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r. <br /> INC.GETTLER - RYAN <br /> September 2, 1999 <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 Third Quarter 1999 Groundwater Monitot ing & 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 groundwatei monitoring and sampling event performed by Gettler-Ryan <br /> Inc (G-R) On July 15, and 16, 1999, field personnel monitored fourteen wells (MW-1, MW-2, MW-4 <br /> through MW-9, MW-11, VW-1 through VW-4, and PTW-1) and sampled thirteen wells (MW-1, MW-2, <br /> MW-4 through MW-9, MW-11, VW-1, VW-3, VW-4, and PTW-1) at the above referenced site One well <br /> (VW-2) had insufficient water to sample <br /> Static groundwater levels were measured and all wells wet e checked foi the presence of separate-phase <br /> hydrocarbons Separate-phase hydiocarbons 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 /> erely, <br /> � Lu/1 r '(FRED EQ� <br /> Deanna L Harding v�S vilAS J. �c <br /> o ect Coordinator <br /> No. em <br /> Dou as Lee <br /> Senior Geologist, R G No 6882 �'�► <br /> 9 <br /> Figure 1 Potentiometric Man of CA 1F <br /> Figure 2 Concentration Map <br /> Table 1 Groundwater Monitoring Data and Analyti4_al Result,, <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 qnd Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925) 551 - 7555 <br />