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,. � GETTLER - RYAN INC. <br /> June 13, 2003 <br /> G-R Job#180175 <br /> Mr. Edward C.Ralston <br /> ConocoPhillips <br /> 76 Broadway Avenue <br /> Sacramento,California 95818 <br /> RE: Second Quarter Event of May 12 and 13, 2003 <br /> Groundwater Monitoring&Sampling Report <br /> Tosco(Former BP Oil),Service Station.#11195 <br /> 16500 South 1-5 <br /> Lathrop, California <br /> Dear Mr. Ralston: <br /> This report documents the most recent groundwater monitoring and sampling events performed by Gettler-Ryan Inc. <br /> (G-R)at the referenced site. All field work was conducted in accordance with G-R Standard Operating Procedure- <br /> Groundwater Sampling(attached). <br /> Static groundwater levels were measured and all wells were checked for the presence of separate-phase hydrocarbons. <br /> Separate-phase hydrocarbons were not present in the wells. A Potentiometric Map is included as Figure 1. Dissolved <br /> Oxygen Concentrations are presented in Table 3. Static water level data and groundwater elevations are summarized <br /> in Table 1. <br /> 2 Groundwater samples were collected from the monitoring wells and submitted to a state certified laboratory for <br /> analyses. The field data sheets for this event are attached. Analytical results are presented in the table(s)listed below. <br /> A Concentration Map in included as Figure 2. The chain of custody document and laboratory analytical report are <br /> also attached. <br /> Please call if you have any questions or comments regarding this report. Thank you. <br /> Sincerely, <br /> 4 <br /> v <br /> eanna L. Harding GE <br /> Proj ec oordinator NSt C �p <br /> O <br /> �k No.7 85 �k <br /> obert C. Mallory �j, E ' <br /> Registered Geologist,No. 7285 '97fiOF CA��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 /> Table 3: Dissolved Oxygen Concentrations <br /> Attachments: Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> 11195.gm1 Chain of Custody Document and laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J Dublin , California 94568 (925 ) 551 - 7555 <br />