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• 02 May 2001 AGE-NC Project No 96-0249 Page 4 of 5 4 1 CPT DRILLING AND GRAB GROUND WATER SAMPLE COLLECTION Based on significant petroleum-impact and the sandy lithology reported from borings P-11 and P-12 at depths as great as 120 feet bsg (Figures 3 and 4), additional CPT soil borings are proposed to target depths of approximately 150 feet bsg utilizing a 25-ton truck-mounted CPT drill rig equipped with 2-Inch diameter hollow-stem rods Initially, a CPT soil boring will utilize a hydraulic ram to advance a cone penetrometer to the desired depth Soil parameters such as cone bearing, sleeve friction, friction ration and pore water pressure will be measured as the cone penetrometer is advanced Rinseate generated during drilling activities will be containerized in properly labeled DOT-approved 55-gallon drums, and stored on-site in an area lacking public access A second soil boring will be located adjacent the initial CPT boring for ground water sample collection Based on CPT findings, discrete grab ground water samples will be collected in selected saturated intervals of porous and permeable material A HydroPunch sample tool will be pushed into the specified zone, then withdrawn approximately three feet to expose an inlet screen The interior of the sampling tool fills with water and a 1-inch outer diameter (O D ) stainless steel bailer will be lowered and utilized to extract a ground water sample Grab ground water samples will be collected • in intervals of porous and permeable material All rinseate generated during drilling activities will be containerized in properly labeled DOT-approved 55-gallon drums, and will be stored on-site in an area lacking public access Following sample collection, the samples will be placed in laboratory-supplied containers and transported under chain-of-custody to a DHS-certified laboratory Proposed soil boring locations are illustrated on Figure 2 Following borehole advancement,portland cement (grout mix)will be utilized to backfill each borehole utilizing a tremie pipe The PHS-EHD will be given the opportunity to inspect the grout mix prior to backfilling activities 4 2 EQUIPMENT DECONTAMINATION All sampling tools used for sample collection will be thoroughly rinsed with clean water after being washed with a solution of Alconox All down-hole drilling and sampling equipment will be pressure washed prior to starting the boring 43 SAMPLE HANDLING Ground water samples will be collected into laboratory supplied containers Ground water samples • for TPH-g, TPH-d, TPH-mo, BTEX,MTBE, EDB, 1,2-DCA, fuel oxygenate (EPA 8260) analyses Advanced GeoEnvironmental,Inc