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43 6ETTLER - RYANINC. <br /> March 7, 2006 <br /> G-R Job#386855 <br /> Mr Darin Rouse <br /> Chevron Environmental Management Company <br /> P O Box 6012, Room K2260 <br /> San Ramon, CA 94583 <br /> RE: Firstuarter Event of January 26,2006 <br /> Groundwater Monitoring & Sampling Report <br /> Former Chevron Service Station#9-8632 <br /> 575 Grant Line Road <br /> Tracy, California <br /> Dear Mr Rouse i <br /> This report documents the most recent groundwater monitoring and sampling event performed by Gettler-Ryan <br /> Inc (G-R) at the referenced site All field work was conducted in accordance with G-R Standard Operating <br /> Procedure - Groundwater Sampling (attached) A Joint groundwater monitoring event was conducted with <br /> Tosco (Former BP Oil) Service Station #11194, located at 2375 Tracy Boulevard and with Unocal (Former <br /> Scotty's) Service Station, located at 574 West Grant Line Road, Tracy, California <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 1 Joint groundwater monitoring data is presented in Tables 3 and 4 A <br /> 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 <br /> below A Concentration Map is included as Figure 2 The chain of custody document and laboratory analytical <br /> report are also attached <br /> Please call if you have any questions or comments regarding this report Thank you <br /> Sili-,, <br /> C-, <br /> Deanna Harding 1 S��ONA� Gc� <br /> Project Coordinator O Q� LQ(j�4C0 <br /> ir <br /> a W-No 7504 <br /> Robert�Launt n 9>. <br /> Senior Geolo is , P G No 7504 F Q` <br /> g OF 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 <br /> Table 3 Joint Groundwater Monitoring Data-Tosco(Former BP Oil) <br /> Table 4 Joint Groundwater Monitoring Data-Unocal (Former Scotty's) <br /> Attachments Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> Chain of Custody Document and laboratory Analytical Reports <br /> 6747 Sterra 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 />