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F <br /> FEB 2 4 '92 T-011. <br /> H. <br /> GROUNDWATER <br /> L L 11 TECHNOLOGY INC. 4057 Port ChicagoHkgh%av Concord C-1945201415Ih(1-2357 <br /> F 1\ 1415)x135-9148 <br /> February 18, 1992 Project No 020300165 030504 <br /> Mr Clint Rogers <br /> Chevron U S A- Inc <br /> P O Box 5004 <br /> San Ramon, CA 94583-0804 <br /> ✓SUBJECT GROUNDWATER MONITORING AND SAMPLING ACTIVITIES <br /> CHEVRON SERVICE STATION NO 9-0342 <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 (DTVII) and to check for the presence of separate-phase hydrocarbons <br /> J A potentiometric surface map (Figure 1) and a summary of groundwater monitoring data (Table 1) are <br /> presented in Attachments A and B, respectively After measuring the DTW, each monitoring well was <br /> purged and sampled The groundwater samples were analyzed for benzene, toluene, ethylbenzene, and <br /> xylenes (BTEX), and total petroleum hydrocarbons (TPH)-as-gasoline Results of the chemical 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 scheduled 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 /> 2avj�Sandra L Lindsey R Kleesattel <br /> Project Manager Registered Geologist RED GAO <br /> No 5136 .10 <p N <br /> Attachments Attachment A - Figure 1 -� <br /> Attachment B -Table 1 NO X13°136 <br /> DAVID R 5TTE! <br /> Attachment C - Laboratory Reports .f <br /> LR0165A2 FH <br /> FOF CA1A <br /> r�riu�,tlrrr,rryhuuf!h�I S („clrtULl(1 cirr(I Ut lT5c1V <br />