERATIONS MANUAL K 1 N G C <) U N 'I' Y, W �� S H ( N G 'r O �, S U !t I� f� C L W n T E FZ [� G ti I G N M �\ ,J U A l. MAlNTENANCE REQU(REMENTS F�R PRIVATELY MAINTAiNED DRAINAGE FACILITiES NO. 1 - PONDS Maintenance Condltlons When Melntenance Reaults Expected Compo�e�t De(ect Is Needed When Malnte�ance Ic Perlormed General Tresh&Debris My trash and debris which exceed 1 Trash and debris cleared Irom site. cubic foot per 1000 square feet (this is about equal lo the amount of trash it would take 10 till up one standard size oftice garbage can). In general,there ' shoutd be no visual evidence ot dumping. � Poisonous My poisonous vegetation which may No danger ot poisonous vegetation where Vegetetion constilute a hazard to County personnel County personnel or the p�blic might or ths public. Exnmples of poisonous normally ba. (Coordinetion with vegetation include: tansy ragwoR,poison Seattle/IGng County Health Oepahment) oak,slinqing nettles,devils club. Pollution Oil,gasotine,or other contaminants of No contaminants prasent other than a one gallon or more o�any amount tound sur(ace film. (Coordination with ihat could: t)cause damage to plant, Seattle/}Gng County Health Department) animal,or marine lite;2) constitute a fire hazard; or 3)be tlushed downstream . during.rain storms. Unmowed Grass/ H taciGty is located in private residential When mowing Is needed,grass/grovnd Ground Cover area,mowing is needed when grass cover should be mowed to 2 inches ln - exceeds 18 inchas in height. In other height. areas,the genaral poficy is to make the pond site malch adjacent ground caver � and tenain as bng as there is no interference with the tunction of tha lacility. Rodent Holes My evidence of rodent holes if facility is Rodants destroyed and dam or berm acting as a dam or berm,or any ev�dence repaired. (Coordinatiort with SeatUe/ of water piping ihrough dam or berm via Krng County Fiealth Department) rodent holes. . Inseds When insects such as wasps and hornets Insects desVoyed or romoved trom site. intertere with maintenance activities. Trae Growth Tree growth does not allow maintenance Trees do noi hinder mai�tenance axoss or inlerieres with maintenance activities. Selectively cxiltivate Irees such activify(.e.,slope mowing,silt removal, as alders fw firewbod. vactoring or equipment movements). N . trees are not interiering with access,leave trees alone. Side Slopes ot Erosion Erodad damage over 2 inches deap $lopes should be stabilized by using Pond where causs oi damage is still present or approptiate arosion oonuol measure(s): where there is potential for continued e.g.,rock teinforcement,ptanting ot erosion. grass,compacUon. Storage Area Sediment Accumulated sediment Ihat exceeds 10% Sediment deaned out to designad po�d o(lhe designed pond depth. shape and depth;pond reseeded if necessary to control arosion. "n^'� �kc� �^•��^�^^^•^ r^y pa�' �. _._. . ..,,.. , _._ ��::,�;: : u��u ai�ou�U uu UWII UBCK l0 lllb OCS�aII inches lower than the design elevation. elevation. Emergency Rock Missing Only one layer ol rock exists above native Replace rxks to design standards. Ove�llow/Spillway soil in area five square feet or larger,or any exposure of native soil. ' , - � :�.-i i%/li IC I N G C' C� U 1�' l' 1', �1- A S I1 I N G "i' O N, S U R l� n C E W i1 'I' L h l� I� S 1 C� �` 1�4 �\ N U A L NO. 2 - INFILTRATION Mafntenence CondlUons When Malnte�ance Resutts Expecled Component Defecl la Nssded When Mal�tenance Ia Perlormed General Trash 8� Debris See 'PonCs'Standard No t See 'Ponds Standard No. � Poisonous See 'Ponds Sta�dard No. 1 See'Ponds Standard No. i Vegetation Pollution See 'Ponds'Standard No. 1 See"Ponds Slandard No. 1 Unmowed Grass/ See 'Ponds'Standard No. 1 Sae'Ponds Standard No. 1 G�ound Cover Rodent Holes See'Ponds'Sta�dard No. t See'Ponds Stand�rd No. 1 Insects See'Ponds'Standard No. 1 See'Ponds Standard No. i Storage Area Sediment A percolation test pil or test of facility Sediment is removed and/or tacility is indicates facility is only wor{cing at 90%of deaned so lhat infiltraCwn system wotks its designed capabitities. according to design. :I�eet Cover Sheet cover Is visible and has more than Shaet oover repaired or replaced. (It Applicable) thrae t/4inch holes in it. Sump Flled With My sediment and debris frlling vault to qean out sump to design depth. Sediment and t0%ol depth trom sump bottom to Oebris (H bottom ot ouUet pipe or obstructing f{ow Applicable} into the connectot pipe. Flter Bags Flled with Sediment and debris fill bag mora than Replace tilter bag or redesign syslem. Sediment and 1/2(ull. Debris � Rock Flters Sediment and By visual inspection little or no water Replace gravel in rxk filter. Debris Flows through filter during heavy rain storms. � �� I A-2 � 1/� K 1 NG COUNTI', �VASHtNGTON, SUit FACL W .4 "fER DESIGN MA Nl� � L NO. 3 - CLOSED DETENTION SYSTEMS (PIPES/TANKS) I Melntenance Condltlo�s When Malntenance Results Expected Component Defect Is Needed When Melntenance Is Performed Slorage Area Plugged Air Vents One-hali of the cross section ol a vent is Vents Iree of debris and sediment. blocked at any point with debris and sediment. Debris and Accumulated sediment depth exceeds All sediment and debris removed irom Sediment 1096 0l the diameter ol the storage area storage area. for 1/2 length oi stora9e vault or any point depth exceeds 75% of diameter. Example: 72-inch storage tank would , requlre cleaning when sediment reaches deptFi ot 7 inches tor more than 1/2 length of tank. - Joints Between My crack allowing material to be All joints between tank/pipe sections are Tank/Pipe Section VanspoRed into facility. sealed. � Tank/Pipe Bent My part o(tank/pipe is bent out of shape Tank/pipe repaired ot replaced to design. I Out ol Shape more than 1096 0(its design shape. Ma�hole Cover not in Place Cover is missing or only pariiatly in place. Manhole is closed. My open manhole requires maintenance. Locking Mechanism cannot be openad by one Mechanism opens with proper tools. � Mechanism Not maintenance person with propec tools. Working Bolts into Irame have less than 1/2 inch ot lhread (may not apply to selt-locking lids}. Cover DiHic�lt to One maintenance person cannot remove Cover can be removed and reinstatled by I Remove lid aRer applying 80 pounds ot lift. Intent one maintenance person. � is to keep oover irom seali�g ott eocess � to maintenance. Ladder Rungs lGng County Satety OHice and/or Ladder meets design standards and Unsafe malntenance person judges that ladder is allows mainlenance persons safe access. unsa(e due to missing rungs. mfsalignme�t,rust,or cracks. Catch Basins See'Catch Basins'Standard No. 5 See 'Catch Basins' Standard No. 5 A-� 1jit1 til NG COUNTY, �YASHiNGTON, SUKFACE WA "I' ER I� ES1G N MAN UA t. NO. 4 - CONTROL STRUCTURE/FLOW RESTRICTOR Mnlntenance Conditions When Malntenance Resulta Expected Component Defect Is Needed When Mefntenance la Per}ormed General Trash end Qebris Distanu between debris build-up and All lrash and debris removed. (Incl�des bottom ol ori(ice plate is less than i-1/2 Sediment) feet. Structural Damage Strudure is not securely nriached to Structure securely atiached to wall and manhole wall and outlet pipe structure outiet pipe. should support at least 1,000 pounds ot up or down pressure. Structure is not in upright position (allow Structure in correFt posilion. up to t0%from plumb). - • Connections to oullel pipe are not Con�ections to outlet pipe are watertight; watertight and show signs o1 rust. structure repairad or replaced and works as dasigned. - Any holes—other than designed holes— SVucture has no holes other than in the slruduro. dasigned holes. Cleanout Gate Damagad or Geanout gate is not watertight or is Gata 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 gata fs missing or Chain is in place and works as designed. damaged. Gate is rusted over 50%.of its w�face Gnte is cepaired ot reptaced to meet . nrea. design standards. �Orifice P1ate Damaged or Contrd davioe is not working proparty Plate is In pince and works as desi9ned. Missing due to missing,out ot plaoe,or bent � orifics plata. _ pbatruct;ons My Vash,debris,aediment,or vegetation Plate is fres oi ntl obstructions and wotics blxking the plata. � as designed. Overtlow Pipe Obstructio�s My trash or debris b{odcing (or having Pips is free ot atl obstructions and worfcs the poiential o(blocking)lhe overflow as designed. ' piPe- Manhole Sae'Closed Oetention Systems'Standard Ses'qosed Detention Systems'Standard No.3. No.3. Catch Basin See 'Catch Basins'Standard No.5. See'Catch Basins'Standard No.5. i �_ ' ,�_� 1/90 K1NG COUNI' l', \VASHING 'rnN, SURFACE ��' :� TL- R DESIGN MANUAL NO. 5 - CATCH BASINS Melntenance Condltlons When Malntenance Results Expected Component Deloct Is Needod When Malntenn�ce Is Performed Ge�eral Tiash & Oebris Trash or debris ot more than 1/2 cubic No trash or debris locafed immediatefy in (Includes �(oot which is located immediately in (ront Iront ol catch basin opening. Sediment) of the catch basin opening or is blocking capacity ol basin by more than 10%. Trash or debris (n the.basin)that No trash or debris in the catch basin. exceeds 1/3 the depth irom the bottom of bas�n to invert of the lowest piFe �-'- or out of the basin. Trash or debris in any inlet or outlet pipe Inlet and outlet pipes iree of trash or blocking more than 1/3 ot its height. debris. �ead animals or vegetalion that could No dead animals or vegelation 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 suppoR the breeding of i�sects or rodants. Structural Damage Corner o(frame extends more than 3/4 Frame is even with curb. � to Frame and/or inch past curb tace into the street (f Top Slab applicable). Top slab has holes larger than 2 square Top slab is tree of holes and ctacks. inches or ciacks wider than 1/4 inch (ntent is to make sure atl material is running into the basin). Frame not sitting flush on top slab,i.e., Frame is sitti�g tlush on top slab. , separation ot more than 3/4 inch of the irame trom the top slab. Gacks in Basin Gacks wider than 1/2 inch and bnger Basin ceplaced o�repaired to design Walls/Bottom than 3(eet,any evidence of soil particles standards. entering catch basin thro�gh cracks,or maintenence person judges that structure � is unsound. Gacks wider ihan 1/2 inch and longer No cracks mors than 1/4 i�ch wide at the ' than t foot at the joint ot any inlel/o�slet jant o(inlel/outlet pipa. pipe or eny evidence ot sal particles entering catch basin through cxacks. - Senlement/ Basin has settled more than 1 inch or has Basin replaced or repaired to design Misalignmenl roteted more than 2 inches out of standards. ' alignment. Fire Hazard Presence ot chemicals s�ch as natural No 1lammable chemicals present. gas,oil,and gasoline. Vegetation Vegetation growing across and blocking No vegetation blocking opening to basin. more than 1096 of the basin opening. Vegetation growing in inlet/outtet pipe No vegetation or root growth presant. joints that is more than six inches tall and loss�nan��x�n�nes apart. Pollulion Nonflammable chemicals ol more than No pollution present other than surface 1/2 cubic foot per three feet ot basin film. length. , A-5 1/9U F� 1NG CUUN "I' 1', \�' nSHINGTON, SURFACF� \VA "1' E: t2 DESIGN MANUAL NO_ 5 - CATCH BASINS (Continued) Malntenence CondlNon�When Malnte�ance Reeults F�cpected Component De(ect I� N�sd�d When Malntenence is Performed Catch Basin Cover (;over Not in Place Cover is missing or only pertially in place. Catch basin cover is closed. My open catch basin requires mainlana�ce. Locking Mechanism cannot be opened by one Mechenism opens with proper tools. Mechanism Not maintenance person with proper tools_ Working Bolts into frame have less than 1/2 inch ol Ihread. Cover Difficult•o pne maintenance person cannot remove Cover can be removed by one Flemove lid after applying 80 Ibs:ot lift; inteM is maintenance person. keep cover from sealing oH access to meintenance. Ladder ladder Rungs Ladder Is unsate due 10 missing rungs, Ladder meefs design standards and Unsafe misalignment,rust,cracks,or sharp allows maintenance person safe access. edges. - Metal Grates Grate with opening wider than 7/8 inch. Grete openings meet design standards. (i applicabla) Trash and Debris Trash and debris that is blocking more Grate tree of Irash and debris_ than 2096 of grate suriace. �amaged or Grate missing or broken member(s)of Grate is in place and meets design Missing the grate. standards. � .� r, 1/9(1 KING COL► N1' l', \VASHINGT� ON, SUR T= ACE WATL- R DESIGN MANUAL NO. 6 - DEBRIS BARRIERS (e.g. Trash Racks) Melntenance CondWons When Mal�tenence Resulis Expected , Component Defect Is Needed VJhen Malntenence Is Performed I General Trash and Debris Trash o� debris that is plugging more Barrier clear to receive capacity flow. than 2096 of the openings in the barrier. Metal Dameged/ Missing Bars are bent out ot shape more than 3 Bars In place with no bends more than Bars inches. 3/4 inch. Bars are missing or entire barrier is Bars in plaoe according to deslgn. missirg. Bars are loose and rust is causing 50% Repalr�w replsoe barrier to design deterio�ation to any part ot barrier. standards. �_� 1/`JU K I N G C O U i'� 1' 1', 1V n S H 1 i� G T O N, S U R F A C E W �\ "I t: f2 D L= S I G N M A N U F� ; NO. 7 - ENERGY DISSIPATORS Malntenence Conditlona When Malntenance Resutts Expected Component Dafect Is Needed When Malntenance Is Pertormo 1 Extemai Rock Pa� ,.�,,sing or r.,�.ao �n�y one tayer ct rocK ewsts auo�:a natr:c ��x��.e roi.n5 t� �;e�_ � � � Fock soil in area five square feet or larger,or any exposure o(native soil. Oispersion Trench Pipe Plugged with Aocumulated sediment that exceeds 20% Pipe cleaned/flushed so thai it matct Sediment of the design depth. design. Not Oischareing Visual evidence ot water discharging at Tranch must be redesiqned or rebu�' Water Property concentrated points along trench (norrr-' - -- � � condition is a'sheel tlow'of water alo trench). Intent is to prevent erosion damage. Perforations Over t/2 of pertorations in pipe are PIu99ed plupged with debris artd sediment. Water F!,,ws Out Maintanance person observes water Faci►ity must be rebvilt or redesigned to Top oi'DisUibutor' Ilowing out during any storm less than standa�ds. Catch Basin the design storm or it is causing or appears likely to causa damage. Receiving l�ea Water in receiving area is causing or has No danger o(landslides. I Over-Salurated potential ot causing landslide problems. Internal: Manhole/Chamber Wor�ot Damaged SVucturs diuipating ilow deteriorntes to Replace structure to design standards. Posts, Batfles, 1/2 or originat siza ot any ooncentraled - Sides ot Chamber worn spot exceeding one square foot which would maka structure unsound. Other Defects Sae'Catch Basins'Standard No.5 See'Catch Basins"Standard No.5 n o l/9n K ] N G C O U �! 'l� �� ,� ;�_ �: i� 1 �: <: T n N C � � R F ,� r� r� V,� ��. �r F R i� F S 1 �; ^1 *+ �._ �J T I � NO. 8 - FENCING Malntenance Conditlona When Malntenance Re�ults Expected Component Defecl Is Needed Whe� Mnlntenance Is Performed General Missing or Broken My defect in the fenca that permits easy Parts in place lo provide adequats , � Parts entry to a facility. security. Parts broken or missing. Broken or missing parts repinced. Erosion Erosion more thnn 4 inches high and 12- No opening under the lenca that exceeds 18 inches wide permitting an opening 4 i�ches in height. under a fence. Wire Fances Damaged Pans Posts out of plumb more than 6 inchas. Posts plumb to within 1-1/2 inChes. Top cails bent more than 6 inches. Top rail tree ot bands greater than 1 inch. My paA ot(ence (ncluding posts,top Fence is aligned and meets deslgn rails,and fabric)more than 1 foot out ot stnndards. design alignment. Missing or loose tension wire. Tension wire in Place and holding fabric. Missing or loose barbed wire that is Barbed wire in place with less than 3/4- sagging more than 2-t/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. Iaiger than 3/4 inch. Deceriorated Paint PaR ot parts that have a rusting or scaling Structurally adequate posts o(parts wiih or Protective condition that has aHected structural _ a uniform protective ooating. Coating adequacy. , Openings in Fabric Openings in fabric are such that an 8- No openings in fabric. inch-diameter ball cou{d fit through. A-% t,'.v KING CUUNTI', WnSf� ING "T' ON, SURFACE WATL= R DGSIGN �tAN U � L NO. 9 - GATES Malntenance Condltlona Whon Maintenance Reaults Expecled Component Def�ct Ia Nseded When Malntsnance Is Performed General �amaped or Missin9 gate or locking devices. Gates and locking devices in place. Missing Members - &oken or missing hinges such thet gate Hinges inlact end Iubed. Gate is working ca�not be easily opened and closed by a Ireely. mnintenance person. , Gate is out of plumb more than 6 inches Gate is aligned and vertical. and more than t (oot out ol desipn alignment. Missing stretcher bar,stretcher bands, Strelcher bar,bands, and ties in place. � nnd ties. Openings ln Fabric See 'Fencing'Standerd No.8 See'Fencing' Standard No.8 . .,. ., .. KING CUU �` TY, �L' ASHINGTON, SURf= ACE WA �' ER DESIGN MANUAL NO. 10 - CONVEYANCE SYSTEMS (Pipes & Ditches) Malntenance CondlUons Whan Malntenence Resulis Expected I Component Defect la Needed When Mafntenance la Pertormed Pipes Sediment�Debris Accumulaled sediment thal exceeds 209i, Pipe cleaned ot all sediment and debris. of the diemeter of the pipe. Vegetation Vegetation that reduces free movement of Ail vegetation removed so watar tlows water Ihrough pipes. Ireely through pipes. Oamaged Protective coating is damaged; rust is Pipe repaired or replaced. causine more than 5096 deterioralion to any part o(pipe. , My dent that decreases the cross section Pipe repaired o�raplacad. area ot pipe by more than 20%. Open Ditches Trash �Debris Trash and debtis exceeds 1 cubic foot Trash and debris clearad from ditches. per.1,000 square feet o}ditch and slopes. Sedimenl Accumulnted sadiment lhat exceeds 20% Ditch clenned/flushed of all sedimsnt nnd ot ths design depth. debris so that it matches design. Vegetation Vagetation thnt reduces irea movement oi Water flows lreely ihrough ditchss. water through ditches. Eroslon Damage to See'Ponds'Standard No. 1 See 'Ponds'Standard No. 1 'Slopes Rock Lining Out oi Maintenance person can see native soil Replace rocks lo design stnndard. Place or Missing (N beneath the rxk lining. Applicable) . `� Catch Basins See'Catch Basins'Standard No.5 See'Catch Basins'Standard No.5 Debris Barriers See'Debris Barriers`Standard No.6 See'Debris Barriers'Slandard No.6 (e.g.,Trash Rack) I , _ � A-11 1/90 � KING CO U NTY, �VASHINGTON, SURFACE WATER DESIGN MANUAL NO. 17 - GROUNDS (Landscaping) � Maintenance CondlUons When M�intenence Resutts Expected Component Defect I• Needed When Malntenance is Pertormed General Weeds Weeds erowing in more than 20%o( tha Weeds present in less than 596 0l tha (Nonpoisonous) landscaped area {trees and shrubs only). landscaped area. Salery Hazard Any presance of poison ivy or other No poisonous vegetation present in a poisonous vegetetion. landsceped area. � Trash or Litter Paper,can, bottles,totalling more than i Area clear o(litter. cubic toot within a lendscan?d erea (treos and shrubs only)of 1,000 square feet. Trees and Shrubs Damage limbs or parts ol tiees or shrubs that nre Trees and shrubs with less than 5%of tha split or broken which aNect more thnn total folinge with aplit or broken limbs. 25%o(the total foGage of the tree or shrub. Trees or shrubs that have been blown Tree or shrub in pince tree of injury. - down or knocked over. Trees or shrubs which ars not adequately Tree or shrub in place and adequately supported or are leaning over,causing supported;remove any dead or diseased - exposure oi the roots. irees. !1'jL I/�!J �: ING COUNTY, WASHINGTUN, SURFACE WATER DESIGN MANUAL NO. 12 - ACCESS ROADS/EASEMENTS Malntenence Conditlons When Malntenence Resutts Expectsd Component Defect li Needed When Maintennnce Is Perlormed General Trash and Debris _ Trash and debris exceeds 1 cubic toot Trash and debris Geared (rom site. per t,000 square feet,i.e.,Irash and debris would fill up one standard size garbage can. Blxked Roadway Debris which could damage vehicle tires Roadway free of debris which could (glass or metal). damaga tires. My obstructions which reduce clearance Roadway overhead clear to 1�leet high. above road surtace to less than 14(eet. ` My obstructions resUicting the access to ObsUvciion removed to allow at least a a 1U-to 12-foot width tor a distance of 12-foot access. more than 12 teet or any poi�l resUicti�g access to less than a 10-toot width. - Road Surface Settlement, When any surlace de(ect excaeds 6 Roed su�face unitormty smooth wilh no Potholec, Mush tnches in depth and 6 squa�e teet in area. evidence of settlement,potholes,mush Spots,Ruts In general, nny suAace defect which spots,or ruts. hinders or prevents maintenance access. Vegelation in Road Weeds growing i�the road surface that Road surface iree ot weeds taller than 2 Surtace are more than 6 inches tall and less than inches. 6 Inches apart within a 40asquara-toot . area. Shoulders and Eros(on Damage Erosion within 1--toot of the roadway more Shoulder iree of erosion and matchin� Ditches than 8 inches wide and 6 inches deep. the surrounding road. Weads and &ush Weeds and brush exceed 18 inches in Weeds and brush cut to 2 inches in I height or hinder maintanance access, height or cleared in such a way ns to allow maintenance access. A-13 ��