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E T T L E R YA N <br /> INC. <br /> December 26, 2002 <br /> G-R Job#180175 <br /> Mr. Edward C. Ralston <br /> .ConocoPhillips <br /> 76 Broadway <br /> Sacramento,California 95812 <br /> RE: Fourth Quarter Event of November 18 and 19,2002 <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 /> l <br /> This report documents the most recent groundwater monitoring and sampling event 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 /> 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 /> Deanna L. Harding <br /> Project Coordinator gt C GFOl0Q <br /> * No.7285 <br /> Exp.S4 <br /> Robert C. Mallory d',, <br /> Registered Geologist No. 7285 q OF CA�1F0�- <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 /> u,ys.ymi Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 - 7555 <br />