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qu <br />c SAN JOAQUIN <br />{' <br />-COUNTY-Greatness grows here. <br />October 11, 2022 <br />Cesar Palacios <br />Dillion & Murphy Engineering <br />PO BOX 2180 <br />Lodi, CA 95241 <br />RE: Soil Suitability/Nitrate Loading Study <br />4747 E Acampo Rd., Acampo, CA. 95220 <br />APN 017-030-30, SR0085848 <br />Environmental Health Department <br />Jasjit Kang, REHS, Director <br />Muniappa Naidu, REHS, Assistant Director <br />PROGRAM COORDINATORS <br />Robert McClellon, REHS <br />Jeff Carruesco, REHS, RDI <br />Willy Ng, REHS <br />Melissa Nissim, REHS <br />Steven Shih, REHS <br />Michelle Henry, REHS <br />Elena Manzo, REHS <br />The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil Suitability/Nitrate <br />Loading (SSNL) Study, dated September 30, 2022 for the above noted location, and has the following <br />comments for your consideration. <br />The SSNL was prepared to determine the suitability of the above noted parcel for onsite wastewater treatment <br />system (OWTS) for a proposed second dwelling unit. <br />Based on the information provided, the EHD can make the following findings: <br />a. Based on the information provided the EHD finds that the SSNL Study does not support the <br />suitability for standard OWTS usage for the proposed development pursuant to San Joaquin <br />Development Title 9, Section 9-1105.2(d). The proposed OWTS usage will cause a long term <br />buildup of Nitrate -Nitrogen in the groundwater of 19.39 mg/L; this is above the acceptable <br />Maximum Contamination Limit of 10 mg/L established by the California Water Resources Control <br />Board. <br />b. EHD requires an OWTS designed by a California Registered Engineer. Submit engineered OWTS <br />design plans under a service request form to this department for the septic system. The design <br />must mitigate the excessive long term buildup of Nitrate -Nitrogen in the groundwater from the <br />proposed OWTS usage (OWTS Standards Section 7.1, 7.2). <br />c. The Percolation test conducted on August 26, 2022 yielded a percolation rate of 27.8 min/inch. At <br />this rate, a minimum 8 feet of soil separation is required between bottom of the dispersal field and <br />the groundwater. The SSNL reports a historic groundwater level of 75 feet below surface grade. <br />(San Joaquin County OWTS Standard Table 1.10.2). <br />If you have any questions please contact Francisco Garcia Ruiz, Environmental Health Specialist, at <br />fgarciaruiz@sjgov.org or (209) 616-3032. <br />�Z <br />y <br />Steven Shih, REHS <br />Program Coordinator <br />c: Fernando Salinas, 4747 E Acampo Rd, Acampo CA 95220 <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 />