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Asbestos in Soil

Asbestos in Soil. Greg Holt Stapleton Redevelopment Program City and County of Denver October 3, 2008. Stapleton Redevelopment . Stapleton Airport closed in 1995 Largest Brownfield Urban Project 4000 Acres 2900 acres Developable 1100 acres Open Space Redevelopment began in 1998

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Asbestos in Soil

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  1. Asbestos in Soil Greg Holt Stapleton Redevelopment Program City and County of Denver October 3, 2008

  2. Stapleton Redevelopment • Stapleton Airport closed in 1995 • Largest Brownfield Urban Project • 4000 Acres 2900 acres Developable 1100 acres Open Space • Redevelopment began in 1998 • Three programs: Environmental Demolition Airfield Pavement Removal

  3. 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

  4. Asbestos Under Regulation 8 • 125 Building abated prior to demolition • 50% of the Fuel Distribution System • Utilities: Water Electric Communication/ Telephone

  5. 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

  6. 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

  7. 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

  8. Filing 16 2006

  9. Filing 16 - 2008

  10. 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

  11. 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

  12. Filing 16

  13. Filing 16

  14. Filing 16

  15. Filing 16

  16. Filing 16

  17. Filing 16

  18. Filing 16

  19. Filing 16 Suspension of Work • Why? • City reached Sitewide Cap on costs • Insurance reimbursement • Slow in payments • Payments in arrears.

  20. 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.

  21. Filing 16 Suspension of Work • Site Security • Site Stabilization • Protection of Human Health and Environment • Air Monitoring

  22. Filing 16 Insurance Reimbursement • Original Scope of Work $7,000,000.00 • Estimate to Completion $50,000,000.00

  23. Stapleton Asbestos • One site complete - closure report and NFA submitted • Two sites complete –awaiting submittal • Two sites in progress • Five sites not started

  24. 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”

  25. Stapleton Questions

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