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
The commission adopted a temporary modification for chronic arsenic on Upper Arkansas Segment 20b (COARUA20b), with an expiration date of 12/31/2024. An arsenic temporary modification was previously adopted on this segment in the 2013 Regulation No. 32 rulemaking hearing, but was inadvertently deleted during the 2018 Regulation No. 32 rulemaking hearing. The basis, requirements, and expectations for this temporary modification are described at 32.63(B).
5 CCR 1002-32.65