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•• lk� <br /> 19 December 2003 <br /> AGE-NC Project No. 95-0128 <br /> Page 12 of 12 <br /> 4.5. PROGRESS/CONFIRMATION SOIL SAMPLING <br /> After approximately six months of operation or efficiency of the unit has declined, soil samples will <br /> be collected from the"core"petroleum hydrocarbon impacted area at the site. Analytical results of <br /> the soil samples will serve to approximate remaining petroleum hydrocarbon levels and determine if <br /> continuing remedial operation is necessary. <br /> Samples will be collected utilizing a direct push technology. AGE proposes to advance soil probe <br /> borings in the "core"petroleum hydrocarbon impacted area at the site to depths of approximately <br /> 50 feet bsg. Probe boring will be advanced using a Geoprobe 5400 soil probing unit. <br /> Discrete soil samples will be collected at five-foot intervals beginning at a depth of 10 feet bsg <br /> utilizing a Geoprobe soil sampling assembly loaded with pre-cleaned 1.125-inch by 6-inch brass <br /> sleeves.Soil samples will be preserved by covering both ends of the second brass sleeve with Teflon <br /> sheets,plastic end caps and sealed with tape. Each sample sleeve will be labeled with the following <br /> information:soil probe boring location,depth,time,date and sampler's initials.Soil samples will be <br /> transported in a cooler under ice to a DHS-certified laboratory for analysis ofTPH-g,TPH-d,BTEX, <br /> MTBE, DIPE, TAME, ETBE and TBA in accordance with EPA methods 8015m, 8020 and 8260. <br /> 4.6. BORING ABANDONMENT <br /> All borings not completed as monitoring or extraction wells will be permanently sealed to prevent <br /> vertical migration of contaminants. Soil borings shall be abandoned by backfilling with portland <br /> cement from the total depth to surface grade. <br /> 4.7. EQUIPMENT DECONTAMINATION <br /> All sampling tools used for sample collection will be thoroughly rinsed with clean water after being <br /> washed with a solution of Alconox. Drilling augers will be pressure washed prior to starting each <br /> boring. <br /> Advanced CeoEnvironmental,Inc. <br />