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INNIE NAL HEALTH OIR/1% :R1,',1T SERVICE3330 Data Drive Delta �' `= r '� Suite 100 12 P,� �' U Rancho Cordova, CA 95670 onants,I9161638-2085 Consultants,Inc. FAX:9161638-8385 September 29, 1993 Mr. Kenneth Earnest Ultramar Inc. 525 West Third Street Hanford, California 93230 e Subject: Addendum to Proposed closure Plan Beacon Station No. 696 2448 West Kettleman Lane Lodi, California Delta Project No. 40-93-916 Dear Mr. Earnest: Delta Environmental Consultants, Inc. (Delta), has been authorized by Ultramar Inc. to conduct a . hydrogeologic investigation at Beacon Station No. 696, located at 2448 West Kettleman Lane, Lodi, San Joaquin County, California (Figure 1). A copy of Delta's Proposed Closure Plan, dated May 26, 1993, has previously been submitted to the appropriate regulatory agencies for review. The proposed closure plan is intended to provide justification for regulatory closure of the site. This letter describes additional work to be performed as part of the investigation presented in the closure plan. The closure plan proposed drilling three on-site soil borings and one off-site soil boring to a depth of 50 feet below the surface, and submitting soil samples collected from depths of 10, 20, 30, 40, 45, and 50 feet for laboratory analyses of petroleum hydrocarbons. The proposed investigation will be modified by drilling two additional off-site soil borings. Each of the three off-site soil borings will be advanced to approximately 3 feet above the water table (approximately 52 feet). Soil samples will be collected from each of the off-site borings from immediately above the water table interface, and a Hydropunch sampling device will be used to collect ground water samples from the upper water table aquifer. The locations of the proposed soil borings are shown in Figure 2. The soil borings will be drilled and sampled in accordance with the methods described in Appendix A of the closure plan. Soil samples will be analyzed in the field for the presence of organic vapors using a photoionization detector (PID). The soil samples collected from just above the water table in each boring and the ground water samples, will be submitted for laboratory analyses of benzene, toluene, ethylbenzene, and xylenes, and total -petroleum hydrocarbons as gasoline, using methods approved by the U.S. Environmental Protection Agency and the California Department of Health Services. A quality assurance plan was presented in Appendix A of the closure plan. Delta Delivers Solutions