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pP,C!U1N C A <br /> SAN ,� DAQ N Environmental Health Department <br /> COUNTY Jasjit Kang, REHS, Director <br /> 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 <br /> April 21, 2022 Michelle Henry, REHS <br /> Jose Valdovinos, Contractor <br /> 733 Shadowbrook Lane <br /> Manteca, CA 95336 <br /> RE: Soil Suitability/Nitrate Loading Study <br /> 17650 Austin Road, Manteca <br /> APN: 20820015, SR0085141 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil Suitability/Nitrate <br /> Loading Study (SSNL) dated April 6, 2022 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 from the following <br /> proposed 3-bedroom home. <br /> Based on the information provided the EHD can make the following findings: <br /> a. The SSNL reports a nitrate-loading estimate for the existing and proposed OWTS of 13.25 mg/L of <br /> NO3-N; the maximum contamination level for NO3-N in groundwater is 10.0 mg/L set by the Central <br /> Valley Regional Water Quality Control Board. An oversized septic tank is required for the proposed <br /> OWTS to increase removal of Total-Nitrogen in the liquid waste (Onsite Nitrogen removal, Oakley, <br /> page 12). <br /> b. Percolation test conducted on March 10, 2022 yield percolation rate of 6.67 min/inch. At this rate an <br /> 8' soil separation is required between bottom of dispersal field and the groundwater. Groundwater is <br /> reported at 40 ft. - 50 ft. below ground surface. (San Joaquin County OWTS Standard Table 1.10.2). <br /> c. The well water from the existing water well shall be analyzed for the chemical DBCP <br /> (Dibromochloropropane), Arsenic, and Nitrates (as Nitrogen). The water shall be analyzed by a state <br /> certified lab. Results shall be submitted to EHD as they become available. (SJC OWTS Standard <br /> 3.7.2) <br /> If you have any questions please contact Aaron Gooderham, Registered Environmental Health Specialist, <br /> REHS, at agooderham@sjgov.org or (209) 616-3062. <br /> i <br /> f Steven Shih, REHS <br /> Program Coordinator <br /> CC: Baez Geotechnical Group <br /> PO BOX 296 <br /> Oakdale, CA 95361 <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 />