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2 1 yM 1 <br /> ode <br /> } A 'ts+.}ue-T".ry__'+,y„"r.0 r< � -'7 ,i¢��'Y�„�Mrr x c �� rr"'.+ w al } ..d .�3 I J'i y h 11•� $ z� <br />� ryti <br /> C <br /> k <br /> f,y <br /> AY' rvE <br /> GROUNDWATER <br /> ' TECHNOLOGYINC. <br />"4 _ f i 4fl3;Pori Chicago HfChKdc.Cuncnrd.CA <br /> November 19, 1991 <br /> Project No.020300163 <br /> Mr.Clint Rogers '` <br /> Chevron U.S.A.Inc. ��� 5 f'gI <br /> ? F.D.Box 5004 <br /> San Ramon,CA 94583 ENVIRONMENTAL HEALTH <br /> P ER'f"iIT/ <br /> Subject: Underground Storage Tank <br /> Former Chevron Facility No. 9-0342 <br /> 1347 South EI Dorado, Stockton, Califomia <br /> f Dear Mr.Rogers: <br /> I <br /> On September 16.1991,Groundwater Technology, Inc.discovered the fill port of an underground <br /> storage tank at the farmer Chevron facility located at 1347 South✓=i Dorado,Stockton,California(Figure <br /> j 1,attached). The tank was monitored using an ORS Environmental Equipment Interface Probe. <br /> Approximately 1.3 feet of water and separate-phase hydrocarbons floating on top of sediments were <br /> detected in the tank. The depth from surface grade to the top of the sediments was measured to be <br /> t approximately 3.6 feet. Based on the approximate depth to the bottom, the tank appears to be 550- <br /> gallons in volume. <br /> At the request of Chevron,seven samples of the waterlseparate-phase hydrocarbons were collected <br /> from the tar*k by Groundwater Technology on October 29, 1991. The samples were submitted to a <br /> California-cerbTied laboratory to be analyzed for benzene,toluene,ethylbenzene,total xylenes(BTEX), <br /> total petroleum, hydrocarbons(MM-as-gasolineand TPH-as-dieselby U.S.EPA Methods 8020 and <br /> 8015,o':.and greasy by EPA Method 5520,purgeable organics by EPA Method 8240,extractable <br /> organics by EPA Method 8270,cadmium,chromium, lead,zinc,and nickel by EPA SW-846 Method <br /> +. 6010,ignitability by SY1-7.1.2,pH by EPA Method 9045,reactive cyanide by SW-7.3.3.2,and react;ve <br /> sulfide by SW-7.3.4-L. Tha laboratory reports are attached. <br /> t If you have any questions or require additional information, please do not hesitate to contact Greg <br /> j Mischel or me at(510)671-2387. <br /> Sincerely, <br /> GROUHVVATER TECHNOLOGY, INC. <br /> GrWoA.Mischel <br /> Project Geologist <br /> IL 1-er <br /> Sandra L.Lindsey <br /> Project Manager <br /> GM:S°_L;gm <br /> Attachments:Figure 1,Laboratory Reports <br /> { <br /> rn+iia 7hr,aruG+rtrl tri,-/ :.idn=+.lr+n:.lrrr.r•.'+r. - <br /> I� <br />