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Site Report: IHS Tanana - Bldg. 303

Site Name: IHS Tanana - Bldg. 303
Address: IHS Tanana Hospital Generator Building, Tanana, AK 99777
File Number: 780.26.004
Hazard ID: 24328
Status: Active
Staff: Sophia Bracio, 9074511682 sophia.bracio@alaska.gov
Latitude: 65.171744
Longitude: -152.092592
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

Diesel range organics remains in soil due to releases from a former UST. Groundwater has been sampled several times, DRO was detected slightly exceeding the cleanup level in 2002 at 1.8 mg/L in MW-5 located about 35' downgradient of the former tank. Subsequent samples detected DRO, GRO, and BTEX below cleanup levels. The building was demolished in 2009.

Action Information

Action Date Action Description DEC Staff
5/15/1992 Site Added to Database Former Staff
5/15/1992 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77649 ADD; Former Staff
6/19/1996 Underground Storage Tank Site Characterization or Assessment SA1; 4/95 Site assessment report rec'd 5/11/95 Former Staff
6/19/1996 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU; 1000-gal UST removed 9/6/94. Unable to estimate approx. how much contam. soil removed as several USTs & ASTs from nearby bldgs were removed along with their soil and mixed together to make a huge stockpile. Bioremediation of stockpile to be done by ADCOE in '95. Former Staff
6/19/1996 Underground Storage Tank Site Characterization or Assessment SA1R; Reviewed rept. 6/6/95 for mtg. on 6/12/95. Several soil borings done 10/7-8/94 showed subsurface contam. at high levels. Borings were @ 5, 10 & 15 ft. Levels of GRO,DRO,TRPH,BTEX & Lead are highest at 5 ft. bgs & decrease with depth. Max.levels:GRO=1,700 ppm,DRO=32,000 ppm,TRPH=39,000 ppm,BTEX=27 ppm, Lead=32. Former Staff
6/19/1996 Update or Other Action UPD; Mtg. on 6/12/95 w/ADCOE, IHS & USPHS indicated that the next phase will be a Release Investigation with special emphasis on ground water. Plans are to begin summer of '95. Also about 6,500 cubic yards of contam. soil from entire area may be treated by hot air vapor extraction. Former Staff
6/19/1996 Site Visit LFI; Hazcon, Inc. hired during 9/13-23/91 to conduct LFI of entire facility areas. Old generator shack w/inactive full 1000-gal UST used as HOT/emerg. generator. Located close to active drinking water well. Found heavy soil contam. w/DRO. Surface=3,871 ppm, 2.8 ft.bgs=4,512 ppm, 5.4 ft. bgs=4,167 ppm. Suggest remove. Former Staff
9/8/1997 Update or Other Action In 1997 50 cy of soil from the Tanana Gas Company was added to the USPHS soil stockpile. 2007 database update to reflect information gathered from the administrative file. Shannon Oelkers
2/20/2007 Exposure Tracking Model Ranking Intitial Ranking Complete for Source Area: 77649 (Autogenerated Action)
2/2/2010 Update or Other Action A Hazardous Materials survey was conducted prior to demolition of several old buildings on the IHS campus. PCBs were detected to 3.4 mg/kg on the floor of the generator building (Bldg 303). The building was demolished during the summer of 2009. ADEC has requested that IHS submit a sampling and analysis plan to determine the extent of the PCB contamination on the slab and surrounding soil. Kim DeRuyter
5/25/2010 Site Visit DEC made a visit to Bldg. 303 to discuss the next steps for the remediation process and to see progress made thus far. DEC suggested different sampling options with a tribe representative and a local contractor for the concrete slab. DEC recommended soil samples should be taken along the back wall of the former building and out the area where the front door was based on visual soil observations and common practice at the time the building was in use. It was also recommended by DEC that becuase of existence of PCBs the area be covered by a tarp and roped off to discourage people from entering the area. A sampling plan will be developed by the RP this summer. Meghan Dooley
6/22/2010 Meeting or Teleconference Held DEC(Dooley, Howard, Crapps) held a teleconference with Kathleen Peters-Zuray (TTC) and Kathryn Foster (Ridolfi) to discuss the sampling plan for the concrete slab. DEC answered questions regarding recommended sampling methods and what would be required to be in compliance with regulations. Meghan Dooley
7/13/2010 Update or Other Action The SAP for Bldg 303 concrete slab was received on this date. The document suggests using TSCA grid sampling to characterize PCBs on the slab in order to determine disposal options. Meghan Dooley
7/20/2010 Document, Report, or Work plan Review - other Comments for the Sampling and Analysis Plan for Bldg 303 were sent on this date. Major concerns were clarification on sampling methods and the use of a qualified person for sampling and removal activities. Meghan Dooley
7/23/2010 Site Characterization Workplan Approved The Sampling and Analysis Plan for further characterization of Bldg 303 was approved on this date. Meghan Dooley
9/3/2010 Update or Other Action The Revised Removal Action Work Plan for Building 303 was approved on this date. The concrete slab will be removed completely and disposed of out of state in September 2010. Meghan Dooley
7/8/2011 Update or Other Action DEC received the shipping manifest for the PCB contaminated concrete building slab from the former building 303. The slab was removed and received by Waste Management, Inc in Oregon in October 2010. The manifest notes that the excavation has been covered by a poly liner to mitigate exposure to PCB contamination in the soil below and adjacent to the former building footprint. Meghan Dooley
8/26/2011 Site Characterization Workplan Approved DEC received the draft Soil Sampling and Analysis Plan on August 17, 2011. Comments were sent on August 19, 2011. The final Soil Sampling and Analysis Plan was approved on August 26, 2011. The plan calls for using a grid sampling approach to characterize the Building 303 area for any potential PCB contamination in the soil. Additionally, the plan calls for completing soil borings at 4 different locations throughout the rest of the former hospital site to characterize petroleum contamination in the subsurface. Meghan Dooley
11/30/2011 Document, Report, or Work plan Review - other ADEC received the draft Soil Sampling Analytical Results. Grid sampling was conducted at the former building 303 site to determine if soil around and underlying the former slab area was contaminated with PCBs. Meghan Dooley
11/30/2011 Document, Report, or Work plan Review - other The draft Groundwater Monitoring Analytical Results was received by ADEC. The report discusses groundwater sampling at 5 wells at the IHS site. Samples were analyzed for DRO, RRO, GRO, BTEX, and PAH. The report states that 8 wells were missing and therefore not samples, and water level in another well was too low for the pump to reach in order to collect a sample. Meghan Dooley
12/28/2011 Document, Report, or Work plan Review - other ADEC reviewed and sent comments on the draft Soil Sampling Analytical Results for the building 303 and hospital site. PCB sampling was conducted at Building 303 to determine the extent of potential PCB contamination in the surface and subsurface soil. Meghan Dooley
5/8/2012 Document, Report, or Work plan Review - other ADEC sent additional comments on the revised Soil Sampling Report. Meghan Dooley
2/25/2015 Site Characterization Report Approved The Alaska Department of Environmental Conservation (ADEC) approved a report titled Removal Action Report for the 2012 Field Season – Zone 4, Former AANHS Hospital Site – Native Village of Tanana. The report addresses construction of a remediation treatment area (RTA), excavation of petroleum contaminated soil from Zone 4 of the AANHS Hospital project site, transport of soil to the RTA, and soil sampling as laid out in the Soil Remediation Plan. Soil sample results from the former generator building (Building 303) were below cleanup levels for PCBs, but DRO above ACLs was discovered. This soil will be targeted for removal at a later date. Meredith Savage
8/11/2015 Update or Other Action Site transferred to PM Garroutte. Action items required: review of “Removal Action Completion Report for the 2013 Field Season Zone 1, Zone 2, and Zone 3 Former AANHS Hospital Site – Native Village of Tanana” . Contact IHS about the status of this site. Fred Vreeman
6/9/2016 Site Visit DEC performed a site visit at all IHS Tanana sites and the Remediation Treatment Area. The site status for each area was discussed with IHS and Tanana representatives. Monte Garroutte
3/1/2019 Update or Other Action Note this LUST site is being managed contemporaneously with the CS site "IHS Tanana Health Center" as one large site with multiple source areas as explained in a memo from former PM Colin Craven to former Program Manager Kim DeRuyter, dated March 21, 2008. On March 1, 2019 I reviewed a letter and Interim Report from Ahtna with ISM sample results form the RTA. Results indicate that the top 10-inches of soil (a tilled lift) in the northern half of the landfarm (Decision Unit [DU]-1) meets the SRTLs and cumulative risk does not exceed permissible levels. To allow for unrestricted use, SRTLs are the most stringent 18 AAC 75.341 Method Two, Tables B1 and B2 Soil Cleanup Levels (SCLs). On August 20, 2108, ADEC approved the transport of approximately 1,200 cubic yards (CY) of soil from the landfarm to the borrow pit staging area for reuse by the City of Tanana. The southern half of the landfarm (DU-2) did not meet the SRTLs and will need additional tilling and fertilizer application. On March first I contacted the RP (Tanana Tribal Council; Kathleen Peters-Zuray) introduced myself as the current PM and requested the Operations, Maintenance and Monitoring (OM&M)Report for 2017-2018 and updates on Plans for 2019 work. Ms. Peters-Zuray responded that she would have the contractor (Ahtna) send me the most recent report. John O'Brien
6/18/2019 Update or Other Action Final Remediation Summary Report Approved. John O'Brien
8/4/2021 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77649 UST. Tim Sharp
12/27/2022 Update or Other Action The 117th Congress passed Public Law 117-266 on December 27, 2022. The law specifies "As soon as practicable, but not later than 180 days, after the date of the enactment of this Act, the Secretary shall convey to the Council all right, title, and interest of the United States in and to the property described in paragraph (2) for use in connection with health and social services programs." Jamie McKellar
3/28/2023 Meeting or Teleconference Held Representatives from DEC, Arctic Data Services, Ahtna, Indian Health Services, and the Tanana Tribal Council met to discuss the upcoming federally-mandated land transfer. Jamie McKellar
6/20/2023 Institutional Control Update On June 20, 2023, DEC's Commissioner signed an Environmental Covenant for Lot 12, U.S. Survey 5958, T4N, R22W, Fairbanks Meridian, Alaska. This Covenant subjects the Property to certain activity and use limitations for the property including restrictions on groundwater use and excavations, and notification requirements for construction activities. A copy of the final, signed covenant is attached to the database. Jamie McKellar
8/16/2023 Document, Report, or Work plan Review - other WORK PLAN APPROVED: DEC Approval of 2023 Long-Term Monitoring Work Plan Former Indian Health Service Hospital Site, Tanana, Alaska. Dated July 2023. Jamie McKellar
9/15/2023 Document, Report, or Work plan Review - other WORK PLAN APPROVED: DEC Approved the 2023–2025 Landfarm Operations, Maintenance, and Monitoring, Remediation Treatment Area Work Plan (Arctic Data Services, August 2023). Jamie McKellar
12/8/2023 Document, Report, or Work plan Review - other REPORT APPROVAL: 2022 Remediation Treatment Area Operations, Maintenance, and Monitoring Report Former Indian Health Service Hospital Site, Tanana, AK (Ahtna Engineering Services, LLC, March 2023) Jamie McKellar
12/8/2023 Institutional Control Record Established Institutional Controls established and entered into the database. Sophia Bracio

Contaminant Information

Name Level Description Media Comments
1,2,4-Trimethylbenzene > Table C Groundwater
1,3,5-Trimethylbenzene > Table C Groundwater
1-Methylnaphthalene > Table C Groundwater
2-Methylnaphthalene > Table C Groundwater
Benzene > Table C Groundwater
DRO > Table C Groundwater
Ethylbenzene > Table C Groundwater
GRO > Table C Groundwater
Naphthalene > Table C Groundwater
RRO > Table C Groundwater
Xylenes (total) > Table C Groundwater
Chloromethane < Method 2 Most Stringent Soil
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
Ethylbenzene Other Soil Maximum remaining soil concentration is below Alternate Cleanup Level (ACL).
GRO Other Soil Maximum remaining soil concentration is below Alternate Cleanup Level (ACL).
Isopropylbenzene < Method 2 Most Stringent Soil
n-Butylbenzene < Method 2 Most Stringent Soil
n-Propylbenzene < Method 2 Most Stringent Soil
Naphthalene Other Soil Maximum remaining soil concentration is below Alternate Cleanup Level (ACL).
RRO < Method 2 Most Stringent Soil
sec-Butylbenzene < Method 2 Most Stringent Soil
Toluene < Method 2 Most Stringent Soil
Xylenes (total) Other Soil Maximum remaining soil concentration is below Alternate Cleanup Level (ACL).
Trichloroethene Other Soil Limit of detection (LOD) exceeded soil cleanup levels
Benzene Other Soil Maximum remaining soil concentration is above the Alternate Cleanup Level (ACL).

Control Type

Type Details
Environmental Covenant On June 20, 2023, DEC's Commissioner signed an Environmental Covenant for Lot 12, U.S. Survey 5958, T4N, R22W, Fairbanks Meridian, Alaska. This Covenant subjects the Property to certain activity and use limitations including restrictions on groundwater use and excavations, and notification requirements for construction activities. A copy of the final, signed covenant is attached to the database.

Requirements

Description Details
Groundwater Use Restrictions No groundwater wells shall be installed on the contaminated area of the Property without prior DEC approval.
Groundwater Monitoring Contaminated groundwater underlying the Property may not be pumped, drained, or dewatered; or used for irrigation, dust control, or any other purpose without prior DEC approval. If that use is approved under this Covenant, that use is still subject to all applicable treatment, monitoring, disposal, and permitting requirements.
New Construction Restrictions Any construction, modification, or use of buildings on the contaminated area of the Property is prohibited without prior review and approval by DEC.
New Construction Restrictions If the use of a building on the Site changes, or if buildings are constructed within 30 feet of the Site, DEC must be notified and may require that Grantor complete an evaluation of vapor intrusion and mitigation of any vapor intrusion risks.
Excavation / Soil Movement Restrictions Excavation, drilling, and other intrusive activities below a depth of 5 feet are prohibited within the Site, without prior review and approval from DEC.
When Contaminated Soil is Accessible, Remediation Should Occur In the event that contaminated soil on the Property becomes accessible in the future, the Grantor shall notify DEC, characterize the contamination, and, if determined necessary by DEC, cleanup the soil pursuant to DEC's Site Cleanup Rules.
Subdivision Restriction DEC must be notified in advance of any subdivision or replat of the Property. This Covenant must be included as part of future Property transactions and attached to subsequent associated parcels, as determined applicable by DEC.
Advance approval required to transport soil or groundwater off-site. DEC approval is required prior to moving soil or groundwater where contamination remains above applicable default cleanup levels (Table C or Method Two under current regulations). If DEC approval for movement is granted, any moved soil or groundwater must still be characterized and managed following regulations applicable at that time.
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)
Groundwater Use Restrictions Groundwater throughout Alaska is protected for use as a water supply for drinking, culinary and food processing, agriculture including irrigation and stock watering, aquaculture, and industrial use. Contaminated site cleanup complete determinations are based on groundwater being considered a potential drinking water source. In the event that groundwater from this Site is to be used for other purposes in the future, such as aquaculture, additional characterization and treatment may be required to ensure the water is suitable for its intended use.
Hazard ID Site Name File Number
116 IHS Tanana Health Center 780.38.003

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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
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