Laserfiche WebLink
Clay tote <br /> Ma Laune Cotulla <br /> June ll, 1990 <br /> Page 4 <br /> • TASK 2 - SOIL EXCAVATION <br /> Clayton proposes to excavate bolls to groundwater in the vicin-ty 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 so:l Operations will be monitored with an organic, vapor meter (OVM) 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 4181, for total recoverable hydrocarbons and oil and grease <br /> • TASK I - 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 /> • TASK 4 - SOIL AERATION AND MONITORING <br /> The excavated soils will be periodically rototilled to expose additional soils to <br /> aeration One discrete cortirmation. sample for each 25 yd' of aerated soil will be <br /> collected and analyzed foI the contam:na.—.Lprev,ousiy rioted 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 well 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 summarising the <br /> findings This report will include site activities, background soil sampling and <br /> laboratory analysis, and our conclusions and recommendations <br /> 299100U P <br /> i <br />