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mow -.r 21 March 2003 AGE-NC Project No. 95-0114 Page 6 of 10 Select soil samples from each boring will be analyzed for: • Volatile organic compounds (VOCs) including BTEX by EPA Method 8260, and • Total petroleum hydrocarbons quantified as Stoddard solvents (TPH-ss) by EPA Method 8015 Modified. The pilot borings will be completed as multi-level ground water monitoring wells. The proposed screen intervals of the multi-level wells were based on interpretation of lithologic data collected during the November 2002 CPT investigation as well as previous investigations (Figure 3); screen intervals were located in zones identified as having preferential flow characteristics (porous lithology, increased pore pressure). The proposed screen-interval depths of the multi-level ground wells are: • Between 35 and 50 feet bsg to assess first encountered ground water(off-site eastern-most wells only); • Between 75 and 85 feet bsg to assess HU3 and HUS; • Between 115 and 125 feet bsg to assess HU6; • Between 140 and 145 feet bsg to assess the vertical extent of contaminated ground water. Following installation, each well will be developed to maximize water flow into the well and minimize the amount of fine-grained sediment drawn into the well during pumping or bailing. Procedures for well installation and development are presented in Sections 4.1.2 and 4.2, respectively. Ground water monitoring and sampling of each newly installed ground water monitoring well will be conducted on a quarterly basis; ground water samples will be analyzed for: • Volatile organic compounds (VOCs) including BTEX by EPA Method 8260 • Total petroleum hydrocarbons quantified as stoddard solvents (TPH-ss) by EPA Method 8015 Modified. Ground-water-sample collection procedures are described in Section 4.5.4. Advanced GeoEnvironmental,Inc.