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MrW <br /> 001 Gww_ <br /> Clayton <br /> Ms. Laurie Cotulla <br /> June 11, 1990 <br /> Page 4 <br /> • TASK 2 - SOIL EXCAVATION <br /> Clayton proposes to excavate soils to groundwater in the vicinity of the former UST <br /> and MW-3 (Figure 2). The excavation process will be supervised by a Clayton <br /> geologist or environmental engineer. We estimate excavation of about 300 cubic <br /> yards of soil. Operations will be monitored with an organic vapor meter (OVIV[) 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 (EPA) methods: <br /> - EPA Method 503018015-8020, for TPH as gasoline and BTEX <br /> EPA Method 418.1, for total recoverable hydrocarbons and oil and arease <br /> • TASK 3 - SOIL AERATION <br /> Aeration of contaminated soils will be accomplished by spreading the soils in a thin <br /> layer (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 safety measure, the excavation area will be temporarily fenced and the walls <br /> of the excavation will be sloped. <br /> • TAJK 4- SOIL AERATION AND MONITORING <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 backlIlled 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 surveyor. - <br /> TASK 5 - FINAL REPORTING <br /> Upon completion of the project, Clayton will prepare.a report.summarizing the <br /> findings. This report will include site activities, background soil sampling and. <br /> laboratory analysis, and our cone;usions and recommendations. . <br />