Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 260 - WATER QUALITY STANDARDS › Part I - Surface Water Standards with General, Statewide Application › Section 9VAC25-260-110 - Halogen ban

Current through Register Vol. 40, No. 24, July 15, 2024
A. Chlorine or
				  other halogen compounds Bromine, bromine chloride, hypochlorite and chlorine
				  dioxide. shall not be used for disinfection purposes or other treatment
				  purposes including biocide applications for any treatment facility with a
				  permitted flow of 20,000 gallons per day or more discharging to waters
				  containing endangered or threatened species listed in subsection C of this
				  section or to waters listed as i and ii in the River Basin Section Tables,
				  9VAC25-260-390 et seq. except for
				  dischargers who intermittently chlorinate. Dischargers of less than 20,000
				  gallons per day shall dechlorinate to the requirements of the numerical
				  chlorine criteria in
				  9VAC25-260-140 B or to a
				  nondetectable chlorine residual. Dischargers who intermittently chlorinate (not
				  more than two hours in any eight-hour period) shall be required to install
				  equipment or employ procedures, or both, to ensure dechlorination to a chlorine
				  residual that meets the numerical chlorine criteria in
				  9VAC25-260-140 B, and to apply
				  effective best management practices for chlorine. Dischargers who
				  intermittently chlorinate shall, in order to address a possible malfunction of
				  the dechlorination system, either have storage sufficient to contain the
				  chlorinated water until it can be dechlorinated prior to discharge or have an
				  online redundant and operational back-up dechlorination system.
B. Variance to this requirement shall not be
				  made unless it has been affirmatively demonstrated that the existing uses of
				  the water will be maintained and that either a change is justifiable to provide
				  necessary economic or social development or the degree of waste treatment
				  necessary to preserve the existing quality cannot be economically or socially
				  justified.
C. TENNESSEE AND BIG
				  SANDY RIVER BASINS
CLINCH RIVER SUBBASIN
Powell River from river mile 136 (south of Jonesville)
					 downstream to the Tennessee/Virginia line (river mile 115.8-total 20.2
					 miles).
Endangered Species:
Appalachian monkeyface pearly mussel
Quadrula sparsa
Birdwing pearly mussel
Conradilla caelata
Cumberland monkeyface pearly mussel
Quadrula intermedia
Dromedary pearly mussel
Dromus dromas
Fine-rayed pigtoe pearly mussel
Fusconaia cuneolus
Shiny pigtoe pearly mussel
Fusconaia edgariana
Threatened Species:
Slender chub
Hybopsis cahni
Yellowfin madtom
Noturus flavipinnis
Clinch River from river mile 323 (Richlands) downstream to
					 the Tennessee/Virginia line (river mile 202.1).
Endangered Species:
Appalachian monkeyface pearly mussel
Quadrula sparsa
Birdwing pearly mussel
Conradilla caelata
Fine-rayed pigtoe pearly mussel
Fusconaia cuneolus
Green blossom pearly mussel
Dysnomia torulosa gubernaculum
Pink mucket pearly mussel
Lampsilis orbiculata
Shiny pigtoe pearly mussel
Fusconaia edgariana
Clinch River from the Scott/Russell County line (at
					 Bangor-river mile 244.2) downstream to the Tennessee boundary (river mile
					 202.1).
Threatened Species:
Slender chub
Hybopsis cahni
Copper Creek from 2 miles above its confluence with the
					 Clinch River (river mile 211.6).
Endangered Species:
Fine-rayed pigtoe pearly mussel
Fusconaia cuneolus
Shiny pigtoe pearly mussel
Fusconaia edgariana
Copper Creek from Dickensville (river mile 56) in Russell
					 County downstream to its confluence with the Clinch River.
Threatened Species:
Yellowfin madtom
Noturus flavipinnis
HOLSTON RIVER SUBBASIN
North Fork Holston River from river mile 93.3 (near
					 Broadford) downstream to the Smyth/Washington County line (river mile
					 82.1).
Endangered Species:
Shiny pigtoe pearly mussel
Fusconaia edgariana
North Fork Holston River from the Smyth/Washington County
					 line (river mile 82.1) to the Tennessee/Virginia boundary (river mile
					 5).
Threatened Species:
Spotfin chub
Hybopsis monacha
Middle Fork Holston River from river mile 43 (in Marion)
					 downstream to river mile 18.4.
Endangered Species:
Tan riffle shell mussel
Dysnomia walkeri
Middle Fork Holston River from river mile 6.5 to river mile
					 3.2 near Osceola.
Threatened Species:
Spotfin chub
Hybopsis monacha
Statutory Authority
§ 62.1-44.15(3a) of the Code of Virginia.