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17 September 2001 <br /> AGE-NC Project No. 98-04.68 <br /> Page 5 of 7 <br /> 3.0. SCOPE OF WORK <br /> Based on the results of the previous investigations the vertical extent of MTBE impact to ground <br /> water has not been delineated. One.ground water monitoring we11•has been installed to a depth of <br /> 35 feet bsg, residual MTBE has been detected in the deep well for two sampling events. The <br /> investigation of the extent of MTBE at the site will consist of the following tasks: <br /> Permitting and pre-field work activities; <br /> Soil sample collection ah&analysis; <br /> In-situ.ground water sample collection and analysis; <br /> • ,Ground water sample collection and analysis; and <br /> Report preparation. <br /> Each of these-tasks is described in greater detail below. <br /> 3.1.- PERMITTING AND PRE-FIELD WORK ACTIVITIES <br /> Applicable site assessment permits will be obtained from the PHS-EHD. In addition, a health,and <br /> safety plan will be prepared in accordance with Occupational Safety and Health Guidance Manual <br /> for Hazardous Waste Site Activities (National Institute' for Occupational Safety and Health <br /> Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, .1985). Prior to <br /> mobilization, the monitoring well Iocation will be clearly marked and an utility clearance obtained <br /> through Underground Service Alert. <br /> 3.2. . PROBE BORING ADVANCEMENT AND IN-SITU GROUND WATER SAMPLE <br /> COLLECTION AND ANALYSIS <br /> AGE proposes to advance two additional,probe borings in the vicinity of wells MW-4, MW-6,and <br /> down-gradient in the area of wells MW-7 and MW-8. The location of the proposed probe borings <br /> is illustrated in Figure 2. <br /> Two probe boring will be advanced to a depth of approximately 45 feet bsg. Total depth of the probe <br /> boring may be based on field observations and field screening using an organic.vapor monitor <br /> (OVM). Grab ground water samples will be collected from,the probe boring at the 40 and 45 feet <br /> . intervals.Field procedures for advancement of probe borings and collection of ground water samples <br /> are presented in Sections 4.1 and 4.2, respectively. <br /> Advanced GeoEnvironmental,Inc. <br />