Specifications include, but are not limited to: 1. Full Re-Build or Conversion Bioretention facilities in this category have little to no vegetation, and/or limited treatment capacity due to compaction, erosion or other issues. The maintenance program will include an approach to rebuilding and/or converting these facilities sufficient to bring them into compliance with CCSM maintenance requirements and provide the county with a low-maintenance solution for future management of these facilities. Facilities in this category include the need for remove/replace of existing bioretention soils, plant material, and mulch. Proposers should include considerations and expectations for new plant establishment. Proposers are encouraged to consider the use of alternative best management practices such as BMP T5.21 Infiltration Swale from Volume V of the draft Stormwater Management Manual for Western Washington. 2. Sparse Vegetation Needs Upgrading Bioretention facilities in this category have limited vegetation insufficient to provide full ground cover, effective weed suppression, or reasonable visual appeal. The maintenance program will include an approach to rehabilitating these facilities that retains existing viable vegetation and upgrades/expands the overall amount of vegetation to enhance facility function and appearance. Proposers should include considerations and expectations for new plant establishment. 3. Well-Established/Ongoing Long-Term Maintenance Program Bioretention facilities in this category currently have sufficient, well-established vegetation and are functioning in compliance with CCSM requirements. The maintenance program will include an approach to ongoing maintenance sufficient to keep facilities in compliance with the CCSM and provide an acceptable level of aesthetic appeal for county residents.