Specifications include, but are not limited to: The Contractor shall furnish, deliver and install the GS-2023-04 REPLACEMENT OF GRANULAR ACTIVATED CARBON (GAC) AT WAILUA HOMESTEADS WELLS NO. 1 & 2. Approximately 20,000 lbs of GAC shall be supplied and installed in the two (2) pressure vessels which measure 12 feet in diameter each. The pressure vessels are manufactured by US Filter, Model HP-1220C, with a rated treatment capacity of 1,000 gpm. The GAC to be supplied and installed shall be virgin, granular and manufactured from bituminous coal. The GAC shall be acid washed and suitable for adsorption of soluble mercury from potable water. Provided GAC is for the treatment of potable water supplies and shall conform to the requirements of the most current edition of AWWA B-604. The GAC shall meet minimum standards and performance criteria regarding material specifications and physical properties. These performance criteria shall be evaluated based on lab reports that are submitted to the DOW. Failure of the samples to meet the performance criteria shall result in the rejection of the GAC.