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- <br /> 1 September 30, 2007 <br /> F] NOA Project Number: E07146A <br /> F_1 <br /> PART 11: NITRATE LOADING STUDY <br /> SJC APPLICATION NUMBER: PA-07-298 (SA) <br /> 7099 EAST PELTIER ROAD <br /> ACAMPO, CALIFORNIA <br /> l/1.0 INTRODUCTION <br /> Our office was contracted by Mr. Tim Holdener of Macchia to conduct a Nitrate Loading Study <br /> (NLS) for the property at 7099 East Peltier Road,Acampo, California. Please refer to the relevant <br /> _ sections of the attached Soil Suitability Study (SSS) for introductory project details. <br /> To expedite San Joaquin County Environmental Health Department (EI-ID) review, the <br /> 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 /> Because of concern regarding nitrate leaching into ground water from septic sstems, a nitrate <br /> loading analysis was required by the EHD for the proposed development to measure the potential <br /> concentration of percolating effluent and rainfall over the long term. Where percolating effluent <br /> F, <br /> leaches into the ground, ground water quality may be impacted to some degree should the effluent <br /> reach ground water. <br /> F!' <br /> 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 Fennemore (1992),which provides a convenient <br /> j and simplified method to estimate long-term ground-water nitrate impacts on an area-wide basis. <br /> J 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 /> local officials but with some real limitations. In their article published in Ground mater, Hantzsche <br /> and Finnemore mention that"...the equation ignores dispersion,lateral flow, and mixing with <br /> _ ground water flow from up-gradient areas. These processes would generally contribute to additional <br /> reduction of netxate-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 groundwaterquality, and is not intended for prediction of seasonal <br /> 0 changes" (Hantzsche and Fennemore, 1992). <br /> �� l <br /> FF <br />