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°P�` SAN 10AQUIN <br />COU N T Y-- <br />°qCikoa�P Greatness grows here. <br />May 16, 2022 <br />Abby Racco <br />Live Oak Geo Environmental <br />407 W. Oak St. <br />Lodi, CA. 95240 <br />RE: Soil Suitability/Nitrate Loading Study <br />11662 N. Ham Road.,Lodi, CA. 95240 <br />APN 059-250-03, SR0085175 <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 April 14, 2022 for the above noted location, and has the following comments <br />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 repair to the existing leachfield. There is no proposed addition(s) to the <br />existing Mobile Home Park. <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 12.44 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. The Percolation test conducted on March 22, 2022 yielded a percolation rate of 13.9 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 60 - 62 feet below surface <br />grade. (San Joaquin County OWTS Standard Table 1.10.2). <br />c. 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 repair. The <br />design must mitigate the excessive long term buildup of Nitrate -Nitrogen in the groundwater from <br />the proposed OWTS usage (OWTS Standards Section 7.1, 7.2). <br />If you have any questions please contact Frank Girardi, Senior Registered Environmental Health Specialist, <br />at fvgirardi@sjgov.org or (209) 616-3044. <br />A* <br />Steven Shih, R HS <br />r Program Coordinator <br />c: Environmental Enterprises Inc., 71 Chicory Rd., Chico, CA 95928 <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 />