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ACTON • MICKELSON • van DAM, INC. <br /> Consulting Scientists, Engineers, and Geologists <br /> 5090 Robert J. Mathews Parkway, #f4 (916) 939-7550 <br /> El Dorado Hills, California 95762 Fax (916) 939-7570 <br /> March 1, 1993 2;CSJYZJ <br /> MAR p 3 1993 <br /> Mr. Kenneth Earnest <br /> Ultramar Inc. ENVIRONMENTAL HEALTH <br /> 525 West Third Street PERMIT/SERVICES <br /> Hanford, California 93234 <br /> Subject: Soil Management and Remediation Work Plan Addendum <br /> Beacon Station #494, 2185 East Fremont Street <br /> Stockton, California <br /> Dear Mr. Earnest: <br /> Acton Mickelson van Dam, Inc. (AMV), was authorized by Ultramar Inc. (Ultramar), to prepare a Soil <br /> Management Plan (dated September 23, 1992) for handling of soil generated during the removal of three existing <br /> underground storage tanks (UST) and overexcavation of soil containing petroleum hydrocarbons at the subject site <br /> (Figures 1 and 2). The reason for this addendum is that results of further investigation performed at the subject <br /> site after the Soil Management Plan was submitted indicated that the extent of petroleum hydrocarbons in soil makes <br /> overexcavation economically unfeasible, and Ultramar's decision not to rebuild the station allows Ultramar the <br /> option of chosing a more cost effective method of remediation. <br /> In the original work plan, soil generated during the removal of the underground storage tanks was proposed to be <br /> segregated clean from dirty with the use of a pbotoionization detector and physical observations, sampled and taken <br /> to an appropriate landfill. This addendum proposes that soil generated during the removal of the UST be segregated <br /> clean from dirty, then returned to the excavation for later treatment by soil vapor extraction using vertical vapor <br /> extraction probe(s) and/or well(s). The only soil samples that are now proposed to be collected are those required <br /> for the tank closure, as discussed in the original Soil Management Plan. Figure 3 illustrates the proposed sequence <br /> of deposition of the overexcavated soils. Soil returned to the excavation will be compacted to 90%. A layer of <br /> visqueen will be placed between the clean and dirty soil to minimize vapors extracted from the clean soil. <br /> If you have any questions regarding this matter please contact me at (916) 939-7550. <br /> Sincerely, <br /> ACTON • MICKELSON • van DAM, INC.J <br /> Hal Hansen <br /> Hydrogeologist <br /> HEH:eaf/enc <br /> cc w/enc: Mr. Michael Infurna, San Joaquin County <br />