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2 <br /> Y <br /> EIDWIGROUNDWATER <br /> DDOTECHNOLOGY, INC. 4057 Part Chicago High-3y,Concord.CA1045:u141.116 1-2:N7 <br /> — FAX:14151tktit�Qsy <br /> May 13, 1991 <br /> Job No.203 175 3259.02 <br /> Mr.Clint Rodgers RECEIVED <br /> Chevron USA Inc. J U L 3 1991 <br /> Camino Ramon <br /> Bishop Ranch#6 ENVIRONMENTAL HEALTH <br /> Bishop <br /> San Ramon,CA 94553 PERMIT/SERVICES <br /> Subject: Groundwater Monitoring Report <br /> Chevron Facility No.50342 <br /> 13447 South El Dorado <br /> Stockton,California <br /> Dear Mr.Rodgers: <br /> _ This monitoring and sampling letter report sumny-c izes the results of routine groundwater monitoring <br /> p� (RM)conducted by Groundwater Technology, inc.at the above referenced site. <br /> The three monitoring wells at this faclltty were monitored on April 5, 1991,to determine depth-to- <br /> 7 groundwater(DTM,hydraulic gradient,and to check for the presence of separate fftse hydrocarbons. <br /> Table 1 presents the current and historical grour.)water-monitoring data. Figure 1 shows well locations <br /> and groundwater potentlometric surface lines(attached). The calculated gradient Is 0.002 ft/ft,and <br /> slopes to the northeast. <br /> After measuring the DTW,the four monitoring walls were purged and sampled. Tho analytJcal results are <br /> summarized In Table 1,which also contains past analy'kW results. Copies of the analytical reports are <br /> attached. Concentrations of total petroleum hydrocarbons-asi�asollne were detected In three of the four <br /> monitoring wells. <br /> The purge water from all wells wa' aalned In 55-gallon alae!drams,labeled,and stored on site. A <br /> aievron representative was notified,so that the collection of the purge water could be coordinated. <br /> Collection of this water is scheduled for May. <br /> O(ficolhrugvhowtd V.ti,•Canada arilth.r3eds <br />