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STATE WATER RESOURCES CONTROL BOARD -2 - <br /> ORDER <br /> 2 - <br /> ORDER WQ 2014-0153-DWQ <br /> GENERAL WASTE DISCHARGE REQUIREMENTS <br /> FOR SMALL DOMESTIC WASTEWATER TREATMENT SYSTEMS <br /> evapotranspiration systems. The level of treatment shall be based upon the <br /> wastewater quality and the receiving water quality at the wastewater disposal location. <br /> For flow rates that exceed 20,000 gallons per day (gpd), Attachment 1, Nitrogen <br /> Effluent Limit Evaluation, provides direction in evaluating a discharge and determining <br /> when nitrogen control is required. Seepage pits may be considered part of the <br /> disposal system if inadequate land exists for a leach field dispersal system, other site <br /> conditions require the use of seepage pits, and site conditions are favorable for the <br /> use of seepage pits (groundwater quality shall be maintained consistent with this <br /> General Order). The discussion of treatment and disposal alternatives is not intended <br /> to limit the selection of alternatives available to the wastewater system designer. <br /> 6. All WDRs must implement the applicable Regional Water Quality Control Board's <br /> (Regional Water Board's) Water Quality Control Plan (Basin Plan) for the region in <br /> which the discharge occurs; therefore this General Order requires Dischargers to <br /> comply with all applicable Basin Plan requirements, including any prohibitions and/or <br /> water quality objectives, governing the discharge. The Discharger must comply with <br /> any more stringent standards in the applicable Basin Plan. In the event of a conflict <br /> between the requirements of this General Order and the Basin Plan, the more <br /> stringent requirement prevails. <br /> 7. This General Order allows the production and use of recycled water (as defined in <br /> Water Code section 13050(n)) and requires all recycled water use to comply with the <br /> applicable requirements described in California Code of Regulations, title 22, division <br /> 4, chapter 3, (hereafter title 22). Compliance with title 22 water recycling criteria and <br /> title 17 sanitation requirements shall be determined by the State Water Board Division <br /> of Drinking Water (DDW) (formerly California Department of Public Health), which <br /> reviews title 22 Engineering Reports. This General Order also allows for the <br /> application of treated wastewater to land that does not meet the definition of beneficial <br /> use, and is therefore not subject to the title 22 requirements. <br /> 8. Wastewater and treated wastewater quality vary depending upon source water quality, <br /> the activities generating the wastewater, water conservation efforts, inflow and <br /> infiltration (1/1), and treatment technology. Typical domestic wastewater and treated <br /> wastewater characteristics are presented in Table 1. Published wastewater textbooks <br /> and/or United States Environmental Protection Agency (USEPA) wastewater <br /> publications may also be used to characterize wastewater characteristics. <br /> Table 1: Summary of Domestic Wastewater Characteristics <br /> Typical Septic Septic Secondary Equivalent to <br /> Constituent Unitsa Domestic Tank Tank Treatment Secondary <br /> Wastewater Influent Effluent Effluent Treatment Effluent <br /> Biochemical mg/L 200-290b 155-286 ° 140-200d 30-45 e 65 percent <br /> Oxygen Demand reduction ` <br /> Total Suspended mg/L 200-290 b 155-330 ° 50-100 d 30-45 e p <br /> Solids <br /> Ammonia as N m /L 6-18 4-13 ° --9,0 <br /> --g'h -- 9° °' <br /> Total Nitrogen m /L 35-100 26-75 ° 40-100 50% m 43-80% <br /> September 23, 2014 <br />