14th Street Water Treatment Plant GAC Filter Media Replacement

Key Accomplishments

• Johnston Construction Company served as the contractor for replacement of the granular activated carbon and filter sand within four filters at the 14th Street Water Treatment Plant.
• Coordinated the complete removal and replacement of filter media within four active drinking-water treatment filters.
• Removed approximately 60 inches of existing granular activated carbon and 8 inches of existing filter sand from each filter while leaving the underlying support gravel in place.
• Used a wet-removal process with vacuum-truck and eduction equipment to limit airborne carbon and sand dust within the treatment facility.
• Coordinated removal, dewatering, handling, transportation, and disposal of the spent granular activated carbon and filter sand.
• Cleaned each filter following removal of the existing media and prepared the filter beds for installation of the replacement materials.
• Supplied and installed approximately 7,520 cubic feet of granular activated carbon, weighing approximately 224,700 pounds.
• Installed Calgon Carbon Filtrasorb 816 granular activated carbon within the four filters.
• Supplied and installed approximately 1,040 cubic feet of silica filter sand beneath the replacement carbon media.
• Installed approximately 8 inches of new filter sand in each filter and completed the required media leveling and skimming.
• Installed approximately 62 inches of new granular activated carbon in each filter and completed final media-level verification.
• Coordinated third-party laboratory testing of the replacement GAC and filter sand before shipment.
• Obtained material certifications, certificates of analysis, safety data, and compliance documentation for the replacement filter media.
• Coordinated disinfection of each filter before final granular activated carbon installation and return to service.