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

Site Name: ADOT&PF Tazlina Maintenance Station Class V Injection Well
Address: Mile 110 Richardson Highway, Glennallen, AK 99588
File Number: 2260.38.002
Hazard ID: 26949
Status: Active
Staff: Michael Hooper, 9074515174 michael.hooper@alaska.gov
Latitude: 62.044084
Longitude: -145.425712
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 September 2012, Alaska Department of Transportation & Public Facilities (ADOT&PF) consultants drilled a soil boring through the slab of the garage near the presumed location of the one onsite sub-slab concrete block injection well and collected one soil sample from about 10 feet below grade. Multiple polycyclic aromatic hydrocarbon (PAH) analytes were detected in the sample at concentrations greater than DEC soil cleanup levels, and the levels of detection for several volatile organic compound (VOC), semi-volatile organic compound (SVOC), and PAH analytes exceeded their respective cleanup levels. ADOT&PF returned to the site in October 2018 to decommission the injection well system in accordance with their EPA-approved work plan. ADOT&PF also rerouted the current injection well to a newly constructed collection system to eliminate discharge. Coordination with the Underground Storage Tank Program was necessary due to the presence of a buried waste oil collection tank.

Action Information

Action Date Action Description DEC Staff
6/12/2018 Site Characterization Workplan Approved Injection well work plan addendum for closure approved by EPA. DEC provided comments prior to completion on 2/21/2018. John Carnahan
10/16/2018 Update or Other Action Update from field that contamination has been identified and photographs of open injection well sent to DEC. John Carnahan
10/16/2018 Leaking Underground Storage Tank Cleanup Initiated - Petroleum UST removal actions planned at Tazlina and closure form submitted to UST Program. John Carnahan
12/7/2018 Update or Other Action Email from DOT regarding contamination found at the Tazlina Maintenance Station from the use of injection well TZ-IW-1. Approximately 1,900 gallons of injection well, sump, and piping contents were removed from the IW system. In addition, approximately 35 cubic yards of soil was removed from around the injection well. Contamination was removed to the extent possible and groundwater was not encountered. John Carnahan
12/10/2018 Site Added to Database A new site has been added to the database Mitzi Read
1/21/2019 Update or Other Action Draft of Site Characterization report submitted to DEC. John Carnahan
2/14/2019 Document, Report, or Work plan Review - other DEC provides review comments on Site Characterization reporting. In general, the site was contaminated, gross contamination removed but not fully delineated, a new garage drain system was installed, and further assessment planned. 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
9/26/2019 Document, Report, or Work plan Review - other Approved 2019 Workplan Addendum for site characterization to include VI sampling, drinking water sampling and soil characterization through borings. 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
12/7/2020 Site Characterization Report Approved Reviewed SC report and provided comments via email. 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
11/22/2021 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 80316 name: Class V Injection Well Michael Hooper
1/12/2022 Site Characterization Workplan Approved Approved workplan for additional air sampling in winter followed up by installation of a monitoring well down gradient from the removed IW in Summer. Michael Hooper
12/30/2022 Site Characterization Report Approved Approved 2022 Site characterization report. The report recommends discontinuing air monitoring as residual contamination from TZ-IW-1 does not appear to be a significant contributor to observed contaminants in indoor air. Another round of groundwater sampling is recommended to confirm that groundwater has not been impacted. ADEC agrees with these recommendations. Michael Hooper
7/11/2023 Site Characterization Workplan Approved Approved workplan for collection of one groundwater sample. If contamination is not found DOT&PF can decommission the monitoring well. Michael Hooper
1/9/2024 Site Characterization Report Approved Reviewed workplan for groundwater monitoring and recommended that DOT&PF move forward with decommissioning monitoring wells. DEC will evaluate this site for closure. 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

There are no documents for this site report.

Hazard ID Site Name File Number
24628 ADOT&PF Tazlina Maintenance Station 2260.26.001

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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