The project includes Construct and commission a new engineered media biofilter (biofilter). The biofilter will be a single-cell, reinforced concrete basin with integral air distribution, internal high-density polyethylene liner, engineered media, media floor support system, water panel, and humidification and irrigation system, Install and commission two new odor control fans located adjacent to the new engineered media biofilter, Modify, re-route, and provide new foul air ducting and supports within the Headworks facility to the new odor control fans and biofilter, Demolish the existing odor mist scrubber, including the existing odor exhaust fan, unused foul air duct, low-pressure air piping, and chemical piping, Install and commission two Owner-furnished variable speed drives in the upper electrical room, Install instrumentation and control stations, associated conduits, conductors, and other appurtenances necessary to complete the Work, Fill abandoned force mains below the footprint of the new biofilter with grout, Finish grading to incorporate the biofilter into the earthen bank south of Headworks, including a new concrete stairway alongside the north edge of the biofilter and a cart path extending south from the fan pad to the digester gas treatment skid, Install site lighting to illuminate access around the biofilter, odor control fans, and cart path, Install irrigation sleeves at hardscape crossings. Final landscaping and site irrigation will be by Owner, Install new drainage piping and manhole for the biofilter drain, connecting to the existing sanitary sewer line.
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