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L11%W � GEOTECHNICAL <br /> L NEIL O. ANDERSON ENVIRONMENTAL <br /> A N D A S 5 0 C I A T E S INSPECTIONS a TESTING <br /> LABORATORY SERVICES <br /> LPOOL ENGINEERING <br /> POST TENSION DESIGN <br /> L November 8, 2004 <br /> NOA Project Number: E040110A <br /> L PART II: REVISED NITRATE LOADING STUDY <br /> LMAJOR SUBDIVISION PA-04-2511/ <br /> 9422 EAST JAHANT ROAD <br /> L ACAMPO, CALIFORNIA <br /> L, INTRODUCTION <br /> Our office was contracted by Ms. Stacey Griffith of Acampo to conduct a Nitrate Loading Study <br /> L (NLS) for the proposed major subdivision at 9422 East Jahant Road,Acampo, California. Please <br /> refer to the relevant sections of the attached Soil Suitability Study (SSS) for introductory project <br /> 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 /> L 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 /> LHantzsche 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 /> and Finnemore mention that "...the equation ignores dispersion,lateral flow, and mixing with <br /> L <br /> 2 <br /> LODI ■ SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Indushial Way,Lodi,California 95240 ■209.367.3701 ■ 209.369.4228 ■w .noandersonxom <br /> L <br />