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Site Report: NPS Denali Nat'l Park HQ Boiler Bldg 54

Site Name: NPS Denali Nat'l Park HQ Boiler Bldg 54
Address: McKinley Park Road, Headquarters Boiler Plant, Denali Park, AK 99755
File Number: 220.38.003
Hazard ID: 1604
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 63.720032
Longitude: -148.961967
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

Two 10K gallon heating oil tanks failed their TTTs. The tanks were removed in 1993, at which time the primary source was reported to be leaking supply-line piping from the northern tank. 625 cubic yards of contaminated soil was removed but residual contamination was left under the generator building to the south, electric transformers to the west, and at the base of the excavation (15 to 21 ft bgs). The highest DRO concentration out of 15 soil samples was 9,600 mg/kg, at 13 ft bgs in the middle of the excavation. Six borings were installed by Hart Crowser in 2001. The DRO concentration in the middle of the excavation was 889 mg/kg at 40 ft bgs. No benzene has been detected in the soil. TEX and some PAHs have been detected but below cleanup levels. Seven wells were installed in this area between 2001 and 2003. MW-1 and MW-2 had 0.09 and 0.02 feet of product in them in 2003. NPS installed a petrotrap to remove product from MW-1 in the fall of 2003. Product has not been seen since 2003. Site has also been called "Pumphouse", "Powerhouse", and "Bldg. 54". This site is sometime confused with the Hotel Oil Spill (220.38.001). Building 51 (220.38.006) is located near this site and groundwater monitoring results are currently being reported for Building 51 and Buildng 54 together.

Action Information

Action Date Action Description DEC Staff
9/30/1992 Interim Removal Action Approved 8,000 gallons of fuel will be moved to temporary storage. Remaining 12,000 gallons will be consumed prior to 11/30/92. Former Staff
10/20/1992 Update or Other Action (Old R:Base Action Code = NOR - Notice of Release Letter (LUST)). Sent NOR letter to Denali National Park after ADEC informed of Failed TTT. Don Gibler
10/29/1992 Site Added to Database Heating oil. Former Staff
3/19/1993 Update or Other Action (Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Gave verbal approval to Joe Durrenberger at 11:55 AM this date. Kalu Kalu
2/14/1994 Update or Other Action (Old R:Base Action Code = RPL2 - Site Information Request Letter). Sent PRP-CS Database Notification Letter to RP requesting update and more environmental information concerning the contaminated site. RP responded with completed information form. Jeff Peterson
10/5/1994 Site Ranked Using the AHRM Initial ranking. Former Staff
8/24/2001 Update or Other Action Work plan for site investigation received. Jeff Conn
1/2/2002 Update or Other Action Site Assessment received. Jeff Conn
5/23/2002 Update or Other Action Site Assessment workplan received. Jeff Conn
6/7/2002 Site Characterization Workplan Approved Jeff Conn
4/29/2003 Meeting or Teleconference Held Met with NPS staff to discuss Summer 2003 actions. Larry Johnson
6/6/2003 Long Term Monitoring Established Long-term monitoring begins. 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 Update or Other Action Groundwater monitoring report approved. Free product recovery continues in MW1 and MW2. Staff sent comments to NPS staff regarding report and continued monitoring efforts. Anne Marie Palmieri
1/26/2005 Site Ranked Using the AHRM Site reranked based upon more complete information. 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 Exposure Tracking Model Ranking Initial ranking with ETM completed. Janice Wiegers
8/18/2008 Update or Other Action Received Building 51/54 Groundwater Monitoring 2008 Report Melody Debenham
5/26/2009 Update or Other Action Approved work plan for groundwater monitoring at Building 54 and Building 51 Melody Debenham
8/19/2009 Spill Transferred from Prevention Preparedness and Response Program Spill transfered by PERP staff Wesley Ghormley. Spill no. 07309921304; spill date 8/1/07; PERP file no. 220.02.001; substance = diesel; quantity = ~20 gallons; source description: 100-gallon heating oil tank. On August 1, 2007 a 100 gallon HOT was being loaded onto a truck with a forklift when it fell releasing ~20 gallons of diesel onto the ground. The report stated that the forklift operator assumed the tank was empty. Tammy Scholton, environmental staff with the National Park Service, reported that this site has been previously listed as a contaminated site with ADEC. Wes Ghormley and John Ebel with ADEC PERP visited the site on May 13, 2008 to investigate and document the spill. A final report was presented to ADEC along with an approval to transport request. Thirty tons of contaminated soil were transported to OIT for thermal remediation on 09/13/2008. Mitzi Read
11/18/2009 Update or Other Action Received groundwater monitoring report for Building 54 and Building 51 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 72582 Heating oil spills from underground tanks. 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. 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 Cleanup Complete Determination Issued Gretchen Caudill
8/31/2017 Institutional Control Record Established Institutional Controls established and entered into the database. 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

Contaminant Information

Name Level Description Media Comments
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil DRO above cleanup levels was detected at a maximum of 9,600 mg/kg at 13 feet below ground surface at the site a 3 former USTs.
DRO > Table C Groundwater Final detection in groundwater at MW-2, down gradient of Building 54 was 2,240 µg/L in 2010. Two other monitoring wells were below cleanup levels at 528-1,180 µg/L.
Benzo(a)anthracene > Table C Groundwater Concentration exceeding cleanup levels in 2010 = 0.35 µg/L.
Benzo(a)pyrene > Table C Groundwater Concentration exceeding cleanup level in 2010 = 0.34 µg/L.
Benzo(b)fluoranthene > Table C Groundwater Concentration exceeding cleanup level in 2010 = 0.88 µg/L.
Indeno(1,2,3-cd)pyrene > Table C Groundwater Concentration exceeding cleanup level in 2010 = 0.25 µg/L.

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
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.
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.
Other Standard condition.
Periodic Review ADEC will conduct a review of site conditions every three years.

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