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1 � In regard to the research of wellhead treatment options, ASE began researching this issue last summer when your agency directed our client to provide an alternative drinking water supply to the affected residences at that time During oui reseai ch then eve reviewed a document sent t o us by the Underground Storage Tank Cleanup Fund (USTCF), ta',en from a Soil Scdimcnt & Gioundvvatei Ma-,zine article, CXplainirg several treatment options Recently we have briefly spoken to several agency iegulatois and researched the Internet foi sources of information iegarding treatment scenarios The most connmon treatment scenarios within the article and from industi y and agency soul ces wei e ( a ) activated carbon, and (b) air-stripping with an activated carbon polish Recently we have contacted several vendors (Calgon Carbon hllP Systems [the sur pl.e, of the on-s.te re�,ed,ut. .t sysz n—,] a-�1 Culligan Water) for their recommendation and proposals for wellhead treatment o f two contaminated well scenarios, one with concentrations of MTBE less than 5 parts per billion (ppb) and one with MTBE concentrations between 100 and 200 ppb All three vendors recommended using activated carbon systems for the treatment of well water with MTBE concentration less than 5 ppb ITEEP Systems, through its local vendor Slaby Sales, recommended a residential air stripper and activated carbon polish for wells affected with MTBE over 100 ppb MTBE Since this project has domestic wells containing MTBE at concentrations in the range of both scenarios, ASE recommends the installation of both types of systems on two different wells for evaluation of cost and performance effectiveness ASE recommends the installation of an activated carbon system for the affected well at the rear of the 17933 property owned by Mrs Carol Copeland This well contains MTBE at a concentration of less than 5 ppb ASE recommends the installation of a residential air-stripper ane activated carbon polish system foi the affected %,ell at the 17950 propert\ owned by ;xa roc Ha�oi-th This well contains N i�BE, aL a c-QF1ce11trdti0n of 1 60 ppb ASE's pilot study for these two scenarios will evaluate cost ability of the system to remediate the MTBE, life expectancy of the activated carbon, ease or difficulty of operation and maintenance procedures, and schedule and results of sampling of the mid and effluent treated water The outcome of the pending meeting regarding City supplied water and the performance of the proposed wellhead treatment options will be the • basis for the alternative water supply for the remainder of the affected wells in the neighborhood Ms Lofstrom, we respectfully request your signature at the bottom of this letter to act as your agency's approval to proceed with the tasks detailed in this letter