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t <br /> 09 April 2002 <br /> AGE-NC Project No 95-0141 <br /> Page 9of13 <br /> monitoring well drilling and soil sample collection, monitoring well installation, development and <br /> survey, equipment decontamination and boring abandonment are outlined below <br /> 4 1 CPT ADVANCEMENT AND GROUND WATER COLLECTION <br /> The CPT soil borings will be advanced to a depth of approximately 150 feet bsg utilizing a 25-tan <br /> truck-mounted CPT drill rig equipped with 2-inch diameter hollow-stem rods Each CPT boring <br /> location will consist of two boreholes The first soil boring will utilize a hydraulic ram to advance <br /> a cone penetrometer to the desired depth Soil parameters such as cone bearing pressure, sleeve <br /> friction, friction ration and pore water pressure will be measured as the cone penetrometer is <br /> advanced A second soil boring will be located adjacent the first CPT boring to collect ground water <br /> samples from targeted intervals identified in the initial CPT boring <br /> 4 1 1 Ground Water Sample Collection <br /> I • Based on CPT findings, discrete grab ground water samples will be collected in intervals of porous <br /> and permeable material beginning at a depth of 70 feet bsg A HydroPunch sample tool will be <br /> pushed into the specified zone, then withdrawn approximately three feet to expose an Inlet screen <br /> The interior of the sampling tool fills with water and a 1-inch outer diameter (O D ) stainless steel <br /> bailer will be lowered and utilized to extract a ground water sample Grab ground water samples will <br /> be collected in intervals of porous and permeable material Following sample collection, the samples <br /> will be placed in laboratory-supplied containers, labeled with the location, sample designation,depth, <br /> time,date and sampler's Initials,placed in a chilled container and transported under chain-of-custody <br /> to a DHS-certified laboratory <br /> 4 1 2 Boring Abandonment <br /> All CPT borings will be permanently sealed to prevent vertical migration of contaminants Soil <br /> borings shall be abandoned by backfilling with Portland cement from the total depth to surface grade <br /> Following borehole advancement, portland cement (grout mix) will be utilized to backfill each <br /> borehole utilizing a trenue pipe The EHD will be given the opportunity to inspect the grout mix <br /> prior to backfilling the borings <br /> Advanced GeoEnvirotunental,Inc <br />