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' ■■vi: <br />d: <br />EXHlSiT <br />TO: <br />FRONt <br />Jeanne A. Mabusth, Zoning Administrator <br />Michael P. Gaffron, Septic System Inspector <br />DATBt May 29, 1982 <br />SUBJECTt #677 Gregory/Duff - Proposed Subdivision “ Septic Review <br />I have reviewed the site evaluation report by Mark Gronberg <br />dated May 18, 1982, and wish to make the following comments: <br />Lot 1 “ Additional testing was done in the area east of the <br />existing foundation «diere better soils were encountered in the <br />previous testing* A satisfactory site for a standard (preferably <br />shallow) trench system exists with average perc rate 45± a^i <br />and slopes of 5 to 15%. Also, additional testing on flat <br />(3% ^ slope) ground to the immediate south of the foundation <br />encountered a high seasonal water table soil, that appears to <br />have been scrai^ of topsoil. I concur with Gronbergs recomm <br />that additional sandy loam topsoil be brought in and allowed <br />to settle in order to make this site more acceptable for a future <br />mound. <br />ndation <br />Note that testing northwest of the foundation indicated poor <br />perc rates and slopes of about 15%, hence unsuited for septic <br />systesui. The areas tested east and south of the foundation appear <br />to be the only sites suited for drainfield on the lot; other <br />locations appear too steep, too wet, or have poor perc rates. <br />Care must be taken when locating a house that the acceptable <br />drainfield sites are preserved. A pump will likely be required <br />in the septic system since drainfield sites are at the high <br />point of the lot. <br />Lot 2 - Drainfield sites previously tested were acceptable, <br />as long as house location does not encroach upon drainfields. <br />Lot 3 ~ Has an existing house with an existing functional <br />drainfield within 75* of the lake. Testing on this lot was <br />for an alternate site. Testing in December encountered very <br />poor perc rates on slopes of 15-20%, which was unacceptable. <br />Testing further eastward in Nay found a site with better <br />perc rates and not as steep, average perc rate ^5 mpi, <br />slope about 3% in the tested area on a minor terrace. Gronberg <br />indicates that some sandy loam fill %rould make this site more <br />suitable for a mound system, and I would add that it should be <br />placed on the most level ground within the tested area. Because <br />of the steeper slopes uphill from the mound site, some diversionary <br />drainage measures would need to be taken once the mound is <br />constructed.