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September 30, 2007 <br /> NOA Project Number: E07146A <br /> F! <br /> PART II: NITRATE LOADING STUDY <br /> j SJC APPLICATION NUMBER: PA-07-298 (SA) <br /> I! 7099 EAST PELTIER ROAD <br /> ACAMPO,CALIFORNIA <br /> [� J1.0 INTRODUCTION <br /> f Our office was contracted by Mr. Tim Holdenet of Macchia to conduct a Nitrate Loading Study <br /> F1j (NLS) for the property at 7099 East Peltier Road,Acampo, California. Please refer to the relevant <br /> 1 sections of the attached Soil Suitability Study (SSS) for introductory project details. <br /> � <br /> j To expedite San Joaquin County Environmental Health Department (EHD) review, the <br /> F I formatting of this report has been designed to follow, to the greatest degree possible,the <br /> structure of the EHD's Nitrate Loading Study Requirements Checklist, dated July 14, 2003. <br /> e � Because of concern regarding nitrate leaching into ground water from septic systems, a nitrate <br /> f loading analysis was required by the EHD for the proposed development to measure the potential <br /> FFconcentration of percolating effluent and rainfall over the long term. Where percolating effluent <br /> } leaches into the ground,ground water quality may be impacted to some degree should the effluent <br /> reach ground water. <br /> i <br /> I The method utilized for the nitrate loading analysis is based on a simple mass balance formula, <br /> discussed in a published article by Hantzsche and Finnemore (1992),which provides a convenient <br /> and simplified method to estimate long-term ground-water nitrate impacts on an area-wide basis. <br /> Hantzsche and Finnemore found that over a long period of time,water quality in the upper <br /> saturated ground-water zone closely approximates the quality of percolating recharge waters.They <br /> believe that their method is a good planning tool and provides useful information to planners and <br /> ilocal officials but with some teal limitations. In their article published in Gmund Water,Hantzsche <br /> j� and Finnemore mention that"...the equation ignores dispersion,lateral flow, and mixing with <br /> 1 I 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 /> { �I The Hantzsche and Fennemore approach is "...a conservative (worst case) fust approximation of <br /> [j 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 groundwaterquality,and is not intended for prediction of seasonal <br /> changes" (Hantzsche and Finnemore, 1992). <br /> 1 <br /> 1I1 <br />