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a <br /> 4Zi 6ETTLER - RYAN INC. <br /> October 7, 2005 <br /> G-R Job#3 86843 <br /> Mr. Darin Rouse <br /> ChevronTexaco Company <br /> P.O. Box 6012, Room K2260 <br /> San Ramon, CA 94583 <br /> RE: Third Quarter Event of August 29,2405 <br /> Groundwater Monitoring& Sampling Report <br /> Former Chevron Service Station #9-0557 <br /> 139 South Center Street <br /> Stockton, California <br /> Dear Mr. Rouse: <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). <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. 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 <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 /> Sincerely, <br /> Deanna L. Harding 4,551 A, SOC <br /> Project Coordinator O� Q� �90, <br /> No.7504 <br /> en <br /> Roert A. Lauritzen <br /> Senor Geologist, P.G.No. 7504 SOF CAL�FOQ <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: Groundwater Analytical Results <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) 551-7888 <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 9 (707) 789-3255 • Fax (707) 789-3218 <br />