Asbestos in SoilGreg HoltStapleton Redevelopment ProgramCity and County of DenverOctober 3, 2008

Stapleton Redevelopment Stapleton Airport closed in 1995Largest Brownfield Urban Project4000 Acres2900 acres Developable1100 acres Open SpaceRedevelopment began in 1998Three programs: EnvironmentalDemolitionAirfield Pavement Removal

Development

Land Transfer Environmental StandardsStapleton Numeric Criteria-SNCCity, EPA and State of ColoradoCertification from Property OwnerNFA/NAD for Environmental SitesApproximately 120 NFAs receivedMaster Developer Chosen

Asbestos Under Regulation 8125 Building abated prior to demolition50% of the Fuel Distribution System Utilities:WaterElectricCommunication/ Telephone

Asbestos in SoilLowery and BuckleyRegulation Change - May 2006Land Transfer RequirementsIndustry ChangesEnvironmental Site AssessmentsSophistication of Asbestos Abatement ContractorsClose out reports / NFA Requests

Highline Canal Phase 1 Filing 16HistoryCity Purchased the land for airport expansion mid 1950s Lateral of the Highline canal Canal backfilled with mixed wasteOverall site was backfilled for runway expansion-mid 1960s

Filing 16 TimelineEnvironmental Assessments- 6/04 and 1/05Site Characterization- Summer 2005Work Plan Approved by CDPHE - Fall 2005Insurance Acceptance of Claim Fall 2005Project Bid - November 2005Contractor Selected - January 2006NTP March 2006Abatement April 2006- Current

Filing 16 2006

Filing 16 - 2008

Filing 16 TimelineWork Plan Approved by CDPHE - Fall 2005Joint meeting with CDPHE - March 2006Original Work Plan amended 3 timesDevelopment of site wide work planCreation of Clearance Protocol -Fall 2006Suspension of Work Plan- October 2008

Filing 16Original Scope of WorkEst. 120,000 yds 70,000 yds Non- Friable ACM50,000 yds Friable ACMArea approximately 40 acresDuration 180 daysActual Est. 730,000 yds480,000 yds Non- Friable ACM250,000 yds Friable ACMArea increased to 105 acresDuration 29 months

Filing 16

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Filing 16Suspension of WorkWhy?City reached Sitewide Cap on costsInsurance reimbursement Slow in paymentsPayments in arrears.

Filing 16Suspension of WorkSite StatusCanal Cleared88% of the total site has been cleared15% of the site has been backfilledRemaining area is under a stockpile.

Filing 16Suspension of WorkSite SecuritySite StabilizationProtection of Human Health and EnvironmentAir Monitoring

Filing 16Insurance ReimbursementOriginal Scope of Work$7,000,000.00

Estimate to Completion$50,000,000.00

StapletonAsbestosOne site complete - closure report and NFA submittedTwo sites complete awaiting submittalTwo sites in progressFive sites not started

StapletonLessons learnedSite size- Unit pricingType of equipment to be usedWetting methods

Material FriableNon-FriableMixture

Mechanical meansUse of excavators, graders, other heavy equipment

Soil preparationMethods to achieve adequately wet

Stapleton

Questions