Medium and Large MS4 regulated entities have stormwater permit requirements to monitor stormwater during wet weather (rainfall) events. NCTCOG is assisting local entities through a cooperative regional monitoring program designed to meet these requirements. The regional program includes the cities of Dallas, Fort Worth, Arlington, Garland, Irving, Plano, Mesquite; the local districts of the Texas Department of Transportation (TxDOT); and the North Texas Tollway Authority (NTTA).
The stormwater program during the first permit term (1996 - 2001) was designed to capture runoff data from smaller, single land use watersheds. While the analysis of these samples indicated the typical runoff characteristics of each specific land use, the data did not evaluate the impacts on receiving streams. The primary goal of the second permit term (2006 - 2010) was to determine long-term trends and assess the impact of stormwater discharge on receiving stream quality. This data will also serve as a baseline for future analysis. The participating entities are in a third permit term (2011 - 2016) to continue the assessment of urban impact on receiving stream water quality and to document any improvement from best management practice implementation.
Third Permit Term (2011 - 2016)
Through an RFP process, Atkins (in association with Freese & Nichols; Dougherty, Sprague Environmental Inc.; and TTI Environmental Laboratories) was awarded a contract to assist the smaller entities of Arlington, Garland, Irving, Plano, Mesquite, TxDOT-Dallas, and NTTA with equipment monitoring and deployment, field trip preparation, chemical sample retrieval, and post-sampling activities. Atkins is also assisting the cities of Garland and Plano with biological monitoring. Dallas and Fort Worth continue to use their own staff to conduct chemical and biological monitoring. The regional monitoring plan calls to chemically monitor 24 watersheds and perform rapid bioassessments within 12 watersheds across the region, with substantial overlap between the two sampling approaches. Most entities are chemically sampling one watershed in their jurisdiction for two consecutive years beginning January 1, 2012 and then moving to a second watershed for another two years. For more information about the third regional monitoring permit term, click here.
Second Permit Term (2006 - 2010)
Through an RFP process, PBS&J (in association with Freese and Nichols; Arredondo, Zepeda and Brunz; and TTI Environmental Laboratories) were awarded a contract to assist the smaller entities of Arlington, Garland, Irving, Plano, Mesquite, TxDOT-Dallas and NTTA with field collection and analysis of stormwater samples during this second five-year permit term. Dallas and Fort Worth used their own staff to collect samples. The regional monitoring plan called for
the quarterly sampling of up to three monitoring stations in each
of the nine watersheds per year for three years beginning January
1, 2007. For
more information about the second regional monitoring permit term, click here.
First Permit Term (1996 - 2001)
During the first permit term, seven municipalities (Dallas, Fort Worth, Arlington, Irving, Garland, Plano, and Mesquite) and two local districts of TxDOT received joint approval from the U.S. Environmental Protection Agency (EPA) for a regional monitoring program which utilized the assistance of a shared consultant team and the United States Geological Survey (USGS) to sample and analyze 22 outfalls primarily from small watersheds of a predominantly single land use type. For more information about the first regional monitoring permit term, click here.
Papers and Presentations
Watershed Management: The Metroplex Connection (September 2011 issue of TexasWET)
Balancing Compliance with Science