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TABLE 1 <br /> SOIL PROFILE CHARACTERISTICS AND <br /> ANALYTICAL TEST RESULTS <br /> SAMPLE DEPTHS SAND,SILT AND SOIL NITROGEN PH %ND <br /> LAB SAMPLE,IU CLAY PERCENTAGES SOIL CON FENT <br /> NT C:1rION F.xC1IAN(:E <br /> CLASSIFICATION oaGnrctc.wnlrfiR <br /> CONTENT CAPACITY <br /> One FI DcpthF35%,45%,20% <br /> 27%.34'1-s Clay Loam 53 Ppm NO,--N 7.5 19.4 mcq/IOOg <br /> LOFT 1.9% <br /> Two Ft Depth 45%,31%,24% Loam 102 ppm NO,--N 7.7 23.7 meq/100g <br /> 2.OFT 1.4% <br /> Three%:Ft Depth31%,34% Clay Loam 97 ppm NO-N 7.5 23.3 meq/100g <br /> 3.5FT 2.0% <br /> Five Ft Depth31°/y 20% Loam 46 ppm NO,-N 7.9 26.2 meq/1008 <br /> S.OFT 1.5% <br /> Five to Ten F[Deat39%,43%, 18% Loam 28 nom NO,-N 7.9 23.0 meq/1008 <br /> 510FT 1.1% <br /> Ten to Fifteen Ft Dep21%, 14% Sandy Loam 9 ppm NO-N 7.8 15.3 meq/100g <br /> 1015F Lo% <br /> Fifteen to Twenty Ft D5%,20% Loam 8 ppm NO,-N 7.7 14.6 meq/IOOg <br /> 1520F 0.9% <br /> Twenty to Twentv Fiv9%,24% Loam 6 ppm NQ-N 7.7 13.2 meq/100g <br /> Depths 0.6% <br /> 2025F <br /> As can be observed, the sand, silt and clay percentages, commonly referred to as particle size <br /> analysis or soil texture, vary moderately throughout the soil profile down to 25 ft, and are <br /> generally classified as a loam, or a silty material under engineering standards. Twenty-five ft is <br /> the maximum depth of a seepage pit septic system structure allowed by EHD, so the perc test <br /> boring was terminated at this depth. <br /> Percolation of water through soils occurs under both saturated and unsaturated flows. The rate of <br /> percolation is related to the hydraulic conductivity of the soil. When effluent from the project <br /> enters the soil-effluent interface, the soil will be wet from previous dispersal of effluent, so the <br /> water movement occurs mainly under saturated or semi-saturated flow in response to gravity. As <br /> effluent continues to flow downward, it is moving in response to the matric potential gradients as <br /> well as gravity and then enters unsaturated flow. This is the desired flow mechanism for sewage <br /> effluent. Factors will be incorporated into the design that promote unsaturated flow, such as equal <br /> distribution. <br /> Page 2 of 7 <br /> Chesney Consulting <br />