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05 February 1999 w AGE-NC Project No. 98-0433 ' Page 3 of 9 ' 3.2. PROBING AND SAMPLING AGE proposes to advance up to fifteen soil probe borings using direct push technology (DPT). Probe ' borings will be advanced to depths of between 20 and 35 feet below surface grade (bsg). Additional soil borings may be required to delineate the release of soil and/or ground contamination and-may be added to the initial scope of work, based on field observations. Proposed probe boring locations ' are illustrated on Figure 2. Locations of outlying probe boring locations may be modified based on field findings as work progresses. ' AGE initially proposes to advance probe borings in the following areas: • Near the former dispenser island area; and 1 - • Near the former UST locations. ' InitiallY,probe borings within the former dispenser area will be advanced to depths of 20 feet, probe borings near the former UST locations will-be advanced to depths of 30 feet. However, total depths - of probe borings will be based on field observations and field screening using an organic vapor monitor (OVM). ' Soil and grab ground water samples will be collected from each probe boring. Field procedures for advancement of borings and collection of samples are presented in Section 4.1. At least one sample from each boring will be submitted for laboratory analysis. ' 3.3. MONITORING WELL INSTALLATION AND DEVELOPMENT AGE proposes to install up to five ground water monitoring wells at the site. Each ground water ' monitoring well will consist of 20 feet of well screen. The anticipated monitoring well locations are noted on Figure 2,but final locations will be determined based on findings from the probe borings and existing ground water monitoring data. Final monitoring well locations will be selected with ' approval by the PHS-EHD. The well screen section will be installed across the observed water table level with fifteen feet of ' screen section extending below the ground water table level and five feet of screen extending above the water table. Based on the observed ground water table level,it is anticipated that the total depth of the monitoring wells will be approximately 30 feet bsg. Following well installation, the wells will be developed in order to maximize water flow into the well casing and minimize the amount of fine-grained sediment drawn into the wells during pumping Advanced GeoEnvironmental,Inc.