Specifications include, but are not limited to: Maintenance at the Transfer Station will be an as needed basis and will likely include the following: 1. Maintain Catch Basins: Remove all sediment and surface debris using pressure washer and vacuum. Dispose of contaminated sediment per in accordance with all applicable local, state and federal laws and regulations. Replace any necessary supplies such as inserts, filter fabric or other protective measures that are no longer useful. 2. Inspect and maintain all Contech Media Filtration Systems (vaults) as directed with Zeolite, Perlite and Granular activated carbon (ZPG) cartridges or recommended improved option. a. Unit #1 – 13 cartridges b. Unit #2 – 4 Cartridges c. Unit #3 – 3 Cartridges d. Unit#4 – 13 Cartridges