Site work for a water / sewer project in Tucson, Arizona. Completed plans call for site work for a water / sewer project.

Granular Activated Carbon Media Replacement Any questions regarding the RFQ or Specifications should be directed to Cameron Meyer: cmeyer@metrowater.com or (520) 209-2835 Bids Are for the Following Project: Granular Activated Carbon Media Bids Are Being Requested for the Periodic Replacement of Spent Granular Activated Carbon Media With New Granular Activated Carbon Media for Water Treatment Bids Shall Be Valid From July 1, 2025 Thru June 30, 2026 GAC Media Descriptions: A. Virgin Coconut Shell GAC Specifications: Provide virgin coconut shell granular activated carbon approved for drinking water treatment, including ANSI/NSF Standard 61 certification. The activated carbon shall conform to the following specifications: Iodine Number, mg/g 1,050 (min) Moisture by Weight 5% (max) Effective Size 0.60 - 0.85 mm Uniformity Coefficient 2.0 Hardness Number 97 Abrasion Number 85 Screen Size by Weight, US Sieve Series On 12 mesh 10% (max) Through 30 mesh 5% (max) Apparent Density (tamped) 0.47 - 0.52 g/cc Total Ash 5% (max) B. Virgin Bituminous Coal GAC Specifications: Provide virgin reagglomerated bituminous coal granular activated carbon (Calgon Carbon Filtrasorb 400M or approved equal) approved for drinking water treatment, including ANSI/NSF Standard 61 certification. The activated carbon shall conform to the following specifications: Iodine Number, mg/g 1,000 (min) Moisture by Weight 2% (max) Effective Size 0.55 - 0.75 mm Uniformity Coefficient 1.9 (max) Abrasion Number 75 (min) Trace Capacity Number mg/cc - 10 (min) Screen Size by Weight, US Sieve Series On 12 mesh 5% (max) Through 40 mesh 4% (max) Apparent Density (tamped) 0.57 g/cc Water Extracables < 1% Non-Wettable < 1% C. The delivered activated carbon must be accompanied by an analysis sheet certifying compliance with these specifications.