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APR 16 1993 <br /> ENVIRONMENTAL, HEALTH <br /> PERMIT/SERVICE: <br /> • APPLIED ENVIRONMENTAL SOLUTIONS, INC. <br /> 2530 Berryessa Road, Suite 809 <br /> San Jose, CA 95132 <br /> Mr. Gerald A. Sperry March 18, 1993 <br /> Pestana Properties Job # 402 <br /> 1818 Grand Canal Blvd. <br /> Stockton, CA 95207 <br /> Subject: Ground water sampling of Pestana Properties at 275 Grant <br /> Line Road, Tracy, CA. <br /> Dear Sir, <br /> On February 5, 1993, Applied Environmental Solutions, Inc. (AES) <br /> collected ground water samples from the site located at 275 Grant <br /> Line Road, Tracy, California. This action was in response to a <br /> sampling request from the Public Health Services of San Joaquin <br /> County, regarding possible hydrocarbon contamination of ground <br /> water beneath the site. <br /> Water samples were collected from each of the three monitoring <br /> wells located on-site. Prior to sample collection, water levels <br /> were measured and each well was purged. Approximately eight well- <br /> volumes of water were purged from each well and stored in a labeled <br /> 55-gallon drum. Prior to sampling, the purged wells were allowed <br /> to recharge to a minimum of 80 percent of the initial water level <br /> measurement. Water samples were then collected, and poured into <br /> amber one-liter bottles and 40 ml vials . After being filled, the <br /> bottles were sealed with a teflon lined plastic screw cap, inverted <br /> to verify that air bubbles were not present, labeled, and placed on <br /> ice inside a thermally insulated cooler for subsequent transport to <br /> a state certified laboratory. The insulated cooler also contained <br /> a thermometer to assure that the samples were kept at approximately <br /> 4°C until transfer to the laboratory. Proper Chain-of-Custody <br /> procedures were followed. <br /> The water samples were submitted to Priority Environmental Labs of <br /> Milpitas, California ( State-certification #1708) and analyzed for <br /> detection of Total Petroleum Hydrocarbons as gasoline (TPHg) using <br /> EPA method 5030/8015; Benzene, Toluene, Ethylbenzene, and Total <br /> Xylenes (BTEX) using EPA method 502; Total Petroleum Hydrocarbons <br /> as diesel (TPHd) using EPA method 3510/8015; Total Oil and Grease <br /> using EPA method 5520 E&F; and Purgeable Halocarbons using EPA <br /> method 601 . The samples were labeled MW-1A, MW-2A, and MW-3A to <br /> correspond to the well labels . The analytical results from Well <br /> MW-2 indicated that TPHg, Toluene, Ethylbenzene, Total Xylenes, and <br /> PESTANA PROPERTIES PAGE 1 OF 3 <br />