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4i3 GETTLER - RYAN INC. <br /> May 28, 2002 <br /> G-R Job #180183 <br /> Mr Edward C Ralston <br /> Phillips 66 Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, California 95661 <br /> RE. Second Quarter Event of April 29, 2002 <br /> Groundwater Monitoring & Sampling Report <br /> Tosco (Circle K) Unit#01205 <br /> 16470 Cambridge Street <br /> Lathrop, California <br /> Dear Mr Ralston <br /> This report documents the most recent groundwater monitoring and sampling event performed by Gettler- <br /> Ryan Inc (G-R) at the referenced site All field work was conducted in accordance with G-R Standard <br /> Operating Procedure - Groundwater Sampling (attached) <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 /> Sly, <br /> RED GS <br /> Deanna L Harding <br /> Prof ct oordinator �w 40� �cctc+`r'�► <br /> No 6882 <br /> Doug] J ee Q- <br /> Senior eologist, R G No 6882 <br /> OF CA41F��� <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 /> 012o5 qm1 <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 925) 551 - 7555 <br />