| Action Date |
Action |
Description |
DEC Staff |
| 1/21/1992 |
Site Added to Database |
This site is included in the state EPA Eielson 100.38.011. |
Former Staff |
| 8/3/1992 |
Meeting or Teleconference Held |
Meeting regarding SERs in Seattle. Discussed requirements for NFA. |
Former Staff |
| 9/3/1992 |
Meeting or Teleconference Held |
Meeting EAFB regarding NFA. Discussed site specific data regarding DP28 and reasons for NFA. Documentation placed in file. Formal Documentation to follow. |
Former Staff |
| 9/22/1992 |
Update or Other Action |
(Old R:Base Action Code = NFA - No Further Action Required (CERCLA)). Received letter from EAFB closing site. Site accepted as a NFA. |
Former Staff |
| 12/9/1992 |
Update or Other Action |
(Old R:Base Action Code = CORR - Correspondence (General)). SER source evaluation write up submitted by Air Force., Agenda: OU-6b Interim action and management plan for OU-6 due 1/15/93. |
Rielle Markey |
| 2/23/1993 |
Update or Other Action |
(Old R:Base Action Code = RPL2 - Site Information Request Letter). Sent PRP-CS database Notification Letter to RP requesting update and more environmental information concerning contaminated site. Department of the Air Force responded with update of requested site information on 3-17-93. |
Jeff Peterson |
| 5/6/1993 |
Update or Other Action |
(Old R:Base Action Code = SA1R - Phase I SA Review (CS/LUST)). Reviewed Primary Draft Phase One Source Evaluation Report for SER Sources. |
Rielle Markey |
| 8/12/1993 |
Update or Other Action |
(Old R:Base Action Code = DD - Decision Document (CERCLIS)). NFA accepted - letter and in Seattle meeting with EPA EAFB. |
Rielle Markey |
| 8/23/1993 |
Site Closure Approved |
Site CLOSED per verbal from project manager Markey. |
Rielle Markey |
| 9/24/1996 |
Record of Decision |
Final Site-Wide Record of Decision, September 1, 1996; two documents received. |
Rielle Markey |
| 8/26/2004 |
GIS Position Updated |
Position acquired using "Base MW Map 2004" CAD drawing from EIAFB georeferenced to QuickBird Satellite imagery, NAD27. Also updated Section to 13 from 12. |
Torsten Ernst |
| 7/6/2006 |
Update or Other Action |
ADEC agreed to decrease sampling of the North Boundary Wells from annual sampling to biennial. Upcoming measurements will be summer 2007, 2009, 2011, etc. Concentrations of VOCs, SVOCs, and metals in the sentinel wells have been monitored annually since 1992 and there has been no detection of contamination. |
Emily Youcha |
| 6/25/2012 |
Site Reopened |
Site reopened per Settlement Agreement. |
Bri Clark |
| 12/22/2016 |
Update or Other Action |
DEC approved the Remedial Investigation / Feasibility Study Management Plan for Operable Unit 2 Source Areas, Eielson Air Force Base, Alaska (November, 2016). This applies to 7 source areas inside OU2 and 21 source areas outside of OU2. |
John O'Brien |
| 4/25/2017 |
Update or Other Action |
DEC reviewed and provided comments on the Draft Programmatic Quality Assurance Project Plan, Addendum No. 2, Eielson Air Force Base, Alaska (March, 2017). |
John O'Brien |
| 6/9/2017 |
Update or Other Action |
DEC Approved the 2017 Field Sampling Plan, Eielson Performance-Based Remediation, Eielson Air Force Base, Alaska. |
John O'Brien |
| 11/20/2018 |
Document, Report, or Work plan Review - other |
DEC reviewed and provided comments on the "Draft Remedial Investigation/Risk Assessment Report for OU2 Source Areas, Eielson Performance Based Remediation, Eielson Air Force Base, Alaska," dated September 2018. |
Bri Clark |
| 1/7/2020 |
Meeting or Teleconference Held |
A comment resolution meeting was held to discuss the remaining issues for the OU-2 remedial investigation-risk assessment report. DP028 contaminants and extent of contamination were discussed. The remedial investigation identified metals above project screening levels (PSLs) and background threshold values (BTVs) in fly ash; Volatile Organic Compounds (Chloroform, TCE, PCP,), Semi Volatile Organic Compounds (naphthalene), dioxins ( 2,3,7,8-TCDD), and metals above PSLs in soil; and metals above PSLs and BTVs in groundwater. The metals barium and chromium exceed the PSLs and BTVs in fly ash, surface soil, and subsurface soil and chromium exceeds the PSL in groundwater. Chromium speciation is recommended to determine whether hexavalent chromium is present. |
Dennis Shepard |
| 8/4/2020 |
Document, Report, or Work plan Review - other |
The Alaska Department of Environmental Conservation (DEC) completed a backcheck review of the responses to DEC comments originally provided on November 30, 2018 for the draft version of the Final Supplemental Remedial Investigation/Risk Assessment Report for OU2 Source Areas, Eielson Performance-Based Remediation, Eielson Air Force Base, Alaska, June 2020. This report summarizes the remedial investigation (RI)/risk assessment (RA) activities conducted from 2016 through 2017 at source areas in Eielson Air Force Base Operable Unit 2 (OU2). The backcheck of the responses and redline document found that all responses were acceptable and the document is being finalized for DEC and EPA approval. |
Dennis Shepard |
| 10/23/2020 |
CERCLA RI Report Approved |
The Final Supplemental Remedial Investigation/Risk Assessment Report for OU2 Source Areas, Eielson Air Force Base, September 2020 was approved by EPA and DEC on this date. The report summarizes the remedial
investigation (RI)/risk assessment (RA) activities conducted from 2016 through 2017 at 11 source areas within Eielson Air Force Base Operable Unit 2 (OU2). |
Dennis Shepard |
| 12/28/2021 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 71347 name: Eielson AFB (SER-1) (DP28) Fly Ash |
Axl LeVan |
| 8/29/2022 |
Document, Report, or Work plan Review - other |
DEC provided backcheck review comments for the Final Supplemental Remedial Investigation Work Plan, Eielson Air Force Base, Alaska (August 2022). The Supplemental Remedial Investigation (RI) Work Plan describes the 2022 RI activities to be conducted at Eielson Air Force Base, Alaska. The scope of the Supplemental RI is to address current data gaps at the CERCLA source areas on Eielson AFB for all operating units. |
Dennis Shepard |
| 9/19/2022 |
CERCLA RI Plan Approved |
EPA and DEC provided a joint approval for the Final Supplemental Remedial Investigation Work Plan Eielson Air Force Base, Alaska (September 2022). The scope of this Supplemental RI is to address current data gaps at the CERCLA source areas on Eielson AFB. The data gaps are generally related to the incomplete characterization of site contaminants under the 2015-2021 Performance Based Remediation (PBR) and emerging contaminants identified since the 2015-2021 PBR. |
Axl LeVan |
