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I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />i <br />I <br />I <br />I <br />I <br />! <br />I <br />I <br /> <br />Mrs, Susan Beale <br />Page Two <br /> <br />Unfortunately, many contaminants may be harmful to human health at concentrations <br />which are too low to be detected by smell or taste. For this reason it is very <br />important that filtration systems are regularly maintained and their effluent <br />sampled in order to assure their performance. However, it may be difficult to <br />predict the necessary maintenance schedule for a system which filters ground <br />water near a waste disposal site. lhts is because ground water quality may <br />change with time and thus shorten the effective life of the filter. <br /> <br />As I hope is clear, the selection, installation and maintenance of a home <br />filtration system is not a simple proposition. MPCA staff believe that con- <br />tinued monitoring instead of a filtration system is appropriate for residential <br />monitoring wells which are not contaminated. <br /> <br />For further information on home filteration systems you may wish to obtain a <br />publication from the Freshwater Society titled 'Water Filters, Their Effect on <br />Water Quality." Single copies are available at no cost from: <br /> <br />Ms. Ginny Lee <br />Freshwater Society <br />2500 Shadywood Road <br />Box 90 <br />Navarre, Minnesota <br />612/471-7467 <br /> <br />55392 <br /> <br />If you wish to further discuss the uses and limitations of home filtration <br />systems, either Gary Englund at 612/623-5330 or Richard Clark at 612/623-5227 <br />of the Minnesota Department of Health may be able to assist you. <br /> <br />If you have any questions regarding this matter, please contact me or <br />Bruce Nelson of my staff at 612/296-7738. <br /> <br />S ly, ~ <br />/Rodney E~/ Massey, P.~/. <br />Chief, Regulatory ComPliance Section <br />Solid and Hazardous Waste Division <br /> <br />REM/BRN:cj <br /> <br />CC: <br /> <br />The Honorable John Hartinger, State Representative, St. Paul <br />Mr. Larry Johnson, E. A. Hickok and Associates, Inc., Wayzata <br />Mr. Peter Raatikka, Hakanson Anderson Associates, Inc., Anoka <br />Mr. Terry Miller, Waste Management of Minnesota, Inc., Anoka <br />Mr. Thomas Kalitowski, MPCA, Roseville <br />Mr. Robert Hutchison, Anoka County Community Health Services, Anoka <br />Mr. Gary Englund, Minnesota Department of Health, Minneapolis <br />Mr. Richard Clark, Minnesota Department of Health, Minneapolis <br /> <br />m <br /> <br /> <br />