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08 April 1997 <br /> AGE-NC Project No. 95-0167 <br /> Page 2 of 4 <br /> A total of seven soil samples and one water sample were analyzed for total petroleum hydrocarbons <br /> quantified as gasoline (TPH-g) and volatile aromatic (benzene, toluene, ethylbenzene and total <br /> xylenes; BTE&X) according to EPA method 8015m and 8020/602, respectively. TPH-g and BTE&X <br /> were detected in soil samples collected from probe boring P2 at 20 feet and very slight <br /> contamination was present at 25 feet. Soil samples collected from P3 indicated TPH-g and BTE&X <br /> contamination at 10 feet. TPH-g was not detected in the grab ground water sample collected at the <br /> site. However, benzene; toluene and xylenes were detected in the ground water sample collected. <br /> Concentrations of BTE&X ranged from 1 .3 lig/l, (parts per billion) of benzene to- 4.8 ppb of toluene. <br /> 2.4 . GROUND WATER DEPTH AND FLOW DIRECTION <br /> Based upon ground water monitoring wells located on nearby properties, ground water depth at the <br /> site is estimated to be approximately 25 feet bsg. Regional ground water flow direction at the site <br /> I <br /> s north or northeast. However, locally ground water flow direction can vary seasonally. <br /> 3 .0. SCOPE OF WORK <br /> The analytical results from the installation of three probe boring samples indicates that ground water <br /> at the site is impacted by petroleum hydrocarbons . Therefore, the PHS-EHD has request the lateral <br /> and vertical definition of both the hydrocarbon-impacted soil and ground water. <br /> 3 . 1 . BORING ADVANCEMENT <br /> AGE proposes to advance five soil probe borings at the site to determine the lateral and vertical <br /> extent of hydrocarbon-impacted soil and ground water. Probe borings will be advanced using a <br /> Geoprobe 5400 probing unit equipped with 1 .25-inch probing rods. Each soil probe boring will be <br /> advanced to a depth of 25 feet bsg. <br /> One boring will be advanced north of the edge of the former UST excavation on the site, from which <br /> a grab water samples will be collected . A second boring will be advanced south of the edge of the <br /> former UST excavation. A probe boring will be advanced at an angle of approximately 25 ' from <br /> vertical beneath the building on-site, immediately north of the former dispenser. <br /> Two additional probe boring will be established for the purpose of collecting soil and grab water <br /> samples from the dispenser area and the a grab water sample from the parking lane of Fremont <br /> Street. <br />