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SAN JOAQUIN <br />COUNTY <br />°q0Pi Greatness grows here. <br />FO <br />10 October 2022 <br />Donna Azevedo <br />16402 Escalon Bellota Road <br />Escalon, CA 95320 <br />RE: Soil Suitability/Nitrate Loading Study <br />16402 Escalon Bellota Road, Escalon <br />APN: 22908028, SR0085844 <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 28 September 2022 for the above noted location and has the following <br />comments 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 3 - <br />bedroom house and proposed 2 -bedroom house. <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. The SSNL reports a nitrate -loading estimate for the existing and proposed OWTS of 15.97 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 OWTS designed to reduce nitrate - <br />nitrogen concentration in the wastewater effluent stream to below 10 mg/L. The OWTS will be <br />designed by a California Registered Engineer (SJC OWTS Standard 7.1). <br />c. Submit plans for a residential OWTS that reduces nitrate -nitrogen concentration in the wastewater <br />effluent stream to below 10 mg/L; the plans shall be approved by EHD prior to issuance of a building <br />permit. Complete a service request form and submit a review fee along with the OWTS design. The <br />fee will be based on the current fee schedule. <br />d. Percolation test conducted on 27 September 2022 yield percolation rate of 3.33 min/inch. At this rate <br />20' soil separation is required between bottom of dispersal field and the groundwater. Groundwater is <br />reported at 70 feet below ground level (San Joaquin County OWTS Standard Table 1.10.2). <br />e. The onsite well water has a nitrate -nitrogen concentration of 13 mg/L. Nitrate -nitrogen in drinking water <br />at levels above 10 mg/L is a health risk for infants of less than six months of age. Such nitrate levels <br />in drinking water can interfere with the capacity of the Infants below the age of six months who drink <br />water containing nitrate in excess of the MCL may quickly become seriously ill and, if untreated, may <br />die because high nitrate levels can interfere with the capacity of the infant's blood to carry oxygen. <br />Symptoms include shortness of breath and blueness of the skin. High nitrate levels may also affect <br />the oxygen -carrying ability of the blood of pregnant women. <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 />Steven'Sh h, REHS <br />Program Coordinator CC: AdvancedGeo, Inc. <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 />