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i <br /> � 6ETTLER - RYAN INC <br /> April 11, 2006 <br /> G-R Job#386843 <br />' Mr. Darin Rouse <br /> Chevron Environmental Management Company <br /> P.O.Box 6012,Room K2260 <br /> San Ramon, CA 94583 <br /> RE: First Quarter Event of March 2,2006 <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 />' Since y, <br /> �c <br /> 5XONAL G <br /> eanna L. Hardingc� p� <br /> Project Coordinator <br /> Q <br /> N W <br /> j7 /C� <br /> Robert A. Lauritzen - <br /> Senior Geologist, P.G.No. 7504 pPCAt��fl <br />' Figure 1: Potentiometric Map <br /> Figure 2: Concentration Map <br /> Table 1: Oro.rndwater 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 94558 a (925) 551.7555 - Fax (925) 551-7888 <br /> 3140 Gold Camp Drive, Suite 170 - Rancho Cordova, CA 95670 - (916) 631.1300 - Fax (916) 631 1917 <br /> 1364 N. McDowell Blvd., Suite 62 - Petaluma, CA 94954 - (707) 789-3255 - Fax (707) 789-3218 <br />