| Action Date |
Action |
Description |
DEC Staff |
| 1/16/1992 |
Site Added to Database |
This site is included in the state EPA Eielson FFA 100.38.011. |
Former Staff |
| 12/3/1992 |
Update or Other Action |
Received documents from EAFB on OU 3, 4 and 5. These documents are the quality-assured field sampling data. Markey is now reviewing them. Items # 35 and 36, from the CS/DOD bookcase. |
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 |
| 3/23/1993 |
Site Characterization Workplan Approved |
(Old R:Base Action Code = MP - Management Plan (CERCLIS)). Received workplan for natural attenuation of organic contaminants, Sources 45 and 57. |
Rielle Markey |
| 4/21/1993 |
Update or Other Action |
(Old R:Base Action Code = CORR - Correspondence (General)). Sent correspondence concerning review of workplan for natural attenuation study for site. |
Rielle Markey |
| 10/18/1993 |
Site Ranked Using the AHRM |
Initial ranking. |
Former Staff |
| 9/30/1995 |
Update or Other Action |
Eielson AFB Operable Units 3, 4 and 5 ROD includes 20 source areas that have been combined because of commonalities in contamination. These source areas are DP44, WP45, SS57, SS56, SS61, DP25, ST27, WP33, SS35, SS36, SS37, SS39, SS63, ST58, SS64, LF02, LF03, FT09, LF04 and LF06. |
Clint Adler |
| 2/16/1996 |
Update or Other Action |
(Old R:Base Action Code = RA - Remedial Action). Received Remedial Action Workplan. |
Clint Adler |
| 4/15/1996 |
Update or Other Action |
(Old R:Base Action Code = RD - Remedial Design). Air Force Comments on Draft Remedial Design for OU-3, 4 and 5. |
Clint Adler |
| 5/10/1996 |
Update or Other Action |
Intrinsic REE/CA for site 45/57 (Septemeber 1995), EAFB. |
Clint Adler |
| 5/10/1996 |
Update or Other Action |
(Old R:Base Action Code = RD - Remedial Design). OU-3, 4, and 5, RDRA Workplan, EAFB. |
Clint Adler |
| 9/24/1996 |
Record of Decision |
Final Site-Wide Record of Decision, September 1, 1996; two documents received. |
Rielle Markey |
| 3/24/1997 |
Update or Other Action |
Site updated by Shannon and Wilson, based on the Air Force Relative Risk Evaluation Worksheet dated 10/23/95. |
S&W |
| 12/26/2001 |
GIS Position Updated |
Worked with Heather Goldman obtaining GIS latitude and longitude from 1:63,300 topographic map. |
Heather Goldman |
| 1/3/2002 |
Site Ranked Using the AHRM |
Changed Toxicity Value to 4 from 3 due to presence of hazardous substances. |
Former Staff |
| 1/14/2002 |
Site Number Identifier Changed |
Changed Workplan from X1 to X9 to reflect presence of a hazardous substance. |
Ann Farris |
| 9/2/2002 |
Institutional Control Record Established |
When the OU-3,4,5 ROD was signed in 1995, it established institutional controls for this site. These ICs include: a prohibition on the installation or use of drinking water wells, a requirement that all monitoring wells are secured with locks, any activity that may result in exposure to contam. g.w. or moving contam. g.w. requires approval of CES/CEV, any activity disturbing a remedial action requires approval of CES/CEV, any activity that may result in exposure to or removal of contam. soil requires approval of CES/CEV, if contam soil or g.w.. are removed from the source, they must be disposed of or treated in accordance with regulation, and a requirement to notify ADEC and EPA of any proposal to change the existing land use or land use controls at the site. |
Ann Farris |
| 10/6/2002 |
Update or Other Action |
ADEC was notified that the Air Force had been using Well C, which is located within the TCE plume associated with WP45/SS57. A meeting between the Air Force and ADEC on 10/5/02 resulted in an agreement to decommission Well C (as was supposed to be done previously). The Air Force is going to look into using another backup well at Building 1301. The Air Force indicated Well C would be taken offline immediately and money would be programmed to properly decommission. |
Ann Farris |
| 1/21/2003 |
Long Term Monitoring Established |
This site is included in the Sitewide Monitoring Program and is monitored in conjunction with site SS57. This site will be monitored in 2004 and then re-evaluated in 2008 during the ROD Review. |
Emily Youcha |
| 1/21/2003 |
Update or Other Action |
The 5-year review is scheduled in 2003 to evaluate the long-term monitoring trends. The Air Force's Remedial Process Optimization Team is planning to further delineate the TCE groundwater plume in 2003. |
Ann Farris |
| 9/19/2003 |
Meeting or Teleconference Held |
Staff attended a meeting with Air Force and EPA personnel to resolve comments on the draft Eielson Five-Year Review. Issues with the document included event-driven groundwater sampling at several contaminated sites, which we denied pending further clarification of the process, and closing numerous sites under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), but keeping them open under the State until 18 AAC 75 diesel range organic cleanup levels are met. |
Ann Farris |
| 8/9/2005 |
Update or Other Action |
Staff requested Eielson sample the nearby building for vapour intrusion. Staff received results from Bioenvironmental group. They used a PID to detect VOCs within the building and none were detected. Staff concurred with the results and method because they would use industrial air quality standards (OSHA) which are in the ppm range. Staff recommended for future sampling, charcoal tubes or passive diffuser sampling techniques should be used. |
Emily Youcha |
| 8/9/2005 |
Meeting or Teleconference Held |
Staff requested Eielson evaluate the feasiblity of enhanced biodegredation at this site. TCE exists in the ground water up to 61 mg/L. Staff would like to see the ground remediated and does not concur with Eielson that reductive dechlorination is occuring at the site because biodegradation products are not found and geochemistry is no longer conducive to anaerobic degredation. Staff participated in a meeting with Eielson, and they stated they would start a programming document for enhancing bioremediation at the site, even though funds would probably not be available to conduct the project for several years. |
Emily Youcha |
| 8/9/2005 |
Update or Other Action |
Staff received the results from the 2004 Sitewide Monitoring Report. TCE concentrations in well 45MW08 continue to remain elevated and variable. Recent measurment was 4.1 mg/L TCE. In 2001, TCE was found up to 61 mg/L nearby well 45MW08. The dissolved phase TCE plume for WP45/SS57 is probably about 5 acres. |
Emily Youcha |
| 3/1/2006 |
Update or Other Action |
Staff had a telephone call with Eielson AFB to discuss their long-term monitoring program optimization. Eielson would like to apply "event-driven monitoring" to many benzene-contaminated sites, where monitoring would occur when the concentration reached the MCL at a predicted time. They are using MAKSENS to do the statistical regressions and come up with a slope indicating benzene degradation rates. This slope would predict when the concentrations would reach the MCL and monitoring would occur at that time only. They would like to apply this slope to other "similar sites" to predict when the concentrations would reach the MCL. Eielson submitted the concept to AFCEE for review, but apparently AFCEE requested more data, which Eielson did not have. At this point, DEC has not reviewed any data on this concept and requested Eielson submit a report showing the data and justification of their assumptions. |
Emily Youcha |
| 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 |
| 9/11/2006 |
Update or Other Action |
Staff approved the Aug 2006 remedial action objectives workplan for site characterization of the TCE contaminated soil and ground water at SS57 site. Approximately 20 or more wells will be installed and soil samples will be collected. Wells will be surveyed to deterimine the ground-water flow direction. This characterization is to plan for the remedial design of enhanced bioremediation project. |
Emily Youcha |
| 2/1/2007 |
Update or Other Action |
The Draft Remedial Action Operation Report for Operable Unit 3 was received. Four monitoring wells were installed, and 23 soil boring/groundwater sampling points were advanced in an area that overlaps portions of the WP45 and SS57 source areas. Soil samples were collected at 3 and 8 feet below ground surface. Nearly all of the samples detected TCE above the soil cleanup level of 20 ug/kg with concentrations up to 110,000 ug/kg. Groundwater samples were collected at 12 feet below ground surface. Most of the sample results exceeded the groundwater cleanup level of 5 ug/L with concentrations up to 89,000 ug/L. The extent of the plume was not delineated vertically or laterally. |
Kim DeRuyter |
| 1/30/2008 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed. |
Janice Wiegers |
| 11/24/2008 |
CERCLA ROD Periodic Review |
ADEC issued a letter of concurrence on the 2008 Five-Year ROD review for Eielson AFB. In the letter ADEC concurred with the current remedies but recommends further work on the following: the vapor intrusion pathway needs to be evaluated for all potential receptors at WP45/SS57 site along with further evaluation of the selected remedy to ensure the Remedial Action Objectives are going to be met. The buried drums remaining at SS35 may still contain product that may pose a potential risk to ecological and human health risk in the future. The area of buried drums identified outside of SS37 may pose a threat of an imminent release of hazardous substances and warrants further investigation or response action. As stated in the 2008 Five-Year ROD Review, the overall long-term protectiveness determination for the Sitewide OU/Garrison Slough remedy will be further investigated. A Land Use Control Management Plan should be developed and implemented. |
Deborah Williams |
| 7/20/2010 |
Site Visit |
A meeting and site visit were planned at Eielson, but the meeting was moved to the DEC office when Eielson staff refused to allow EPA and DEC attorneys access to the Air Force Base. Topics discussed during the meeting were: spill reporting, Event or DQO Driven Monitoring, documentation of groundwater sampling and analysis plans, and PCBs in Garrison Slough. It was determined that the spill reporting issuses would be addressed through the Statement of Cooperation Working Group as it was a larger issue than just Eielson. The Event or DQO Driven Monitoring topic created a lot of discussion, EPA and DEC did not believe the decision to go to this type of site wide monitoring was documented in the ROD, ROD Review, or met the requirements in the FFA. The Air Force stated that the topic had been discussed in meetings and briefings, DEC countered that discussions and briefings needed to culminate in Decision Documents. EPA requested that the SAP be updated as a follow on task to the meeting. On the topic of Garrison Slough the Air Force stated that due to decreased flow and discharge of diatomaceous earth from the Water Treatment Plant that removal of sediment was no longer practical, and suggested that since the approvede cleanup level had been met in most of the slough, that further removal was not necessary. DEC suggested that the site be re-evaluated due to changing site conditions. After the meeting a site visit was conducted. The DEC attorney was not allowed on base, but the EPA attorney was allowed access after she provided her enforcement credentials. During the site visit, Eielson staff discussed their plans to conduct additional ZVI injections at the WP45/SS57 site. Neither DEC or EPA had received a workplan for this action. |
Kim DeRuyter |
| 8/3/2010 |
Update or Other Action |
EPA issued a letter requesting a "stay" of the TCE groundwater pilot study groundwater injections to allow time for document review. |
Kim DeRuyter |
| 8/11/2010 |
Update or Other Action |
Received Annual Report for Operatble Unit 3, dated June 2010. |
Kim DeRuyter |
| 8/11/2010 |
Update or Other Action |
Received Draft Environmental Restoration Support Services Work Plan for Operable Unit 3 (April 2010-September 2011), dated July 2010. |
Kim DeRuyter |
| 1/14/2011 |
Meeting or Teleconference Held |
EPA, DEC, the Air Force and their contractor (EA) met to discuss a path forward for the TCE plume. EA presented site maps with historic information, and a site map with proposed locations for downgradient nested wells. The proposed locations were just presented as talking points with the expectation that the group would decide how to best place downgradient wells. The group decided that it was premature to plan placement of nested wells. In stead EPA and DEC requested a hydrological study of the site to include gradient, conductivity, porosity along with stratigraphy and lithology of the formation. The hydrological study should be conducted in concurrance with more complete soil and groundwater characterization. The Air Force will try to have a scope of work written, so that the group could provide input during the next RPM meeting scheduled for January 19th. |
Kim DeRuyter |
| 4/1/2011 |
Update or Other Action |
Staff approved a small work plan for continuous water level monitoring at source areas WP45/SS57. The objectives of the work plan are to record water level fluctuations, prepare hydrographs through ice-out and runoff, and establish horizontal and vertical hydraulic gradientients. The workplan was submitted on March 30, 2011, and is expected to be followed up with more hydrgeologic evaluation of the site this summer. |
Kim DeRuyter |
| 4/1/2011 |
Update or Other Action |
Staff approved a small work plan for continuous water level monitoring at source areas WP45/SS57. The objectives of the work plan are to record water level fluctuations, prepare hydrographs through ice-out and runoff, and establish horizontal and vertical hydraulic gradientients. The workplan was submitted on March 30, 2011, and is expected to be followed up with more hydrgeologic evaluation of the site this summer. |
Kim DeRuyter |
| 6/14/2011 |
Site Visit |
Contaminated Sites staff participated in an all-day site visit that included WP45/SS57, SS67, LF03/FT09, ST10/SS14, DP25, ST27, SS35, SS37 and the stockpile containment area. Drums were seen in and adjacent to the pond at SS35 and both petroleum and biogenic sheens were observed on the surface of the pond. All stockpiles in the containment area were covered but two stockpiles were not labeled and from unknown locations. |
Kathleen Beutel |
| 6/14/2011 |
Site Visit |
Contaminated Sites staff participated in an all-day site visit that included WP45/SS57, SS67, LF03/FT09, ST10/SS14, DP25, ST27, SS35, SS37 and the stockpile containment area. Drums were seen in and adjacent to the pond at SS35 and both petroleum and biogenic sheens were observed on the surface of the pond. All stockpiles in the containment area were covered but two stockpiles were not labeled and from unknown locations. |
Kim DeRuyter |
| 6/23/2011 |
Site Characterization Workplan Approved |
Contaminated Sites staff and the Environmental Protection Agency provided comment on a brief letter workplan submitted by EA Engineering on behalf Eielson Air Force Base. EA plans to survey monitoring wells and conduct a soil gas survey at WP45/SS57 to further delineate trichloroethylene and other volatile organic compounds in soil and groundwater. Groundwater monitoring at WP45/SS57 will be described in the Quality Assurance Project Plan which is due this week. |
Kim DeRuyter |
| 7/12/2011 |
Document, Report, or Work plan Review - other |
Contaminated Sites and EPA staff provided joint comments on the draft Quality Assurance Program Plan, received on June 24, for a supplemental remedial investigation (SRI) at WP45/SS57. The objectives of the SRI are to delineate the soil and dissolved-phase contamination, evaluate the risk of vapor intrusion and obtain basic hydrogeologic information. Comments noted that the vapor intrusion investigation should follow a phased approach, requested specific information about how the Triad process will be implemented and asked for inclusion of all source areas (two dry wells, one maintenance shed, one fire training area) on figures. |
Kathleen Beutel |
| 7/12/2011 |
Document, Report, or Work plan Review - other |
Contaminated Sites and EPA staff provided joint comments on the draft Quality Assurance Program Plan, received on June 24, for a supplemental remedial investigation (SRI) at WP45/SS57. The objectives of the SRI are to delineate the soil and dissolved-phase contamination, evaluate the risk of vapor intrusion and obtain basic hydrogeologic information. Comments noted that the vapor intrusion investigation should follow a phased approach, requested specific information about how the Triad process will be implemented and asked for inclusion of all source areas (two dry wells, one maintenance shed, one fire training area) on figures. |
Kim DeRuyter |
| 8/12/2011 |
Meeting or Teleconference Held |
CS staff met with personnel from Eielson AFB and EPA to discuss several topics including WP45/SS57. Field work at WP45/SS57 is scheduled to begin August 22 with arrival of the field lab on September 12. The goal for this year is to delineate the plume horizontally from 0-80 ft bgs. Field work will be guided by the passive soil gas data. Vertical plume delineation is expected to occur in 2012. |
Kathleen Beutel |
| 8/12/2011 |
Meeting or Teleconference Held |
CS staff met with personnel from Eielson AFB and EPA to discuss several topics including WP45/SS57. Field work at WP45/SS57 is scheduled to begin August 22 with arrival of the field lab on September 12. The goal for this year is to delineate the plume horizontally from 0-80 ft bgs. Field work will be guided by the passive soil gas data. Vertical plume delineation is expected to occur in 2012. |
Kim DeRuyter |
| 8/29/2011 |
Site Visit |
CS staff participated in an all-day site visit with EPA and USAF personnel. Sites visited include ST56, LF05, WP45/SS57 and an anti-aircraft artillery (AAA) site south of the flightline that was previously unknown to DEC/EPA and has not been evaluated for contamination. Field work had just begun at WP45/SS57 and there were two drill rigs on site. Soil and groundwater samples were being collected from the parking lot near Building 1183. |
Kathleen Beutel |
| 8/29/2011 |
Site Visit |
CS staff participated in an all-day site visit with EPA and USAF personnel. Sites visited include ST56, LF05, WP45/SS57 and an anti-aircraft artillery (AAA) site south of the flightline that was previously unknown to DEC/EPA and has not been evaluated for contamination. Field work had just begun at WP45/SS57 and there were two drill rigs on site. Soil and groundwater samples were being collected from the parking lot near Building 1183. |
Kim DeRuyter |
| 8/30/2011 |
Meeting or Teleconference Held |
In a technical meeting with DEC, EPA and USAF, the Air Force said that they are having difficulty gaining access to the parking lot and areas around the National Guard building that is just downgradient of the WP45/SS57 source areas. They are working to resolve the issue and in the meantime will samples points further downgradient and cross-gradient.
|
Kathleen Beutel |
| 8/30/2011 |
Meeting or Teleconference Held |
In a technical meeting with DEC, EPA and USAF, the Air Force said that they are having difficulty gaining access to the parking lot and areas around the National Guard building that is just downgradient of the WP45/SS57 source areas. They are working to resolve the issue and in the meantime will samples points further downgradient and cross-gradient.
|
Kim DeRuyter |
| 9/15/2011 |
Meeting or Teleconference Held |
A weekly triad meeting was held with USAF, EPA and DEC. (1) Instead of a mobile field lab, samples are being sent to Test America-Anchorage with expedited turn-around time. A field change form will be completed to document this change. (2) Several samples have been collected but the upgradient edge of the plume has not been delineated and the drillers will focus on those areas next. (3) Several boring locations have been moved to stay off the National Guard parking lot. (4) From now on, USAF will send complete data tables as well as maps with data. (5) 1 gallon of hydraulic fluid was spilled from the drill rig on Aug 25. A 5-gallon pail of contaminated soil was collected. The location of the pail is unknown but USAF will track it down. |
Kathleen Beutel |
| 9/22/2011 |
Meeting or Teleconference Held |
Contaminated Sites staff participated in a weekly Triad meeting to discuss the ongoing investigation at the Eielson Air Force Base WP45/SS57 site. Trichloroethylene has been detected to 51 feet below ground surface (bgs). The Air Force hopes to have complete delineation of the horizontal extent of the plume by early to mid October. Verification of previously detected contamination at depths greater than 80 feet bgs has been postponed until next spring. USAF will submit three field change forms to deal with 1) storage of IDW over the winter, 2) the change from an on-site field lab to sending screening samples to Anchorage, 3) the need for a back-up analytical lab due to over-capacity at the original analytical lab. |
Kathleen Beutel |
| 9/22/2011 |
Meeting or Teleconference Held |
Contaminated Sites staff participated in a weekly Triad meeting to discuss the ongoing investigation at the Eielson Air Force Base WP45/SS57 site. Trichloroethylene has been detected to 51 feet below ground surface (bgs). The Air Force hopes to have complete delineation of the horizontal extent of the plume by early to mid October. Verification of previously detected contamination at depths greater than 80 feet bgs has been postponed until next spring. USAF will submit three field change forms to deal with 1) storage of IDW over the winter, 2) the change from an on-site field lab to sending screening samples to Anchorage, 3) the need for a back-up analytical lab due to over-capacity at the original analytical lab. |
Kim DeRuyter |
| 12/7/2011 |
Meeting or Teleconference Held |
Contaminated Sites staff participated in the final weekly triad meeting for the Eielson Air Force Base WP45/SS57 site. Eielson has completed horizontal delineation of the comingled TCE and benzene plumes that originate from a former fuel hydrant line, fire training pits and two dry wells. A treatability study conducted from 2008 – 2010 appears to have degraded TCE to DCE and vinyl chloride in the heart of one of the TCE source areas, but large portions of the TCE source areas were not treated because the extent of the source areas was previously unknown. A tech memo summarizing 2011 field work will be submitted this winter. Field work next summer will include vertical plume delineation and placement of permanent monitoring wells. |
Kathleen Beutel |
| 12/7/2011 |
Meeting or Teleconference Held |
Contaminated Sites staff participated in the final weekly triad meeting for the Eielson Air Force Base WP45/SS57 site. Eielson has completed horizontal delineation of the comingled TCE and benzene plumes that originate from a former fuel hydrant line, fire training pits and two dry wells. A treatability study conducted from 2008 – 2010 appears to have degraded TCE to DCE and vinyl chloride in the heart of one of the TCE source areas, but large portions of the TCE source areas were not treated because the extent of the source areas was previously unknown. A tech memo summarizing 2011 field work will be submitted this winter. Field work next summer will include vertical plume delineation and placement of permanent monitoring wells. |
Kim DeRuyter |
| 1/27/2012 |
Document, Report, or Work plan Review - other |
Letter addressed to Eielson from ADEC and EPA. Letter describes revisions needed to the Final Version 2 QAPP for WP45/SS57. Letter outlines numerous comments that went unaddressed in previous revisions of the document. Letter requests Eielson CS staff to address these issues before ADEC and EPA may approval QAPP. |
Hannah Harrison |
| 1/27/2012 |
Document, Report, or Work plan Review - other |
Letter addressed to Eielson from ADEC and EPA. Letter introduces attached documentation as comments previously unaddressed in earlier versions of the Draft Final Version 2 Generic QAPP for sites WP45/SS57. Letter suggests meeting to discuss comments. Attached documentation provides original version of comments and additional review comments as to how to address them. |
Hannah Harrison |
| 4/30/2012 |
Document, Report, or Work plan Review - other |
Letter addressed to Eielson from ADEC and EPA. Letter introduces attached documentation as comments previously unaddressed in earlier versions of the draft Supplemental Remedial Investigation/Feasibility Study Managment Plan, source areas WP45/SS57. Letter suggests meeting to discuss comments. Attached documentation provides original version of comments and additional review comments as to how to address them. |
Hannah Harrison |
| 4/30/2012 |
Document, Report, or Work plan Review - other |
Letter from ADEC and EPA to Eielson. Letter notifies appropriate Eielson personel of revisions required to previously submitted Supplemental Remedial Investigation/Feasibility Study Management Plan for source areas WP45/SS57. Letter states that six of eight pre=draft comments were not adequately addressed in report; in additon, submitted document does not comply wtih requirements of the FFA. Letter requests a careful revision and resubmission of document. |
Hannah Harrison |
| 6/29/2012 |
Site Characterization Report Approved |
Letter from DEC and EPA to Eielson notifying approval of the QAPP submitted 6/14/2011. |
Hannah Harrison |
| 10/30/2012 |
Update or Other Action |
Letter addressed to Eielson CS staff from ADEC CS Staff granting approval of directed changes for the Final Supplemental Remedial Investigation/Feasibility Study Management Plan for source areas WP45/SS57 on Eielson Air Force Base. The letter also comments on difficulties between ADEC and USEPA and the USAF due to poor document quality and failure to follow the schedule prescribed by the Eielson Federal Facility Agreement pertaining to the submission of documents by the USAF. The letter also documents a lack of dioxin and perfluorinated compound sampling, a data gap, that will need to be addressed in future sampling efforts. |
Hannah Harrison |
| 12/5/2012 |
Update or Other Action |
Letter addressed to Eielson CS staff from ADEC and USEPA CS staff concerning the "Supplement to the Quality Assurance Project Plan for Supplemental Remedial Investigation Source Area WP45/SS57." Letter approved work contingent upon EAFB addressing comments included with letter in regard to work plan. |
Hannah Harrison |
| 12/7/2012 |
Update or Other Action |
Correspondence from DEC and EPA to Eielson AFB granting approval of the Supplement to the Quality Assurance Project Plan for the Supplemental Remedial Investigation Source Area WP45/SS57 on Eielson Air Force Base, Alaska. The letter notes that the supplement describe's the Air Force's intent to place "permanent monitoring wells and collect soil, groundwater, soil gas, and indoor and outdoor air samples, to complete delineation of the groundwater plume and soil source areas, and begin evaluating the potential for volatile contaminates to impact indoor air via the vapor intrusion pathway." |
Hannah Harrison |
| 3/17/2014 |
Document, Report, or Work plan Review - other |
The AF submitted Draft QAPP Addendum No.2 for Vapor Intrusion Study WP45/SS57. Received 2/24/14. This VI study will help to delineate the horizontal and vertical extent of the groundwater plume as well as the plume stability. Additionally, TCE concentrations in soil and further information into the vapor intrusion pathway for indoor air is to be investigated. The study plans to collect vapor intrusions samples (sub-slab, indoor and outdoor air) at 5 building throughout the plumes (1206, 1190, 1183, 1168, and 3180). |
Anna Iverson |
| 6/26/2014 |
Site Visit |
CS staff participated in an all-day site visit with EPA and USAF personnel. Sites visit included WP45/SS57, ST58, SS67, SS62, DP44, LF02, LF06 and LF07. Construction was on going at WP45/SS57, during construction no high level reading of TCE has been found. ICs remain in place at site, with some monitoring wells experiencing frost heave. |
Anna Iverson |
| 11/10/2014 |
Document, Report, or Work plan Review - other |
The AF submitted 2013 Final Supplemental Remedial Investigation for WP45/SS57. Received November 2014. This RI hope to better delineate contaminates currently found on site, through analysis of including TCE (Trichlorothene), DRO, cis-DCE (cis-1, 2-dichloroethene), VC (vinyl chloride), and benzene in both soil and groundwater. Soil analysis shows DRO and TCE, generally are found together, and in areas where TCE is found alone, much lower TCE concentration were noted. In shallow groundwater TCE, cis-DCE and VS are found in high concentrations, TCE appears to be low in deep aquifers. Vapor intrusions studies were conducted, but due to the incomplete nature of the vapor intrusion assessment additional studies are needed. There was also a lack of sampling for perfluorinated compounds, which are believed to be present at this site. |
Anna Iverson |
| 8/7/2015 |
Document, Report, or Work plan Review - other |
DEC and EPA provided joint comments to the USAF on the "Draft After-Action Report, Vapor Intrusion Investigation for Source Area WP45/SS57, July-August 2014 and February 2015 Sampling Events" dated June 30 2015 (WP45/SS57 VI report). The WP45/SS57 VI report describes portions of a supplemental remedial investigation at Eielson Air Force Base, focused on vapor intrusion risks at buildings in the WP45/SS57 source area. |
Melinda Brunner |
| 9/22/2015 |
CERCLA RI Plan Approved |
Joint approval issued by EPA and DEC for the final "Remedial Investigation / Feasibility Study Management Plan For Operable Units 3, 4, and 5 Source Areas, Eielson Performance-Based Remediation, Eielson Air Force Base, Alaska" dated September 2015 (OU 3, 4 & 5 RI/FS MP). The OU 3, 4 & 5 RI/FS MP describes planned remedial investigations at 23 contaminated sites at Eielson Air Force Base, including WP45. |
Melinda Brunner |
| 9/22/2015 |
CERCLA RI Plan Approved |
DEC and EPA jointly approved the "2015 Annual Field Sampling Plan, Eielson Performance-Based Remediation, Eielson Air Force Base, Alaska" dated September 2015 (FSP). The FSP describes remedial investigations planned for 2015 at 21 contaminated sites at Eielson Air Force Base, including WP45. The FSP is meant to be used in conjunction with the appropriate remedial investigation/feasibility study (RI/FS) management plan(i.e. OU 3,4,& 5) and the Programmatic Quality Assurance Project Plan. |
Melinda Brunner |
| 11/25/2015 |
Update or Other Action |
DEC & EPA issued a joint letter concurring with the USAF's proposal to defer completion of the remedial investigation (RI) and feasibility study (FS) at WP045 and SS057 to 2018. The proposal was based on the need to do further investigation beyond the already completed supplemental RI and vapor intrusion investigation. |
Melinda Brunner |
| 12/29/2015 |
Site Characterization Report Approved |
DEC and EPA issued a joint approval letter for the "After-Action Report, Vapor Intrusion Investigation for Source Area WP45/SS57, July-August 2014 and February 2015 Sampling Events" dated 4 December 2015. |
Melinda Brunner |
| 7/22/2016 |
Institutional Control Compliance Review |
DEC and EPA Approved the Final 2016 Installation-Wide Monitoring Program Quality Assurance Project Plan Addendum No. 5. The IWMP QAPP Add. 5 updates the 2012 IWMP QAPP for the 2016 field season. Changes and additions to the existing network of monitoring wells were described. |
Monte Garroutte |
| 8/5/2016 |
Document, Report, or Work plan Review - other |
DEC Reviewed the OU 3,4,5 RI/RA report. This report included the characterization of multiple sites.
|
Monte Garroutte |
| 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 |
| 7/18/2017 |
Document, Report, or Work plan Review - other |
DEC reviewed and provided comments on the Installation-Wide Monitoring Program, 2016 Groundwater Monitoring Report, Eielson Air Force Base, Alaska (June, 2017). |
John O'Brien |
| 8/6/2018 |
CERCLA ROD Periodic Review |
DEC evaluated "Fifth Five-Year Review Report for Eielson Air Force Base, Alaska" draft dated April 2018 and issued comments. |
Bri Clark |
| 8/10/2018 |
Institutional Control Periodic Reporting |
DEC and EPA reviewed the "Installation-Wide Monitoring Program 2017 Groundwater Monitoring Program" for Eielson Air Force Base, Alaska dated March 2018 and issued comments. |
Bri Clark |
| 12/19/2018 |
Document, Report, or Work plan Review - other |
DEC reviewed and issued a secondary round of comments on the, "Draft Final Supplemental Remedial Investigation/Risk Assessment Report for OU3,4,5 Source Areas, Eielson Performance-Based Remediation, Eielson Air Force Base, Alaska," dated October 2018. |
Bri Clark |
| 12/19/2018 |
Document, Report, or Work plan Review - other |
DEC reviewed and provided comments on the "Draft Installation-Wide Monitoring Program Quality Assurance Project Plan, Addendum No. 8, Eielson Performance-Based Remediation, Eielson Air Force Base, Alaska," dated November 2018. |
Bri Clark |
| 2/13/2019 |
Institutional Control Periodic Reporting |
DEC and EPA approved the Installation-Wide Monitoring Program 2017 Groundwater Monitoring Report, Eielson Air Force Base, Alaska, dated January 2019. |
Bri Clark |
| 3/4/2019 |
Institutional Control Periodic Reporting |
DEC issued comments on the Draft Installation-Wide Monitoring Program 2018 Groundwater Monitoring Report, Eielson Air Force Base, Alaska, dated January 2019. This report describes the groundwater monitoring activities conducted installation-wide in 2018. |
Bri Clark |
| 10/17/2019 |
Document, Report, or Work plan Review - other |
DEC provided a response to the air force responses to DEC comments for the Supplemental Remedial Investigation/Risk Assessment Report for OU3,4,5 Source Areas, Eielson Performance-Based Remediation, Eielson Air Force Base, Alaska. A comment resolution meeting was recommended. |
Dennis Shepard |
| 8/11/2020 |
Document, Report, or Work plan Review - other |
DEC received a response to comments and a Final Revision 1 Supplemental Remedial Investigation/Risk Assessment Report for OU- 3,4,5 Source Areas, Eielson Performance Based Remediation, Eielson Air Force Base, Alaska, dated August 2020. This report summarizes remedial investigation (RI)/risk assessment (RA) activities conducted from 2015 through 2018 at Source Areas LF001, LF002, LF003/FT009, LF004, LF006, WP032, WP033, SS036, SS037, DP044, WP045/SS057, DP055, ST056, SS061, and SS064 on Eielson Air Force Base. |
Dennis Shepard |
| 3/5/2021 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 71362 Drywell. |
Cascade Galasso-Irish |
| 6/2/2021 |
CERCLA RI Report Approved |
The U.S. Environmental Protection Agency (EPA) and Alaska Department of Environmental Conservation (DEC) provided joint approval of the Final Supplemental Remedial Investigation/Risk Assessment Report for OU3,4,5 Source Areas, Eielson Air Force Base (May 2021). The report summarizes remedial investigation (RI)/risk assessment (RA) activities conducted from 2015 through 2018 at Source Areas LF001, LF002, LF003/FT009, LF004, LF006, WP032, WP033, SS036, SS037, DP044, WP045/SS057, DP055, ST056, SS061, and SS064 on Eielson Air Force Base. |
Dennis Shepard |
| 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 |
