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' 30 December 1998 <br /> �l AGE-NC Project No 95-0173 <br /> Page 12 of 12 <br /> recommendations After stabilization, routine maintenance would represent the only periods of <br /> "down time"for the unit One to two times each month (assuming 24-hour operation), the unit will <br /> be shut down for routine maintenance procedures such as lubrication, oil changing, and system <br /> adjustments <br /> 46 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 <br /> if 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 <br /> be transported in a cooler under ice to a DHS-certified laboratory for analysis of TPH-g, TPH-d, <br /> BTE&X,MTBE,DIPE,TAME,ETBE and TBA In accordance with EPA methods 8015m,8020 and <br /> 8260 <br /> I <br /> Advanced GeoEn�iron mental,Inc <br /> I <br />