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n <br /> U'A 1. <br /> GROUNDIVATER <br /> LJ 'i TECHN0L0GY, SNC. ,lait'r,nChi:astuHr;hxay.lrn:urd.C.lyd�'llr�l�fri�t=:'ti— <br /> FAX:1401 3-91411 <br /> February 18, 1992 Project No.020300165.030504 <br /> Mr.Clint Rogers <br /> Chevron U.SA Inc. <br /> P.0.Sox 5004 <br /> iy San Ramon,CA 94583-0804 <br /> SUBJECT: GROUNDWATER MONITORING AND SAMPLING ACTIVITIES <br /> CHEVRON SERVICE STATION NO.M342 <br /> 1347 SOUTH ELDORADO, STOCKTON,CALIFORNIA <br /> Dear Mr. Rogers: <br /> Groundwater Technology, Inc. presents the attached quarterly groundwater monitoring and sampling <br /> data collected on January 14, 1992. The four groundwater monitoring wells at this site were gauged to <br /> determine depth to groundwater(DTW)and to check for the presence of separate-phase hydrocarbons. <br /> A potentiometric surface map (Figure 1) and a summary of groundwater monitoring data (fable 1)are <br /> presented in in Attachments A and B. respectively. Alter measuring the DTW,each monitoring well was <br /> purged and sampled. The groundwater samples were analyzed for benzene,toluene, ethylbenzene,and <br /> xylenes(BTEC, and total"petroleum hydrocarbons(i'PH)-as-gasollne. Results of the chemisal analyses <br /> are summarized In Table 1. Laboratory reports and chain-of-custody records are included in Attachment <br /> C.. Monitoring well purge water was stored on site in a labeled 55-gallon drum. The purge water has <br /> ' been.cheduled to be removed by a Chevron-approved contractor for transport and recycling. <br /> Groundwater Technology is pleased to assist Chevron on this project. If you have any questions or <br /> comments, please call our Concord office. <br /> Sincerely, <br /> GROUNDWATER TECHNOLOGY,INC. <br /> Sandra L.Lindsey awd R.laeesattel <br /> — ---- -- ---- Project Manager -.-- ------ ----- ----- - -...Registered Geologist---- BRED-G$, ---- - -- --No.6136 `.�� 10 <br /> Attachments: Attachment A -Figure 1 <br /> Attachment B -Table:1 QAW R.KLEF8A in <br /> Attachment C -Laboratory Reports N0.5130 <br /> LMISSAZFH ��+ IT <br /> CAS-;�0� _ <br /> - r pfrru'rhnnrgh,ar!!hr!:ti..C'artdd�and(h•,•r�,wS - <br />