The Dyersville City Council approved two six-figure change order increases for a pair of construction projects during its July 20 meeting.
For the Southeast Pumping Station project, while digging a trench to set the stage for boring pipe under Hwy 136, crews discovered unfavorable soil composition, which has resulted in the project needing to be placed deeper in the ground.
“We’re going to need to lower that crossing by five feet so we can get bore across in solid rock,” Marc Ruden, project engineer said. “With that being said, we’re going to have to use the alternate bid numbers for the boring and that will be a substantial order.”
However, this discovery was anticipated.
“As part of the engineering estimate, we anticipated there might be some rock in that area, we just didn’t know to what magnitude,” City Administrator Mick Michel said.
Michel explained the $58,160 change order the council approved was only for the set-up costs, it does not include the additional boring fee.
Ruden said the total estimated increase will be approximately $372,000, but that is still within the council’s original budget for the project.
“Our engineering estimate was $2.22 million and the city had budgeted for that,” Ruden said. “The contractor had come in at $1.83 million so when you add this rock in there, you still end up a little under what the city had budgeted for. We were hoping we could avoid the rock but that wasn’t the case, so this is what we have to deal with.”
On the other side of town, the council has approved upgrading to a 12-inch water main as part of the X49 project.
“Right now, that area is being underserved with the six-inch water main, and the city’s long-term plan is to complete a 12-inch loop from that intersection down to 12th Avenue SW,” Michel said.
The project will also aid future economic development in the area and satisfy some of the suggestions of a hydraulic study the council had completed in 2018.
Given that there are already crews and equipment in the area, Michel said there will be some cost savings on the project. “The City Council felt that instead of going back and disturbing the neighbor’s driveway at a later date, it was more cost effective to do a portion of that project now instead of going back to do it in two-to-five years.”
While the project hasn’t been bid yet, Michel said given some of the earlier estimate of $130,000 they received, it could be covered by bond proceeds.