Laserfiche WebLink
SSS§ 5.2, NLS§ 1.1, 1.2. As the noted on the A&L Laboratory Soil Analysis Reports, chemical <br /> analyses of the two soil samples from the 36-inch depth and the nine-foot depths quantify several <br /> constituents that will influence nitrate loading from this project. The important parameters for <br /> nitrate loading assessment are the organic matter, pH, cation exchange capacity(CEC), clay content <br /> percentage, along with nitrate-nitrogen content. <br /> As noted, the nitrate-nitrogen content is a medium concentration and fairly consistent from three feet <br /> to nine feet in depth (18 ppm to 17 ppm). Organic matter in the soil is low in both soil samples. <br /> These two analyses suggests a medium potential for future nitrate-nitrogen loading from indigenous <br /> nitrogen soil content. It may also suggest a low denitrification potential since organic matter is <br /> needed for promotion of denitrification. Since septic effluent is composed predominately of <br /> ammonium (NH4), the pH, along with the CEC, are significant influences on ammonium molecules. <br /> The DH of the soil is alkaline w ich may inhibit ammonium formation and there stability, thus <br /> being detrimental to nitrification. The CEC measures the ability of the soil to theoretically trap and <br /> hold ammonium molecules. Cation Exchange Capacities of the soil samples are medium due to the <br /> clay and silt contents. This suggests there is a medium potential for the retention of ammonium <br /> molecules for microbial uptake, and suppression of nitrification. <br /> NLS§ 5.3 Table 1 below summarizes the subsurface soil characteristics encountered from the 36" <br /> and nine foot depths: <br /> TABLE 1 <br /> J <br /> SOIL PROFILE CHARACTERISTICS AND <br /> ANALYTICAL TEST RESULTS <br /> N <br /> CATION, SAND,SILT AND USDA SOIL SOIL NITROGEN pH AND <br /> PTH AND CLAY CLASSIFICATION CONTENT CATION EXCHANGE <br /> UMBER) PERCENTAGES CAPACITY <br /> ISPOSAL 55%,28%, 17% Sandy Loam 18 ppm NO,-N 8.2 13.3 meq/100g <br /> LD <br /> PTH <br /> ISPOSAL 67%, 22%, 11% Sandy Loam 17 ppm NO,-N 8.6 15.7 meq/100g <br /> LD <br /> EPTH <br /> C. PERCOLATION TEST RESULTS <br /> SSS§ 5.2, 6.2. To assess the permeability of the proposed leachfield area, percolation tests were <br /> conducted, as depicted on the Site Plan drawn by the Applicant Ms. Candace Worland, and found in <br /> Appendix C. The surface and subsurface soil investigation and testing began with hand-drilling a <br /> 36-inch perc test boring. A nine foot deep test boring was then completed 10 feet to the north. Soil <br /> samples were retrieved from each of these two depths for chemical and physical analyses,referenced <br /> above. <br /> 3 <br /> Chesney Consulting <br />