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GETTLER - RYAN INC. <br /> May 18, 2004 <br /> G-R Job 4386392 <br /> Mr Robert Cochran <br /> ChevronTexaco Company <br /> P O Box 6012, Room K2200 <br /> San Ramon, CA 94583 <br /> RE. Second Quarter Event of April 21,2004 <br /> Groundwater Monitoring& Sampling Report <br /> Chevron Service Station 49-1848 <br /> 1257 Yosemite Avenue <br /> Manteca,California <br /> Dear Mr Cochran <br /> This report documents the most recent groundwater monitoring and sampling event performed by Gettler- <br /> Ryan Inc (G-R) at the referenced site All field work was conducted in accordance with G-R Standard <br /> Operating Procedure-Groundwater Sampling(attached) <br /> Static groundwater levels were measured and the wells were checked for the presence of separate-phase <br /> hydrocarbons Static water level data, groundwater elevations, and separate-phase hydrocarbon thickness (if <br /> any)are presented in the attached Table I A Potentiometric Map is included as Figure I <br /> Groundwater samples were collected from the monitoring wells and submitted to a state certified laboratory <br /> for analyses The field data sheets for this event are attached Analytical results are presented in the table(s) <br /> listed below A Concentration Map is included as Figure 2 The chain of custody document and laboratory <br /> analytical report are also attached <br /> Please call if you have any questions or comments regarding this report Thank you <br /> Sincerely, <br /> t <br /> QRpFESslo <br /> pPKpjLq� <br /> Deanna L Harding Q <,` <br /> Project Coordinator 'A 2G3 <br /> co <br /> CC No C 55734 rn <br /> m <br /> Exp <br /> Hagop Kevorkj CIVIL <br /> P E No C55734 F <br /> OF C ALIFOQ' <br /> Figure I 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 /> Attachments Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> • Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court, Suite J • Dublin, CA 94568 • (925) 551-7555 • Fax (925) 551 7868 <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 />