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25 August 1998 <br /> AGE-NC Project No. 98-0481 <br /> Page 3 of 7 <br /> TPH-d and TPH-g were detected at 140 and 1.9 ppm, respectively. In addition, concentrations of <br /> benzene, TPH-d, and MTBE were reported for the soil sample collected beneath the waste oil UST. <br /> Total lead was not detected at concentrations greater than 10 ppm in any of the soil samples <br /> analyzed. <br /> During the tank removal activities, excavated soil was stockpiled at the site. A total of five <br /> composite soil samples were collected from the stockpiles for laboratory analysis. TPH-d was <br /> detected in one composite stockpile sample; BTEX, MTBE, and TPH-g were detected in two <br /> composite stockpile samples. Elevated concentrations of total oil and grease, halogenated volatile <br /> organic compounds (HVOCs) and LUFT metals were detected in the composite sample collected <br /> from the waste oil UST stockpile. <br /> 2.3. REGIONAL GROUND WATER DEPTH AND FLOW DIRECTION <br /> According the information obtained from Ms. Carol Oz of the PHS-EHD, ground water depth in the <br /> vicinity of the site is approximately 60 feet bsg. Regional ground water flow direction is generally <br /> northwest to north-northeast. However, both ground water depth and flow direction at the site can <br /> vary seasonally. <br /> 3.0. SCOPE OF WORK <br /> Based on the results of the previous Phase 11 assessment and UST removal sampling, petroleum <br /> hydrocarbon impacts at the site appear limited to the area of the former fuel dispenser island, product <br /> piping, and former waste oil UST. Therefore, no additional assessment activities are proposed for <br /> the former location of the three fuel USTs. The investigation of the extent of petroleum hydrocarbons <br /> at the site will consist of the following tasks: <br /> • Permitting and pre-field work activities; <br /> • Soil sample collection and analysis; <br /> • Ground water sample collection and analysis; <br /> • Sampling and disposal of soil stockpiles (if appropriate); and <br /> • Report preparation. <br /> Each of these tasks is described in more detail below. <br /> • <br /> Advanced GeoEnvironmentsl,lne. <br />