Water: Total Maximum Daily Loads (303d)
Appendix E - Mathematical Model Support
The TMDL Process
The Center for Exposure Assessment Modeling (CEAM) was established in July, 1987 to meet the water quality and exposure modeling needs of States and EPA program and Regional offices. CEAM provides exposure assessment technology, training, and consultation for analysts and decisions-makers operating under various legislative mandates, including the Clean Water Act.
With support and resources from the Monitoring Branch in the Assessment and Watershed Protection Division, Office of Water Regulations and Standards, CEAM maintains a distribution center for water quality models and databases for the user community. Users are kept up to date through user group meetings, a newsletter, and an electronic bulletin board. For the major wasteload allocations models, CEAM offers 2- to 5-day training courses at EPA Headquarters, Regional sites, and the Athens Environmental Research Laboratory facility. Longer-term "on-the-job" training at CEAM for individuals is also available. Technical assistance and review are provided by CEAM scientists and engineers, as well as by affiliated academics and consultants. Exposure calculations and assessments for especially difficult or unusual discharge situations can be arranged as resources allow.
The center currently distributes 21 simulation models and databases. These can be applied to urban runoff (SWMM4, HSPF9), leaching and runoff from soils (PRZM, HSPF9), transport through soil and ground water (MULTIMED, RUSTIC), conventional pollution of streams (QUAL2E, HSPF9, WASP4), toxic pollution of streams (HSPF9, WASP4, EXAMS2, DYNTOX), toxic pollution of lakes and estuaries (WASP4, EXAMS2), conventional pollution of lakes and estuaries (WASP4), near-field mixing and dilution in rivers, lakes, estuaries, and oceans (CORMIX1), cohesive sediment transport (SED2D-V), river and tidal hydrodynamics (DYNHYD5, HYDRO2D-V, HYDRO3D), geochemical equilibrium (MINTEQA3), and aquatic food chain bioaccumulation (FGETS). Software and databases distributed to aid in data analysis include ANNIE-IDE, DBAPE, and the CLC Database. Currently available models are summarized below. Those with no version number are available as test code, and will be routinely distributed when fully tested.
|Table E-1 CEAM Supported Models|
|Model Name||Version No.|
Center for Exposure Assessment Modeling
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Athens, GA 30613