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6ETTLER - RYAN INC. <br /> June 11, 1999 <br /> G-R Job #180138 <br /> Mr Edward C Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hili Road, Suite 120 <br /> Roseville, California 95661 <br /> RE Second Quarter 1999 Groundwater Monitoring & Sampling Report <br /> Tosco (Unocal) Service Station #6981 <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> Dear Mr Ralston <br /> This report documents the quarterly groundwater monitoring and sampling event performed by Gettler-Ryan <br /> Inc (G-R) On April 19 and 20, 1999, field personnel monitored and sampled fourteen wells (MW-1, MW- <br /> 2, MW-4 through MW-9, MW-11, and VW-1, VW-2, VW-3, VW-4, and PTW-1) at the above 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 G-R. 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, 2 and 3 A Concentration <br /> Map is included as Figure 2 The chain of custody document and laboratory analytical reports are also <br /> attached <br /> incerely, <br /> 0 GEpt <br /> �igc ` 'Z`E`N J. <br /> Project Coordinator'A; y <br /> it/7" a No.5577 <br /> Stephen J Cart r 4P �2r <br /> Senior Geologist, R G No 5577 F0F CALF <br /> Figure 1 Potentiometric Map <br /> Figure 2 Concentration Map <br /> Table 1 Groundwater Monitonng Data and Analytical Results <br /> Table 2 Groundwater Analytical Results - Oxygenate Compounds <br /> isTable 3 Groundwater Analytical Results <br /> Attachments Standard Operating Procedure -Groundwater Sampling <br /> Field Data Sheets <br /> Chain of Custody Document and Laboratory Analytical Reports <br /> bei qMi <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 -7555 <br />