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i • <br /> - YA N INC.ETTLER <br /> January 16, 2001 <br /> G-R Job#386845 <br /> Mr. Robert Cochran <br /> Chevron Products Company <br /> P.O. Box 6004 <br /> San Ramon, CA 94583 <br /> RE: Fourth Quarter Event of December 14,2000 <br /> Groundwater Monitoring & Sampling Report <br /> Chevron Service Station #94275 <br /> 2905 West Benjamin Holt Drive <br /> Stockton, California <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). A joint monitoring event was conducted with Arco <br /> Station #2133 located at 2908 West Benjamin Holt Drive, Stockton, California. The joint monitoring data is <br /> not included in this report. <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 <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 /> Zeaa <br /> ly, <br /> Q�,pFES8jo <br /> 1 <br /> L. Harding 0Op KELO�F2 <br /> � <br /> Project Coordinator � <br /> LU No. C 5573 M <br /> * <br /> Hagop Kevork Exp. <br /> Q <br /> P.E. No. C55734 s�q C `�1V <br /> T <br /> Figure 1: Potentiometric Map F OF C A1-�F� <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 , California 94568 ( 925 ) 551 - 7555 <br />