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LIVE OAK GEO ENVIRONMENTAL, INC. <br />4000�_ 407 W. Oak St., Lodi, CA 95240 ❖ (209) 369-0375 •:• logelodi.com <br />October 14, 2021 <br />Project Number: 2145 <br />Francisco Garcia Ruiz, REHS <br />San Joaquin County Environmental Health Department <br />1868 E. Hazelton Ave. <br />Stockton, CA 95205 <br />Regarding: Addendum to Nitrate Loading Study (SR0084225) <br />Decker/Nickell Property <br />4569 E. Harvest Rd., Acampo, CA <br />Mr. Garcia Ruiz: <br />We spoke by telephone yesterday regarding the results of the nitrate loading calculation for the <br />above project. The calculation predicts that in a worst-case situation, the maximum buildup of <br />nitrates in the aquifer from the use of a septic system on the Site could be up to 12.9 mg/L-N. <br />The result of the nitrate loading estimate slightly exceeds the maximum drinking water <br />standard. <br />The septic contractor is proposing a shallow filter -bed septic system for the Site due to limited <br />space and setback requirements. Greater nitrate reduction is anticipated from this type of <br />system versus a standard (for the area) system with leach lines and seepage pits, due to the <br />increase in vadose zone of approximately 21.5 feet. <br />Although Live Oak cannot make engineering recommendations, we are aware that in the past <br />the San Joaquin County Environmental Health Department has allowed the use of an oversized <br />septic tank to mitigate nitrate impacts. If additional mitigation beyond the use of a shallow <br />system is desired for the Site, this option may be worth exploring. <br />Please feel free to contact us with any questions. <br />Sincerely, <br />Live Oak GeoEnvironmental, Inc. <br />CLOA. tk_ <br />David J. Welch, CEG, CHG, PGP <br />DJW:ar <br />CC: Keith Decker & Dondra Nickell <br />3358 E. Acampo Rd. <br />Acampo, CA 95220 <br />Environmental Engineering Geology Geophysics <br />