Download - Asbestos in Soil Greg Holt Stapleton Redevelopment Program City and County of Denver October 3, 2008
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Asbestos in Soil
Greg HoltStapleton Redevelopment Program
City and County of DenverOctober 3, 2008
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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
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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
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Asbestos
Under Regulation 8
• 125 Building abated prior to demolition
• 50% of the Fuel Distribution System
• Utilities:
Water
Electric
Communication/ Telephone
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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
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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
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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
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Filing 16 2006
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Filing 16 - 2008
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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
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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
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Filing 16
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Filing 16
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Filing 16
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Filing 16
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Filing 16
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Filing 16
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Filing 16
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Filing 16
Suspension of Work• Why?
• City reached Sitewide Cap on costs
• Insurance reimbursement – Slow in payments– Payments in arrears.
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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.
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Filing 16
Suspension of Work• Site Security
• Site Stabilization
• Protection of Human Health and Environment
• Air Monitoring
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Filing 16
Insurance Reimbursement
• Original Scope of Work
$7,000,000.00
• Estimate to Completion
$50,000,000.00
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Stapleton
Asbestos• One site complete - closure report and
NFA submitted
• Two sites complete –awaiting submittal
• Two sites in progress
• Five sites not started
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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”
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Stapleton
Questions