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GEOTECHNICAL <br /> NEIL O. ANDERSON I ENVIRONMENTAL <br /> A N D A S S O C I A T E S INSPECTIONS a TESTING <br /> LABORATORY SERVICES <br /> POOL ENGINEERING <br /> POST TENSION <br /> DESIGN <br /> August 31, 2006 <br /> NOA Project Number: E06091A <br /> Page 2 <br /> Fi <br /> PART II: NITRATE LOADING STUDY <br /> JS C APPLICATION NUMBER: PA-06-020 <br /> _.. <br /> 11253 NORTH THORNTON ROAD <br /> STOCKTON, CALIFORNIA <br /> INTRODUCTION <br /> Our office was contracted by Mr. Sombun Atthitano of the Phrabuddhivongsamunee Buddhist <br /> Temple to conduct a Nitrate Loading Study (NLS) for the property at 11253 North Thornton Road, <br /> Stockton, California. Please refer to the relevant sections of the Soil Suitability Study (SSS) for <br /> introductory project details. <br /> To expedite San Joaquin County Environmental Health Department (EHD) review, the <br /> I 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 /> F1The 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 to estimate the potential impact to groundwater, <br /> and provides useful information to planners and local officials but with some real limitations. In <br /> their article published in Ground Water,Hantzsche and Finnemore mention that "...the equation <br /> { 2 <br /> F1LODI ■ SACRAMENTO ■ MODESTO "004 <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,IAdi,California 95240 0 209.367.3701 0 209.369.4228 ■www.noar. <br />