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September 30, 2007 <br /> PF, <br /> NOA Project Number: E07141A <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 /> 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 /> Fitchanges" (Hantzsche and Finnemore, 1992). <br /> he method takes into account the development area, soil denitrification factor, rainfall volume, <br /> rainfall nitrate concentration,waste effluent quantity, and waste effluent mr-at ce oncentr-ati The <br /> formula, assumptions and calculations used for the analysis are shown o /Plates 5 fl io h 7. 1he <br /> units of nitrate used in the mass balance equation are nitrate-N,whose m3uinking water <br /> contaminant level is 10 mg/L. <br /> F! 1.0 CHEMICAL AND PHYSICAL PROPERTIES OF SOIL <br /> 1 1.1 Chemical and Physical Soil Properties <br /> For a discussion of on-site soil properties,refer t6 Section 5 of the S <br /> ' 1.2 Mass Transport Soil Properties <br /> The percolation tests have revealed that the soils are highly 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 /> F-11 <br /> of the ground water table,it is possible that surface contaminates may be transported fairly rapidly. <br /> 2.0 GROUND WATER ANALYSIS <br /> P 2.1 Regional Ground Water <br /> A discussion of regional ground water is included in`Secti 4�e S. <br /> 2.2 Potential Ground Water Contamination Issues �� <br /> F! A discussion of issues related to potential ground water contamination is included in eco tri �o .2 0 <br /> the SSS. <br /> Fji 2.3 Current and Future On-Site Ground Water Uses <br /> There is currently one well on site which has been used by the .-rte _o_dusdag-facilfty. The use of <br /> oundwater is proposed for all parcels. <br /> 3 <br /> Fi <br />