5 Colo. Code Regs. § 1002-41.19
The provisions of section 25-8-202(1)(a), (b) and (2); 25-8-203; and 25-8-204; C.R.S., provide the specific statutory authority for adoption. The Commission also adopted, in compliance with section 24-4-103(4) C.R.S., the following statement of basis and purpose.
BASIS AND PURPOSE:
This hearing was held to consider changes recommended in the triennial review informational hearing for the ground water standards and classifications regulations "The Basic Standards for Ground Water" 3.11.0, and "The Classifications and Water Quality Standards for Ground Water" 3.12.0. With a few exceptions, the majority of the changes proposed were of a "housekeeping" nature aimed at improving the clarity, organization, and useability of both sets of regulations.
The Commission has moved the statewide interim narrative standard for ground water from 3.12.0 to 3.11.0. This was done to consolidate all statewide standards in the basic standards regulation. This action was warranted due to the Commission's action, in December, 1994 to apply the interim narrative standard to all ground waters of the state. Note that the Statements of Basis and Purpose for the original adoption of the interim narrative standard and for applying it statewide are located in 3.12.11 and 3.12.13.
Changes to the Table 1 values for asbestos, barium, chromium and selenium were adopted for both 3.11.0 and 3.12.0 to reflect the current domestic use values found in the Colorado Primary Drinking Water Regulations . This change was particularly important for selenium as background levels in many areas of the state exceed the previous table value of 0.01 mg/l. Six changes were made to Table A in order to make these values reflect maximum contaminant levels (MCLs) found in the Safe Drinking Water Act, or the 10 -6 risk levels reported in EPA's IRIS System.
PARTIES TO THE RULEMAKING HEARING
5 CCR 1002-41.19