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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

Greg Holt

Stapleton Redevelopment Program

City and County of Denver

October 3, 2008


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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


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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 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

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


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