Administrative Rules of Montana › Department 17 - ENVIRONMENTAL QUALITY › Chapter 17.30 - WATER QUALITY › Subchapter 17.30.6 - Surface Water Quality Standards and Procedures › Rule 17.30.630 - TEMPORARY WATER QUALITY STANDARDS

Current through Register Vol. 13, July 5, 2024
(1)
				Following are the temporary water quality standards and related provisions for
				New World Mining District:
(a) The goal of the
				state of Montana is to have these waters support the uses listed for waters
				classified B-1 at ARM
				17.30.623(1). The
				standards for the parameters listed in this rule temporarily modify the
				specific standards for those parameters provided in ARM
				17.30.623 for each of the water
				bodies listed below, until the temporary standards expire or are terminated by
				the department. The standards for parameters not listed in this rule are the
				specific standards listed in ARM 17.30.623. The existing uses of the water
				bodies listed below must be maintained during the period that these temporary
				standards are in effect. No increase from existing conditions for any of the
				parameters that have been temporarily modified (no decrease for pH) is allowed
				at any point in the affected stream segments. The numerical standards for
				specific parameters listed below apply only at the downstream end of the stream
				segment. The requirements of ARM 17.30.623update apply to the waters listed in
				this rule except where those requirements conflict with the temporary standards
				listed below.
(b) The temporary
				standards for these stream segments are effective June 4, 1999.
(c) Temporary water quality standards for
				Daisy Creek, from its headwaters to its confluence with the Stillwater River in
				the Yellowstone River Drainage, are as follows. No increase from existing
				conditions (no decrease for pH) is allowed at any point in Daisy Creek for any
				of the following parameters. These standards are in effect until June 4, 2019.
				Metals standards are in terms of micrograms per liter (µg/liter) total
				recoverable concentrations and pH standards are in standard units (su).
Parameter
In Daisy Creek at its confluence with
								the Stillwater River, the following standards shall not be exceeded more than
								3% of the time.
µg/liter
Aluminum
9,510.
Cadmium
4.
Copper
3,530.
Iron
6,830.
Manganese
1,710.
Zinc
540.
pH
must be maintained above 4.6 su.
(d)
				Temporary water quality standards for a headwater portion of the Stillwater
				River, a tributary of the Yellowstone River, from Daisy Creek to the
				Absaroka-Beartooth wilderness boundary, are as follows. No increase from
				existing conditions (no decrease for pH) is allowed at any point in this reach
				of the Stillwater River for any of the following parameters. These standards
				are in effect until June 4, 2019. Metals standards are in terms of micrograms
				per liter (µg/liter) total recoverable concentrations and pH standards
				are in standard units (su).
Parameter
In the Stillwater River at the
								Absaroka-Beartooth wilderness boundary, the following standards shall not be
								exceeded more than 3% of the time.
µg/liter
Aluminum
670.
Copper
200.
Iron
1,320.
Lead
13.
Manganese
86.
Zinc
49.
pH
must be maintained above 5.5 su.
(e)
				Temporary water quality standards for Fisher Creek, from its headwaters to its
				confluence with Lady of the Lake Creek, the headwaters of the Clark's Fork of
				the Yellowstone River, are as follows. No increase from existing conditions (no
				decrease for pH) is allowed at any point in Fisher Creek for any of the
				following parameters. These standards are in effect until June 4, 2019. Metals
				standards are in terms of micrograms per liter (µg/liter) total
				recoverable concentrations and pH standards are in standard units (su).
Parameter
In Fisher Creek at its confluence with
								the Lady of the Lake Creek, the following standards shall not be exceeded more
								than 3% of the time.
µg/liter
Aluminum
470.
Copper
110.
Iron
750.
Lead
2.
Manganese
82.
Zinc
44.
pH
must be maintained above 5.7 su.