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"I,--..r ° Environmental Health Department <br /> ° SAN 4JOAQUIN <br /> COUNTY Jasjit Kang, REHS, Director <br /> OP Muniappa Naidu,REHS,Assistant Director <br /> 14.1 a�' Greatness grows here. PROGRAM COORDINATORS <br /> Robert McClellon,REHS <br /> Jeff Carruesco,REHS,RDI <br /> Willy Ng,REHS <br /> Melissa Nissim,REHS <br /> Steven Shih,REHS <br /> April 27, 2021 ORIGINAL <br /> Anton & Denise Rivera <br /> 2111 Waudman Ave <br /> Stockton, CA 95209 <br /> RE: Soil Suitability/Nitrate Loading Study <br /> 2111 Waudman Avenue, Stockton <br /> APN 080-290-26, SR0083523 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil Suitability/Nitrate <br /> Loading (SSNL) Study, dated April 1, 2021 for the above noted location, and has the following comments for <br /> your consideration. <br /> The SSNL was prepared to determine the suitability of the above noted parcel for onsite wastewater treatment <br /> system (OWTS) usage and the potential long-term impact of nitrate to groundwater for the following proposed <br /> three-bedroom second unit dwelling. <br /> Based on the information provided, the EHD can make the following findings: <br /> a. According to the SSNL, the estimated nitrate loading from existing and proposed OWTS usage is <br /> 18.73 mg/L as nitrate-nitrogen and the maximum contaminant level of 10 mg/L-N. EHD will require <br /> the mitigation of nitrate-nitrogen through an engineered Onsite Wastewater Treatment System. <br /> b. Percolation test conducted on March 23, 2021 yield percolation rate of 4.38 min/inch. At this rate, <br /> a 20' soil separation is required between bottom of dispersal field and groundwater. Groundwater <br /> at site is 20-30' below ground surface. (San Joaquin County OWTS Standard Section 1.10.2). <br /> c. A Registered Civil Engineer shall submit complete engineering design plan to EHD for approval <br /> prior to issuance of building permit. The engineer plan shall mitigate above-mentioned concerns. <br /> Fee will be based on the current fee schedule at time of payment. <br /> If you have any questions please contact Naseem Ahmed, Senior Registered Environmental Health <br /> Specialist, at nahmed@sjgov.org or (209) 616-3018. <br /> Steven Shih, REHS <br /> Program Coordinator <br /> c: AdvancedGeo <br /> 1868 E. Hazelton Avenue I Stockton, California 952051 T 209 468-3420 1 F 209 464-0138 1 www.sjgov.org/ehd <br />