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c`, SAKdOAQUIN <br />` COUNTY <br />�'cy4,P' Greatness grows here. <br />29 August 2022 <br />Live Oak Geo Environmental Attn: Abby Racco <br />407 W. Oak Street <br />Lodi, CA 95240 <br />RE: Soil Suitability/Nitrate Loading Study <br />23380 S. Austin Road, Ripon <br />APN: 22813003, SR0085648 <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 />Elena Manzo, REHS <br />The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil Suitability/Nitrate <br />Loading Study (SSNL) dated 2 August 2022 that was submitted 15 August 2022 for the above noted location <br />and has the following comments for your consideration. <br />The SSNL was prepared to determine the suitability of the above noted parcel for onsite wastewater treatment <br />systems (OWTS) usage and the potential long-term nitrate loading impact to groundwater from the existing <br />septic system. <br />Based on the information provided the EHD can make the following findings: <br />a. Based on the information provided the EHD finds that the SSNL Study does not support the suitability <br />for standard OWTS usage for the proposed development pursuant to San Joaquin County Ordinance <br />Code Title 9, Section 9-1105.2(d). <br />b. Percolation test conducted on 21 July 2022 yields a percolation rate of 2.0 min/inch. At this rate 20' <br />soil separation is required between bottom of dispersal field and the groundwater. Ground water is <br />reported to be approximately 26-27 feet below grade. (San Joaquin County OWTS Standard Table <br />1.10.2). <br />Note: Before excavation activities for the leach field occur depth of the ground water table shall be <br />observed by an REHS from this department. <br />c. The SSNL reports a long-term nitrate loading estimate for the existing and proposed OWTS use of <br />12.73 mg/L of NO3-N (Nitrate as Nitrogen); the maximum contamination level for NO3-N in <br />groundwater is 10.0 mg/L set by the Central Valley Regional Water Quality Control Board. A two - <br />thousand (2000) gallon septic tank is required for the proposed OWTS to increase removal of Total - <br />Nitrogen in the liquid waste (Onsite Nitrogen removal, Oakley, page 12). <br />Note: The septic tank shall be monolithically poured. <br />Note: The existing septic tank shall be replaced with a two -thousand (2000) gallon septic tank when <br />the existing tank is in need of replacement. <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 />.%/ S even Shih, REHS <br />Program Coordinator <br />CC: Sunshine Tijero <br />23380 S. Austin Road <br />Ripon, CA 95366 <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 />