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* el INC.6ETTLER - RYAN February 26, 2003 G-R Job#180183 Mr Edward C Ralston ConocoPhillips 76 Broadway Sacramento, California 95818 RE: First Quarter Event of January 24, 2003 Groundwater Monitoring & Sampling Report Tosco(Circle K)Unit#01205 16470 Cambridge Street Lathrop, California Dear Mr Ralston This report documents the most recent groundwater monitoring and sampling event performed by Gettler- Ryan Inc (G-R) at the referenced site All field work was conducted in accordance with G-R Standard Operating Procedure -Groundwater Sampling (attached) Static groundwater levels were measured and all wells were checked for the presence of separate-phase hydrocarbons Separate-phase hydrocarbons were not present in the wells Static water level data and groundwater elevations are summarized in Table 1 A Potentiometric Map is included as Figure 1 Groundwater samples were collected from the monitoring wells and submitted to a state certified laboratory for analyses The field data sheets for this event are attached Analytical results are presented in the table(s) listed below A Concentration Map is included as Figure 2 The chain of custody document and laboratory analytical reports are also attached Sin ely, Deanna L Harding �OFESSIO Project Coordinator Q P K 4" C Hagop Kevork UJ No. C 5573 P E No C55734 „f Exp. Figure 1 Potentiometric Map ��qJ CIVIL Figure 2 Concentration Map F OF G AL1Fp4` Table 1 Groundwater Monitoring Data and Analytical Results Table 2 Groundwater Analytical Results-Oxygenate Compounds Attachments Standard Operating Procedure-Groundwater Sampling Field Data Sheets Chain of Custody Document and Laboratory Analytical Reports 01205 qml 46 6747 Sierra Court , Suite J - Dublin , California 94568 ( 925 ) 551 - 7555