Action Date |
Action |
Description |
DEC Staff |
9/24/1997 |
Site Added to Database |
Petroleum contamination. |
Scott Pexton |
9/24/1997 |
Site Ranked Using the AHRM |
Site ranked by staff. |
Scott Pexton |
7/21/1998 |
Site Characterization Workplan Approved |
Letter sent with approval of Site Sampling Plan prepared by CH2MHILL. |
Scott Pexton |
2/8/1999 |
Update or Other Action |
Received Draft Remedial Investigation Report prepared by CH2MHILL. |
Scott Pexton |
5/3/1999 |
Update or Other Action |
Letter sent with comments on draft report. |
Scott Pexton |
6/23/1999 |
Update or Other Action |
Received final Remedial Investigation Report prepared by CH2MHILL. |
Scott Pexton |
10/20/1999 |
Site Ranked Using the AHRM |
Site reranked based on 9/9/1998 letter from William Vagt and information in 1999 Remedial Investigation Report. |
Scott Pexton |
5/17/2000 |
Interim Removal Action Approved |
Letter sent to Norman Straub with approval to excavate up to 50 cubic yards of petroleum-contaminated soil to be temporarily stored in 55 gallon drums. |
Scott Pexton |
11/27/2000 |
Update or Other Action |
ADEC received Post Treatment Report for Napaskiak, prepared by BNC International, Inc. |
Scott Pexton |
12/6/2000 |
Update or Other Action |
ADEC received Draft Interim Removal Action report, prepared by Clearwater Environmental, Inc. |
Scott Pexton |
12/18/2001 |
Update or Other Action |
Received Final Interim Removal Action Report prepared by Clearwater Environmental, Inc. A total of thirty-seven cubic yards of DRO contaminated soil was removed from the site and placed in one hundred forty-one 55-0gallon drums for transport to the BNCI thermal treatment facility in Bethel. Confirmation soil samples collected from the excavated areas had one DRO sample reported at 18, 200 mg/kg. Seven other confirmation soil samples were reported with DRO ranging from 9.75 to 582 mg/kg. |
Scott Pexton |
8/6/2003 |
Update or Other Action |
ADEC sent letter to Norman Straub of Anchorage Army National Guard (AKARNG) with comments regarding Draft Alternative Cleanup Level Demonstration Project dated December, 2002. |
Beatrice Egbejimba |
9/18/2003 |
Update or Other Action |
ADEC approval letter sent to Norm Straub (AKARNG). The final workplan for ACL demo project was received 9/3/03. |
Beatrice Egbejimba |
3/22/2004 |
Update or Other Action |
File number assigned: 2433.38.001. |
Sarah Cunningham |
5/24/2005 |
Update or Other Action |
Staff reviewed the Installation Action Plan and sent the following comment.
The IAP summarizes the results of the Site Investigation (SI) that evaluated five areas of concern (AOC) in 1995. Of these five, one area, AOC 5, the old Above Ground Storage Tank (AST) stand on the east side of the building had up to 22,000 mg/kg diesel range organics (DRO) in soil.
A Remedial Investigation (RI) in 1998 confirmed the presence of DRO up to 39,000 mg/kg at AOC 5 and also found DRO up to 5,900 mg/kg at AOC 1, the old AST stand on the west side of the building.
An Interim Removal Action (IRA) in 2000 removed approximately 37 cubic yards of DRO impacted soil. At AOC 1, confirmation sampling at the bottom of the excavation showed DRO contamination remaining up to 582 mg/kg. Confirmation sampling at AOC 5 showed low levels of DRO remaining (maximum 385 mg/kg) except near the armory where excavation was stopped to protect the structure. DRO remained next to the armory at 18,200 mg/kg.
An unused pipeline is described in the SI and the RI. Photographs in the IRA report show the excavation went up to the location of the pipeline. The Alaska Department of Environmental Conservation (DEC) requests this unused pipeline be cleaned and removed to ensure it is not a source for continued petroleum releases.
Currently an Alternative Cleanup Level report is pending for the Napaskiak Federal Scout Armory. The results of this will be used to determine the future actions at the site that may include another removal action once the building is removed, no further action, or long-term monitoring until the building is removed.
DEC would like additional information on the schedule for building removal. A new armory building is shown in the ACL work plan that was not present at any of the earlier actions. Please provide information on the installation and use of this new building.
When the results of the ACL demonstration project are available, DEC would like to work with the Alaska Army National Guard to determine the most appropriate actions for the site. |
Debra Caillouet |
5/19/2006 |
Cleanup Level(s) Approved |
The cleanup levels proposed are based on a site specific total organic carbon (TOC) content in the soil of 2.4 percent rather than the default 0.1 percent, dry bulk soil density 0.96 g/cm3 (default 1.5 g/cm3 ) and an average moisture content of 32 % (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. DEC does concur with the use of the TOC value and the bulk soil density. This results in the gasoline range organics (GRO) soil cleanup level being capped at the maximum allowable level of 1400 mg/kg. 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 1400 mg/Kg
Diesel Range Organics 6000 mg/Kg
Benzene 0.115 mg/Kg
Toluene 62.6 mg/Kg
Ethylbenzene 84.6 mg/Kg
Xylenes 1200 mg/Kg
DEC approves these alternative cleanup levels for the site identified in the Napaskiak FSA report reference 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 |
4/1/2008 |
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 |
Document, Report, or Work plan 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 |
11/30/2010 |
Document, Report, or Work plan 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 |
Document, Report, or Work plan 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 |
4/5/2013 |
Document, Report, or Work plan Review - other |
Draft Napaskiak Federal Scout Readiness Center, Data Gap Investigation Report, January 2013 |
Debra Caillouet |
5/3/2013 |
Site Characterization Report Approved |
Final Napaskiak Federal Scout Readiness Center, Data Gap Investigation Report, April 2013
The report recommends alternative soil cleanup levels based on the aliphatic/aromatic split determined by the Washington EPH/VPH methods. The total DRO based on this is 11,793 mg/kg. This value is calculated from the ingestion cleanup levels of 4100 mg/kg DRO aromatic and 10,000 mg/kg DRO aliphatic. ADEC has no objection to the use of these cleanup levels. Confirmation sampling will be necessary to show all three levels,(total DRO by AK102, DRO Aromatic and DRO Aliphatic) are met for each site.
|
Debra Caillouet |
6/3/2013 |
Cleanup Level(s) Approved |
DRO Aliphatic 10,000 mg/kgm DRO Aromatic 4100 mg/kg, DRO AK102 11,793 mg/kg |
Debra Caillouet |
6/10/2013 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 73789 Spills/Leaks. |
Debra Caillouet |
3/5/2014 |
Document, Report, or Work plan Review - other |
The draft Remedial Action work plan was reviewed. |
Debra Caillouet |
5/1/2014 |
Cleanup Plan Approved |
Petroleum contaminated soil will be excavated this summer. |
Debra Caillouet |
12/16/2014 |
Document, Report, or Work plan Review - other |
Draft Remedial Action Report, Federal Scout Readiness Center, Napaskiak Alaska, November 19, 2014 |
Debra Caillouet |
1/9/2015 |
Cleanup Complete Determination Issued |
Remedial Action Report, Federal Scout Readiness Center, Napaskiak Alaska, January 5, 2015 |
Debra Caillouet |