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Site Report: Wildwood AFS ACS MARS Facility Quonset Hut

Site Name: Wildwood AFS ACS MARS Facility Quonset Hut
Address: 3.5 Mile North Kenai Road, Wildwood Drive, Kenai, AK 99611
File Number: 2320.38.051
Hazard ID: 25210
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 60.584339
Longitude: -151.282840
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

The Quonset Hut structure, metal debris, and chain-link fence were removed in 1996. Ash within the burned Quonset Hut was also removed.Approximately 37 cubic yards of petroleum-contaminated soil was removed from two locations at the Quonset Hut source area during summer 1996. Stained soil was removed from the upper one foot near the southwest corner of the Quonset Hut. Field screening results support this stained soil was fully removed. Additionally, stained soil was excavated to 9 feet bgs from the former AST location. Two confirmation samples from the base of the excavation contained 2,800 and 5,900 mg/kg of DRO.Based on the available information, petroleum-contaminated soil remained at 9 feet bgs at the former AST area south of the former Quonset Hut that exceeded the cleanup target for DRO. This remaining contaminated soil existed at or below the groundwater table. Groundwater at that location was impacted above the cleanup target. Contaminants of Concern: The contaminant of concern remaining in soil at this source area is DRO. Contaminants of concern remaining in groundwater at this source area are DRO and TRPH.

Action Information

Action Date Action Description DEC Staff
9/1/1991 Update or Other Action (Old R:Base Action Code = SI - Site Investigation). SI action added by Shannon and Wilson on 3/13/97, based on FUDS Site Summary dated 2/21/96. Summary shows the SI completed 09/09/91. SI for transformers, tanks, pressurized gas cylinders. S&W-Miner
9/1/1991 Site Added to Database (Date adjusted from 11/10/1999 for report/query consistency. (Reese)) John Halverson
8/17/1993 Update or Other Action (Old R:Base Action Code = RIFS - Remedial Investigation / Feasibility Study). RIFS action added by Shannon and Wilson on 3/13/97, based on FUDS Site Summary dated 2/21/96. Summary shows the RIFS completed 08/17/93. RIFS for Phase III Remedial Investigation including safety plan, work plan, QAP, SAP, field sampling and monitoring wells. DO#9 tasked E&E with development of disposal options for 23 drums of dioxin. S&W-Miner
11/15/1993 Update or Other Action (Old R:Base Action Code = RD - Remedial Design). RD action added by Shannon and Wilson on 3/13/97, based on FUDS Site Summary dated 2/21/96. Summary shows the RD completed 11/15/93. RD for transformers, tanks, pressurized gas cylinders. S&W-Miner
9/30/1994 Update or Other Action (Old R:Base Action Code = RA - Remedial Action). RA action added by Shannon and Wilson on 3/13/97, based on FUDS Site Summary dated 2/21/96. Summary shows the RA completed 09/30/94. RA for IRA of 12 USTs and piping, soil and liquid samples, tank cleaning and field screening at 4 of the tanks. Scheduled completion 15 October 1994. S&W-Miner
9/30/1994 Update or Other Action (Old R:Base Action Code = RD - Remedial Design). RD action added by Shannon and Wilson on 3/13/97, based on FUDS Site Summary dated 2/21/96. Summary shows the RD completed 09/30/94. RD for structures and debris removal. Dioxin-contaminated building. S&W-Miner
2/21/1996 Update or Other Action (Old R:Base Action Code = RD - Remedial Design). RD action added by Shannon and Wilson on 3/13/97, based on FUDS Site Summary dated 2/21/96. Summary shows the RD for implementation of RI workplan, risk assessment, RA alternatives and design of soil remediation. S&W-Miner
4/18/1996 Proposed Plan The Corps finalized the proposed plan. Preferred alternatives included: Main Complex tank farm and USTs 5-1 and 5-2 - vapor extraction and air sparging; Maintence Bld, ACS MARS, Quonset Hut and Disposal Trench Area Burn Pit - soil excavation and off-site treatment followed by no further action; Operations Building - excavation and off-site treatment followed by natural attenuation and institutional controls; Landfill and Disposal Trenches - capping, natural attenuation (landfill area only) and institutional controls. John Halverson
6/3/1996 Update or Other Action Received a groundwater monitoring report for tank farm area from sampling in August 1995. It covered the main complex area tank farm and USTs (significant fuel contamination), ACS/MARS facility (low level DRO), Operations Building (DRO and low TEX), Landfill (low level VOCs) and Trench disposal areas (DRO and benzene at burn pit area). John Halverson
8/27/1996 Update or Other Action Received the December 1995 groundwater monitoring event report. It covers the tank farm area and former USTs at the main complex (significant petroleum contamination in GW at and downgradient from tank farm), the ACS MARS facility and Quonset Hut area (low level DRO in GW), the Operation Building (DRO and TEX in GW), Landfill (low level VOCs) and Trench Disposal Areas (DRO, benzene at burn pit area). John Halverson
11/22/1996 Interim Removal Action Approved Received final "Remedial Action Report Interim Removal Action, Wildwood AFS" by Harding and Lawson Assoc., October 28, 1996. Conclusions, based on confirmation samples at the end of the removal, include: ACS Mars - UST 250 and 253 meet cleanup levels, UST 251 did not (DRO 500 -3,400 mg/kg in soil); Quonset Hut Area - DRO 2,800 - 5,900 in soil; Trench Area Burn Pit - DRO 12,00 - 18,000 mg/kg; Main Complex - Building 55 and Drum Storage Area met cleanup levels; High Frequency Facility - up to 4,500 mg/kg DRO remains. John Halverson
2/3/2005 Update or Other Action File number issued 2320.38.051 Aggie Blandford
11/8/2005 GIS Position Updated Using Figure 2-3 from a Remedial Investigation Report Phase III Cleanup Design Wildwood Air Force Station, in conjunction with TopoZone Pro and the KPB Parcel Lookup, entered the coordinates for this site. Metadata includes No Topo Basemap, TopoZone Pro Street Maps, Black and White Aerial Photo, on a Medium Size Map, View Scale 1:10,000, Coordinate Datum NAD83. High degree of confidence in accuracy of location. Former Staff
6/15/2007 Update or Other Action The Declaration of Project Closure Decison for the CON/HTRW project at Wildwood was signed. Debra Caillouet
9/23/2008 Site Added to Database A new site has been added to the database Mitzi Read
9/26/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 78525 name: Quonset Hut Debra Caillouet
11/16/2009 Site Characterization Workplan Approved Final Work Plan, Soil Assessment and Groundwater Monitoring of Non-Tank Farm Sites, Former Wildwood Air Force Station, Kenai, November 2009 will sample groundwater at the site. Debra Caillouet
6/4/2010 Document, Report, or Work plan Review - other 2009 Report Soil Assessment and Groundwater Monitoring of Non-Tank Farm Sites Former Wildwood Air Force Station, FUDS The results of the chemical analyses were compared to Table C of the ADEC Title 18, Alaska Administrative Code, Chapter 75.345 (18 AAC 75.345), Oil and Hazardous Substances Pollution Control. DRO and GRO results reported in the 1995 RI (field and off-site laboratory results) and the results from the 2009 sampling event are compared in Figure 3-1. In the 1995 RI, DRO was reported above cleanup level at the former AST location (AP-497; 9,980 µg/L). However, since the 1996 removal of 37 cubic yards of POL-contaminated soil from the AST area, the DRO concentration in groundwater has decreased significantly and is now detected well below cleanup level. Complete analytical results (Table B3) and a sample tracking table (Table B1) are presented in Appendix B. Groundwater sample results are summarized below. • DRO was detected in all four wells at concentrations two orders of magnitude less than the ADEC cleanup level of 1,500 micrograms per liter (µg/L). • GRO was not detected in wells at the Quonset Hut site. Debra Caillouet
5/30/2013 Cleanup Plan Approved Soil Removal and Confirmation Sampling Plan prepared by the Kenaitze Indian Tribe approved. Debra Caillouet
10/19/2016 Cleanup Complete Determination Issued Submit Site Closure letter (Cleanup Complete Determination) to the Kenaitze Indian Tribe for the Wildwood FUDS Quonset Hut site. Excavation of contaminated soil occurred in 2013 and 2014. 2009 ground water monitoring did not identify exceedance of CoC's. Guy Warren

Contaminant Information

Name Level Description Media Comments
DRO < Method 2 Most Stringent Soil Contaminated soil has bee excavated and all confirmation samples are below Method 2.

Control Type

Type Details
No ICs Required

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.
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)

No associated sites were found.

Missing Location Data

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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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