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1 <br /> In regard to the research of wellhead treatment options, ASE began <br /> researching this issue last summer when your agency directed our client <br /> to provide an alternative drinking water supply to the affected residences <br /> at that time. During our research then, we reviewed a document sent to <br /> us by the Underground Storage Tank Cleanup Fund (USTCF), taken from a <br /> Soil Sediment & Groundwater Magazine article, explaining several <br /> treatment options. Recently we have briefly spoken to several agency <br /> regulators and researched the Internet for sources of information <br /> regarding treatment scenarios. The most common treatment scenarios <br /> within the article and from industry and agency sources were (a) <br /> activated carbon, and (b) air-stripping with an activated carbon polish. <br /> Recently, we have contacted several vendors (Calgon Carbon, 141P <br /> Systems [t e sr ,nn l:A. of the on-s�ittn. r.=n.G, 1ut.o <br /> . syst�nl], and Culligan <br /> Water) for their recommendation and proposals for wellhead treatment of <br /> two contaminated well scenarios; one with concentrations of MTBE less <br /> than 5 parts per billion (ppb) and one with MTBE concentrations between <br /> 100 and 200 ppb. All three vendors recommended using activated carbon <br /> systems for the treatment of well water with MTBE concentration less than <br /> 5 ppb. NEEPSystems, through its local vendor Slaby Sales, recommended <br /> a residential air stripper and activated carbon polish for wells affected <br /> with MTBE over 100 ppb MTBE. Since this project has domestic wells <br /> containing MTBE at concentrations in the range of both scenarios, ASE <br /> recommends the installation of both types of systems on two different <br /> wells for evaluation of cost and performance effectiveness. <br /> ASE recommends the installation of an activated carbon system for t h e <br /> affected well at the rear of the 17933 property owned by Mrs. Carol <br /> Copeland. This well contains MTBE at a concentration of less than 5 ppb. <br /> ASE recommends the installation of a residential air-stripper and activated <br /> carbon polish system for the affected well at the 17950 property owned <br /> by Ms. Zoe Haworth. This well contains N11BE at a concentration of 16 0 <br /> ppb. ASE's pilot study for these two scenarios will evaluate cost, ability of <br /> the system to remediate the MTBE, life expectancy of the activated <br /> carbon, ease or difficulty of operation and maintenance procedures, and <br /> schedule and results of sampling of the mid and effluent treated water. <br /> The outcome of the pending meeting regarding City supplied water a n d <br /> the performance of the proposed wellhead treatment options will be the <br /> basis for the alternative water supply for the remainder of the affected <br /> wells in the neighborhood. Ms. Lofstrom, we respectfully request your <br /> signature at the bottom of this letter to act as your agency's approval to <br /> proceed with the tasks detailed in this letter. <br /> -2- <br />