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T - R YA N INC.ET LER <br /> May 28, 2004 <br /> G-R Job #386843 <br /> Mr. Robert Cochran <br /> ChevronTexaco Company <br /> P.O. Box 6012, Room K2200 <br /> San Ramon, CA 94583 <br /> RE: Second Quarter Events of April 23, 2004 <br /> Groundwater Monitoring& Sampling Report <br /> Former Chevron Service Station #9-0557 <br /> 139 South Center Street <br /> Stockton, California <br /> Dear Mr. Cochran: <br /> This report documents the well development and the most recent groundwater monitoring and sampling event <br /> performed by Gettler-Ryan Inc. (G-R) at the referenced site. All field work was conducted in accordance with <br /> G-R Standard 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. <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 /> S' cerely, <br /> blyllQRpFESS/0 <br /> Deanna L. Harding �``�AQP KF�i ,1 <br /> Project Coordinator co <br /> LU <br /> uJ cc No, C 55734 m <br /> Hagop Kevork (P <br /> P.E. No. C55734 '9T16, Vit- <br /> Figure <br /> 1LFigure 1: Potentiometric Map OF CAL 1F'3 <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 • (707) 789-3255 • Fax (707) 789-3218 <br />