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V I <br /> 1 1 <br /> 07 July 2000 <br /> AGE-NC Project No 98-0448 <br /> Page 12 of 12 <br /> r <br /> All necessary well/boring permits will be submitted to the PHS-EHD prior to any drilling activities <br /> A minimum of 48 hours notice will be given to the PHS-EHD prior to performing any field work <br /> I <br /> 45 SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGING SYSTEM MAINTENANCE <br /> The SVEJAS system will be maintained on a weekly basis, according to manufacturers <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 /> Ibe shut down for routine maintenance procedures such as oil/filter changing, carbon canister <br /> replacement and system inspections and adjustments <br /> + - h <br /> Y f <br /> 4 6 PROGRESS AND CONFIRMATION SOIL SAMPLING <br /> IAfter approximately twelve months of operation or when a significant decrease of efficiency is <br /> noted, soil samples will be collected from the target remediation area Analytical results of the soil <br /> 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 <br /> be transported in a cooler under ice to a DHS-certified laboratory for analysis of TPH-g, BTEX, <br /> MTBE, DIPE, TAME, ETBE and TBA in accordance with EPA methods 8015m, 8020 and 8260 <br />■r` I <br /> Advanced GeoEnvironrnental,Inc <br />