Laserfiche WebLink
pUTA/ - Pr <br /> (+ <br /> '� c°G J A N J 0 A Q U I N mental Health Department <br /> J <br /> CV <br /> Q <br /> �'. COUNTY <br /> Kasey Foley, REHS, Interim Director <br /> cgI1 PO Greatness grows here. PROGRAM COORDINATORS <br /> Robert McClellon,REHS <br /> Jeff Carruesco, REHS, RDI <br /> Willy Ng, REHS <br /> Muniappa Naidu,REHS <br /> October 29, 2019 Michael Kith,REHS <br /> Melissa 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 (OWTS) 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/l, 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 /> 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 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. 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 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 OWTS 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 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 1 T 209 468-3420 1 F 209 464-0138 1 www.sjgov.org/ehd <br />