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«Project_Name» Page 8 <br /> Our Project Number: LGS080005 <br /> February 28,2008 <br /> The Hantzsche and Fennemore approach is "...a conservative (worst case) first approximation <br /> of ground-water nitrate-nitrogen concentration resulting from the combined effect of on-site <br /> sewage disposal systems and precipitation. This (the equation and approach) is for estimation <br /> of long-term effect (i.e., over years) on ground-water quality, and is not intended for prediction <br /> of seasonal 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. <br /> The formula, assumptions and calculations used for the analysis are shown on Plates 7 and 8. <br /> The units of nitrate used in the mass balance equation are nitrate-N, whose maximum drinking <br /> water contaminant level is 10 mg/L. <br /> 2.1 Chemical and Physical Properties of Soil <br /> 2.1.1 Chemical and Physical Soil Properties <br /> For a discussion of on-site soil properties, refer to Section I.5. <br /> 2.1.2 Mass Transport Soil Properties <br /> The percolation tests have revealed that the soils are moderately permeable. These soils will <br /> allow moderate to slow infiltration of water through the surface soils. The longer the effluent <br /> remains near the surface, the more treatment is enhanced due to natural processes within the <br /> soil. If the permeable soils exist to the depth of the ground water table, it is possible that <br /> surface contaminants may be transported fairly rapidly. <br /> 2.2 Ground Water Analysis <br /> 2.2.1 Regional Ground Water <br /> A discussion of regional ground water, including depth to ground water and directional ground <br /> water gradient, is included in Section I.4.1. No significant seasonal trends were evident from <br /> the maps consulted. <br /> 2.2.2 Potential Ground Water Contamination Issues <br /> A discussion of issues related to potential ground water contamination is included in Section <br /> I.4.2. <br /> 2.2.3 Current and Future On-Site Ground Water Uses <br /> There are currently no wells on the site, as noted in Section I.4.3. Ground water will be <br /> developed and used on the site in the future. <br /> ",44 <br /> 902 Industrial Way•Lodi,CA 95240.209.3673701 •Fax 209.369.4228 02008 Neil O.Anderson&Associates,Inc <br />