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f I <br />! GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> A N D A S S O C I A T E S <br /> j INSPECTIONS & TESTING <br /> LABORATORY SERVICES <br /> POOL ENGINEERING <br /> POST TENSION DESIGN <br /> �# January 16,2007 <br /> NOA Project Number: E07009A <br /> I , <br /> NITRATE LOADING STUDY <br /> 4391 ESCALON BELLOTA ROAD <br /> FARMINGTON, CALIFORNIA <br /> INTRODUCTION <br /> Our office was contracted by Dillon&Murphy Engineering of Lodi to conduct a Nitrate Loading <br /> Study (NLS) for the property at 4391 Escalon Bellota Road, Farmington,California. Please refer to <br /> the relevant sections of the Soil Suitability Study (SSS) done by Dillon&Murphy,job number <br /> 05127, dated September of 2006 for introductory project details. <br /> To expedite San Joaquin County Environmental Health Department (EHD) 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 systems, a nitrate <br /> loading analysis was required by the EHD for the proposed development to measure the potential <br /> concentration of percolating effluent and rain fall over the long term. Where percolating effluent <br /> L leaches into the ground,ground water quality may be impacted to some degree should the effluent <br /> reach ground water. <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 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 Finrnemore 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 Groand Water, 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 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 /> 1 1 <br /> 2 <br /> f LODI ■ SACRAMENTO ■ MODESTO <br /> I ENVIRONMENTAL DIVISION 902IndustrW Way,Lodi,Califomia 95240 ■209.367.3701 ■ 209.369.4228 ■www.noandersonxom <br /> � `F � <br />