| Action Date |
Action |
Description |
DEC Staff |
| 5/14/1988 |
Site Visit |
FI; Federal funding. Jensen Consultants performs a tightness test on 6K gallon aviation fuel tank. The tank is tight, however, the piping leaked badly. Test results received by ADEC on 5/17/88. Spill reported by Jensen Consultants on 5/15/88. Spill number 88210113601. Owner intends to abandon UST. |
Former Staff |
| 5/20/1988 |
Leaking Underground Storage Tank Emergency Response |
SC; Federal funding. Owner was in the process of pumping product from the UST. |
Former Staff |
| 5/24/1988 |
Update or Other Action |
REM; Federal funding. Statewide Petroleum Services was retained to pull UST. Contaminated soils placed on and covered with a plastic membrane. The stockpile was diked to hold contaminated mud. ADEC staff Ron Godden monitored the removal and concluded contamination a result of overfill and line leakage. Soil disposal documentation or plan not in project file |
Former Staff |
| 10/16/1989 |
Update or Other Action |
REM; Federal funding. All excavated soil stockpiles with the exception of material from Tank #1 and #3 have been disposed of at the Regional Landfill. Soil from Tank #1 is going to be "land farmed" on-site to reduce TPH levels. Soils from Tank #3 contained dichlorobenzene which complicated disposal possibilities. No record of their disposal in the project file as of 12/31/90. Disposal of contaminated soil at tank no. 3(waste oil) excavation is being pursued by Ron Samsal of AK Dept. of Public Safety, Aircraft Division. |
Former Staff |
| 10/16/1989 |
Update or Other Action |
REM; Federal funding. Statewide Petroleum Services removes 5 USTs from the site. Shannon & Wilson monitors removal. Approximately 330 cubic yards of soils were excavated. Soils left in place at Tank Site #1 have gasoline contamination above ADEC cleanup guidelines. Halogenated volatile organics found at waste oil UST site did not allow immediate backfilling of UST excavation. Groundwater was encountered at 6-8 feet. |
Former Staff |
| 10/24/1989 |
Site Added to Database |
|
Former Staff |
| 10/24/1989 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST Site created in CSP for source area ID 77670 ADD; Petroleum contaminants. |
Former Staff |
| 10/25/1989 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
LCAU; :LCAU Date changed DB conversion |
Former Staff |
| 4/26/1990 |
Leaking Underground Storage Tank Corrective Action Underway |
RAPR; Federal funding. ADEC requests plans for landfarming of tank #1 soils, design for vapor extraction system, and installation of monitoring wells to assess goundwater contamination. The Department of Interior replied on 5/18/90 with a letter of intent. |
Former Staff |
| 7/5/1990 |
Site Visit |
FI; Federal funding. An 8/90 report by DOWL Engineers reported sampling results of 7/90 excavation activity at UST site #1. Sample S-3 taken from soils left in place had 12,000 ppm TPH. |
Former Staff |
| 7/19/1991 |
Leaking Underground Storage Tank Corrective Action Underway |
RAPR; DOWL engineers sent copy of soils disposal plan to DEC. Plan approved by Scott Bailey Anchorage District Office DEC 9/20/91 for soils to be disposed of at Municipal landfill. |
Former Staff |
| 10/28/1991 |
Update or Other Action |
REM; U.S.D.I. M. Michael Davis regional director sent letter, spill/release investigation report & load tickets from the municipality regional landfill for proof of disposal of the contaminated soil stockpile generated from the UST closure. DOWL Sep.'91 report showed groundwater samples (3) with benzene levels above MCL of 5 ppb (13,000, 28, 4,530 ppb) & toluene/xylenes were in excess of adopted MCLs. VPH levels in soil sample S-2 exceeds target cleanup levels (111 ppm) |
Former Staff |
| 3/20/2000 |
Leaking Underground Storage Tank Corrective Action Underway |
In a letter dated 20 Mar 00, a CAP for excavation was approved with several conditions. |
Former Staff |
| 3/20/2001 |
Update or Other Action |
Field work completed last summer, report not yet submitted. |
Lynne Bush |
| 4/2/2001 |
Update or Other Action |
Harris agreed to send report, ASR receipts, and other pertinent data. |
Lynne Bush |
| 4/16/2001 |
Update or Other Action |
mitch johnson brought some of the required data by, more to follow. |
Lynne Bush |
| 4/24/2001 |
Update or Other Action |
updating file. |
Lynne Bush |
| 12/19/2001 |
Update or Other Action |
Site transferred Bush -> Weimer. |
Lynne Bush |
| 3/7/2003 |
Update or Other Action |
Site transferred to Lynne Bush: No change since previous transfer in 2001. |
Robert Weimer |
| 3/24/2003 |
Update or Other Action |
Quick review of database file to familiarize myself with changes in site since 2001. No changes reported. No actions taken in interim. |
Lynne Bush |
| 6/16/2004 |
Update or Other Action |
ADEC project manager transfer from Blessing to Jaynes; File sent to Juneau office. |
Sarah Cunningham |
| 9/28/2004 |
Update or Other Action |
Discussed site with Carol Peterson of U.S. Department of Interior and Matt Thomas of Alaska Department of Public Safety. Faxed Departmental memo's to Matt and requested release investigation report from Carol Peterson. |
Todd Blessing |
| 4/26/2005 |
Update or Other Action |
Department has determined that Mike Jaynes will manage floor drain while Todd Blessing will manage LUST portion of this site. |
Todd Blessing |
| 4/26/2005 |
Update or Other Action |
The Department requests that DOI Office of Aircraft Services submit a work plan to the Department that describes the means and methods to do the following:
• Evaluate the present extent of groundwater contamination by sampling groundwater in all on-site monitor wells to test for GRO, DRO, and VOC’s by methods AK101, AK102, and SW8260; respectively;
• Sample groundwater in monitor well VX3-W1 to test for ethylene dibromide, and 1,2, dichloroethane by EPA methods 504 or 8011;
• Evaluate the potential for occupants of the Office of Aircraft Services to be adversely impacted by the inhalation of VOC’s; and
• Evaluate the potential for contaminants of concern in groundwater to migrate into Lake Hood adversely impacting surface water quality standards defined in 18 AAC 70. |
Todd Blessing |
| 9/15/2005 |
Update or Other Action |
Was informed that U.S. Fish and Wildlife wishes to evaluate the floor drain and remove a 500 gallon heating oil tank in October of this year. |
Todd Blessing |
| 10/13/2005 |
Update or Other Action |
Conditionally approved work plan for site investigation within the Aviation Management Directorate (AMD) Hangar. Within the Work Plan, GeoEngineers Inc. proposes to cut up to six sets of duplicate, side-by-side, 3-inch diameter holes in the concrete floor of the AMD hangar. One set of test holes will be used to collect field analytical data, while the second set of test holes will be advanced to collect soil samples to be analyzed by a Department approved laboratory for GRO, BTEX, VOCs, DRO, and RRO. In one test hole a Geoprobe micro-screen will be installed in order to collect groundwater samples to be analyzed for contaminants of concern. GeoEngineers Inc. also proposes to remove a 500 gallon heating oil tank in accordance with Department approved procedures for underground storage tanks.
At this time, the Department approves of the Work Plan as written under the condition that if investigative derived waste is generated during the investigation of contaminants in soil and/or groundwater underneath the AMD Hangar, GeoEngineers Inc. will consult with the Department prior to its disposal. |
Todd Blessing |
| 11/7/2006 |
Update or Other Action |
Issued letter to Charles Grant of Fish and Wildlife Service requesting report for October 2005 site investigation. |
Todd Blessing |
| 3/5/2007 |
Exposure Tracking Model Ranking |
Initial ranking |
Todd Blessing |
| 3/19/2007 |
Update or Other Action |
Issued letter to Charles Grant of USFWS requesting investigation to determine groundwater and surface water impacts from past fuel spills. |
Todd Blessing |
| 7/3/2007 |
Institutional Control Record Established |
In accordance with 18 AAC 75.350, ADEC has
determined that the unconfined groundwater (above the Bootlegger Cove Formation)
at the Anchorage International Airport (AIA) is not a current or future drinking
water source. This determination is subject to the following conditions:
1. It applies only within the Airside and Commercial RMZ’s, as described in the
Airport-Wide Remediation Management Plan. It does not apply within the Ecological RMZ.
2. It does not establish alternative cleanup levels within those zones but allows
ADEC to use the determination in making decisions in accordance with
18 AAC 75.345(b)(2) - (3). 3. Any drinking water wells located on AIA property must
be properly abandoned in accordance with ADEC decommissioning procedures within two
years of this decision. 4. AIA shall prohibit the installation of any water wells,
used for drinking, cooling, washdown, or any other purposes, on the AIA either
through 17 AAC 42.410 (b) (27) of the airport leasing regulations or in their
individual lease agreement documents. 5. The existing AIA water well used
to maintain the water level in Lake Hood is not considered a drinking water well. However, AIA is responsible for determining its wellhead protection area and ensuring that it maintains levels at or below 18 AAC 75.345 Table C values, unless otherwise approved by ADEC. March 19, 2007 Amendment: DEC has determined that the shallow groundwater along the Lake Hood shoreline is not a current or future drinking water source in accordance with 18 AAC 75.350. Therefore, the March 2001 groundwater use determination is amended to include the shallow groundwater in the Ecological RMZ in that determination. |
Colleen Deal |
| 2/15/2008 |
Update or Other Action |
DEC reviewed and approved a work plan titled “Remedial Excavation, OAS Hangar, Anchorage, Alaska.” This work plan was prepared by GeoEngineers, dated January 09, 2008, and received at DEC’s Anchorage Office on January 17, 2008. The work plan was prepared on behalf of HDR Alaska (primary consultant to U.S. Fish and Wildlife) as part of the Under-Slab Soil Remediation and Heating Replacement Design. GeoEngineers plans on excavating and disposing of contaminated soil encountered beneath a concrete slab in the vicinity of a French drain.
Within the work plan, GeoEngineers proposes to do the following: Prepare an Environmental Site Health and Safety Plan; document details of all former floor drain piping during concrete slab demolition; segregate and classify potentially contaminated soil; evaluate the levels of contaminants of concern in stockpiled soil and at the base of excavation pits; transport contaminated soil in containerized “supersacks” to an ADEC approved treatment facility; and backfill excavation pits with clean soil that meets structural design requirements identified by HDR. GeoEngineers also proposed to excavate and treat contaminated soil discovered near a former aviation gas underground storage tank (Tank #1) as project timelines and budgets permit. |
Todd Blessing |
| 6/11/2008 |
Update or Other Action |
DEC approved of a request by GeoEngineers to transport and treat 100 cubic yards of contaminated soil at Columbia Ridge Landfill. The soils was contaminated with halogenated volatile organic compounds. |
Todd Blessing |
| 11/4/2008 |
Update or Other Action |
DEC staff recently reviewed GeoEngineer’s Excavation Report, which was received at DEC’s Anchorage Office on October 13, 2008. GeoEngineers documented the segregation and treatment of contaminated soil associated with the former floor drain of the OAS Hangar. Contaminated soil was uncovered during the removal of the Hangar floor slab that measured approximately 72 feet by 89 feet. The soil encountered consisted of brown slightly silty sand to a depth of 6 to 8 feet below ground surface (bgs). Dark grey, water saturated sandy silt was encountered from depths of 8 to 10.5 feet bgs. During removal of the floor drain a concrete sump measuring 2 feet deep and 2.5 feet wide was removed; two pipes leading to the sump from the east and the west were severed. The floor drain was not believed to be connected to AWWU sewer lines.
During soil excavation, GeoEngineers’ personnel field screened soil to estimate the extent of contamination. A total of 42 soil samples were tested using a photoionizing detector (PID). Vapor concentrations were low throughout the exposed soil; however, the headspace readings were consistently higher for the western portion of the excavation area. Twelve soil grab samples were collected from the excavation floors and sidewalls, three composite soil samples from stockpiles, disposal characterization samples and seven composite overburden soil samples were collected. In every soil sample collected, the levels of tetrachloroethylene (TCE) exceeded the 18 AAC 75.341 Table B1 value of 0.024 mg/kg. GeoEngineers reported that 100 cubic yards of TCE-contaminated soil was disposed at Columbia Ridge Landfill and 30 to 40 cubic yards of TCE contaminated soil was returned to the excavation pit along with clean fill.
DEC issued a letter to John Harris on November 4, 2008 requesting that he facilitate the submital of a site investigative work plan to DEC by March 31, 2009. This work plan will need to define the means and methods to determine the extent of dissolved phase contamination.
|
Todd Blessing |
| 1/30/2009 |
Update or Other Action |
DEC staff reviewed a work plan prepared by Oasis Environmental which was received at on January 28, 2009. The work plan was prepared on behalf of HDR Alaska (primary consultant to U.S. Fish and Wildlife) to conduct site characterization activities.
In accordance with the subject work plan, Oasis Environmental proposes to do the following:
1. Prepare an Environmental Site Health and Safety Plan.
2. Subcontract with GeoTek Alaska, Inc. to install two, 2-inch diameter direct push wells north of the Old OAS Hangar along the Lake Hood Shoreline.
3. Place passive diffusion bags (PDB) in each well tethered 2.5 feet from the bottom of each well.
4. Allow the PDB’s to equilibrate for a minimum of four weeks and then retrieve each to be sampled and analyzed for volatile organic compounds my an ADEC approved method.
5. Provide a summary report of site characterization activities.
DEC issued a letter on January 30, 2009 approving of the subject work plan.
|
Todd Blessing |
| 7/29/2009 |
Site Characterization Report Approved |
DEC staff reviewed HDR's "Groundwater Assessment Report, Old OAS Hangar", dated June 26, 2009. This report documented the installation of two groundwater montoring wells (MW-1 and MW-2) north of the Old OAS Hangar. Passive diffusion bags (PDB's) were deployed in each new well and allowed to equilibrate for four weeks. The PDB's were then retrieved and then submitted to Test America Inc. to be analyzed for volatile organic compounds. DEC evaluated the analytical data and laboratory data review checklists and determine it is acceptable for decision making purposes. Benzene was the only compound detected at levels that exceeded cleanup values. Benzene was detected in monitoring wells MW-1 and MW-2 at levels of 3.6 and 0.012 mg/L; respectively. DEC staff met with representatives of HDR, Oasis Enviromental (sub-contractor), and United States Fish and Game on July 28, 2009 to discuss the results. DEC recommend long term monitoring of groundwater, deployment of passive diffusion bags in sediment along Lake Hood, and advancement of two additional borings near the location of an old dispenser for future work. |
Todd Blessing |
| 9/25/2009 |
Site Characterization Workplan Approved |
DEC staff reviewed and approved Oasis Environmental Inc.'s “Old Hangar Additional Site Investigation”, dated September 24, 2009. Within the work plan, Oasis’ proposed to evaluate subsurface soil conditions at the former fuel dispenser island and evaluate surface water impacts in the surface water/sediment interface near monitoring wells MW-1 and MW-2. A soil boring will be drilled at the location of the former fuel dispenser southwest of the Hangar building. Two soil samples will be collected from this boring. In addition, Oasis will deploy passive diffusion bag (PDB) samplers in the surface water/sediment interface. After four weeks the PDB’s will be retrieved and analyzed for BTEX and PAH’s. |
Todd Blessing |
| 2/23/2010 |
Update or Other Action |
DEC staff met with Charles Grant of USFS, Nino Munex of Oasis Environmental, and Lori Gastrock of HDR to discuss Oasis' "Soil and Surface Water Assessment Report, Old OAS Hangar Anchorage, Alaska", dated February 2010. Pore water sample results from near the former fuel dispenser were non detect for BTEX compounds. In addition, the soil boring advanced near the former dispenser exhibited levels of tolune and GRO above 18 AAC 75.341 Table B1 and B2 values. DEC staff suggested that USFS should generate a long term monitoring plan to document that groundwater contaminant concentrations are stable or decreasing. |
Todd Blessing |
| 11/19/2014 |
Update or Other Action |
Staff completed review of the file and noted data gaps that need to be addressed. |
Debra Caillouet |
| 12/11/2014 |
Update or Other Action |
A request for additional site characterization was sent to FWS. |
Debra Caillouet |
| 11/24/2015 |
Update or Other Action |
Letter sent to Responsible Party documenting site characterization data gaps. Letter requested a round of groundwater monitoring be completed, and a workplan for additional site characterization be submitted to ADEC by 4/30/2016. |
Kara Kusche |
| 10/9/2018 |
Workplan Requested |
Letter sent to Responsible Party documenting site characterization data gaps. The letter requested communication by December 31, 2018 and work plan by April 30, 2019 to complete site characterization and a round of groundwater monitoring. |
Wendy Hansen |
| 10/16/2019 |
Meeting or Teleconference Held |
Staff had discussion with USFWS representative. USFWS is currently planning to perform further site characterization consistent with DEC letter dated October 9, 2018. There is a potential the hanger currently on site will be removed, such that evaluation of the vapor intrusion pathway would not be warranted. Submittal of a contractor statement of work for DEC input is anticipated late in 2019. |
Wendy Hansen |
| 2/22/2021 |
Document, Report, or Work plan Review - other |
OAS Lake Hood Hangar Work Plan reviewed and commented on. Approval letter sent 2/22/2021. Work plan details soil and groundwater sampling to be conducted after demolition of the hangar, located on Lake Hood. 4 areas of contamination are present and soil removal is planned, amount to be removed will hinge on the results of field screening results. |
Kelly Walker |
| 8/10/2021 |
Document, Report, or Work plan Review - other |
Draft Environmental Assessment sent to DEC for comment. The work started in the Spring 2021 WP was halted after building demolition in April 2021. The existing contamination was greater than expected and the new building on the old hangar footprint would obstruct visual communication for the flight tower. Proposing to move new building to a different location on the same site.
8/19/2021: Email sent to USFWS from program manager with our comments on EA. |
Shonda Oderkirk |
| 1/26/2022 |
Document, Report, or Work plan Review - other |
Received Draft RA Report. 2/8/2022 Comments sent. 3/8/2022 RTC received. Final approval sent 3/9/2022. |
Shonda Oderkirk |
