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SA NsJ OAQ U I N Environmental Health Department <br /> COUNTY Jasjit Kang, REHS, Director <br /> G reo t n e s s 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 /> July 2, 2026 <br /> Abby Racco <br /> LiveOak Geo Environmental Inc., <br /> 407 W Oak St., <br /> Lodi, Ca. 95240 <br /> RE: Soil Suitability/Nitrate Loading Study <br /> 29534 South Chrisman Road, Tracy <br /> APN: 253-230-06; SU-2601386 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil Suitability/Nitrate <br /> Loading (SSNL) Study dated March 11, 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 existing three-bedroom single family <br /> dwelling and the proposed one-bedroom Accessory Dwelling Unit. <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 three-bedroom home <br /> and proposed one-bedroom ADU is 11.9 milligrams per Liter (mg/L) of NO3-N (Nitrate as Nitrogen). <br /> The maximum contamination level for NO3-N in groundwater is 10.0 (mg/L) set by the Central Valley <br /> 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 March 4, 2026, yielded a percolation rate of 9.62 MPI. At this rate, <br /> a minimum of 8-feet soil separation is required between the bottom of the dispersal field and <br /> groundwater as mitigated by the proposed standard septic system. Additionally, the SSNL reports <br /> groundwater level between 60 to 85 feet below surface grade. (San Joaquin County OWTS Standard <br /> Table 1.10.2) <br /> 3. Construction of an approved on-site sewage disposal system(s) under permit and inspection by the <br /> Environmental Health Department is required at the time of development based on the Soil Suitability/ <br /> Nitrate Loading Study findings (San Joaquin County Development Title, Section 9-605.010). <br /> 4. It is the owner's responsibility to follow operation and maintenance plan to ensure the system meets all <br /> requirements set forth in the design in conformity with San Joaquin County (OWTS) Standard. <br /> If you have any questions please contact Aldara Salinas, Environmental Health Specialist, at (209) 616-3019 <br /> or asalinas@sjgov.org. <br /> �� <br /> Steven Shih, REH_94�0_ <br /> Program Coordinator <br /> CC: Ana Maria Ureno, 782 Quail Run Cir., Tracy Ca. 95377 <br /> 1868 E. Hazelton Avenue I Stockton, California 95205 1 T 209 468-3420 1 F 209 464-0138 1 www.sjgov.org/ehd <br />