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Site Report: ADOT&PF Slana Maintenance Station Class V Injection Well

Site Name: ADOT&PF Slana Maintenance Station Class V Injection Well
Address: 60 Mile Tok Cut Off, then 1/2 mile down the Nebesna Road, Slana, AK 99586
File Number: 212.38.003
Hazard ID: 26927
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 62.707519
Longitude: -143.978239
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

In June 2010, the Alaska Department of Transportation and Public Facilities (ADOT&PF) had contractors investigate one injection well (SL-IW-4) at the Slana Maintenance Station. One boring was advanced in the estimated proximity of the septic tank and north of the original leach field. The investigation was determined to be insufficient to characterize the site. There are potentially other active injection wells at the site that will require investigation. In 2018, ADOT&PF initiated activities to address all injection wells, to include excavation, inspection, and removal of gross contamination. Upon completion of this work, three injection wells were described, as IW4, IW5 and IW6. IW's 4 and 5 are connected and could be deemed a single system, and were located south of the M&O facility. IW6 was located adjacent to the SW corner of the building and consisted of a buried perforated drum. Contamination was identified and gross visible contamination was excavated and removed at the time of IW decommissioning.

Action Information

Action Date Action Description DEC Staff
9/24/2018 Site Added to Database A new site has been added to the database Mitzi Read
12/7/2018 Update or Other Action Site status changed to Active based on Site Characterization results during injection well decommissioning. Primary contaminant remaining following injection well decommissioning is DRO below human health levels, but above MTGW cleanup levels. Groundwater is estimated at 80 feet below grade. John Carnahan
12/5/2019 Meeting or Teleconference Held Meeting held with ADOT and Shannon & Wilson to discuss 2019 sampling season and plans for 2020. Michael Hooper
12/8/2020 Cleanup Complete Determination Issued A cleanup complete determination has been issued. Michael Hooper
12/8/2020 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 80296 name: Class V Injection Well Michael Hooper
12/8/2020 Update or Other Action Site closure approved by EPMII. All contamination was removed from 2 of 3 injection wells. Minor soil contamination remaining under IW-6 is not expected to impact groundwater. Michael Hooper

Contaminant Information

Name Level Description Media Comments
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil DRO remaining at 345mg/kg under IW6

Control Type

Type Details
No ICs Required

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.
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)
Hazard ID Site Name File Number
24632 ADOTPF - Slana Maintenance Station 212.26.001

Missing Location Data

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