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L "" GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> LA N D A S S O C I A T E S INSPECTIONS a TESTING <br /> LABORATORY SERVICES <br /> LPOOL ENGINEERING <br /> POST TENSION DESIGN <br /> May 25,2006 <br /> NOA Project Number: E06015A <br /> Page 2 <br /> L <br /> PART II: NITRATE LOADING STUDY <br /> L SJC APPLICATION NUMBER UNASSIGNED <br /> L4015 NEWTON ROAD <br /> STOCKTON, CALIFORNIA <br /> L <br /> INTRODUCTION <br /> L, Our office was contracted by Mr.Ted Green of Santa Rosa to conduct a Nitrate Loading Study <br /> (NLS) for the property at 4015 Newton Road, Stockton, California. Please refer to the relevant <br /> ` sections of the Soil Suitability Study (SSS) prepared by NOA and dated April 24,2006 for <br /> L introductory 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 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 /> L, 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 /> Land 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 /> L 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 /> Ltheir article published in Ground Water, Hantzsche and Finnemore mention that "...the equation <br /> 2 <br /> LODI ■ SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,California 95240 ■209.367.3701 ■ 209.369.4228 ■w .nwr <br /> L <br />