Pursuant of continual growth at DIA, this $20.5 million project expanded the Concourse A East Apron to provide more area in order to stage and deice aircraft, added nine general parking spaces three of which are designated wide body overnight parking areas. Expansion also allowed the extension of taxiway K to the A Concourse allowing group V aircraft access to the East side of Concourse A. Designed in 7 milestones, the main project scope included 95,000 sy of 17" PCCP placed over 20" cement treated subgrade and cement treated base course, over 100,000 sy of bond breaker fabric, the milling and asphalt overlay of the Vehicle Service Road (VSR), pavement marking, electrical, including 110 taxiway centerline and edge lights, adjustment of over 11 drainage structures to final paving grades, 18 new structures installed along with 5276 lf of drainage pipe and 1035 lf of trench drain, 19 acres of seeding, and concrete barrier wall.
The project bid in March of 2009, and notice to proceed was issued in early June. From the onset issues with environmental and the borrow site for embankment export and import contributed to the delay in the start of work activities. After several weeks it was determined that all existing embankment material was unsuitable and the balance of the dirt required, needed to be imported from a borrow site several miles from the project site. Some "Creative" Project Milestone boundary relocation and careful coordination with the designer allowed for the ability to expand the working areas of several of the milestones with significant time constraints. This process was critical in offsetting the added time required for dirt activities allowing for paving operations to begin as previously scheduled.
Along with significantly higher than normal precipitation in the spring of 2009, several existing underground utilities posed challenges during construction. Two separate Mega-Volt electrical duct banks and a 4 inch non encased natural gas line were discovered to be too shallow to provide adequate protection during pavement operations. Further challenging was crossing of these utilities during the placement of new concrete drainage pipe required to tie in a Sand, Oil and water separator. Careful excavation and encasement in flowfill of these utilities provided the structural support necessary to complete the pavement section as designed. All utility adjustment work was coordinated and performed without affecting any of the end users of any of the existing utility services.
The job site was surrounded by three live taxiways and the main vehicle service road supporting daily flight operations at Denver International Airport. The delivery and placement of concrete required the crossing of two active taxiways, making it essential that detailed coordination amongst Airport Operations, Airport Security, Traffic Control and IHC paving crews took place in order to ensure safe airport operations.
The project was divided into six distinct and separate milestones to minimize the effect of construction activities on the operation of the airport. Each milestone involved close coordination with the airlines and the DIA Airport Operations department to close each affected taxiway, complete all construction activity and reopen to aircraft within the allotted milestone time frame.
The increase in passenger traffic at Denver International Airport continued throughout 2010. Consistent growth over the first half of 2010 brought the year-to-date passenger traffic for July 2010 to 30,227,037, an increase of 780,141 passengers, or 2.6 percent, over the same seven-month period in 2009. July 2009 was DIA's busiest month on record with 5,109,342 passengers traveling through last year.