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. Mr Kyle Christie Protect 0805-140 03 <br /> October 5, 1995 <br /> Page 5 <br /> Excavation of New Tank Complex and Samnluig <br /> • EMCON will observe excavation activities of the proposed new tank complex <br /> Because the location of the proposed tank complex is within an area that has <br /> been characterized, soil samples for laboratory analyses will not be collected from <br /> the base of the excavation However, the soil generated from the excavation will <br /> be screened in the field using a PID If field screening data indicate hydrocarbons <br /> are present in the upper 15 feet, overexcavation will occur and soil samples will <br /> be collected from these areas for laboratory analyses <br /> • Samples collected from overexcavation areas will be submitted to the laboratory <br /> for analyses of TPHG and BTEX using Modified EPA Methods 8015 and 8020, <br /> respectively <br /> Backfilling of Old Tank Cavity <br /> • Soil generated from the former tank cavity and product dispenser island will be <br /> used to backfill.the old tank cavity <br /> Initial Stockpiled Soil Samples <br /> ® EMCON is estimating that a maximum of 800 cubic yards of soil will be <br /> generated from the excavation and overexcavation of the gasoline USTs and <br /> product delivery lines Because the soil will be used to backfill the former tank <br /> cavity, composite soil samples will not be collected <br /> • EMCON is assuming that 50 cubic yards of soil will be generated from the <br /> excavation of the waste-oil tank One composite sample will be collected from <br /> soil generated The samples will be composited by the laboratory and will be <br /> analyzed for TPHG, BTEX, TOG, TPHD, CLHC, PCB's, PNA, cadmium, <br /> chromium, lead, nickel, and zinc using the methods discussed above <br /> • Soil generated from the new tank complex will be stored on site and covered <br /> with visqueen One composite sample will be collected from every 100 cubic <br /> yards of soil generated The samples will be composited by the laboratory and <br /> will be analyzed for TPHG and BTEX using the methods discussed above <br /> • Results of analyses of samples collected from the soil will be used by ARCO's <br /> contractors to evaluate disposal options <br /> i <br /> SACH 1ARCO\05481DESIGN108051400 3AS-95 wpt 3 <br />