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GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> A ry D A S S O C R T E S <br /> INSPECTIONS & TESTING <br /> LABORATORY SERVICES <br /> POOL ENGINEERING <br /> POST TENSION DESIGN <br /> NITRATE LOADING STUDY <br /> FARMINGTON MURPHY PROPERTY <br /> 2852 S. JACKTONE ROAD <br /> STOCKTON, CALIFORNIA <br /> OUR PROJECT NUMBER: E07213A <br /> INTRODUCTION <br /> Our office was contracted by Mr. Chester Murphy of The Murphy Companies to conduct a <br /> Nitrate Loading Study (NLS) for the property at 2852 S. Jacktone Road, Stockton, California. <br /> We understand that the project involves a rezone from agriculture to commercial through the <br /> San Joaquin County Community Development office. The San Joaquin County application <br /> number is PA-0600524. We understand a Soil Suitability Study (SSS) was prepared by Dillion <br /> and Murphy Engineers, Lodi, California, dated December 2006, Project no. 0498; please refer to <br /> that report for project details as specified. <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 <br /> potential concentration of percolating effluent and rain fall over the long term. Where <br /> percolating effluent leaches into the ground, ground water quality may be impacted to some <br /> degree should the effluent reach ground water. <br /> 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 <br /> convenient and simplified method to estimate long-term ground-water nitrate impacts on an <br /> 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. <br /> They believe that their method is a good planning tool and provides useful information to <br /> planners and local officials but with some real limitations. In their article published in Ground <br /> Water, Hantzsche and Finnemore mention that "...the equation ignores dispersion, lateral flow, <br /> and mixing with ground water flow from up-gradient areas. These processes would generally <br /> contribute to additional reduction of nitrate-nitrogen concentrations in ground water to the <br /> extent that the nitrate-nitrogen concentration of ground-water flow from up-gradient areas is <br /> lower." <br /> ANGELS CAMP • LODI • MODESTO • RENO • SACRAMENTO • WALNUT CREEK <br /> L 0 D 1 902 Industrial Way • Lodi,CA 95240 • 209.367.3701 • FAX 209-369-4228 • www.noanderson.com <br />