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GEOTECHNICAL <br /> � NEIL O. ANDERSON ENVIRONMENTAL <br /> [ 't <br /> AN D ASSOCIATES <br /> INSPECTIONS a TESTING <br /> t LABORATORY SERVICES <br /> POOL ENGINEERING <br /> I POST TENSION DESIGN <br /> I <br /> January 16,2007 <br /> NOA Project Number: E07009A <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 Bellotti 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 /> Fk 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 /> FBecause 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 /> F, leaches into the ground,ground water quality may be impacted to some degree should the effluent <br /> reach ground water. <br /> FThe 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 /> local officials but with some real limitations. In their article published in Ground Wlater, 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 /> LODI ■ SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,California 95240 0 209.367.3701 N 209.369.4228 0 www.noanderson.com <br />