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?3Aew UIN <br /> _01. <br /> Q mental Health Department <br /> SAN JOA <br /> =wry= COUNT'r Kasey Foley, REHS, Interim Director <br /> C(OFT <br /> y Greotnzssrov;s here, <br /> 9 PROGRAM COORDINATORS <br /> Robert McC'llon,REHS <br /> Jeff Carruesco,REHS RDI <br /> VI11y Ng, REHS <br /> Muniappa Naidu, REHS <br /> October 29, 2019 to nhael Kith. REHS <br /> 1Aelis5a Nissim, REHS <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 (O`'VTS) 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) dormitor-y, two 400 SF storage containers, and <br /> tree temporary tents totaling 4,183 SF on a 4.x30 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 A 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/l, which exceeds the drinking water standard of 10.0 mg/f. <br /> Based on the information provided. the EHD can make the following findings <br /> 1. The SSNL Study supports the suitability for OWTS usage vvith 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 Boards OWTS Policy (Boards Policy). <br /> b. A Registered Civil Engineer shall submit complete engineered design plan to END 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. The OWTS shall have a minimum distance of 20 feet from the bottom of dispersal system to <br /> 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 systern, quarterly sampling of the <br /> effluent and under leach field is required. The first sampling shall be done six (6) months after <br /> the OUVTS installation. Sampling results shall be submitted to EHD for review. The EHD may <br /> reduce the sampling frequency after one year of sampling. <br /> 2. 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 develcpment. 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 1 T 209 46E-3420 I F 209 464-0138 ,-rvw,sjgov org�eh:l <br />