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October 19, 1983 �ob # 1980 <br /> Joe Backes Page 2 of 2 <br /> RECOMI�NDATIONS: It is our recommendation that the site is suitable for <br /> dn onsite sewage disposal system. YJe reco.�nmend that the system be installed <br /> according to the attached specifications. These specifications are based <br /> on a design using innovative materials for the drainfield. <br /> The innovative drainfield material recorrunended is SB2 manufactured by ADS <br /> _ (advanced Drainage Systems, Inc). The material consists of a large <br /> diameter (10 inch) corrugated plastic pipe with two rows of drain holes <br /> spaced 120 degrees apart. This material is wrapped with a filter fabric <br /> designed to filter out infil�;ration of soil particles into the tube, but <br /> to allow water to pass from the tubing drain holes into the soil. It <br /> is used in lieu of rock and smaller dismeter distribution pipes. The <br /> material was developed in Texas and has been used extensively there <br /> where rock was in short supply� and has been used in some pilot installations <br /> under the scrutir�y of U of M agricultural extension service in Minnesota, <br /> A primary benefit on this particular site is that it would not require <br /> transporting rock to the relatively inacessable island site with construction <br /> located some 20 feet hi�er than the lake level. <br /> Since SB2 tubing is an innovative material, the City of Orono has no <br /> design standards for its use. The manufacturets technical literature <br /> suggests that one foot of SB2 tubing would provide the same drain field <br /> capacity as 3 square feet of conventional drain �ield using rock and <br /> smaller diameter distribution pipes. Accordi.ng to information you have <br /> provided, the proposed construction for the site would be a seasonal <br /> cabin falling under the type III c�tagory according to the MPCA onsite <br /> sewage treatment standards. The structure would have 3 bedrooms. Using <br /> tl-ie largest percolation rate of 21� r,u.nutes per inch, MPCA requirements <br /> for this type structure occupied year round would call for 36I� square feet <br /> of standard drain field. On this basis, we recommend installing a total <br /> of 120 lineal feet of SB2 drain tubing for the drain field. <br /> Very trul,y yours, <br /> TO?4 SrffTH ASSOCIF�TES, INC I h�reby ee-��ry tha� tn;s plan, s^ec;'�cat�.n, or <br /> 1'eporiwasprepared�y ms pr un;��r ;hy �ir�„-t <br /> ei'�%� sup�rvs�cn and i;iai 1 an a d::iy Ra,�s;�r�� <br /> B Pr�;�ssic�ei F^ci::car C:.::c: t:tc L�:vS of tnp <br /> Txor�s x sr��, PE st�,�Gf Minr.�so a <br /> encl Logs of soil borin�s �������� <br /> Percolation test data sheets T��:,'�`5 �`. `",'i�{ <br /> Site evaluation location plan �ate ��—��—�--� Rts• No. 4044 <br /> Speci.f ications <br /> TOM SMITH ASSOCIATES inc <br />