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Site Report: NPS Denali Nat'l Park HQ Bldg. 51

Site Name: NPS Denali Nat'l Park HQ Bldg. 51
Address: Headquarters Building 51, Denali National Park, Denali Park, AK 99755
File Number: 220.38.006
Hazard ID: 3818
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 63.720315
Longitude: -148.962356
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

A 2,000-gallon heating oil tank was removed and DRO contamination was found. Soil was removed as close to the foundation as possible and to 13 feet where contamination was greatest. DRO levels of 481 ppm remained next to the foundation and 5890 ppm was left at the bottom of the excavation. The sidewalls were below cleanup levels. Groundwater monitoring results for this site are currently being reported with those for Building 54 (220.38.003).

Action Information

Action Date Action Description DEC Staff
12/18/2001 Update or Other Action Underground storage tank closure report received. Combined with report for buildings #21 and #111. Jeff Conn
5/23/2002 Update or Other Action Site Investigation workplan received. Jeff Conn
6/7/2002 Site Characterization Workplan Approved Combined with Headquarters Powerplant Work Plan. Jeff Conn
12/5/2002 Site Added to Database Heating oil. Jeff Conn
4/29/2003 Meeting or Teleconference Held Met with NPS staff to discuss Summer 2003 actions. Larry Johnson
6/6/2003 Site Characterization Workplan Approved Approved workplan for groundwater well installation and monitoring. Larry Johnson
8/20/2004 Update or Other Action Groundwater monitoring report approved. Anne Marie Palmieri
1/26/2005 Site Ranked Using the AHRM Site reranked based on current information. Anne Marie Palmieri
1/26/2005 Update or Other Action Groundwater monitoring report reviewed and approved. Comments sent to National Park Service. DRO contamination found in MW4 at 1.8 mg/L. Anne Marie Palmieri
10/5/2005 Update or Other Action Groundwater monitoring report reviewed and approved. Contamination still present in MW-4 at 6.4 mg/l DRO and free product in MW-1 and MW-2. Need for future actions will be discussed with NPS. Anne Marie Palmieri
6/20/2008 Update or Other Action Workplan approved for groundwater monitoring. Janice Wiegers
6/25/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Janice Wiegers
5/26/2009 Update or Other Action Workplan approved for groundwater monitoring at Building 51 and Building 54 Melody Debenham
11/18/2009 Update or Other Action Received groundwater monitoring report for Building 51 and Building 54 Melody Debenham
5/13/2010 Site Characterization Workplan Approved Approved the final Headquarters Buildings 51 and 54 2010 Groundwater Monitoring Work Plan. Ongoing investigation and monitoring activities proposed in this work plan include groundwater sampling and conducting a preliminary assessment of vapor intrusion potential at Building 51. Melody Debenham
12/20/2010 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 74793 heating oil spills. Melody Debenham
3/24/2011 Site Characterization Report Approved Approved the 2010 groundwater monitoring report for Buildings 51 and 54. Groundwater results show DRO in MW-1 at 4.17 mg/L and MW-2 at 2.24 mg/L. DRO results at MW-4 and MW-5 are below the cleanup level. The preliminary vapor intrusion assessment indicates a very low potential for vapor intrusion at Building 51. Melody Debenham
3/24/2011 Conceptual Site Model Submitted The 2010 groundwater monitoring report for Buildings 51 and 54 included a conceptual site model. Melody Debenham
5/23/2012 Site Visit Performed a site visit at the C-Camp Auto Shop site and the C Camp Emergency Services/Fire Management Building site in Denali National Park & Preserve. National Park Service (NPS) staff gave us a tour of the C-Camp sites, sites in the Headquarters area and the Hotel Powerhouse site. At the C-Camp site we observed drilling and soil sampling for the installation of a monitoring well. Melody Debenham
6/25/2014 Document, Report, or Work plan Review - other Approved letter work plan to decommission monitoring wells MW-1 thru MW-9 in the Denali Headquarters area. Melody Debenham
9/2/2014 Document, Report, or Work plan Review - other Approved letter report documenting decommissioning MW-1 thru MW-9 at the Building 51, Building 54, and Building 111 headquarters sites. MW-3 could not be located for decommissioning. MW-3 is assumed to be under 3 feet of fill at the RV pad that was constructed in 2009. Melody Debenham
9/30/2014 Potentially Responsible Party/State Interest Letter Potentially responsible party letter sent to the National Park Service. Melody Debenham
8/31/2017 Institutional Control Record Established Institutional Controls established and entered into the database. Gretchen Caudill
8/31/2017 Cleanup Complete Determination Issued Gretchen Caudill
5/30/2018 Institutional Control Compliance Review IC compliance review conducted. Staff changed from Gretchen Caudill to IC Unit. Closure/IC Details updated to reflect the 2017 Decision Document. Reminder system set to follow-up every three years. Kristin Thompson
8/13/2024 Institutional Control Compliance Review IC compliance review completed on this date. An IC reminder letter was e-mailed to the landowner. The next review will be in five years’ time. Gaige Robinson

Contaminant Information

Name Level Description Media Comments
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Soil samples from the floor of the UST excavation had a maximum concentration of 5,890 mg/kg.
DRO < Table C Groundwater DRO at the source area well (MW-4) had a final concentration of 528 mg/kg. Monitoring wells adjacent to Building 54 ranged 1,180-2,240 mg/kg in 2010.

Control Type

Type Details
Federal or State Agency GIS Database Note Identification of the location of remaining soil and groundwater 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. Standard condition.
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) Standard condition.
Excavation / Soil Movement Restrictions A requirement that proper field screening and characterization be conducted during any soil excavation, digging, or trenching in the areas where residual soil contamination exists and that any contaminated soil encountered be managed in accordance with regulations applicable at that time.
Groundwater Use Restrictions A restriction on installing groundwater wells or using groundwater from the site without prior DEC approval.
Other Standard condition.
Hazard ID Site Name File Number
1604 NPS Denali Nat'l Park HQ Boiler Bldg 54 220.38.003

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
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