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SAN ,J0 A QU IN Environmental Health Department <br /> i` C O U N T Y--- Wayne Fox, REHS, Interim Director <br /> \°q °'/ 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 /> August 10, 2020 ORIGINAL <br /> German Jimenez <br /> Jimenez Property <br /> 124 W. Briggs Rd <br /> Lathrop, CA 95330 <br /> RE: Soil Suitability/Nitrate Loading Study <br /> 124 W. Briggs Ave, Lathrop <br /> APN 193-330-37, SR0082357 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil Suitability/Nitrate <br /> Loading (SSNL) Study, dated July 7, 2020 and submitted July 22, 2020 for the above noted location and has <br /> the following comments for your consideration. <br /> 1. The SSNL study was prepared for the expansion of existing home to three-bedrooms and construction <br /> of a new five bedrooms home with total Onsite Wastewater Treatment System (OWTS) usage of 500 <br /> gallons per day of wastewater. The 500 gallons of wastewater volume is not to be used for septic <br /> design or size calculation. <br /> Based on the information provided, the EHD can make the following findings: <br /> According to SSNL Study, the estimated long-term impact of nitrate loading from the proposed OWTS usage <br /> is 16.4 mg/L-N; it is above the water quality objective of 10 mg/L-N. <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 Water <br /> Quality Control Board OWTS policy (Boards Policy). <br /> b. A Registered Civil Engineer shall submit complete design plan for engineer system to mitigate <br /> nitrates to EHD for approval prior to issuance of building permit. Fee will be based on the current <br /> fee schedule at time of payment. <br /> c. The engineer design plan shall be in compliance with San Joaquin County (OWTS), Local Area <br /> Management Plan and Board Policy. <br /> d. Percolation test conducted on June 25, 2020 yield rate of 1.3 min/inch. At this rate, a minimum 20' <br /> of soil separation is required between bottom of dispersal field and groundwater. <br /> If you have any questions please contact Naseem Ahmed, Senior Registered Environmental Health <br /> Specialist, at nahmed a }gev.org or (209) 468-3436. <br /> Michael Kith, REHS <br /> Program Coordinator <br /> C: LiveOak <br /> 1868 E. Hazelton Avenue I Stockton, California 952051 T 209 468-3420 1 F 209 464-0138 1 www.sjgov.org/ehd <br />