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S <br /> GETTLER -- RYAN I <br /> NC. <br /> 4 <br /> August 12, 2004 <br /> G-R Job#386844 <br /> Mr. Robert Cochran <br /> 1 ChevronTexaco Company t <br /> P.O. Box 6012, Room K2200 <br /> ' San Ramon,CA 94583 <br /> RE: Third Quarter Event of July 21,2004 <br /> Groundwater Monitoring& Sampling Report <br /> Former Chevron Service Station 49-6258 <br /> i 2409 East Main at F Street <br /> ,i Stockton, California <br /> Dear Mr. Cochran: <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 /> i Procedure- Groundwater Sampling(attached). <br /> C/ 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 /> 1 any)are presented in the attached Table 1. A Potentiometric Map is included as Figure 1. <br /> 1 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 /> a report are also attached. <br /> Please call if you have any questions or comments regarding this report. Thank you. <br /> Sincerely, <br /> E, <br /> 7 1 <br /> QR4Fl:SS/0 <br /> ' Deanna L.Harding ��O QP KtC �q! <br /> Project Coordinator <br /> No. C 55734 M <br /> * <br /> Exp. <br /> Hagop Kevork �+ <br /> '? P.E.No. C55134 <br /> Figure 1: Potentiometric Map UP CAL%V�j I <br /> Figure 2: Concentration Map <br /> Table I.- Groundwater Monitoring Data and Analytical Results <br /> Table.2: <br /> Groundwater Analytical Results <br /> Attachments: Standard Operating Procedure-Groundwater Sampling # <br /> Field Data Sheets <br /> Chain of Custody Document and Laboratory Analytical Reports <br /> t <br /> _ 6747 Sierra Court, Suite J • Dublin, CA 94568 • (925) 551-75.55 • Fax (925) 551-7888 <br /> 3140 Gold Camp Drive, Suite 170 • Rancho Cordova, CA 95670 • (916) 631-1300 • Fax (916) 631-1317 i <br /> 1364 N.,McDowell Blvd., Suite B2 • Petaluma, CA 94954 • (707) 789-3255 <br /> Fax (707) 789-3218 <br />