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I Work Plan for Characterization and Remediation of Stockpiled Sods ,duly 30, 1992 Manna Pro Facility, 4004 © Dorado Street, Stockton, CA 5 with the date and sampling location The samples will be stored on Ice, prior to being analyzed on site using a state certified mobile laboratory The mobile laboratory will be used to provide a timely method of determining baseline hydrocarbon concentrations in the stockpiled soils Groundwater Technology Standard Operating Procedures concerning soil sampling and handling are presented in IAppendix B The discrete samples will be composited (4 to 1) for analyses Twenty-five, four-part composite Isamples will be analyzed, representing one sample analysis per 160 cubic yards of soil Actual sample numbers may vary depending on the actual volume of stockpiled soil on-site, however, the analytical representation will remain the same per volume of soil Each composite sample will be analyzed for TPH-as-gasoline, TPH-as-diesel fuel, and BTEX using modified Environmental Protection Agency (EPA) methods 8020/8015 I Target criterd of petroleum hydrocarbons in soil for segregation purposes will be as follows[ TPH-as-Diesel Fuel Less than 100 mg/kg (ppm) TPH-as-Gasoline Less than 10 mg/kg (ppm) o Total BTEX Less than 1 mg/kg (ppm) t" V Soil samples which exceed the above target criteria will be considered to represent soil requiring remedial action prior to placement in the tank excavation Soil remediation is discussed as Task 3 Task 2: Backfilling After soil sampling and characterization has been completed, that soil meeting the above target criteria will be segregated and used to backfill the tank excavation Backfilling will proceed in individually compacted layers by a duly licensed contractor under the supervision of a qualified engineer Compaction testing will be performed to document compaction results I I I 2 The target criteria were chosen based upon data from UST programs in other California counties Santa Clara and San Mateo counties allow Impacted soils to be used as tank excavation backfill in cases where soil exceeds acceptable cleanup levels,the soil is allowed to be returned to the pit, however,additional remedial efforts would be required in situ IActual acceptable cleanup levels vary,and they are generally determined on a site-specific basis 14'GROUNDWATER TECHNOLOGY INC I