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GEOTECHNICAL <br /> NEIL O. ANDERSON I:NV1ROh MENTAL <br /> A IN D A S S O C I A T E S INSPECTIONS & TESTING <br /> LABORATORY SERVICES <br /> rip POOL ENGINEERING <br /> POST TENSION DESIGN <br /> May 17, 2007 <br /> F NOA Project Number: E07064A <br /> Page 2 <br /> F1 <br /> PART II: NITRATE LOADING STUDY <br /> SJC APPLICATION NUMBER: PA-05-1.43 <br /> 10464 NORTH STATE ROUTE 99 EAST FRONTAGE ROAD <br /> STOCKTON, CALIFORNIA <br /> F ` <br /> INTRODUCTION <br /> F_ Our office was contracted by Dillon and Murphy Consulting Civil Engineers of Lodi, California to <br /> conduct a Nitrate Loading Study (NLS) for the property at 10464 North State Route 99, East <br /> Frontage Road, Stockton, California. Please refer to the relevant sections of the Soil Suitability <br /> r Study (SSS) prepared by Dillon&Murphy for the subject property for introductory project details. <br /> To expedite San Joaquin County Environmental Health Department(EHD) review, the <br /> P 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 /> F1 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 /> F1and 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 /> F1 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 /> F, their article published in Ground Water,Hantzsche and Finnemore mention that "...the equation <br /> f 2 <br /> LODI ■ SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,California 95240 ■209.367.3701 0 209.369.4228 ■www.noar. <br />