Beef Creek Streambank Stabilization
Fort Sill, Oklahoma
USACE, Tulsa District
HGL Construction was awarded this high-profile, complex design-build heavy-civil construction project under an existing $49 million Single Award Task Order Contract (SATOC) Indefinite Delivery Indefinite Quantity (IDIQ) contract with the USACE, Tulsa District. The purpose of this project was to design and construct a permanent solution to control erosion that had occurred along the west slope of Beef Creek, which is adjacent to the historically- and archeologically-significant Native American Cemetery, Apache POW Site, which is where the famous Chiricahua Apache leader, Geronimo, is buried on Fort Sill, OK. To solve this issue, HGL designed ten multi-level repair areas that consisted of 20’- to 35’-high steel H-piles that were installed within 15’ of the west bank and spaced at 6’0” on center. The piles are laid out to form a semicircle around center points. Additionally, 6”x6” pressure-treated wood timber laggings were placed between the piles to create a wall adjacent to the slope, which was then backfilled with native soil and compacted. Once complete, surge material and riprap were placed on the backside of the lower level wall to further control erosion. On top of each level, U-3 Bermuda was placed to restore the site.
The design phase consisted of 35%, 65%, 95%, 100 Pre-Final, and Issue for Construction (IFC) design packages. After each design package was developed and submitted to the USACE, a 21-day Government review period followed. Each design package consisted of drawings, specifications and a design analysis narrative. Between the 65% and 95% design development, the design underwent a Tribal Consultation Review period for 250 days. Utilizing HGL’s Integrated Design-Build Team management approach, our onsite Team was already mobilized and ready to start work immediately following the issuance of IFCs.
Through careful planning and innovative scheduling approaches, HGL completed this project 228 days ahead of schedule – 7-1/2 months early!
UNIQUE PROJECT FEATURES:
Overcame two 500-year floods in 2016
Involved working from within the bottom of the creek, with water always present
Performed work in accordance with 404 Permit requirements
Installed over 250 H-Piles measuring 20’ to 35’ tall using an 80’-high tracked crane
Coordinated with Fort Sill and Native American tribes to shut down construction during burial ceremonies
Battled heat, weather, wind, snakes, mosquitos and poison ivy
Completed project 100% safe with over 4,000 man hours
Completed the project ahead of schedule – by over 228 days, or 7-1/2 months