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07 February 2001 AGE-NC Project No 95-0130 ' Page 2 of 8 2 1 CPT LITHOLOGIC SOUNDINGS Soil borings P-7, P-8, P-9 and P-10 were advanced vertically to total depths of 150 feet bsg utilizing a 25-ton truck-mounted CPT drill ng equipped with 2-inch diameter hollow-stem rods A hydraulic ram was utilized to advance a cone penetrometer tip to total depth of each CPT boring Soil parameters such as cone penetrometer tip resistance, sleeve friction, friction ratio (ratio between ' sleeve friction and tip resistance) and pore water pressure were continuously measured as the cone penetrometer was advanced to depth A continuous boring log was generated utilizing the Hogentogler Co CPT computer program The Hogentogler Co computer program utilized the CPT ' Soil Behavior Classification System (Robertson, P K , Campanella, R G, Gillespie, D and Greig, J 1986), to generate a general lithology type and display on a CPT boring log (See Appendix A) Rinseate generated during drilling activities was containerized in properly labeled DOT-approved t55-gallon drums, and stored on-site in an area lacking public access All soil borings were backfilled by inserting hollow rods to total depth of each boring and backfilling with a portland cement grout mix 22 STRATIGRAPHY Based on the findings from Cl'I soil borings P-7, P-8, P-9 and P-10, cross sections C-C' and D-D' were constructed and depict general lithology beneath the site(Figures 3 and 4) Generally, gran elly, Fine to coarse sand layers were observed at depths between 25 and 45 feet bsg, 70 and 75 feet bsg, 82 and 90 feet bsg and 130 and 150 feet bsg Generally, fine grained, silty clay and clayey silt layers ' were observed at depths between 10 and 25 feet bsg, 50 and 60 feet bsg, 90 and 105 feet bsg and between 115 feet and 125 feet bsg Variable lithology including silty fine sand, sandy silt and clayey silt to silty clay were observed at all other depths CPT computer generated boring logs are included ' in Appendix A 23 CPT DRILLING AND GROUND WATER COLLECTION PROCEDURES A 25-ton truck-mounted CPT drill ng equipped with 2-inch diameter hollow-stem rods fitted with a HydroPunch ground water sampling tool utilized a hydraulic ram to advance to specified depths in each soil boring A HydroPunch sample tool was pushed into the specified zone, then withdrawn approximately three feet to expose an inlet screen The interior of the sampling tool filled with kk ater ' and a ''/)-inch outer diameter(O D ) stainless steel bailer was lowered and utilized to extract a ground water sample Ground water samples were collected from each depth interval (zone) based on previously acquired CPT-lithology data indicating favorable conditions for sampling ground NA ater ' All rmscate generated during drilling activities was containerized in properly labeled DOT-approved 55-gallon drums, and was stored on-site in an area lacking public access All soil borings were Advanced GwEnvironmental,in, E i