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i <br /> i r <br /> q�) �` 1386 E. BEAMER STREET <br /> " V Y E E- WOODLAND,CA 956959603 <br /> WESTERN GEO-ENGINEERS FAX (316) 662-0273 <br /> CALIF.CONTRACTOR#513357 A CORPORATION (916) 662-4541 <br /> J -'F REGISTERED GEOLOGISTS <br /> MR. John Rutherford June 5, 1990 <br /> DESERT PETROLEUM <br /> P.O. Box 1601 <br /> Oxnard, CA 93032 <br /> (805) 644-6784 <br /> RE: MAY, 1994, GROUND WATER SAMPLING AT DESERT PETROLEUM <br /> SERVICE STATION #787, 950 13th Street, Tracy, San Joaquin <br /> County, California, Section 29;T2S;R5E; MDB&M. <br /> Dear Mr. Rutherford; <br /> This report is being provided as documentation of our recent <br /> ground water sampling conducted on May 23, 1990. The project <br /> site is located in Section 29; T2S; R5E; MDB&M on the corner of <br /> and 9th Street in Trac California. <br /> lith Street a , y, -� <br /> The purpose of this investigation was to ascertain the quality of <br /> ground water beneath the site by: 1) recording depth to water (by <br /> use of a resistivity meter) for each monitor well; 2) "purging" <br /> and "containment" (secured, labeled 55 gallon drum) of ground <br /> water for each well; 3) collecting water samples from each well; <br /> 4) submiting these samples to a State Certified Analytical testing <br /> laboratory via established "chain of custody" procedures, and 4) <br /> i' determining the ground hater direction. These water samples were <br /> analyzed for Total Petroleum Hydrocarbons TPH and Volatile <br /> '4 y y { ) <br /> Aromatic Hydrocarbons (BTEX) using modified EPA Methods 8015 and <br /> 602 respectively. <br /> SITE INVESTIGATION <br /> The ground water was sampled in three monitoring wells by a <br /> Western Geo-Engineers (WEGE) geologist. Surface elevation, depth <br /> to water and ground water elevation were recorded for each well <br /> (WEGE: TABLE 1) . No floating product was observed in any of the <br /> wells . Each well was sampled after (approximately 2 1/2 gallons) <br /> of water were removed; the "purged" water was "contained" in a <br /> labeled, secured 55 gallon drum on site. From the well <br /> information, a ground water contour surface was plotted and a flow <br /> direction inferred (Figure 4I) . <br /> 9 <br />