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•V'^`:, SAN JOAQUIN <br />('l`J COUNTY— <br />c�i� Greatness grows here <br />January 3, 2019 <br />Javier Leon <br />484 Pestana Ave <br />Manteca, CA 95336 <br />RE: Soil Suitability/Nitrate Loading Study <br />228 KID Rd, Lathrop <br />APN 191-24-018, SR0081371 <br />Environmental Health Department <br />Kasey Foley, REHS, Interim Director <br />PROGRAM COORDINATORS <br />Robert Mcclellon, REHS <br />Jeff Carruesco, REHS, RDI <br />Willy Ng, REHS <br />Munlappa Naidu, REHS <br />Michael Kith, REHS <br />Melissa Nissim, REHS <br />The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil Suitability/Nitrate <br />Loading (SSNL) Study, dated October 23, 2019, submitted on November 5, 2019, for the above noted <br />location, 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 />system (OWTS) usage and the potential impact of nitrate to groundwater for the proposed project <br />development. The proposed development project includes: <br />1. A 1,620 square foot two bed -room residence. <br />2. The OWTS usage with waste water of 280 gallons a day from existing residence and 280 gallons a <br />day from proposed two bedroom residence totaling in 456 gallons a day. <br />The estimated nitrate loading from this existing and proposed usage shows a potential for nitrate impact to <br />groundwater above water quality objectives. According to SSNL Study, the estimated nitrate loading from this <br />existing and proposed OWTS usage is 14.96 mg/L-N; it is above the water quality objective of 10 mg/L-N. <br />Based on the information provided, the EHD can make the following findings. <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 Water <br />Quality Control Board OWTS policy (Boards Policy). <br />b. A Registered Civil Engineer shall submit complete engineering design plan to EHD for approval <br />prior to issuance of building permit. Fee will be based on the current fee schedule at time of <br />payment. <br />c. Percolation test conducted at the site percolates at the rate of 20.83 minute per inch. The OWTS <br />shall have a minimum distance of 8 feet from bottom of dispersal system to groundwater. <br />d. Annual permit is required. Fee for annual operating permit is due at time of OWTS permit <br />application. <br />e. To monitor the effectiveness of the supplemental treatment system, quarterly sampling of the <br />effluent and under leach field is required. The first sampling shall be done six (6) months after the <br />OWTS installation. Sampling results shall be submitted to EHD for review. The EHD may reduce <br />the sampling frequency after one year of sampling. <br />1868 E. Hazelton Avenue I Stockton, California 95205 j T 209 468-3420 1 F 209 464-0138 1 www.sjgov.org/ehd <br />228 Klo Rd, Stockton <br />Page 2 <br />2. The water sample data show the well being utilized for drinking water has an elevated level of nitrate <br />nitrogen of 63.0 mg/L and may not be a suitable source for the potable water supply for new <br />development. A potable water supply that can provide a consistent source of safe and clean water <br />adequate for human consumption, cooking, and sanitary purposes for the proposed project prior to <br />the issuance of building permits (2016 CA Plumbing Code, Section 601.2). <br />If you have any questions please contact Naseem Ahmed, Registered Environmental Health Specialist, <br />REHS, at nahm�ed@sjgov.org or (209) 468-3436. <br />1 <br />Michael Kith, REHS <br />Program Coordinator <br />c: Advanced GeoEnvironmental <br />Nitrate well 10/17/15 <br />