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V2 GETTLER - RYAN NC. - <br /> December 20, 1999 <br /> G-R Job #180138 <br /> Mr Edward C <br /> Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, California 95661 <br /> RE Fourth Quarter 1999 Groundwater Monitoring Sampling P& Sam lin 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 October 25, and 26, 1999, field personnel monitored eighteen wells (MW-1,MW-2, MW-4 <br /> through MW-9,MW-11,MW-14,MW-15,MW-16,VW-1 through VW-4,VW-7,and PTW-1) and sampled <br /> seventeen wells(MW-1, MW-2,MW-4 through MW-9,MW-11,MW-14, MW-15,MW-16,VW-1,VW-3, <br /> VW-4, VW-7, and PTW-1) at the above referenced site One well (VW-2) was dry <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 /> S erely, <br /> s <br /> ai <br /> GrnM� k ED GE0I <br /> Deanna L HardingJ.Cg9iP� <br /> Protect Coordinator r„ <br /> No.5577 <br /> Stephen J Carter to <br /> Senior Geologist, R G No 5577 �'9 OF <br /> CA <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-Oxygenate Compounds <br /> Table 3 Groundwater Analytical Results <br /> Attachments Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> 6981 qml Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 - 7555 <br />