Site Report: NPS Denali Nat'l Park HQ Bldg 34
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
The National Park Service performed over-excavation and remediation of contaminated soils associated with the fuel oil AST and associated distribution lines. Approximately 60 cubic yards of DRO contaminated soil were excavated from the site of the single wall AST and its associated piping. Contamination was sporadic, therefore the frequency of the field screening was increased from one event for every 5 cubic yards to every cubic yard of soil removed. When the limit of excavation was reached, confirmation samples were taken from each side wall and one from the floor of the excavation. One wall sample at the interface with the asphalt drive way had a confirmation sample of DRO of 2000 mg/kg. All other soils were clean.
Action Information
Contaminant Information
| Name |
Level Description |
Media |
Comments |
| DRO |
Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation |
Soil |
Confirmation soil samples from the excavation detected DRO at 2,000 mg/kg at 6.5 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.
