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Suit Data Drive <br /> �/. Delta Ranc 100 <br /> Rancho Cordova,CA 95670 <br /> En�ironmenlai 9181638-2085 <br /> Consultants,Inc. FAX:916/638-8385 <br /> November 23, 1994 <br /> Mr. Kenneth Earnest c� rnc:�J <br /> Ultramar Inc. w <br /> 525 West Third Street <br /> Hanford, California 93230 <br /> 3 �r- <br /> Subject: Hydrogeologic Investigation Repon c rn <br /> Ultramar Station No. 696 CD <br /> 2448 West Kettleman Lane -- <br /> Lodi, California <br /> Delta Project No. D093-916 <br /> Dear Mr. Earnest: <br /> Delta Environmental Consultants,Inc. (Delta), was authorized by Ultramar Inc. (Ultramar)to conduct <br /> a hydrogeologic investigation at Ultramar Station No. 696, located at 2448 West Kettleman Lane, <br /> Lodi, San Joaquin, California. The purpose of this investigation was to evaluate remediation of <br /> petroleum hydrocarbons in soil and ground water beneath the site and provide justification for <br /> regulatory closure of the site. The work included collection of soil samples from six borings, <br /> collection of ground water samples from three of the borings, and completion of one of the soil <br /> borings as a soil vapor extraction well with multiple nested casings. This letter report presents the <br /> results of our investigation. Field work was conducted in accordance with the methods described in <br /> Enclosure A. The location of the site is shown in Figure I and site features are shown in Figure 2. <br /> Background <br /> Prior to acquisition of the site by Ultramar in July 1990, the site was owned and operated by <br /> Conoco, Inc. The presence of petroleum hydrocarbons in soil and ground water beneath the site was <br /> detected prior to 1985. Since that time, numerous investigations have been conducted at the site. <br /> There have been 36 ground water monitoring or soil vapor extraction wells installed at the site and <br /> on adjacent properties. A total of 20 of these wells, and a domestic water supply well, have been <br /> previously destroyed. Three single-walled underground fuel storage tanks were removed from the <br /> site in March 1989, and were replaced by three double-walled tanks. Remedial activities have <br /> included the installation of a soil vapor extraction system, which began operation in December 1989 <br /> and was turned off in April 1994. <br /> Soil BodWs <br /> On August 31, and September 1 and 2, 1994, confirmation borings CB-1, CB-2, and CB-3 were <br /> drilled to depths of approximately 55 to 60 feet below grade at locations southeast of the site. Soil <br /> samples were collected from each boring at 5-foot intervals, and ground water samples were collected <br /> from each boring using a Hydropunch sampling device. <br /> Prcviairg a :.cmpetitive Edge <br />