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QUI/y <br /> cc SQ N OQQ N Environmental Health Department <br /> COUNTY <br /> Jasjit Kang, REHS, Director <br /> cP <br /> ,kjl oar's Greatness grows here. Muniappa Naidu,REHS,Assistant Director <br /> PROGRAM COORDINATORS <br /> Jeff Carruesco, REHS, RDI <br /> Willy Ng,REHS <br /> Steven Shih,REHS <br /> Elena Manzo,REHS <br /> Natalia Subbotnikova, REHS <br /> May 26, 2026 <br /> Live Oak GeoEnvironmental <br /> 407 W Oak St <br /> Lodi, CA 95204 <br /> RE: Soil Suitability/Nitrate Loading Study <br /> 20295 S Van Allen Rd, Escalon <br /> APN 245-120-14, SU-26012910 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil Suitability/Nitrate <br /> Loading (SSNL) Study dated April 23, 2026, and has the following comments for your consideration. <br /> The SSNL was prepared to determine the suitability for onsite wastewater treatment system (OWTS) usage <br /> and the potential long-term impact of nitrate to groundwater from the proposed one-bedroom ADU. <br /> Based on the information provided, the EHD can make the following findings: <br /> 1. The SSNLS does not support the suitability for standard OWTS usage pursuant to San Joaquin County <br /> Ordinance Code Title 9-604.010 (d). The nitrate-loading estimate for the existing four-bedroom home <br /> and proposed three-bedroom home OWTS is 12.1 milligrams per Liter (mg/L) of NO3-N (Nitrate as <br /> Nitrogen). The maximum contamination level for NO3-N in groundwater is 10.0 (mg/L) set by the Central <br /> Valley Regional Water Quality Control Board. As a result, an oversized (2,000-gallon) septic tank will be <br /> required to mitigate the excess nitrate level. <br /> 2. The Percolation test conducted on April 13, 2026, yielded percolation rate of 1.54 min/inch. At this rate, <br /> a minimum 20 feet of soil separation is required between bottom of the dispersal field and the <br /> groundwater. The SSNL reports groundwater level at 58 feet below surface grade. (San Joaquin County <br /> OWTS Standard Table 1.10.2). <br /> If you have any questions, please contact Rena' LeRoy, Registered Environmental Health Specialist, at <br /> rleroy@sjgov.org or (209) 616-3021. <br /> Steven Shih, REHSJ�sr <br /> Program Coordinator <br /> CC: Christine Anderson <br /> 20295 S Van Allen Rd <br /> Escalon, CA 95320 <br /> 1868 E. Hazelton Avenue I Stockton, California 95205 1 T 209 468-3420 1 F 209 464-0138 <br />