The Department of Agriculture amended 8 Colo. Code Regs. §1203.8, Rules and Regulations Pertaining to the Administration and Enforcement of the Colorado Chemigation Act. Among other changes, the department repealed laboratory test criteria for pipeline check valves and certain construction and testing requirements for chemical injection lines. http://www.sos.state.co.us/CCR/Upload/NoticeOfRulemaking/ProposedRuleAttach2011-00122.RTF.