13.25.047 Low impact development – Optional.
(1) Projects that propose the following low impact development BMPs shall be subject to the design deviation process in accordance with CMC 13.25.050. Any approved design deviation for the following shall be designed in accordance with the adopted stormwater manuals:
(a) Minimally invasive stormwater BMPs, such as, but not limited to, sediment traps, filter vaults and infiltration galleries, or other proprietary BMPs, as determined by the Director and based on a site analysis.
(b) Permeable pavements subject to vehicular use or within new or existing right-of-way.
(c) Vegetated roofs.
(d) Minimal excavation foundation systems.
(e) Roof rainwater collection systems that are within the minimum designation established by Washington State Department of Ecology.
(2) The City may require a three-year financial guarantee for performance for the use of optional low impact development stormwater facilities. The financial guarantee shall be posted in accordance with Chapter 14.105 CMC. This does not preclude the City from requiring the standard two-year maintenance financial guarantee in addition to the required performance financial guarantee.
(3) The City may require a maintenance program for the use of optional low impact development stormwater facilities that addresses the following:
(a) How all of the elements of the LID system will be maintained.
(b) The schedule for ongoing maintenance of all LID project facilities.
(c) The responsible party for ongoing maintenance of all LID project facilities. (Ord. 26-16 § 7)