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7 March ')000 AGE'-NC Project No. 98-0450 Page 18 of 19 the annulus and allowing them to settle on the filter pack. Bentonite chips will be hydrated Using five Gallons of water. The remaining annular spaces will be tilled to the ground surlace with a cement grout. The grout mixture will consist of Type I'll Portland neat cement and not more than ]0 gallons of water per 94-pound sack of'cement. The grout will be placed by PLIMping throu0h augers. A traffic-rated well box will be installed over the wells. in accordance with County regulations. 5.5. PROGRFSS!C'ONFiRMATION SOIL SAMPLING After approximately 12 months of operation or after efficiency ofthe unit has declined, soil samples Will be collected from the petroleum-hydrocarbon impacted area at the site. Analytical results of the soil samples will serve to assess the remaining petroleum hydrocarbon mass and determine if' continuing operation of the remcdiation system is necessary. Probe borings for con lirrnation soil sampling will be advanced usin�o a van-mounted Geopt 5400 direct-push probing unit equipped with 1.25-inch probing rods. The Geoprobe advances soil probe borings using a hydraulic or pneumatic hammer to drive soil and ground water sampling tools to specified depths. Soil samples will be collected using Geoprobe push-driven ?-inch diameter discrete samplers fitted with four six-inch long brass sleeves. Discrete soil samples will be collected at five-foot intervals beginning at a depth of 10 feet bsg. Upon removal from the sampler. the sample sleeves will he separated. The exposed ends of the second sleeve will be covered with Teflon sheets, capped and sealed with tape. Soil samples encountered in the borings will be visually classified by an AGF geologist in accordance witli the Unified Soil Classification System (USCS). Additionally, soil samples will be field-screened for the presence of volatile organic compounds using an OVM. Followino sample collection_ each preserved sample sleeve will be labeled with the boring designations. sample depth. sample time. sample date and sampler's initials. Appropriately sealed and labeled samples will be placed in a chilled container under icc and transported under chain-of- custodv to a DFiS-certified laboratorv. 5.6. EQUIPMENT DECONTAMINATION AND BORING ABANDONMENT Hollow stem augers will be cleaned prior to advancement in each borehole. All sampling tools used for sample collection will be thoroughly washed with a sotution ol'Alconox and rinsed with clean water prior to usc. All down-hole drilling and sampling equipment will be pressure washed prior to starting the borin�1. Advanced Gear?m ironmenfal.lite.