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<br /> ?1 ,'',.. % ;r Work plan No 25.948223 1 b t .;
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<br /> ,� At the request df City of:Rlpon;.Gettler=Ryan,Inc (GR)has.piepared this Limited:Subsurface,Assessment h1. 7
<br /> K.. Work:Plan,in;response to a Sari Joaquin'County,Environmental.°Health Departmenf(SJCEHD) letter,dated _ " u
<br />',° . .t_ January,.8, 2010. The purpose.o"f:tills work'.plan is�:t' assess.theAvertical.arid lateral extent of petroleum Z_k e
<br /> ` ' " .. ` hydrocarbon contaminated soil l eneath'the western end of the foi=lner u6rid rground•storage:tank(%:UST)at the ''' }f '� ',
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<br /> sd . subject site:.'The proposed scopelof work includes updating-the..sit'e healtli,and safety pian,`excavatirig=four A. < ; ,. � 'k'
<br /> test pits;withtn't. former UST exc1.avati1.on, collect soil samples from thej:test pits, and preparing a.repart ,r �'� '
<br />"� presenting-the findin_findings-of of the investigation, Na ` ?} ;:--. ' 6 'Ma , ; �d r,
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<br /> t " ,The scope of work described in'this w1.ork plan is`irltended to comply with the California Code of Regulations �; j
<br /> Title'23,.D.ivlsion 3, Chapter F 6;.Underground Tank IZegulatrons, the.CRW,QCB`.Trr-Regror�aLBoard Staff' {' '',�
<br /> ` .,Recommendations for-Prellmrliary lnvestigatio, and Evaluation of Clnderground Tank Sites, and SJCEHD J ; ;,-11 l
<br /> �€ 4' guidelines and regulations.* .'sr t 3i s << ti •( . h x' vy`- r , . i. a
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<br /> SITE DESCRIPTION � dg. ry �' ° . k: , Q
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<br /> s�' The subject site is located at 239South:Stockton Street,Ripon,California jTopography in,the vicinity of the , 'p,•.1
<br /> subject site is'relatively flat at%an elevation ofapprox>mately:65 feet above:inean sea,level'�T e subject site►s `." r i .f
<br /> kY former gasoline servlce,.statioil :Pertinent site features consisted of.one former 1.2,000 UST and o_ne former`. i-� ",
<br /> ., disI. }ienser island. P_ertinent.site-feature's are shown on:Ftgure:l f °� a f � i `,''
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<br /> PREVIOUS ENVIRONMENTAL WORK _ r' -� r _ :A . .
<br /> On November,,l2,_2009, GR ob"served ahe removal of one 12,OOO�gallon UST{by Speelman Excavation , Y " 1.
<br /> f - .(Speelrrian)at-the above referenced-site. Following_UST removal;GR.collected'soil samples TW'13 and TE - :{�^ , ,,: ,
<br /> "� .'.f3 at a depth of approximately 13 feet below ground surface'(bgs) from the beneath each=end of thea former ,
<br /> F UST. GR also collected.soil sarnple'.TM-1340 m beneath the:tank mid poinvat adepth of l3 feet bgs. Water R
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<br /> was not encountered in the UST excavation ti x'' t°
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<br /> x- "'Benzene;toluene ethylbenzene,.and_tota1.l xylenes (BTEX);methyl-tent-butyl ether(1VItBE),ethyl t,.i-t-butyl, `, „}ti
<br /> ti; z '' ether." ETBE ` di-iso ro 1 ethei : D1PE ;tert am 1'miieth 1T.ether TAME 1Ktert-butanol't TBA -"1 2 K
<br /> -'dichloroethane (1,2=DCA)-and.ethylene dibromide:(EDB);were'-reported,ras below thealaboratory "method N �I
<br /> • reporting limits in.samnples TW-13,TM- and TE 13 Total Petroleum Hydrocarbons as gasoline(TPHg)'was .y }$x
<br />`s'� y : , . detecied'in soil,samples TW l3 at a concentration of__. .parts'per m111ion(ppm)and;w11as reported as belowthe �P'� -.
<br /> laboratory method reporting li11_mits m samples TM 13 and TE=13 1 � ? s e= r s i.$tI :y ` _ r
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