Discussion and Consideration of Change Order #15 – Boomerang Corporation – North Park Road Improvements Project – Motion to Approve — K.4

City of Tiffin - Iowa Change Order Details 52-7662-615 Description STP-U-7662(615)--70-52, Letting Date- December 17, 2024 Prime Contractor Boomerang Corp. 13225 Circle Dr Suite A, Anamosa, IA 52205 Anamosa, IA, IA 52205 Change Order 15 Status Pending Date Created 04/23/2026 Type Non-Substantial Summary Add item for temporary pipe for flow conveyance into 72in culvert for temporary flow conveyance during S-06 installation. Change Order Description 8220: Add item for 2503-0111018 STORM SEWER GRAVITY MAIN, TRENCHED, HIGH DENSITY POLYETHYLENE PIPE (HDPE), 18 IN. Awarded Project Amount $5,458,891.91 Authorized Project Amount $5,554,449.41 Change Order Amount $1,250.00 Revised Project Amount $5,555,699.41 B-Reason for Change 8220: Add 20 LF of 18IN HDPE temporary pipe from approx. STA 222+67 to STA 222+47. This temporary pipe is intended to tie into the detention basin outlet outside of the ROW which is the primary flow inlet into the North Park Road storm system, the temporary 18in pipe will be outlet into the new 72in culvert which is already installed to send flows into the new system while construction of the structure S-06 (cast-in-place) takes place (the 72in culvert outlets from S-06). Change Order Details: 04/24/2026 52-7662-615 Page 1 of 3