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Site Report: Clear SFS Site 06 WP006

Site Name: Clear SFS Site 06 WP006
Address: between construction camp, and composite building, Clear, AK 99704
File Number: 151.38.001
Hazard ID: 4175
Status: Active
Staff: Tim Sharp, 9074512131 tim.sharp@alaska.gov
Latitude: 64.289441
Longitude: -149.157192
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

Site 6 is the historic sludge pit associated with the station sewage treatment plant. The treatment plant is located halfway between the construction camp and the composite area and consists of an Imhoff tank, leach field and the sludge pit. The sludge pit has now been replaced by a lined drying bed. Before the costruction of the new lined drying bed, sludge from the Imhoff tank was pumped to the unlined sludge pit and allowed to dewater prior to disposal in the station landfill. Surface soil sampling at Site 6, Abandoned Sludge Pit, detected maximum levels of polychlorinated biphenyls (PCBs) – 183 mg/kg, 4-chloroaniline – 5.7 mg/kg, mercury – 9.9 mg/kg, cadmium – 7.4 mg/kg, lead – 630 mg/kg, selenium – 21 mg/kg, barium – 2600 mg/kg, chromium – 71 mg/kg, silver – 28 mg/kg, and arsenic – 15 mg/kg.

Action Information

Action Date Action Description DEC Staff
6/1/1990 Update or Other Action In 1990 a decision document was issued by the Air Force that reported a well had been installed downgradient of the site that was sampled three times in 1988 and 1989 with a trace detection of tetrachlorethene in 1988. Debra Caillouet
11/8/2005 Update or Other Action A comment letter was submitted to the AF regarding the site summaries for 23 IRP sites at Clear. Site 6 (WP006) is the historic sludge pit associated with the station's sewage treatment plant. The sludge pit has been replaced with a lined dry bed in the same location. No records have been found of soil sampling and analysis for this site. One monitoring well was installed downgradient and sampled three times in the late 1980's. The results showed one low level detection of tetrachloroethene (0.64ìg/L) and one of petroleum hydrocarbons at 14,000 ìg/L, which was attributed to the steel well caseing. The Air Force is proposing to perform a Site Inspection (SI) to determine if metals, chlorinated solvents, polychlorinated biphenyls, diesel range organics (DRO), and gasoline range organics (GRO) have migrated to groundwater. DEC requests that in addition to the groundwater evaluation that the soil surrounding the current lined sludge pit be sampled and analyzed for these potential contaminants as well. The results of the soil sampling would be used to determine if any institutional controls would be needed to prevent risk to human health and the environment. Debra Caillouet
12/1/2005 Site Added to Database Site added to the database. Debra Caillouet
2/2/2006 Update or Other Action The Alaska Department of Environmental Conservation received the Draft Preliminary Findings Report Sites 6, 7, and 17 on January 27, 2006. The report describes the results of sampling and analysis from the fieldwork in October 2005 and proposes modifications to the work planned for the spring of 2006 based on the preliminary findings. The following comment on the report for Site 6 was sent to the AF. Surface soil sampling at Site 6, Abandoned Sludge Pit, detected maximum levels of polychlorinated biphenyls (PCBs) – 183 mg/kg, 4-chloroaniline – 5.7 mg/kg, mercury – 9.9 mg/kg, cadmium – 7.4 mg/kg, lead – 630 mg/kg, selenium – 21 mg/kg, barium – 2600 mg/kg, chromium – 71 mg/kg, silver – 28 mg/kg, and arsenic – 15 mg/kg. The work plan identified one sludge pit for sampling but it appears that the field reconnaissance determined that there are two pits separated by a berm. Please confirm this and clarify in the text. The recommendations for Site 6 are to collect an additional four surface soil samples in the second sludge pit, three surface soil samples around the current sludge-drying area and to install and sample a monitoring well downgradient of the abandoned sludge pit. DEC requests the addition of subsurface sampling in the abandoned sludge pits to estimate the depth of soil contamination. Debra Caillouet
5/25/2006 Update or Other Action A response to comments for the Draft Preliminary Findings Report for Sites 6,7 and 17 indicates that Sites 6 and 17 based on the findings will go to a full Remedial Investigation and a work plan will be prepared for field work in 2007. No additional SI work will occur for Site 6 Debra Caillouet
1/22/2007 Update or Other Action the project manager and risk assessor provided comment on the draft RI and risk assessment work plan for sites 6 & 17 Debra Caillouet
3/22/2007 Exposure Tracking Model Ranking Debra Caillouet
3/22/2007 Site Characterization Workplan Approved The work plan for sites 6 & 17 was approved. Debra Caillouet
1/28/2008 Update or Other Action The project manager and risk assessor provided comment on the RI report and risk assessment Debra Caillouet
8/19/2008 Update or Other Action The ADEC received an updated Community Involvement Plan for the Environmental Restoration Program at Clear Air Force Station. Debra Caillouet
10/2/2008 Document, Report, or Work plan Review - other comments were sent to the Air Force on the draft Feasibility Study Debra Caillouet
11/19/2008 Document, Report, or Work plan Review - other Staff provided comment on the ACLs shown in the draft final FS. They need tobe recalculated and submitted for review before adjusting the FS. Debra Caillouet
2/6/2009 Document, Report, or Work plan Review - other The Final Feasibility Study was approved. Debra Caillouet
6/8/2009 Update or Other Action Comments were sent to the Air Force on a draft proposed plan. Debra Caillouet
8/12/2009 Proposed Plan The final proposed plan was approved Debra Caillouet
5/21/2010 Document, Report, or Work plan Review - other The final 2009 well decommissioning report documents the proper closure of 55 wells throughout the base. It recommends an additional 20 wells be decommissioned. Debra Caillouet
8/24/2010 CERCLA ROD Approved The final ROD was signed by DEC 5/27/2010 and by the AF 7/23/2010. The remedy is to excavate PCB soil to 25 ppm and then cap the area. LUCs will restrict the site to industrial use. Debra Caillouet
3/22/2011 Document, Report, or Work plan Review - other Draft Remedial Action Work Plan, Sites 6 and 13, Clear Air Force Station, February 2011 Debra Caillouet
6/14/2011 CERCLA Remedial Design/Remedial Action Plan Approved Final Remedial Action Work Plan, Sites 6 and 13, Clear Air Force Station, May 2011 Debra Caillouet
1/20/2012 Document, Report, or Work plan Review - other Draft Remedial Action Report, Sites 6 and 13, Clear Air Force Station, December 2011 Debra Caillouet
10/11/2012 Cleanup Complete Determination Issued The Final Remedial Action Report, Sites 6 and 13 documents the removal of PCB and lead contaminated soil, the installation of a soil cap and a fence. Debra Caillouet
10/11/2012 Institutional Control Record Established Institutional Controls established and entered into the database. Debra Caillouet
8/16/2013 Document, Report, or Work plan Review - other The Final Work Plan/Quality Assurance Project Plan Site WP006, Performance Based Remediation, Clear AFS, August 2013 was not approved. Debra Caillouet
9/10/2013 CERCLA Remedial Design/Remedial Action Plan Approved Final Work Plan/Quality Assurance Project Plan Site WP006, Performance Based Remediation, Clear AFS, Debra Caillouet
5/22/2014 Enforcement Action A compliance advisory letter was sent to Weston and AECOM for not following their work plan, for transporting soil in uncovered loads and without ADEC approval for disposal. Debra Caillouet
6/12/2014 Site Reopened The Air Force has determined that it wants unrestricted use for this site. An Explanation of Significant Difference was signed by ADEC today. Debra Caillouet
8/7/2015 Update or Other Action Several Reports for this file are at Alaska Archives for storage. I am including the barcodes if you need any pulled from there. Please see list of contents in each box to find what you're looking for before requesting any box retrievals. Thank you Barcode 795756 Box 385 Barcode: 587281 Box 348 587285 Box 352 795754 Box 383 795753 Box 382 795757 Box 386 795755 Box 384 Susan Carberry
8/15/2016 Document, Report, or Work plan Review - other DEC has completed review of the Draft Final Remedial Action Completion Report, Site WP006, Clear AFS, Alaska, dated July, 2016. Monte Garroutte
10/13/2016 CERCLA Remedial Action Completion Report DEC approved the Remedial Action Completion Report, Site WP006. The objective of this effort was to remove contaminated soils with concentrations above the DEC-approved project action limits (PALs). This involved: Removing overburden surface materials from 0-6 ft bgs; removing the soil horizon from 6-8 ft bgs and stockpiling into windrows for further assessment; excavating soil below the 8 ft bgs soil horizon; field screening the excavation for lead; collecting confirmation samples from the excavation base and sidewalls; and decommissioning four groundwater monitoring wells. All contaminated soils above project action limits were removed from the site and monitoring wells were decommissioned in accordance with DEC regulations. Following the removal activities, PCBs were detected at concentrations above the DEC Method Two cleanup level in two Multi-Increment samples collected outside of the WP006 site boundary near the windrow stockpile staging area. A new site inspection was recommended for the stockpile area. Monte Garroutte
5/1/2017 Cleanup Complete Determination Issued Monte Garroutte
6/21/2017 Institutional Control Record Removed Institutional Controls have been removed. Monte Garroutte
6/21/2017 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 75146 leachfield. Monte Garroutte
10/22/2021 Site Reopened Site WP006 has been reopened by USAF. A site investigation is planned to investigate PCB contamination at the former WP006 stockpile and at locations parallel to the railroad track. Jamie McKellar
5/24/2022 Site Visit On 5/23/2022, Contaminated Sites and Solid Waste staff conducted the annual inspection at Clear Space Force Station. CS staff visited Site SS024 and observed pre-characterization test-pitting in prep for a construction project. Sites WP006, TU026, and AFFF Area #5 were also observed. Jamie McKellar
4/30/2024 CERCLA RI Plan Approved UFP-QAPP Approved: Final Unified Federal Policy-Quality Assurance Project Plan, Per- and Polyfluoroalkyl Substances Phase I Remedial Investigation at Sites AT029P, AT030P, FT010P-SUB, WP006P-SUB, and SS028P, Clear Space Force Station, Alaska. This document describes the proposed management and field sampling approach to be used during a Phase 1 Remedial Investigation for per- and polyfluoroalkyl substances (PFAS) at the five sites listed above. The United States Air Force (USAF) has committed to conduct the required baseline risk assessment under a separate contract. Jamie McKellar
5/12/2025 CERCLA RI Report Approved DOCUMENT APPROVED: Post Mobilization (MOB) II Fieldwork Update and Proposed Optimization of the MOB III Fieldwork for the Per- and Polyfluoroalkyl Substances (PFAS) Phase I Remedial Investigation (RI) at Sites AT029P, AT030P, FT010P-SUB, WP006P-SUB, and SS028P at Clear Space Force Station, Alaska. This MOB 2 update proposes to update PSLs based on the January 2025 Memo from the Office of the Assistant Secretary of Defense, and summarizes findings from MOB 2. In its approval, DEC requested a meeting to discuss placement of permanent monitoring wells during MOB 3 and a meeting prior to MOB 4 to discuss MOB 3 results. Finally, DEC requested that USAF submit the MOB 3 update document a minimum of 30 days before MOB 4 is scheduled to begin. Jamie McKellar

Contaminant Information

Name Level Description Media Comments
Lead - Total < Method 2 Most Stringent Soil
Mercury - Total < Method 2 Most Stringent Soil
PCBs - Total < Method 2 Most Stringent Soil
4-Chloroaniline < Method 2 Most Stringent Soil

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)
Hazard ID Site Name File Number
26957 Clear SFS AFFF Area #5 Sludge Drying Bed/Pit and Leach Field 151.38.009

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
TDD: 800-770-8973
Physical Location: 410 Willoughby