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SAN J0AQUIN Environmental Health Department <br /> COUNTY Jasjit Kang, REHS, Director <br /> c,FOFa' 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 /> December 15, 2025 <br /> Maxwell E. Niemeyer <br /> AdvancedGeo <br /> 837 Shaw Road, <br /> Stockton, CA 95215 <br /> RE: Soil Suitability and Nitrate Loading Study <br /> 9128 S. Priest Road, French Camp <br /> SU-2500946, APN: 193-220-78 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil Suitability and <br /> Nitrate Loading (SSNL) Study dated August 27, 2025, first revision received November 20, 2025, and <br /> second revision received December 1, 2025, and has the following 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 existing three-bedroom dwelling <br /> and the proposed new two-bedroom ADU. The parcel size is 2.42 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 11.46 <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. As stated in the report, an oversized 2,000-gallon septic tank may be utilized in cases <br /> where a 30 percent reduction would bring the nitrate loading under the MCL. The septic system <br /> construction shall follow the San Joaquin County OWTS where applicable. (SJC OWTS Standard <br /> 7.1). <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) with the installation of an oversized 2,000- gallon septic <br /> tank. <br /> 3. The Percolation test conducted on August 22, 2025, yielded a percolation rate of 2.13 MPI. At <br /> this rate, a minimum of 20 feet of soil separation is required between the bottom of the dispersal <br /> field and the groundwater as mitigated by the proposed standard septic system. The SSNL reports <br /> groundwater level at about 25 to 35 feet below surface grade. (San Joaquin County OWTS <br /> Standard Table 1.10.2). <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 />