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Mencarini Property Page 9 of 14 <br /> Our Project Number: LG5080538 <br /> August 26, 2008 <br /> Thtl Hantzsche and Fennemore approach is "...a conservative (worst case) first approximation <br /> of groundwater 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 /> f of long-term effect (i.e., over years) on groundwater 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 /> n <br /> id 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 1.5. <br /> 4,Yf Mass Transport Soil Properties <br /> The percolation tests have revealed that the soils are fairly permeable. These soils will allow <br /> moderate infiltration of water through the surface soils. The longer the effluent remains near <br /> the surface, the more treatment is enhanced due to natural processes within the soil. If the <br /> permeable soils exist to the depth of the groundwater table, it is possible that surface <br /> contaminants may be transported fairly rapidly. <br /> X22 Groundwater Analysis <br /> 2.2.1 Regional Groundwater <br /> A discussion of regional groundwater, including depth to groundwater and directional <br /> groundwater gradient, is included in Section 1.4.1. No significant seasonal trends were evident <br /> from the maps consulted. <br /> 2.2.2 Potential Groundwater Contamination Issues <br /> A discussion of issues related to potential groundwater contamination is included in Section <br /> 1.4.2. <br /> 2.2.3 Current and Future On-Site Groundwater Uses <br /> There are currently two (2) wells on the site, an agricultural well and a domestic well, as noted <br /> in Section 1.4.3. Groundwater will be used on the site in the future. <br /> 902 industrial Way•Lodi,CA 95240•209.367.3701 •Fax 209.369.4228 02008 Neil O.Anderson&Associates.Inc <br />