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°�U' SANAOAQUIN Environmental Health Department <br /> COUNTY Jasjit Kang, REHS, Director <br /> oyIWFO Greatness grows here. 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 /> October 28, 2021 <br /> Tonya Scheftner <br /> Petralogix Engineering, Inc. <br /> 26675 Bruella Rd. <br /> Galt, CA. 95632 <br /> RE: Soil Suitability/Nitrate Loading Study <br /> 476 N. Patton Ave., Stockton <br /> APN: 103-130-15 SR0084372 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil Suitability/Nitrate <br /> Loading Study (SSNL) dated August 2021 for the above noted location and has the following comments for <br /> your consideration. <br /> The SSNL was prepared to determine the suitability of the above noted parcel for onsite wastewater treatment <br /> system (OWTS) usage and the potential long-term nitrate loading impact to groundwater for the following <br /> proposed accessory dwelling unit (ADU). <br /> Based on the information provided the EHD can make the following findings: <br /> 1. According to the SSNL, the estimated nitrate loading from the proposed OWTS usage is 11.2 mg/L as <br /> nitrate-nitrogen and the maximum contaminant level of 10 mg/L-N. EHD will require an oversized <br /> septic tank for installation of a standard Onsite Wastewater Treatment System. <br /> 1. The Percolation test conducted on September 28, 2021 yielded a percolation rate of 3.21 min/inch. <br /> At this rate, a minimum 20 feet of soil separation is required between bottom of the dispersal field <br /> and the groundwater. The SSNL reports a historic groundwater level of 110 feet below surface <br /> grade. (San Joaquin County OWTS Standard Table 1.10.2). <br /> 2. The OWTS and its 100% replacement areas shall meet all required minimum setbacks stated in San <br /> Joaquin County (OWTS) Standard and Well Standard. <br /> If you have any questions please contact Michael Suszycki, Senior Registered Environmental Health <br /> Specialist, REHS, at msuszycki@sjgov.org or (209) 589-7001. <br /> Steven Shih, REHS <br /> Program Coordinator <br /> CC: Paul Armanino, 476 N. Patton Ave., Stockton, CA. 95215 <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 />