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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

Asbestos in Soil

Greg Holt

Stapleton Redevelopment Program

City and County of Denver

October 3, 2008

stapleton redevelopment
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

development
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
Asbestos

Under Regulation 8

  • 125 Building abated prior to demolition
  • 50% of the Fuel Distribution System
  • Utilities:

Water

Electric

Communication/ Telephone

asbestos in soil5
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
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
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 timeline10
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
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 1619
Filing 16

Suspension of Work

  • Why?
  • City reached Sitewide Cap on costs
  • Insurance reimbursement
    • Slow in payments
    • Payments in arrears.
filing 1620
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 1621
Filing 16

Suspension of Work

  • Site Security
  • Site Stabilization
  • Protection of Human Health and Environment
  • Air Monitoring
filing 1622
Filing 16

Insurance Reimbursement

  • Original Scope of Work

$7,000,000.00

  • Estimate to Completion

$50,000,000.00

stapleton
Stapleton

Asbestos

  • One site complete - closure report and NFA submitted
  • Two sites complete –awaiting submittal
  • Two sites in progress
  • Five sites not started
stapleton24
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”
stapleton25
Stapleton

Questions