The City of Dubuque Water Department is requesting sealed bids for the purchase and delivery of Calcium Oxide (High Calcium Quicklime) for the remainder of FY 2027 through June 30, 2027, at which time the contract shall go to month-to-month with written agreeance from both parties until such time as the City were to re-bid.
The quicklime to be furnished under this Contract shall meet or exceed ANSI/AWWA B202-19 (herein referred to as "B202"), or the latest revisions made to this specification, unless modified herein, and shall also be in accordance with ANSI/NSF 60, unless sections common to both standards should conflict, in which case the B202 standards shall be in effect.
This product shall be suitable for use in the potable water industry in the treatment and softening of potable water.
It shall be of the best quality, shall be freshly burned, and shall be substantially free of coarse, siliceous residue, stones, carbonate solids, and any other foreign objects or matter that may interfere with the use of the lime, or the slaking of the quicklime, or cause any damages to the City of Dubuque’s (hereinafter "City") equipment or facilities.
The lime shall be classed by size known as one-half inch (1/2") with a minimal amount of dust and fine material allowed. All quicklime furnished shall be crushed and screened to be from one quarter inch (1/4”) to three quarters inch (3/4”) size. The City will verify the materials using standard sieves per B202.
The quicklime supplied under this specification shall have a guaranteed available Calcium Oxide (CaO) content greater than or equal to ninety percent (90%). The quicklime analysis supplied with the bid shall indicate the available Calcium Oxide (CaO) content.
The quicklime supplied under this specification shall be highly reactive when the “Slaking Rate Test” is performed as listed in B202. This highly reactive lime shall produce a temperature rise of not less than forty degrees centigrade (40 deg C) in three minutes (3 min.) or less. The quicklime analysis supplied with the bid shall indicate the temperature rise and the time required to attain it.
The quicklime supplied under this specification shall be freshly burnt and shall be substantially free of insoluble material. The amount of such material as determined by the “Objectionable Insoluble Matter Test” listed in B202 Section 5.5 shall not exceed 5% as stated in B202 Section
