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y <br /> r _ <br /> u <br /> GROUNDWATER <br /> EIEIEI� TECHNOLOGY, INC. 4057 Port ChkagoHighway,0mconl.CASi4520i415,67i_387 <br /> FAX:05ii;A,91 A <br /> May 13, 1891 <br /> Job NO.2D3 175 3288.02 <br /> mr.allnt Rodgm L CEIVED <br /> Chevron USA Inc. d U L 3 f991 <br /> 2410 Camino Ramon <br /> Bishop Ranch#6 ENVIRONMENTAL HEALTH <br /> San Ramon,CA 94583 PERMIT/SERVICES <br /> Subject Groundwater MonttorUV Report <br /> Chevron Facllity.No.9-0342 <br /> 13447 South EI Dorado <br /> Stockton,California <br /> # <br /> Dear Mr.Rodgers: <br /> f1 This monitoring and sampling letter report summarizes the results of routine groundwater monitoring <br /> (RM)conducted by Groendwater Technology, Inc.at the above-referenced site. <br /> The three monitoring we lis at this facility were monitored on Apol 5, 1981,to determKl depth-to- <br /> groundwater <br /> epth-to-grog er PTW),hydraulic gradient,and to check for the presence of separate-phase hydrocarbons. <br /> Table Z presents the cement and historical groundwater-monitoring data. Figure 1 shows well locations <br /> and groundwater potentiometric surface Imes(attocheci). The calculated gradient Is 0,002 ft/ft,and <br /> slopes to the northeast. <br /> After measuring the DTW,the four monkorir','wells were purged and sampled, The analytical results are <br /> summarized In Table 1,whM also oontatris past analytical results. Copies of the analytical reports ata <br /> attached. Concentrations of Giir ptroleum hydrocarbons-as-gesollne were detected in three of the four <br /> monttar V wells. <br /> The pur-we water from Q wells was contahW In 65-gWlon setae:dr lms,labeled,and oWW on aIW. A <br /> Chevron reprecentaM was notifled,so that the oollectlon of the purge water could be coordinated. <br /> Collection of this water Is a*"kd for May, <br /> l <br /> l - - I���111'J/�(/NlUn171111I1.'r..�. 1'c�naJamid(1rYrs.va - '.' <br /> i <br />