Site Report: NPS Denali Nat'l Park HQ Bldg 12-13
| Site Name: | NPS Denali Nat'l Park HQ Bldg 12-13 |
|---|---|
| Address: | Denali National Park, Denali Park, AK 99755 |
| File Number: | 220.38.009 |
| Hazard ID: | 3949 |
| Status: | Cleanup Complete |
| Staff: | No Longer Assigned, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 63.721620 |
| Longitude: | -148.964333 |
| Horizontal Datum: | WGS84 |
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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
Soil contamination found in mid June 2002 when UST removed from between buildings 12 and 13 at Denali NP Headquarters. Soil was excavated and taken for thermal remediation. Contamination above ADEC cleanup levels remained at bottom of excaxation. A borehole was drilled to a depth of 20 feet. 1380 mg/Kg DRO at 11 feet. Below detection limits at 16-feet depth. No BTEX.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 8/6/2002 | Update or Other Action | Excerpts from a a site investigation report received. | Jeff Conn |
| 12/17/2002 | Site Added to Database | DRO. Site transferred from PERP. | Jeff Conn |
| 2/20/2008 | Update or Other Action | Teleconference with Bill Heubner and Tammy Scholten. Discussed review of this file. Confirmation sampling after the tank removal showed that DRO up to 4,730 mg/kg remained at 7 ft bgs. Based on installation of a soil boring (BH-1), Hart Crower estimated 1-2 cy remained; however, BH-1 appears to have been place at the clean end to the excavation and not where the DRO was observed. DRO was detected at 1,380 mg/kg at 11 ft bgs in BH-1. | Janice Wiegers |
| 2/25/2008 | Exposure Tracking Model Ranking | Initial ranking with ETM completed. | Janice Wiegers |
| 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 |
| 3/15/2013 | Conceptual Site Model Submitted | Received the final conceptual site model (CSM) for Headquarters Buildings 12 and 13. The CSM identifies the incidental soil ingestion, and inhalation of indoor and outdoor air as complete pathways. The limited volume of residual contamination at this site makes these pathways insignificant. | Melody Debenham |
| 3/15/2013 | Exposure Tracking Model Ranking | A new updated ranking with ETM has been completed for source area 74924 500-gallon HOT. | 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 |
Contaminant Information
| Name | Level Description | Media | Comments |
|---|---|---|---|
| DRO | Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation | Soil | The excavation at the UST location detected DRO at 4,730 mg/kg a the bottom of the excavation (10 feet below ground surface). A boring installed to determine vertical extent found DRO at 1,380 mg/kg at 11 feet below ground surface. |
Control Type
| Type | Details |
|---|---|
| No ICs Required |
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) |
No associated sites were found.