Improving the EPA Multi-Sector General Permit for Industrial Stormwater Discharges (2019) / Chapter Skim
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Appendix E: Additional Data on Technical Achievability of Treatment Stormwater Control Measures
Appendix E: Additional Data on Technical Achievability of Treatment Stormwater Control Measures
Pages 137-148
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From page 137... ...
Seven studies were of devices was considered for inclusion in the graphical analysis whose primary treatment mechanism was sedimenta- was tested statistically using the nonparametric analyses tion, while six studies primarily relied on filtration for available in SigmaPlot/SigmaStat (Systat Software, water quality treatment, and two were treatment trains Inc.)
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From page 138... ...
For the Total Copper hard-water benchmark, the dry detention pond and media filter could meet the hard-water benchmark for The copper benchmark is hardness dependent; between 50 and 75 percent of the monitored storm therefore, two sample benchmarks are shown in Fig- events, while the wet retention pond and bioretention ures E-3 and E-4 for the evaluation of technology system met the hard-water benchmark for between 75 performance at individual industrial storm ater study w and 90 percent of the monitored storm events. FIGURE E-1 Total aluminum influent versus effluent concentrations.
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From page 139... ...
FIGURE E-3 Total copper influent versus effluent concentrations compared to the soft-water benchmark concentration of 9 µ/L. NOTES: DP = dry retention pond; HDS = hydrodynamic separator; MF = media filter; TT = treatment train.
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From page 140... ...
The number of storm-event samples used in each analysis is shown on the graph below each treatment system. FIGURE E-5 International Stormwater BMP Database comparison of influent and effluent concentrations for total copper against the soft-water benchmark of 9 µg/L.
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From page 141... ...
The improved performance when only industrial stormwater sites, only one treatment train analyzing data where the influent exceeds the hard- had effluent concentrations that consistently met the water benchmark likely is due to the strong association soft-water benchmark of 80 μg/L (>90 percent of the of high concentrations of lead with particulate mat- monitored storm events; see Figure E-11)
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From page 142... ...
The number of storm-event samples used in each analysis is shown on the graph below each treatment system. FIGURE E-8 Total lead influent versus effluent concentrations comparison against the hard-water benchmark.
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From page 143... ...
FIGURE E-10 International Stormwater BMP Database comparison of influent and effluent concentrations for total lead compared to the soft-water benchmark. NOTE: RP = wet retention ponds.
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From page 144... ...
The number of storm-event samples used in each analysis is shown on the graph below each treatment system. FIGURE E-12 Total zinc influent versus effluent concentrations comparison to the hard-water benchmark.
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From page 145... ...
FIGURE E-13 International Stormwater BMP Database comparison of influent and effluent concentrations for total zinc compared to the soft-water benchmark. NOTE: BR = bioretention; DP = dry detention ponds; MF = media filters; RP = wet retention ponds; WB = wetlands.
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From page 146... ...
FIGURE E-15 Chemical oxygen demand influent versus effluent concentrations. NOTES: HDS = hydrodynamic separator; MF = media filter; TT = treatment train.
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From page 147... ...
APPENDIX E 147 FIGURE E-16 International Stormwater BMP Database comparison of influent and effluent concentrations for chemical oxygen demand. NOTE: BR = bioretention; DP = dry detention ponds; MF = media filters; RP = wet retention ponds; WB = wetlands.
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