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28 October 1997 <br /> AGE-NC Project Na 95-0103 <br /> Page 2 of 3 <br /> UNff COMMONS AND OPERATIONS <br /> • Repairs made to the KWItIck 3011 vapor extinction (SVE) and over the past quarter <br /> included the overhaul of the Pwanadc blower and electric mow. and dwovery of a <br /> mamficture defied isolated to the COMMI panel of the SVE unit, thereby fi==sing the <br /> 0PV1WV9 UM of the SVE unit.This unit is equipped with a UWXW ps ignited M4wder, <br /> which is fed oxygen from the vent gas from the vapor extraction wells.Due to overall low <br /> OMM c=0*81k=in the vett pros,a Toa►qUW iW of smbim slat MM be bftd ccd Wo <br /> the SVE combustion train to allow the p jo--heater to min ignited.Failure of the pre.heater <br /> seri will cam a abut down of the SVE Wit-The ambient air or makeup gas introduction <br /> technique for combustion gas is the design of the SVE unit and thus reduces the oveml <br /> vacwm•cW"i ie4 of the SVE unit.Addnt onafiy,the support time to observe and maim <br /> the continual oixration of the SVE unit is put ar than;initially 40WpWc& <br /> Over the later portion of the month of September and through the month of October 1997, <br /> the SVE unit has operated with less thea twehv bons of inn-operational time.Through the <br /> third quarter of 1997, a total of 546 lbs. or 87 gallons of hydrocarbons as gasoline vme <br /> removed by the SVE unit. The mass calculations arc included in the Quarterly Report for <br /> August 1997. <br /> DISCUSSION <br /> The recent rise in ground water at the site has reduced the dkdvenems of the soil vapor <br /> system, limiting the Zone of vapor remval to a low permeable flay and <br /> requiem$ the openktion of TAS sYAM. Mw new site conditions will inctease the time <br /> required to remove the majority of tim hydnocubons from the site.Noting that the unit las <br /> cu=dY not operated with a sWMzed witus far Mm than thirty days,a review of the SVE <br /> effectiveness and expec*d&when is anticipated for March of 1998,to allow for a minuiimum <br /> of six morAhs of stable moa. <br /> • The reported utility operational costs have.been approximately$1,000 for the operation of <br /> the SVE.unit and LAS ground water system. Based on observed operating cost for similar <br /> SVEW technologies at other =wdiation sites, this utility cost is reasonable for the <br /> removal of the estimated quantity of hydrocarbons from the Chapin site.Additionally,the <br /> overall cleanup costs for this site have been min�by the otilizg&n of this KitWBuck <br /> SVE unit,requiring no c*wive use of the State's underground storage tank fund available <br /> for the Cham site or other tank sites. <br /> Quarterly and monthly monitoring snood continue <br /> .+drr�aar Geolr■rlrerr�reaq�,ore. <br />�' Z'd 8 1 It 49V 60C WNC161AMXM C33MAW WDMU WdVB= l LW 4-6Z-0 t <br />