Material Contribution to the Condition SB325 Rulemaking Stakeholder Meeting February 23, 2016.

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Presentation transcript:

Material Contribution to the Condition SB325 Rulemaking Stakeholder Meeting February 23, 2016

State regulation for natural conditions. (1) The department may not apply a standard to a water body for water quality that is more stringent than the nonanthropogenic condition of the water body. For the parameters for which the applicable standards are more stringent than the nonanthropogenic condition, the standard is the nonanthropogenic condition of the parameter in the water body. The department shall implement the standard in a manner that provides for the water quality standards for downstream waters to be attained and maintained.

(2)(a) For water bodies where the standard is more stringent than the condition of the water body but subsection (1) is not applicable, the board shall adopt rules consistent with comparable federal rules and guidelines providing criteria and procedures for the department to issue variances from standards if: (i) the condition cannot reasonably be expected to be remediated during the permit term for which the application for variance has been received; and (i) the condition cannot reasonably be expected to be remediated during the permit term for which the application for variance has been received; and (ii) the discharge to which the variance applies would not materially contribute to the condition. (ii) the discharge to which the variance applies would not materially contribute to the condition. (b) A variance issued pursuant to subsection (2)(a) must be reviewed every 5 years and may be modified or terminated as a result of the review. (b) A variance issued pursuant to subsection (2)(a) must be reviewed every 5 years and may be modified or terminated as a result of the review.

Standard =25 mg/L. Water quality = 50 mg/L in headwaters due to abandoned mining operations

Point source near headwaters. Point source is meeting the WQ standard (25 mg/L) even though background conc. is 50 mg/L

Point source near headwaters. Point source is meeting the background conc. of 50 mg/L 15 additional river kms exceed standards

 If the discharger only meets background WQ (50 mg/L), no variance would be granted (there is material contribution to the problem)  WQ standards exceeded for 15 more kilometers (9.3 miles)  As a result, discharger would:  (A) need to meet the standard, or  (B) discharge at an intermediate concentration (25-49 mg/L) where standards exceedence remain limited to the confluence with tributary 4  If B, then variance may be justified (next slide….)

What if trib 4 had huge volume, such that is could dilute almost any arriving concentration down to standards? then… There may exist an increase above background in the already-affected reach that is also “materially contributing” to the problem, even though there is no increase in effected stream length

The issue pertains to the magnitude of the increase above background in the already-impacted zone (km )….