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i 1 5 at <br /> f ' f <br /> k <br /> 14 November 1995 <br /> .' AGE-NC Project No 95-0121 <br />�t Page 20 of 20 _ R <br /> I In-situ bioremediation of ground water is cost-effective, but as with in-situ bioremediation of soil, <br /> special monitoring requirements unposed by many regulatory agencies reduce the cost effectiveness <br /> r , <br /> r <br /> Combined with SVE, an IAS system"mechamcally/physically" strips hydrocarbons without the need <br /> of adding any chemicals or microbe solution into the environment It is a better known and more <br /> widely accepted method of volatilizing hydrocarbons As IAS has few if any adverse environmental <br /> effects, it is likely to be more readily approved for implementation by regulatory agencies Based upon <br /> these considerations, we recommend the installation of an IAS system for remediation of ground <br /> water at the Nomellirn site <br /> We estunate that the IAS system will require the installation of 12 to 16 sparging points (wells) At <br /> least four sparging points should'be installed off-site, east of the Nomellim property, the remaining <br /> points should be placed on-site Proposed IAS point locations are illustrated on Figure 6 <br /> Air should be supplied to each of the IAS points via underground piping by a compressor or blower- <br /> driven IAS unit capable of approximately 10 to 15 scfin <br /> Similar to soil remediation at the site, the IAS system will be evaluated after one-year If IAS has' <br /> failed to reduce longer-chain hydrocarbon concentrationIin ground water, additional or alternative <br /> remediation systems will be considered If bioenhancement/biostimulation is performed for <br /> remediation of impacted soil, similar methods will be considered for use in ground water <br /> 10.0. LIMITATIONS <br /> f <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localitie's 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 a monitoring wells, soil borings) and subsurface conditions may vary away from these <br /> data points No other warranty, expressed or implied, is made as to the professional recommendations <br /> contained in this report , <br /> 3 <br /> i <br /> 1 <br /> p A L <br /> f t <br /> 5 5 <br /> 1 <br /> f1 1 <br /> h <br /> I 5 <br />