Blog - Latest News
You are here: Home

Scottsdale – McKellips Park Lake Dam Rehabilitation

22 Oct 2013/0 Comments/in /by

City of Scottsdale, Scottsdale, AZ – As part of Scottsdale’s Indian Bend Wash stormwater system, DBA was contracted by Sundt Construction as a key subcontractor to perform earthwork and structures for the replacement of the earthen dam at McKellips Park Lake.

DBA’s scope of work included:

  • Sawcut and remove dam cap
  • Drain the lake
  • Remove unsuitable, saturated material from lake bed
  • Remove grouted rip-rap at the dam on the upstream side
  • Excavate 18” of material at the dam below the existing rip-rap
  • Import new bedding material for the lake liner (3,360 SY)
  • Install 40 mil PVC non-woven geotextile fabric for lake liner (37,000 SF)
  • Placed 4” thick shotcrete on the liner
  • Install temporary fencing with access gates, signage and barricades along the multi-use path
  • Remove and replace the multi-use path around the lake (3,000 SF)
  • Install 3’ wide grouted-rock maintenance accessway at the top of the dam

The project was contracted through the City of Scottsdale but required strict adherence to Flood Control District of Maricopa County regulations and permits for work within an active flood zone.  The project started in early January and was fully complete in 30 days. Early in the project’s schedule, a large winter storm hit Scottsdale hard on January 7th with 3/4” of rain in one day on the upstream side of the dam.  The project team had to quickly mobilize and get personnel and equipment out of the wash before the flood waters arrived.

Gila Valley Irrigation District – Fort Thomas Canal Repair

22 Oct 2013/0 Comments/in /by

Gila Valley Irrigation District, Safford, AZ –  DBA was contracted directly by the Gila Valley Irrigation District to complete concrete canal repairs and replace existing concrete irrigation structures that were undersized for their flow capacity.  DBA’s scope of work included:

  • Diversion of water from the irrigation canal
  • Dewatering the construction site
  • Demolition of existing radial canal headgate structure
  • Forming and constructing a new concrete headwall structure
  • Installation of new steel radial gates
  • Placement of 100 CY of grouted rip-rap
  • Placement of newly reinforced concrete gate structure

Due to the requirements of the irrigation district, very tight tolerances were specified and properly inspected for the concrete mix.

Site earthwork was also included in DBA’s contract in the way of final grading to adjust the existing levees and return the site to its original condition.  It was determined early on in the contract, that much of the existing material on-site was considered to be unstable.  DBA was contracted to remove the unsuitable material and replace it.

ADOT – Airport Entrance Road Improvements

22 Oct 2013/0 Comments/in /by

Grand Canyon Airport, Tusuyan, Arizona – The improvements for this project included the construction of a new entrance road from the highway into the airport property.  Approximately 1,380 SY of PCCP at 8.5” thick was used for this roadway improvement at one of the busiest airports in the U.S.  DBA’s scope of work also included the removal and replacement of concrete curb and gutter, valley gutters, and 32 concrete pads were included for the vertical adjustment of valves.

This FAA AIP-funded project required a FOD secured worksite.  Sweepers were utilized every work day and special construction site fencing was placed directly around each work site to prevent FOD issues.

 

Gila Bend Municipal Airport – Airfield Improvements

22 Oct 2013/0 Comments/in /by

Gila Bend Municipal Airport, Arizona  – DBA’s scope of work included:

  • Sawcutting, mill and removal of existing AC and PCC pavements (approximately 18,600 SY)
  • Removal of existing tie-down anchors
  • Subgrade preparation
  • Shoulder grading
  • Placement and recompaction of aggregate base course
  • Placement of new asphaltic concrete and 5” thick Portland cement concrete paving (approximately 557 CY)
  • New tie-down anchors

The project also called for the construction of a raised, reinforced, concrete fuel island including concrete encased 2” diameter PVC ductwork for electrical distribution service, and new electrical pull boxes to service the new fuel pumps. Sustainable efforts were employed for the project by salvaging and rubbelizing the old AC pavement to be reused for the new aggregate base course.

The project was funded through the FAA using AIP funds and the lead designer was Gannett Fleming.

Coolidge Municipal Airport – Aircraft Parking Apron Rehabilitation

22 Oct 2013/0 Comments/in /by

Coolidge Municipal Airport, AZ – The project scope included the removal and replacement of 7,400 SY of PCCP, removal and replacement of unstable subgrade, joint sawing and sealing, spall repairs, and striping.  All work was completed with minimal impact to daily air traffic, fueling, Marine Corps sky diving training operations and monthly fly-in events.

As the project’s general contractor, DBA proposed a construction sequencing plan that allowed the airport to maintain normal airfield operations.  A low slump concrete mix was submitted and approved that would achieve full design strength in seven days.  All new concrete was then placed back in service in just one week, instead of during the initially planned four-week shutdown.  These factors allowed for all PCCP placement to be done in a total of six weeks.

Unique Innovations: The issue of maintaining a level grade prior to the placement of PCCP was a project challenge due in part to replacing sections in an alternating sequence.  DBA shop-fabricated a leveling/grading beam and attached it to the Gannon tractor, supplying an efficient way to grade a narrow stretch of taxiway and apron subgrade.

ADOT Breakaway Cable Terminal Replacements Ph 1 & 2

28 Jul 2013/0 Comments/in /by

Statewide, AZ – Phase 1 replacements were completed along Interstate 10, Interstate 17, US-60, Arizona State Routes 101, 202, 143, and 87 for a total of 109 individual locations/work sites in Maricopa County.  Phase 2 included the replacement at 33 separate work sites.
DBA’s scope of work included:

  • Demolition of the existing BCT’s and their concrete foundations
  • Removal of the demolished materials to a salvage yard
  • Surveying
  • Soil compaction
  • Placement of aggregate base course
  • Construction of the new Impact Attenuators
  • Placement of new guardrail, concrete curb & gutter
  • PCCP placement and asphaltic concrete friction course
  • Electrical
  • Signage & striping
  • Landscaping

The DBA Team developed a work sequencing plan at various sites that allowed the project to complete 39 days ahead of the original schedule.

DBA Construction, Inc.

Since 1996, DBA has successfully completed heavy civil projects in markets across the southwest. DBA's expertise is diverse and includes Airports & Airfields, Power Generation & Transmission, Irrigation & Flood Control, Mining & Industrial and Municipal and Governmental markets. The use of innovative solutions to construction challenges and DBA's commitment to exceeding client expectations is demonstrated in our client's continued trust in us.
© Copyright - DBA Construction, Inc. - Website by Mission Critical