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GETTLER - RYAN INC . <br /> June 28 , 1999 <br /> G-R Job #180198 <br /> Mr. Edward C . Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville , California 95661 <br /> RE : Second Quarter 1999 Groundwater Monitoring & Sampling Report <br /> Tosco (Circle K) Unit #8671 <br /> 8606 Thornton Road <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 14 , 1999 , field personnel monitored and sampled four wells (MW- 1 through MW-4) <br /> at the above referenced 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 and 2 . A Concentration Map <br /> is included as Figure 2 . The chain of custody document and laboratory analytical reports are also attached . <br /> 4,a,na2I, <br /> ely , <br /> QED GJsVEC <br /> V GIJaS J SCC <br /> Harding <br /> cr O <br /> Project Coordinator <br /> No. 6882 <br /> Doug as Lee J+J $ <br /> Senior Geologist, R . G . No . 6882 �IFOF t;pl\FO�� <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 /> Attachments : Standard Operating Procedure - Groundwater Sampling <br /> Field Data Sheets <br /> Chain of Custody Document and Laboratory Analytical Reports <br /> 8671 .gm1 <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 925 ) 551 - 7555 <br />