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Ir GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> AND ASSOC IATES <br /> ir INSPECTIONS 8 TESTING <br /> I <br /> LABORATORY SERVICES <br /> POOL ENGINEERING <br /> bm POST TENSION DESIGN <br /> April 7, 2006 <br /> 6W NOA Project Number: E06020A <br /> and Finnemore mention that "...the equation ignores'dispersion,�ateral 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 /> 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 /> 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 through 12. The <br /> units of nitrate used in the mass balance equation are nitrate-N,whose maximum drinking water <br /> contaminant level is 10 mg/L. <br /> 1.0 CHEMICAL AND PHYSICAL PROPERTIES OF SOIL <br /> 1.1 Chemical and Physical Soil Properties <br /> For a discussion of on-site soil properties,refer to Section 5 of the SSS.-- <br /> 1.2 Mass Transport Soil Properties <br /> The percolation tests have revealed that the soils ale moderate y rmeable. These soils will allow <br /> moderate infiltration of water through the surface sow-Leered soils and sediments, such as the <br /> some fine-grained soil layers found on the Site, typically provide a degree of protection between <br /> percolating effluent at the surface and shallow ground water aquifers. Soils of this type do not <br /> typically present a high risk of excessive mass transport of nitrate or other constituents of concern. <br /> 2.0 GROUND WATER ANALYSIS <br /> 2.1 Regional Ground Water <br /> b. A discussion of regional ground water is included in Section 4.1 of the SSS. <br /> 3 <br /> LODI ■ SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,(:alifornia 95240 ■209.367.3701 ■ 209.369.4228 ■www.noar <br /> L <br />