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� 6ETTLER - RYAN INC. <br /> September 11, 2003 <br /> G-R Job #180137 <br /> Mr Edward C Ralston <br /> ConocoPhillips <br /> 76 Broadway Avenue <br /> Sacramento, California 95 818 <br /> RF,• Third Quarter Event of August 4 and 5,2003 <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 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 Static water level data and groundwater elevations are <br /> summarized in Table l A Potentiometric 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 /> Deanna L Harding f <br /> 0 GFG� <br /> Project Coordinator <br /> C <br /> 0 <br /> * EXP <br /> Robert C Mallory <br /> Registered Geologist, No 7285 OF <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 /> $886 qml Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court, Suite J • Dublin, CA 94568 • (925) 551-7555 • Fax (925) 551 7888 <br /> 3140 Gold Camp Drive, Suite 170 • Rancho Cordova, CA 95670 • (916) 631-1300 • Fax (916) 631-1317 <br /> 1364 N McDowell Blvd , Suite B2 • Petaluma, CA 94954 • (707) 789-3255 • Fax (707) 789-3218 <br />