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ansion: Convenient and Economical


Parking Study For a better understanding of EppleyAirfield’s overall park-


ing needs, as well as the opportunities afforded to the airport by the area’s economic growth, consultants analyzed the relationship between parking demand and enplanement statistics to ensure that customers were receiving optimal service. For coordinated planning, the parking and the airside terminal study were con- ducted simultaneously. By reviewing current parking/rental car data and the oper-


ating conditions of the airport parking system, key parking parameters were identified to benchmark: parking revenue per parker, parking revenue per enplanement, and parking demand ratio per 1,000 enplanements. Rental car facilities housed with- in a parking structure contribute approximately 25% to total parking revenue. Recognizing that a parking structure expansionwould have


to allow for consolidation and expansion of current terminal facilities without duplication, several parking structure options were studied, including multiple plan locations, building heights, construction phasing, building materials, amenities, code implications, cost estimates and schedules. Once all of the data had been accumulated, the airport


authority’s review of the findings confirmed project directives. A plan of action to pursue a parking structure addition moved froma planning concept to a credible business proposal andwas submitted for review by the authority’s Board of Directors. Twelve expansion concepts were presented for airport staff


consideration with the following evaluation criteria: • Impact on roadway traffic flow (long range) • Impact on airport landside operations • Project aesthetics • Convenience – vehicle flow to / fromnew parking • Convenience – pedestrian flow to / fromnew parking • Constructability • Disruption to parking / rental car operations • Parking cost / added parking space


Parking Structure Expansion The final approved expansion concept provided the largest


parking area build-out possible within the existing site parame- ters.As the airport authority did not want the parking expansion to include remote facilities, two horizontal cast-in-place post-ten- sioned concrete additions, each six stories in height, served to increase parking space. Existing pedestrian vertical circulation elements and two pedestrian bridges from level three to the ter- minal remained in place. Construction forced the closing of the previous entry


points for all patrons using long-term garage and short-term parking. Temporary entry locations, using newly purchased entry equipment, provided patron ingress fromTerminal Drive. The parking structure continued to operate during all phases of the construction. Contract documents were prepared to define construction


activity phases, limits and schedules. Construction fencing and plastic enclosureswere designed to ensure safe and effective con- struction activity and public way separation. The construction contract included liquidated damages that coordinated with the project phases.


Cost and Features The structure additions, totaling approximately 250,000


square feet, were completed for a construction cost of $9.5 mil- lion, or $13,176 per parking stall, and were in line with the origi- nal cost estimate.TheGeneralContractorwasGrahamConstruc- tion of Omaha.


Construction features worth noting include: • Deep pile foundations: 70’ - 90’ tipped steel pipe. •New construction cantilevered 14’ toward existing structure.


• CIP post-tensioned construction. • 6” slabs with 24’x60’ structural grid. • Façade constructed of unitized concrete-filled steel pans.


The construction effort was completed in 14 months and


allowed for continuous parking operations, with no more than 150 stalls displaced at any given time. The 721-stall parking expansion accommodated the airside consultants’ post-9/11 re- evaluation of expansion alternatives. Overall, the Omaha Airport Authority’s desire to provide


additional convenient parking for patrons, to improve upon the parking system performance, and to respect the long-term land- side expansion opportunities, was successfully achieved.


Scott R. Froemming, P.E., Director of Operations in the Minneapolis office of Walker Parking Consultants, can be reached at scott.froemming@walkerparking.com.


PT APRIL 2010 • PARKING TODAY • www.parkingtoday.com 15 Eppley Airfield’s garage expansion features incremental


parking system improvements; relocation of the entry parking equipment out of public viewand into awell-lighted, secure, cov- ered location; and improved vertical vehicular circulation through the modification of the long-term parker flow directly onto a one-way express ramp. In an effort to enhance public safe- ty, the short-termentry drive alsowas relocated to a spot next to a pedestrian pathway leading to the terminal.


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