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� <br /> ,-�,,.-�� �Cv <br /> �� �� � � <br /> � r� � � � . <br /> � <br /> TO: Jeanne A. Mabusth, Zoning Administrator <br /> Dick Benson, City Administrator <br /> Glenn Cook, City Engineer <br /> Tom Jacobs, Building Official <br /> City Council <br /> Planning Commission <br /> FROM: Michael P. Gaffron, Septic Systems Inspector <br /> DATE: November 4 , 1983 <br /> SUBJECT: Drainfield System using gravel-less trenches - proposed for <br /> experimental installation in Crono <br /> I have been approached by Mr. Joseph Backes regarding construction of a <br /> single-family seasonal cabin with indoor plumbing proposed to be built <br /> on his Big Island property, Record Lot #46 , which is a buildable si�e as <br /> per Resolution #1544 . Mr. Backes has proposed to install an innovative <br /> drainfield system using a product known as "SB-2" drainfield tubing, which <br /> does not require the use of gravel or rock. The purpose of this memo is <br /> to make you aware of this product and to propose some guidelines as <br /> to its experimental use in Orono. (Mr. Backes has already had a site <br /> evaluation performed, and his site has suitable soils and proper setback <br /> distances for an on-site system to function adequately for a seasonal <br /> dwelling. ) <br /> "SB-2" consists of an 8" or 10" diameter corrugated plastic tubing <br /> surrounded by a nylon mesh fabric , typically sold in 20 ' sections. This <br /> tubing is buried in natural soil following the same setback andlocation <br /> requirements as a standard trench drainfield system, but with no rock <br /> surrounding the pipe. The theory is that with the mesh bridging the <br /> corrugations and forming a soil-mesh interface contact area, effluent <br /> will flow through the holes in the pipe into the corrugations and seep <br /> through the mesh into the surrounding soil, eventually forming a biomat <br /> similar to that found in rock-filled trench�s. The tubing is light weight <br /> and easier to handle than rock, and actually originated out of a need to <br /> find an alternative to rock filled trenches in areas of the country where <br /> rock is not readily available. This tubing would appear to be well suited <br /> for use on Big Island because it can be easily transported. <br />