Site Report: FAA Fort Yukon Quarters Facility Bldgs 100 & 102 USTs 9-C-7, 9-C-9 & 9-C-10

Site Name:	FAA Fort Yukon Quarters Facility Bldgs 100 & 102 USTs 9-C-7, 9-C-9 & 9-C-10
Address:	Airport Vicinity, Fort Yukon, AK 99740
File Number:	740.38.011
Hazard ID:	25396
Status:	Active
Staff:	Brittani Mack, 9072628205 brittani.mack@alaska.gov
Latitude:	66.570207
Longitude:	-145.240661
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.

Site Chronology
IC / Closure Details
Documents
Associated Sites

Problems/Comments

This site is comprised of multiple underground storage tanks (USTs) at the FAA Fort Yukon Quarters Facility, including Building 100 UST 9-C-7; and Building 102 USTs 9-C-9 and 9-C-10. One underground storage tank was removed at Building 100 in 1995 as documented in the Fuel Storage Tank Decommissioning Assessments, dated 1995. Tank 9-C-7 was a 500 gallon heating oil tank that was removed along with 20 cubic yards of petroleum-contaminated soil. Five (5) confirmation samples were collected and analytical results showed that diesel-range organics concentrations up to 10,000 milligrams per kilogram (mg/kg) remained in soil at the site. During the 1996 Remedial Investigation, three (3) borings were advanced, one (1) of which was completed as a monitoring well. Diesel-range organics was found at a concentration of 4000 mg/kg in soil and 3 milligrams per liter (mg/l) in the groundwater. Benzene was found at a concentration of 44 ug/l in the groundwater. At that time, it was estimated that 20-40 cubic yards of petroleum contaminated soil remained in place. An air sparging/vapor extraction system was installed in 1996 as described in the Remedial System Installation and Monitoring Report, dated 1996. The system operated for several years and multiple Operation and Monitoring Reports were drafted with sample results and system operation evaluations. The system was turned off in April 2001, however monitoring continued throughout 2001. In November 2001, diesel-range organics concentrations in the groundwater continued to exceed the cleanup levels with a sampling result of 140 mg/l, whereas the benzene concentrations were below the cleanup level. Soil samples collected in August 2001 contained diesel-range organics concentrations of 11,000 mg/kg present at 12 feet below ground surface. Results from work that occurred in 2013 and documented in a Decommissioning and Investigation Report (dated November 2013), indicate DRO contamination greater than DEC migration to groundwater cleanup level remains in the soil at the Building 100 AOC and DRO contamination in groundwater greater than the ADEC groundwater cleanup level remains in the Building 100 AOC. The referenced report states all remediation and sampling wells and all monitoring points at the site have been decommissioned. The 2021 Remedial Investigation Report indicated that DRO and total xylenes exceed cleanup levels in soil. Additionally there are indoor air exceedances of benzene, ethylbenzene, naphthalene, total xylenes, and 1,2,4-trimethylbenzene as evidenced by air sampling done in the furnace room of building 100 in 2021. The 2023 Release Investigation and Groundwater Monitoring Work Plan states that indoor air exceedances are from the furnace rather than the contaminated soil. In 2023, an additional monitoring well was installed near building 100. Groundwater was sampled from the new and existing monitoring wells with DRO exceedances at MW-01 (source area) and chloroform exceedances at MW-05. FAA plans to do subsequent groundwater monitoring to assess contaminant concentrations. A cleanup complete determination was issued for Building 102, 9-C-9, and 9-C-10 on February 7, 2017. Remaining contamination concentrations do not pose an unacceptable risk to human health or the environment and no further remedial action will be required unless new information becomes available that indicates residual contaminants may pose an unacceptable risk. The “Cleanup Complete” determination is ONLY for the Source Area 79563 portion of the site and contamination related the Building 102 - Yukon Flats Health Clinic USTs 9-C-9 & 9-C-10. This determination does not affect the portion of the site related to Source Area 78758 and Bldg. 100. The contaminated sites database for entry 740.38.011 will be updated to reflect this in the problem statement and actions sections.

Action Information

Action Date	Action	Description	DEC Staff
7/15/1991	Site Added to Database	A new site has been added to the database (Date adjusted from 4/10/2009 for report/query consistency. (Reese))	Mitzi Read
7/15/1991	Update or Other Action	(Old R:Base Action Code = SA1 - Phase I Site Assessment (General)). Building 300 Floor drain and drum storage area on SE corner of building, and north and west sides of building show contamination. PAHs, heavy metals, and DRPH found at elevated levels. USTs are located at the NE and SE corners of the building. Building 601 Assessment (General)). Contaminated floor drain and drum storage area.	Don Gibler
7/15/1992	Preliminary Assessment Approved	Incinerator at Building 300. Phase I Site Assessment (General)). Soil samples collected next to incinerator concrete pad show dioxin and congeners, elevated levels of copper, lead and zinc.	Don Gibler
10/9/1992	Interim Removal Action Approved	(Old R:Base Action Code = SA1R - Phase I SA Review (CS/LUST)). Building 300 Interim action required of putting removable cap on floor drain. The use of this drum storage area has been discontinued. Asked that R.I. and C.A.P. be prepared ASAP. Building 601Interim action required - discontinue use of floor drain, cap with removable seal, place drums on impermeable liner, place leaking drums in overdrums and dispose of at H.W. facility, follow 18.AAC 68. Do R.I. and prepare C.A.P. ASAP. Building 300 incinerator. Interim Corrective action required: 1) curtail emissions or discontinue use of incinerator. Release investigation and Corrective action required ASAP.	Don Gibler
10/9/1992	Update or Other Action	Received the Environmental Compliance Investigation Report.	Former Staff
5/12/1993	Site Added to Database	Lead, DRPH and PAH contamination.	Former Staff
5/15/1993	Site Ranked Using the AHRM	Initial ranking.	Former Staff
6/29/1994	Update or Other Action	(Old R:Base Action Code = RPL2 - Site Information Request Letter). Sent PRP-CS Database Notification Letter to RP requesting update and more environmental information concerning contaminated site. RP/Jackie for FAA Anchorage office responded to let me know she will be sending information on the facilities soon. Received information on 8-8-94.	Jeff Peterson
8/8/1994	Site Ranked Using the AHRM	Reranked (Based on DDT contaminated soil in addition to CERCLA sources).	Former Staff
11/27/1995	Update or Other Action	Summary of meeting on 11/8/1995 and proposed corrective action approaches at three sites: Installation of bioremediation systems at FAA Fort Yukon Building 100 and the FAA Fort Yukon Health Clinic Building and landspreading of contaminated soils at FAA Fort Yukon RCAG Facility.	Kent Patrick-Riley
11/27/1995	Update or Other Action	FAA Fort Yukon Old FSS Facility located approximately 60 feet east of Building 100 and 20 feet south of the Yukon Flats Health Clinic. Contaminated soils left in place due to structural issues with the FSS building. NFRAP action changed to update on 11/7/02. The building may have been removed and the contaminated soils may be accessible.	Kent Patrick-Riley
1/17/1996	Update or Other Action	Received Underground Fuel Storage Tank (UST) Decommissioning Assessment Report for tanks: 9-C-1 - 9-C-4 at Building 300, 9-C-5 at Building 601, 9-C-7 at Building 100, 9-C-8 at the Old FSS, and 9-C-9 and 9-C-10 at the Yukon Flats Health Clinic. Contamination was left in place at Building 100, the Old FSS, and the Yukon Flats Health Clinic. Confirmation samples were not collected at the depth of the excavation at tank 9-C-3 at Building 300.	Former Staff
7/29/1996	Update or Other Action	Received the Site Cleanup and Investigation Report documenting sampling at Buildings 300 and 601.	Former Staff
7/8/2002	Update or Other Action	Adjusted priority and site location to reflect data provided in reports.	Elizabeth Stergiou
7/9/2002	Site Number Identifier Changed	Workplan changed from 09 to 01 to reflect no presence of hazardous substances above cleanup levels. Sequence Number changed from 04 to 01.	Elizabeth Stergiou
7/16/2002	Update or Other Action	Rec'd Memorandum from FAA consultant titled "Product Baildown Tests and Groundwater Sampling Near Yukon River at FAA Tanana Site, Alaska".	Eileen Olson
9/18/2002	Update or Other Action	Sent letter requesting groundwater monitoring for all existing wells on site, monitoring of the in-situ system, and monitoring of the landspread soil, with a schedule of monitoring to be submitted by March 31, 2003 and the monitoring to be complete by June 30, 2003.	Elizabeth Stergiou
9/19/2002	Update or Other Action	Sent general letter requesting the following documents be submitted by 10/1/02: status of groundwater monitoring and all groundwater monitoring reports since February 12, 1997, status of the in-situ remediation system and associated soil sand groundwater and all associated reports since February 12, 1997, status of the land spread treatment cell and associated soils and groundwater and all associated reports since February 12, 1997, and status of all contaminated sites at the station.	Elizabeth Stergiou
11/21/2005	Update or Other Action	Building 100 Tank 9-C-7: Request for Additional Action. Tank 9-C-7, a 500 gallon heating oil tank, was removed in 1995 and high levels of DRO in soil and groundwater were found. An air sparging/vapor extraction system was installed in 1996 and operated for several years. Elevated levels remain and need to be addressed. Also, the possibility of vapor intrusion into the residence needs to be investigated. ADEC letter sent November 21, 2005.	Anne Marie Palmieri
11/21/2005	Update or Other Action	Building 102 (Yukon Flats Health Clinic): Request for Additional Actions: Tanks 9-C-10 and 9-C-9 were removed in 1995 and elevated levels of DRO were found remaining in place following the removal of some soil. Groundwater contamination was also present. A vapor extraction system was installed and operated for several years. The soil contamination needs to be addressed and the groundwater monitored. DEC also requested that FAA investigate the possibility for vapor intrusion into the clinic building. ADEC letter sent November 21, 2005.	Anne Marie Palmieri
8/31/2006	Site Characterization Workplan Approved	Incinerator: site characterization workplan approved this date. Fieldwork is set to begin 9/7/06.	Anne Marie Palmieri
4/24/2007	Site Characterization Report Approved	The Final Site Investigation Report Federal Aviation Administration Former Incinerator Area Near Building 300, Fort Yukon, Alaska , March 14, 2007 was approved.	Debra Caillouet
4/24/2007	Site Closure Approved	Based on the Final Site Investigation Report Federal Aviation Administration Former Incinerator Area Near Building 300, Fort Yukon, Alaska , March 14, 2007, closure of the incinerator was approved. There are three additional sites within the Quarters facility requiring action and three requiring documentation of ICs to achieve conditional closure.	Debra Caillouet
4/10/2008	Exposure Tracking Model Ranking	Initial ranking with ETM completed.	Debra Caillouet
4/10/2009	Exposure Tracking Model Ranking	Initial ranking with ETM completed for source area id: 78758 name: Bldg 100 UST 9-C-7	Debra Caillouet
4/16/2013	Document, Report, or Work plan Review - other	Draft Work Plan, Federal Aviation Administration, Decommissioning and Investigation, FAA Station Fort Yukon, April 2013	Debra Caillouet
4/16/2013	Document, Report, or Work plan Review - other	ADEC provides comments on the Draft Work Plan, Federal Aviation Administration, Decommissioning and Investigation, FAA Station Fort Yukon, April 2013. Comments letter dated April 16, 2013.	Debra Caillouet
4/30/2013	Document, Report, or Work plan Review - other	Final Work Plan, Federal Aviation Administration, Decommissioning and Investigation, FAA Station Fort Yukon, April 30, 2013. Plan includes a scope of work for the Yukon Flats Health Center (YFHC) and the Quarters Building 100. Contaminants of potential concern include GRO, DRO, RRO, benzene, toluene, ethylbenzene, and xylenes (BTEX), and polynuclear aromatic hydrocarbons (PAHs). At Building 100, DRO has impacted the groundwater and is present in soil above the outdoor air cleanup level. Scope of work includes conducting groundwater sampling to assess petroleum constituents in one monitoring well at each site, assess remaining soil concentrations at the former HOT excavations, and decommission the remediation equipment including SVE and AI wells. Decommissioning activities includes removal and shipment of blower buildings and blowers to Anchorage.	Debra Caillouet
5/9/2013	Document, Report, or Work plan Review - other	ADEC approves the Final Work Plan, Federal Aviation Administration, Decommissioning and Investigation, FAA Station For Yukon, dated April 30, 2013. Approval letter sent out May 9, 2013.	Debra Caillouet
11/12/2013	Document, Report, or Work plan Review - other	Draft Report Federal Aviation Administration Decommissioning and Investigation FAA Station Fort Yukon, October 2013. ADEC provided minor comments to the draft report in a letter dated November 12, 2013.	Debra Caillouet
11/21/2013	Document, Report, or Work plan Review - other	Final Report Federal Aviation Administration Decommissioning and Investigation FAA Station Fort Yukon, November 2013. Report documents the activities and findings of the groundwater and soil sampling and well decommissioning activities performed from June 28 to July 1, 2013. Three wells and two monitoring points were decommissioned at Building 100. Two wells and three monitoring points were decommissioned at the YFHC. Soil samples showed DRO contamination remains in the subsurface soil at the former UST area of concern. DRO contamination greater than the ADEC migration to groundwater cleanup level remains in the soil at Building 100. DRO contamination in groundwater greater than the ADEC groundwater cleanup level remains in the Building 100 AOC. DRO contamination also remains in the soil at the YFHC at concentrations greater than the ADEC migration to groundwater cleanup level.	Debra Caillouet
12/2/2013	Site Characterization Report Approved	ADEC approves the Final Report Federal Aviation Administration Decommissioning and Investigation FAA Station Fort Yukon, Alaska. Approval letter dated December 2, 2013.	Debra Caillouet
12/2/2013	Exposure Tracking Model Ranking	Initial ranking with ETM completed for source area id: 79563 name: Yukon Flats Health Center	Debra Caillouet
1/5/2016	Update or Other Action	Site transferred to PM Garroutte. Next actions are to perform a site review and then confirm site status with the FAA PM.	Monte Garroutte
2/7/2017	Update or Other Action	Clean up complete determination letter issued on February 7, 2017. The “Cleanup Complete” determination is ONLY for the Source Area 79563 portion of the site and contamination related the Bldg 102 - Yukon Flats Health Clinic USTs 9-C-9 & 9-C-10. This determination does not affect the portion of the site related to Source Area 78758 and Bldg. 100. The contaminated sites database for entry 740.38.011 will be updated to reflect this in the problem statement and actions sections.	John O'Brien
6/15/2017	Update or Other Action	DEC sent FAA a memorandum regarding contamination at the Fort Yukon FAA Sites including Quarters Facility Buildings 100, 101, 102, 300, and 601, and associated USTs, Incineration Areas and interior sumps (Hazard IDs 25397,25393,25395, and 25396) to assist FAA with compliance with State of Alaska Contaminated Sites Cleanup Regulations. DEC-required actions for cleanup complete determinations for each AOC were spelled out in detail.	John O'Brien
5/17/2022	Site Characterization Report Approved	Reviewed Report for Building 100, groundwater contamination remains in excess of Table C. Monitoring should continue and an additional well should be installed.	Michael Hooper
6/27/2023	Site Characterization Workplan Approved	Final work plan received on June 27, 2023. This document details the work planned for the Fort Yukon site to take place this July. The sampling efforts will further assess contamination at the Former Living Quarters Building 100 UST 9-C-07 with the installation of a new monitoring well to define the groundwater flow to the north/northeast of the building. Soil samples will be taken from the monitoring well boring and groundwater samples will be taken from the three existing wells and the newly installed monitoring well. The work plan also details the decommissioning of monitoring well MW04 located at Shop Building 300 Former Drum Storage Area. DEC notes that this area was never added to the contaminated sites database as contamination was not found above cleanup levels at this location.	Kelly Ireland
1/8/2024	Site Characterization Report Approved	The document details work done at FAA’s Fort Yukon Facility near buildings 100 and 300. Work was done to delineate contamination and continue long-term monitoring of groundwater at Former Quarters Building 100 UST 9-C-07. A monitoring well, MW04, at Shop Building 300 Drum Storage Area was also successfully decommissioned. At Building 100 a new monitoring well, MW05, was installed in a boring advanced to 20 feet below ground surface. Soil samples from the groundwater interface and from the area with the highest PID screening result from this boring were analyzed for GRO, DRO, RRO, and VOCs. All results were below cleanup levels. Groundwater sampling from MW01, MW03, and MW05 were analyzed for GRO, DRO, RRO, and VOCs. MW02 was not sampled as it was frozen. Groundwater exceeded cleanup levels for DRO at MW01 and chloroform at MW05. This report recommended continued groundwater monitoring to analyze contaminant concentration trends and see if chloroform is present in MW05 again.	Kelly Ireland

Action Date

Action

Description

DEC Staff

7/15/1991

Site Added to Database

A new site has been added to the database (Date adjusted from 4/10/2009 for report/query consistency. (Reese))

Mitzi Read

7/15/1991

Update or Other Action

(Old R:Base Action Code = SA1 - Phase I Site Assessment (General)). Building 300 Floor drain and drum storage area on SE corner of building, and north and west sides of building show contamination. PAHs, heavy metals, and DRPH found at elevated levels. USTs are located at the NE and SE corners of the building. Building 601 Assessment (General)). Contaminated floor drain and drum storage area.

Don Gibler

7/15/1992

Preliminary Assessment Approved

Incinerator at Building 300. Phase I Site Assessment (General)). Soil samples collected next to incinerator concrete pad show dioxin and congeners, elevated levels of copper, lead and zinc.

Don Gibler

10/9/1992

Interim Removal Action Approved

(Old R:Base Action Code = SA1R - Phase I SA Review (CS/LUST)). Building 300 Interim action required of putting removable cap on floor drain. The use of this drum storage area has been discontinued. Asked that R.I. and C.A.P. be prepared ASAP. Building 601Interim action required - discontinue use of floor drain, cap with removable seal, place drums on impermeable liner, place leaking drums in overdrums and dispose of at H.W. facility, follow 18.AAC 68. Do R.I. and prepare C.A.P. ASAP. Building 300 incinerator. Interim Corrective action required: 1) curtail emissions or discontinue use of incinerator. Release investigation and Corrective action required ASAP.

Don Gibler

10/9/1992

Update or Other Action

Received the Environmental Compliance Investigation Report.

Former Staff

5/12/1993

Site Added to Database

Lead, DRPH and PAH contamination.

Former Staff

5/15/1993

Site Ranked Using the AHRM

Initial ranking.

Former Staff

6/29/1994

Update or Other Action

(Old R:Base Action Code = RPL2 - Site Information Request Letter). Sent PRP-CS Database Notification Letter to RP requesting update and more environmental information concerning contaminated site. RP/Jackie for FAA Anchorage office responded to let me know she will be sending information on the facilities soon. Received information on 8-8-94.

Jeff Peterson

8/8/1994

Site Ranked Using the AHRM

Reranked (Based on DDT contaminated soil in addition to CERCLA sources).

Former Staff

11/27/1995

Update or Other Action

Summary of meeting on 11/8/1995 and proposed corrective action approaches at three sites: Installation of bioremediation systems at FAA Fort Yukon Building 100 and the FAA Fort Yukon Health Clinic Building and landspreading of contaminated soils at FAA Fort Yukon RCAG Facility.

Kent Patrick-Riley

11/27/1995

Update or Other Action

FAA Fort Yukon Old FSS Facility located approximately 60 feet east of Building 100 and 20 feet south of the Yukon Flats Health Clinic. Contaminated soils left in place due to structural issues with the FSS building. NFRAP action changed to update on 11/7/02. The building may have been removed and the contaminated soils may be accessible.

Kent Patrick-Riley

1/17/1996

Update or Other Action

Received Underground Fuel Storage Tank (UST) Decommissioning Assessment Report for tanks: 9-C-1 - 9-C-4 at Building 300, 9-C-5 at Building 601, 9-C-7 at Building 100, 9-C-8 at the Old FSS, and 9-C-9 and 9-C-10 at the Yukon Flats Health Clinic. Contamination was left in place at Building 100, the Old FSS, and the Yukon Flats Health Clinic. Confirmation samples were not collected at the depth of the excavation at tank 9-C-3 at Building 300.

Former Staff

7/29/1996

Update or Other Action

Received the Site Cleanup and Investigation Report documenting sampling at Buildings 300 and 601.

Former Staff

7/8/2002

Update or Other Action

Adjusted priority and site location to reflect data provided in reports.

Elizabeth Stergiou

7/9/2002

Site Number Identifier Changed

Workplan changed from 09 to 01 to reflect no presence of hazardous substances above cleanup levels. Sequence Number changed from 04 to 01.

Elizabeth Stergiou

7/16/2002

Update or Other Action

Rec'd Memorandum from FAA consultant titled "Product Baildown Tests and Groundwater Sampling Near Yukon River at FAA Tanana Site, Alaska".

Eileen Olson

9/18/2002

Update or Other Action

Sent letter requesting groundwater monitoring for all existing wells on site, monitoring of the in-situ system, and monitoring of the landspread soil, with a schedule of monitoring to be submitted by March 31, 2003 and the monitoring to be complete by June 30, 2003.

Elizabeth Stergiou

9/19/2002

Update or Other Action

Sent general letter requesting the following documents be submitted by 10/1/02: status of groundwater monitoring and all groundwater monitoring reports since February 12, 1997, status of the in-situ remediation system and associated soil sand groundwater and all associated reports since February 12, 1997, status of the land spread treatment cell and associated soils and groundwater and all associated reports since February 12, 1997, and status of all contaminated sites at the station.

Elizabeth Stergiou

11/21/2005

Update or Other Action

Building 100 Tank 9-C-7: Request for Additional Action. Tank 9-C-7, a 500 gallon heating oil tank, was removed in 1995 and high levels of DRO in soil and groundwater were found. An air sparging/vapor extraction system was installed in 1996 and operated for several years. Elevated levels remain and need to be addressed. Also, the possibility of vapor intrusion into the residence needs to be investigated. ADEC letter sent November 21, 2005.

Anne Marie Palmieri

11/21/2005

Update or Other Action

Building 102 (Yukon Flats Health Clinic): Request for Additional Actions: Tanks 9-C-10 and 9-C-9 were removed in 1995 and elevated levels of DRO were found remaining in place following the removal of some soil. Groundwater contamination was also present. A vapor extraction system was installed and operated for several years. The soil contamination needs to be addressed and the groundwater monitored. DEC also requested that FAA investigate the possibility for vapor intrusion into the clinic building. ADEC letter sent November 21, 2005.

Anne Marie Palmieri

8/31/2006

Site Characterization Workplan Approved

Incinerator: site characterization workplan approved this date. Fieldwork is set to begin 9/7/06.

Anne Marie Palmieri

4/24/2007

Site Characterization Report Approved

The Final Site Investigation Report Federal Aviation Administration Former Incinerator Area Near Building 300, Fort Yukon, Alaska , March 14, 2007 was approved.

Debra Caillouet

4/24/2007

Site Closure Approved

Based on the Final Site Investigation Report Federal Aviation Administration Former Incinerator Area Near Building 300, Fort Yukon, Alaska , March 14, 2007, closure of the incinerator was approved. There are three additional sites within the Quarters facility requiring action and three requiring documentation of ICs to achieve conditional closure.

Debra Caillouet

4/10/2008

Exposure Tracking Model Ranking

Initial ranking with ETM completed.

Debra Caillouet

4/10/2009

Exposure Tracking Model Ranking

Initial ranking with ETM completed for source area id: 78758 name: Bldg 100 UST 9-C-7

Debra Caillouet

4/16/2013