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GETTLER - RYAN INC. <br /> July 29, 1998 <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 Second Quarter 1998 Groundwater Momtonng & 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 May 27, 1998, field personnel monitored thirteen wells (MW-1, MW-2, MW-4 through MW-9, <br /> MW-11, VW-1 through VW-4) and sampled twelve wells (MW-1, MW-2, MW-4 through MW-9, MW-11, <br /> VW-1, VW-3, and VW4) 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 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 /> kED GLw" <br /> ���O <br /> Deanna L Harding �ctj, <br /> Project Coordinator <br /> /J'� No. 5577 <br /> Stephen J Carte <br /> N <br /> Senior Geologist, R G No 5577 <br /> OF Op�,1FOQ► <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 /> Chain of Custody Document and Laboratory Analytical Reports <br /> 6981 qml <br /> 6747 Sierra Court , Suite J - Dublin , California 94568 ( 925 ) 551 -7555 <br />