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EN <br /> V'RotiMrNT4 HE <br /> PfFli� fiRffC <br /> ~ a g 3330 Data Drive <br />• DQ� � 5 rL� Suite 100 <br /> c <br /> �6 P11 2' C Rancho Cordova, CA 95670 <br /> + 2 <br /> „ ��Q O~nvironmental 9161638-2085 <br /> Consultants,Inc. FAX:916/638-8385 <br /> February 3, 1995 <br /> Mr. Harlin Knoll <br /> Environmental Health Division <br /> Public Health Services <br /> San Joaquin County <br /> 445 North San Joaquin Street <br /> Stockton, California, 95201 <br /> Subject: Work Plan for Well Destruction <br /> Beacon Station No. 502 <br /> 35 North Cherokee Lane <br /> Lodi, California <br /> Delta Project No. D093-907 <br /> Dear Mr. Knoll: <br /> Delta Environmental Consultants, Inc. (Delta), has been authorized by Ultramar Inc. (Ultramar) to <br /> destroy four soil vapor extraction wells at Beacon Station No. 502, located at 35 North Cherokee <br /> Lane, Lodi, San Joaquin County, California. The wells are located adjacent to underground fuel <br /> storage tanks which are to be removed in approximately two to three weeks. The location of the site <br /> is shown in Figure 1 and a site map is included as Figure 2. <br /> Project Background <br /> The presence of petroleum hydrocarbons in soil beneath the site was detected during lining of <br /> underground fuel storage tanks in 1987. Since that time, investigative activities at the site have <br /> included the installation of five ground water monitoring wells, measurement of water levels in the <br /> wells to determine ground water flow direction, and sampling of the wells to evaluate ground water <br /> quality. Remedial activities included the installation of a soil vapor extraction system, which was in <br /> operation at the site from 1989 to 1992. Ground water is present at the site at a depth of <br /> approximately 50 feet below surface grade. <br /> Scope of Work <br /> The proposed work includes destruction of soil vapor extraction wells VW-5, VW-7, VW-8, and <br /> VW-9. Each well is constructed of 2-inch diameter Schedule 40 PVC casing and is approximately <br /> 40 feet deep. The wells are to be destroyed by pressure grouting with a neat cement/bentonite slurry. <br /> The grout will be emplaced from the bottom up by pumping through a tremie pipe. <br /> Enclosed are a well destruction permit and a check in the amount of$89. Due to the scheduled date <br /> for tank removal, an expedited review of this work plan would be greatly appreciated. <br /> Providing a Competitive Edge <br />