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GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> 1 ' AND ASS OC IATES <br /> E INSPECTIONS x TESTING <br /> . 1 LABORATORY SERVICES <br /> i <br /> POOL ENGINEERING <br /> POST TENSION DESIGN <br /> December 12,2006 <br /> ri NOA Project Nurnber: E06094A . <br /> Page 2 <br /> NITRATE LOADING STUDY <br /> F1 <br /> S APPLICATION NUMBER: PA-06-470 (MS) <br /> 3548 COUNTRY CLUB BOULEVARD <br /> STOCKTON, CALIFORNIA <br /> f <br /> INTRODUCTION <br /> F�1� <br /> Our office was contracted by Dillon&Murphy Engineering of Lodi to conduct a Nitrate Loading <br /> Study (NLS) for the property at 3548 Country Club Boulevard, Stockton, California. <br /> F' <br /> To expedite San Joaquin,County Environmental Health Department EHD review, the <br /> formatting of this report has been designed to follow, to the ( ) <br /> g , greatest degree possible, the <br /> 71 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 /> R F 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 /> F <br /> The method utilized for the nitrate loading analysis is based on a simple mass balance formula, <br /> F <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 /> Ir. 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 Gmund Wlater, Hantzsche and Finnemore mention that "...the equation <br /> F.' <br /> 2 <br /> FJ LODI ■ SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,California 95240 11111111209.3673701 ■ 209.369.4228 ■www.noar .444 <br />