All mass load limitations are again rounded to two significant figures, consistent with the number of significant figures associated with flow measurements with this facility, and with the accuracy of BOD measurements of 10 or greater. Quality-Based Effluent Limits Once TBELs and applicable basin standards have been established for the treatment facility, WQBELs must be developed. DEQ has developed several tools for calculating WQBELs. The table below provides a summary of these tools. Table 17: Summary of Tools to Calculate WQBELs Link to Parameter Analytical Application Tool/Description BOD For new dischargers. Use to perform For a dischargers analysis seeking a to see if mass load discharge will increase. result in a DO sag and/or violation of DO standard. pH For facilities Use to perform that have a a Reasonable mixing Potential zone, to see Analysis to see if basin if the discharge standards has a reasonable will be met potential to at the edge cause or of the contribute to mixing violations of zone. basin standards of pH.
All mass load limitations are again rounded to two significant figures, consistent with the number of significant figures associated with flow measurements with this facility, and with the accuracy of BOD measurements of 10 or greater. Quality-Based Effluent Limits Once TBELs and applicable basin standards have been established for the treatment facility, WQBELs must be developed. DEQ has developed several tools for calculating WQBELs. The table below provides a summary of these tools. Table 17: Summary of Tools to Calculate WQBELs Parameter Link to Analytical Tool/Description Application BOD Use to perform a analysis to see if discharge will result in a DO sag and/or violation of DO standard. For new dischargers. For dischargers seeking a mass load increase. pH Use to perform a Reasonable Potential Analysis to see if the discharge has a reasonable potential to cause or contribute to violations of basin standards of pH. For facilities that have a mixing zone, to see if basin standards will be met at the edge of the mixing zone.