| Action Date |
Action |
Description |
DEC Staff |
| 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 |
| 9/11/1996 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST Site created in CSP for source area ID 77307 |
Former Staff |
| 9/11/1996 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
|
Former Staff |
| 9/11/1996 |
Site Added to Database |
|
Former Staff |
| 10/15/1996 |
Underground Storage Tank Site Characterization or Assessment |
UST Decommissioning and Site assessment - AFID 179 Utility Airplane Detachment "Repair 17 Underground Storage Tanks Contract # F41624-94-D-8070, Delivery Order # 0006" The report documents the excavation of a 2000 gallon waste oil UST. The excavation was 8' wide by 14' long by 10' deep. During excavation, an unidentified pipe (4 inch) was encountered at 2.5 ft. below ground surface. The pipe was located about 3 feet east of the UST fill pipe. By pouring 30 gallons of clean water down the floor drains of Building 32-179, it was determined that the broken 4 inch line was connected to the in-service oil/water separator also located in Building 32-179. The line was subsequently repaired to bypass the decommissioned UST AFID 179.
Stockpiled soil was field screened for contaminants. No hydrocarbon odor was observed and highest PID was 4.6 on the south wall at 9' depth. No contamination was detected above level "C" criteria for DRO, GRO, BTEX, RRO. No contaminants were detected above most stringent cleanup level (e.g. EPA Reg. III residential RBCs & TSCA) for VOCs, PCBs, and metals. No PAHs were sampled for during this investigation. However, samples were not taken at the broken piping connecting the UST to Bldg. 32-179. Based on the results of field screening and laboratory analyses of soil samples collected in the vicinity of the excavated UST it is recommended that this site be closed with no further action. |
Louis Howard |
| 6/30/1997 |
Update or Other Action |
Site Evaluation and Bioventing Studies for SERA Phase V Sites 1997 Work Plan (FINAL). Document includes: ST509, 510 (AFID 105), 511 (AFID 310), 512 (AFID 326), 513 (AFID 390), 514 (AFID 475), 515 (AFID 580), 516 (AFID 154), 517 (AFID 179), 518 (AFID 245), 519 (AFID 890), 520 (AFIDs 39, 40, & 41), 521 (STMP 426), 522 (STMP 431), 523 (AFID 16), 524 (149), 525 (AFID 330), 526 (AFIDs 700A & 700B), AST 527 (AFID 814), ST528 (AFID 857), 529 (AFIDs 878a & 878b), 530 (AFID 893), 531 (STMP 240) (STMP 240), 532 (STMP 243), 533 (STMP 245 & 246), 534 (STMP 300), 535 (STMP 428), 536 (above ground tanks at Madbull Area I), 537 (above ground tank at Madbull Area II). The excavated soil was not sampled, and was used to backfill the excavation. However, there were no odor of contamination in the stockpile, and the highest detected contamination by the PID was 7.3 ppm from a sample taken next to the fill pipe. No contamination above Level "C" was found at the bottom of the excavation. Recommendation- This site will be recommended for closure with no further action. |
Louis Howard |
| 6/6/2003 |
Update or Other Action |
Decision document received.
Elmendorf Air Force Base (AFB) site ST517 is located south of Building 9311 (former Building 32-179), Hanger 6 - the Utility Airplane Detachment, on Gott Avenue. The site is on the south side of the East/West Runway and is within the OU5 Modeling Area.
Nature of Release
One regulated 500-gallon steel underground storage tank (UST) was used to store waste oil. The tank was identified as Air Force Identification number (AFID) 179 and Alaska Department of Environmental Conservation (ADEC) number 89. The tank was removed in 1996. Any release from this UST would have been regulated by 18 Alaska Administrative Code (AAC) 75 Contaminated Site regulations, Articles 3 and 9, and Alaska Statute 46.03 - 46.09.
Response Action History
The UST and associated piping were removed and the site assessment was completed in 1996. The tank and piping appeared to be in good condition, with some rust, but no obvious holes. Soil encountered during this investigation was described as gravely sand and trace silt, which corresponds to a Unified Soil Classification System classification of SW-SM. The depth to groundwater is estimated to be 30 feet below ground surface (bgs).
Two analytical soil samples were collected from the bottom of the tank excavation, at approximately 10 feet bgs. Since the UST contained waste oil, samples were analyzed for: gasoline-range organics (GRO); diesel-range organics (DRO); residual-range organics (RRO); benzene, tolune, ethylbenzene, and total xylenes (BTEX); volatile organic compounds (VOC); polychlorinated biphenyls (PCB); and arsenic, cadmium, chromium, and lead.
The maximum DRO concentration was 59 milligrams per kilogram (mg/kg) and the maximum RRO concentration was 120 mg/kg. Methylene chloride was detected at 0.069 mg/kg, which exceeds the 18 AAC 75 Method Two cleanup level of 0.015 mg/kg. However, it is commonly used as a solvent in laboratory methods and can likely be attributed to laboratory contamination.
Trichloroethene was detected at 0.019 mg/kg, below the 18 AAC 75 Method Two cleanup level of 0.027 mg/kg. PCBs were detected at a maximum of 0.11 mg/kg, below the 18 AAC 75 cleanup criteria of 1 mg/kg. Metals were detected within background ranges for Elmendorf AFB soils or below 18 AAC 75 Method Two criteria. BTEX and GRO were not detected. The method reporting limit for benzene was 0.012 mg/kg.
All results, with the exception of methylene chloride, were below ADEC 18 AAC 75, Method Two cleanup criteria.
The selected remedy for this site is no further action and site closure. This remedy was selected because this site does not contain potential contaminants above ADEC 18 AAC 75 cleanup criteria nor any potential contaminant sources and does not present a risk to human health or the environment.
In accordance with State of Alaska regulation 18 AAC 75, the United States Air Force (USAF) has completed all activities required for the selected remedy at ST517, Elmendorf AFB, Alaska.
The site has been adequately characterized under 18 AAC 75.335 and has achieved the applicable cleanup criteria under 18 AAC 75 for site closure. However, if additional contamination is discovered at the site which is not protective of human health, safety, or welfare, or of the environment, ADEC will require the USAF to conduct additional actions that meet the requirements of 18 AAC 75 Contaminated Site regulations and Alaska Statute 46.03 – 46.09. |
Louis Howard |
| 12/5/2003 |
Site Closure Approved |
Letter from ADEC (John Halverson) to USAF (John Mahaffey) re: Compliance Funded Contaminated Sites Review and Response. The Air Force submitted thirty-eight (38) decision document packets to the Alaska Department of Environmental Conservation (ADEC) Contaminated Sites Program, Department of Defense oversight section. Each individual packet included a summary of the site history, site characterization and cleanup work conducted to date along with a request for No Further Action. All of the sites are petroleum contaminated sites associated with current or former fuel storage tanks.
Residual soil andlor groundwater contamination is present at all ofthe sites. Based on our
review, thirty-six (36) of the sites (see the list below) do not appear to pose an unacceptable
risk to human health or the environment and are suitable for a No Further Remedial Action
Planned (NFRAP) determination. The ADEC's NFRAP determination indicates that no
additional cleanup is necessary but that institutional controls and/or long term monitoring are
necessary.
We have determined that the groundwater impacts at these sites are being
adequately addressed within the base-wide groundwater monitoring program and the Operable
Unit 5 groundwater treatment system. Because petroleum contaminated soil (contaminant
levels higher than the Method 2 cleanup levels in Tables BlIB2 found in 18 AAe 75.341)
remains at these sites, the Base Master Plan needs to be updated to document the locations of
residual contamination and the need to manage contaminated soil properly during any future
construction or excavation work. Upon notification that the Base Master Plan has been
updated, the ADEC will change the status of these sites in our contaminated sites database to
NFRAP with institutional controls in place.
The following 36 sites eligible for NFRAP (ignoring the ST portion of the title):
404 502 517 535
405 503 518 536
411 504 519 537
413 505/9 520 700
414 511 521 701
415 512 525 902
43019 513 528 903
431 514 530 904
501 515 533 906
Sites ST 420 and 524 are not located within the capture zone for the OU5 treatment system and
contain higher contaminant levels. Therefore, the ADEC is requesting additional site
characterization/cleanup at these two sites. |
John Halverson |
| 12/5/2007 |
Update or Other Action |
Staff commented on the Site Closure Confirmation Request, Environmental Compliance Program, Elmendorf AFB, Alaska dated November 6, 2007 for twenty-three (23) sites submitted by the Air Force’s Environmental Compliance Program. This request was to confirm the sites have met all applicable State of Alaska cleanup regulations.
The UST and associated piping were removed and the site assessment was completed in 1996. The tank and piping appeared to be in good condition, with some rust, but no obvious holes. Two analytical soil samples were collected from the bottom of the tank excavation, at approximately 10 feet bgs. The maximum DRO concentration was 59 milligrams per kilogram (mg/kg) and the maximum RRO concentration was 120 mg/kg. Methylene chloride was detected at 0.069 mg/kg, which exceeds the 18 AAC 75 Method Two cleanup level of 0.015 mg/kg. However, it is commonly used as a solvent in laboratory methods and can likely be attributed to laboratory contamination. Trichloroethene was detected at 0.019 mg/kg, below the 18 AAC 75 Method Two cleanup level of 0.027 mg/kg. PCBs were detected at a maximum of 0.11 mg/kg, below the 18 AAC 75 cleanup criteria of 1 mg/kg. Metals were detected within background ranges for Elmendorf AFB soils or below 18 AAC 75 Method Two criteria. BTEX and GRO were not detected. ADEC concurred that no further remedial action was necessary in a 2003 letter to the Air Force.
ADEC still concurs no further remedial action is required at ST517 and a “Site Closure Approved” action will be entered. ADEC is basing its decision on the most current and complete data provided by the Air Force. ADEC reserves its rights, under: 18 AAC 75 Oil and Other Hazardous Substances Pollution Control regulations (as amended through December 26, 2006), 18 AAC 78 Underground Storage Tank regulations (as amended through October 27, 2006) and Alaska Statute 46.03 to require additional investigation, cleanup, or containment, if subsequent information indicates that: additional contamination remains at the site which was previously undiscovered and presents an unacceptable risk to human health, safety, or welfare, or the environment.
Please note, per 18 AAC 75.325(i), department approval is required prior to disposing of soil or water from a site that is, or has been, subject to the site cleanup rules. |
Louis Howard |
| 7/7/2011 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 77307 name: autogenerated pm edit - Elmendorf - AFID 179 Hangar 6 ST517 |
Louis Howard |
