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nuiN <br /> SAN J OA Q U I N Environmental Health Department <br /> COUNTY Jasjit Kang, REHS, Director <br /> c�LiFoaN��- Greotness 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 /> March 9, 2026 <br /> Robert Smith <br /> P.O. Box 22748 <br /> Sacramento, Ca. 95822 <br /> RE: Soil Suitability/Nitrate Loading Study <br /> 350 Critchett Ave. Tracy <br /> APN: 241-110-40; SU-2601167 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil Suitability/Nitrate <br /> Loading (SSNL) Study dated February 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 existing four-bedroom single family <br /> dwelling and the proposed four-bedroom modular home. <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 four-bedroom modular home OWTS is 10.9 milligrams per Liter(mg/L) of NO3-N (Nitrate <br /> as Nitrogen). The maximum contamination level for NO3-N in groundwater is 10.0 (mg/L) set by the <br /> Central Valley Regional Water Quality Control Board. As a result, an oversized (2,000-gallon) septic <br /> tank will be required to mitigate the excess nitrate level. <br /> 2. The Percolation test conducted on February 6, 2026, yielded a percolation rate of 27.8 MPI. At this <br /> rate, 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 (San Joaquin County OWTS <br /> Standard Table 1.10.2); however, the SSNL reports groundwater level at 11.25 feet below surface <br /> grade. Furthermore, a mounded on-site sewage disposal system may be required to meet the minimum <br /> 8-feet soil separation required between the dispersal field and groundwater. A liquid waste consultation <br /> inspection may be requested to demonstrate that the OWTS will meet the 8-feet soil separation <br /> between the dispersal field and groundwater, if you wish not to pursue a mounded OWTS. <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:gr� <br /> Steven Shih, REHg6r <br /> Program Coordinator <br /> Cc: Abby Racco, LiveOak Geo Environmental Inc., 407 W Oak St., Lodi, Ca. 95240 <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 />