Skip to content Skip to content

Alaska Department of Environmental Conservation

You are here: DEC / SPAR / CSP / SPAR Online Services / Contaminated Sites Search / Site Report

Site Report: NPS Denali Nat'l Park Bldg 107

Site Name: NPS Denali Nat'l Park Bldg 107
Address: Headquarters Building 107, Denali Park, AK 99755
File Number: 220.38.012
Hazard ID: 4107
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 63.720441
Longitude: -148.964956
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

Building 107 is an administrative building located in the Headquarters area of Denali National Park. This site was the main bulk fueling facility for the park until 1984. Previously, one 1,000-gallon gasoline underground storage tank (UST) and one 1,200-gallon diesel UST were located 80 feet uphill on the west side of Building 107 and two 8,000-gallon diesel above ground storage tanks (ASTs) were located on a concrete pad 40 feet southwest and uphill from the building. A fuel loading area was located at the current paved driveway and parking area, 35 feet south of the building. Piping connected the UST area and the AST tanks to the fuel loading area. The National Park Service (NPS) removed the tanks, piping, and fuel loading area in 1984. No soil samples were collected at the time. NPS workers noted diesel odors during work on the south side of Building 107, at the former fuel loading area, in 2002. A 2004 site assessment identified diesel contamination at the former AST area and the former fuel loading area. At the former AST area concrete pad, four samples, collected from depths of 1.5 to 2 feet, had diesel range organics (DRO) ranging from 629 mg/kg to 23,900 mg/kg. At the former fuel loading area, one soil boring was drilled through the paved driveway/parking area, south of the building to a depth of 80 feet. One sample collected at 10 feet had gasoline range organics (GRO) at 758 mg/kg and DRO at 11,400 mg/kg. Groundwater was not encountered in the soil boring. Two soil borings were drilled at the locations of the former USTs. One boring had benzene at 0.031 mg/kg. No other analytes were above the cleanup level in either boring. In 2006 approximately 900 cubic yards of petroleum contaminated soil was removed from the site at the area of the former ASTs. The concrete pad was removed and disposed of, and the soil was taken to OIT for thermal treatment. Confirmation sampling from the excavation indicate that DRO remains in the soil above cleanup levels (3,380 mg/kg). Regenox, an oxidizing agent, was added to the excavation before backfill, to help further degrade remaining petroleum.

Action Information

Action Date Action Description DEC Staff
8/20/2004 Site Characterization Workplan Approved Workplan approved this date. Anne Marie Palmieri
1/28/2005 Site Characterization Report Approved Report approved. Contamination found at the pad for the former ASTs and under the parking lot where the fueling station used to be. Additional characterization/cleanup needed. Anne Marie Palmieri
2/10/2005 Site Added to Database DRO concentration in soil reached 23,900mg/kg. Bruce Wanstall
2/10/2005 Site Ranked Using the AHRM Oil spill volume, surface water usage for drinking water and petroleum contamination of surface water are not determined at this time. Multiple sources for petroleum contamination of soil at the site have been identified. Anne Marie Palmieri
3/21/2005 Update or Other Action Additional action will occur this summer. Anne Marie Palmieri
7/1/2005 Update or Other Action Workplan submitted for soil excavation. (Action entered 6/13/08). Janice Wiegers
7/11/2006 Update or Other Action Approved transport of approx. 800 cy of petroleum contaminated soil from job site to OIT in Fairbanks. This is as per previously approved 2004 workplan; however, work was delayed due to operation and funding issues. Mike Jaynes
6/13/2008 Interim Removal Action Approved Reviewed Report for Building 107 Soil Excavation submitted by Hart Crowser in August 2006. 900 cubic yards of soil was excavated. Confirmation soil samples were below cleanup levels for BTEX and DRO, except for three samples. The highest DRO contamination remaining was 11,400 mg/kg, which was located beneath an asphalt parking area. Regenox was added to the excavation before backfilling. Janice Wiegers
6/18/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Janice Wiegers
1/25/2011 Conceptual Site Model Submitted The CSM identifies indoor air as a potential exposure pathway. Soil vapor sampling is proposed to evalute the potential for exposure. 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
8/14/2012 Site Characterization Workplan Approved Approved the final soil vapor assessment work plan. Previous investigations show petroleum hydrocarbons reaming in the soil from spills and leaks associated with a former fueling station located adjacent to Building 107. To evaluate the indoor air exposure pathway, the NPS proposes to collect shallow, near-slab soil vapor samples and complete a building survey. Melody Debenham
1/18/2013 Site Characterization Report Approved Approved the final vapor assessment report describing vapor intrusion assessment activities at Building 107. To evaluate the indoor air exposure pathway, the NPS consultant completed a building survey and installed 4 soil vapor probes to collect shallow, near-slab soil vapor samples. There were 7 compounds detected in the soil vapor samples, none above the target levels for residential or commercial use. Melody Debenham
5/15/2014 Site Characterization Workplan Approved Approved final soil vapor assessment work plan describing the collection of a second round of sampling from the vapor monitoring points installed at this site in 2012. Melody Debenham
8/15/2014 Update or Other Action Coordinated with NPS regarding upcoming utility work at site. If contaminated soil is encountered during excavation activities, it may be placed back into excavation at the same location. Site will be repaved at the end of utility work. Melody Debenham
9/30/2014 Potentially Responsible Party/State Interest Letter Potentially responsible party letter sent to the National Park Service. Melody Debenham
10/22/2014 Document, Report, or Work plan Review - other Approved Final 2014 Soil Vapor Sampling Report. Soil vapor samples were collected from soil the four vapor probe locations that were installed in 2012. No compounds were detected in any of the samples. Melody Debenham
2/13/2017 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 75080 Diesel spill from ASTs. 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 added to reflect the 2017 Decision Document. Reminder system set to follow-up every three years. Kristin Thompson
2/2/2021 Institutional Control Compliance Review IC compliance review conducted. The NPS remains the property owner. A letter to the landowner was not issued at this time. Site review frequency changed to every five years. Evonne Reese

Contaminant Information

Name Level Description Media Comments
GRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Sample results from the former former fueling area contained GRO at 785 mg/kg, 10 feet below ground surface.
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Sample results from the former former fueling area contained DRO at 11,400 mg/kg, 10 feet below ground surface
BTEX Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil One sample from the former UST location had a benzene exceedance of 0.031 mg/kg at 30 feet below ground surface.

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

No associated sites were found.

Missing Location Data

Because the GIS location data for this site has not been entered, we cannot direct you to its position on the map. Click "Continue" to proceed to the Contaminated Sites Web Map or "Close" to return to the site report.
Continue     Close

Public Notices  •  Regulations  •  Statutes
Press Releases  •  Contact

 

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