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Site Report: AKARNG Stebbins FSA


Site Name: AKARNG Stebbins FSA
Address: Unnamed Road, Stebbins, AK 99671
File Number: 650.38.002
Hazard ID: 3095
Status: Cleanup Complete
Staff: ,
Latitude: 63.524295
Longitude: -162.291149
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

Petroleum contamination in soil.

Action Information

Action Date Action Description DEC Staff
1/30/1998 Update or Other Action Received Preliminary Assessment/Site Investigation report prepared by Ogden Environmental. Scott Pexton
6/6/1998 Site Added to Database Site added by staff. Scott Pexton
6/16/1998 Site Ranked Using the AHRM Site ranked by staff. Scott Pexton
7/27/1998 Update or Other Action Received Preliminary Assessment Records Review report prepared by Hart Crowser, Inc. Scott Pexton
8/6/1998 Update or Other Action Received Draft Site Sampling Plan prepared by Hart Crowser, Inc. Scott Pexton
8/18/1998 Site Characterization Workplan Approved Letter sent with approval of Draft Sampling Plan. Scott Pexton
9/14/1998 Update or Other Action Received Final Site Sampling Plan prepared by Hart Crowser, Inc. Scott Pexton
12/28/1998 Update or Other Action Received Draft Remedial Investigation report prepared by Hart Crowser, Inc. Scott Pexton
3/18/1999 Update or Other Action Letter sent with comments on Draft Remedial Investigation report. Scott Pexton
4/30/1999 Update or Other Action Received Final Remedial Investigation report prepared by Hart Crowser, Inc. Scott Pexton
10/21/1999 Site Ranked Using the AHRM Site reranked based on information from April 1999 Remedial Investigation report. Scott Pexton
2/27/2002 Update or Other Action Received "Corrective Action Plan" prepared by Clearwater Environmental, Inc. The plan describes a proposed interim removal action to excavate up to 50 cubic yards of petroleum-contaminated soil to reduce potential exposure to grossly contaminated soil. The plan proposes method one cleanup levels for petroleum hydrocarbons excavated during the interim action, based on Table A1 of 18 AAC 75.341 (Category D cleanup levels proposed are 1,000 mg/kg for GRO, 2,000 mg/kg for DRO, and 2,000 mg/kg for RRO). BTEX concentrations are to be compared to method two, Table B1 Migration to Groundwater cleanup levels. Excavated soil to be transported to a thermal desorption treatment facility located in Lakewood, Washington. Scott Pexton
4/10/2002 Update or Other Action Received "Final Interim Removal Action Plan" prepared by Clearwater Environmental, Inc. Scott Pexton
4/15/2002 Site Characterization Report Approved Sent letter to Norm Straub of the Alaska Army National Guard with approval of the 1999 Final Site Investigation report prepared by ERM West, Inc./Hart Crowser, Inc. with conditions: (1) based on the information provided, ADEC does not approve the proposed alternative cleanup levels of 10,250 mg/kg for DRO, 1,400 mg/kg for gasoline range organics (GRO), 265 mg/kg for benzene, 473 mg/kg for toluene, 778 mg/kg for ethylbenzene, and 770 mg/kg for total xylenes; and, (2) soil cleanup levels provided under method one and method two apply at a contaminated site unless the department approves an alternative cleanup level that the responsible person has proposed under method three or method four (18 AAC 75.340 (d)). Letter also provided specific comments on the interim removal action plan provided by Clearwater Environmental, Inc. Scott Pexton
5/3/2002 Update or Other Action Received Email message from Norm Straub of AKARNG with attached Addendum for Final Interim Removal Action Plan. Scott Pexton
5/16/2002 Interim Removal Action Approved Letter sent to Norm Straub of AKARNG with approval of interim removal action plan (with addendum) prepared by Clearwater The plan describes procedures to conduct an interim removal action in accordance with 18 AAC 75.330. ADEC determined that the proposed interim removal action will reduce human and environmental exposure to hazardous substances at the site and help to prevent the migration of hazardous substances from the site to groundwater and surface water. Up to fifty cubic yards of petroleum-contaminated soil will be excavated and placed in 55-gallon steel drums or 1-cubic yard Supersacks for temporary storage onsite in an area lined with 10-mill polyethylene plastic. The drums or Supersacks will also be covered with a 6-mill polyethylene plastic cover. The contractor intends to transport the contaminated soil via barge to Seattle, Washington and then via highway to a thermal desorption treatment facility located in Lakewood, Washington. Prior to transporting the contaminated soil from the Stebbins Federal Scout Armory site, the Alaska Army National Guard contractor will obtain written ADEC approval to move the soil in accordance with 18 AAC 75.370 (b).fifty Scott Pexton
5/16/2002 Record of Decision Cleanup Levels: Benzene = 0.02 mg/kg, GRO = 100 mg/kg, and DRO = 200 mg/kg using method one, Table A1 and Table B1 at 18 AAC 75.341. Approximately 50 cubic yards of petroleum-contaminated soil will be excavated in accordance with an approved interim removal action plan. Scott Pexton
7/10/2002 Update or Other Action Received faxed documentation from Norm Straub of the Alaska Army National Guard regarding TPS Technologies Inc., a soil treatment facility in the State of Washington, including a cop0y of the operating permit, and a letter indicating acceptance of soils from seven AKARNG facilities. Scott Pexton
4/9/2004 Update or Other Action File number assigned: 650.38.002. Sarah Cunningham
6/2/2004 Update or Other Action ADEC received draft Alternate Cleanup Level Demonstration Project. Beatrice Egbejimba
2/4/2005 Update or Other Action Staff reviewed the Draft Interim Removal Action Report that was recieved April 2003. The report documents the removal of 50 yards of contaminated soil. The excavation did not meet the cleanup goals established in the ROD. Confirmations samples show DRO up to 42,700 mg/kg next to the armory building at 28" bgs. Six other confirmation samples ranged from 575-8,010 mg/kg DRO and GRO up to 459 mg/kg left. Debra Caillouet
2/4/2005 Update or Other Action Staff reviewed the July 2004 final workplan that was recieved Oct 04 for the Alternate Cleanup Level Project. The work plan in general meets requirements. Debra Caillouet
9/1/2005 Interim Removal Action Approved The Interim Removal Action for the Alaska Army National site in Stebbins was approved. It documents that 60 tons of petroleum contaminated soil were removed and treated at TPS Technologies in Washington. Diesel range organics (DRO) were found up to 42,700 mg/kg remaining in the southern sidewall of the excavation near the existing armory building. However, because residual petroleum contamination in soil, for five of six confirmation samples, exceeds 18 AAC 75.341 Table B1 migration to groundwater cleanup levels, additional site characterization and/or cleanup are necessary Debra Caillouet
10/24/2005 Update or Other Action A comment letter on the Alternative Cleanup Level Demonstration Draft Report September 2005 was prepared. Debra Caillouet
6/5/2006 Cleanup Level(s) Approved The cleanup levels proposed are based on a site specific total organic carbon (TOC) content in the soil of 0.2 percent rather than the default 0.1 percent, dry bulk soil density 1.24 g/cm3 (default 1.5 g/cm3 ) and an average moisture content of 14 % (default 10%). The average moisture content was obtained by averaging the results of one sampling event. DEC does not concur with the use of the average moisture value, as it should be obtained over multiple seasons. The dry bulk soil density is calculated from one sample during this event and two from the 1999 Remedial Investigation. The lab report for the 1999 RI shows the two bulk density soil samples to be XXX-S1, which the boring logs indicate were obtained in silts with organics at 0-6 inches below ground surface. The ACL demonstration report indicates the contaminated soil is brown sand. DEC does not concur with the use of the dry bulk soil density value. DEC does approve the use of the TOC value of 0.2 percent. This cleanup level and other petroleum range and constituent cleanup levels, which are based on the migration to groundwater pathway, are shown in the table below. Contaminant of Concern Alternative Soil Cleanup Level Gasoline Range Organics 558 mg/Kg Diesel Range Organics 504 mg/Kg Benzene 0.0225 mg/Kg Toluene 7.82 mg/Kg Ethylbenzene 8.89 mg/Kg Xylenes 126 mg/Kg DEC approves these alternative cleanup levels for the site identified in the Stebbins FSA report referenced above. Please note that the use of these cleanup levels will result in a conditional closure and require establishment of institutional controls to document the location of soil with residual contamination above the method two levels and the provide notice that DEC approval is required prior to transporting such soil off-site. Debra Caillouet
4/2/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Debra Caillouet
2/3/2010 Meeting or Teleconference Held Staff participated in the Installation Action Plan meeting. Debra Caillouet
11/30/2010 Report or Workplan Review - Other Staff reviewed and sent comment to the Alaska Army National Guard on the Draft Work Plan for Site Characterization at 21 Alaska Federal Scout Readiness Centers, November 2010, including the Site Specific Plans for Akiak, St. Mary’s and Tuntutuliak. Debra Caillouet
2/28/2011 Report or Workplan Review - Other Draft Field Sampling Plans for Emmonak, Gambell, Kasigluk, Napaskiak and Stebbins, February 2011 Debra Caillouet
5/23/2011 Site Characterization Workplan Approved Final Work Plan for Site Characterization at 21 Alaska Federal Scout Readiness Centers, April 2011 approved. Debra Caillouet
3/20/2012 Report or Workplan Review - Other Comment sent on the draft data gap investigation report. Debra Caillouet
2/5/2013 Site Characterization Report Approved Stebbins Federal Scout Readiness Center, Data Gap Investigation Report, January 2013 The investigation defined the areas of the site with soil contamination from diesel range organics (DRO) remaining. The hydrocarbon risk calculator was used to calculate a proposed alternative cleanup level of 12,335 mg/kg for DRO. ADEC has no objection to the use of this soil cleanup level. Groundwater has not been identified on-site to 8.5 feet below ground surface (bgs) and well logs in Stebbins indicate an aquitard is present at 16’ bgs with an aquifer at 36’ bgs. ADEC agrees this is an incomplete pathway. Debra Caillouet
6/10/2013 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 74070 Spills/Leaks. Debra Caillouet
9/19/2013 Cleanup Level(s) Approved ROD signed Debra Caillouet
2/24/2015 Report or Workplan Review - Other Draft Stebbins Remedial Action Plan, Federal Scout Readiness Center, February 12, 2015 Debra Caillouet
7/24/2015 Cleanup Plan Approved Final Stebbins Remedial Action Plan, Federal Scout Readiness Center, July 14, 2015 Debra Caillouet
12/17/2015 Update or Other Action Staff changed to Danielle Duncan and hard file transferred to the Juneau office. Kristin Brown
12/23/2015 Update or Other Action Remediation will occur this summer. Work plan has already been approved. There is no groundwater contamination. Danielle Duncan
5/3/2016 Update or Other Action Field work is planned for August. Danielle Duncan
12/5/2017 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 74070 Spills/Leaks. Danielle Duncan
12/12/2017 Report or Workplan Review - Other Reviewed the Final Stebbins Remedial Action Report. Source removal activities centered around 7 historic soil sample locations that exhibited diesel range organics (DRO) at concentrations greater than the site-specific cleanup level. These were located in 2 places: south of the former 3,000-gallon aboveground storage tank (AST) (excavation 1) and east of the former AST (excavation 2). The contaminated soil (approximately 47 tons) was transported to Alaska Soil Recycling for treatment and disposal. Danielle Duncan
12/15/2017 Cleanup Complete Determination Issued Danielle Duncan

Contaminant Information

Name Level Description Media Comments
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Site-specific alternative cleanup level for DRO of 12,335.

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)

Missing Location Data

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