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TO: Jeanne A. Mubusth, Zoning Administrator <br />FROM: Michael P. Gaffron, Septic System Inspector <br />DATE: May 4, 1981 <br />SUBJECT: Septic Testing, McCleary Property, 3445 B3yside Road <br />0589 <br />I have reviewed the site evaluation report submitted by <br />CzArl Borg on behalf of Mr. McCleary, and wish to cake <br />the following comments: <br />1. Testing was done the beginning of April. In nearly <br />all holes the water table was found to be at a depth <br />of 1.0-1.8 feet below the surface. This coupled with <br />my borings in December 1979 indicate thit the water - <br />table fluctuates, but is probably at least 1 foot <br />below the surface during 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 Leiow 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. Based on the above firings, it seems that the major <br />limiting site factor is the water table, which normally <br />f(,r a mjund system would have to be at least 2 to 3 <br />feet below tLe surface as a minimum. Th(i design <br />proposed by the ipplicant's site evaluator includes <br />adding a layer of till 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 />siter and B) the fill material and existing soil are <br />Plowed or scarified to minimize any layering effect <br />that could occur, which might crAate a permeability <br />boundary and cause lateral seepage. <br />4. The proposal incorporates a separate rockbed for each <br />house within a single sand mound/berm. This method <br />will Lllow for separation of each residence'n effluent <br />and will help to determine liability should system <br />failure ever occur. <br />5. The existing well/hand pump system should be properly <br />filled and sealed prior to any construction on the <br />site. <br />