Asbestos in Soil

Greg HoltStapleton Redevelopment Program

City and County of DenverOctober 3, 2008

Stapleton Redevelopment

• Stapleton Airport closed in 1995• Largest Brownfield Urban Project• 4000 Acres

2900 acres Developable1100 acres Open Space

• Redevelopment began in 1998• Three programs:

EnvironmentalDemolitionAirfield 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 8

• 125 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 2006- Current

Filing 16 2006

Filing 16 - 2008

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

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Filing 16

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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

$7,000,000.00

• 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