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Site Report: NPS Denali Nat'l Park Bus Barn

Site Name: NPS Denali Nat'l Park Bus Barn
Address: MP 1.5 Denali Park Road, Denali Park, AK 99755
File Number: 220.38.042
Hazard ID: 26057
Status: Cleanup Complete - Institutional Controls
Staff: Livia Bracker, 9072697695 livia.bracker@alaska.gov
Latitude: 63.733510
Longitude: -148.920894
Horizontal Datum:WGS84

We make every effort to ensure the data presented here is accurate based on the best available information currently on file with DEC. It is therefore subject to change as new information becomes available. We recommend contacting the assigned project staff prior to making decisions based on this information.

Problems/Comments

On 9/23/11 petroleum-contaminated soil was discovered adjacent to the Denali Park bus barn during excavation and construction activities. The source of contamination was unknown. Initial remedial activites included removal of approximately 35 cubic yards of contaminated soil, temporarily stockpiled at an off-site location in Healy known as Lausen's yard. In 2013, the NPS discovered a shop floor drain had been connected to a leach field during utility upgrades in 2010-2012. The connection between the floor drain and leach filed is prohibited by the Underground Injection Well Control regulations of the Safe Drinking Water Act. The NPS has disconnected and capped the discharge line and permanently plugged the floor drain. Two soil samples were collected from the leach field to determine if the leach field was impacted by use of the floor drain. No contaminants were detected above the applicable cleanup levels. The EPA has documented the closure of this floor drain, EPA UIC ID Number AK068F5-18-13507.

Action Information

Action Date Action Description DEC Staff
5/14/2013 Spill Transferred from Prevention Preparedness and Response Program Spill transferred by PERP staff Paul Lhotka. Spill no. 11309926602; spill date = 9/23/11; substance = petroleum; quantity = unknown. Mitzi Read
5/21/2013 Site Added to Database A new site has been added to the database Mitzi Read
8/28/2013 Site Characterization Workplan Approved Approved the final Denali Bus Barn Shop Disposal Well Closure Assessment Work Plan describing assessment of the leach field near the Bus Barn. This work plan includes sampling the leach field to assess whether the leach field has been impacted by discharges from the Bus Barn floor drain. Samples will be analyzed for volatile and semi-volatile organic compounds; gasoline, diesel, and residual range organics; and metals. Melody Debenham
12/13/2013 Update or Other Action Received closure approval letter for Bus Barn floor drain from EPA. Melody Debenham
2/21/2014 Site Characterization Report Approved Approved final Denali Bus Barn Shop Disposal Well Closure Assessment Report describing site characterization activities at the leach field to determine if the leach field was impacted by use of the floor drain at the Bus Barn. The floor drain has been permanently plugged and the discharge line to the leach field has been disconnected and capped. No contaminants were detected in the soil samples from the leach field above the applicable cleanup levels. Melody Debenham
9/30/2014 Potentially Responsible Party/State Interest Letter Potentially responsible party letter sent to the National Park Service. Melody Debenham
5/16/2016 Site Characterization Workplan Approved Approved final work plan describing collection of soil samples to determine extent of remaining contamination near Bus Barn identified in 2011 during water line work. Contaminated soil was excavated and transported off-site for treatment in 2011, however no samples were collected from limits of excavation. Melody Debenham
1/3/2017 Site Characterization Report Approved Approved final report documenting soil sampling of contaminated soil identified during water line installation in 2011. No samples were collected from the excavation at the time. Sample results show DRO, xylenes, naphthalene, 1-methylnaphthalene, and 2-methylnaphthalene above the migration to groundwater cleanup levels. Remaining contamination is underneath the building to a depth of approximately 5 feet. Melody Debenham
1/31/2018 Cleanup Complete Determination Issued Gretchen Caudill
1/31/2018 Institutional Control Record Established Institutional Controls established and entered into the database. Gretchen Caudill

Contaminant Information

Name Level Description Media Comments
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Remaining concentration at 10,000 mg/kg.
Xylenes (total) Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Remaining 2.78 mg/kg.
Naphthalene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Remaining 3 mg/kg.
1-Methylnaphthalene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Remaining 14 mg/kg.
2-Methylnaphthalene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Remaining 13 mg/kg.

Control Type

Type Details
Federal or State Agency GIS Database Note Identification of the location of historical and remaining contamination on the NPS GIS database and use of the internal NPS planning process for all projects that directs the user to the GIS database to determine if contamination is present within the project area.

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.
Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70)
Groundwater Use Restrictions A restriction on installing groundwater wells or using groundwater from the site without prior DEC approval.
When Contaminated Soil is Accessible, Remediation Should Occur A requirement that proper field screening and characterization be conducted should any section of the building be removed where residual soil contamination exists and that any contaminated soil encountered be managed in accordance with regulations applicable at that time.

No associated sites were found.

Missing Location Data

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State of Alaska Department of Environmental Conservation

P.O. Box 111800
Juneau, AK 99811-1800
Phone: 907-465-5066
Fax: 907-465-5245
TDD: 800-770-8973
Physical Location: 410 Willoughby