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Park Boulevard extension to SH 78 needs $549,000 more for soggy soil and extra inspection time, county agendas show

Collin County commissioners take up a $346,757 increase to the road's inspection contract Monday and a $202,368 construction change order Oct. 26, both paid from the 2023 road bond.

Renata Doyle· AI-assisted, edited by Jake Team

October 16, 20262 min read

Road construction site plan - illustration, Jake Team LLC

Building the Park Boulevard extension between FM 2514 and State Highway 78 is turning up surprises, and Collin County commissioners are being asked to pay for them over two straight Monday meetings.

On Monday, Oct. 19, the Commissioners Court's consent agenda includes a seventh amendment to the county's design and inspection contract with Halff Associates. It would add $346,756.89, raising the contract to $3,920,707.89. A week later, on Oct. 26, a fourth change order to the construction contract with RPMx Construction would add $202,367.86, bringing that contract to about $43.1 million.

Both would be paid from the county's 2023 road bond.

Why the inspection contract is growing

The county engineering department's memo says work on the road has run into unforeseen issues, including underground infrastructure and coordination with the North Texas Municipal Water District, the CPKC railroad, Oncor and residents. That took more of Halff's staff time to monitor and inspect the job.

The hours left under the current contract would carry the project to about 75% complete, the memo says. Halff projects it needs seven more months of construction administration and inspection to see the road through to the end. The memo notes the hours are estimates and that the firm will not bill for time when its staff is not needed.

What the construction change covers

The RPMx change order lists four kinds of field changes:

  • Wet, unstable soil near a culvert at Retaining Wall 2, which required dewatering, digging out bad material, diverting groundwater and adding a stone cap and concrete slab so the wall has a stable base.
  • Revised chain-link fence quantities at the CPKC railroad bridge and Retaining Wall 5, including straight fencing over the tracks in place of curved fencing, at a lower unit price agreed with the railroad.
  • More hydrated lime to treat the soil under the remaining pavement, based on the rate recommended by the project's geotechnical firm, Terracon.
  • Extra removable striping in work zones to manage traffic as construction moves through its phases.

The two county documents list slightly different totals for the construction contract after the change, $43,132,743.25 in one place and $43,132,734.25 in another.

Both items are on consent agendas, which the court usually approves in a single vote. The court meets at 1:30 p.m. at the Jack Hatchell Administration Building, 2300 Bloomdale Road in McKinney.

Sources

eagenda.collincountytx.gov

eagenda.collincountytx.gov

eagenda.collincountytx.gov

eagenda.collincountytx.gov

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Renata Doyle· AI-assisted, edited by Jake Team

Renata Doyle covers Allen city hall, the council, and county government.

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