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Asbestos in Soil
Greg HoltStapleton Redevelopment Program
City and County of DenverOctober 3, 2008
Stapleton Redevelopment
• Stapleton Airport closed in 1995• Largest Brownfield Urban Project• 4000 Acres
2900 acres Developable1100 acres Open Space
• Redevelopment began in 1998• Three programs:
EnvironmentalDemolitionAirfield Pavement Removal
Development
• Land Transfer Environmental Standards– Stapleton Numeric Criteria-SNC
• City, EPA and State of Colorado
– Certification from Property Owner– NFA/NAD for Environmental Sites
• Approximately 120 NFA’s received
• Master Developer Chosen
Asbestos
Under Regulation 8
• 125 Building abated prior to demolition
• 50% of the Fuel Distribution System
• Utilities:
Water
Electric
Communication/ Telephone
Asbestos in Soil
• Lowery and Buckley
• Regulation Change - May 2006
• Land Transfer Requirements
• Industry Changes– Environmental Site Assessments– Sophistication of Asbestos Abatement
Contractors– Close out reports / NFA Requests
Highline Canal Phase 1 Filing 16
History
• City Purchased the land for airport expansion mid 1950’s
• Lateral of the Highline canal
• Canal backfilled with mixed waste
• Overall site was backfilled for runway expansion-mid 1960’s
Filing 16 Timeline
• Environmental Assessments- 6/04 and 1/05• Site Characterization- Summer 2005• Work Plan Approved by CDPHE - Fall 2005• Insurance Acceptance of Claim Fall 2005• Project Bid - November 2005• Contractor Selected - January 2006• NTP – March 2006• Abatement – April 2006- Current
Filing 16 2006
Filing 16 - 2008
Filing 16 Timeline
• Work Plan Approved by CDPHE - Fall 2005
• Joint meeting with CDPHE - March 2006
• Original Work Plan amended 3 times
• Development of site wide work plan
• Creation of Clearance Protocol -Fall 2006
• Suspension of Work Plan- October 2008
Filing 16
• Original Scope of Work– Est. 120,000 yds
• 70,000 yds Non- Friable ACM• 50,000 yds Friable ACM• Area approximately 40 acres• Duration 180 days
• Actual – Est. 730,000 yds
• 480,000 yds Non- Friable ACM• 250,000 yds Friable ACM• Area increased to 105 acres• Duration 29 months
Filing 16
Filing 16
Filing 16
Filing 16
Filing 16
Filing 16
Filing 16
Filing 16
Suspension of Work• Why?
• City reached Sitewide Cap on costs
• Insurance reimbursement – Slow in payments– Payments in arrears.
Filing 16
Suspension of Work
Site Status• Canal Cleared
• 88% of the total site has been cleared
• 15% of the site has been backfilled
• Remaining area is under a stockpile.
Filing 16
Suspension of Work• Site Security
• Site Stabilization
• Protection of Human Health and Environment
• Air Monitoring
Filing 16
Insurance Reimbursement
• Original Scope of Work
$7,000,000.00
• Estimate to Completion
$50,000,000.00
Stapleton
Asbestos• One site complete - closure report and
NFA submitted
• Two sites complete –awaiting submittal
• Two sites in progress
• Five sites not started
Stapleton
Lessons learned• Site size-
• Unit pricing• Type of equipment to be used• Wetting methods
• Material –• Friable• Non-Friable• Mixture
• Mechanical means• Use of excavators, graders, other heavy equipment
• Soil preparation• Methods to achieve “adequately wet”
Stapleton
Questions