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LGEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> L '-'04 A N D A S S O C I A T E S INSPECTIONS a TESTING <br /> LABORATORY SERVICES <br /> I POOL ENGINEERING <br /> L POST TENSION DESIGN <br /> April 14, 2006 <br /> NOA Project Number: E06038A <br /> L <br /> ! NITRATE LOADING STUDY UPDATE <br /> L <br /> VINO PIAZZA <br /> ` 12470 EAST LOCKE ROAD <br /> LOCKEFORD, CALIFORNIA <br /> ` SJC APPLICATION NUMBER: PA-05-744 (SA) <br /> L <br /> INTRODUCTION <br /> L <br /> Our office was contracted by Don Litchfield of Copperford,LLC to conduct a Nitrate Loading <br /> Study Update for the property at 12470 East Locke Road,Lockeford, California. We previously <br /> IL completed a Soil Suitability/Nitrate Loading Study ("original studn for Mr. Litchfield on July 17, <br /> 2002;please refer to the relevant sections of that study for introductory project details. This report <br /> is intended to update the original study to reflect current conditions. <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 /> L LODI ■ SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,Califomia 95240 ■209.367.3701 ■ 209.369.4228 ■w .noandmmxom <br /> L <br />