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GEOTECWNCCAL <br /> ! Lb. ANDERSON <br /> ENVIRONMENTAL <br /> AN D ASSOCIATES <br /> INSPECTIONS-& TESTING <br /> LABORATORY :SERVICES . <br /> I <br /> POOL ENGINEERING <br /> POST TENSION DESIGN <br /> November 19, 2004 <br /> NOA Project Number: E040107A <br /> PART II: NITRATE LOADING STUDY <br /> PERMIT APPLICATION NUMBER: PA-03-487 <br /> 3737 WEST ELEVENTH STREET <br /> TRACY, CALIFORNIA <br /> INTRODUCTION <br /> Our office was contracted by Mr.Vern Vierra to conduct a Nitrate Loading Study (NLS) for the <br /> proposed lot line adjustment at 3737 West 11ffi Street, California. Please refer to the relevant <br /> sections of the attached Soil Suitability Study (SSS) for 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 /> 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 watets.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 nixing with <br /> LODI ■ SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,California 95240 ■209.367.3701 0 209.369.4228 ■www.noanderson.com <br />