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F <br /> GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> A N © A 5 S O C I A T E S"004 I INSPECTIONS & TESTING <br /> LABORATORY SERVICES <br /> POOL ENGINEERING <br /> POST TENSION DESIGN <br /> March 28, 2007 <br /> NOA Project Number: E06122A <br /> Page 2 <br /> 1- _I <br /> PART II: NITRATE LOADING STUDY <br /> Fill SJC APPLICATION NUMBER: PA-06-3I3 (SA) <br /> 4065 & 4080 EAST CALLOWAY COURT <br /> -^ STOCKTON, CALIFORNIA <br /> �yF <br /> 1 <br /> INTRODUCTION <br /> Out office was contracted by Mike Smith Engineering to conduct a Nitrate Loading Study (NLS) for <br /> the property at 4065 and 4080 East Calloway Court, Stockton, California. Please refer to the <br /> relevant sections of the 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 /> F structure of the EHD's Nitrate Loading Study Requirements Checkust, dated July 14, 2003. <br /> Because of concern regarding nitrate leaching into ground water from septic systems, a nitrate <br /> F 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 /> F reach ground water. <br /> The method utilized for the nitrate loading analysis is based on a simple mass balance formula, <br /> F 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 /> F, <br /> ' F, 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 to estimate the potential impact to groundwater, <br /> ° F and provides useful information to planners and local officials but with some real limitations. In <br /> their article published in Ground Wlater, Hantzsche and Finnemore mention that "...the equation <br /> F <br /> 2 <br /> LODI ■ SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,California 95240 ■209.367.3701 ■ 209.369.4228 ■www.noar <br /> I <br />