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LIVE OAK GEO ENVIRONMENTAL, INC. <br /> 407 W. Oak St., Lodi, CA 95240 •> (209)369-0375 ❖ logelodi.com <br /> July 18, 2017 <br /> Project Number: 1714 RECEIVED <br /> Rodney Estrada, REHS JUL � ) 2U1� <br /> San Joaquin County Environmental Health Department <br /> 1868 E. Hazelton Ave. ENVIRONMENTAL HEALM <br /> Stockton, CA 95205 PERMIT/SERInCES <br /> Regarding: Addendum to Soil Suitability/Nitrate Loading Study <br /> Delicato Family Vineyards <br /> 12001 & 12165 S. St. Rt. 99 W. Frontage Rd., Manteca, CA <br /> PA-1700032 (UP) <br /> Original Report dated May 25, 2017 <br /> Mr. Estrada: <br /> We spoke by phone the other day, at which time you requested that we modify the nitrate <br /> loading calculation discussed in the above report. Specifically, you indicated that the <br /> Environmental Health Department would prefer the nitrate loading calculation only to include <br /> parcels on which portions of the existing/proposed facility will be located; parcels containing only <br /> single-family homes and other non-related structures should be excluded from the analysis, <br /> regardless of ownership. <br /> The nitrate loading section of the report has been revised as follows: <br /> NITRATE LOADING STUDY <br /> Because of concerns of nitrate leaching into ground water from septic systems, a nitrate <br /> loading analysis was required by the San Joaquin County Environmental Health Department for <br /> approval of the proposed construction. The study estimates the potential concentration of <br /> percolating effluent produced by the proposed project over the longterm. 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 /> aquifer would ever experience from the use of on-site septic systems. Mixing and dilution in <br /> the aquifer as well as adsorption and adhesion in the soil would tend to substantially reduce <br /> the concentration of percolating effluent. <br /> Environmental ❖ Engineering Geology ❖ Geophysics <br />