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Site Report: ADOTPF - Slana Maintenance Station

Site Name: ADOTPF - Slana Maintenance Station
Address: 60 Mile Tok Cut Off, then 1/2 mile down the Nebesna Road, Slana, AK 99586
File Number: 212.26.001
Hazard ID: 24632
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229
Latitude: 62.708467
Longitude: -143.978826
Horizontal Datum:NAD83

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.


Four underground storage tanks (USTs) were removed in 1997: one 2,000-gallon diesel UST, one 8,000-gallon diesel UST, and two 2,000-gallon gasoline USTs. A dispensing island was located above the diesel and gasoline tanks. One of the gasoline tanks had a split seam from the bottom of the tank to within 2 feet of its top and was taken out of service following a release of approximately 1,000 gallons of gasoline in 1979. Approximately 1,200 cubic yards of soil were excavated and stockpiled on site. This soil was later determined to meet ADEC cleanup levels and was approved for use in non-environmentally sensitive areas. All four tanks were removed from a single excavation that extended 18 feet below ground surface (bgs). Soil samples from the limits of excavation detected diesel range organics (DRO) at 5,160 milligrams per kilogram (mg/kg) and gasoline range organics (GRO) at 1,890 mg/kg. The benzene, toluene, ethyl benzene, and total xylenes (BTEX) levels were below ADEC cleanup levels but above detection limits. Highest levels of GRO and BTEX contamination were detected under the former tank where the gasoline release occurred. There is a drinking water well at the site with an estimated depth of 80 feet bgs. It was sampled in 2005 and detected benzene at 0.00265 mg/L and toluene at 0.00331 mg/L which are below ADEC cleanup levels

Action Information

Action Date Action Description DEC Staff
10/1/1997 Underground Storage Tank Site Characterization or Assessment SA by Shannon & Wilson * Not Assigned
12/8/1997 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77138 Site Assessment received at DEC offices * Not Assigned
12/8/1997 Site Added to Database * Not Assigned
12/9/1997 Leaking Underground Storage Tank Cleanup Initiated - Petroleum Excavation removed 50-60 cubic yards of contaminated soil and stockpiled it on site. Extent of impact has not been delineated. * Not Assigned
1/28/2004 Update or Other Action Transferred DEC staff lead from John Carnahan Cynthia Pring-Ham
12/2/2004 Report or Workplan Review - Other Received and reviewed Feb. 2003 report. Another 1000 cubic yards excavated and stockpiled on site. RP recommends further groundwater and stockpile monitoring. Kim DeRuyter
9/12/2005 Report or Workplan Review - Other Received Soil Stockpile and Water Well Sampling report dated Aug 23, 2005. The highest level of DRO in the samples from the stockpile was 1,660 mg/kg. DRO is the only contaminant remaining above cleanup levels, remaining in the stockpile. ADEC approved landspreading of this stockpile in a non-environmentally sensitive area. The water sample contained 2.65 ug/L benzene and 3.31 ug/L toluene, both values are below Table C cleanup levels. Continued monitoring of this well is recommended. Kim DeRuyter
7/24/2006 Institutional Control Record Established 1. A Notice of Residual Contamination will be noted on the ADEC Contaminated Sites Database identifying the nature and extent of contamination remaining on site. 2. In accordance with 18 AAC 78.274(b), ADEC approval is required prior to the excavation of contaminated soil to ensure worker safety issues are addressed and if soil or groundwater is proposed for transport off site. 3. The drinking water well shall be monitored during the summer of 2006 for GRO, DRO, and BTEX compounds Shannon Oelkers
7/24/2006 Conditional Closure Approved The cleanup actions at this site resulted in the removal of four USTs and 1200 cubic yards of contaminated soil. There is soil remaining above the ADEC cleanup levels (for DRO and GRO) established for the site but further removal was not practicable due to the depth and scope of the excavation. Based on the information provided to date, ADEC has determined that the soil contamination remaining at the ADOT&PF Slana Maintenance Station does not pose an unacceptable risk to human health or the environment provided site specific conditions and/or controls are attached to the property. Shannon Oelkers
2/16/2012 Update or Other Action Staff changed from Bill Petrik to IC Unit. Kristin Thompson
10/21/2015 Institutional Control Compliance Review IC compliance review conducted. A requirement of closure was that groundwater monitoring be completed in 2006. If it was we did not receive record of it. Contact the RP to request this information. Evonne Reese
10/26/2015 Institutional Control Update Contacted ADOT and they are going to schedule a drinking water sample event for this location. Once we receive the sampling results we'll determine if ICs are needed into the future. Evonne Reese
11/23/2016 Institutional Control Update This site has an injection well that is going to be decommissioned in 2018. The drinking water sampling will be performed at the same time. The reminder system has been updated to check back in late 2018. Evonne Reese
12/29/2016 Institutional Control Compliance Review IC compliance review conducted. Closure/IC Details updated. Kristin Thompson
2/19/2019 Institutional Control Update The drinking water well was sampled during the December 2018 injection well decommissioning. The water was sampled for volatile organic compounds (VOCs) which did not contains analytes above the Table C cleanup levels. The 2006 groundwater monitoring requirement will be removed for this site. All other institutional controls requirements will remain in place. Evonne Reese

Contaminant Information

Name Level Description Media Comments
GRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil

Control Type

Type Details
CS Database Notation And Letter To Landowner/RP In accordance with 18 AAC 78.274(b), ADEC approval is required prior to the excavation of contaminated soil to ensure worker safety issues are addressed and if soil or groundwater is proposed for transport off site.


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.
Hazard ID Site Name File Number
26927 ADOT&PF Slana Maintenance Station Class V Injection Well 212.38.003

Missing Location Data

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