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r. ‘pisfe: <br />Zoning File #1619 <br />February 14, 1991 <br />Page 6 <br />'4 <br />V# <br />Further^ 3 of the 8 proposed mound sitesare located less <br />than the Orono Code requirement of 75' from a wetland area. <br />However, there are no State setback requirement! from wetlands to <br />septic systems except if those wetlands are ftrt of a "public <br />water". None of the wetlands in question meet tiis category. The <br />State requirements would merely require that soil and water table <br />conditions be appropriate for a given design of septic system at <br />a given site. <br />Orono has generally attempted to maintain i 75' setback from <br />wetlands to limit nutrient inflow to the wetlail as well as keep <br />the drainfield system far enough from the wetland to eliminate <br />any wetland effects on that system. In the ca* of proposed Lot <br />2, a drainfield site with the southerly mound loe being 35' from <br />the 0.3 acre pond, the drainfield site is ajaroximately 3-4' <br />higher than the probable overflow elevation of the pond, hence <br />flooding of the drainfield site would not a problem. It is <br />unlikely that the pond would have a signifirnact on raising <br />the groundwater table to an elevation where- it would <br />detrimentally affect the mound system. <br />The other question is whether the mound will affect the <br />pond. There is the possibility of nutrients from the septic <br />system flowing through the ground and entering fte pond. However <br />the pond is probably nutrient rich already iue to inflow of <br />natural nutrients, and the added nutrients from the septic system <br />would likely have an insignificant effect looilized within the <br />pond itself. From that standpoint, the location of drainfield <br />sites less than the 75' setback from wetlandson this property <br />should have no real public health, safety or welfare impact. <br />However, they may be a nuisance for homeownersin attempting to <br />keep the pond free of vegetation. <br />Soil testing on the property indicated Shat each of the <br />proposed drainfield sites would need a mound syaion rather than a <br />trench system due to high seasonal water titoles. The site <br />evaluator notes that soil borings were made evm on some of the <br />sloped areas to determine whether trench qfstems would be <br />feasible, however, soil conditions dictated thit mounds be used. <br />The following is a review of the septic sites f*" each lot;