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GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> AND ASSOC IATES INSPECTIONS & TESTING <br /> LABORATORY SERVICES <br /> POOL ENGINEERING <br /> POST TENSION DESIGN <br /> PART II: NITRATE LOADING STUDY. <br /> ARCH LUMBER <br /> 26955 SOUTH HANSEN ROAD <br /> TRACY, CALIFORNIA <br /> INTRODUCTION <br /> Our office was contracted by Mr. Dan Rhoades of Purcell,Rhoades &Associates, Inc. to conduct a <br /> Nitrate Loading Study (NLS) for the property at 26955 South Hansen Road,Tracy, California. <br /> Please refer to the relevant sections of the attached Soil Suitability Study (SSS) for introductory <br /> 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 /> 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 /> 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 and provides useful information to planners and <br /> local officials but with some real limitations. In their article published in Ground Water, Hantzsche <br /> v and Finnemore mention that "...the equation ignores dispersion,lateral flow, and mixing with <br /> r <br /> 2 <br /> `. LODI IN SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,California 95240 ■209.367.3701 ■ 209.369.4228 ■m .noandersonxnnn <br />