1. (1) All water purveyors within the external critical water supply service area boundaries (with the exception of the systems specifically exempted in WAC 248-56-710(1)) shall be notified and asked to participate in the development of the supplementary provisions.

2. (2) The supplementary provisions shall address areawide water system concerns relating to the entire critical water supply service area. The content of the supplementary provisions shall comply with guidelines* which may be obtained from the department.

   1. (a) Assessment of related, adopted plans,
   2. (b) Identification of future service areas and service area agreements (WAC 248-56-730),
   3. (c) Minimum areawide water system design standards, including fireflow performance standards,
   4. (d) Procedures for authorizing new water systems in the critical water supply service area,

   5. (e) Assessment of potential joint-use or shared water system facilities and/or management programs.

      *	Copies of DSHS guidelines entitled, "Plan contents guidelines" may be obtained without charge from the Department of Social and Health Services, Water Supply and Waste Section, Mail Stop LD-11, Olympia, Washington 98504.

   The supplementary provisions shall include, but not be limited to:

[Statutory Authority: RCW 43.70.040. WSR 91-02-049 (Order 121), recodified as § 246-293-240, filed 12/27/90, effective 1/31/91. Statutory Authority: Chapter 70.116 RCW. WSR 78-07-048 (Order 1309), § 248-56-720, filed 6/28/78.]