United States Department of Transportation
i
Performance testing of coagulants to reduce stormwater runoff turbidity.
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2014-05-01
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[PDF-1.57 MB]
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Abstract:On December 1, 2009, the US Environmental Protection Agency (EPA) published a rule in the Federal
Register establishing non-numeric and, for the first time, numeric effluent limitation guidelines (ELGs). The
numeric ELGs included a turbidity limit of 280 nephelometric turbidity units (NTU) and sampling
requirements for stormwater discharges from construction sites that disturb 20 or more acres of land at one
time. At that time, the EPA required Texas to implement these new requirements when the Texas
Commission on Environmental Quality (TCEQ) renewed their Texas Construction General Permit (CGP) in
2013. Due to litigation regarding the initial numeric ELG implementation, the EPA put numeric ELGs on
hold in 2011 and on April 13, 2013, proposed to withdraw the numeric ELG as a requirement.
This project was initiated in 2010 to prepare the Texas Department of Transportation (TxDOT) for changes
to the CGP regarding the monitoring and sampling of their construction site to meet the anticipated numeric
ELG requirements. The scope of the project was modified due to EPA’s actions. However, in light of
anticipated future numeric limits, the project’s monitoring and testing experiments proceeded to 1) determine
“typical turbidity” representative of TxDOT’s construction site discharges, 2) collect performance data on
innovative erosion and sediment control measures that might be expected to achieve the discharge standard,
and 3) provide update to TxDOT’s Stormwater Managements Guidelines for Construction Activities.
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