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i <br /> I <br /> 22 January 1996 <br /> AGE-NC Project No. 95-0112 <br /> Page 5 of 5 <br />' 5.0. CONCLUSIONS & RECOMMENDATIONS <br /> 5.1. HYDROCARBON-RAPACTED SOIL <br /> Soil and ground water remediation systems were installed at the site in late July 1995. The initial soil <br /> vapor results indicate a considerable volume of hydrocarbons as gasoline from the subsurface. <br /> Additional soil vapor samples will be collected on a monthly to further monitor the mass of <br /> hydrocarbons removed. <br />' 5.2. HYDROCARBON-IMPACTED GROUND WATER <br />' An internal combustion engine-driven SVE system is being used to remove hydrocarbon vapors from <br /> the soil;a compressor-driven IAS system is being used to strip dissolved hydrocarbons from ground <br />' water. <br /> Petroleum hydrocarbons have not been detected in samples from wells MW-6 since installation in <br /> 1993;toluene has been detected only once in?VIW-S (0.4 ppb). Therefore, we recommend reducing <br /> the sampling frequency of these wells to bi-annual (twice a year). <br /> The relative movement of the dissolved hydrocarbon plume has not been substantial. However, the <br /> down gradient well at the site, well MVV-5, was found to contain TPH-g and benzene in two <br /> consecutive monitoring events. The PHS-EHD may require installation of an additional ground water <br /> monitoring well to accurately assess the dissolved hydrocarbon plume. The next quarterly ground <br /> water monitoring is scheduled for January 1995. <br /> 6.0. LIMITATIONS <br />' Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities. The findings were based upon <br /> analytical results provided by an independent laboratory. Evaluations of the geologic/hydrogeologic <br /> conditions at the site for the purpose of this investigation are made from a limited number of available <br /> data points(i.e. monitoring wells) and subsurface conditions may vary away from these data points. <br /> No other warranty, expressed or implied, is made as to the professional recommendations contained <br /> in this report.= <br /> 1 <br />