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C:lavro.n <br /> Ms. Laurie Cotulla <br /> June 11, 1990 <br /> Page 4 <br /> • TASK M - SOIL EXCAVATION <br /> Clayton proposes to excavate soils to groundwatcr in the vicinity of the former [ ST <br /> and MW-3 (Figure 2). The excavation process will be supervised by a Clayton <br /> geolouist or environmental engineer. We estimate excavation of about 300 cubic <br /> yards of soil. Operations will be monitored with an organic vapor meter (QViv1) to <br /> assure that all contaminated soils are excavated. Confirmation samples will be <br /> collected from the excavation walls and analyzed by the following Environmental <br /> Protection Agency (EFA) methods: <br /> EPA Method 503018015-SO20, for TPH as gasoline and BTEX <br /> - EPA Method 418.1, for total recoverable hydrocarbons and oil and grease <br /> • TASK 3 - SOIL AERATION <br /> Aeration of contaminated soils will be accomplished by spreading the soils in a thin <br /> laver (approximately six inches thick) on a polymeric liner that protects surface <br /> soils. To remain in compliance with the Air Pollution District guidelines, a <br /> maximum of 300 cubic yards of soil will be aerated per day. <br /> As a safer, measure. the excavation area will be temporarily fenced and the walls <br /> of the excavation will be sloped. <br /> • TASK 4 - SOIL AERATION AND MOINITORING <br /> The excavated soils will be periodically rototilled to expose additional soils to <br /> aeration. One discrete confirmation sample for each 25 yd' of aerated soil will be <br /> collected and analyzed for the contaminants previously noted. Pending approval of <br /> your agency and the Regional Board. the remediated soil will be backfilled in the <br /> excavated hole and compacted. A new monitoring well will be placed in a Corner of <br /> the excavation for.future monitoring of baseline environmental conditions. This <br /> well will be resurveyed by a licensed land survevor. <br /> - - - - - -TASK 5:= FINAL REPORTING- <br /> Upon completion of tete project, Clayton will prepare.a report summarizing the <br /> findings. This report will includesite activities, background soil sampling and <br /> laboratory analysis, and our conclusions and recommendations. <br /> 7v53lw,itEP. - <br /> i <br />