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6ETTLER - RYAN <br /> INC. <br /> January 9, 2006 <br /> G-R Job#386843 <br /> Mr. Darin Rouse <br /> ChevronTexaco Company <br /> P.O. Box 6012, Room K2260 <br /> San Ramon,CA 94583 <br /> RE: Fourth Quarter Event of November 29, 2005 <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 /> Lly, <br /> Deanna L. Harding ray, A Fa <br /> Project Coordinator �4 ,Q 0 <br /> 9L 0 CA <br /> N No.7504 ar <br /> kobbe4dLauritzen <br /> Senior Geologist, P. No. 7504 OPC 1-W, <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 , California 94568 { 925 ) 551 - 7555 <br />