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S A N J O A Q U I N Environmental Health Department <br /> COUNTY Jasjit Kang, REHS, Director <br /> Greatness grows here. Muniall 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 9, 2026 <br /> Abby Racco <br /> Live Oak GeoEnvironmental <br /> 407 W. Oak Street, <br /> Lodi, CA 95240 <br /> RE: Soil Suitability and Nitrate Loading Study <br /> 22120 & 22124 E. Butler Lane, Linden CA 95236 <br /> SU-2601231, APN: 093-030-62 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil Suitability and <br /> Nitrate Loading (SSNL) Study dated March 9, 2026, and submitted March 27, 2026, and has the following <br /> comments for 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 (3) bedroom <br /> home and the proposed new two (2) bedroom ADU. The parcel size is 2.73 acres. <br /> Based on the information provided, the EHD can make the following findings: <br /> 1. The SSNL reports a nitrate-loading estimate for the existing and proposed ADU OWTS of 3.83 <br /> milligrams per Liter (mg/L) of NO3-N (Nitrate as Nitrogen); the maximum contamination level for <br /> NO3-N in groundwater is 10.0 (mg/L) set by the Central Valley Regional Water Quality Control <br /> Board. <br /> 2. Based on the information provided the EHD finds that the SSNL Study supports the suitability for <br /> standard OWTS usage for the proposed development pursuant to San Joaquin County <br /> Development Title, Section 9-604.010(d). <br /> 3. The Percolation tests conducted on February 26, 2026, for the shallow percolation yielded 22.7 <br /> MPI and the deep percolation test yielded 2.03 MPI. At this rate, a minimum of 20 feet of soil <br /> separation is required between the bottom of the dispersal field and the groundwater as mitigated <br /> by the proposed standard septic system. The SSNL reports groundwater level at about 180 to <br /> 208 feet below surface grade. (San Joaquin County OWTS Standard Table 1.10.2). <br /> 4. Obtain an installation permit for the residential onsite wastewater treatment system (OWTS) from <br /> EHD. Inspection is required before backfilling of OWTS excavations. Request inspection 24 hours <br /> in advance by calling the inspection line (209) 953-7697. (SJC OWTS Standard Section 2) <br /> 5. 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 209 468-3877 1 www.sjgov.org/ehd <br />