Site Report: NPS Denali Nat'l Park HQ Bldg 27
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 single wall heating oil above ground storage tank (AST) that serviced both building 27 and 28 was removed and replaced with an individual dual wall tank in 2004. On June 20, 2005, NPS began excavation of contaminated soils along the abandoned fuel oil lines from building 27 to the site of the old AST. Approximately 150 cubic yards of DRO contaminated soil were excavated from the site. Contamination was determined to be very sporadic and as a result, field screening was increased from one event for every 5 cubic yards to every cubic yard of soil removed. When the limits of the excavation were reached, confirmation samples were taken from each side wall, one from the floor of the excavation and one from the top of the boulder where the boulder limited the depth of the excavation. Confirmation soil samples were analyzed for BTEX and DRO. Confirmation sampling indicated that all wall samples were below cleanup levels. The floor samples on the boulder and at the bottom of the excavation had DRO up to 14,000 ppm DRO at 7 feet bgs.
Action Information
Contaminant Information
| Name |
Level Description |
Media |
Comments |
| BTEX |
> Human Health/Ingestion/Inhalation |
Soil |
Excavation at the AST location between Building 27 and 28 detected a maximum concentration of ethlybenzene at 0.35 mg/kg and xylenes at 3.9-2.8 mg/kg at the vertical extent of excavation. |
| DRO |
Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation |
Soil |
Excavation at the AST location between Building 27 and 28 detected a maximum concentration of 14,000 mg/kg and 7,9000 mg/kg at the vertical extent of excavation. |
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.
