| Action Date |
Action |
Description |
DEC Staff |
| 7/2/1990 |
Update or Other Action |
AFOEHL REPORT 90-124EQ00687GHH Hazardous Waste Technical Assistance Survey EAFB (July 1990). Building 11-110 21 Component Repair Squadron (21 CRS) Shop: Engine Repair. Shop personnel perform routine maintenance on the F-100C and F-100D engine. JP-4 (16 gallons/month) drained from the engines is collected in buckets, drummed, stored at the shop's accumulation site and transferred to the TSD facility for disposal through DRMO as hazardous waste. Engine oil (55 gallons/month) and hydraulic fluid (4 gallons/month) drained from the engines are collected in buckets, drummed, and transferred to the POL rail car. The shop has a bearing room; however, only minimal amounts of waste are generated here. Citrikleen (5 gallons/month) is used for cleaning shop floors. The shop floor drains are connected to an oil/water separator. |
Louis Howard |
| 4/11/1991 |
Update or Other Action |
Tracer Tight Test of one (1) Underground Storage Tank (UST) at Facility 11400 January 28, 1991 prepared for VRCA Environmental Services. Tanks were inoculated with tracer November 27, 1990 to a level of approximately 10 ppm. Samples were collected on January 2, 1992. Tank 1 with waste oil product 300 gallon in size leak status was found to be failed. |
Louis Howard |
| 1/13/1992 |
Update or Other Action |
Spill report taken by Doreen Sullivan-Garcia from Mr. Larry Opperman. Facility 11-400 has a 300 gallon waste JP-4 tank empty at this time showed vapor test failed. Tank has 12 inches of water in it and is near site SP-13 diesel site 1986 report. |
Doreen Sullivan-Garcia |
| 10/2/1992 |
Update or Other Action |
State Elmendorf Environmental Restoration Agreement signed. The agreement is designed to remedy environmental contamination due to past practices at the Base and avoid the expense of formal enforcement proceedings. The Air Force will perform any necessary assessment, monitoring, remediation, and closure of the sites. The agreement addresses the following program areas: solid waste, underground storage tanks (USTs), and petroleum oil and lubricants (POL) spills. |
Louis Howard |
| 3/26/1993 |
Update or Other Action |
DOD & ADEC joint Technical Memorandum of understanding signed concerning the Basewide Groundwater (gw) signed by: ADEC Jennifer Roberts RPM & USAF Joseph Williamson Chief Environmental Programs & Restoration. Due to the basewide gw study & the FY92 field work that occurred at Operable Units (OUs) 1, 2, & 5 it appears a large portion of the gw flows into OU5 (attach. 1-contour map). Based on this fact, Elmendorf (EAFB) will move all upgradient gw into the OU5 Feasibility Study, Proposed Plan & Record of Decision (ROD). This means addressing all gw from upgradient sources (CERCLA (ST20, Ous 3&4) & OUs 1 & portions of OU2) & SERA) at OU5 instead of at each individual source area (see attach. 2-Area Map). Sites with free phased product would be looked at to see if there is an available technology to clean them up in a cost effective way. Soil contamination would be addressed at the source areas. NOTE: addressed at the source areas is interpreted by ADEC as removal through excavation or active treatment systems (e.g. high vacuum extraction, bioventing, etc...). Also included in the letter is the AF memo: Restricted Use of the Shallow Aquifer on EAFB signed by William R. Hanson P.E. GM-14 Chief Environmental Flight dated October 17, 1996 Memorandum for 3 SPTG/CEC/CEO from 3 SPTG/CEV
1) Due to the contamination & commitments to EPA/DEC the use of the shallow aquifer for any purpose on is not allowed. Attached Facilities Board minutes-03/29/1994 0930 Item 9 has Mr. William Hanson, briefing the Board on the policy to not use the shallow aquifer due to contamination. The Board approved this policy. Minutes approved by Thomas R. Case Brigadier General USAF Commander. The IRP has RODs for OUs 3 & 6 which require, the aquifer remain unused. 2) Personnel in the review process within CES must be aware of these policies & review them on a recurring basis. It is imperative this restriction be recognized & observed during engineer reviews & operations. |
Jennifer Roberts |
| 12/31/1994 |
Underground Storage Tank Site Characterization or Assessment |
Final Site Assessment-Results of the site assessment show that no waste oil related contaminants are in the soil which exceed the cleanup levels developed for this site based on ADEC's guidelines. It is recommended that UST 165 be permanently closed: removal of the UST, along with associated piping, followed by preparation of a closure report for submission to ADEC. Soil borings were installed near the UST and field screening with a PID was conducted continuously during the placement of the two borings. One soil sample was collected from each boring and analyzed.
This site assessment was not intended to define the horizontal and vertical extent of contamination but to determine the presence or absence of petroleum contamination. |
Louis Howard |
| 2/2/1995 |
Update or Other Action |
Ron Klein letter to Larry Opperman UST program manager for Air Force regarding Waiver of 15 day notification period for closure of UST at UST Facility ID 1525 Tank ID 165. The requested documentation as specificied in 18 AAC 78.090(c)(1) has been satisfactorily furnished. The Department grants the requested waiver for closure to occur beginning on March 1, 1995. The site assessment must be done in accordance with the CORPS approved QAPP. All closure activities must be supervised by a person certified under 18 AAC 78.400-78.495. Upon removal, the tank and associated piping must be emptied, cleaned, removed and disposed as specified in 18 AAC 78.085. A site assessment as required by 18 AAC 78.090 must be performed and submitted with a post closure notice within 30 days of completing closure activities. Any release reporting and corrective action must be done in accordance with 18 AAC 78.220-18 AAC 78.280. |
Ron Klein |
| 4/21/1995 |
Update or Other Action |
Air Force Memorandum to John Halverson (ADEC) re: 18 April 1995 UST meeting.
1. Elmendorf AFB will accomplish the following actions regarding UST projects. These actions are based upon conversation between, John Mahaffey, Larry Opperman and yourself.
a. EAFB will make every effort to accomplish clean closure of a UST removal if possible.
b. UST removal locations requiring cleanup action will be transferred into the State Elmendorf Environmental Restoration Agreement (SERA). A list of sites requiring cleanup will be coordinated with your office.
c. The presumptive remedy for contaminated UST sites in the outwash plain only will be bioventing technology.
d. Contaminated soils exceeding cleanup levels may be placed back into the excavation only if the site assessment (SA) indicates a need for further action.
e. Contaminated UST sites not in the outwash plain will require further investigation to determine appropriate cleanup options.
f. We will make every attempt possible to assure new USTs or new aboveground tanks are not installed in any way that would hamper future access for cleanup.
g. The project will first accomplish removal of all the USTs. SA information will be used to prioritize sites for cleanup using existing project funds. Additional funding will be requested to complete cleanup if available. Sites not addressed for cleanup due to exhausted funding will be placed in SERA Phase IV.
John Halverson signed memorandum on April 21, 1995. Memorandum submitted by Douglas G. Tarbett, Maj. USAF, Chief, Environmental Compliance (CCs 3 WG/JA and 3 SPTG/CE).
|
John Halverson |
| 6/29/1995 |
Site Added to Database |
|
Former Staff |
| 6/29/1995 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST Site created in CSP for source area ID 77726 ADD; Waste oil contamination. |
Ron Klein |
| 8/11/1995 |
Offsite Soil or Groundwater Disposal Approved |
John Halverson approved the Air Force's request to thermally remediate contaminated soil excavated as part of oil/water separator and UST 165 at the Hush House. 16,000 mg/kg Total Petroleum Hydrocarbons, diesel range petroleum hydrocarbons 12,000 mg/kg, gasoline range petroleum hydrocarbons 840 mg/kg and total BTEX 61.3 mg/kg are the sample results from the soil. No HVO, PCB, or significant metals were detected. (ASR on Sept. 23, 1995 confirmed treatment of 151.30 tons of petroleum impacted soils from tank 165). |
John Halverson |
| 8/31/1995 |
Update or Other Action |
1995 UST Removal: Five soil samples were collected from the excavation and analyzed for
GRO, DRO, BTEX compounds, total petroleum hydrocarbons (TPH), halogenated volatile
organics (HVOCs), PCBs, arsenic, cadmium, chromium, lead and PAHs. DRO was detected in
two samples at 2,100 and 7,000 mg/Kg, both of which exceeded the cleanup level. One sample
also contained GRO (730 mg/Kg), benzene (0.96 mg/Kg) and toluene (9.8 mg/Kg) exceeding
cleanup levels. All other results were below cleanup levels. Both of these samples were
collected from the oil-water separator (OWS) vault excavation. |
John Halverson |
| 9/23/1995 |
Update or Other Action |
ASR letter to J Halverson ADEC re: Soil Disposal From HUSH House Tank 165 Elmendorf AFB. On August 16, 1995 ASR received 151.30 tons of petroleum impacted soil from EAFB. On August 26, 1995, thermal treatment of this soil was completed at ASR's facility and meets ADEC's most restrictive level ""A"" critiria. |
John Halverson |
| 10/17/1996 |
Institutional Control Record Established |
Air Force memo: Restricted Use of the Shallow Aquifer on EAFB signed by William R. Hanson P.E. GM-14 Chief Environmental Flight dated October 17, 1996 Memorandum for 3 SPTG/CEC/CEO from 3 SPTG/CEV
1) Due to the contamination & commitments to EPA/DEC the use of the shallow aquifer for any purpose on is not allowed. Attached Facilities Board minutes-03/29/1994 0930 Item 9 has Mr. William Hanson, briefing the Board on the policy to not use the shallow aquifer due to contamination. The Board approved this policy. Minutes approved by Thomas R. Case Brigadier General USAF Commander. The IRP has RODs for OUs 3 & 6 which require, the aquifer remain unused. 2) Personnel in the review process within CES must be aware of these policies & review them on a recurring basis. It is imperative this restriction be recognized & observed during engineer reviews & operations. |
Louis Howard |
| 3/31/1997 |
Underground Storage Tank Site Characterization or Assessment |
SERA IV - In 1996 and 1997, four soil borings were installed during the SERA Phase IV investigation. Two soil samples were collected from each boring and analyzed fro GRO, DRO, RRO, and BTEX compounds. GRO (750 mg/kg) and DRO (3,600 mg/kg) exceeded cleanup levels in the sample collected near the former OWS vault at 16 ft. bgs. All other results were below cleanup levels. Hydrocarbon contamination (GRO, DRO, benzene, and toluene) is present at ST410 from the bottom of the excavation (approximately 14 feet bgs) to the groundwater interface (27 feet bgs). The vadose zone contamination detected appears to be localized to the OWS area. DRO contamination was also detected in the smear zone in boring 410PZ02, located approximately 80 feet downgradient of the site.
ST410 is a former UST and O/W separator site at the old hush house (bldg. 11-140). The AFID no. 165 had a 500 gallon capacity and contained waste oil. The OW separator was housed in a concrete vault west of the UST and the piping system for both were known to leak and the tank failed a tightness test (AGRA 1995). Five soil samples collected below the OW separator vault and on the north excavation wall adjacent to the OW separator contained elevated POL levels with maximum levels: DRO-7,000 mg/kg, GRO 730 mg/kg, total BTEX at 57.26 mg/kg. No groundwater samples were analyzed. 80 cubic yards of contaminated soil was removed and thermally treated.
The additional characterization at the site showed that the maximum level of GRO was 750 mg/kg, DRO 3,600 mg/kg and total BTEX at 34.94 from sample 410WL01SO16.0N. Conclusions state that site disposition recommendations will be submittted under separate cover pending the completion of risk assessment work on the affected areas. |
Louis Howard |
| 3/25/1998 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
|
Former Staff |
| 6/3/1998 |
Update or Other Action |
Letter from ADEC to Air Force (J. Mahaffey)- RE: Corrective Action for SERA Phase IV Sites. The Alaska Department of Environmental Conservation (Department) has reviewed the release investigations reports received in March of 1997 by the Air Force as part of the SERA IV Release Investigation Project. Based on information contained in the release investigation and previously submitted site assessment reports, the Department requests the Air Force to begin correction action on contaminated soils associated with decommissioned underground storage tanks (UST) at the following sites:
1. ST 401; AFIDs 96-104 associated with Building # 22-013,
2. ST 402; AFID 150, associated with Building # 32-127,
3. ST 403; AFIDs 209 & 229, associated with Building # 22-009,
4. ST 422; AFID 471, associated with Building # 41-701,
5. ST 424; AFID 189, associated with Building # 32-189,
6. ST 405; AFID 335, associated with Building 42-335,
7. ST 419; AFIDs 51 & 52, associated with Building # 41-659,
8. ST 407; AFIDs 575, 576 & 578, associated with Building # 43-575,
9. ST 410; AFID 165, associated with Building “Hush House”,
10. ST 421; AFID 425A, B, C & D, associated with Building # 42-425, and
11. ST 428; AFID130, associated with Building # 1-836.
SERA IV sites not listed above may need further release investigation work, or the contamination may be low enough to justify a “no further action” response.
Since all the SERA IV sites listed above have soil contamination that extends to ground water, and groundwater sampling was not performed as part of the SERA IV release investigations, the Department is assuming the groundwater is also contaminated. The Department is requesting the Air Force to submit a corrective action plan to address the contaminated groundwater, or submit a groundwater sampling plan to find the extent of groundwater contamination associated with the decommissioned UST. |
Tim Stevens |
| 7/31/2001 |
Update or Other Action |
Corrective action plan received for ST410 Tank 165. During the 1996 release investigation a bioventing treatability study was also performed to establish whether bioventing would be suitable for remediation of POL contaminated soils. Results indicated that depleted oxygen and elevated carbon dioxide existed at the contaminated deep interval which were favorable for bioventing. The shallow interval was shown not to be favorable to bioventing. Depth to groundwater is at 27 feet below ground surface. Presumptive remedy was to excavate to 15 ft. bioventing at depths to 15 ft if excavation is not feasible and groundwater monitoring for deep contamination. Details regarding the monitoring network and it is proposed that wells be sampled as part of the basewide monitoring program. Well located at the site 11160-WL-01 is not currently in the monitoring program and well OU5-MW-07 located downgradient of the site is in the program. |
Louis Howard |
| 8/1/2001 |
Update or Other Action |
electronic CAP received- Note no previous PCB, Metals, or solvent analysis. New OWS/UST intalled at LUST site. USAF is checking as-built to see if this is a regulated UST. Soil will need to be stockpiled and sampled proir to approval for thermal treatment at ASR. |
Louis Howard |
| 8/15/2001 |
Meeting or Teleconference Held |
Call to John Mahaffey regarding site status. They are looking into some new issues at the site and will update me before they take any action. |
Sharon Sadlon |
| 10/21/2002 |
Update or Other Action |
Letter sent to Joe Williamson dissolving the State Elmendorf Environmental Restoration Agreement. The Alaska Department of Environmental Conservation (DEC) has reviewed the issue of abolishing the State Elmendorf Environmental Restoration Agreement (SERA) per your recommendation. Elmendorf Air Force Base and DEC entered into the SERA in 1992. The agreement was developed as a tool to bring the Base into compliance with Alaska's regulations addressing underground storage tanks, oil and other hazardous substance releases and solid waste.
Since that time, Elmendorf has made significant progress in investigating and cleaning up historic contamination problems. Many of the sites covered by the SERA have been successfully cleaned up and closed. Cleanup is underway at the remaining sites.
Additionally, Alaska has amended the regulations addressing fuel storage tanks, oil and other hazardous substance spills and solid waste. We concur with you that the SERA is no longer a necessary or beneficial. This letter serves as notice that DEC will end oversight on environmental work at Elmendorf by using the SERA. Instead, it is understood that the sites and programs formerly addressed by SERA: solid waste, underground storage tanks (UST), and oil and other hazardous substance discharges will be addressed in accordance with 18 AAC 60, 18 AAC 78 and 18 AAC 75. |
Jennifer Roberts |
| 7/19/2004 |
Conditional Closure Approved |
After reviewing the data and reports submitted for ST410, the Department agrees that no additional remediation or investigation is required for ST410 LUST Event ID 431. However, groundwater monitoring will be required until cleanup levels are achieved.
The Department reserves its rights, under: 18 AAC 75 Contaminated Site regulations, 18 AAC 78 Underground Storage Tank regulations, and AS 46.03 to require additional investigation, cleanup, containment, and/or other necessary actions, if subsequent information indicates: additional contamination remains at the site which was previously undiscovered and presents an unacceptable risk to human health, safety, or welfare, or the environment. |
Louis Howard |
| 7/19/2004 |
Long Term Monitoring Established |
Excavation is not recommended because the highest levels of contamination were detected next to the building foundation and the highest contamination levels were detected from 14 to 26 feet bgs. The replacement UST and OWS installed at this location are currently in-use and support mission-critical operations at the Hush House. The area is covered by asphalt and located in a secure fenced area on the airfield.
This site is located within the OU5 modeling area as identified in the Operational Agreement (OA) between ADEC and Elmendorf AFB signed 28 July 2002. In the OA, both parties agree that the portion of the unconfined shallow aquifer in the outwash plain has demonstrated, through modeling and sampling, the ability to naturally attenuate residual hydrocarbon contamination from most petroleum, oil, and lubricant (POL) spills in a reasonable period of time.
The Elmendorf AFB Basewide Groundwater Monitoring Program will be utilized to monitor groundwater during implementation of the remedy. The nearest downgradient monitoring well currently in the Basewide Groundwater Monitoring Program is 61-WL-02, located approximately 600 feet southwest of ST410. The Elmendorf AFB Basewide Groundwater Monitoring Program will be utilized to monitor groundwater during implementation of the remedy. The nearest downgradient monitoring well currently in the Basewide Groundwater Monitoring Program is 61-WL-02, located approximately 600 feet southwest of ST410. The Elmendorf AFB Basewide Groundwater Monitoring Program will no longer exist after this year. Please confirm that your contractor will be monitoring the well specified in the closure document submitted for this site and that the zone project manager is aware that the monitoring requirements for the compliance wells may be different than what is being required for under the CERCLA program. For the compliance site known as ST410, the Department will require sampling for DRO, GRO, and BTEX in the monitoring well identified above. |
Louis Howard |
| 7/26/2004 |
Document, Report, or Work plan Review - other |
Basewide Groundwater Monitoring General Comment: If PAHs were analyzed for in groundwater at any site where groundwater monitoring was conducted and results were below Table C cleanup criteria, then PAHs may be struck from the analyses in future sampling events. However if analyses for polynuclear aromatic hydrocarbons (PAHs), specifically: acenaphthene, anthracene, benzo-a-anthracene, benzo-a-pyrene, benzo-b-fluoranthene, benzo-k-fluoranthene, chrysene, dibenzo-a,h-anthracene, fluorene ideno-123-cd-pyrene, naphthalene, and pyrene, was not conducted, then PAHs analyses will be required during groundwater monitoring until shown to be not of concern (i.e. below Table C cleanup criteria). Site Specific Comments: ST410 The text states: The Elmendorf AFB Basewide Groundwater Monitoring Program will be utilized to monitor groundwater during implementation of the remedy. The nearest downgradient monitoring well currently in the Basewide Groundwater Monitoring Program is 61-WL-02, located approximately 600 feet southwest of ST410.
The Elmendorf AFB Basewide Groundwater Monitoring Program will no longer exist after this year. Please confirm that your contractor will be monitoring the well specified in the closure document submitted for this site and that the zone project manager is aware that the monitoring requirements for the compliance wells may be different than what is being required for under the CERCLA program. For the compliance site known as ST410, the Department will require sampling for DRO, GRO, and BTEX in the monitoring well identified above. |
Louis Howard |
| 2/18/2005 |
Update or Other Action |
February 18, 2005 list of sites sent which includes ST410. Well ID 61WL-02 will be sampled on a Biannual basis for GRO, BTEX and DRO. Each well presented in the table submitted will be sampled in 2005 to establish baseline COC concentrations. Proposed sampling frequencies would thus take effect in 2006. An annual sampline frequency has been assigned to sites near the OU5 Bluff whereas all other sites received a biannual frequency. |
Louis Howard |
| 7/6/2006 |
Update or Other Action |
2005 Annual Report Monitored Natural Attenuation of Basewide Compliance Program Wells received. Currently, the 3 CES/CEVQ is required by ADEC to monitor the degree to which certain regulated contaminants are naturally attenuating on 27 sites throughout the Base. The natural attenuation of each of these sites is being monitored by sampling and analyzing the groundwater under the contaminated areas and/or downgradient of the contaminated source.
In 1995, 1996, and 1997, GRO, DRO, benzene, and toluene contamination remained in the smear zone soil and groundwater in the former UST area at ST410. In 2005, groundwater at monitoring well 61WL-02, located hydraulically downgradient of ST410, did not have detectable concentrations of GRO, DRO, or BTEX compounds. |
Louis Howard |
| 3/12/2007 |
Exposure Tracking Model Ranking |
Intitial Ranking Complete for Source Area: 77726 (Autogenerated Action) |
|
| 6/20/2007 |
Update or Other Action |
Staff reviewed and commented on the 2006 Annual Report Monitoring of Compliance Program Sites, Elmendorf Air Force Base (EAFB) dated May 2007. ADEC concurs with the recommendations in this section regarding groundwater sampling at 410MW-IN. |
Louis Howard |
| 7/5/2007 |
Update or Other Action |
Staff reviewed and commented on the Draft Work Plan and Field Sampling Plan Compliance Program Sites, Elmendorf Air Force Base (EAFB) dated June 27, 2007. For ST410 the following well will be monitored: 410MW-IN for GRO, BTEX, DRO, and PAHs. ADEC has developed a technical memorandum and a Laboratory Data Review Checklist (checklist) summarizing the minimum requirements for both laboratory data packages and quality assurance (QA) summaries (data reduction, verification, evaluation, etc.).
All reports submitted by the Air Force which contain analytical laboratory sample results shall contain a completed checklist and a QA summary. The latest checklist is available online at http://www.dec.state.ak.us/spar/guidance.htm#csp and must be completed, signed and dated by the firm submitting the report to ADEC. It is not to be completed by the analytical laboratory that performed the sample analysis. The summary must be included as a specific text section of the report. All laboratory results, including laboratory quality control (QC) sample results, must be reviewed and evaluated for quality, validity and usability. The text must include any effects on data validity and/or usability due to field sampling/laboratory quality control discrepancies. Upon incorporation of comments regarding the checklist, ADEC will approve the work plans |
Louis Howard |
| 5/20/2009 |
Update or Other Action |
Draft Groundwater monitoring report received. Groundwater monitoring well 410MW-IN was sampled. Samples were analyzed by an analytical laboratory for GRO, DRO and BTEX compounds. No contaminants were detected above cleanup levels in the sample. It is recommended that soil samples be collected again from ST410 in 2013 (if funding is available) to determine if vadoze zone soil contaminant concentrations have been remediated to below cleanup levels. Until soil samples are collected, annual groundwater monitoring at well 410MW-IN should continue for GRO, DRO and BTEX compounds. |
Louis Howard |
| 5/28/2009 |
Document, Report, or Work plan Review - other |
Draft 2008 Annual Report, Compliance Program Elmendorf AFB May 11, 2009 reviewed and commented on by staff. Table 7-1 Page 7-3: The GRO cleanup level has been revised as of October 9,2008 to 2,200 ugiL from 1,300 ugiL. The cleanup level for toluene is 1.0 mg/L or 1,000 ug/L not 100 ug/L as listed in the table.
7.3 ST410 Conclusions and Recommendations Page 7-3: ADEC concurs with the recommendations that soil samples be collected again from ST410 in 2013 (if funding is available) to detennine ifvadoZise zone soil contaminant concentrations have been remediated to below cleanup levels. Until soil samples are collected, annual groundwater monitoring at well 41 OMW-IN should continue for GRO, DRO and BTEX compounds. Note, vadose zone is misspelled as "vadoze". Check document for this misspelled word. |
Louis Howard |
| 4/15/2010 |
Update or Other Action |
2009 Annual Report for monitoring of compliance program sites received. Elmendorf AFB site ST410 is located south of Building 9561, a Hush House for jet engine testing. The site is located near the intersection of Slammer Avenue and Simpson Harbor Drive, on the south side of the East/West Runway. ST410 is the former location of a 500- gallon UST which received waste oil from an OWS. The piping system associated with the OWS and UST was known to leak, and the UST failed a tightness test conducted prior to 1995. The UST and OWS were removed in 1995.
Monitoring well 410MW-IN was sampled using the approved procedures provided in the 2008
Final Work Plan (USAF, 2009c). Samples were analyzed by an analytical laboratory for GRO,
DRO and BTEX compounds. No contaminants were detected above cleanup levels in the sample.
In 1995, 1996, and 1997, concentrations of GRO, DRO, benzene, and toluene remained in the
soil and groundwater above cleanup levels at ST410. In 2006, 2007, and 2008, groundwater at
the in-source monitoring well 410MW-IN did not have concentrations of these contaminants
above cleanup levels.
The 2008 Annual Report (USAF, 2009c) recommended that soil samples be collected again from
ST410 in 2013 (if funding is available) to determine if vadose zone soil contaminant
concentrations have been remediated to below cleanup levels. ADEC subsequently concurred
with the recommendation (ADEC, 2009a). This is still recommended. Until soil samples are
collected, annual groundwater monitoring at well 410MW-IN should continue for GRO, DRO
and BTEX compounds. |
Louis Howard |
| 7/9/2010 |
Document, Report, or Work plan Review - other |
Staff reviewed and commented on the 2009 Annual Report Monitoring of Compliance Program Sites, Elmendorf Air Force Base (EAFB) dated June 2010.
Worksheet #30 Page 57 of 67
ST410 is the former location of a 500-gallon UST which received waste oil from an OWS. Currently, ST410 has not contaminants of concern detected above cleanup levels in groundwater. It does not appear that analyzing for EDB and 1,2-DCA in soil or groundwater appear warranted at this time. |
Louis Howard |
| 8/9/2010 |
Document, Report, or Work plan Review - other |
Staff reviewed and commented on the 2010 Environmental Compliance Work Plan Elmendorf Air Force Base, July 2010.
14.5 Worksheet #14E – ST410 Sampling Tasks Page 14-9
The text states: “Analytical samples will be collected from the locations with the highest PetroFLAG screening result.” If PetroFLAG results are negative or below a preset limit, the Air Force shall collect three soil samples from the soil boring: one sample will be collected from the upper 10 feet bgs; one sample will be collected at or near the water table, and one will be collected from a depth between the surface and the water table.
|
Louis Howard |
| 3/16/2011 |
Update or Other Action |
2010 Annual Report for Monitoring of Compliance Restoration Program Sites received. Monitoring well 410MW-IN was sampled. Samples were analyzed by an analytical laboratory for GRO, DRO and BTEX compounds. No contaminants were detected above cleanup levels in the sample. Soil samples were also collected for this site in 2010. Soil samples were collected by a separate
contractor and results are being provided in a separate report. Conclusions and recommendations for this site are provided in the closure sampling report prepared under separate cover |
Louis Howard |
| 5/2/2011 |
Update or Other Action |
Staff received the 2010 Closure Sampling Summary Report Compliance Program Sites ST410, ST509, ST532, & Building 16716 JBER-Elmendorf, Alaska. The purpose of this project was to advance & sample one soil boring at each site (ST410, ST509, ST532, & Building 16716) & evaluate the analytical results against the Alaska Administrative Code (AAC), Title 18, Chapter 75, Method Two criteria (ADEC 2008) to assess whether cleanup is complete. Annual compliance monitoring of GW quality from 2006 to 2009 has indicated no contaminants remain above the ADEC cleanup levels in GW at these sites; therefore, only soil samples were collected in September 2010 & analyzed as recommended in the 2009 Annual Report: Monitoring of Compliance Program Sites.
ST410 is directly south of Building 9561, west of Runway 34-16 & east of the intersection of Slammer Avenue & Simpson Harbor Drive. Building 9561 is a “Hush House” used for jet engine testing. ST410 was the site of a former 500-gallon UST that stored waste oil from an oil-water separator (OWS). The piping system associated with the OWS & UST was known to leak, & the UST failed a tightness test conducted prior to 1995. The UST, OWS, & associated piping were removed in 1995.
In September 2010, sampling was conducted at ST410 to determine if remediation was complete. Soil samples were analyzed for previously detected contaminants (GRO, DRO, & BTEX), as well as RRO, VOCs, & PAHs. No contaminant was detected above ADEC cleanup levels in any of the soil samples, even near depths of historic exceedances.
In 1995, the source of contamination including the UST, OWS, & associated piping, was removed from ST410 & initial soil samples were collected to determine if future monitoring or cleanup efforts were necessary. Results of this effort indicated that DRO, GRO, & BTEX contamination existed at the site in excess of ADEC cleanup levels. Additional soil sampling in 1996 revealed GRO & DRO contamination above the cleanup levels.
A bioventing well was installed & tested in 1996 with the results indicating a bioventing treatment could be useful in reducing contaminant concentrations. However, no record exists of a bioventing treatment ever having been enacted. Monitored natural attenuation was the final remedy of choice for ST410. GW was monitored annually from 2006 to 2009 & samples were analyzed for GRO, DRO, BTEX, & PAHs; no sample results exceeded ADEC cleanup levels.
As recommended in the 2009 Annual Report Monitoring of Compliance Program Sites (USAF 2010b), soil samples from a single boring advanced to GW were analyzed for all COPCs in 2010 to determine if cleanup was complete. All parameters were non detect or below ADEC cleanup levels. Because the most recent GW & soil sampling events revealed no contaminants above ADEC cleanup levels, ST410 is recommended for cleanup complete status. |
Louis Howard |
| 6/17/2013 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 77726 name: Underground storage tank |
Louis Howard |
| 2/7/2023 |
Document, Report, or Work plan Review - other |
DEC reviewed the 2023 Letter Work Plan Remedial Action Operations and Long-Term Management, Draft, dated January 2023. The work plan describes the site inspections, maintenance activities, and groundwater, seep, and surface water monitoring, at multiple sites located on Joint Base Elmendorf- Richardson (JBER), Anchorage, Alaska. The scope of work briefly summarizes the site locations, sampling/monitoring schedules, and activities such as free-product removal from monitoring wells and monitoring/maintenance activities at the Operable Unit 5 wetlands. The details regarding the procedures for the remedial action operations and long-term management activities will remain consistent with the 2021 Uniform Federal Policy Quality Assurance Project Plan (UFP-QAPP). |
Ginna Quesada |
