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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
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.


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. No Longer Assigned
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. No Longer Assigned
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). No Longer Assigned
4/19/1990 Site Ranked Using the AHRM Initial ranking. No Longer Assigned
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 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

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


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.

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