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9ro � . <br /> w s _ <br /> 1-"lla <br /> 100- - <br /> ❑ ® GROUNDWATER <br /> ❑ TECHNOLOGY, INC. 4057 Port ChicapHoway,Cancud.CA945.0(415)671-':.387 <br /> FAX:0151685.9148 <br /> i <br /> September 11,1991 <br /> Project No.02D3DO163.030504 <br /> s.-.. Mr. Cunt Rogers <br /> Chevron U.S.A Inc. <br /> P.0.Bax 5Do4 <br /> San Ramon,CA 946M <br /> Subject: Groundwater Monkcring Report <br /> Chevron Facility No.9.0342 <br /> 1347 South 8 Dorado <br /> Stockton,California <br /> - - i <br /> I Dear Mr. Rogers: <br /> This letter report has been prepared for Chevron U.S.A,Inc. (Chevron;and summarizes the results of <br /> J routlno groundwater monftering and sampling performed by Groundwater Technology, Inc.at the above- <br /> referenced afte. 111 <br /> t <br /> IThe four monitoring wells at this Chevron faclity were monhored on July 25,1991,to determine depth <br /> to-groundwater(DTYY).hydraulic gradlent,and to check for the presence of separate-phase <br /> hydrocarbons. Figure 1 shams well locations and groundwater potentlometriasurface lines. The <br /> calculated gradient Is.001 ft/ft,and slopes to the northeast. <br /> After measuring the DTW,the four monitoring wells were purged and sampled on July 25,1991. All of <br /> ` the groundwater samples were analyzed for the presence of benzene,toluene, ethylbenzene and xylenes <br /> (STEX)and total petroleum hydrocarbons(TPH)-as-gasdlne. Also,th4 water samples collected from <br /> monitoring wells MW-3 and MW4 were analyzed for the presenca of fecal coilform. Table 1 presents a <br /> summary of the current and historical groundwater monftodng data and analytical results. Copies of the <br /> analytical reports are attached. <br /> 'f <br /> OfAcei lhmughoul the U.S.,Canada and Ovmevs <br />