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r r, <br /> MINUTES May 2 , 1.992 5 BOARD OF HEALTH <br /> i <br /> Mr, McQuaid relayed we are concerned with the nitrate <br /> loading, and the virus and bacteria transport that result <br /> 1b from septic systems being close to a body of water. "This <br /> may address the nitrate loading but doesn't address the dis- <br /> tance that virus can travel which is well beyond a 1001 , 11 <br /> r. McGrath commented the lower ph is to accelerate the <br /> die-off of both badteria and viruses. "There is extensive <br /> research of viral ill--off but we would have to install <br /> larger leaching component or there must be more flow diffus- <br /> ers, " <br /> iff s- <br /> ers. " <br /> Mr, McQuaid questioned Mr. McGrath as to whether he <br /> would provide the Board with the particulars of the ex- <br /> perimental <br /> -eri ental system in Falmouth. <br /> Mr, McGrath responded, ,it is t a waterfront lot consisting <br /> of approximately 1 acre and is serviced by a well.. "The sys- <br /> tem was } l ed i n .a field 10 ' from the water. " "Soils are <br /> sandy and in 'outwash plain. " "."The design was different <br /> when installed, instead of mixing thewater with the .gray wa- <br /> ter we put in a separate rock filled chamber and the system <br /> wasn't acting right, " "Wa opened the-, system and found the <br /> rock was., f l l' of slim me. tl , "The slime had covered all the <br /> voids in the roc' k Player-; there was a bypass and the water was <br /> coming through the pipes so we removed the rocks. " "The re- <br /> sults are provided in the report. " "In reviewing the re- <br /> sults, there were times it was erratic and times we had highs <br /> and lows in nitrogen than predicted however-, the total report <br /> indicates alot of nitrogen removal." "l don't see why the <br /> chemical reactions with the nitrogen won't last forever," <br /> "The filter systems must be rebuilt every so* often. " "I don't <br /> ]snow how much absorption capacity is in the sand'. " <br /> Mr, McQuaid commented,, should this Board grant concep- <br /> tual <br /> on e - <br /> tual approval a testing protocol approved by . . , should be <br /> submitted, " <br /> Mr. McGrath stated yes however, the testing prolEocol <br /> used in Falmouth has flaws. <br /> Mr,. Mc uâ–ºaid questioned the length of time testing will <br /> tale place. <br /> Mr. McGrath responded, two years. <br /> Mr, McQuaid questioned, how lona the filter will remain <br /> active. <br /> L <br />