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(7ETTLER - RYAN INC. <br /> • <br /> June 2,2003 <br /> G-R Job#180183 <br /> Mr Edward C Ralston <br /> ConocoPhillips <br /> 76 Broadway Avenue <br /> Sacramento, California 95818 <br /> RE: Second Quarter Event of April 25,2003 <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 Potentiometnc Map is included as Figure 1 <br /> Groundwater samples were collected from the monitoring wells and submitted to a state certified laboratory <br /> for analyses The field data sheets for this event are attached Analytical results are presented in the table(s) <br /> listed below A Concentration Map is included as Figure 2 The chain of custody document and laboratory <br /> analytical reports are also attached <br /> Derely, <br /> Deanna L Harding <br /> Project Coordinator ED GEO <br /> O <br /> No A <br /> Robert C Mallory ` N�E D i�y <br /> Registered Geologist,No 7285 <br /> Figure I Potentiometnc Map -�Z F CAL�F� <br /> Figure 2 Concentration Map <br /> Table I Groundwater Momtonng 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 /> 01203 qmf <br /> • <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 925 ) 551 - 7555 <br />