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�oAn. U!N co q <br /> -T z, SAN J O A Q U I N Environmental Health Department <br /> 1tn `' COUNTY <br /> Linda Turkatte, REHS, Director <br /> i'CgCIFOR�\P� Greatness grows here. Kasey Foley,REHS,Assistant Director <br /> PROGRAM COORDINATORS <br /> Robert McClellon,REHS <br /> Jeff Carruesco,REHS, RDI <br /> Willy Ng,REHS <br /> Muniappa Naidu,REHS <br /> Michael Kith,REHS <br /> June 28, 2019 <br /> Abel Martinez <br /> 9213 West Lorraine Road COPY <br /> Tracy CA 95337 <br /> RE: Soil Suitability/Nitrate Loading Study <br /> 9216 W Lorraine Road, Tracy <br /> APN 248-060-24, SR0080542 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil Suitability/Nitrate <br /> Loading (SSNL) Study, dated April 19, 2019 and received on May 22, 2019, for the above noted location and <br /> has the following comments for your consideration. <br /> • The SSNL 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 proposed <br /> second unit dwelling on approximately 0.97 acres. <br /> • San Joaquin County Assessor's Office information indicates the existing house on the property is a 2- <br /> bedroom house. The nitrate loading calculation was based on wastewater contribution from a 1- <br /> bedroom house and the resultant nitrate impact may be underestimated. <br /> • Pump permit data show the standing water level in the site well to be 66 feet in 1998 and 82 feet in a <br /> nearby well in 2018. <br /> • The onsite water well showed an elevated Nitrate Nitrogen level of 9.9 mg/L, only 0.1 mg/I below the <br /> drinking water standard of 10.0 mg/L. Several nearby wells showed levels of nitrate contamination <br /> above the 10.0 mg/I drinking water standard. <br /> Based on the information provided, the existing OWTS serving a two bedroom dwelling and a new OWTS to <br /> serve a second unit dwelling with a maximum of two bedrooms will not likely contribute significant nitrate to <br /> groundwater. However, the data indicates the shallow aquifer being utilized for drinking water has elevated <br /> levels of nitrate and may not be a suitable source for the potable water supply for new development.A potable <br /> water supply that can provide a consistent source of safe and clean water adequate for human consumption, <br /> cooking, and sanitary purposes for the proposed new home needs to be determined prior to the issuance of <br /> building permits (2016 CA Plumbing Code, Section 601.2). <br /> If you have any questions please contact Jeffrey Wong, Lead Senior Registered Environmental Health <br /> Specialist, at jwong(&slgov.org or (209) 468-0335. <br /> Michel Kith, REHS <br /> Program Coordinator <br /> c: Abby Racco, Live oak GeoEnvironmental, Inc. <br /> 1868 E. Hazelton Avenue I Stockton, California 95205 1 T 209 468-3420 1 F 209 464-0138 1 www.sjcehd.com <br />