| Action Date |
Action |
Description |
DEC Staff |
| 6/12/1992 |
Site Added to Database |
|
Former Staff |
| 6/12/1992 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST Site created in CSP for source area ID 78097 |
Former Staff |
| 10/21/1994 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
entered by JC |
Former Staff |
| 10/21/1994 |
Underground Storage Tank Site Characterization or Assessment |
Tank removal/Preliminary Site Assessment report received. Highest DRO 6.1 although 745 ppm in data but not mentioned in report (presumably from 300 yd stockpile which was subsequently returned to excavation). SA 7/14/94. CN 7/45/94. No Post-C. No FacID. |
Former Staff |
| 8/21/2002 |
Update or Other Action |
RECKEY has automatically been generated. |
Cynthia Pring-Ham |
| 1/28/2004 |
Update or Other Action |
Transferred DEC staff lead from John Carnahan |
Cynthia Pring-Ham |
| 6/26/2008 |
Exposure Tracking Model Ranking |
Intitial Ranking Complete for Source Area: 78097 (Autogenerated Action) |
|
| 10/14/2009 |
Document, Report, or Work plan Review - other |
Provided comments to the USAGAK on the Draft "Abandoned UST Investigation in the Administrative Area" work plan. The work plan details the proposed investigation strategy for characterizing the extent and magnitude of petroleum contamination remaining in the vicinity of the former UST. COmment focused on inconsistencies within the planning documents and appropriate borehole decommissioning and sampling procedures. Work is scheduled to begin upon approval of the project planning documents. |
Guy Warren |
| 10/14/2009 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 78097 name: UST |
Guy Warren |
| 4/12/2010 |
Document, Report, or Work plan Review - other |
Received Draft Investigation Report for Tank #000 and #450 and #451 on 3/30/2010. Provided comments to the Army on this date. ADEC was unable to concur with the conclusions of the report for several reasons primarily that the maximum vertical extent of contamination had not been reached and therefore the sites were not adequately characterized. The Army has agreed to perform additional characterization at these sites during the 2010 Field season. |
Guy Warren |
| 9/16/2010 |
Document, Report, or Work plan Review - other |
Received 2010 Work Plan addendum for additional characterization at the GRTS Administrative area. Work plan addressed agreed to sampling and investigation to complete characterization of this site. In addition a third LUST site #449 was included in the investigation at the request of ADEC. This work should address ADEC site characterization requirements for all three remaining LUST sites at the GREA. Submitted work plan approval letter with minimal comments. |
Guy Warren |
| 7/21/2011 |
Document, Report, or Work plan Review - other |
Received final assessment report “Investigation of Abandoned Underground Storage Tank Sites in the Administrative Area” for the Gerstle River Test Site, AK. The report identifies the extent of petroleum contamination at three UST sites (#000, #450/451, and #499). At former UST #450/451 DRO, GRO and VOC soil contamination, above migration to groundwater cleanup levels, extend from 10 to approximately 20 ft below ground surface. Groundwater at this site is over 400 ft BGS and exposure to contamination is likely only during excavation activities that extend beneath 10 ft. The report recommends site closure with institutional controls to prevent unintended excavation of contaminated media. A decision document will be prepared to document the decision and identify appropriate IC’s for implementation. |
Guy Warren |
| 5/15/2014 |
Update or Other Action |
Submit Closure Determination to US Army for GRTS Administrative Areas UST site #450/451. The UST was removed from the site in the mid 1990’s. Site assessment work during the tank removals and subsequent release investigation work have documented some residual petroleum in soil at this site. Because groundwater is located over 400 feet below the ground surface, migration of contaminants from soil to the groundwater is not a pathway of concern. Therefore, the approved cleanup levels for GRTS UST sites are the most stringent of the soil direct contact, ingestion or inhalation cleanup levels established in 18 AAC 75.341 (d), Table B1 and B2. Surface soil at the site meets the approved cleanup levels, however, contaminated soil remains between depths of 11 and 15 feet below ground surface. ADEC has determined the residual contamination does not pose an unacceptable risk as long as it remains in place and is not relocated to an area where exposure could occur. Therefore, ADEC is requesting the Army establish ICs restricting future excavation at the site to ensure contaminated soil is not exposed or moved to a location where it could pose potential risk. Once the IC’s have been established we will update site status on the database. |
Guy Warren |
| 9/4/2014 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 78097 UST. |
Guy Warren |
| 5/22/2015 |
Document, Report, or Work plan Review - other |
Submit comments to US Army on the Draft LTM plan for the GRTS. The plan identified LUC's required for UST #450 and Best Management Practices for the remainder of the property. |
Guy Warren |
| 7/23/2015 |
Document, Report, or Work plan Review - other |
Submit approval letter for Final Long Term Management Plan for the Gerstle River Test Site. The document outlines the required institutional controls for interim management of the lingering CWM issues as well as to address petroleum contamination remaining at the former USTs. |
Guy Warren |
| 4/29/2016 |
Cleanup Complete Determination Issued |
Submit letter to US Army notifying them of the site status change for UST #450 and #451. ADEC received the Final “Long-Term Management Plan, Gerstle River Test Site (GRTS), AK” on July 20, 2015. This plan establishes Land Use Controls (LUC’s) for the GRTS and UST #450 and #451. In accordance with ADEC’s May 14, 2014 closure determination, the establishment of LUCs for UST #450 and #451 was required prior to changing the site status in ADEC’s Contaminated Sites (CS) Database. |
Guy Warren |
| 4/29/2016 |
Institutional Control Record Established |
Institutional Controls established and entered into the database. |
Guy Warren |
| 10/4/2023 |
Institutional Control Compliance Review |
DEC provided review comments for the "Draft 2022 Land Use Controls Inspection Report, Gerstle River Test Site, U.S. Army Garrison Alaska, dated August 2023" to the U.S. Army. The document describes an assessment of the institutional controls and discusses the results of a site inspection completed in 2022. |
Erica Blake |
| 1/2/2024 |
Document, Report, or Work plan Review - other |
DEC provided responses to comments for the "Draft 2022 Land Use Controls Inspection Report, Gerstle River Test Site, U.S. Army Garrison Alaska" (dated August 2023) to the U.S. Army. The document describes land use control and institutional control inspections conducted in 2022. All responses to comments have been accepted pending a comment backcheck of the final document. |
Erica Blake |
| 9/19/2024 |
Long Term Monitoring Workplan or Report Review |
DEC provided approval for the "Final 2022 Land Use Controls Inspection Report, Gerstle River Test Site, U.S. Army Garrison Alaska" (dated September 2024). The report describes observations from a 2022 land use control inspection. Recommendations in the report included making the signs at the site more robust with up to date information regarding the areas of concern (AOC). |
Erica Blake |
| 10/8/2024 |
Document, Report, or Work plan Review - other |
DEC provided comments for the "Draft 2023 Land Use Controls Inspection Report, Gerstle River Test Site, U.S. Army Garrison Alaska (dated September 2024) to the U.S. Army. The purpose of the land use control inspection was to evaluate the effectiveness of the land use controls in place. In 2023 there were no corrective actions needed, no Excavation Clearance Requests (ECRs) were issued. Report recommendations were for placing more robust, and informative signs about the potential contamination that could be present in the area. |
Erica Blake |
