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C) t! <br /> F [ GEOTECHNICAL <br /> NEIL O. ANDERSON I ENVIRONMENTAL <br /> A N b A S 'SOC IAT E S INSPECTIONS & TESTING <br /> LABORATORY SERVICES <br /> POOL ENGINEERING <br /> POST TENSION DESIGN <br /> February 10, 2005 <br /> ! NOA Project Number: E05001A <br /> PART II: NITRATE LOADING STUDY <br /> SJC APPLICATION NUMBER PA-04-384 <br /> 18325 SOUTH AIRPORT WAY <br /> MANTECA, CALIFORNIA <br /> INTRODUCTION <br /> Our office was contracted by Mr. Christopher Withrow of Pkfoenix Progxam, Inc.�to conduct a k <br /> Nitrate Loading Study (NLS) for the property�at 13299 North Curry Avenue,Lodi, California:~'` <br /> Please refer to the relevant sections of the attached 5oi1 Suitability Study {SSS) for introductory <br /> 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 estimate the potential <br /> concentration of percolating effluent and rain fall. Where percolating effluent leaches into the <br /> ground, ground water quality may be impacted to some degree should the effluent reach ground <br /> 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 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 Dater, Hantzsche <br /> - and Finnemore mention that "...the equation ignores dispersion,lateral flow, and mining 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 ■209.367.3701 ■ 209.369.4228 ■www.noanderson.corn <br />