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i <br /> March 3, 2005 <br /> NOA Project Number: E040155A <br /> and Finnemore mention that "...the equation ignores dispersion, lateral flow, and mixing with <br /> ground water flow from up-gradient areas. These processes would generally contribute to additional <br /> reduction of nitrate-nitrogen concentrations in ground water to the extent that the nitrate-nitrogen <br /> concentration of ground-water flow from up-gradient areas is lower." <br /> F 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 /> changes" (Hantzsche and Finnemore, 1992). <br /> ri <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 /> F!! contaminant level is 10 mg/L. <br /> ]]] /u CHEMICAL AND PHYSICAL PROPERTIES OF SOIL <br /> l� 1.1 Chemical and Physical Soil Properties <br /> For a discussion of on-site soil properties,refer to Section 5 of the SSS. <br /> PJ 1.2 Mass Transport Soil Properties <br /> Fine grained sediments, such as the soils found on the Site, typically provide an added degree of <br /> protection between percolating effluent at the surface and ground water aquifers. Soils of this type <br /> do not typically present a high risk of excessive mass transport of nitrate or other constituents of <br /> F1concern. <br /> F / A--`2.0 GROUND WATER ANALYSIS <br /> E4 <br /> A,"' 2.1 Regional Ground Water <br /> i J A discussion of regional ground water,including depth to ground water and directional ground <br /> 1 water gradient,is included in Section 4.1 of the SSS. No significant seasonal trends were evident <br /> from the maps consulted. <br /> P! <br /> 3 <br /> l k <br />