Division of Spill Prevention and Response

Breadcrumbs

Site Report: North River RRS Area A SS003


Site Name: North River RRS Area A SS003
Address: 12 Miles from Unalakleet on Gravel Road, Apron Edge & North Site of Main Road, Unalakleet, AK 99684
File Number: 630.38.001
Hazard ID: 4365
Status: Active
Staff: Joy Whitsel, 9074512156 joy.whitsel@alaska.gov
Latitude: 63.883498
Longitude: -160.533892
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

Area A consists of soil contaminated PCBs and diesel and residual range organics that were spilled off of the edge of an apron pushed out on the north side of the main site road. Nine, 55-gallon drums were removed in 2003. Some soil was removed during the drum removal, documented in the Time-Critical Removal, North River (former) Radio Relay Site, Alaska. Approximately 340 cubic yards of petroleum and PCB contaminated soil remains above the cleanup criteria. In 2007, soil borings were advanced in an effort to collect groundwater samples, however, refusal was encountered in all borings prior to encountering groundwater. A Record of Decision (ROD) was signed on September 13, 2010. The ROD describes the Air Forces proposed remedy for this site as excavation and offsite disposal. The goal of the proposed remedial action is to completely remove PCB contaminated soil above 1.0 mg/kg. The Method 2 Ingestion cleanup levels are the proposed cleanup level for POL contaminated soil. The remedial action is scheduled for 2011.



Action Information

Action Date Action Description DEC Staff
3/23/2007 Site Added to Database Site added to the database. Mitzi Read
3/27/2007 Exposure Tracking Model Ranking Initial ranking. Lisa Maserjian
6/18/2007 Meeting or Teleconference Held See meeting notes under the OTOO1 sitewide entry. Lisa Maserjian
9/15/2008 Site Characterization Report Approved Approved the August 2008 Final Site Characterization and Remedial Investigation Report, Jacob estimates that approximately 317 cy of POL and 340 cy of PCB contaminated soil will need to be removed from this area located north of the site access road. Most of the PCB and POL contaminated soil is co-located. Kim DeRuyter
3/20/2009 Long Term Monitoring Established Staff met with the Air Force and their contractor to discuss a Tech Memo, and the path forward for the North River Radio Relay Station site. The Air Force proposed further excavation and off site disposal for this site. Kim DeRuyter
9/13/2010 CERCLA ROD Approved A Record of Decision (ROD) was signed on September 13, 2010. The ROD describes the Air Forces proposed remedy for this site as excavation and offsite disposal. The goal of the proposed remedial action is to completely remove PCB contaminated soil above 1.0 mg/kg. The Method 2 Ingestion cleanup levels are the proposed cleanup level for POL contaminated soil. The remedial action is scheduled for 2011. Kim DeRuyter
7/14/2011 CERCLA Remedial Design/Remedial Action Plan Approved The Quality Assurance Project Plan has been submitted and is currently under revision to incorporate the Departments comments. The plan for SS003 is excavation and off site disposal of PCB and petroleum and PCB co-mingled contamination. The excavation will continue until all contaminants concentrations detected in confirmation samples have met the cleanup level. The site will be graded to fit the surrounding contours. Kim DeRuyter
12/8/2011 Update or Other Action Due to unforseen delays, the Area A cleanup work described in the 2011 work plan was not initiated in 2011. The cleanup is anticipated to commence in 2012 provided funding is available. Kim DeRuyter
3/23/2012 Update or Other Action Project manager changed from DeRuyter to Dooley. Rebecca Bryan
5/24/2012 Report or Workplan Review - Other ADEC recieved the draft PCB Soil Removal QAPP Revision 1 on May 14 and sent comments on May 23. A removal action is planned for all contaminated soil above cleanup levels. Meghan Dooley
3/27/2014 Update or Other Action PCBs above cleanup levels remain on bedrock in Areas A and C at depths of 8 to 19 feet bgs; ROD amendment will be needed to allow site closure with ICs. March 27, 2014, meeting between ADEC, USAF, and Jacobs. In this meeting it was decided that the ROD amendment process will be undertaken in 2015. A work plan will be drafted for work to be conducted during the 2014 field season and a community meeting will be scheduled to get community input on the draft. The work plan will include: 1) installing groundwater monitoring wells at Area C and conducting GW sampling; 2) removing 1,2,4-TCB from two grids and a bedrock ridge, if possible, in Area C; 3) excavation of the floor of grid 31I in the WACS area for remaining PCBs;backfilling Areas A and C; 4) further investigation for DROs and RROs at the drum site south of the cabin; 5) removing contaminated soils from the VMF area and land farming them at the WACS site; and 6) transporting the 640+ super sacks down to Unalakleet. Meredith Savage
5/6/2014 Meeting or Teleconference Held Public meeting held at 1:00pm in the Village of Unalakleet to discuss data from 2013 field season and field work proposed for 2014. Attending: Meredith Savage-ADEC,Robert Johnston-USAF, Jennifer Anderson and Forrest Janukajtis-Jacobs Engineering. Discussion was held with community members regarding the information that PCB concentrations above ADEC Table B1, Method 2 cleanup levels still remain onsite at bedrock level at Area A and Area C. Community members voiced concern over the potential that those PCBs would migrate down gradient via groundwater and indicated they would like to see cleanup at site continue. Community members also asked that vegetation be sampled for PCBs. It was agreed that although Areas A and C are at bedrock, additional cleanup efforts would take place this summer, as well as installation of groundwater monitoring wells. Vegetation sampling would be considered. Meredith Savage
5/13/2014 Report or Workplan Review - Other ADEC approves as final North River Radio Relay Station 2013 Cleanup Report for PCB- and POL Contaminated Soils. Meredith Savage
7/14/2014 Report or Workplan Review - Other Provided comments on Soil Delineation and Drum Removal Work Plan Addendum, received electronically on 7/01/2014. The work plan a)proposes additional sampling in the location of a 55-gallon drum that was found (and removed) from near Area C in August of 2013, and b)proposes to sample and remove any other USAF drums found in the general area of the site. Meredith Savage
7/29/2014 Report or Workplan Review - Other Received the draft Vegetation Sampling Work Plan Addendum to the North River Radio Relay Station Cleanup Plan for PCB-Contaminated Areas. The work plan describes the project approach and methodology for sampling vegetation ant Site SS001 (Area C) and SS003 (Area A). Meredith Savage
8/4/2014 Report or Workplan Review - Other Comments provided the draft Vegetation Sampling Work Plan Addendum to the North River Radio Relay Station Cleanup Plan for PCB-Contaminated Areas. Meredith Savage
8/7/2014 Report or Workplan Review - Other Received final Soil Delineation and Drum Removal Work Plan Addendum to North River RRS Cleanup Plan for PCB-Contaminated Areas; work plan approved as final. Meredith Savage
8/7/2014 Report or Workplan Review - Other Received final Vegetation Sampling Work Plan Addendum to North River RRS Cleanup Plan for PCB-Contaminated Areas; work plan approved as final. Meredith Savage
5/20/2015 Report or Workplan Review - Other The Alaska Department of Environmental Conservation (ADEC) received an electronic copy of the document titled 2014 North River Radio Relay Station Site Activities Technical Memorandum on May 19, 2015. The document describes the vegetation sampling, drum investigation, and excavation activities at the North River Radio Relay Station (RRS) site during the 2014 field season. Vegetation sampling was conducted to address concerns raised by the community of Unalakleet about the potential for polychlorinated biphenyl (PCB) contamination in vegetation and to evaluate the potential for transmission through the food chain. Samples were collected from the roots, leaves, and fruits of various plants in the vicinity of the Site SS003 (Area A) excavation, in the vicinity of the Site SS001 (Area C) excavation, and along the ATV trail to the recreational cabin located to the southeast of the Area C excavation. Of the 111 total samples, 88 of the samples had no detection of PCBs and the remaining samples had detections that were less than the PCB soil cleanup level of 1 mg/kg. Detections were limited to root samples and one leaf sample; the highest detection was 0.44 mg/kg. The site of a drum removed in 2013 was sampled for petroleum hydrocarbon contamination. ADEC Method Two Soil Cleanup Levels were exceeded for diesel range organics (DRO) in each of the four samples. Because of suspected biogenic interference (organic matter), a silica gel cleanup was run on the samples and although the results showed that DRO concentrations for the four samples were below soil cleanup levels, a recommendation was made that 1.5 cubic yards of soil be removed from the vicinity of the drum during the 2015 field season and that no further investigation is required. Analytical results from the 2013 remedial action activities at Site OT001 (WACS) showed one remaining small area of PCB concentration exceeding the 1mg/kg soil cleanup level (a 1.18 mg/kg result). The contaminated soil was removed and confirmation sample results were below the soil cleanup levels for PCB. With this action all PCB-contaminated soil has been removed from Site OT001 (WACS), no further remediation is necessary, and site closure is recommended. ADEC has reviewed this report and accepts it as final. Meredith Savage
6/8/2015 Update or Other Action Received draft Technical Memorandum titled "Backfill and Restoration for Site SS003 (Area A) and SS001 (Area C)Work Plan, North River Radio Relay Station (RRS). Meredith Savage
6/18/2015 Report or Workplan Review - Other The Alaska Department of Environmental Conservation (ADEC) received an electronic copy of a document titled Backfill and Restoration for Site SS003 (Area A) and SS001 (Area C) Work Plan, North River Radio Relay Station (Final) on June 17, 2015. The work plan describes the project approach and methods to be used to backfill the excavations at Site SS001 (Area C) and Site SS003 (Area A). Contamination with polychlorinated biphenyls (PCB) and residual range organics (RRO) remains at bedrock approximately 17 feet below ground surface (bgs) at Area A. Concentrations of the remaining PCBs exceeding the cleanup level of 1 mg/kg range from 1.1 to 320.30 mg/kg, and the concentration of the remaining RRO exceeding the cleanup level of 10,000 mg/kg is up to 41,000 mg/kg. Due to depth and presence of fractured bedrock, no further excavation was recommended for Area A. Contamination with PCB and 1,2,4-trichlorobenzene (TCB) remains in Area C at approximately 10 feet bgs (on floor-PCB) and 8 feet bgs (on sidewalls-TCB). Concentrations of PCBs exceeding cleanup level range from 3.58 to 119.05 mg/kg. The concentration of TCB exceeding the cleanup level of 0.85 mg/kg ranges from 4.8 to 9.4 mg/kg. Excavation at Area C was discontinued due to the presence of groundwater and bedrock. Both sites will be restored to surrounding grade and seeded using an arctic grow mix to aid in minimizing erosion. ADEC has reviewed this report and accepts it as final. Meredith Savage
8/6/2015 Update or Other Action Transferred entire file (3 large boxes) to Fairbanks on 8/7/2015 Cert Return Receipt # 7015 0640 0006 5878 3860- 7015 0640 0006 5878 3877 7015 0640 0006 5878 3891 Susan Carberry
10/30/2015 Site Visit Conducted site visit of Areas A and C and the VMF in coordination with the Oct 29 public RAB meeting. Area A had been backfilled and graded to match surrounding topography, and a vegetation cap consisting of seeded grass had been partially established prior to the ground freezing. Joy Whitsel
7/22/2016 Report or Workplan Review - Other DEC approved 2015 Site Activities Report, which included the following work at each site: - OT001 (WACS): construction and maintenance of the landfarm for petroleum, oil and lubricants (POL) contaminated soil. - SO001 (VMF): excavating POL-contaminated soil and transporting this soil to the landfarm at Site OT001, collection of soil samples, and installation and sampling of groundwater monitoring wells. All groundwater results were below DEC cleanup levels. - SS001 (Area C): lining and backfilling the existing excavation, drilling, and site restoration; installation and sampling of groundwater monitoring wells. All groundwater results were below DEC cleanup levels. - SS003 (Area A): lining and backfilling the excavation, drilling, and site restoration; soil sampling. All soil results were less than ADEC cleanup levels, which indicates no contamination is present downgradient. Joy Whitsel
9/20/2016 Site Visit DEC Project Manager (PM) attended public Restoration Advisory Board (RAB) meeting on 9/20 where US Air Force (USAF) and their contractor provided update of work completed in 2016, including landfarming, excavation and stockpiling of approximately 3,000 cy of petroleum-contaminated soil, and groundwater monitoring. On 9/21, the DEC PM, USAF PM, and contractors conducted a field visit to observe the work completed over the summer at the VMF, landfarm, and Area C, and to check on vegetative re-growth at the sites closed with institutional controls – Areas A and B. Re-growth at Area B is robust; re-growth at Area A is patchy due to large amounts of gravel in the surface soil. Joy Whitsel

Contaminant Information

Name Level Description Media Comments


Control Type

Type Details


Requirements

Description Details

There are no documents for this site report.