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Advanced <br /> GeoEnvironmental, Inc. -o:- <br /> o f Northern California <br /> 09 July 1997 <br /> AGE-NC Project No. 95-01 3> - <br /> Mr. Ron Rowe <br /> San Joaquin County PIIS-EHD ALIO <br /> P. O. Box 388 <br /> Stockton, CA 95201 <br /> _ _ ��tuu+ttt►w�� <br /> Subject: Results of Site Investigation <br /> DEN'S ALj,rO REPAIR <br /> 308 South El Dorado St.rect, ;Stoelcton, Califcrmil <br /> Dear Mr. Rowe: <br /> In accordance with a rectuest from .1vIr. Den .'Ueda of Den's Auto Repair, 4&,,anced <br /> GeoEnviro;unental. Inc. "AGE) proposes the installation of three ground water monitorin;-3 wells <br /> ved work plan for the site at 308_South El Dorado Street in Stock-ion,Stock-ion,under procedures in the appro <br /> California. <br /> The results of the linnited"subsurface investigation of 23 June 1997, indicated that hydrocarbon <br /> impacted ground water Was present at the site. Ground Nvater beneath the former UST location ,vas <br /> impacted with total petroleum h.ydrocar ons q;.antif;ed as gasoline, benzene, toluene, ethylbenzene <br /> and xylene(BTL='&X). Additie;.ally the l..Vater sninples'contained methyl tertiary butyl ether(MTBt ). <br /> The investigation also indicted that impacted soil was .thnited to'a.-depth of 35 feet and the lateral <br /> area surrounding the former l?ST tank excavation: <br /> Three wells will be installed z.t the site to determine the lateral extent of the gasoline; BTE&X and <br /> MTBE plume in the up pradient and do,,vn �radicnt directions. The attached site plan indicates the <br /> proposed locations of the three wells. Also attached:.is the draft results of the preliminary 'site <br /> investigation. <br /> The borings will be advanced to a depth of appro'i.mately 45 feet. The well design will utilizing '?, <br /> feet of perforated screen and 20 feet.of blank two-inch blank casing,'to alI:ow for an adequate,water <br /> interface over the course of the site investigation. Each new monitoring well will .be developed <br /> utilizing a submersible p UMP until water is essentially sediment free. Quarter sampling will then be <br /> scheduled with your office. Initial findin,,s from the Julie subsurface investigation and the well <br /> installation results will-.be presented in a Preliminary Investigation and-Evaluation Report (PIER). - <br /> 1 1803 West.March Lane,Suite A,Stockton,California 95207 <br /> 'Telephone.(209)956-0264 FAX(209)956-0700 <br />