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SAN JOAQUIN <br />COUNTY---- <br />AM <br />OUNTY--- <br />Greotness grows here. <br />March 2311, 2022 <br />Mr. & Mrs. Rob & Jenny Erskine <br />30667 South KOSA(�XRd., <br />Tracy, Ca., 95304 <br />RE: Soil Suitability/Nitrate Loading Study <br />30667 South Koster Rd.,Tracy, Ca. 95304 <br />APN 255-320-11, SR0084983 <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 />The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil Suitability/Nitrate <br />Loading (SSNL) Study, dated March 9, 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 Commercial Shop. <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 <br />was 8.10 mg/L-N as nitrate -nitrogen and the maximum contaminant level of 10 mg/L-N. <br />b. The Percolation test conducted on February 26th, 2022 yielded a percolation rate of 17.9 <br />min/inch. At this rate, a minimum 8 feet of soil separation is required between bottom of the <br />dispersal field and the groundwater. The SSNL reports a historic groundwater level of 25 to 40 <br />feet below 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 />;teVnVih/,RtHaSZ_ <br />Program Coordinator <br />c: Chesney Consulting <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 />