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REDNDD <br /> JAN 2 5 2002 3164 Gold Camp Drive <br /> Delta ENVIRONMENT HEALTH suite 200 <br /> Inak <br /> Rancho Cordova,CA 95670-6021 <br /> Environmental PERMIT/SERVICES U.S.A. <br /> Consultants,Inc. 916/638-2085 <br /> FAX:916/638-8385 <br /> January 23, 2002 <br /> Ms. Margaret Lagorio <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Street, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Work Plan for Excavation of Impacted Soil at ARCO Facility No. 6100, <br /> located at 25775 South Patterson Pass Road, Tracy, California <br /> Ms. Lagorio: <br /> Atlantic Richfield Company (ARCO) is currently in the process of upgrading the product <br /> piping at the subject site (Figure 1). Delta Environmental Consultants, Inc. (Delta) <br /> notified your office of this work in a letter dated January 7, 2002, when we requested <br /> permission to install piping for future remedial work. <br /> On January 18, 2002, Delta visited the site to collect compliance soil samples from the <br /> product piping trenches. Under the supervision of Mr. Dennis Catanyag (San Joaquin <br /> County Public Health Services), one sample was collected adjacent to the locations of <br /> each of the eight dispensers, and three samples were collected from the product piping <br /> trench between the dispensers and the underground storage tanks (USTs). These eleven <br /> soil samples were collected at depths between 3.5 and 6 feet below ground surface (bgs). <br /> Preliminary analytical data from the laboratory indicated that residual petroleum <br /> hydrocarbons were detected in all eight of the samples collected adjacent to the <br /> dispensers, with the highest concentrations encountered within the initial 5 feet bgs. <br /> Available analytical data are summarized in the attached table. Sample locations are <br /> shown on the attached site sketch(Figure 2). <br /> Based on these analytical data, Delta is proposing to perform limited excavation beneath <br /> the former dispenser islands. The proposed areas of excavation are indicated on the <br /> attached Site Map (Figure 1). This excavation work will remove impacted soil, and will <br /> facilitate installation of pans for the new dispensers. Excavations will extend to a depth <br /> of approximately 5 feet bgs. We estimate that approximately 100 cubic yards of soil will <br /> be excavated. Removed soil will be placed on and covered with plastic sheeting, and <br /> stored at the site pending disposal. <br /> Two confirming soil samples will be collected from each of the proposed excavations. <br /> These samples will be analyzed for TPHG and BTEX by DHS LUFT methods, for the <br /> Providing a Competitive Edge <br />