Site Report: ADOT&PF 7 Mile Camp
| Site Name: | ADOT&PF 7 Mile Camp |
|---|---|
| Address: | Mile 62 Dalton Highway, 7 Mi. North of Yukon Riv., Stevens Village, AK 99774 |
| File Number: | 330.38.111 |
| Hazard ID: | 873 |
| Status: | Cleanup Complete - Institutional Controls |
| Staff: | IC Unit, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 65.939476 |
| Longitude: | -149.854733 |
| 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
At least 18,000 gallons of diesel fuel reported spilled 1981 - 1989. The majority of the fuel was not recovered and may pose risk to groundwater resources used for drinking water. Extent of contamination unknown. The spills are reported as: January 1989; 6450 gallons of #1 diesel inside the maintenance building floor drains were full of fuel and fuel pooled outside on the hardpacked snow. The estimate was later revised down to 700 gallons. The report does not say where the floor drains are connected to the septic system or not. May 1988; 2000 gallons of #1 diesel spilled due to a leak in the fuel filter in the line between the storage tank and the camp generator. January 29, 1983; 4,500 gallons of #1diesel was spilled when the fuel line broke. 3,000 gallons were recovered from the sewage treatment plant where it had flowed through a utilidor. March 4, 1983; 700 gallons of #1 diesel spilled when a site worker forgot to shut off a valve. Fuel saturated snow was scraped up with a loader. October 1981; 4,500 gallons of #1 diesel was spilled when a fuel line or valve broke. Very little product was recovered. A drinking water well on site is estimated to be between 165 and 180 feet deep; the well is reported to be artesian. The site is built on an old gravel pit which slopes away from the fuel storage area. The site is believed to be built on a thick layer of permafrost. The nearest creek is 1/2 mile away. (rpltr4) (MOA - Proposed but not funded under FY95. Requested $48k). Last staff assigned were Cormack and Sundet.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 10/29/1981 | Update or Other Action | (Old R:Base Action Code = FI - Field Inspection (General)). Caraway visited camp to inspect 10/27/81 spill of 4500 gallon diesel fuel. | Former Staff |
| 2/1/1983 | Update or Other Action | (Old R:Base Action Code = RAU - Remedial Actions Underway (General)). Cormack approved burning of diesel contaminated snow from 1/28/83 spill of 4500 gallon diesel fuel. | Former Staff |
| 2/28/1983 | Update or Other Action | (Old R:Base Action Code = FI - Field Inspection (General)). Drinking water samples taken from local residence (Michael residence). | Former Staff |
| 4/19/1990 | Site Ranked Using the AHRM | Initial ranking. | Former Staff |
| 1/5/1994 | Site Number Identifier Changed | Reckey number changed from 89400102401 to reflect region number change. | Scott Rose |
| 2/23/1998 | Site Added to Database | QA\QC revealed that this action was never added before. | Bill Petrik |
| 7/6/2006 | Update or Other Action | Copied the PERP files, and created a new CS file number for the site as the previous file numbers assigned were 330.02.035, and 330.02.070. Updated the problem statement with a summary of past spills. | Kim DeRuyter |
| 8/29/2006 | Update or Other Action | PM accompanied Darren Mulkey (ADOT), and Mark Lockwood (S&W) on a site visit of the facility to finalize details of the proposed release investigation. | Kim DeRuyter |
| 5/8/2007 | Exposure Tracking Model Ranking | soil and shallow groundwater contamination was identified on site from numerous petroleum spills. drinking water well has been sampled and is non-detect for contamination | Jim Frechione |
| 5/18/2007 | Site Characterization Report Approved | Shannon & Wilson installed 3 soil borings - that were converted to monitor wells. Possible source areas include: used oil UST that was removed in 1995 and now area is covered by shop building and numerous fuel releases in 1980s. Soil sample data indicated soil contamination above migration to GW but below ingestion/inhalation levels. The groundwater at the site consists of a perched (shallow) aquifer underlain by bedrock and/or permafrost. Deeper aquifer is reportedly artesian and used as drinking water source. Extent of soil contaminastion not fully defined but risks to human health and migration to deeper aquifer appear to be minimal. The site information will be evaluated and a decision document prepared regarding the environmental status of the site. | Jim Frechione |
| 6/6/2007 | Conditional Closure Approved | record of decision issued to conditionally close the numerous spills that occurred there and the LUST used oil tank under the shop building. there is residual soil contamination remaining above MTG but below ingestion / inhalation levels and DRO impacted suprapermafrost groundwater. the deeper aquifer is reportedly artesian - indicating a confining layer (bedrock / permafrost) - and protected from the shallow contamination. ADOTPF is required to contact ADEC when contaminated soil becomes accessible and not use shallow groundwater | Jim Frechione |
| 6/6/2007 | Institutional Control Record Established | conditional closure decison allowed residual contamination to remain in the soil and shallow groundwater. ADOTPF is required to contact ADEC when contaminated soil becomes accessible and if they propose to use the shallow groundwater. they would then have to develop a plan to manage the soil and ensure groundwater is treated before use (if in an area of contamination). also - restrictions on off site transport of soil and groundwater | Jim Frechione |
| 12/20/2011 | Update or Other Action | Site management staff changed to IC Unit. | Evonne Reese |
| 12/20/2011 | Institutional Control Compliance Review | IC review conducted, follow up requirements added, and reminder system updated. | Evonne Reese |
| 12/27/2012 | Update or Other Action | This file cross referenced with file 330.26.003 "ADOT&PF 7 Mile Maintenance Station, Mile 62 Dalton HWY". Site symbol adjusted visually by ArcGIS.com and by reference to historical documents found in the files. | Laurel Gale |
| 5/27/2014 | Institutional Control Update | An IC reminder letter was issued to the responsible party on this date. | Kristin Thompson |
| 8/6/2019 | Institutional Control Compliance Review | An Institutional Controls reminder letter e-mailed to the responsible party on this date. | Mossy Mead |
Contaminant Information
| Name | Level Description | Media | Comments |
|---|---|---|---|
| DRO | Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation | Soil |
Control Type
| Type | Details |
|---|---|
| CS Database Notation And Letter To Landowner/RP | the facility is an ADOTPF maintenance station under lease from BLM. the conditions will be listed on the ADEC database and ADOTPF should be notified of the need to contact ADEC when soil becomes accessible and / or if they wish to use shallow groundwater. Periodic sampling of drinking water well is recommended |
Requirements
| Description | Details |
|---|---|
| Excavation / Soil Movement Restrictions | residual soil contamination exists but was inaccessible. ADOTPF shall notify ADEC when it becomes accessible |
| Groundwater Use Restrictions | shallow groundwater is imapacted and shall not be used without ADEC approval ADOTPF shall contact ADEC if they propose use of shallow groundwater |
| Periodic Review | Every five years check with RP to verify that site conditions have not changed and that the shallow groundwater aquifer is not being used as a drinking water supply. |
| Hazard ID | Site Name | File Number |
|---|---|---|
| 26573 | ADOT&PF 7 Mile Maintenance Station Class V Injection Well | 330.38.140 |
| 24594 | ADOT&PF 7 mile Maintenance Station | 330.26.003 |