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�r <br /> f•1 <br /> PROBLEM ASSESSMENT REPORT <br /> Moore Petrotem, Inc. <br /> 5941 f Street, Bente, CA <br /> WGA Project No, 10-90-481 <br /> Page 10 <br /> 5.0 REMEDIATION ALTERNATIVES <br /> 5.1 soil <br /> Soil analytical results from soil samples taken at the siteto date <br /> indicate that, in general; concentrations of petroleum constituents <br /> in site soils . are low and that the . areal :extent of`'petroleum <br /> consti'tuents .in site soils is •limited. The minimum 2-inch-thick <br /> layer of asphalt covering the site should serve to greatly diminish <br /> _ infiltration of precipitation through unsaturated site soils (the <br /> uppermost ten feet), thereby limiting the soil moisture content of <br /> unsaturated soils. Because soil moisture content is the main <br /> limiting factor of transport in the unsaturated zone, the potential <br /> for transport of hydrocarbons through. the unsaturated zone to the <br /> water table is probably low. Because of the limited known extent <br /> of petroleum constituents in site soils, and the likely low <br /> potential for transport of known hydrocarbons through the <br /> unsaturated zone to the water table, it is our professional opinion <br /> that a soil remediation plan for this site is not warranted at this <br /> time. <br /> The:foregoing discussion assumes: 1) that the known distribution <br /> of hydrocarbons in site soils is in fact the actual distribution <br /> of hydrocarbons, and 2) there is no on going release of <br /> �- hydrocarbons into site soils. Should either of these assumptions <br /> be false, there Would likely be majoradverse effects on ground.-- <br /> water remediation at the site. To -:.ful^them :inVes"tigate -these . <br /> asst ioiions we—pro pose `the'-followTincl: <br /> .0 Critically, examine tank inventory records for USTs at the <br /> site. This examination would include plotting of daily <br /> tank variances, tank variance frequency, and cumulative „ <br /> tank variances for a period of one year. <br /> Place small-diameter boreholes at selected locations <br /> within the tank backfill. soil samples of tank backfill <br /> material would be collected from the boreholes and <br /> submitted to a California-certified laboratory and <br /> analyzed for BTEX, EDB, EDC, and TPH. <br /> A further assessment of the need for a soil remediation plan at <br /> this site will be made following the completion of these . <br /> activities. <br />