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SANS>JOAQUIN Environmental Health Department <br /> COUNTY Jasjit Kang, REHS, Director <br /> C r- 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 /> April 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 /> 9198 W Lorraine Rd Tracy <br /> APN: 248-060-22; SU-2601237 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil <br /> Suitability/Nitrate Loading (SSNL) Study dated March 4, 2026, and has the following comments for <br /> your consideration. <br /> The SSNL was prepared to determine the suitability for onsite wastewater treatment system (OWTS) <br /> usage and the potential long-term impact of nitrate to groundwater from the existing three-bedroom <br /> single family dwelling and the proposed three-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 <br /> County Ordinance Code Title 9-604.010 (d). The nitrate-loading estimate for the existing three- <br /> bedroom home and proposed three-bedroom modular home OWTS is 13.7 milligrams per Liter <br /> (mg/L) of NO3-N (Nitrate as Nitrogen). The maximum contamination level for NO3-N in <br /> groundwater is 10.0 (mg/L) set by the Central Valley Regional Water Quality Control Board. <br /> As a result, an oversized (2,000-gallon) septic tank will be required to mitigate the excess <br /> nitrate level. <br /> 2. The Percolation test conducted on March 3, 2026, yielded a percolation rate of 4.63 MPI. At <br /> this rate, a minimum of 20-feet soil separation is required between the bottom of the dispersal <br /> field and groundwater as mitigated by the proposed standard septic system. Additionally, the <br /> SSNL reports groundwater level between 70 to 103 feet below surface grade. (San Joaquin <br /> County OWTS Standard Table 1.10.2) <br /> 3. Construction of an approved on-site sewage disposal system(s) under permit and inspection <br /> by the Environmental Health Department is required at the time of development based on the <br /> Soil Suitability/ Nitrate Loading Study findings (San Joaquin County Development Title, <br /> Section 9-605.010). <br /> 4. It is the owner's responsibility to follow operation and maintenance plan to ensure the system <br /> meets all requirements set forth in the design in conformity with San Joaquin County (OWTS) <br /> Standard. <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 />