Asbestos in Soil

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 NFAs 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
  1950s
• Lateral of the Highline canal
• Canal backfilled with mixed waste
• Overall site was backfilled for runway
  expansion-mid 1960s

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
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Filing 16
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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