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contribute to additional reduction of nitrate-nitrogen concentrations in ground water to the extent that the nitrate-nitrogen concentration of ground-water flow from up-gradient areas is lower." The Hantzsche and Fennemore approach is "...a conservative (worst case) first approximation of ground-water nitrate-nitrogen concentration resulting from the combined effect of on-site sewage disposal systems and precipitation. This (the equation and approach) is for estimation of long-term effect (i.e., over years) on ground-water quality, and is not intended for prediction of seasonal changes" (Hantzsche and Finnemore, 1992). The method takes into account the development area, soil denitrification factor, rainfall volume, rainfall nitrate concentration, waste effluent quantity, and waste effluent nitrate concentration. The formula, assumptions and calculations used for the analysis are shown on Plates 7 and 8. 'ton The units of nitrate used in the mass balance equation are nitrate-N, whose maximum drinking water contaminant level is 14 mg/L. 2.1 Chemical and Physical Properties of Soil 2.1.1 Chemical and Physical Soil Properties For a discussion of on-site soil properties, refer to Section I.5. 2.1.2 Mass Transport Soil Properties The percolation test has revealed that the soils are fairly permeable. These soils will allow moderate to rapid infiltration of water through the surface soils. The longer the effluent remains near the surface, the more treatment is enhanced due to natural processes within the soil. If the permeable soils exist to the depth of the ground water table, it is possible that surface contaminants may be transported fairly rapidly. 2.2 Ground Water Analysis 2.2.1 Regional Ground Water i� A discussion of regional ground water, including depth to ground water and directional ground water gradient, is included in Section I.4.1. No significant seasonal trends were evident from the maps consulted. 2.2.2 Potential Ground Water Contamination Issues A discussion of issues related to potential ground water contamination is included in Section I.4.2. 2.2.3 Current and Future On-Site Ground Water Uses There is currently one well on site, as noted in Section I.4.3. The well will serve the residences on site as well as the banquet hall and tasting rooms. -44 902 Industrial Way•Lodi,CA 95240•209.367.3701 •Fax 209.369.4228 02008 Neil O.Anderson&Associates,Inc