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• <br /> GETTLER - RYAN <br /> INC. <br /> � April 24, 1998 <br /> Mr Edward C Ralston G-R Job #180137 <br /> Tosco Marketing Company <br /> 2000 Crow Canyon Place, Suite 200 <br /> San Ramon, California 94583 <br /> RE First Quarter 1998 Groundwater Monitoring & SampIing Report <br /> Tosco (Unocal) Service Station #5886 <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, MW-4S, MW-5D,MW-5S, MW-6D, MW-6S, MW-7D, 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 level data and <br /> groundwater elevations are summarized in Table I A Potentiometric Map is included as Figure I <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 I 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 /> ennaaL Harding f 4yC?� �.F�1 J. <br /> Project Manager J o <br /> � No.5577 <br /> tephen J Ca er <br /> Senior Geologist, R G No 5577 �,9TFOF CAL�Fp�� <br /> Figure 1 Potentiometric Map <br /> Figure 2 Concentration Map <br /> Table 1 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 ( 925 ) 551 - 7555 <br />