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May 11, 2021 <br />FOR: San Joaquin County Environmental Health Department (EHD) <br />Mr. Steven Shih, REHS, Program Manager <br />1868 Hazelton Ave. <br />Stockton, CA 95205 <br />PROJECT: Mr. Salvador Serna <br />76 West Bowman Road, APN 193-260-19 <br />French Camp, California 95231 <br />SR0083332 <br />SUBJECT: Onsite Wastewater Treatment System (OWTS) Design Addendum <br />Reference is made to the project noted above. I am submitting this Addendum to change the effluent pump <br />configuration. Previous EHD Administrations required a duplex pump system on all onsite wastewater <br />treatment systems where a pressurized system was specified. The current EHD Administration will now <br />allow a simplex (single) pump system exclusively for residential projects where effluent must be low -head <br />or high -head pressurized for delivery to the soil. Consequently, I am changing my original specification of a <br />duplex pump system for this project to a simplex system. The Orenco Biotube pump vault specified (P/N: <br />PVU-68-18-19) will remain the same with only one pump installed in the pump vault. <br />As designed, the pump unit must have a Control Panel that contains an audible and visual alarm system to <br />alert people inside the accessory unit dwelling of effluent pump failure. Upon pump failure, the homeowner <br />must immediately, or as soon as practical, contact a pumping company to pump the septic tank to allow <br />storage/surge capacity until the pump can be repaired or replaced. The homeowner must test the alarm <br />system per the manufacturer's recommendations, or at least once per month. <br />If there are any questions regarding this Addendum, please contact the undersigned. <br />Respectfully submitted, <br />CHESNEY CONSULTING �6ytofessf.' <br />4 � � <br />No. 7s479 <br />Don Chesn , PE <br />Registered Civil Engin ee #C75479 <br />�rar Civil <br />P.O. Box 3794 ❑ Turlock, CA 95381 ❑ 209.402.1652 ❑ ddchesneyna charter.net <br />