(a) Guam EPA, upon identifying a contaminant in a public water system that may present an unacceptable health risk to the public, may establish interim action levels for contaminants for
which maximum contamination levels have not been established by the USEPA. Guam EPA may utilize federal drinking water guidelines as well as guidelines issued by other states as interim action levels when appropriate.

(b) Guam EPA shall establish an interim action level at a level below which risks have been determined by the Guam EPA to be acceptable. Risk assessment guidelines produced by the USEPA as well as other states may be utilized to determine health risks from a chemical contaminant. When establishing an interim action level Guam EPA shall also consider water treatment or alternate remedial actions.

(c) The adoption or modification of an interim action level must be approved by the Guam EPA Board in a public meeting, only after the completion of all of the following requirements:

(1) Guam EPA shall make available to the public for review and comment a draft risk assessment document describing the technical and scientific methods and parameters utilized to determine the interim action level. The draft risk assessment may reference risk assessments, drinking water health advisories, or similar scientific documentation issued by the USEPA or other states, when appropriate.

(2) Guam EPA shall hold a public hearing for the consideration, adoption, or modification to an interim action level. Notice of a public hearing shall indicate the time, date, and place for such hearing and shall be published at least once a week for two (2) consecutive weeks in a newspaper of general circulation, with the final notice being published at least seven (7) days prior to the date of the proposed hearing. The notice must state the availability and location of the draft risk assessment document.

3) Guam EPA shall consider all comments received relating to the risk assessment and revise an interim action level if necessary. All comments received by the Guam EPA shall be made available to the public for review.

(d) The Guam EPA, upon designating an interim actionlevel for a contaminant, shall take such actions necessary to protect the health of the public including, but not limited to, requiring Public Water Systems to:

(1) issue guidance as may be necessary to protect the health of persons (including travelers) who are or may be users of a contaminated water supply system; and

(2) notify the public through the media of the establishment of an interim action level.