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<br />„ SAN:JOAQUIN <br />COUNTY <br />Greatness grows here. <br />mental Health Department <br />Kasey Foley, REHS, Interim Director <br />PROGRAM COORDINATORS <br />Robert McClellan, REHS <br />Jeff Carruesco, REHS, RDI <br />Willy Ng, REHS <br />Muniappa Naidu, REHS <br />Michael Kith, REHS <br />Melissa Nissim, REHS <br /> <br /> <br />October 29, 2019 <br /> <br />David Miraflor <br />Line 2 Design <br />PO Box 690218 <br />Stockton, Ca 95269 <br />RE: Soil Suitability/Nitrate Loading Study <br />11265 Thornton Road, Stockton <br />APN 055-200-03, PA-1600266, SR0080888 <br />The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil Suitability/Nitrate <br />Loading (SSNL) Study, conducted by Terracon Consultants, Inc., dated July 11,2019, submitted on July 15, <br />2019 for the above noted location, and has the following comments for your consideration. <br />The SSNL Study was prepared to determine the suitability of the above noted parcel for onsite wastewater <br />treatment system (OVVTS) usage and the potential impact of nitrate to groundwater for a development project <br />at above noted location. The development project includes an existing 5-bedroom dwelling, a detached man <br />and woman restroom, and a proposed 4,183 square foot (SF) dormitory, two 400 SF storage containers, and <br />tree temporary tents totaling 4,183 SF on a 4.60 acres parcel. <br />The estimated nitrate loading from this development project shows a potential for nitrate impact to <br />groundwater above water quality objectives. According to SSNL Study, the estimated nitrate loading from this <br />development project ranges from 21.4 mg/L-N to 33.3 mg/L-N. In addition, the onsite water well already shows <br />an elevated Nitrate Nitrogen level of 27.0 mg/I, which exceeds the drinking water standard of 10.0 mg/I. <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 />The potential impact of the Nitrate to ground water shall be mitigated. OVVTS shall utilize <br />supplemental treatment and meet performance requirements in Section 10.9 of Regional <br />Water Quality Control Boards OVVTS Policy (Boards Policy). <br />A Registered Civil Engineer shall submit complete engineered 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 />The OVVTS shall have a minimum distance of 20 feet from the bottom of dispersal system to <br />groundwater. <br />Annual permit is required. Fee for annual operating permit is due at time of OVVTS permit <br />application. <br />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 <br />the OVVTS installation. Sampling results shall be submitted to EHD for review. The EHD may <br />reduce the sampling frequency after one year of sampling. <br />The data indicates the onsite water well has elevated levels of nitrate and may not be a suitable source <br />for the potable water supply for new development. A potable water supply that can provide a consistent <br />source of safe and clean water adequate for human consumption, cooking, and sanitary purposes for <br />1868 E. Hazelton Avenue I Stockton, California 95205 I T 209 468-3420 I F 209 464-0138 I www.sjgov.org/ehd