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TO: Jeanne A. Mubusth, Zoning Administrator <br />FROH: Michael P. Gaffron, Septic System Inspector <br />DATE: May 4, 1981 <br />SUBJECT: Septic Testing, McCleary Property, 3445 Bayside Road <br />#589 <br />I have reviewed the site evaluation report submitted by <br />Carl Borg on behalf of Mr. McCleary, and wish to make <br />the following comments: <br />1. Testing was done the beginning of April. In nearly <br />all. holes the water table vas round to be at a depth <br />of 1.0-1.8 feet below the surface. This coupled with <br />my bori:.•js in December 1979 indicate that the water - <br />table fluctuates, but is probablv at least 1 foot <br />below the surface dur_ng most of the year in the areas <br />tested. (which are the highest portions of the property) <br />2. Percolation tests were taken at a depth of 15", and <br />where water table was below the hole an average percolation <br />rate of 17 minutes per inch was found. The black silty <br />organic clays of the site are underlain by seams of <br />sand and gray silty clay. <br />3. Cased on the above findings, it seems that the major <br />limiting site factor is the water table, which nor -ally <br />for a mound system would have to be at least 2 to 3 <br />feet below the surface as a minimum. The design <br />proposed by the applicants site evaluator includes <br />adding a layer of fill from the site over the natural <br />surface to increase the depth to water table to 2 feet <br />or more. This appears to be the best method as long <br />as A) the material used for fill is essentially the <br />same organic silty clay as that on the drainfield <br />site; and B) the fill material and existing soil are <br />Plowed or scarified to minimize any layering effect <br />that could occur, which might create a permeability <br />boundary and cause lateral seepage. <br />4. The proposal incorporates . separate rockbed for each <br />house within a single sand mound/berm. This method <br />will allow for separation of each residence's effluent <br />and will help to determine liability should system <br />failure ever occur. <br />S. The existing well/hand pump system should be properly <br />filled and sealed prior to any construction on the <br />site. <br />