| Action Date |
Action |
Description |
DEC Staff |
| 8/19/1988 |
Site Added to Database |
|
Former Staff |
| 8/19/1988 |
Leaking Underground Storage Tank Corrective Action Underway |
RAPR; Hart Crowser soil gas survey proposal. Verbal ADEC approval. |
Former Staff |
| 8/19/1988 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST Site created in CSP for source area ID 77789 ADD; Petroleum contaminant. |
Former Staff |
| 8/20/1988 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
LCAU; :LCAU Date changed DB conversion |
Former Staff |
| 8/25/1988 |
Release Investigation |
SI; Hart Crowser soil gas survey. Survey indicates free phase product migrated southward from site. Free phase migration estimated on the order of 50 feet south of site. |
Former Staff |
| 9/29/1988 |
Leaking Underground Storage Tank Corrective Action Underway |
RAPR; Hart Crowser site assessment. Water well survey within 1/2 mile radius. Installation of 3 borings/monitoring wells. Install 2 well points. Install 1 recovery well. Verbal ADEC approval. |
Former Staff |
| 10/3/1988 |
Release Investigation |
SI; Water well survey within 1/2 mile. 25 well sites were identified in the records search. 1 was shown to be in use. |
Former Staff |
| 10/3/1988 |
Release Investigation |
SI; Hart Crowser site assessment report. Floating product in MW-3, MW-9 and RW-1. Soil boring samples indicate elevated TPH primarily at the groundwater table. Groundwater samples from all monitoring wells had detectable dissolved BTEX. The greatest BTEX occurred in groundwater samples MW-1, MW-2, MW-3 and RW-1 taken on 10/6 and 10/7/88. Vapor extraction tests did not show this type of remediation to be economically viable. Groundwater typically occurs at 10 feet in the site monitoring wells. Groundwater flows generally towards the south. |
Former Staff |
| 12/9/1988 |
Leaking Underground Storage Tank Corrective Action Underway |
RAPR; Hart Crowser recommendations for remedial actions. A single or duel phase recovery system may be used based on field testing of monitoring well RW-1. An oil/water separator combined with a water treatment system to treat groundwater. Initial product recovery using a product skimming pump. |
Former Staff |
| 1/11/1989 |
Site Visit |
FI; Hunter Environmental Services tests fuel storage tanks and lines. |
Former Staff |
| 8/17/1989 |
Leaking Underground Storage Tank Corrective Action Underway |
RAPR; Hart Crowser work plan for free product recovery system. Free product will be recovered from monitoring well RW-1. A cone of depression will be induced and a dual phase recovery system will be used. Anticipated to be in place by 9/1/89. Verbal ADEC approval 8/28/89. Additional information submitted 9/28/89. Written ADEC approval 9/28/89. Air stripping water treatment. |
Former Staff |
| 8/22/1989 |
Update or Other Action |
PER; Anchorage Water & Wastewater discharge permit for treated groundwater from free product recovery system. Permit expires 10/1/91. |
Former Staff |
| 9/18/1989 |
Update or Other Action |
PER; Anchorage Water & Wastewater sewer connect permit. |
Former Staff |
| 10/11/1989 |
Update or Other Action |
PER; ADEC approves the operation of an infiltration gallery on-site for disposal of treated groundwater. Final approval requires submittal of engineered as-built plans. Permit #8921-DB015. Final approval 1/22/90. Permit expires 1/1/92. |
Former Staff |
| 7/31/1990 |
Update or Other Action |
REM; Disposal application for 280 cubic yards of contaminated soils at Anchorage Sand & Gravel. Soils were excavated during installation of site remediation facilities. Verbal approval by ADEC on 9/28/90. |
Former Staff |
| 8/6/1990 |
Release Investigation |
SI; Hart Crowser floating product recovery system performance monitoring. Product recovery system shut down on 9/16/90 due to iron oxides plugging the recharge gallery. As of 11/2/90 a total of 360 gallons of product were recovered. Since 9/16/90 the product skimming pump has been operated. This does not operate under induced cone of depression. Client willing to discharge to AWWU sewer system. |
Former Staff |
| 12/13/1990 |
Update or Other Action |
F; Letter sent requesting estimated time frame for bringing groundwater pump and treatment system back on line. Requested the status of soil treatment/disposal plan which was approved on 10/2/90. |
Former Staff |
| 5/28/1991 |
Update or Other Action |
REM; Approval granted for workplan sent to permanently close six 20,00 gallon underground storage tanks. Notification is needed 3 days prior to initiating field work for DEC staff to inspect site during tank removal. |
Former Staff |
| 7/1/1991 |
Update or Other Action |
F; Hart Crowser sent in July monitoring report to DEC. As of July 17, 1991, a total of approximately 1,403 gallons of floating product has been recovered. From 3/26/91 to 7/17/91 the average product recovery rate was 9.0 gal/day. Effluent samples were all below compliance limit for aromatic hydrocarbons as BTEX & 10 mg/L for total hydrocarbons(oil & grase). Influent samples showed benzene removal efficiency to be greater than 99%. |
Former Staff |
| 9/5/1991 |
Update or Other Action |
F; Butler Aviation sent in results from lab analysis of samples taken at site. Treated water discharged into the sanitary sewer is meeting the limitations for Total hydrocarbons 10 mg/l & BTEX .1 mg/l. Product recovery system was shut down on 8/26/91 to facilitate removal of 6 20,000 gallon underground storage tanks at Plant #4 facility. |
Former Staff |
| 7/21/1992 |
Leaking Underground Storage Tank Corrective Action Underway |
LCAR; Corrective Action report reviewed for Pilot Vacuum Test. Okay given by DEC to continue. |
Former Staff |
| 7/21/1992 |
Leaking Underground Storage Tank Corrective Action Underway |
LCAR; Corrective action report reviewed for Pilot Vacuum Test. Okay given by DEC to continue. |
Former Staff |
| 7/21/1992 |
Leaking Underground Storage Tank Corrective Action Underway |
LCAR; Corrective Action report reviewed for Pilot Vacuum Test. Okay given by DEC to continue. |
Former Staff |
| 7/24/1992 |
Leaking Underground Storage Tank Corrective Action Underway |
CAPR; Letter sent approving proposal for in-situ bioremediation of petroleum contaminated soils at Anchorage Fueling Service Company Plant #4, at 344 @. Internation Airport Rd. A general wastewater permit is also required. |
Former Staff |
| 12/11/1992 |
Long Term Monitoring Established |
MS; Bioremediation created potential high nitrate levels which may create a "nitrate slug" moving through the groundwater. Letter issued by Keven Kleweno due to water quality concerns. |
Former Staff |
| 4/10/1993 |
Update or Other Action |
MS; Monitoring report reviewed. Air stripper sample should be taken at hightest GW concentration of benzene. |
Former Staff |
| 8/18/1995 |
Leaking Underground Storage Tank Corrective Action Underway |
LCAR; Reviewed a quarterly and VES report. |
Former Staff |
| 9/27/1995 |
Update or Other Action |
CAPR; Reviewed file and CAP report. |
Former Staff |
| 11/20/1997 |
Update or Other Action |
ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: SIGNATURE FLT. SUPPORT - AFSC, I |
Former Staff |
| 2/8/2000 |
Update or Other Action |
Memorandum to File; LBush |
Daniel Rogers |
| 8/8/2000 |
Underground Storage Tank Site Characterization or Assessment |
Interim Report soil and Groundwater Investigation AFSC Plant No.4 |
Daniel Rogers |
| 1/24/2001 |
Update or Other Action |
Rec'd draft of RI plan |
Lynne Bush |
| 2/15/2001 |
Update or Other Action |
Sent e-mail to RP with suggestions to improve the release investigation/historical summary. |
Lynne Bush |
| 10/16/2001 |
Update or Other Action |
Letter to SFS requesting WP to characterize the site, etc. |
Lynne Bush |
| 12/17/2001 |
Update or Other Action |
Extended date for WP to Feb 28, 2002. Plan to meet with L Butler to discuss plans for site in January 2002. |
Lynne Bush |
| 12/18/2001 |
Update or Other Action |
Site management transferred from Bush to Evans. |
Lynne Bush |
| 10/8/2002 |
Update or Other Action |
This site has been incorporated into the AIA Risk Assessment project. |
Lynne Bush |
| 11/3/2003 |
Update or Other Action |
ADEC Project Manager transferred from Evans to Blessing |
Todd Blessing |
| 9/30/2004 |
Update or Other Action |
Reviewed 2004 annual groundwater monitoring report. No measurable free product in monitoring wells observed. The levels of GRO and/or benzene in 13 of the 16 wells sampled exceeded 18 AAC 75.345 Table C cleanup levels. The levels of GRO, DRO and BTEX in MW5, the northernmost monitoring well, were non detect. |
Todd Blessing |
| 2/2/2005 |
Update or Other Action |
Submitted letter to ASIG requesting they submit a Long Term Groundwater Characterization and Free Product Recovery Work Plan to the Department. The Work Plan should include a discussion of the means and methods to do the following:
• Characterize the local groundwater flow direction and gradient;
• Install a groundwater monitoring well to the west of the AFSC Plant No. 4 in the Northern Air Cargo parking lot to assess plume migration to the west;
• Install a groundwater monitoring well northwest of MW3 to evaluate plume migration to the northwest of the site;
• Install a groundwater monitoring wells northeast and east of MW-7 to evaluate plume migration to the northeast and east of the site;
• Annually monitor groundwater contaminant concentrations and free product thickness over an extended period of time; and
• Recover free product if applicable. |
Todd Blessing |
| 7/6/2005 |
Update or Other Action |
Approved of Work Plan to conduct a site assessment. Within the work plan, URS Inc. proposes to sample groundwater from eleven monitoring wells and seven well points from the surrounding area to be analyzed for GRO, DRO, and BTEX. During the sampling event, groundwater elevations will also be evaluated in order to determine the present groundwater flow direction. Wells with free product will not be sampled, but evaluated for thickness of free product in the well. Investigative derived waste will be treated at AFSC’s treatment facility. At this time, the Department approves of the Work Plan as written. |
Todd Blessing |
| 10/31/2005 |
Document, Report, or Work plan Review - other |
Reviewed Plant No. 4 Groundwater Monitoring Report. Groundwater was collected from 15 wells and analyzed for GRO, DRO, and BTEX. The levels of GRO, DRO, and benzene measured in groundwater collected from the majority of the wells exceeded 18 ACC 75.345 Table C values. Free product was discovered in monitor wells MW-3 and WP-13. Groundwater elevations suggested that in June of this year, groundwater was flowing north towards Lake Hood. |
Todd Blessing |
| 11/3/2005 |
Underground Storage Tank Site Characterization or Assessment |
The Department recently reviewed the site assessment report for Former Plant No. 4, which was received by the Department on October 4, 2005. The site assessment report documented the June sampling and analysis of groundwater for petroleum constituents at the former Plant No. 4 and Federal Express facility. Groundwater elevations were evaluated from a majority of the monitor wells in order to determined the present groundwater flow direction. The following can be concluded following a review of the site assessment report:
• Groundwater elevation data at the time of sampling suggests that groundwater is generally flowing north;
• Free phase product is present in two monitor wells (MW-3 and WP-12);
• The levels of dissolved phase petroleum constituents (i.e. GRO, DRO, and benzene) exceed 18 AAC 75.345 Table C values over most of former Plant No. 4 area ; and
• The extent of groundwater contamination has yet to be defined.
At this time, the Department requests that ASIG’s submit a memo to the Department that discusses the disposal of investigative derived waste following the June 2005 groundwater monitoring event. In July 2005, the Department approved of the disposal of purge water at AFSC’s treatment facility. The site assessment report does not appear to discuss how much purge water was generated and when and if it was treated. |
Todd Blessing |
| 6/23/2006 |
Update or Other Action |
Recieved site investigation work plan. Within the work plan, BGES proposes to advance up to six soil borings with three completed as monitor wells. During the advancement of the soil borings, soil samples will be collected continuously and field screened with a photo ionizing detector. The split spoon boring exhibiting the greatest concentration of petroleum constituents will be re-sampled for laboratory analysis. Soil samples will be analyzed for GRO, DRO, and BTEX. Following the monitor well installation, groundwater samples will be collected from all on-site monitor wells except WP-1, WP-2, WP-5, and possibly WP-9. Investigative derived soil cuttings will be disposed of by Emerald Alaska Inc.. Waste water will be disposed of by ASIG.
At this time, the Department approves of the work plan as proposed by BGES under the following conditions:
•Groundwater and soil samples will be collected in triplicate from one sample location during the site investigation. The replicate groundwater samples will be submitted to the analytical laboratory “blind”; and
•Soil cuttings generated during the site investigation will be treated at Alaska Soil Recycling, Inc. (per verbal agreement on June 16, 2006) since Emerald Alaska Inc. is not presently approved by the Department to treat contaminated soil. In addition, soil cuttings generated from this investigation will not be commingled with a soil or material contaminated with a source other than jet fuel. Post treatment soil samples will be analyzed for GRO/DRO and BTEX. |
Todd Blessing |
| 7/11/2006 |
Update or Other Action |
Submitted letter to ASIG approving of their request to decommission 5 recovery wells. The wells will be decommissioned by filling the well casing and bore hole with a bentonite slurry. The top 5 feet of the well bore hole will be filled with clean structural material. The well vaults will be filled with clean structural material as well and the pavement will be patched. |
Todd Blessing |
| 1/2/2007 |
Update or Other Action |
Issued letter to Amber Deem requesting long term monitoring work plan. |
Todd Blessing |
| 3/30/2007 |
Exposure Tracking Model Ranking |
Initial ranking |
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 |
| 2/27/2008 |
Update or Other Action |
DEC staff reviewed a well installation and groundwater monitoring report that was dated December 2007 and was prepared by URS. URS collected groundwater samples from nineteen wells located at the subject site to be analyzed for GRO, DRO, RRO, and BTEX. Free product was discovered in monitor wells MW-3 and WP-12. In collected samples, the levels of DRO ranged from nondetect to 10.8 mg/L.; GRO ranged from nondetect to 9.04 mg/L; and benzene ranged from nondetect to 0.735 mg/L. RRO, ethylbenzene, toluene, and total xylenes were not detected at levels that exceed 18 AAC 75.345 Table C values. URS evaluated groundwater elevations in 15 groundwater monitor wells and groundwater, in general, was determined to flow northeast. DEC issued a letter to ASIG requesting that they facilitate the submittal of a long term monitoring plan to DEC by May 30, 2008. |
Todd Blessing |
| 7/9/2008 |
Conditional Closure Approved |
The AFSC Plant No. 4 site was impacted from past releases of waste oil and jet fuel but cleanup efforts have removed the majority of sources (USTs, free phase productl, and contaminated soil). Even though residual soil and groundwater contamination remains above the most stringent DEC cleanup levels, it does not pose an unacceptable risk to human health or the environment provided site specific conditions established below are complied with. Based on this information, ADEC approves conditional closure status for this site subject to the following conditions:
1. The owners/operators of the property shall notify DEC in the event soil or groundwater is proposed for transport or discharge off site. DEC approval of any off site transport is required in accordance with 18 AAC 78.274(b);
2. The owners/operators of the site shall conduct periodic groundwater monitoring in accordance with a monitor plan approved by DEC to ensure a stable and decreasing trend in contaminant concentrations;
3. No groundwater wells may be installed without prior review and approval by DEC;
4. A Notice of Environmental Contamination shall be listed on the DEC database to document that there is hazardous substance contamination remaining above the most stringent DEC cleanup levels; and
5. ADOT&PF will document the environmental status of this property in all future lease documents (including any site specific conditions) until established DEC cleanup levels are achieved. |
Todd Blessing |
| 8/29/2008 |
Update or Other Action |
DEC staff have reviewed and approved a long term groundwater plan. This plan was prepared by URS and received at DEC’s Anchorage Office on August 01, 2008. URS proposes to annually collected groundwater samples from 10 existing monitor wells to be analyzed for contaminants of concern (COCs). URS will also evaluate groundwater flow direction and the natural attenuation of dissolved fuel constituents over the long term. Groundwater samples will be collected until the levels of COCs meet DEC cleanup criteria. |
Todd Blessing |
| 2/24/2009 |
Update or Other Action |
DEC staff reviewed URS "Final Report Groundwater Monitoring, Former Plant 4 Facility, Anchorage International Airport, Aircraft Service International Group", dated December 2008. In this report, URS personnel documented the sampling of 10 existing monitoring wells to be analyzed for GRO, DRO, and BTEX. DRO concentrations ranged from 1.16 to 6.81 mg/L; GRO concentrations ranged from 0.062 to 7.7 mg/L; and benzene concentrations ranged from 0.00343 to 6.81 mg/L. Tolune, ethylbenzene, and total xylenes were not detected above DEC cleanup values. The groundwater contaminant plume boundaries are unchanged from the 2007 groundwater monitoring event. Groundwater elevations suggest groundwater is flowing north. |
Todd Blessing |
| 12/15/2009 |
Document, Report, or Work plan Review - other |
DEC staff reviewed and commented in a December 14th letter on URS'“Final Report Groundwater Monitoring Former Plant 4 Facility Anchorage International Airport“ Dated December 2009. URS evaluated the levels of free product, contaminants of concern, and groundwater elevations in ten monitoring wells located at AFSC’s Former Plant 4 facility. Free product was present in MW-3, WP-11, and WP-12 and it ranged from 0.29 to 1.16 feet in thickness. In 7 of the 10 monitoring wells sampled, the levels of GRO and/or benzene exceeded 18 AAC 75.345 Table C values; however the groundwater contaminant plume has not migrated offsite. Groundwater elevation data indicated that groundwater flows north. DEC staff requested that historical free product measurements and groundwater analytical data be included in all future monitoring reports. |
Todd Blessing |
| 11/8/2010 |
Update or Other Action |
DEC staff reviewed URS' "Final Report Groundwater Monitoring Former Plant 4 Facility Anchorage International Airport Anchorage Fueling and Service Company", dated November 2010. In this report, URS documented the sampling and analysis of groundwater from 10 on-site wells to be analyzed for GRO, DRO, RRO, and BTEX. The levels of GRO ranged from 0.158 to 6.77 mg/L; the levels of RO ranged from 0.52 to 10.1 mg/L; and benzene concentrations ranged from 0.0019 to 0.931 mg/L. No other analytes exceeded ADEC cleanup criteria. |
Todd Blessing |
| 2/15/2011 |
Meeting or Teleconference Held |
DEC staff met with Amber Deem to discuss site status. Amber informed DEC that the building on-site was demolished. She recommended installing new wells onsite and will issue a work plan for the new wells this year. |
Todd Blessing |
| 6/27/2011 |
Update or Other Action |
DEC staff reviewed and approved of BGES, Inc.'s "Work Plan for Limited Phase II Environmental Site Assessment, 3444 West International Airport Road, Lots 9 and 10, Anchorage, Alaska." This work plan provides the framework for conducting a limited Phase II site investigation at the site. The work plan activities are part of Guardian Flights efforts evaluating the present levels of contaminants in concern in soil within the footprint of a proposed Guardian Flight building. BGES proposed to advance 8 soil borings at the site up to 40 feet below ground surface. Soil samples that exhibit the greatest field screen reading, will be analyzed for GRO, DRO, and BTEX by DEC approved methods. |
Todd Blessing |
| 6/27/2011 |
Update or Other Action |
DEC staff reviewed and approved of BGES, Inc.'s "Work Plan for Limited Phase II Environmental Site Assessment, 3444 West International Airport Road, Lots 9 and 10, Anchorage, Alaska." This work plan provides the framework for conducting a limited Phase II site investigation at the site. The work plan activities are part of Guardian Flights efforts evaluating the present levels of contaminants in concern in soil within the footprint of a proposed Guardian Flight building. BGES proposed to advance 8 soil borings at the site up to 40 feet below ground surface. Soil samples that exhibit the greatest field screen reading, will be analyzed for GRO, DRO, and BTEX by DEC approved methods. |
Todd Blessing |
| 6/28/2011 |
Site Visit |
Visit to site to evaluate phase II site investigation in progress. |
Todd Blessing |
| 8/16/2011 |
Site Characterization Report Approved |
Staff reviewed BGES, Inc.'s Limited Phase II Environmental Site Assessment, dated July 2011. The report documented BGES evaluation of the current levels of soil contamination on-site as part of Guardian Flight's due dillegence prior to constructing an on-site Hangar. BGES advanced six soil borings that encompassed both the former Plant No. 4 facility and the Federal Express facility. The soil samples will be analyzed for GRO, DRO, RRO, metals, polynuclear aromatic hydrocarbons, and volatile organic compounds. In these samples GRO, DRO, benzene, ethylbenezene, chromium, 1,2-dichloropropane, n-propylbenzene, 1,2,5 - trimethylbenzene, n-Butylbenene, Napthalene, 1-Methylnapthalene, 2-Methylnapthalene, and chromium exceed DEC cleanup criteria. Based on a reveiw of this report and the boring logs that suggested volatile organic compound presence five feet below grade, staff requested that a vapor intrusion investigation be conducted prior to the construction of the Hangar. |
Todd Blessing |
| 11/1/2011 |
Update or Other Action |
DEC reviewed and approved of URS "Forensic Sampling and Vapor Monitoring AFSC Former Plant 4 Facility/Kilo Gates Hydrant System", dated October 27, 2011. URS proposed to sample soil gas and groundwater near the footprint of the proposed Guardian Flight building. This phase was designed to identify areas of interest with elevated soil gas levels and to identify what fuel type, if any, has impacted groundwater. |
Todd Blessing |
| 11/14/2011 |
Update or Other Action |
URS Corporation discussed the status of the Phase I baseline study. URS could not bore into frozen ground and therefore, is requesting a modification to the November 2011 work plan. |
Todd Blessing |
| 11/14/2011 |
Update or Other Action |
Staff approved of URS request to amend the October 27, 2011 wrok plan. URS could not bore into frozen ground and therefore, a modification to the approved plan was needed. URS will conduct vapor screening utilizing ultraviolate optical screening tool (UVOST). Soil samples will also be collected based on UVOST results and analyzed for DRO, GRO/BTEX. |
Todd Blessing |
| 2/8/2012 |
Update or Other Action |
DEC staff reviewed URS "Final Report Groundwater Monitoring Former Plant 4 Facility Anchorage International Airport, Anchorage Fueling and Service Company". The report documented the completion of a site-wide groundwater level survey and groundwater sampling event. Groundwater samples were collected from 10 existing wells (MW-2, MW-5, MW-6, MW-9, MW-10, MW-11, MW-12, WP-6, WP-8, WP-13). Free product was noted in wells WP-1, WP-11, and WP-12 and therefore thesee wells were not sampled. In the followiing wells sampled contaminants of concern exceeded 18 AAC 75.345 Table C levels: MW-2, MW-6, MW-9, MW-10, WP-6, and WP-8. Groundwater elevations suggested groundwater was flowing northwest. |
Todd Blessing |
| 6/8/2012 |
Update or Other Action |
DEC approved of a work plan preparred by URS to decommission the 17 on-site groundwater monitoring wells to clear space for the construction of Guardian Flight's building. Wells MW-1 through MW-4, MW-6, MW-7, MW-9, WP-1, and WP-6 through 13 will be decommissioned in accordance with DEC guidance. |
Todd Blessing |
| 6/19/2012 |
Update or Other Action |
Staff reviewed and conditionally approved of Cold Country Design's foundation plan for the building proposed to be constructed on-site. The foundation is proposed to be installed with perforated piping vent lines underneath the slab that is underlain by a VOC barrier membrane. This system is designed to passively vent any vapors underneath the slab and potentially inhibit any vapors from being advectively transported through cracks in the foundation slab. The plan was approved with the following conditions:
• The vapor barrier installed will have a minimum thickness of 6 mil and cover the entire floor area. Separate sections of liner should be overlapped by at least 13 inches. The liner should fit closely around any pipe, wire or other penetrations. Punctures or tears in the material shall be repaired.
• Following installation of the vapor mitigation system and foundation, CCAD shall collect indoor air samples per every 10,000 square feet of floor space to be analyzed for VOC’s by EPA’s TO-15 method. We request that a brief work plan of the this sampling event be submitted to CSP for review and approval
|
Todd Blessing |
| 7/9/2012 |
Update or Other Action |
DEC staff reviewed and approved of porposed modifications to the vapor mitigation system at the Guardian Flight Ops Center. These modifications were requested by Cold Country Alaskan Design in a letter recieved at DEC on June 2, 2012. The installed vapor barrier will be located above the vapor ventilation system. The vapor barrier will be 20 mil and is designed to specifically resist vapor migration. Seams will be overlapped by 3 inches and sealed with tape. |
Todd Blessing |
| 8/29/2012 |
Update or Other Action |
DEC staff approved of BGES' work plan titled "Work Plan for Indoor Air Sampling Activities At New Guardian Flight Facilty, 3444 West International Airport Rd, Anchorage International Airport". This work plan was dated August 16, 2012 and was in response to DEC request for confirmation from Guardian Flight that their new building design will mitigate vapor intrusion of volatile organic compouds. BGES will complete a building inventory and indoor air sampling questionnaire; collect ambient indoor air samples, and prepare a report. |
Todd Blessing |
| 10/22/2013 |
Site Visit |
ADEC conducted a site visit to the Guardian Flight Hangar to observe the installation of the vapor barrier. |
Meghan Dooley |
| 2/19/2016 |
Site Characterization Workplan Approved |
Approved work plan to install three wells and conduct monitoring. |
Lisa Krebs-Barsis |
| 9/7/2016 |
Update or Other Action |
At this time, the current project manager chooses to retain management of this site which has institutional controls. |
IC Unit |
| 6/14/2017 |
Document, Report, or Work plan Review - other |
Reviewed Well Installation and Groundwater Monitoring Report, dated December 2016. Two wells were installed in September 2016, MW-13 and MW-14. Wells MW-5, MW-10, MW-11, MW-12, MW-13, and MW-14 were sampled for GRO, DRO, and BTEX. Concentrations exceeded 18 AAC 75.345 Table C cleanup levels at wells MW-10 and MW-13. The estimated plume boundaries were generally consistent with the previous sampling event. Groundwater elevations suggested groundwater was flowing northwest. |
Wendy Hansen |
| 7/25/2017 |
Meeting or Teleconference Held |
DEC Staff met with ASIG and consultant AECOM to discuss status of site and path forward. A letter dated September 22, 2017 documents the meeting and subsequent communications. It was recommended that ASIG evaluate the status of the site and, if appropriate, propose to reduce or discontinue groundwater monitoring. In addition, future monitoring reports are to include historical data (product and analytical) and any work plan deviations. |
Wendy Hansen |
| 11/30/2017 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 77789 name: Jet Fuel Spills |
Wendy Hansen |
| 9/14/2018 |
Document, Report, or Work plan Review - other |
Reviewed Groundwater Monitoring Report dated August 2018. The report covers groundwater sampling conducted in December of 2017. Six wells (MW-5, MW-10, MW-11, MW-12, MW-13 and MW-14) were sampled for GRO, DRO, VOC, and PAH using a submersible pump and low flow methodology. Groundwater was estimated to be flowing to the northwest. Two new wells (MW-13 and MW-14) were not included in the gradient calculation because elevation data were not available. Concentrations of select VOC chemicals exceeded cleanup levels at MW-11. GRO, DRO, and select VOC and PAH chemicals exceeded cleanup levels at MW-10 and MW-13. GRO detections ranged from 0.050 J to 6.38 mg/l, DRO from 0.198 J to 2.72 mg/l, and benzene from 0.00044 to 0.961 mg/l. Estimated plume boundaries were consistent with previous events, except for area around MW-13 and MW-11. MW-13 did not exceed cleanup levels for GRO in 2017, where it had previously. VOC analysis was added in 2017, and now encompasses MW-11. |
Wendy Hansen |
| 9/21/2018 |
Document, Report, or Work plan Review - other |
Reviewed Former Plant 4 Facility Long-Term Groundwater Monitoring Plan Addendum (ADEC File No. 2100.26.036.05, Hazard ID 23582), dated September 7, 2018 and provided comments. |
Wendy Hansen |
| 11/5/2018 |
Document, Report, or Work plan Review - other |
Received Final Former Plant 4 Facility Long-Term Groundwater Monitoring Plan Addendum (ADEC File No. 2100.26.036.05, Hazard ID 23582), dated November 2, 2018. |
Wendy Hansen |
| 3/22/2019 |
Document, Report, or Work plan Review - other |
Reviewed Groundwater Monitoring Report dated February 2019, and provided comments. The report covers groundwater sampling conducted in November of 2018. Six wells (MW-5, MW-10, MW-11, MW-12, MW-13 and MW-14) were sampled for GRO, DRO, VOC, and PAH using a submersible pump and low flow methodology. Groundwater flow was not determined in 2018. Concentrations of 1,2,4-trimethylbenzene and napthalene exceeded cleanup levels at MW-11. GRO and DRO were below cleanup levels at this well. GRO (5.97 mg/l), DRO (3.27 mg/l), 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, benzene, ethylbenzene and total xylene exceeded cleanup levels at MW-10. DRO (3.19 mg/l), 1-methylnapthalene, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, benzene, ethylbenzene, napthalene, vinyl chloride, and total xylene exceeded cleanup levels at MW-13. Wells MW-5, MW-12, and MW-14 did not show exceedances of cleanup levels. The report recommended well repairs and re-surveying, delineation to the western direction, and conducting monitoring every three years. |
Wendy Hansen |
| 5/8/2019 |
Document, Report, or Work plan Review - other |
Received Final 2018 Groundwater Monitoring Report. The report was dated May 7, 2019 and satisfactorily addressed comments. |
Wendy Hansen |
| 7/24/2019 |
Document, Report, or Work plan Review - other |
Reviewed and approved work plan to install up to three wells west and northwest of the western property boundary (west and northwest of MW-9, MW-13, and WP-13) to fill data gaps, trim all existing site PVC monitoring well risers so security covers will close property, repair/replace damaged security casings/covers, survey all existing and new wells, conduct a free-product assessment at all existing (MW-5, MW-10, MW-11, MW-12, MW-13, and MW-14) and new wells, and collect analytical samples from wells without free product. Up to two samples are planned from each soil boring, one from the highest field screen result and the other from above the groundwater interface. Soil samples will be analyzed for GRO, DRO, and RRO. At least one sample from each boring (from the apparent most contaminated depth based on field screening) will also be analyzed for PAH and VOC. Groundwater samples will be analyzed for GRO, DRO, RRO, PAH, and VOC. |
Wendy Hansen |
| 11/1/2019 |
Offsite Soil or Groundwater Disposal Approved |
Staff approved for transport of material (soil/water) from the site via vacuum truck to Alaska Stormwater Maintenance at 300 95th Court in Anchorage where it will be decanted, containerized, and stored pending analytical data for final transport approval and disposition. The material was generated during the installation of a new well (MW-16). A vacuum truck was utilized due to proximity of utilities. |
Wendy Hansen |
| 11/5/2019 |
Offsite Soil or Groundwater Disposal Approved |
Staff approved for transport of material generated during installation of new well MW-16 that was transported via vacuum truck from the site to Alaska Stormwater Maintenance at 300 95th Court in Anchorage on 11/1/2019 to Menzies Ops Wash Bay for warm storage pending analytical data. The material was decanted from the vacuum truck and containerized at Alaska Stormwater Maintenance, resulting in seven 55-gallon drums (four water and three soil). |
Wendy Hansen |
| 1/28/2020 |
Offsite Soil or Groundwater Disposal Approved |
Staff approved for transport of less than 550 gallons of well investigation derived waste water generated from AFSC AIA Kilo Gates Hydrant System and this site to be treated at the US Ecology Viking Drive facility in Anchorage. In addition to petroleum constituents, the water potentially contained PFAS based on a composite sample collected of water from four Menzies Aviation sites, this site, AFSC AIA Kilo Gates Hydrant System Hazard ID 25860, AFSC AIA Former Bulk Fuel Tank Farm Hazard ID 2742, and AFSC AIA North Terminal Hazard ID 595. |
Wendy Hansen |
| 1/28/2020 |
Offsite Soil or Groundwater Disposal Approved |
Staff approved for transport of less than 220 gallons of soil investigation derived waste generated during well installation activities to be transported to US Ecology in Idaho. |
Wendy Hansen |
| 4/28/2020 |
Document, Report, or Work plan Review - other |
Reviewed report titled Former Plant 4 Facility Subsurface Investigation Report documenting 2019 well installation and monitoring activities, and provided comments. Activities included the installation of two new monitoring wells, MW-15 and MW-16. Two soil samples were collected during the installation of MW-15 and analyzed for GRO and DRO. The sample from the most contaminated depth interval based on field screening was also analyzed for PAH and VOCs. A hydro-vac was used to install MW-16. A composite soil/sediment sample was collected from the decanted material. 1,2-Dichlorothane was detected at MW-15 at 0.024 mg/kg at 10 feet below ground surface. No other contaminants were detected above cleanup levels in the soil samples. Groundwater samples were collected from all existing site wells (MW-5 and MW-10 through MW-16), and analyzed for GRO, DRO, VOCs and PAH. No product was identified in any of the wells. All site wells were surveyed. Data for the event indicated an overall flow direction to the east/southeast. Based on historical records, the groundwater flow in the vicinity of Plant 4 had been inferred to be to the north. However, data continues to support the possibility that groundwater flow may be influenced by seasonal levels of Lake Spenard. Comments included a request that long term monitoring continue to evaluate trends for volatile compounds and polynuclear aromatic hydrocarbons that have been detected but were not sampled prior to 2017. It was also requested that sampling of new wells MW-15 and MW-16 continue for a minimum of one more event.
Staff also re-visited review of a Long Term Monitoring Plan titled Former Plant 4 Facility Long-Term Groundwater Monitoring Plan Addendum, dated November 2, 2018 and submitted on November 6, 2018. A three year monitoring frequency was approved, with an annual inventory of the presence and condition of each well. |
Wendy Hansen |
| 9/1/2020 |
Update or Other Action |
ADEC issued a letter to Menzies responding to their August 20th letter requesting decommissioning of monitoring wells. ADEC requested Menzies address ADEC comments submitted on April 28, 2020. Monitoring wells on Alaska railroad right of way property could be replaced with wells further northwest. Decommissioning of other monitoring wells could be reviewed for approval and ADEC would evaluate if contaminants of concern exceed cleanup levels in the wells. |
Todd Blessing |
| 9/23/2021 |
Offsite Soil or Groundwater Disposal Approved |
Transport/disposal approval provided for 3 drums of soil cuttings generated during well abandonment/re-drill from site. US Ecology , 2020 Viking Dr. Anchorage, is the treatment facility. |
Shawn Tisdell |
| 7/29/2022 |
Site Characterization Report Approved |
This 12/2021 Subsurface Investigation report was an update to the 2019 report and includes 2021 site action. In July 2021 water level and free-phase product were gauged, no free product was observed. Groundwater samples were collected from seven wells. GRO was detected in 3 of the 7 wells, but only exceeded the CUL in MW-10(7.4 mg/L). DRO was detected in 6 wells, exceeding the CUL in MW-10(2.1 mg/L) and MW-13(2.1 mg/L). Benzene was detected in all samples, exceeding CULs in MW-10(370 µg/L) and MW-13(120 µg/L). Ethylbenzene was detected in 5 wells, but only exceeded the CUL in MW-10 (280 µg/L). Total xylene was detected in 5 wells, MW-10(1100 µg/L) and MW-13 (280 µg/L) were the only wells above CULs. For non BTEX VOCs, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene and naphthalene were above CULs in MW-10 and MW-13. Naphthalene was also above CULs in MW-11. For PAHs MW-10 contained 1- and 2-methylnaphthalene above CULs. Overall contaminant concentrations were reported to have declined from 2019. Wells MW-15 and MW-16 were decommissioned. |
Shawn Tisdell |
