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SAKOAQUIN Environmental Health Department <br /> COUNTY Kasey Foley, REHS, Interim Director <br /> c9liFoar'�P Greatness grows here. PROGRAM COORDINATORS <br /> Robert McClellon, REHS <br /> Jeff Carruesco, REHS, RDI <br /> Willy Ng,REHS <br /> Muniappa Naidu,REHS <br /> Michael Kith, REHS <br /> Melissa Nissim,REHS <br /> March 9, 2020 <br /> Cortopassi Farms <br /> 11292 N. Alpine Road <br /> Stockton, Ca 95212 <br /> RE: Soil Suitability/Nitrate Loading Study <br /> 11065 North Alpine Road, Stockton <br /> APN 063-040-23, SR0081473 <br /> Questa Engineering Corp reviewed the Soil Suitability/Nitrate Loading (SSNL) Study, dated November 20, <br /> 2019, for the Environmental Health Department (EHD). EHD reviewed the addendum to the SSNL dated <br /> February 27. 2020 and submitted to EHD on February 28, 2020. <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 approximately 1,873 square foot four bedroom <br /> three bathroom residence with potential average daily flow of 250 gallons per day. <br /> Based on the information provided, the EHD can make the following findings: <br /> 1. The SSNL Study supports the suitability for standard OWTS usage for the proposed development <br /> project on the above mentioned parcel, pursuant to San Joaquin County Ordinance Code Title 9, <br /> Section 9-1105.2(d), provided proposed OWTS and 100% replacement area can meet all required <br /> minimum setbacks from any water wells. <br /> 2. Percolation test conducted at above parcel has the percolation rate of 27.7 minutes per inch at the <br /> depth of 21 feet. The dispersal field shall maintain the minimum distance of 8 feet from the bottom <br /> of the dispersal system to the groundwater. <br /> 3. The water sample data show the onsite water well has an elevated level of Nitrate as Nitrogen of <br /> 15.0 mg/L and may not be a suitable source for the potable water supply for new development. A <br /> potable water supply that can provide a consistent source of safe and clean water adequate for <br /> human consumption, cooking, and sanitary purposes for the proposed project needs to be <br /> established prior to the issuance of building permits (2016 CA Plumbing Code, Section 601.2). <br /> If you have any questions please contact Michael Kith, REHS, Program Coordinator at mkith(aD_slgov.orq or <br /> (209) 468-3444. <br /> Michael Kith, REHS <br /> Program Coordinator <br /> c: Terracon Consultants, Inc. <br /> Acosta Construction <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 />