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r, • 09 January 2003 AGE-NC Project No. 95-0114 Page 2 of 9 • CPT-5 was advanced to 120 feet bsg at 75 feet northeast of monitoring well MW-10, on the Stockton Unified School site; • CPT-6 was advanced to 133 feet bsg at 180 feet northeast of monitoring well MW-10,or 110 feet northeast of CPT-5 on the Stockton Unified School site; and • CPT-7 was advanced to 113 feet bsg at 125 feet north of Harding Way,between monitoring well MW-10 and CPT-4 on the Stockton Unified School site parking area. The soil borings were terminated at the above-mentioned depths due to refusal encountered or equipment limitations during drilling activities. At each boring location, the soil parameters of cone penetrometer tip resistance, sleeve friction and pore water pressure were continuously measured as the cone penetrometer was advanced to depth. Utilizing the soil parameters,the Hogentogler Co. computer program interpreted general lithology types based on the CPT Soil Behavior Classification System (Robertson, P.K., Campanella, R.G, Gillespie, D, and Greig, J., 1986) and displayed the interpreted lithologies on a continuous CPT boring log. The CPT interpretive logs are presented in Appendix A. Rinseate 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. The CPT soil borings were backfilled over their entire depth range with a bentonite/portland cement grout mix. 2.2. GROUND WATER SAMPLE COLLECTION Following advancement of the initial boring to collect lithologic data, a HydroPunch ground water sampling tool was attached to the hollow-stem rod assembly and utilized to collect grab ground water samples at specified depths from an immediately adjacent,twin soil boring. The ground water samples were collected at the selected depths based on the previously acquired CPT lithologic log indicating favorable conditions for sampling ground water.Ground water sample was collected from the CPT borings at the following intervals: • CPT-1 was sampled between 74 feet and 80 feet bsg and between 116 feet and 120 feet bsg; • CPT-2 was sampled between 71 feet and 75 feet bsg and between 111 feet and 115 feet bsg; • CPT-3 was sampled between 46 feet and 50 feet bsg, between 58 feet and 62 feet bsg, and between 106 feet and 110 feet bsg; • CPT-4 was sampled between 71 feet and 75 feet bsg and between 106 feet and 110 feet bsg; Advanced CeoEnvironmental,Inc.