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Page 7 - •120 86-74 <br />tests be taken as the contr3lled fill is placed to document that proper com- <br />paction is being obtained. <br />NEW SEWAGE TREATMENT SYSTEM <br />Project Information <br />We undersand the new houseill have three bedrooms and approximately 4500 <br />square feet of living area. This implies it is a Type I residence. 1n <br />w <br />addition, there will be a half bath facility in the heated garage, which is <br />a separate structure. It is planned to place the soil treatment system in <br />the northwestern portion of the lot - <br />Percolation Test Results <br />the overall results of ouT- percolation (per(-) tests and borings indicate a <br />:uitdble pert rate but a shallow water table. A sheet describing the pert <br />test procedures, in accordance with WPC -40 Guidelines, is attached. <br />Comments and Recommendations <br />Because of the shallow water taole, which is only 31' below the surface in <br />the proposed drainfield area, we suggest that an "elevated drainfield" be <br />considered. Because of the several trees in the extreme northwest portion of <br />the lot, consideration should be qiven to shifting the drainfield eastward, <br />in the secondary area. Regardless of the exact location of tre new sewage <br />treatment system, the total trench bottom area can be based on a percolation <br />rate of 10 nin/in., in our opinion. For an estimated daily sewage flow of <br />