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c. <br /> 6ETTLER - RYAN_ 1 N <br /> December 26, 2002 <br /> G-R Job#180137 <br /> Mr Edward C Ralston <br /> ConocoPhillips <br /> 76 Broadway <br /> Sacramento, California 95812 <br /> RE: Fourth Quarter Event of November 20 and 21,2002 <br /> Groundwater Monitoring &Sampling Report <br /> Tosco (Unocal) Service Station #5886 <br /> 2701 West March Lane <br /> Stockton, California <br /> Dear Mr Ralston <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 fieldwork 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 Static water level data and groundwater elevations are <br /> 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 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 is included as Figure 2 The chain of custody document and laboratory analytical reports are <br /> also attached <br /> Sincerely, <br /> uafy�_ Gl <br /> I <br /> w <br /> Deanna L Harding <br /> Project Coordinator G GE��oc <br /> No 7285 ;< <br /> Exp of <br /> Robert C Mallory q <br /> Registered Geologist No 7285 OF CA�.� <br /> Figure 1 Potentiometric Map-Shallow Zone <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 /> 5886gm1 Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 (925) 551 -7555 <br />