(1) For each category of expenditure that is expected to produce verifiable reductions in greenhouse gas emissions or other long-term impact(s) to emissions, ecology will, in consultation with the recipient, either:

(a) Identify the appropriate California air resources board methodology and calculator tool for use in calculating the projected quantity of reduced greenhouse gas emissions, and adapt the inputs used in the methodology and calculator tool as needed to be appropriate for use in Washington;

(b) Adapt a California air resources board methodology and calculator tool to make it appropriate;

(c) Develop an appropriate methodology; or

(d) Locate a methodology from another source that is of the same or better quality than methods provided by the California air resources board.

(2) Ecology will approve methodologies and calculator tools and post them on its website for use by recipients for the purposes described in this section.

(3) If a recipient expects their expenditure(s) will produce a verifiable reduction in greenhouse gas emissions or other long-term impact to emissions, but ecology has not approved a methodology and calculator tool for an applicable expenditure category, the recipient must notify ecology.