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 Three programs: Environmental Demolition Airfield 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 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 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

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

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, 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