Laserfiche WebLink
August 31, 2006 <br /> NOA Project Number: E06091A <br /> ignores dispersion, lateral flow, and nixing with ground water flow from up-gradient areas. These <br /> processes would generally contribute to additional reduction of nitrate-nitrogen concentrations in <br /> ground water to the extent that the nitrate-nitrogen concentration of ground-water flow from <br /> up-gradient areas is lower." <br /> The Hantzsche and Fennemore approach is "...a conservative (worst case) first approximation of <br /> ground-water nitrate-nitrogen concentration resulting from the combined effect of on-site sewage <br /> disposal systems and precipitation. This (the equation and approach) is for estimation of long-term <br /> effect(i.e., over years) on ground-water quality, and is not intended for prediction of seasonal <br /> F, changes" (Hantzsche and Finnemore, 1992). <br /> The method takes into account the development area, soil denitrification factor,rainfall volume, <br /> rainfall nitrate concentration,.waste effluent quantity,and waste effluent nitrate concentration. The <br /> formula, assumptions and calculations used for the analysis are shown on Plates 9 and 10. The units <br /> of nitrate used in the mass balance equation are nitrate-N,whose maximum drinking water <br /> F1contaminant level is 10 mg/L. <br /> 0 1.0 CHEMICAL AND PHYSICAL PROPERTIES OF SOIL <br /> 1.1 Chemical and Physical Soil Properties <br /> I} <br /> For a discussion of on-site soil properties,refer to Section 5 of the SSS. <br /> 1.2 Mass Transport Soil Properties <br /> The percolation tests have revealed that the soils are fairly permeable. These soils will allow <br /> moderate to rapid infiltration of water through the surface soils. if the sandy soils exist to the depth <br /> of the ground water table,it is possible that surface contaminates may be transported fairly rapidly. <br /> '-S 2.0 GROUND WATER ANALYSIS <br /> 2.1 Regional Ground Water <br /> F1A discussion of regional ground water is included in Section 4.1 of the SSS. r� <br /> 2.2 Potential Ground Water Contamination Issues <br /> A discussion of issues related to potential ground water contamination is included in Section 4.2 of z zJ <br /> the SSS. <br /> F1 <br /> 3 <br /> r <br />