Laserfiche WebLink
a <br />111 <br />� 'SI <br />�I <br />li <br />Page 5 <br />Ms Margaret Lagono <br />March 23, 1995 lip <br />I I rill 11 <br />ilI <br />' Even though bioremediation is considered a more effective method of clean up <br />than groundwater extraction and treatment, it can still be relatively time 1 <br />consuming The fine grained soil at the site is not typically amenable to efficient <br />nutrient percolation The estimated time for remediation at the site using this <br />method is approximately 5 years The approximate cost for design, <br />implementation, operation and maintenance of this system is $300,000 00 <br />I sill <br />" <br />Air Sparging With Soil Vapor Extraction <br />Air sparging with soil vapor extraction is an aggressive form of remediation by <br />1 I , om, ansae <br />which air is injected into the groundwater below the zone of impact The air stream <br />' migrates up through the groundwater causing the transfer of contaminants from <br />the dissolved phase to the vapor phase The contaminants are released in the <br />vadose zone where they are recovered by the soil vapor extraction (venting) <br />' system Injected air also serves beneficially by introducing oxygen into the <br />subsurface, which assist naturally occurring microorganisms to degrade <br />.contaminants " <br />Burlington has successfully performed an air sparging and soil venting pilot test at <br />' this facility Test results are contained in the February 1, 1995 Final Remediation <br />Plan Additional field observations and laboratory results obtained during that test <br />are included in Attachment 1 of this addendum <br />r 1 ' <br />The volatile components of gasoline are typically suited to air sparging <br />remediation The potential to achieve the stringent regulatory cleanup objectives <br />' required at this facility are enhanced by an aggressive form of remediation The <br />estimated time to achieve cleanup levels is 2 years The approximate cost for <br />system installation, operation, and maintenance of this system is $200,000 00 <br />_ RECOMMENDATION <br />Based on the stringent regulatory clean up levels required at this facility, the need <br />> to implement an, aggressive remedial technology, the cost of system <br />implementation, and the estimated time of clean up, Burlington recommends that <br />air sparging and soil vapor extraction be utilized Burlington has already submitted <br />the detailed design of this system to the County Equipment is already staged at <br />this facility for system installation Schedules have been developed for its <br />implementation The applicable air permit"request has been submitted Therefore, ' <br />1 <br />E <br />