(1) Where the existing and designated uses for the water body would be fully protected using an alternative criterion, site-specific criteria may be adopted.

(a) The site-specific criterion must be consistent with the federal regulations on protecting uses (currently 40 C.F.R. 131.11); and

(b) The decision to approve a site-specific criterion must be subject to a public involvement and intergovernmental coordination process.

(2) The site-specific analyses for the development of a new water quality criterion must be conducted in a manner that is scientifically justifiable and consistent with 40 C.F.R. 131.11; and conducted in accordance with the procedures established in the "Water Quality Standards Handbook," EPA 2023, as revised.

(3) The decision to approve the site-specific criterion must be based on a demonstration that it will protect the existing and designated uses of the water body.

(4) Site-specific criteria are not in effect until they have been incorporated into this chapter and approved by the USEPA.