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�Ulry� <br /> °mac°y�, SAN _:J�AQU IN Environmental Health Department <br /> COUNTY Wayne Fox, RENS, Interim Director <br /> FO Greatness grows here. PROGRAM COORDINATORS <br /> Robert McClellon,REHS <br /> Jeff Carruesco, REHS, RDI <br /> Willy Ng,REHS <br /> D Muniappa Naidu, REHS <br /> Michael Kith, REHS <br /> Melissa Nissim, RENS <br /> June 11, 2020 CO <br /> Mike & Deana Thornton <br /> 7095 East Sedan Avenue <br /> Manteca, California 95337 <br /> RE: Soil Suitability/Nitrate Loading Study <br /> 7095 East Sedan Avenue <br /> APN: 22610018, SR0082091 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil <br /> Suitability/Nitrate Loading (SSNL) Study, dated May 15, 2020 for the above noted location and has <br /> the following comments for your consideration. <br /> The SSNL was prepared to determine the suitability of the above noted parcel for onsite wastewater <br /> treatment system (OWTS) usage and the potential long term impact of nitrates to groundwater from <br /> the proposed project development. The proposed development project includes: <br /> 1. A future 3-bedroom home and an existing 3-bedroom home with a total wastewater flow of 450 <br /> gallons per day (gpd) from the following usage. The wastewater flow of 450 gpd is not to be used <br /> for septic system design or size calculation. <br /> Wastewater flow of 225 gpd from the proposed 3-bedroom residence. <br /> Wastewater flow of 225 gpd from the existing 3-bedroom home. <br /> Note: The EHD recommends using 100 gpd for the first bedroom and an additional 50 gpd for each <br /> additional bedroom to estimate long term nitrate loading impact to ground water from a residential <br /> dwelling. <br /> Based on the information provided, the EHD can make the following findings: <br /> The estimated nitrate loading from proposed development shows a potential for nitrate impact to <br /> groundwater above water quality objectives. According to SSNL Study the estimated long-term <br /> impact of nitrate loading from the proposed OWTS usage is 18.8 mg/L-N; above the water quality <br /> objective of 10 mg/L-N. <br /> 1. The SSNL Study supports the suitability for OWTS usage with the following conditions: <br /> a. The potential impact of the nitrate to ground water shall be mitigated. OWTS shall utilize <br /> supplemental treatment and meet performance requirements in Section 10.9 of Regional <br /> Water Quality Control Board OWTS policy (Boards Policy). <br /> b. A Registered Civil Engineer shall submit complete engineering design plans to EHD for <br /> approval prior to issuance of building permit. Fee will be based on the current fee schedule at <br /> time of payment. <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 />