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/LLS GC)ZJ cc- sw 7 -77 • • • •• •• •• • • • • • • • • • MAY2ozoi6 • •. •ClT .OF xIGARD : : :• . 9«�1.i� 'nP� ISLON • • • • •• • ,� SW 79th DRAINAGE '•• •• • •• .•. Address: 15630 SW 79th, Tigard •• •• • • • • • • • • Date: June 7, 2016 ' theta NARRATIVE: uc An on-site infiltration test was conducted January 28, 2016 after it was presoaked on January 27, 2016. The soils were found to be moist without any seeps or ground water. Three successive tests were conducted with the final test filtration rate of 1.75-inches per hour. Using a safety factor of 2 a 0.875 inch/hour was used in the sizing calculations. There are two tax lots at this site with an existing house reported to have a roof area of 2830 sq ft (0.06acres) and a new house being constructed with an roof area of 2300 sq ft. (0.05acres) Both properties slope away from the street and therefore on-site disposal of storm water is proposed. Calculations REFERENCE: The King County Department of Public Works, Hydrographic Program, ver 4.21B and using a 20year event of 3.2 inches/hour. Lake Oswego Stormwater Management Manual, July 2015 Xxxxxxxxxxxxxxxxxxxxxxx S.C.S.TYPE-1A DISTRIBUTION xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx XXXXXXXXXXXX 10-YEAR 24-HOUR STORM xxxx 3.20"TOTAL PRECIP. Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ENTER:A(PERV),CN(PERV),A(IMPERV),CN(IMPERV),TC FOR BASIN NO. 1 0.0,86,0.06,98,5 DATA PRINT OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) 1 • •• •• • • • • • •• ••. •• • •• • •• • • •• • • • • •• ••• •• • • •• • •• ••. •• •• • •• •• • •• • • •• • •• •• •• • •• •• .• •• ••• • • • • •• ••• • • • •• • • •• ••• • • • • • • •• • •• •••• • •• • • •••• •A CN A CN '•' '•' ••• • ••• •'• ' .1 .0 86 .1. 98 5,0 ••• ••• • • •• •• • • PEAK-Q(CFS} T-PEAK(HRS) VOL CU-F,) • •• • •• • • ••• • • .05 7.67 646 ENTER(d:}[path]filenamej.ext] FOR STORAGE OF COMPUTED HYDROGRAPH: C:sw79 SPECIFY: C-CONTINUE, N-NEWSTORM, P-PRINT, S-STOP ENTER OPTION: 4 RESERVOIR ROUTING INFLOW/OUTFLOW ROUTINE SPECIFY jd:]jpath]filenamej.ext}OF ROUTINE DATA C:swdata DISPLAY ROUTING DATA (Y OR N) ROUTING DATA: STAGE (FT) DISCHARGE(CFS) STORAGE(CU-FT) PERN-AREA(SQ-FT) .00 .00 .0 .0 .50 .00 42.7 206.4 1.00 .00 117.1 206.4 1.50 .00 188.1 206.4 2.00 .00 245.7 206.4 2.50 .00 305.2 206.4 3.00 .00 366,9 206.4 3.50 .00 409.6 206.4 AVERAGE PERM-RATE: 68.6 MINUTES/INCH SATURATED PERM-RATE: 68.6 MINUTES/INCH GROUND STORAGE BEFORE SATURATION: .00 CU-FT/SQ-FT 2 • •• •• •• • • • • •• ••. ••• ••• ••• • • •• • • • • • •• •• • • • • • • •.• • • •• • • • • • • • . • • • • . • • • . • • • • •• • •• • ••• • •• • • • • • • •• • • • •• • • • • • • • • • • • ENTER [d:](path]filename[.ext] OF COMPUTED HYDROGRAPH: • ••• ••• •• •••• ••• C:cobb ••• ••• • • •• •• • • INFLOW/OUTFLOW ANALYSIS: • ••• ••• •• • • • • ••• • • PEAK-INFLOW(CFS) PEAK-OUTFLOW(CFS) OUTFLOW-VOL(CU-FT) .05 .00 0 INITIAL-STAGE(FT) TIME-OF-PEAK(HRS) PEAK-STAGE-ELEV(FT) .00 16.83 3.44 PEAK STORAGE: 400 CU-FT INFILTRATED VOLUME: 334 CU-FT ENTER [d] [path]filename (.ext] FOR STORAGE OF COMPUTED HYDROGRAPH: CONCLUSION: Using the slightly roof area to compute the required on-site facility(0.06 acres)the calculations show that using 4-SC-740 StormTech units with 18-inches of drain rock around the sides and ends provides sufficient volume to infiltrate the 10-year storm with a safety factor of 2.See the attached drawing for layout. Prepared by: Bruce D.Goldson, PE 1 , Theta,LLC PRO 4j PO Box 1345 712o - Lake Oswego,Oregon 97035 ( OVEGO; y fibe L2 GO 3 . ▪ •. .. .. • • •• •• • • • • • ••• • • •• • •• •• • ••• • •• •• • • •• • •• •• • •• • 17.22' • • • • • • •• • • .. • • • • •• • • • • • • • •• •• •• • •• •• ... ... • i / i. i I ••• ••• • • •• •• • •• •• • • • • • • • at g — v , ,,,• • ••• •••. •• I • i SC-740 1 j . �7 if !/ `J ivit v -1.-.4r_ i . tj ow:.-_7, Lr _ _.. _ - C TRAPPED SILT BASIN DETAIL t..3... `t 1 —I 8 I } i `,if I I --' L.1/2"X:5/1:"-O"_ . =nom,: 3§ 1 ^t OR O VALENT 5C-740 END CAP STORMTECH SC-740 IROOF DRAIN INFILTRATION i FACILITY TO BE MINIMUM 10-FEET FROM FOUNDATION AND 5-FEET I iIFROM PROPERTY LINES. TRAPPED BASIN TO BE PRIOR TO DISCHARGE STORM WATER INTO FACILITY. 2016-181 STORM DRAINAGE REPORT f 4 { . . . dg .5- .. _ Tax Lots 2000 20011 S I ENGINEERING - SURVEYING - PLANNING 156 O i! 79 h venuei - -1 ?o sox1345 O3/48t-8822 9 3 a Lake Oswego.Otego 97,,:',5 ernat thetaenc :_,.. :let _____. r .a r..tP S "a �r`r .8 t �5„, uuy $rs >P s { 'fie; 'tq.. -,- nzrn r, , mit... '1,-r-,-*-:-,,,---,-',-r,'", ''''''- :'. f' ' t3"' i ,� + ' +a? era" 7l � :!:*,,,:',\ C o.,4, trt .1,'..,:'' , ...• : (C) gills $. f"`* C � = 410111i . Null illt) '1 0 x) ri ,, 9 al CO t� rig +� kV •, .•• 3 0 sa. C c {yam ' *'^'". A it coat ••• ei C yyA- co . ,:, via i �•vSF •.• ln L 7 " ••.v' • •• •• •• •• • • • •• • • • • • • • • • •• • • • • • •• .• • . •• • . Detention-Renintiort41 echarge . . ••• • ••• ••• • • •• •• . . The StormTech SC-740 chamber optimizes storage volumes in relatively small footprints by providi:g • storage.This can decrease excavation,backfill and associated costs.The StormTech SC-310 onamb;r is tlieti rot e• '• low-rist anc,•;de-span solutions.The chamber allows the storage of large i_folumes. 1.3 fft:(0.4 m^in)) iminimurr),at minimum depths. ACCEPTE-:4' ;00 ram) SCH 40 PIPE FOR OPTIONAL INSPECTION PORT StormTech SC-740 Chamber ,not to scale) - Nominal Chamber Specifications Size IL x W x 85.4-x 51.0'x 30.0 ; , .k-2170 x 1295 x 762 mm) . Chamber Storage 45.9 i1.30 Minimum installed Storage* -- 74.9 ft- (2,12 fl) Se-740 end cap — tat-0 Tani INSTALLED ----- Weight 74.0 lbs(33.6 kg} Shipping _ . . 30 charnbersipallet 7'62 60 end caps/pallet 12 palleis4ruck C, SC-740 chamber StormTech SC-310 Chamber (not to scale) Nominal Chamber -ACCEPTS 4 003 etvr, SOH4 PP E FOR OPTIONAL Specifications ,t,4SPECTION PORT )77-& Size(L W . 85.4'x 34.0"x 16.0' r/170 x 864 x 406 mml Chamber Storage 14.7 t:t0.42 *rf' • ;- Minimum installed Storaget t= 31.0 ft.'(0.88 rn'i 12,(305 mrn.? 6 DA MAX 12300 rrnv 1E8 qtrtt:/ Weight SC-310 end cap -SS 4 .2;72 T 311 37.0 lbs 06.8 kg) Shipping 16X1 41 chambers/pallet fr.!, 106 end caps/pallet — MT, +.- 18 pallets;truck SC-310 chamber • This assumes a minimum o;6 ncries(.59 mmi of&one beo anr.we and beti.reer chamber rows • •• •• •• • • • • •• ••• ••• ••• ••• •• • ••S . •• • vt „,7:- f ' • • •• •• • • • • • • Detenti - = to tie - c e • • ••• ••• • • •• •• The StormTech SC-740 chamber optimizes storage volumes in relatively small footprints by providig 2. tt' •(6.C�•,• }, •ins umj o �' �'' (nS Cn storage.This can decrease excavation backfill and associated costs.The StormTech SC-310 chamber is/*el to?systems fecthirtrlt low-rise and :vide-spar:solution.The chamber the storage of large vb unies. 1.3 Witt't0.4 m`7m i(minimum).at minimum depths. '---- ACCEPTS 4-;i0.0 mtnj SC?-!40 RIPS FOR OPTIONAL '.i'SPPECTIO PORT. SturrriTech SC-740 Chamber - tact to scale) - Nominal Chamtfei Specifications l • Size L x rrl"x l t ` 35.4 x 51.0 30.0 (2170 x 1295 Y. 762 mmi Chamber Storage _ o C nk:------. Minimum Installed Storage' ;2 12 r` i SC-740 end cap 85.4'12t mry,iNSTALLED -- Weight 74.0 lbs i"33.6 kg) — Shipping t ' ; 30 chamberspellet 60 end capsrpallet 12 pallets:truck SC-740 chamber StormTech SC-310 Chamber (not to scale) Nominal Chamber AccE::Ts,i WO11M pec Pica ons SOH.ii;P:PE FOR OPTIONAL "SPECT;ON PORT -_ Size TT..-�'j,_,� :i. r.Ji---�4 �I.�a s t -�_ 35.4 x 34.0"x 16.0` {j (2170 x 864 x 406 mall Chamber Storage >' • Minimum Installed Storage .,- 31.0 Its(0.86 rt)'1 +fie. 12,g50.5mm — _....- .- _.._..�.... ERn.'.=ih T^ Weight SC-310 end cap Shipping rs.c 41 chambers/pallet moetri, 103 end caps?pallet " 1i pa11GtS.�irUG{ 3=a e 4'v, . SC-310 chamber `This nts assumes a minimum ort `:tones C50 mm)of sr.one be ow.above and bet{ween chat"ber rows. . . , • •• •• •• • • • • •• • • • • • • • • • • • • • • • • •• •• • • • • • • . ••• • • 5• • • • • • • • • • • • • • • • • • • • • • •• • •• 0 ••• • •• • • • • • • •• • • • •• • • • • • • • • • • • • • • • • • • • • • • ••• • 515 • ••• ••• • • •• ••• • • • • Table 5 an:i Table 5 cri.y-',:.c..--int7.: .-71.enV_II•67..0 .1C7•Ei ',••••-1,...:7;_"•3 . • 0 •ilk_• 0•• •• •• • • TABLE 6-SC-740 inr.remental StOrtge VO4UMOS Pier_.,cirter• • ••• • -- • • •• a.hci 3(2_740 cha...r.ciii7 sysi:erris. 17."••,', 7 ...:- 4ss:..rr 4;aF:2 ay t,:i.e ...,..,s.-e•-..d t.:-.)caa -,--tion'7' 4-1!-..-,-,,- upon a t3.- i'752 r.-ir--.;) ..:7•,7'..',T-c•Sa.se 1..?,-7,cie..-:'70-CharrriaerS.. stage stn,rac.)..4. .:turcia. A spr4,,Yai.lsI,,,aal. .F. :E.,..,..a,•- a.pie at;P:vm..F.to.!-T-ntecI7.ccinl In ' Cr th.-.7 ..jr! - .r. :; b!-Iambets can be input iv a cumulat,ve caIcutatiGns Product Sr.,octIfications:, . ,. 22..2.3 -..,..-i c--i.;.."1,2 45.t.-5C.-(1.39) ? .232i2 • TABLE 5-SC-31fi!ii cremental Storage VOillrileS Per Chamber , 45.1.4•!... 1.-: "..: • '..-:-.',/f.!,.2..',..'F'2.: ..3'.6•.S.'‘...r17t3'.5.-=-:':.--:. :::":•'-::-7'.:•y•.. Ca _;(3(••-;.75.1-!re Eia5a.f., :47;i yslE., ..±:,:le 45.90 Upon a2' -:;:::'.-'7.7,:C):::.,-:::- EaSe f..Tha...i.'"If7e 07.,..7.,7""1::'Lrr..'7... -E.'.:j tr,:'-z--!1'; •:::'1;:1:',4.5.c.43(.1...3(.1oi „. ...7(.5?(2.025) .. 45.90(.1.3.00) .. 7,3.39(1.993) . . 3T .'.:•-16., ! 45.90(1.3(.10! 6925.1.961) . . . . ,. .. 4F1.90 0.3f..1.,<:*;; 68 14 45 65',.1..2•58.... .. 6-5.. 1.1,397) . . 55'":! "12S4,;.; .. 55.75.0.8ED 2P.., -.'"•-•-: 4, 1410 0.415 • 37.;:l.j. t::'.:.-*... :•.'.: .:4•:,-: .. 45..41 il.2•85J t4..4,...,•,.. .-..,4,5 • ..i2..:;,,`,.•_,- 4431 0.25;.14 52..9111.743 i. 14.7P(Q.,4if() :'( .2.1 4L-!0.24-5) L56(.FZ,3t: SVIe 14,10-(0..4.15 . -u--(1.).f.,;?.?. 30'7t32) .• 43.116 0219) . • . . .59,06(.1....689) • • 2 .(410) ,,...)v.c.-t 14.70(0416) : 28.63 241,E,',0.9 1 14.7Q(0.4.16'i 27 64.c. .-77!:::;:::, 2,s .-:',.1: , • 40.30 0.1.55T1 55.4.35 14.7.0fe.416. '.:7 05(C'7F--•.::, 7 .- .23) 54.17(1.54... • 'Li .:'3'3". . 14.71•;:,:.i.4••••5- '.f.3.2,ft..-,17,--::.." :...c..;'..i.',..--3.0! .38 1 ii.fi.1..081-; • 52.2•.'.::,-I.•47g..) 2 . 1 4;34 ::115:f 25,43•!•'.. 221! 2:5j5251 _ _ .. 3i..,..74 0,N,:). .:.,,;,23f7.44 . Hc i..5'38 14.414..C.,410 - .24i.•:4... if'2.6?:,....: . 24(.5•I•0..;' . • . $ .22".0•,9-77.i) . ...46.1 (1.365) • 4.22 402) 23453(.1.1.j3-53'. 23 t584'i: ..33..64..,111,.953 46.11.(1.:;.:(16) • 22:47-(i)66) 22(55il • . 1.99,.0.9(16) . 44.00_0246) 2. .? F.) 21.25 1..0.6:02) 21 6331 3029 '1.:.-6`5,51 . 4125(1.1851 - 7' . 4:': . lci.97!0.565 20 f:Sc.,5) • 2i...1.. 4 -f1F.11.ii.... 39.57...!,1.12% .... 19. $.5.3:, . , . .. .. .... .74..... . ..7:: . .. 37,47;1..i;t:i.). 2•,:-;)•52-3-,, ••.E,:4„4.•57-,-,.. 4..8(:,('17!..1.5,--... •=,..C.i..•.-2,:e4-1) 14.L,',.:4,-;;: 1C;•-•.23;.?"..,..:::ii:.' FT 22..!,0•.4&3;.. 77:,•432.• . 23.. .t.0.65.1..) . . ...`:=2..9.S.A.Q.939 . .•-45•••C.26 -'.:.T.E..0.44-7- • 6 f.- -2.6:, 21.C6•f..1.1.69.6". . .30.1-iii.1,14-369) . i 1.1 ..:;•::-...: -1...99. 7). .IS i.:1•81-. . 19 C9 .f.).541) . 11 i.,27,,i•:: . 6.7.8 0.1.9 ) • 12.77 t0..3.K) 14;:3:731-1,08(04) 25O03.7 1 g i..154.. 5.51 t115.5) 11 22 (-...'34.1) . . 1 (9.426) 2166..(0,67U) '.-.:.-.-: • 4A(0.11ci) El(-34 ..f. 27t.:•!) 12.(.3.)5 12...973r,7, 21.-31.(...1.6e?). F4;4'! ;3)2'3 1-:..5..227: , ..."'1..i,27.::•?. I[.;.-ST.Y).;.0.91:' 1 f..'..C2.(0.535).. 7_.., .42...0.fi,41-j• F,..40 ir..f.1.)31- l'2,. 2:7-:4.'? C3.740..247) ';'..;_:5c • .:..-,,.7: :.':- 4 4: 1.:41.' • -- 7 ,. -.1.i.,5 2 4.41 i'"''':;:,•: . Stc,:re ri 3.i 6 ifj...ag3) 1 f,17F3 . . . . 2.21. t,0,063:.i. . ."..,.21 y.-:..26.4•:-. • 1.-s-A '-.3 . i.3 i.;.i i.-..i Nil) . .3..-Ii..i. •Fs-;:.J7i•la!i•-.)1 - .- 2.37 f(1.C6T) • ••.. •-•' A ..-.' , I._ 0 5i •cF.-1 • 1 6 1. .1-.. - f)..r.a6.) - • 1 . 4•:.1.0.z.) St-o•ri3 ,2 4..57 7 273, • V 7S .02.2! . . :,t7.6). .FD-Jricia. , . •.1 3.3F.-.10.0g5) i:4.;'•.-.'1.79::::. .'•!....a:)22'7'...'Jt510..--aga for eac.t,'oLigiti.ops O . 2 2.S. G i35,4 it!cf7 ;2:5:171:7:i Of st'o:t...t.f:',":':-/j::',.":1_ 1(',25) • • 0 ,...".3,,..1."..:".1=2 . iVore-.4rli.`!.73 co.ft. ki.t.732 fl?';of slowe fcr Facn addiikzaa) inch i25 am)of stone faalarion. 14 Call Sc zi 860.529.8186;;r 688.892.2694:.:•-f-.'is:!.:::,...••••,.,,,,a,•:.-6'4,74...,:..,.vrtp.o.stgrrntech.com t:-...,,,-,:i.,:t.,-,te..'a=-;..t r.•:...".,:ljci • •• •• •• • • • • •• • • • • • • • • • • • • • • • • •• IOW • • • I • • ••• • • •• • • • • • • • • • • • • • • • • • • • • • •• • •• • ••• • •• • • • • • • •• • • • •• • • • • • • I • • • • •• • • • • • • • PRELIMINARY E pMINARyDRA[NAGE REPORT ORT ••• • ••• • theta jr� �/^�} 79thAve •••• •••• • • • •• •• 15630 SW A • • ••• ••• •• • • • • • TIGARD, OREGON MAY 2016 Narrative: The subject property is on the west side of SW 79th Avenue in Tigard, Oregon. The site slopes away from the street at approximately 5%to the east. There is one existing older house in the northwesterly corner. The USDA web site finds the soils as 21B, Hillsboro loam with a Type B soil. A test pit approximately 40-inches deep was dug and pre-soaked the day before the infiltration test. The soil was moist by no seeps of water noted and after the presoak the pit was dry.The soil was brown silty clay loam. Existing roof drains are connected to an undefined underground system and there is an operating on-site septic system. Reference: Lake Oswego Stormwater Management Manual,Appendix B infiltration testing guidance. City of Portland Storm water Manual Infiltration Test Three one hour successive tests were conducted with the results of the final, third test reported below. The test was conducted January 28, 2016. Time depth Time Depth 2:30 17.25" 3:10 18.5" • 2:40 17.625" 3:20 18.75" 2:50 _ 18" 1.75injhr indicated rate, recommended design rate 0.875 in/hr _ _.,.. •••• --—..,...„_—. -- — ----,---- „,-1 ...-- ..... • • • •• , ,...• ' ..”. . • • • •••• e • •••• r,. 7..1 • • i • • '0 • , 9) • i. • * • •• ... 0 .1 .'.'', E 40; • • to - .1 '71 (.), ', . " • SSS - • • t-,-, to o •• •• , to to • • •• • • • • • •• ' . . . . :..... el R. ‘. • •• • • • ......''''''-) 1 CI • •••• ....' C. • 11 • 10:*-..„-Kt-t)e.IN „..., 4:: • • i,•1-I . ., • •• 01 l'.9e t.• , ,t, A • •• • • • t • 01 1111 .. •-; Tei • • •••t :.-• 00 Cif/I 00 n(11 . ...„,,...... •••li-,$4.,), :1 ••• it S • d'il4t * i-,, ?, .."' • • •••4IC Cll e...-''''' , W 41 ,,, c..) r :1 g -:,.-., tu ,1 c c. ,,, h.• III ...1) ... N "`.' ty, ty) co nc:17)• t°r.•,'""t•ti rt.)ta C., 73,19. .t. ........, .. ct,,,,,.. 0.E. ;4 E r. 4;., -• C.) -t ilt *-1- z 4:1 k_. 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