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ary <br /> 6ETTLER. - RYAN INC. <br /> February 24, 2000 <br /> G-R Job#180138 <br /> Mr Edward C Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, California 95661 <br /> RE First Quarter 2000 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 Inc <br /> (G-R) On January 27 and 28, 2000,field personnel monitored eighteen wells (MW-1,MW-2,MW-4 through <br /> MW-9,MW-11,MW-14,MW-15,MW-16,VW-1 through VW-4,VW-7,and PTW-1)and sampled seventeen <br /> wells(MW-1,MW-2,MW4 through MW-9,MW-11,MW-14,MW-15,MW-16,VW-1,VW-3,VW-4,VW-7, <br /> 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 /> ihydrocarbons Separate-phase hydrocarbons were not present in the wells Static water level data and <br /> groundwater elevations are summarized in Table 1 A Potentiometnc 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 Map <br /> is included as Figure 2 The chain of custody document and laboratory analytical reports are also attached <br /> Sincerely, <br /> Deanna L Harding <br /> Project Coordinator y ty <br /> NO.5W <br /> Stephen J Carter , <br /> Semor Geologist,R G No 5 577 OF C FIFO <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 /> Table 3 Groundwater Analytical Results <br /> Attachments Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> ml jqw Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925) 551 - 7555 <br />