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STATE WATER RESOURCES CONTROL BOARD -3- <br /> ORDER <br /> 3- <br /> ORDER WQ 2014-0153-DWQ <br /> GENERAL WASTE DISCHARGE REQUIREMENTS <br /> FOR SMALL DOMESTIC WASTEWATER TREATMENT SYSTEMS <br /> Typical Septic Septic Secondary Equivalent to <br /> Constituent Unitsa Domestic Tank Tank Treatment Secondary <br /> Wastewater Influent Effluent Effluent Treatment Effluent <br /> Nitrite and Nitrate mg/L <1 b <1 ° _g,o _g,h -- g,h,i <br /> as N <br /> Total Phosphorus mg/L 6-12 b 6-12 0 5-15 d 51% m 50% <br /> as P <br /> a. mg/L denotes milligrams per liter. <br /> b. Data from Table 4-3, USEPA Wastewater Treatment/Disposal for Small Communities, Manual, <br /> September 1992, EPA/625/R-92/005. <br /> c Data from Table 3-7, USEPA Onsite Wastewater Treatment System Manual, June 2005, EPA/625/R- <br /> 00/008. <br /> d. Data from Table 3-19, USEPA Onsite Wastewater Treatment Systems Manual, June 2005, EPA/625/R- <br /> 00/008. <br /> e' Data from Exhibit 5-6, USEPA NPDES Permit Writers' Manual, December 1996, EPA-833-B-96-003. <br /> f. Data from Section 5.2.2, USEPA NPDES Permit Writers' Manual, December 1996, EPA-833-B-96-003. <br /> 9 "--"denotes data not available. <br /> h. Value highly variable depending upon treatment technology. <br /> No technology based limit established by USEPA. <br /> k. Percent reduction from influent, wastewater pond treatment. USEPA webpage <http://www.epa.gov/ <br /> caddis/ssr_urb ww1.html>, accessed August 29, 2014. <br /> m' Percent reduction from influent wastewater, activated sludge treatment. USEPA webpage <br /> <http://www.epa.gov/caddis/ssr_urb_ww1.html>, accessed August 29, 2014. <br /> °, Insignificant change expected in treatment. <br /> P TSS limit not appropriate for land discharge. <br /> 9. Discharges from RV holding tanks or portable toilets may contain chemicals that can <br /> pollute groundwater quality. Some commercially available products used to control <br /> holding tank/portable toilet odors may contain harmful chemicals such as <br /> formaldehyde, zinc, or phenol. The harmful chemicals can kill the bacteria in the <br /> wastewater treatment system and cause wastewater to be inadequately treated. <br /> Inadequately treated wastewater may cause additional problems such as leachfield/ <br /> seepage pit failure, surfacing wastewater, and potential exposure and health risks. <br /> Discharge of the harmful chemicals to groundwater that creates pollution may result in <br /> enforcement activities requiring groundwater remediation. The best and least <br /> expensive method to prevent groundwater pollution is to not use harmful chemicals by <br /> educating RV owners about the pollution hazard. <br /> 10. Total dissolved solids (TDS) consists of both volatile (organic) and fixed (inorganic) <br /> fractions. A varying concentration of volatile dissolved solids will exist in wastewater <br /> effluent depending upon the wastewater source and treatment technology. Ina <br /> properly operated land application system, volatile dissolved solids in percolate are <br /> generally reduced to negligible concentrations (less than 2 mg/L) by filtration and <br /> biological degradation following percolation through five feet of soil.' However, fixed <br /> USEPA, Process Design Manual, Land Treatment of Municipal Wastewater, Section 4.2.1, 1981. <br /> September 23, 2014 <br />