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"\c , SAN�IOAQUIN p <br /> ° Environmental Health Department <br /> ` COUNTY Jasjit Kang, REHS, Director <br /> �a <br /> IFO 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 19, 2021 <br /> Brent Honnoll <br /> 33503 S. Koster Rd. <br /> Tracy, CA. 95304 <br /> RE: Soil Suitability/Nitrate Loading Study <br /> 33503 S. Koster Rd., Tracy, CA. 95304 <br /> APN: 255-090-320, SR0084281 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil Suitability/Nitrate <br /> Loading Study (SSNL) dated September 20, 2021 for the above noted location and has the following <br /> comments for your consideration. <br /> The SSNL Study was prepared to determine the suitability of the above noted parcel for onsite wastewater <br /> treatment system (OWTS) usage and the potential long-term impact of nitrate to groundwater to construct a <br /> septic system for a two bedroom and two bathroom accessory dwelling unit. <br /> Based on the information provided the EHD can make the following findings: <br /> 1. According to the SSNL, the estimated nitrate loading from existing and proposed Onsite Wastewater <br /> Treatment System (OWTS) usage is 18.5 mg/L as nitrate-nitrogen and the maximum contaminant <br /> level of 10 mg/L-N. EHD will require an engineered OWTS to mitigate the excessive nitrogen. <br /> 2. A Registered Civil Engineer shall submit complete engineering design plans to EHD for approval <br /> (SJC OWTS Standard 7.1 through 7.1.5). The engineered OWTS plans shall demonstrate mitigation <br /> of the estimated long-term nitrate loading from the proposed OWTS and conform to San Joaquin <br /> County OWTS Standards. <br /> A fee will be based on the current fee schedule at time of payment. <br /> 3. Percolation test conducted on September 20, 2021 yield a percolation rate of 9.26 min/inch. At this <br /> rate, minimum 8 feet of soil separation is required between bottom of dispersal field and the <br /> groundwater. The SSNL reports a historic groundwater level of 70 to 80 feet below surface grade. <br /> (San Joaquin County OWTS Standard Table 1.10.2). <br /> 4. 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 Aldara Salinas, Environmental Health Specialist, EHS, at <br /> Xe4n <br /> @sjgov.org or 209 616-3019. <br /> I , <br /> ProgramCoordinator <br /> CC: Petralogix Engineering, Inc.- 26675 Bruella Rd. Galt, Ca. 95632 <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 />