ARCHIVED REPORTS XR0007779 - Laserfiche WebLink

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s , 4 , 24 August 1995 . AGE-NC-95-0142 ' Page 6 of 6 oxygen concentrations should be measured in addition to pH, temperature and conductivity ' 5 2 HYDROCARBON HAPACTED SOIL Based upon analytical results of soil samples collected during this and past investigations at the site, it appears that hydrocarbon impacted soil extends approximately 30 feet northeast of the former TK1- ' 90 UST excavation Figure 4 indicates the approximate extent of hydrocarbon impacted soil The impacted soil appears to be distnbuted the entire vadose zone, beginning at a depth of approximately ' 15 feet and extending to the capillary fringe (approximately 40 foot depth) d Feasibility studies will have to be performed at the site to determine viable remediation options for impacted sod We recommend the installation of three additional soil borings at the site One boring should be placed should be placed immediately north of the TK1-90 excavation, a second boring should be placed southeast of the former TK1-90 excavation, and a third boring should be placed ' northeast of the TK1-90 excavation, between MW-3 and MW-4 The first bonng should be completed as a vapor extraction well, screened throughout the entire depth of contaminated soil The remaining two bonngs should be completed as vapor extraction observation wells (and can be used for extraction, if necessary) A soil vapor extraction test should then be performed to determine the feasibility of the treatment method Sod samples collected during drilling should also undergo microbiological analysis to determine the feasibility of bioremediation at the site Samples should be analyzed for microbiological numbers and types(aerobic or anaerobic) After feasibility testing has been completed, a Corrective Action Plan (CAP) or Final Remedial Plan (FRP) should be prepared outlining remediation options for the site 6.0. LIMITATIONS Our professional services were performed using that degree of care and skill ordinarily exercised by ,environmental consultants practicing in this or similar localities The findings were based upon analytical results provided by an independent laboratory Evaluations of the geologic/hydrogeologic conditions at the site for the purpose of this investigation are made from a limited number of data ' points(i a monitoring wells, ground water samples) and subsurface conditions may vary away from these data points No other warranty, expressed or implied, is made as to the professional recommendations contained in this report