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- 6ETTLER - RYAN INC. <br /> August 18, 2004 <br /> GR.lob#386940 <br /> Mr. Robert Cochran <br /> ChevronTexaco Company <br /> P.O. Box 6012, Room K2200 <br /> San Ramon, CA 94583 <br /> RE: Second Semi-Annual Event of July 29,2004 <br /> Groundwater Monitoring& Sampling Report <br /> Former Texaco Service Station <br /> 368 East F Street <br /> Oakdale, California <br /> (Site# 211295) <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 1. A Potentiometric Map is included as Figure 1. Dissolved Oxygen <br /> Concentrations are presented in Table 3. <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 /> FSR_ O QRDFESS/o <br /> Deanna L. Harding `� G�P KF�0 <br /> Project Coordinator 7 <br /> CD <br /> CC No. C5573, s <br /> * EXP <br /> Hagop Kevork <br /> P.E.No. C55734 qtCc GYVIL ��\P <br /> OF CAL1F0 <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: Dissolved Oxygen Concentrations <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 • (707) 789-3255 • Fax (707) 789-3218 <br />