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WPM <br /> P_,! <br /> ,t4 .. x <br />'r• <br />—+7 <br /> ds <br /> r <br /> GROUNDWATER <br /> ❑�iTECHNOLOGY, INC. 4057Yurt Chicago Highway,Concord,CA94a?00151fi7''_)38 r , <br /> FAN:I41516Si;9148 <br /> December 19, 1991 Project No.020301653 - <br /> Mr. Clint Rogers <br /> Chevron U.S.A. Inc. <br /> 2410 Camino Ramon <br /> San Ramon, CA 94583-0804 <br /> SUBJECT: QUARTERLY MONITORING AND SAMPLING ACTIVITIES <br /> CHEVRON SERVICE STA11ON NO.9-0557 <br /> 138 SOUTH CENTER, STOCKTON.,SALIFORNIA <br /> Dear Mr.Rogers: <br /> Groundwater Technology, Inc. presents the attached quarterly groundwater monitoring and sampling <br /> data collected on December 6, 1991. The four groundwater monitoring wells at this site were <br /> gauged to determine depth to groundwater(DTW)and to check for the presence of separate-phase <br /> i.ydrocarbons. A potentlometrlc surface map(Figure 1)and a summary of groundwater monitoring <br /> data(Table 1)are presented In Attachments A and 8, respectively. Atter measuring the DTW,each <br /> monhor`,ng well was purged and sampled. The groundwater samples were analyzed for benreno, <br /> 1 toluene, athyibenzene, and xylenes(STEX),and total petroleum hydrocarbons(TPH)-as-gasciine. <br /> Results of the chemical analyses are summarized In Table 1. Laboratory reports and chain-ot.. <br /> custody records are Included In Attachn-int C. Monitoring well purge water was stored on site in a <br /> labeled 55-gallon drum. The purge water has been sched," i to be removed by a Chevron- <br /> approved contractor for transport and recyGing. <br /> Groundwater Technology, Inc. is pleased to assist Chevron on this project. If you have any <br /> questions or comments please call our Concord office at(510)571-2387. <br /> Sincerely, <br /> GROUNDWATER TECHNOLOGY, INC. <br /> Sandra L. Lindsey David laeesattel <br /> Project Manager Registeisd Geologist <br /> No.5135 <br /> P <br /> Attachments: Attachment A . Ftgt:ra 1 <br /> Attachment S - Table 1 . DAVID R KLESSAT <br /> Attachment C - Laboratory Reports Na 511. <br /> - <br /> 011453A2.FH <br /> 2031022) FQ <br /> - - - <br /> F Cpt14� <br /> Offt(e"1hn)uuhnur rh.•1'.ti..Canada mid Or r-vax <br />