12/3/1992 BOARD OF HEALTH Minutes

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i u MINUTES December ,! 1992 13 % BOARD OF HEALTH T Mr. McGrath commented, ' the maximum Title v removal is 36 percent, assuming ,there is s ate denitrification occurring in the leaching field" . "What I have been comparing consis- tently is that there is 65 percent removal from the house to the distribution box however, there will be some more removed in the leaching field. " "As a very conservative number there is probably an increase of 30 percent removal . Mr. Doherty questioned system maintenance, "One concern of this board is the filter media plugging up or a blowout. Mr, McGrath stated, "this was designed to have very little maintenance" . 'The loading rate is less than 2 gallons per square foot per day. " After four years, four months, the system in Falmouth was excavated down to the inlet of the "Ruck" filter~ and there was no clogging whatsoever. " Fused on that, we predicted that it would have a failure of some- where between 20 and 30 years, " "If it does fail it's a re- moval of that upper layer and replacement of new sand with the existing filters being reused, " 1120 to 30 years is just projection used on having no failure- " Mr. Devereux, abutter, questioned why all the experimen- tal lots were one acre or more. Mr. McGrath explained, "I needed a willing party that lip would allow periodic inspections for four years" . "I paid for the reconstruction of his septic system and it just hap- pened to be a friend who was agreeable to all this, " Mr, Devereux questioned Mr. McGrath as to whether there is any reason why this system will not function on this small piece of property. Mr, McGrath responded, "no" . Mr. Devereux questioned whether there will be any odors coming out of the vents. Mr. McGrath explained, "one gent goes up through the roof and will be tied into the plumbing stackil . "The other vent will be installed at ground level . "It can be in- stalled -anyplace, as long as, the air can get into it, so it can be disguised by landscaping. " "The times I have been near those vents in Falmouth there has been no oder. " "When e uncovered the system, even though the filter was being loaded by active sewerage, there was no odor. " "The smell of sewerage comes from the anerobic conditions when it's in the septic tank, but when it's in an airoblc condition there should be very little odor. "