Commission accepts Evoqua proposal for municipal odor and corrosion control

The commission approved awarding RFP 56527 for municipal corrosion and odor control services to Evoqua (the incumbent vendor). Utilities Director Anthony Henry said Evoqua was the only bidder, that the proposal includes the automated dosing equipment and remote monitoring, and described the treatment chemical (bioxide, a calcium nitrate solution) used to reduce H2S production in sewer lines. Henry said the indefinite-quantity contract rate is $5.61 per gallon and that based on prior usage this year's estimated cost is $447,562.50.

Commissioners asked about long-term fixes versus chemical treatment. Henry explained the city's sewer-lines were built with slopes that can permit solids to settle and create anoxic conditions that generate H2S; a permanent fix would require expensive replacement or regrading of lines and additional lift stations. The commission voted 7-0 to approve the contract as presented.