(1) Inventory required. WSDOT shall prepare and maintain an inventory of all state highways in the Puget Sound basin. The purpose of the inventory is to determine where water quality BMPs need to be installed, to assist identification of priority projects, and to provide a basis for the evaluation of the program. WSDOT shall begin its inventory on highways with an ADT of fifty thousand or greater. The inventory and rating of highways with an ADT of less than fifty thousand shall be sufficient to provide projects for the six-year capital improvement program plan.

(2) Contents of inventory. The inventory shall be developed for homogeneous highway segments and shall include, but not be limited to:

(a) Highway segment identification including name, location, type, traffic volume classification, local government(s) with jurisdiction, interested tribes, and WSDOT district;

(b) Status of stormwater management as follows: (i) BMPs are present and/or a local government is receiving and/or treating the highway runoff; (ii) BMPs are feasible or the local government will receive and/or treat highway runoff; or (iii) BMPs are not practicable; and

(c) Name of any water quality project completed since the effective date of this chapter, length of project, year of construction, and cost.

(3) Priority rating and ranking.

(a) WSDOT shall establish an annual project priority list for each WSDOT district within the Puget Sound basin. For each fiscal year WSDOT shall select needed improvements for each district inventoried as required by subsection (1) of this section. WSDOT shall divide these needed improvements into projects, considering funds available but in no case less than one project per year in each district unless all needed projects are completed.

(b) Priority rating criteria. WSDOT shall develop a priority rating and ranking system and submit it to ecology for concurrence.

(c) Priority ranking. WSDOT, using the priority ratings and rankings prepared using the system required in subsection (2)(b) of this section, shall determine which projects are to be implemented in each WSDOT district during the fiscal year. WSDOT may modify this ranking for good reason including the participation in a joint project proposed by a local government or tribe.

(4) Capital improvement program plan.

(a) The capital improvement program plan is to promote efficient use of resources, to coordinate projects, to aid compliance with the long-range program targets set forth in subsection (5) of this section and to ensure that difficult projects and those that require lengthy lead time are constructed in a reasonable time.

(b) WSDOT shall prepare a biennially updated water quality capital improvement program plan. WSDOT shall consult with ecology, tribes, and local governments throughout the planning process including the inventory. The capital improvement program plan shall be for a six-year period and include the following:

(i) An inventory of potential projects for the six-year period, including fiscal, technical, work force, legislative requirements, restrictions, and an initial evaluation of their relative priority;

(ii) A schedule for potential execution of projects in a long-range program list which considers priority relationships of projects coupled with legislative, fiscal, technical, and work force restrictions;

(iii) Selection of projects for early action from this schedule; and

(iv) Formal adoption by WSDOT after public review.

(c) Ecology shall review the proposed WSDOT capital improvement program plan and submit written comments to WSDOT before public review and again before adoption by WSDOT.

(d) After a public hearing, WSDOT shall adopt the capital improvement program plan after making appropriate revisions deemed necessary by public input.

(5) Long-range program.

(a) WSDOT shall complete all practicable BMP projects or transmit highway runoff to tribes or local governments for stormwater treatment for highways with an ADT of fifty thousand and greater by December 31, 2005, and for other highways by December 31, 2015.

(b) At least every six years WSDOT and ecology shall evaluate these target dates. Ecology or WSDOT may initiate revision of the target dates. In evaluating any proposed revision of a target date, ecology and WSDOT are to consider factors including, but not limited to, the number and projected costs of the projects yet to be completed, the degree of difficulty to construct the remaining sites, the projected level of funding, any revisions to the state water quality standards and any revisions to the manual required by WAC 173-270-030(1).

(6) Negotiations. Before transmitting to or requesting treatment of highway runoff by a tribe, local government or property owner, WSDOT shall negotiate with the tribe, local government, or property owner. WSDOT shall provide relevant information that shall include, but not be limited to, existing agreements to accept highway runoff, characteristics of the highway runoff, the reasons WSDOT is not treating the runoff on its own right of way and any proposed financial considerations for quality and/or quantity control.

(7) Disposal sites. WSDOT shall prepare an inventory, by district and maintenance area, of all sites, including all known inactive sites, where WSDOT disposes highway sweepings and sediments from stormwater facilities maintenance activities. Inventory information for WSDOT owned and leased sites and sites WSDOT for which has an easement shall include a scaled map illustrating property boundaries and the extent of the fill area, and where possible, an estimate of the volume of the fill present.