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NETTLER �- YA INC. <br /> September 26, 2003 <br /> G-R Job#280045 <br /> Page 1 of 2 <br /> Mr. Bob Hopkins <br /> Union Oil Company of California <br /> 276 Tank Farm Road <br /> San Luis Obispo,California 93406 <br /> RE: Third Quarter Event of August 26,27, 28, and 29,2003 <br /> Groundwater Monitoring & Sampling Report <br /> Former Unocal Service Station#0.187 <br /> 437 East Miner Avenue <br /> Stockton,California <br /> Dear Mr. Hopkins: <br /> This report documents the most recent groundwater monitoring and sampling event performed by Gettler-Ryan Inc. <br /> (G-R)at the referenced site. All field work was conducted in accordance with G-R Standard Operating Procedure- <br /> Groundwater Sampling (attached). A joint monitoring event was conducted with Former Vintage Car Wash, <br /> located at 601 East Miner Avenue, Stockton, California. <br /> Static groundwater levels were measured and all wells were checked for the presence of separate-phase <br /> • hydrocarbons. Separate-phase hydrocarbons were not present in the wells. Static water level data and groundwater <br /> elevations are summarized in Table 1. Joint Groundwater Monitoring Data and Analytical Results are presented in <br /> Table 6. Potentiometric Maps are included as Figures 1, 2 and 3. <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. Concentration Maps are included as Figures 4, 5 and 6. 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 /> • <br /> r <br /> Deanna L. Harding Q�tOf�SS/py <br /> Project Coordinator <br /> co <br /> Ems. Z <br /> . No. C 5573/4 r - <br /> _* Exp. l�ltQ�' <br /> Hagop Kevork (P�9� C1V11- <br /> P.E. No. C55734 F pF C A%-\ O" <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 />