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Plans (48) JUL 2 7 2016 Nick Vial 61i .p j' ' 503-740-7340 ,` :..' s } ;"° ^ } nic@grow-construction.com 6 July 2016 Re: Infiltration testing for 10050 SW Tigard Street, Tigard,OR Dear Mr. Vial, Field Investigation: Rapid Soil Solutions(RSS)has performed a total of one(1)infiltration test per lot.Figure 1 shows the project site. The infiltration testing sheet details the soils found and the location of the test pits. Soils found on site match those in below soils map by DOGMI 0-90-02 Beaverton Map.RSS found the fine grained flood deposits. See details of soil on the infiltration sheet. Infiltration Testing: Infiltration testing was performed as per the City of Portland Storm Water Manual. Tests took place in the sleeve hand augur hole at the depth of the bottom of the proposal soakage trench. The test was run a total of three times. The rates are shown on the following page spread sheet. The rate is 5in/hr. Depth to Ground Water RSS excavated another hand augur hole to 9ft and did not find ground water. According to USGS ground water is over 50ft below the site. The analysis, conclusions and recommendations contained in this report are based on site conditions as they existed at the time of explorations. Any questions regarding this report please contact me at the below number or email. Sincerely, # ` %` ` CITY OF TIGARD I P F:VIEWED FOR CODE COMPLIANCE v ,mrovcd: )\./ I \5::::,:\.\\ 3 mit #: parg-T c'y g .n,..__ , `` ; H E D "kh ss: 1 f1 0.A---r) �bJ —1—,,i c .3): J I Date: R_ i _ 1 . " Mia Mahedy-Sexton,PE GE. Rapid I SO1. =- 3915 SW Plum Street,PDX mia ra @ pidsoilsolutions.com P r Infiltration Test Results Project: 10050 SW Tigard Street Location: Tigard,Oregon Date: 6-Jul-16 By: Rachel Gipe,G.I.T.as supervised by Mia Mahedy-Sexton,PE GE HA#1 Totalde,thof4' #1 #2 Time Time ®_111.11111111111.111 12:10 12 1:10 E 2:10 Measurement in 12:30 9.25 1:30 12 2:10 9"5 2:30 912 .5.5 12:50 6.5 1:50II. 1:10 5.75 2:10 2:10 ©_ 6.75 3:10 7 Rate in/hr : 6.25 IIII- 5.25 `, RSS observed the soils on site through one hand aunger .ti {� ,`^ , boring(HA#1).RSS found that some grading has occurred _ ,_1 ) t on site,as is indicated by dark brown,organic rich soils to a - ' depth of 9".These soils typically form when organic „„<"-- ` � `„. material such as grasses or perticularly orgnaic rich soils are , ` `t ;k� -r burned during grading activities.Below 9",RSS observed a typical sequence where medium brown,fine graiend soils (the old upper horizon)gradually lightens(looses organics) , . over 6",transition to native subgrade at a depth of 1'3". .w 'k > Between a depth of 1'3"and 3'the spoils were damp, medium-tan brown # ` fine graind(Silt). ' ,`' p From a depth of 3'to 4'RSS encountered sandy silt. ifitAll ,:f 4 e = 40 5°ft I S_W Katherflie St 1 Rapid I q rl S L R ...„,oik... o w LLc 1 503-816-3689 mia@rapidsoilsolutions.corn . 1 ,,,` SW Locust St ' A ' Y a9rC vn',t- sW ir %l, _,,,,,,,, _rii,_1„,7,1 a Eongle�rood `p $ Park a E ro ta`s ti u: o a 44, ,. - �� Sky High Sports. 4 St`.lantes 4n 3t teff ApaltmenTB SW North Dakota St SW North Dakota St , it 0u_cot Dr St calf . GO cd St a a �y n 9 . ty SW pi/�sSt Kjj . 3 Dlrksen «L::4 r - n '''E'f Nature Park 1i��SW Tigard St - r �f4" 7 r kve '5'' " St 3fy SCF SW Lyne St � *s� Woodard `iter '/Ann St City Park' �Sf sly.4 Tigard IC WEST 4 SW Tool Si " °4*. „Sz ° x ,(t..'4" ,batt is i, Cola r4 m SYtIrrn f �# t ,tr. �r3 541 4'1 to St , SW Former St 3�y. es St > SW petty to Ct ,$) ,1,,, ,t4,1., m6 on St - SW Park St e. ' eokP3 to vs ,°'' ot.R1 -4,..„...., Creek hark tri �� Tigard Public L SW Fauna ren St y SW prnara St rt, a H Mart SW E89etvaOd St a a? ry, 4:2 _ 9 SWHii-evrSt :C ,a.. i Walgreens a a Goodwif T ft Store ,3t r Caarde St sw Gaatde St sw McConaitt St SW McDonald St SW Cale tri a a yr SWMtCJ[ina a :T' a a n. - A a S' a Ilarhetr.crr+intht Tnnla m Figure 1—site location