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LIVE OAK GEO ENVIRONMENTAL, INC. <br /> 407 W. Oak St., Lodi, CA 95240 :• (209)369-0375 4• logelodi.com <br /> March 21, 2016 <br /> Project Number: 1605 <br /> Frank Girardi <br /> San Joaquin County Environmental Health Department <br /> 1868 E. Hazelton Ave. <br /> Stockton, CA 95205 <br /> Regarding: Addendum to roil Suitability/Nitrate Loading Study <br /> Durst Winery <br /> PA-1600064 <br /> 10171 E. Acampo Rd., Acampo, CA <br /> Original report dated September 2, 2011 <br /> Mr. Girardi: <br /> To address the requirements of the San Joaquin County Environmental Health Department, we <br /> have prepared an addendum to the Nitrate Loading Study we completed for Durst Winery in <br /> 2011. Mr. Dan Durst of Durst Winery has indicated that he plans to increase the number of <br /> marketing events from four to 20 per year, and increase the number of estimated customers at <br /> each event from 40 to 100. Mr. Durst also indicated that the winery is now open seven days a <br /> week, serving, on average, less than 10 customers per day. Additional staff members are <br /> present Friday through Sunday, he stated. The aim of this addendum is to incorporate the new <br /> use numbers into the nitrate loading calculation. <br /> To assist the reader in following the calculation, we will present a new Nitrate Loading <br /> Calculation in its entirety. Changes from the original report are indicated in bold italics. <br /> NITRATE LOADING CALCULATION AND DISCUSSION <br /> Because of concerns of nitrate leaching into ground water from septic systems, a nitrate loading <br /> analysis was required by the San Joaquin County Environmental Health Department for <br /> approval of the proposed development. The study estimates the potential concentration of <br /> percolating effluent produced by the proposed project over the long term. Where percolating <br /> effluent leaches into the ground, ground water quality may be impacted to some degree should <br /> the effluent reach ground water. <br /> The method utilized for the nitrate loading analysis is based on a simple and convenient mass <br /> balance formula, discussed in a published article by Hantzsche and Finnemore (1992). <br /> Hantzsche and Finnemore have found from investigations conducted in the Chico, California <br /> area, the water quality in the upper saturated ground-water zone closely approximates the <br /> quality of percolating effluent from septic systems. They have developed a simple method that <br /> could be used to estimate the quality of the percolating effluent from septic systems. The <br /> quality of the percolating effluent may represent the potential worst-case condition the upper <br /> Environmental • Engineering Geology Geophysics <br />