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STATE WATER RESOURCES CONTROL BOARD - 28 - <br /> ORDER <br /> 28 - <br /> ORDER WQ 2014-0153-DWQ <br /> GENERAL WASTE DISCHARGE REQUIREMENTS <br /> FOR SMALL DOMESTIC WASTEWATER TREATMENT SYSTEMS <br /> Table 4: Effluent Limitations for Wastewater Treatment Systems <br /> Step 1 - Effluent Limitations Based on Technology Performance <br /> Activated Sludge, MBR, or similar (not including residential aerobic treatment units) <br /> Constituent Units Limit <br /> BOD mg/L 30 (monthly average), 45 (7-day average) <br /> TSS mg/L 30 (monthly average), 45 (7-day average) <br /> Wastewater Pond or Trickling Filter 1 (not including residential recirculating sand filters) <br /> Constituent Units Limit <br /> BOD mg/L 902 <br /> TSS -- Not Applicable <br /> Step 2 - Effluent Limits Based on Low/High Threat Situation (flow rate >20,000 gpd) <br /> Constituent Units Limit <br /> Total N mg/L -- <br /> Low Threat mg/L 50 % 3 <br /> High Threat mg/L 10 <br /> BOD denotes biochemical oxygen demand; TSS denotes total suspended solids; MBR denotes membrane <br /> biological reactor. Residential denotes a single family home, property caretaker's home, a home with an <br /> associated residence (e.g. mother in law unit), or similar, with a flow rate less than 400 gpd. "—" denotes <br /> not applicable. <br /> 1. Limit applies when treated wastewater is applied to an LAA or to a subsurface disposal system. <br /> 2. The limit is based on a 65-percent reduction of incoming BOD. An incoming BOD of 250 mg/L was <br /> used to calculate the value. <br /> 3. The value represents the minimum percent reduction compared to the untreated wastewater value. <br /> Reduction shall be calculated on an annual basis. In no case shall the reduction result in an effluent <br /> limit lower than 10 mg/L total nitrogen. <br /> E. Provisions <br /> 1. Technical Report Preparation Requirements <br /> a. Within 90 days of the issuance of an NOA, aside from residential septic tanks <br /> serving four or fewer residences, the Discharger shall prepare and implement a <br /> Spill Prevention and Emergency Response Plan (Response Plan) that describes <br /> operation and maintenance activities to prevent accidental releases of wastewater, <br /> and to effectively respond to such releases, minimizing the environmental impact. <br /> At a minimum, the Response Plan shall address the following: <br /> i. Operation and Control of Wastewater Treatment - A description of the <br /> wastewater treatment equipment, operational controls, flow measurement <br /> and calibration procedures, and treatment system schematic including <br /> valve/gate locations. <br /> September 23, 2014 <br />