Headworks Biofilter Structure

The District is adding a biofilter to remove both H2S and odors from its headworks building and its wet well chambers. The District is desirous of entering into an Agreement with a concrete contractor for the construction of the headworks biofilter structure. This project is to include the supply, placement, and tying of rebar curtains and matts, matt clearance supports, curtain spacers, and form clearance spacers, any epoxying rebar into concrete, forming, all supporting and bracing of forms, framing around the inlet supply sleeve, and placement of the concrete, concrete pumping, and any chemical curing additives required due to outside temperature at time of pouring. Concrete shall have a minimum 28 day compression strength of 4000 psi, rebar shall have a minimum yield strength of 11,780 lbs/sq inch, and splicing shall have a length of 15”, all embedments shall be 6” deep as per Hilti specification table for rebar in concrete, epoxied with Hilti HIT-RE 500 V3.

Division 03 -

Concrete, Cast-in-Place Concrete.