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L _ <br /> '.. GEOTECHNICAL <br /> L NEIL O. ANDERSON ENVIRONMENTAL <br /> A N D A S S O C A T E S INSPECTIONS a TESTING <br /> '., LABORATORY SERVICES <br /> LPOOL ENGINEERING <br /> POST TENSION DESIGN <br /> L March 25, 2005 <br /> NOA Project Number. E05005A <br /> L PART II: NITRATE LOADING STUDY <br /> LSJC APPLICATION NUMBER PA-04-519 <br /> 8372 SOUTH JACK TONE ROAD <br /> L STOCKTON, CALIFORNIA <br /> L INTRODUCTION <br /> L Our office was contracted by Mr.Jim Clare of Pacific Southwest Irrigation Corporation to conduct a <br /> Nitrate Loading Study (NLS) for the property at 8372 South Jack Tone Road, Stockton, California. <br /> Please refer to the relevant sections of the attached Soil Suitability Study (SSS) for introductory <br /> f project details. <br /> L 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 /> 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 /> Ldiscussed 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 /> Llocal officials but with some real limitations. In their article published in Ground Water,Hantzsche <br /> and Finnemore mention that"...the equation ignores dispersion, lateral flow, and mixing with <br /> L <br /> 2 <br /> L <br /> LODI IN SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,California 95240 ■209.367.3701 ■ 209.369.4228 ■w .noandersonxotn <br /> L <br />