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1 <br /> 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 /> LPOOL ENGINEERING <br /> POST TENSION DESIGN <br /> March 22, 2005 <br /> NOA Project Number: E040132A <br /> LPART II: NITRATE LOADING STUDY <br /> L GENERAL PLAN AMENDMENT PA-04-347 <br /> 8868 & 8998 E. MARIPOSA ROAD <br /> L STOCKTON, CALIFORNIA <br /> L INTRODUCTION <br /> Our office was contracted by Mr.Jaynes Pilkington of Stockton to conduct a Nitrate Loading Study <br /> L (NLS) for the proposed general plan amendment at 8868 and 8998 E. Mariposa Road, Stockton, <br /> California. Please refer to the relevant sections of the attached Soil Suitability Study (SSS) for <br /> introductory project details. <br /> rr. <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 StudyReguirements 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 /> 1` reach ground water. <br /> The method utilized for the nitrate loading analysis is based on a simple mass balance formula, <br /> I 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 /> L 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 /> I 2 <br /> ` LODI ■ SACRAMENTO ■ MODESTO <br /> - ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,Califomia 95240 ■209.367.3701 ■ 209.369.4228 ■w .nomdersonxc <br />