| 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...). |
Louis Howard |
| 8/17/1994 |
Underground Storage Tank Site Characterization or Assessment |
500 gallon single-walled UST (AFID 21 STMP ID 343 ADEC UST# 21) and associated piping removed from building 22-021. It was used to store waste oil from an oil water separator located approximately 3 feet north of the tank under the adjacent building. Tank was installed in June of 1990 and was active until August 1994. No record of a tank tightness test being done at this site. Ship Creek is located approximately 1,200 ft. southeast of the site. Calculated depth from tank bottom at 7 ft. to the shallow aquifer is approximately 28 ft.
Category "B" cleanup criteria was calculated for the site. Diesel contamination was detected above level "B" criteria in the center of the excavation. DRO in the stockpile was found to be 1,400 mg/kg, but the confirmation sample from center of excavation was 213 mg/kg DRO. PCBs, TCLP Metals, HVOCs were all non-detect. |
Louis Howard |
| 8/17/1994 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST Site created in CSP for source area ID 77301 |
Former Staff |
| 8/17/1994 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
|
Former Staff |
| 8/17/1994 |
Site Added to Database |
|
Former Staff |
| 7/31/1995 |
Update or Other Action |
UST Site Assessment Final Report AK UST # 21 near bldg. 22-021. Report documents excavation, sampling, and analysis of soils associated with permanent removal of a 500 gallon used oil underground storage tank (UST) and associated piping near building 22-021. The tank and piping appeared to be in good condition and were connected correctly, however, there were signs of leakage from the "no hub" fitting connections.
The majority of the field screening PID readings taken in the tank excavation hole ranged from
0.0 to 2.4 parts per million (ppm) by volume of volatile hydrocarbons in soil vapor. The highest
PID reading for the tank pit was 427 ppm at 5 feet below grade on the west side of the tank pit.
This soil was removed during the excavation, and the hydrocarbon impact did not appear to
extend laterally into the walls of the excavation. In the vicinity of the soil analytical sample
locations, PID readings of 313 ppm at the north end of the tank pit and 75 ppm at the center of
the tank pit were recorded. Field screening PID results from the soil stockpile were 435 ppm at
the south end and 110 ppm at the north end. The PID readings were used to pinpoint sample
locations. Tank pit floor results show DRO impact. The vertical extent is unknown. Impacted
soil is unknown.
Two (2) samples were collected from the bottom of the excavation at 8 ft. bgs and three samples from the soil stockpile. Soil samples from excavation were all below the cleanup level "A" and DRO was detected at a maximum concentration of 1,400 mg/kg from the south end of the stockpile.
Recommendations: Based on field screening, lab results, and ADEC cleanup standards, a soil boring sholuld be placed directly down gradient from the tank site to determine if ground water has been impacted by hydrocarbons. Additional sampling should be completed inside the building around the oil water separator and piping to better determine the volume of impacted soil. NOTE: Temperature in cooler upon receipt from EA Remediation was 8.8 degrees celsius and temperature of water in temp bottle was 5.6 degrees celsius. |
Louis Howard |
| 10/17/1996 |
Update or Other Action |
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 |
| 3/31/1999 |
Update or Other Action |
Summary Report for Site Evaluations and Bioventing Studies at SERA Phase V sites FINAL. ST SOl consists of one former underground storage tank (UST), UST 21, which was a 5OO-gallon waste oil tank located near Building 22-021, in the southern part of Elmendorf AFB. UST 21 was removed in 1994, and environmental samples were taken during the excavation. The samples collected from the excavation indicated diesel range organics (DRO) and gasoline range organics (GRO)
concentrations above Alaska Cleanup Matrix (ACM) level B criteria. UST 21 was replaced with a 1000-gallon tank.
Soil samples from two bioventing borings (5-7.5' and 10-12.5' bgs) were all below level "A" cleanup levels. |
Louis Howard |
| 6/7/2003 |
Update or Other Action |
Decision document from the Air Force received.
Elmendorf Air Force Base (AFB) site ST501 is located near Building 5327 (former Building 22-021), Zone 2 Maintenance, on Kenney Avenue. The site is located 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 (AFID) number 21, Alaska Department of Environmental Conservation (ADEC) number 274, and Storage Tank Management Plan (STMP) number 343. The tank was removed in 1994 and replaced with a new 1,000-gallon UST. Any release from this UST would have been regulated by 18 AAC 75 Contaminated Site regulations, Articles 3 and 9, and Alaska Statute 46.03 - 46.09.
The UST and piping were removed and the UST site assessment was conducted in 1994. The UST and piping appeared to be in good condition; however, there was some evidence of leakage under fitting connections. Potentially contaminated soil removed from the excavation was stockpiled on site. Soil encountered during this excavation was described as silty gravel, according to the Unified Soil Classification System.
Two analytical soil samples were collected from the bottom of the excavation, at approximately 8 feet below ground surface (bgs), and three samples were collected from stockpiled soil. Since the UST contained waste oil, samples were analyzed for: gasoline-range organics (GRO); diesel-range organics (DRO); residual-range organics (RRO); benzene, toluene, ethylbenzene, and total xylenes (BTEX); halogenated volatile organic compounds (HVOC); polychlorinated biphenyls (PCBs); and leachable arsenic, cadmium, chromium, and lead.
In the excavation, DRO was detected at a maximum concentration of 213 milligrams per kilogram (mg/kg). No other compounds were detected at significant concentrations. Fuel constituents were detected in stockpiled soil; however, this soil was removed from the site for treatment. The new UST was installed at the site and the excavation was backfilled with clean fill.
During the State-Elmendorf Environmental Restoration Agreement (SERA) V investigation in 1996, two borings were drilled to the water table. The borings were placed about 7 feet away from the replacement tank. A split spoon sampler was used to collect soil samples from the ground surface to the water table, which was encountered at 35 feet bgs. Two analytical soil samples were collected from each boring.
Samples were analyzed for GRO, DRO, RRO, and BTEX; all results were less than Method One, Category A cleanup criteria. The method reporting limit for benzene ranged from 0.025 mg/kg to 0.0269 mg/kg, with the exception of one sample. The method reporting limit for benzene for this sample was 0.202 mg/kg due to sample dilution to accurately quantify the volatile petroleum hydrocarbon fraction. All results were below ADEC 18 AAC 75, Method Two cleanup criteria.
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 ST501, Elmendorf AFB, Alaska.
This declaration of decision supports the conclusion that all known sources of contamination have been removed to levels agreed to by the ADEC as being protective of human health and the environment. Therefore, no further action at this site is required.
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. |
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 and/or groundwater contamination is present at all of the 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 B1/B2 found in 18 AAC 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
430/9 513 528 903
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.
During the State-Elmendorf Environmental Restoration Agreement (SERA) V investigation in 1996, two borings were drilled to the water table. Two analytical soil samples were collected from each boring. Samples were analyzed for GRO, DRO, RRO, and BTEX; all results were less than Method One, Category A cleanup criteria. All results were below ADEC 18 AAC 75, Method Two cleanup criteria. In June 2003, the Air Force submitted a summary of the site history, site characterization and cleanup work conducted to date along with a request for No Further Action. ADEC concurred no further remedial action was required for the site in December 5, 2003 letter to Air Force.
ADEC still concurs that no further remedial action is required at ST501 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: 1) 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 |
