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Site Report: Tanana Power Company

Site Name: Tanana Power Company
Address: 2nd and Hill Streets, Adjacent to City Property, Tanana, AK 99777
File Number: 780.38.014
Hazard ID: 3946
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 65.170478
Longitude: -152.075296
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

Surface soils with dark stains and devoid of vegetation were spotted in the northwest corner of the property. Analysis of a soil sample collected on adjacent property near the stained area had elevated levels of BTEX, GRO, DRO, RRO, SVOCs, PAHs and trace levels of pesticides (DDT). SIC Code for Tanana Power Company Inc. is 4911. The elevation is ~62 meters (~203 feet). Additional samples collected within the property limits in 2008 indicate some contamination with DRO above migration to groundwater levels. Further investigation by the former owner of the Tanana Power Plant was conducted and the site received a Conditional Closure from the DEC in 2012 with Institutional Controls in place. In 2013, the City of Tanana sought to purchase the property with the intent to remove previously identified petroleum contamination to render the site reusable. The City applied for an received a DEC Brownfield Assessment and Cleanup service award. The DEC's Reuse and Redevelopment Program coordinated with the City of Tanana to remove more than 2,000 cubic yards of contamination from the site for offsite treatment. This project was extended into 2014 with the intent of beginning construction following additional source removal. The landfarm is tracked under ADEC File No. 780.38.015.

Action Information

Action Date Action Description DEC Staff
8/13/2001 Preliminary Assessment Approved EPA Superfund Technical Assessment and Response Team (START) file review and site inspection with environmental coordinator Herbie Edwin 8/13/2001. Surface and boring soil samples and on-site DW well water samples collected for lab analysis. -----This was part of an areawide project for Tanana not the TPC property in particular (updated 6/12) Bruce Wanstall
4/11/2002 Site Added to Database Petroleum release. Bruce Wanstall
4/11/2002 Site Ranked Using the AHRM Preliminary ranking. Bruce Wanstall
1/15/2003 Update or Other Action See Tanana City Drinking Water database file for background. Douglas Bauer
8/4/2005 Update or Other Action Telephone conversation with Dave Nyman a consultant in Anchorage. Douglas Bauer
8/26/2005 Update or Other Action Received report from PERP. New sewer line construction in utility easement along the northern perimeter of Lot 8 (former Power Plant) encountered contaminated soil. Workers complained of strong fuel odors and encountered a 6 inch layer of dark stained soil at 13.5 feet. One sample and its duplicate taken from this layer of apparent hydrocarbon stained soil near the west end of the trench, contained DRO levels of ~ 20,000 mg/kg. Samples from the soil stockpile and soil from the east end of the trench contained petroleum contamination near cleanup levels. Kim DeRuyter
8/8/2007 Update or Other Action Assign file number. Wendy Uzzell
3/20/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Tamara Cardona-Marek
5/15/2008 Update or Other Action Talked to Don Eller (Tanana Power Company). He will hire a consultant to do a site assessment at the TPC site this summer. Also forwarded copy of documents on the disposal of PCB's from 1997. Tamara Cardona-Marek
7/25/2008 Update or Other Action Spoke with consultant (Amundsen Environmental) and discussed sampling on site. Trench will be excavated and samples taken up to 13.5 feet deep starting in the northwestern corner of the property. Information on potential sources and exposure pathways will be collected during initial sampling on July 28. Tamara Cardona-Marek
2/17/2009 Update or Other Action Lat-Lon updated Tamara Cardona-Marek
8/21/2009 Proposed Plan A work plan has been submitted for excavation of contaminated soils at the site (potentially an interim removal action). Complete characterization has not taken place, however, excavation will include screening and collection of confirmation samples and stockpile of contaminated soils offsite. Details of the work plan are being discussed prior to approval. Tamara Cardona-Marek
10/21/2009 Update or Other Action ADEC has been in communication with the site owner to perform a site characterization that would provide additional information at the site, including whether or not contamination has impacted the groundwater. A workplan is being developed for the work to take place in 2010. Tamara Cardona-Marek
8/2/2010 Meeting or Teleconference Held DEC had a teleconference with RP and consultant to discuss the most recent revision of the work plan. Interim removal action work plan proposed excavation of 800 cy of contaminated soil. DEC recommended that additional site characterization is done prior to attempted cleanup, since levels may be below health based levels. Tamara Cardona-Marek
8/6/2010 Update or Other Action Consultant submitted a revised work plan to perform additional site characterization to delineate the vertical and horizontal extent of contamination through sampling of soil from an additional excavation of 12 test pits. DEC will submit comments to this workplan. Tamara Cardona-Marek
8/10/2010 Site Characterization Workplan Approved DEC received and reviewed the most recent revision of the site characterization work plan. Amundsen Environmental intends to characterize contamination and delineate the vertical and horizontal extent by excavation up to an additional 10 test pits and sampling for petroleum compounds, VOC's, PAH's and metals. Work plan was approved with some additional comments. Work is planned for the week of August 16th. Tamara Cardona-Marek
7/21/2011 Update or Other Action DEC discussed internally alternatives to resolve the remaining groundwater question in Tanana. Alternatives to be presented to RP include waiting for a drill rig to be available in Tanana or establishing an alternate point of compliance at the edge of the river and sampling porewater in the direction of the river. Tamara Cardona-Marek
8/10/2011 Meeting or Teleconference Held DEC met with property owner to discuss the alternatives to evaluate groundwater at the site. An alternate point of compliance will be established at the edge of the river and porewater samples will be collected during the low stage of the river to assess for potential contamination migrating to surface water. Excavation of identified hot spots in the surface and subsurface soil will be done on the property at depths above permafrost. Work will be done in 2012. Tamara Cardona-Marek
1/31/2012 Update or Other Action DEC was contacted by Tanana Power Company. They are starting to make their plans for summer work and want to make sure they can install the requested drive points to be sampled during low water, possibly in the spring prior to breakup. They may be requesting a waiver of the 3rd party requirement for the installation of the drive points, however they will have a consultant to collect the samples. Tamara Cardona-Marek
6/5/2012 Site Characterization Report Approved DEC received from FES the report for the sampling of the pore-water along the Yukon River and downgradient from the Tanana Power Company. None of the contaminants analyzed for were detected in any of the three temporary sampling wells installed. Sampling was conducted during the low stage of the river as requested. Tamara Cardona-Marek
6/7/2012 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 74921 release from diesel tanks . Tamara Cardona-Marek
7/6/2012 Cleanup Complete Determination Issued DEC has granted a Cleanup Complete with Institutional Controls. Tamara Cardona-Marek
7/6/2012 Institutional Control Record Established Institutional Controls established and entered into the database. Tamara Cardona-Marek
8/2/2012 Update or Other Action Deadline for submission of the signed institutional controls agreement and the recorded deed notice has been extended to September 15th, 2012. Tamara Cardona-Marek
9/18/2012 Site Reopened Site reopened due to failure to submit the institutional controls agreement in a timely manner. Tamara Cardona-Marek
10/10/2012 Cleanup Complete Determination Issued Institutional Controls agreement signed and returned to DEC. Tamara Cardona-Marek
6/24/2013 Brownfields Award Received approval from EPA clearing site for assessment services. FY 2014 EPA STRP funds $37,805 awarded to the City of Tanana for a workplan development with soil sampling on Tanana Former Tanana Power Company and New City Building. NTP 18803603007. Associated Brownfield file #780.57.003 not in database. See associated landfarm file 780.38.015. John Carnahan
6/26/2013 Meeting or Teleconference Held Reuse & Redevelopment Staff met wtih Tanana City Council to discuss proposed DEC Brownfield Assessment services to supplement City construction on site. John Carnahan
6/26/2013 Update or Other Action Project oversight transferred to IC Unit. The Reuse & Redevelopment Program (Brownfields) will continue to work with the City of Tanana to complete assessment activities under the DBAC program, that meet requirements of institutional controls placed on property. John Carnahan
7/3/2013 Institutional Control Compliance Review IC compliance review conducted. Reminder system set-up to follow-up with the responsible party in 2015. Kristin Thompson
8/16/2013 Meeting or Teleconference Held Meeting with S&W and City of Tanana to discuss pending site work to excavate and remove material from the former Tanana Power site. Discussed basic workplan agenda items and anticipate field workplan draft within 1 to 2 weeks, with field work commencing early September. John Carnahan
9/9/2013 Document, Report, or Work plan Review - other Workplan to complete excavation onsite approved. Covers the handling, sampling, and treatment offsite of potentially contaminated soil. John Carnahan
9/27/2013 Update or Other Action As of 9/25/2013, the excavation and removal action for the foundations of two structures on the site is complete. An estimated 2,300 cubic yards of material were removed and taken to a controlled landfarm location near the Tanana dump. The excavations shall be filled with apprporate gravel material. John Carnahan
10/7/2013 Update or Other Action Site symbol visually adjusted using ArcGIS and documents from the file. 65.170478, -152.075296. 10/7/13; MLB. Michelle Barnes
2/21/2014 Brownfields Award FY 2015 EPA State and Tribal Response Program (STRP) funds $91,197 awarded to the City of Tanana for additional excavation and landfarming impacted soils at the Tanana Power Company and landfarm site, x-ref 780.38.015. NTP# 18803603007D. Cascade Galasso-Irish
4/29/2014 Site Characterization Report Approved Corrective Action Report received and approved. Forwarded to City of Tanana. Further cleanup action to occur at site and more complete documentation to follow. John Carnahan
8/29/2014 Update or Other Action ADEC received a work plan from Shannon&Wilson to excavate more impacted material from Excavation 1 and Excavation 2 (the 2013 excavations for the foundations of the proposed buildings). Additional excavation from Excavation 1 and Excavation 2 was not to exceed 500 cubic yards. Lisa Krebs-Barsis
1/12/2015 Update or Other Action Rec'd file from Fairbanks 1/12/2015 for Lisa Krebs-Barsis Susan Carberry
6/30/2015 Site Characterization Report Approved In 2014, an additional 500 cubic yards of material were removed from the 2013 Excavation 1 and Excavation 2. At the limits of the 2014 excavations, DRO in Excavation 2 exceeded maximum allowable cleanup levels at 27,700 mg/Kg DRO. Benzene contaminated soil remained in Excavation 2 at up to 0.025 mg/Kg. Soil contaminated above cleanup levels with 1-methylnaphthalene, 2- methylnaphthalene, and naphthalene remained in the excavation at concentrations of up to 46.2 mg/Kg, 51.9 mg/Kg, and 21.0 mg/Kg,respectively. In Excavation 1, DRO contaminated soil remained in place at up to 10,400 mg/Kg. Contaminated soil was landspread in an 8,000 square foot area adjacent to the 2013 landspread. Lisa Krebs-Barsis
7/28/2015 Update or Other Action Letter sent to City of Tanana requesting information on current site conditions and notifying the City that a separate site would be opened to track the landfarming of the 2,800 CY of contaminated soil (See ADEC File No. 780.38.015). ADEC also requested a description of the tilling activities, and a work plan for continued tilling and collecting of samples from the landfarm. Lisa Griswold
9/7/2016 Update or Other Action At this time, the current project manager chooses to retain management of this site which has institutional controls. IC Unit

Contaminant Information

Name Level Description Media Comments
DRO > Human Health/Ingestion/Inhalation Soil Contaminants along the right of way are above direct contact levels. Contaminants on the property are below direct contact levels.

Control Type

Type Details
Notice of Environmental Contamination A deed notice has been requested for the property.

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site. Any proposal to excavate and transport soil or groundwater off site requires ADEC approval in accordance with 18 AAC 75.325 (i). A “site” [as defined by 18 AAC 75.990 (115)] means an area that is contaminated, including areas contaminated by the migration of hazardous substances from a source area, regardless of property ownership .
When Contaminated Soil is Accessible, Remediation Should Occur If and when the soil becomes accessible due to construction or excavation activities, the soil must be evaluated and contamination addressed in accordance with an ADEC approved work plan.
Periodic Review Any future change in land use may impact the exposure assumptions cited in this document. If land use and/or ownership changes, current ICs may not be protective and ADEC may require additional remediation and/or ICs. Therefore Tanana Power Company shall report to ADEC every three years to document land use, or report as soon as Tanana Power Company plans to change land ownership and/or use, if earlier. The report can be sent to the local ADEC office or electronically to DEC.ICUnit@alaska.gov.
Groundwater Use Restrictions Installation of groundwater wells will require approval from ADEC.
Hazard ID Site Name File Number
26425 City of Tanana Former Tanana Power Company Landfarm 780.38.015

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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
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