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jig <br /> GETTLER - RYAN N <br /> Mr Edward C Ralston Apnl 24, 1998 <br /> Tosco Marketing Company G-R Job #180137 <br /> 2000 Crow Canyon PIace, Suite 200 <br /> San Ramon, California 94583 <br /> RE First Quarter 1998 Groundwater Monitoring & SampIing Report <br /> Tosco (Unocal) Service Station 95886 <br /> 2701 West March Lane <br /> Stockton, California <br /> Dear Mr Ralston <br /> This report documents the quarterly groundwater monitoring and sampling event performed by Gettler- <br /> Ryan, Inc (G-R) On March 25, 1998, field personnel monitored and sampled eleven wells (MW-1, MW-2, <br /> MW-3, MW-4D, MW4S, MV V-5D, MW-5S, MW-61), MW-6S, MW-71), and MW-7S) at the referenced <br /> site <br /> Static groundwater levels were measured and all wells were checked for the presence of separate-phase <br /> hydrocarbons Separate-phase hydrocarbons were not present in the wells Static water Ievel data and <br /> groundwater elevations are summarized in Table I A Potentiometric Map is included as Figure 1 <br /> Groundwater samples were collected from the monitoring wells as specified by Standard Operating <br /> Procedure -Groundwater Sampling(attached) The field data sheets are also attached The samples were <br /> analyzed by Sequoia Analytical Analytical results are summarized in Tables 1 and 2, and a Concentration <br /> Map is included as Figure 2 The chain of custody document and laboratory analytical reports are also <br /> attached <br /> Sincerely, <br /> �J S,��RED GFp`O <br /> eanna L Harding GC�f ����, N J.C�,9�,4�,� <br /> Project Manager f y �p <br /> e ';A- * No.5577 <br /> tephen J Ca er tP XV <br /> Senior Geologist, R G No 5577 9TFOF CA�,FOQ� <br /> Figure I Potentiometric Map <br /> Figure 2 Concentration Map <br /> Table I Groundwater Monitoring Data and Analytical Results <br /> Table 2 Groundwater Analytical Results <br /> Attachments Standard Operating Procedure - Groundwater Sampling <br /> Field Data Sheets <br /> Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J Dublin , California 94568 • <br /> ( 925 ) 55 1 - 7555 <br />