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d <br /> LIVE OAK GEO ENVIRONMENTAL, INC. <br /> 407 W. Oak St., Lodi, CA 95240 •:• (209)369-0375 •:• logelodi.com <br /> March 6, 2019 <br /> Project Number: 1847 RICEM0 <br /> Michael Kith, Lead REHS MAR '06 <br /> San Joaquin County Environmental Health Department <br /> 1868 E. Hazelton Ave. IMIRONMENTAt r rq <br /> Stockton, CA 95205 DEPNtTAAf!►r <br /> Regarding: Addendum to Soil Suitability/Nitrate Loading Study <br /> Jhamat Property <br /> 5310 Las Positas Cir., Stockton, CA <br /> Mr. Kith: <br /> In response to your request on February 27, we have prepared this addendum to the <br /> above Soil Suitability/Nitrate Loading Study. This letter represents our latest <br /> understanding of the percolating recharge water input to the nitrate loading calculation, <br /> including a discussion of evapotranspiration versus precipitation. <br /> The revised nitrate loading discussion 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 <br /> Department for approval of the proposed project. The study estimates the potential <br /> concentration of percolating effluent produced by the proposed project over the long <br /> term. Where percolating effluent leaches into the ground, ground water quality may be <br /> impacted to some degree should the effluent reach ground water. <br /> The method utilized for the nitrate loading analysis is based on a simple and convenient <br /> mass balance formula, discussed in a published paper by Hantzsche and Finnemore <br /> (1992). <br /> Hantzsche and Finnemore have found from investigations conducted in the Chico, <br /> California area, the water quality in the upper saturated ground-water zone closely <br /> approximates the quality of percolating effluent from high-density septic systems. They <br /> have developed a simple method that could be used to estimate the quality of the <br /> percolating effluent from septic systems. The quality of the percolating effluent may <br /> represent the potential worst-case condition the upper aquifer would ever experience <br /> from the use of on-site septic systems. Mixing and dilution in the aquifer as well as <br /> adsorption and adhesion in the soil would tend to substantially reduce the concentration <br /> of percolating effluent. <br /> Environmental Engineering Geology Geophysics <br />