Westchester County is taking bids September 16 on one of the larger mechanical packages in the region this season: rehabilitation of the primary sludge gravity thickeners at the Yonkers Joint Water Resource Recovery Facility, with new bar screens and the mechanical, structural, electrical, instrumentation and HVAC work that comes with opening up a working treatment plant. The county's own bulletin puts the estimate at $11.5 million to $12.5 million, with 1,044 calendar days to complete — a three-year residency inside an operating plant on the Yonkers waterfront.

Here is the fact that decides whether this listing is an opportunity or a spectator sport: the pre-bid site inspection on August 25 was mandatory, and the county states flatly that bids will be rejected from contractors who did not attend and sign the attendance sheet. The field closed a week ago. The September 16 opening at the county office building in White Plains is a contest among a known, finite set of firms.

For those firms, the terms are heavyweight: a project labor agreement with the Westchester-Putnam building trades, a 25 percent bid bond — five times the municipal norm — full bonds, state contractor-registry registration, and the county's MWBE and service-disabled-veteran participation questionnaires in the bid package. Hazen and Sawyer engineered it.

For everyone else, the lesson is the one this desk keeps printing: on public work in this county, the walk-through is the gate. A $12 million contract's real deadline was a Tuesday morning in August, three weeks before bid day. The firms that treat pre-bid calendars as seriously as bid calendars are the ones standing in the room when the envelopes open.