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14 September 2004 <br /> AGE-NC Project No 03-1100 <br /> Page 7 of 9 <br /> 3 5 PROGRESS/CONFIRMATION SOIL SAMPLING <br /> After approximately six-months of operation or after efficiency of the unit has declined,soil samples <br /> will be collected from the petroleum-hydrocarbon impacted area at the site Analytical results of the <br /> soil samples will serve to assess the remaining petroleum hydrocarbon mass and determine if <br /> continuing operation of the remediation system is necessary <br /> Probe borings for confirmation soil sampling will be advanced using a van-mounted Geoprobe 5400 <br /> direct-push probing unit equipped with 1 25-inch probing rods The Geoprobe advances soil probe <br /> borings using a hydraulic or pneumatic hammer to drive soil and ground water sampling tools to <br /> specified depths <br /> Soil samples will be collected using Geoprobe push-driven 2-inch diameter discrete samplers fitted <br /> with four six-inch long brass sleeves Discrete soil samples will be collected at five-foot intervals <br /> beginning at a depth of 40 feet bsg Upon removal from the sampler, the sample sleeves will be <br /> separated The exposed ends of the second sleeve will be covered with Teflon sheets, capped and <br /> sealed with tape Soil samples encountered in the borings will be visually classified by an AGE <br /> geologist in accordance with the Unified Soil Classification System (USCS) Additionally, soil <br /> samples will be field-screened for the presence of volatile organic compounds using an OVM <br /> Following sample collection, each preserved sample sleeve will be labeled with the boring <br /> designations, sample depth, sample time, sample date and sampler's initials Appropriately sealed <br /> and labeled samples will be placed in a chilled container under ice and transported under chain of <br /> custody to a DHS-certified laboratory <br /> 3 6 EQUIPMENT DECONTAMINATION AND BORING ABANDONMENT <br /> 1 <br /> All probing rods will be cleaned prior to advancement at each probe boring location All sampling <br /> tools used for sample collection will be thoroughly washed with a solution of Alconox and rinsed <br /> with clean water prior to use <br /> All probe borings will be permanently sealed to prevent vertical migration of contaminants Soil <br /> borings shall be abandoned by backfilling with cement slurry or neat cement mix from total depth <br /> to surface grade <br /> i <br /> Advanced GeoEnvironmental,Inc <br />