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LGEOTECHNICAL <br /> L NEIL O. ANDERSON ENVIRONMENTAL <br /> A N D A S S O C R T E S <br /> INSPECTIONS x TESTING <br /> LABORATORY SERVICES <br /> LPOOL ENGINEERING <br /> POST TENSION DESIGN <br /> L May 25,2006 <br /> NOA Project Number: E06040A <br /> LPART II: NITRATE LOADING STUDY <br /> N SJC APPLICATION NUMBER PA-5-708 (SA) <br /> 6. 3304 SOUTH STATE ROUTE 99 EAST FRONTAGE ROAD <br /> STOCKTON, CALIFORNIA <br /> L <br /> INTRODUCTION <br /> Our office was contracted by Mr.Jim Bird to conduct a Nitrate Loading Study (NIS) for the <br /> property at 3304 South State Route 99 East Frontage Road, Stockton, California. Please refer to the <br /> relevant 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 /> L Because of concern regarding nitrate leaching into ground water from septic systems,a nitrate <br /> g�� loading analysis was required by the EHD for the proposed development to measure the potential <br /> L 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 /> Lreach 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 /> L 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 /> Land Finnemore mention that"...the equation ignores dispersion,lateral flow, and mixing with <br /> I <br /> v <br /> 2 <br /> LLODI ■ SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,California 95240 ■209.367.3701 ■ 209.369.4228 ■w .noandmonxom <br /> L <br />