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I 15 March 2002 i AGE-NC Project No 97-0249 ' Page 2 of 10 ' discrete"grab" ground water samples were collected by revisiting locations of each initial CPT soil boring via an adjacent boring advanced within two feet of the initial boring Grab water samples collected from the adjacent borings shared the same designation as the original CPT boring CPT ' boring logs are presented in Appendix A, a site plan depicting boring locations is presented in Figure 2 21 CPT LITHOLOGIC SOUNDINGS ' Soil borings P-13 and P-15 were advanced vertically to approximate depths of 150 feet bsg utilizing a 25-ton, truck-mounted CPT drill rig equipped with 2-inch diameter hollow-stem rods, soil borings P-14, P16, P-17 and P-18 were advanced to depths between 117 feet and 136 % feet bsg before I encountering drilling refusal 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 CPT boring logs (See Appendix A) Rinseate generated as a result of various drilling activities was containerized in properly labeled DOT-approved 55-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 SOIL DISTRIBUTION Although soil distribution may vary at each boring, AGE interprets the CPT data collected from soil boring P-13 to represent the typical soil types beneath the site (Appendix A) Generally, permeable, gravelly, silty sand and fine to medium sand was encountered at depths between 37 and 46 feet bsg, 60 and 76 feet bsg, 94 and 105 feet bsg, 115 feet and 120 feet bsg and 135 to 148 feet bsg Generally, less permeable, stiff fine grained, clay and silt were encountered at depths between 25 and 30 feet bsg, 55 and 60 feet bsg, 85 and 90 feet bsg, 105 and 110 feet bsg and between 125 feet and 135 feet bsg Variable lithology, including silty fine sand and sandy silt were encountered at all other depths Based on the findings from soil borings P-13, P-14, P-15, P-16, P-17 and P-18, geologic cross sections D-D',E-E'and F-F'were constructed to depict general lithology beneath the site (Figures 3, 4 and 5, respectively), CPT computer generated boring logs are included in Appendix A Advanced GeoEnvironmental,Inc