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° 0 SAN JOAQUIN <br />4 COUNTY <br />C9(IF OP�`P,' Greatness grows here. <br />November 22, 2021 <br />Carl Navarra <br />475 W. Blewett Rd. <br />Tracy, CA 95304 <br />RE: Soil Suitability/Nitrate Loading Study <br />32521, 32619, & 32705 S. Koster Rd., Tracy <br />APN 255-100-26, -35, & -36, SR0084478 <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 />The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil Suitability/Nitrate <br />Loading (SSNL) Study, dated November 12, 2021 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 minor subdivision. <br />Based on the information provided, the EHD can make the following findings: <br />a. According to the SSNL, the estimated nitrate loading from existing and proposed OWTS usage for <br />the three parcels are the following: Parcel 1) 7.0 mg/L-N, Parcel 2) .15 mg/L-N, Parcel 2) (2 <br />homes) 1.9 mg/L-N, and Parcel 3) was 0.3 mg/L-N as nitrate -nitrogen and the maximum <br />contaminant level of 10 mg/L-N. <br />b. The Percolation test conducted on October 28, 2021 yielded a percolation rate of 5.2 min/inch. <br />At this rate, a minimum 8 feet of soil separation is required between bottom of the dispersal field <br />and the groundwater. The SSNL reports a historic groundwater level of 50 to 75 feet below <br />surface grade. (San Joaquin County OWTS Standard Table 1.10.2). <br />c. The OWTS and its 100% replacement areas shall meet all required minimum setbacks stated in <br />San Joaquin County (OWTS) Standard and Well Standard. <br />If you have any questions please contact Aldara Salinas, Environmental Health Specialist, at <br />asalinas@sjgov.org or (209) 616-3019. <br />r <br />S even Shi , RE S <br />Program Coordinator <br />c: LiveOak <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 />