Maximum contaminant levels for groundwater are those specified in chapter 248-54 WAC, as the primary drinking water standards. Analytical methods for these contaminants may be found in the Code of Federal Regulations, 40 C.F.R. Part 141. (These contaminant levels are to be considered interim levels for the purpose of regulating disposal facilities and must be used until the department establishes groundwater quality standards for all types of activities impacting groundwater.)