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QUj- <br /> c S A N 10 A Q U 1 N Environmental Health Department <br /> I" --------COUNT Y <br /> Jasjit Kang, REHS, Director <br /> 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 /> April 30, 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 /> 172 N. Patton Avenue, Stockton CA 95215 <br /> SU-2601279, APN: 103-100-34 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil Suitability and <br /> Nitrate Loading (SSNL) Study dated April 9, 2026, and submitted April 15, 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 3-bedroom home <br /> and proposed new 3-bedroom modular home. The parcel size is 1.03 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 new 3-bedroom <br /> modular home OWTS of 13.1 milligrams per Liter (mg/L) of NO3-N (Nitrate as Nitrogen); the <br /> 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 stated in the report, an oversized septic tank may be <br /> utilized in cases where a 30 percent reduction would bring the nitrate loading under the MCL. The <br /> septic system construction shall follow the San Joaquin County OWTS where applicable. (SJC <br /> OWTS Standard 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 March 31, 2026, yielded a percolation rate of 17.86 minutes <br /> per inch (MPI). At this rate, a minimum of 8 feet of soil separation is required between the bottom <br /> of the dispersal field and the groundwater as mitigated by the proposed standard septic system. <br /> The SSNL reports groundwater level at about 125 to 153 feet below surface grade. (San Joaquin <br /> 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 /> 1868 E. Hazelton Avenue I Stockton, California 95205 1 T 209 468-3420 1 F 209 468-3877 1 www.sjgov.org/ehd <br />