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Site Report: One Sealaska Plaza

Site Name: One Sealaska Plaza
Address: One Sealaska Plaza, Juneau, AK 99801
File Number: 1513.38.121
Hazard ID: 27263
Status: Active
Staff: Dawn Wilburn, 9072628200 dawn.wilburn@alaska.gov
Latitude: 58.300385
Longitude: -134.407653
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 09/14/2020, during construction activities at One Sealaska Plaza, workers discovered two areas of possible petroleum contamination and one ~1,000 gallon concrete tank containing an unknown volume of possible petroleum product(s). There is documentation of Union Oil Company of California as previous owners of the site but there is not clear documentation of land use under Union Oil Company. Land ownership is in the process of being transferred to Sealaska Heritage (nonprofit) from Sealaska Corporation. Sealaska Heritage is assuming responsibility for the clean-up of this site. Potentially contaminated soil was discovered on September 12, 2020 in two areas of the project site (within Lot 1), and a concrete underground fuel tank (UST) was also discovered. The UST was pumped on September 16, 2020 resulting in eight (8) 55-gallon drums of diesel and water. The broken 1” rusted iron fitting on the top of the UST and the location directly adjacent to the historic store gives indication the UST is a heating oil UST. Within ADEC SPAR CS Underground Storage Tanks Unit decision was made that ADEC had no objection to closing the UST as an unregulated heating oil tank, based on historic maps, plats and property records. This tank has been pulled.

Action Information

Action Date Action Description DEC Staff
9/21/2020 Spill Transferred from Prevention Preparedness and Response Program Spill transferred by PPRP staff Julie Fix. Spill no. 20119925801; spill date = 9/14/2020; substance = petroleum; quantity = unknown; source = multiple releases from unknown sources and one ~1,000-gallon concrete tank containing an unknown volume of possible petroleum product(s). Mitzi Read
9/22/2020 Site Added to Database A new site has been added to the database Mitzi Read
9/24/2020 Document, Report, or Work plan Review - other The CSP completed a review of the Excavation and Sampling Plan dated September 2020. A workplan approval letter was issued. Randy Guintu
9/25/2020 Potentially Responsible Party/State Interest Letter The CSP issued a PRP Letter on September 25, 2020. Randy Guintu
10/8/2020 Update or Other Action Sealaska Remediation submitted a letter regarding the relationship between Sealaska Remediation Solutions, Sealaska Heritage Institute, and Sealaska Corporation. ADEC finds that Sealaska Remediation Solutions will be able to fulfill the role of an impartial third party as required under 18AAC 75.333. Kara Kusche
10/13/2020 Offsite Soil or Groundwater Disposal Approved Soil Transport approved for 1500 cubic yards of petroleum contaminated soil to go to Bicknell Landfarm. Soils with metals contamination above cleanup levels were not proposed to go to, are not approved to go to Bicknell Landfarm. Kara Kusche
11/20/2020 Offsite Soil or Groundwater Disposal Approved Approval issued to transport and dispose 1cy of lead contaminated soil to Clean Harbors Grassy Mountain Landfill Facility in Utah. Kara Kusche
3/4/2021 Offsite Soil or Groundwater Disposal Approved Revised Transport, Treatment, and Disposal form approved for 2200 yards of petroleum impacted soils to go to Bicknell for landfarming. Kara Kusche
5/19/2021 Site Characterization Workplan Approved ADEC approves the "Sealaska Heritage Institute Draft Work Plan Addendum" dated May 11, 2021. This addendum is to the original work plan which was dated September 2020. Objectives of the addendum are to better segregate and characterize stockpiled soils to determine final disposition. Kara Kusche
5/25/2021 Offsite Soil or Groundwater Disposal Approved Supersacked soil is approved to be moved from the Trucano yard to the Coogan yard for temporary staging prior to final disposal. Kara Kusche
6/16/2021 Meeting or Teleconference Held Meeting with Sealaska Remediaiton to go over preliminary soil data at off site locations that soil was taken to. (1) Hilcrest: Napthalene above MTG, below HH. Approximately 30 yards. Landfarming or similar may be best option. (2) Trucano Yard: DRO, mercury, and napthalene above MTG, below HH. Approximately 1000 yards of contaminated soil have been burried under other soils. Soil is approximately a 3' lift, and 60'x65'. (3) Coogan Yard: DRO above MTG, lead above HH, mercury above MTG and below HH, and select PAH and VOC exceedances. Contaminated soil is now burried under other soils. Sealaka Remediation will explore alternative cleanup levels, sampling groundwater, and/or modeling as potential next steps at Trucano Yard and Coogan Yard. Kara Kusche
6/21/2021 Offsite Soil or Groundwater Disposal Approved Approval issued to take ~40 yards of contaminated soil stored at the off site Hilcrest property to Bicknell for landfarming. Kara Kusche
8/16/2021 Offsite Soil or Groundwater Disposal Approved 14 cubic yards of lead contaminated soil approved for transport to and disposal at Clean Harbors facility. Erin Gleason
9/19/2022 Document, Report, or Work plan Review - other ADEC sent comments to Sealaska Heritage Institute on the “Sealaska Heritage Institute Draft Work Plan Addendum II”, dated September 2, 2022. ADEC requested an updated workplan be submitted for review. Jessica Hall
9/27/2022 Site Characterization Workplan Approved ADEC sent the Sealaska Heritage an approval letter for the “Sealaska Heritage Institute Draft Work Plan Addendum II”, dated September 23, 2022. Activities in the workplan include confirmation sampling beneath the former contaminated soil stockpile located at Coogan Construction (Coogan Yard). Contaminated soil will be transported to Waste Management Inc.’s (WMI) Arlington, Oregon facility during October 2022. Following contaminated stockpile removal, collection of soil samples beneath the stockpile will be taken. ADEC requested a final report for site work that has been completed to date, which will be prepared under separate cover and not addressed in this work plan. Jessica Hall
9/23/2024 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 80653 name: One Sealaska Plaza Dawn Wilburn
9/25/2024 Document, Report, or Work plan Review - other Completed review of the Draft Soil and Excavation Disposal report dated September 2024. This report summarized site characterization and stockpile soil management activities from September 2020 through August 2023. Provided comments and requested revised report. Dawn Wilburn
3/26/2025 Site Characterization Report Approved Approved the revised Soil and Excavation Disposal report dated March 2025. This report summarized site characterization and stockpile soil management activities from September 2020 through August 2023. Dawn Wilburn
4/21/2025 Workplan Requested Sent work plan request for additional groundwater characterization and vapor intrusion assessment. Dawn Wilburn

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details

Requirements

Description Details

No associated sites were found.

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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