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[6] CONCLUSIONS Although each proposed parcel of the subject property has varying percolation rates for the shallow and deep test borings, it is recommended that a 12, 000 square foot leach field area be utilized for each of the four parcels. The shallow soil structure of the subject property, consisting of organic silty clays, is not conducive to favorable percolation of sewage effluent. Therefore, the maximum leaching area of 12 , 000 square feet should be designed. The sand strata encountered during the exploratory and percolation test borings is favorable for the percolation of effluent. Consequently, seepage pits must be utilized for each of the four parcels. There is to be a minimum of 40 feet of leach line between the septic tank and the pit, unless there is approval of deviation from the Environmental Health Department. The pit will have a minimum diameter of 33 inches and be installed to a maximum depth of 25 feet. As noted above, the water table is approximately 85 feet below grade. Therefore, the groundwater level in this area is unquestionably below the ten foot minimum distance between the bottom of the seepage pits (approximately 25 feet) and the highest anticipated depth to groundwater at this point in time. Additionally, there will be approximately 60 feet of soil between the bottom of the seepage pits and the current water table elevation. This distance through soil should be an adequate protection measure for the underlying groundwater from potential pollutants. Based upon the documented percolation information pertaining to the placement of the proposed seepage pits within a percable soil profile, and the highest anticipated depth to groundwater, there should not be any adverse impact to the quality of the local area - groundwater from these proposed septic systems. 6 -- O (�>uulilq � untrol 'rrs�ar'huri