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RECORD NUMBER: 11 OF 16

OLS Field Name OLS Field Data
Main Title TMDLs for Copper and Zinc for the Caddo River Basin, Arkansas. (HUC-reach 08040102-016, -018, -019, and -023).
CORP Author Tetra Tech, Inc., Fairfax, VA.; Environmental Protection Agency, Dallas, TX. Region VI.
Year Published 2008
Report Number EPA/CN-68-C-02-108
Stock Number PB2013-100761
Additional Subjects Water quality standards ; Water pollution ; Dissolved oxygen ; River basins ; Arkansas ; Clean water act ; Copper ; Nonpoint sources ; Point sources ; State regulations ; US EPA ; Wasteload allocations ; Water resources ; Zinc ; Total maximum daily loads(TMDLs) ; Caddo River Basin
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB2013-100761 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 07/24/2013
Collation 79p
Abstract
Section 303(d) of the Clean Water Act and the U.S. Environmental Protection Agency's (EPA) Water Quality Planning and Management Regulations (at Title 40 of the Code of Federal Regulations (CFR) Part 130) require states to develop Total Maximum Daily Loads (TMDLs) for impaired waterbodies. A TMDL establishes the amount of a pollutant that a waterbody can assimilate without exceeding its water quality standard for that pollutant. TMDLs provide the scientific basis for a state to establish water quality-based controls to reduce pollution from both point and nonpoint sources to restore and maintain the quality of the state's water resources (USEPA 1991). A TMDL for a given pollutant and waterbody is composed of the sum of individual wasteload allocations (WLAs) for point sources and load allocations (LAs) for nonpoint sources and natural background levels. In addition, the TMDL must include an implicit or explicit margin of safety (MOS) to account for the lack of knowledge concerning the relationship between pollutant loads and the water quality of the receiving waterbody.