Oregon Administrative Rules › Chapter 340 - DEPARTMENT OF ENVIRONMENTAL QUALITY › Division 42 - TOTAL MAXIMUM DAILY LOADS (TMDLS) › Section 340-042-0030 - Definitions

Current through Register Vol. 63, No. 7, July 1, 2024
In addition to the definitions provided in ORS
				468.005,
				468B.005,
				OAR 340-041-0002  and 340-045-0010, unless otherwise required by context, the
				following definitions apply to OAR 340-042.
(1) "Background Sources" include all sources
			 of pollution or pollutants not originating from human activities. In the
			 context of a TMDL, background sources may also include anthropogenic sources of
			 a pollutant that DEQ or another Oregon state agency does not have authority to
			 regulate, such as pollutants emanating from another state, tribal lands or
			 sources otherwise beyond the jurisdiction of the state.
(2) "Designated Management Agency (DMA)"
			 means a federal, state or local governmental agency that has legal authority
			 over a sector or source contributing pollutants, and is identified as such by
			 the Department of Environmental Quality in a TMDL.
(3) "Director" means the Director of the
			 Department of Environmental Quality or the Director's authorized
			 designee.
(4) "Hydrologic Unit Code
			 (HUC)" means a multi-scale numeric code used by the U.S. Geological Survey to
			 classify major areas of surface drainage in the United States. The code
			 includes fields for geographic regions, geographic subregions, major river
			 basins and subbasins. The third field of the code generally corresponds to the
			 major river basins named in OAR 340, division 41. The fourth field generally
			 corresponds to the subbasins typically addressed in TMDLs.
(5) "Local Advisory Group" means a group of
			 people with experience and interest in a specific watershed or subbasin that is
			 designated by DEQ to provide local input during TMDL development.
(6) "Management Strategies" means measures to
			 control the addition of pollutants to waters of the state and includes
			 application of pollutant control practices, technologies, processes, siting
			 criteria, operating methods, best management practices or other
			 alternatives.
(7) "Performance
			 Monitoring" means monitoring implementation of management strategies, including
			 sector-specific and source-specific implementation plans, and resulting water
			 quality changes.
(8) "Pollutant"
			 has the meaning provided in the Federal Water Pollution Control Act Section 502
			 (33
			 USC Section 1362).
(9) "Reasonable Assurance" means a
			 demonstration that a TMDL will be implemented by federal, state or local
			 governments or individuals through regulatory or voluntary actions including
			 management strategies or other controls.
(10) "Sector" means a category or group of
			 similar nonpoint source activities such as forestry, agriculture, recreation,
			 urban development or mining.
(11)
			 "Sector-Specific Implementation Plan" or "Source-Specific Implementation Plan"
			 in the context of a TMDL means a plan for implementing a Water Quality
			 Management Plan for a specific sector or source not subject to permit
			 requirements in ORS
			 486.050. The elements of
			 an implementation plan are described in OAR 340-042-0080.
(12) "Source" means any process, practice,
			 activity or resulting condition that causes or may cause pollution or the
			 introduction of pollutants to a waterbody.
(13) "Subbasin" means the designation in the
			 fourth field of the U.S. Geological Survey Hydrologic Unit Code.
(14) "Surrogate Measures" means substitute
			 methods or parameters used in a TMDL to represent pollutants.
(15) "Total Maximum Daily Load (TMDL)" means
			 a written quantitative plan and analysis for attaining and maintaining water
			 quality standards and includes the elements described in OAR 340-042-0040.
			 These elements include a daily load calculation of the maximum amount of a
			 pollutant that a waterbody can receive and still meet state water quality
			 standards, allocations of portions of that amount to the pollutant sources or
			 sectors, and a Water Quality Management Plan to achieve water quality
			 standards.
(16) "Waterbody" means
			 any surface waters of the state.
(17) "Water Quality Management Plan (WQMP)"
			 means the element of a TMDL describing strategies to achieve allocations
			 identified in the TMDL to attain water quality standards. The elements of a
			 WQMP are described in OAR 340-042-0040(4)(l).
Publications: Publications referenced are available from the
				  agency.
Statutory/Other Authority: ORS
				  468.020,
				  468B.020,
				  468B.030,
				  468B.035  & 468B.110
Statutes/Other Implemented: ORS
				  468B.020  & 468B.110