Laserfiche WebLink
l lav ton <br /> Ms L„aune 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 tormer UST <br /> and MW-3 (Figure 2) The excavation proLcss 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 (OVM) to <br /> assure that all contaminated soils are excavated Confirmation samples will be <br /> collected from the excavation walls and anal}zed by the following Environmental <br /> Protection Agency (EPA) methods <br /> EPA Method 5030/8015-8020, for TPH as gasoline and BTEX <br /> EPA Method 418 1, for total recoverable hydroLarbons 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 /> layer (approximately sit inches thick) on a polymeric liner that protects surface <br /> soils. To remain in compliance wtth the Air Pollution District guidelines, a <br /> m=nium: of 300 cubic yards of soil will be acro-ed per day <br /> As a satety measure, the excavation area will be temporarily fenced and the walls <br /> of the excavation will be sloped. <br /> • TA.;K 4 - SOIL AERATION AND MONITORING <br /> The excavated soils will be periodically rototilled to expose additional sods 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 Iicensed 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 ate activities, background soil sampling and <br /> laboratory analysis, and our conU..sions and recommendations <br /> :9S11 u,RJ-P <br />