Contract Value:
$29 million

Project Duration:
2000-2004

Parsons Services:
Excavation and disposal of contaminated soils; handling and disposal of asbestos contaminated materials;
relocation of
in-service utilities

Excavation of haul road in Concourse D

Parsons is providing lump-sum turnkey remediation services on these sites requiring excavation and disposal of approximately 2 million cubic yards of contaminated soils. Parsons is also providing proper removal, transportation, handling, and disposal of asbestos-wrapped pipe encountered during soil remediation. Meanwhile, development has already begun on parcels of land that are confirmed clean.

Seven sites were included in the original contract, and additional sites have been added since. Parsons has guaranteed the regulatory acceptance of each contaminated site within the Stapleton property by removing the contamination. Acceptable remediation of each site is defined by the following two criteria:

Excavation of fuel pipelines

A field technique that has proven successful in expediting the job involves using a rapid total petroleum hydrocarbon (TPH) screening method to guide field decisions. To date, more than 1,000 samples have been analyzed for TPH using a commercially available screening test. The screening method can be completed in less than 30 minutes, costs 70 percent less than laboratory TPH analyses, and is providing real-time feedback on the extent and depths of soil impacted by past fuel spills. During remediation excavation, the screening method guides confirmation-sampling locations for laboratory analysis. More recently, Parsons has augmented the TPH screening technology with infrared (IR) spectral analysis. This technique also leads to good guidance screening within about 30 minutes. This information enables Parsons to make confident decisions on whether to continue excavating or take confirmation samples for laboratory analysis to demonstrate clean closure.

By identifying efficiencies in the scheduling process, Parsons is on track to cut the estimated cleanup duration in half, from 3 years to just 18 months. Much of the savings came from integrating Parsons' construction engineers and operators into the design team, which helped ensure the adequacy of the remedial design and its ability to be completed on schedule and within budget.

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