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

Site Name: ADOT&PF Nenana Maintenance Station Class V Injection Well
Address: NE of 6th Street and D Street Intersection, Nenana, AK 99760
File Number: 110.38.012
Hazard ID: 26544
Status: Active
Staff: Michael Hooper, 9073345939 michael.hooper@alaska.gov
Latitude: 64.559078
Longitude: -149.086470
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

On June 10, 2013, one soil boring was drilled west of the ADOT&PF Nenana Maintenance Station shop as part of an injection (IW) well investigation and soil samples were collected from the boring at depths of 8 feet and 11.5 feet. Review of as-built drawings revealed that the IW is farther north than the boring; therefore, soil conditions encountered in the boring are not representative of soil conditions at the presumed IW discharge location. Further work was conducted in 2016 to decommission the IW and conduct further assessment. During this activity, a second IW was discovered in-line with the piping to the original IW, and is referred to as the 'settlement tank.' This tank was not contained and was designed to settle out sediment, but also discharged directly to the subsurface. ADOT&PF is addressing this work as part of a Compliance Order with EPA.

Action Information

Action Date Action Description DEC Staff
3/17/2016 Spill Transferred from Prevention Preparedness and Response Program Spill transferred by PPRP staff Ashley Adamczak. Spill no. 13309923707; spill date = 8/25/13; substance = unknown; quantity = unknown; source = injection well; PPRP file no. 150.02.013. Mitzi Read
4/14/2016 Site Added to Database A new site has been added to the database Mitzi Read
4/18/2016 Site Characterization Workplan Approved DEC provides letter to DOT acknowledging that contamination has been identified at site, and that DEC approves of the work plan addendum to conduct further assessment at this site. Letter requests continued coordination with DOT and subsequent detailed reporting upon completion of injection well decommissioning. John Carnahan
4/28/2016 Site Characterization Workplan Approved EPA provides approval of closure plan for one injection well located at facility. DEC reviewed and commented on plan and provided its approval of sampling methods. John Carnahan
7/12/2016 Update or Other Action Field report indicated that one IW (NE-IW-1) and a second apparent IW (settling tank, NE-IW-2) were exposed and removed in part 7/8/2016. PID readings measured up to 82 ppm in saturated soil from the IW structure and up to 113 ppm in sediment from inside the IW piping. Groundwater was observed at 3.5 feet below the ground surface (bgs) on Friday, above the level of the IW. Sheen and strong odor present in settling tank, which was not sealed and allowed groundwater to enter the tank. John Carnahan
11/17/2016 Meeting or Teleconference Held Meeting with EPA and DOT to discuss status and CAFO requirements. John Carnahan
2/21/2017 Update or Other Action DOT submits Nenana Maintenance Station Injection-Well Closure Report to EPA and copies DEC. Reporting designed to meet closure requirements of EPA and adhere to requirements of Compliance Agreement, Final Order, between DOT and EPA. Although DEC played assisting role, the reporting was left to EPA to review and determine if closure was appropriate before DEC assumes oversight role. John Carnahan
6/7/2017 Update or Other Action EPA provides Conditional Closure of Two MVWDW at Nenana DOT Maintenance Facility. The conditions includes ongoing assessment and cleanup/monitoring in coordination with DEC. John Carnahan
8/1/2017 Meeting or Teleconference Held Meeting with DOT and consultant to discuss upcoming proposed field work and work plans. John Carnahan
9/21/2017 Document, Report, or Work plan Review - other DEC approves Site Characterization WP Addendum 2 for Nenana soil and groundwater investigation. John Carnahan
10/29/2018 Site Characterization Report Approved Provided approval for 2017 Site Characterization report following well decommissioning in 2016. Additional well installation is pending, but will be discussed directly. John Carnahan
11/1/2018 Site Characterization Report Approved Provide DEC Approval – Nenana Maintenance Station Injection Well 2016 Site Characterization Report, Final, 29 October 2018. Recommendations include the installation of three additional monitoring wells downgradient of farthest north temporary well point, and advancement of two additional borings south and southwest of IW-1 to define the extent of contamination. DEC agrees with proposed activities. John Carnahan
11/26/2018 Site Characterization Workplan Approved Provide DEC Approval – Generic Work Plan Addendum 028-NE18-3 Final, Nenana Maintenance Station, Additional Site Characterization, 20 November 2018. John Carnahan
3/11/2019 Document, Report, or Work plan Review - other Provide DEC review – ADOT&PF Nenana Maintenance Station Additional Site Characterization, Nenana, Alaska October 2019. John Carnahan
4/29/2019 Site Characterization Report Approved DEC Review and approval for ADOT&PF Nenana Maintenance Station Additional Site Characterization, Nenana, Alaska, Rev 01, April 2019. Minimum of one additional GW sampling will be required. John Carnahan
6/13/2019 Meeting or Teleconference Held Meeting held with ADOT&PF, ADEC, and Shannon and Wilson do discuss site scoping and work prioritization for the next year. Michael Hooper
8/30/2019 Document, Report, or Work plan Review - other Approved General Workplan Addendum for groundwater monitoring at the Nenana Maintenance Station Michael Hooper
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
8/14/2020 Document, Report, or Work plan Review - other Reviewed Report and workplan. Contaminant concentrations appear to be increasing, an additional sampling event is scheduled for august along with well survey to determine the groundwater flow direction and seasonal trends. Michael Hooper
4/26/2021 Site Characterization Report Approved Approved a DRAFT Groundwater Monitoring report. DRO contamination at this site continues to show an increasing trend near IW #2. ADEC agrees with recommendation for continued monitoring and installation of an additional well down-gradient from IW#2 Michael Hooper
10/28/2021 Meeting or Teleconference Held Annual meeting held with DOT Northern Region and contractors to discuss previous field season and plans for the next year. Michael Hooper
11/17/2021 Site Characterization Report Approved Reviewed groundwater monitoring report. Groundwater trends currently appear to be decreasing, however additional sampling is required. Michael Hooper
1/17/2024 Meeting or Teleconference Held Annual Meeting Held with DOT to discuss plans for coming year at all NR UIC sites. Michael Hooper

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details

Requirements

Description Details
Document name File Size Document Date
2021 GW Monitoring Report 10 MB
Hazard ID Site Name File Number
25127 ADOTPF - Nenana Maintenance Station 110.26.006

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State of Alaska Department of Environmental Conservation

P.O. Box 111800
Juneau, AK 99811-1800
Phone: 907-465-5066
Fax: 907-465-5245
TDD: 800-770-8973
Physical Location: 410 Willoughby