FM 646 Reconstruction

Galveston County/TxDOT | Santa Fe, Texas

Binkley & Barfield | DCCM provided engineering and construction management services to reconstruct and upgrade existing FM 646 from FM 1764 to SH 6 for Galveston County and the TxDOT in Santa Fe. The project included widening FM 646 from an existing two-lane asphalt roadway with open roadside ditches to a proposed four-lane concrete roadway with two-way left-turn lanes and storm sewer. The project also involved grading, lime-treated subgrade, Portland cement-treated base, bond breaker, continuously reinforced concrete pavement, inlets and storm sewer, outfall channel, drainage structures, signing, pavement markings, traffic signals, traffic control plan, and a stormwater pollution prevention plan.

The roadway improvements required purchasing an additional 20 feet of right-of-way. This project also included a realignment of the roadway so that TxDOT design criteria were met, allowing a new 150-foot prestressed slab beam bridge to be constructed over Highlands Bayou. Binkley & Barfield | DCCM refined the roadway profile to not only meet the TxDOT design criteria but also to minimize the need for construction easements during construction, which ultimately reduced the overall cost of the project.

The bridge design included four lanes, a raised sidewalk, and a combination rail on the outside. The bridge foundation design was performed using the Client Assistance 18 program. The realignment also required that Binkley & Barfield | DCCM retain a portion of the existing roadway in place to maintain access to city streets and businesses. Signal design included modification to the signal at the FM 1764 intersection and modification to the signals at 6th Street and SH 6. The signal at SH 6 required coordination with Union Pacific Railroad due to its proximity to their railroad crossing, which ensured that all railroad crossing preemption measures would remain functional.

Binkley & Barfield | DCCM also provided construction management services, utility coordination, and relocation for several utility companies, including AT&T, Comcast, CenterPoint Energy gas, and Phonoscope. We delivered weekly utility relocation updates for the contractor and TxDOT to facilitate and adhere to the project construction schedule. Our team was also entrusted by TxDOT to review and approve permit applications for proposed relocation for the entire project.

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