Laserfiche WebLink
12 October 1995 <br /> AGE-NC Project No. 95-0112 <br /> Page 6 of 6 <br /> 5.0. CONCLUSIONS & RECOMMENDATIONS <br />' 5.1. HYDROCARBON-IMPACTED GROUND WATER <br /> ' Petroleum hydrocarbon concentrations in ground water continue to fluctuate at the site. However, <br /> the areal extent of hydrocarbon-impacted ground water continues to be centered near MW-1. Similar <br /> to results of previous monitoring events, Wells MW-6, MW-7 and MW-8 are located in the up- <br /> gradient location of the dissolved hydrocarbon plume; MW-5 remains near the down-gradient extent <br /> of the plume. <br /> ' Petroleum hydrocarbons have not been detected in samples from wells MW-6 and MW-8 since their <br /> installation in 1993. Therefore, we recommend reducing the sampling frequency of MW-6 and MW-8 <br /> to bi-annual (twice a year). The next quarterly ground water monitoring is scheduled for October <br /> ' 1995. <br /> ' 5.2. SOIL AND GROUND WATER REMEDIATION <br /> M Soil and ground water remediation systems were installed at the site in late July 1995. An internal <br /> combustion engine-driven soil vapor extraction unit is being used to remove hydrocarbon vapors from <br /> the soil; a compressor-driven air sparging unit is being used to strip dissolved hydrocarbons from <br /> t ground water. Progress of the remediation systems will be reported quarterly. Initial results of the <br /> remediation systems will be presented in the Quarterly Report for October 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/hydrogeoiogic <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 />