5 Colo. Code Regs. § 1002-37.39
The provisions of C.R.S. 25-8-202 (1)(a), (b) and (2); 25-8-203; 25-8-204; and 25-8-402; provide the specific statutory authority for adoption of these regulatory amendments. The Commission also adopted in compliance with 24-4-103(4) C.R.S. the following statement of basis and purpose.
BASIS AND PURPOSE
Pursuant to the requirements in the Basic Standards (at 31.7(3)), the commission reviewed the status of temporary modifications sclneduled to expire before December 31, 2020 to determine winetlner the temporary modifications should be modified, eliminated, or extended.
For the temporary modifications set to expire after the effective date of this Inearing, the commission reviewed progress toward resolving the uncertainty in the underlying standard and/or the extent to which conditions are a result of natural or anthropogenic conditions, and evaluated whether the temporary modifications were still necessary. The commission took no action on the following temporary modifications:
Lower Colorado Segment 4e (COLCLC04e): temporary modification of the acute and chronic copper standards (expires 12/31/2019). Tri-State Generation and Transmission Association, Inc. continues to make progress to resolve the uncertainty and is working to develop a proposal for the June 2019 Regulation No. 37 rulemaking hearing. The commission made no change to the expiration date, as the original time allotment was deemed adequate to resolve the uncertainty.
The commission deleted the temporary modifications on the following segments:
Lower Yampa Segment 17a (C0LCLY17a): temporary modification of the chronic arsenic standard (expires 12/31/2021). The commission deleted this temporary modification because it was adopted in error. The temporary modification is more stringent than the underlying standard.
5 CCR 1002-37.39