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SAN JOAQUIN <br />COUNT Y-- <br />�gtiP'; Greatness grows here. <br />April 25, 2022 <br />Chester Martin <br />10800 E. West Ripon Road <br />Ripon, CA 95366 <br />RE: Soil Suitability/Nitrate Loading Study <br />10800 E. West Ripon Road, Ripon <br />APN: 25724062, SR0085147 <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 />Steven Shih, REHS <br />Michelle Henry, REHS <br />The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil Suitability/Nitrate <br />Loading Study (SSNL) dated 30 March 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) usage and the potential long-term nitrate loading impact to groundwater from the existing <br />three-bedroom house and the proposed three-bedroom modular 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 12.33 mg/L of <br />NO3-N (Nitrate as Nitrogen); the maximum contamination level for NO3-N in groundwater is 10.0 mg/L <br />set by the Central Valley Regional Water Quality Control Board. An oversized septic tank is required <br />for the proposed OWTS to increase removal of Total -Nitrogen in the liquid waste (Onsite Nitrogen <br />removal, Oakley, page 12). <br />b. Percolation test conducted on 25 March 2022 yields a percolation rate of 2.68 min/inch. At this rate <br />an 20' soil separation is required between bottom of dispersal field and the groundwater. Groundwater <br />is reported 25 feet to 30 feet below ground level. (San Joaquin County OWTS Standard Table 1.10.2). <br />If you have any questions please contact Aaron Gooderham, <br />REHS, at agooderham@sjgov.org or (209) 616-3062. <br />7 <br />f� <br />jer— Steven Shih, REHS <br />Program Coordinator <br />CC: Advanced Geo, Inc. <br />837 Shaw Road, <br />Stockton, CA 95215 <br />Registered Environmental Health Specialist, <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 />