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Chesney Consulting <br /> July 6,2022 <br /> FOR: San Joaquin County Environmental Health Department(EHD) <br /> Mr. Steven Shih, REHS, Program Coordinator <br /> Mr. Jeffrey Wong, REHS <br /> 1868 East Hazelton Ave. <br /> Stockton, CA 95205 <br /> PROJECT: Proposed Equipment Yard/Office Building <br /> 23751 South Bird Road <br /> Tracy, CA 95304 <br /> APN 250-100-15 <br /> SR0085397; PA-1800080(UP) <br /> SUBJECT: Operations and Maintenance Plan(Project No. SSNL-09.22A) <br /> Reference is made to the project indicated above. Under Section 1.12.1 of the SJC EHD Onsite Wastewater <br /> Treatment System(OWTS) Standards,the EHD has requested an Operations and Maintenance Plan for the <br /> engineered system designed to serve the proposed project. <br /> The operation of the OWTS is described on Page 8 of the Soil Suitability/Nitrate Loading(SSNL) Study <br /> Report. Since the disposal area is highly constrained by driveway areas,thus creating a long, narrow effluent <br /> disposal area,the OWTS had to be engineered. However,the operation of the system remains conventional <br /> and therefore,a maintenance plan only addresses those conventional aspects of the system operation. <br /> Although a 1,200 gallon septic tank would have been applicable for this project, a 2,000 gallon tank was <br /> specified for two reasons: First a larger tank traps a much higher percentage of nitrogen than a 1,200 gallon <br /> tank size. Secondly, if Phase I1 of this project is implemented,this large tank size will manage the <br /> anticipated influent wastewater flows without having to remove and replace a smaller tank with a larger tank. <br /> Two maintenance issues can be associated with this specified 2,000 gallon tank: The effluent filter should be <br /> cleaned when the tank is pumped. Although the pumping interval is theoretically many years,this can be <br /> reduced to pumping the tank every three years to remove nitrogen products. At the time of this clean-out,the <br /> effluent filter should be washed off over the manhole of the first compartment. <br /> If there should be questions regarding this document, please contact the undersigned. <br /> Respectfully submitted, <br /> CHESNEY CONSULTING 0a4lofessiod <br /> a <br /> e,� o°D• Ches fct' <br /> No.75479 CD <br /> Don Che ney, PE <br /> Registered Civil E7gierC75479 J, <br /> `a Civil <br /> to of Califot4 <br /> P.O. Box 3794. ❑ Turlock, CA 95381 13 209.402.1652 ❑ ddchesneyCa charter.net <br />