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� v <br /> 0 <br /> A S S O C I A T E S I N C <br /> 4_2 Groundwater Analytical Results <br /> The groundwater sample collected from well MW2 contained elevated concentrations of TPHg, <br /> TPHd, toluene, ethylbenzene, and xylenes The TPHg concentration was 27,900 parts per billion <br /> (ppb), TPHd concentration was 6,730 ppb, and toluene, ethylbenzene, and xylenes concentrations <br /> ranged from 143 to 8,610 ppb The analytical data for the groundwater sample from well MW2 <br /> indicated that the TPHd result contained diesel and an unknown fuel hydrocarbon The <br /> groundwater sample from well MW2 did not contain detectable concentrations of oxygenate fuel <br /> additives although the detection limits were elevated due to high non-target concentrations <br />' The groundwater sample collected from well MWl contained TPHd at a concentration of 4,100 <br /> ppb The analytical data for the groundwater sample from well MW indicated that the detectable <br /> concentrations of TPHd did not match the chromatogram pattern for diesel, and was reported as <br />' an unidentified hydrocarbon C9-C24 The groundwater sample from well MW 1 did not contain <br /> detectable concentrations of TPHg, BTEX, or oxygenate fuel additives <br />' The groundwater sample from well MM3 did not contain detectable concentrations of TPHg, <br /> TPHd, BTEX, or oxygenate fuel additives Analytical results of groundwater samples are <br /> summarized in Table 3 <br /> 5.0 DISCUSSION <br /> Based on the analytical results and field observations, soil and groundwater beneath the location <br /> of the former USTs are impacted by TPHg and TPHd The lateral extent of impacted soil and <br /> groundwater appears to be defined to the north, west, and east The impacted soil and <br />' groundwater is not defined to the southeast, south, and southwest The vertical extent of <br /> impacted soil and groundwater has been defined and appears to be limited to above 35 feet bgs <br /> None of the soil or groundwater samples collected from the beneath the location of the former <br />' USTs contained oxygenate fuel additives In the judgment of ATC, additional site investigation <br /> activities are necessary <br /> w 1130991rep0rtsl5umwel dw 5 <br />