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GETTLER - RYAN INC. <br /> . April 14, 1999 <br /> G-R Job #180137 <br /> Mr Edward C Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, California 95661 <br /> RE First Quarter 1999 Groundwater Monitonng& Sampling 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 1, 1999, 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-713, 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 1 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 /> 1 DG <br /> o <br /> Deann"La d1 Q J.Cq,9r 1 <br /> Project Coordinator Ce/ '�kF9 <br /> �✓ / � '� No W7Stephen J Carte <br /> Senior Geologist, R G No 5577 <br /> OF CAL�F� <br /> Figure 1 Potentiometnc Map <br /> Figure 2 Concentration Map <br /> • Table 1 Groundwater Monitoring Data and Analytical Results <br /> Table 2 Groundwater Analytical Results - Oxygenate Compounds <br /> Attachments Standard Operating Procedure - Groundwater Sampling <br /> Field Data Sheets <br /> 5896q Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J - Dublin , California 94568 (925 ) 551 - 7555 <br />