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• ; <br /> r 3164 Gold Camp Drive <br /> RQ Suite 200 <br /> ti�rr Rancho Cordova.CA 95670 <br /> Environn�errtal 916/638-2085 <br /> Consultants,Inc. FAX:916/638-8385 <br /> December 4, 1995 <br /> Mr. Kenneth Earnest <br /> Ultramar Inc. <br /> 525 West Tbird Street <br /> Hanford, California 93230 <br /> Subject: Work Plan for Confirmation Soil Borings <br /> Beacon Station No. 695 <br /> 900 South Cherokee Lane <br /> Lodi, California <br /> Delta Project No. D093-915 <br /> Dear Mr. Earnest: <br /> Delta Environmental Consultants, Inc. (Delta), has been authorized by Ultramar Inc. to confirm the <br /> effectiveness of soil vapor extraction at Beacon Station No. 695, located at 900 South Cherokee Lane, <br /> Lodi, San Joaquin County, California(Figure 1). The proposed work includes drilling and sampling <br /> of six soil borings, and if warranted the completion of selected borings as soil vapor extraction wells <br /> (Figure 2). <br /> Project Back and <br /> A soil vapor extraction system began operating at the site in July 1991. The underground fuel <br /> storage tanks were removed in January 1994. Ground water is present in monitoring wells at a depth <br /> of approximately 70 feet below surface grade (bsg). As of September 20, 1995, 45,189 pounds <br /> (7,319 gallons)of vapor equivalent gasoline has been extracted from the soil underling the site. Soil <br /> vapor sample analytical results indicate concentrations of petroleum hydrocarbons in soil have been <br /> reduced to acceptable levels. <br /> Scogs of Work <br /> The proposed work includes drilling six soil borings to depths of 65 to 70 feet bsg at locations shown <br /> in Figure 2. Soil samples will be collected from each soil boring at 5-foot intervals and will be field- <br /> screened for the presence of petroleum hydrocarbon vapors with a approved field screening device. <br /> Selected soil samples from each boring will be submitted for laboratory analysis of benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEI) using EPA Method 8015, total petroleum hydrocarbons <br /> (TPH) as gasoline, and TPH as diesel using EPA Method 8015 Modified. The methods to be used <br /> to drill and sample the soil borings are described in Enclosure A. <br /> Selected borings may be completed as soil vapor extraction wells depending upon field screening <br /> results and/or laboratory results. If decided that soil vapor extraction wells are to be constructed, <br /> 2-inch diameter, flush-threaded, Schedule 40 PVC casing will be used. If conditions warrant, <br /> multiple strings of casing may be run within each boring. Proposed soil vapor extraction well <br /> construction details are included in Enclosure B. <br /> Providing a Competitive Edge <br />