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Site Report: AFSC Off-Airport Fuel Facility - Port of Anchorage


Site Name: AFSC Off-Airport Fuel Facility - Port of Anchorage
Address: 1331 Tidewater Road; Port of Anchorage, Anchorage, AK 99501
File Number: 2100.38.243
Hazard ID: 25946
Status: Active
Staff: Wendy Hansen, 9072693059 wendy.hansen@alaska.gov
Latitude: 61.234303
Longitude: -149.884648
Horizontal Datum:WGS84

We make every effort to ensure the data presented here is accurate based on the best available information currently on file with DEC. It is therefore subject to change as new information becomes available. We recommend contacting the assigned project staff prior to making decisions based on this information.

Problems/Comments

Various spills at the Anchorage Fueling and Service Company facility at the Port of Anchorage resulted in groundwater and soil contamination at the site. A 1992 report shows EPH (~DRO) up to 5,000 mg/kg and VPH (~GRO) up to 6,900 in soil and EPH up to 13 mg/L and VPH up to 110 mg/L in groundwater. Monitoring reports from 2010 to 2012 show significantly reduced contaminant concentrations in groundwater.

Action Information

Action Date Action Description DEC Staff
11/19/2012 Site Added to Database A new site has been added to the database Mitzi Read
11/21/2012 Report or Workplan Review - Other Reviewed Subsurface Investigation AFSC Plant No.1 Report dated November 1992. Nine soil borings were advanced and sampled at the site and monitoring wells were installed into seven of the boreholes. Wells were screened from 3-10 ft bgs. Soil sampled from boreholes MW-3, MW-4, MW-5, and MW-7 contained contaminant concentrations above cleanup levels with VPH (~GRO) up to 5,000 mg/kg at MW-4 and EPH (~DRO) up to 6,900 mg/kg in the same sample. Groundwater samples contained contaminants above cleanup levels in wells MW-2, MW-3, MW-4, MW-5, and MW-6, with VPH up to 20 mg/L, EPH up to 110 mg/L, and benzene up to 0.14 mg/L. Bill O'Connell
11/21/2012 Report or Workplan Review - Other Reviewed 2010 groundwater monitoring report. Samples were collected from MW-3, MW-4, MW-6, MW-7, MW-8, and MW-9. Contaminants were detected above cleanup levels in MW-3 and MW-4. Historical data tables in this report indicate that since 2001, contaminants have not been detected above Table C cleanup levels in groundwater samples from MW-9 and MW-7. MW-8 has had DRO above the cleanup level during one sampling event only. MW-3 and MW-4 consistently contain concentrations of GRO and DRO above the cleanup level. MW-6 had high concentrations of GRO in 2006, 2007, and 2009, but below cleanup levels or ND during all other sampling events. Bill O'Connell
11/21/2012 Report or Workplan Review - Other Reviewed 2011 groundwater monitoring report. Samples were collected from MW-3, MW-6, MW-7, MW-8, and MW-9. MW-1 was locked and MW-5 was damaged. DRO was detected above the cleanup level in MW-3 at 1.8 mg/l. no other samples contained contaminants above cleanup levels. Bill O'Connell
11/21/2012 Report or Workplan Review - Other Reviewed 2012 Groundwater monitoring report. Samples were collected from MW-3, MW-6, MW-7, and MW-9. MW-4 contained 0.01 foot LNAPL and was not sampled and MW-5 and MW-8 appeared to be damaged and could not be sampled. DRO was detected at 12.9 mg/l in MW-3 and 3.23 mg/l in MW-6. No other samples exceeded cleanup levels. Bill O'Connell
11/21/2012 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79360 name: Bulk Fuel Storage Bill O'Connell
2/4/2014 Potentially Responsible Party/State Interest Letter PRP letters sent to landowner and RP Bill Janes
8/13/2014 Site Characterization Report Approved On this date ADEC received the 2013 Annual Groundwater Sampling Off-Airport Fueling Facility submitted by Ahtna dated September 5, 2013. Samples were collected from MW-3 and MW-6 to MW-9. MW-4 contained 0.13 foot LNAPL and was not sampled and MW-5 appeared to be damaged and could not be sampled. MW-3 was the only well sampled that contained contaminant concentrations above method two cleanup levels. MW-3 contained DRO at 54.4 mg/L and GRO at 3.16 mg/L. Grant Lidren
9/17/2014 Report or Workplan Review - Other On this date, ADEC received the 2014 Sampling Work Plan, Off-Airport Fuel Facility at the Port of Anchorage submitted by Ahtna. Grant Lidren
10/8/2014 Site Characterization Report Approved On this date ADEC received the 2014 Annual Groundwater Sampling Off-Airport Fueling Facility submitted by Ahtna dated October 6, 2014. Groundwater samples were collected from MW-1, MW-3, and MW-6 to MW-9. MW-4 contained 0.01 foot LNAPL and was not sampled and MW-5 appeared to be damaged and could not be sampled. MW-3 was the only well sampled that contained contaminant concentrations above method two cleanup levels with DRO at 8.7 mg/L. (Note: DRO was detected in MW-1 at 0.99 mg/L, but is considered biased low due to LCS/LCSD and lab dup RPD less than recovery limits). Grant Lidren
9/29/2016 Report or Workplan Review - Other Reviewed annual groundwater monitoring report for 2016. On July 8, 2016 groundwater samples were collected from MW-1, MW-3, MW-6, MW-7, MW-8 and MW-9. MW-4 could not be located and was not sampled and MW-5 has a damaged well casing and could not be sampled. From recent historical data available there is not a MW-2. No LNAPL was observed in any of the wells. All samples taken were analyzed for BTEX, GRO and DRO. Benzene was detected in MW-3 above ADEC cleanup level at 0.052 mg/L. DRO was detected in MW-3 above ADEC cleanup level at 4.26 mg/L. All other analytes tested were below ADEC cleanup levels. Darren Mulkey
1/31/2017 Report or Workplan Review - Other Review of the Final Soil Boring Installation and Well Replacement of Monitoring Well MW-4. Based on PID response, the majority of the soil contamination was encountered from 3-10 feet bgs, with the highest reading detected from 5.0-5.5 feet bgs. The laboratory analytical samples collected confirmed that DRO and GRO concentrations in soil are above the respective ADEC cleanup levels at this location. Although no LNAPL was detected during sample collection activities, concentrations of DRO, benzene, and xylenes were detected above their respective ADEC cleanup levels. As suspected, groundwater flow direction at the site is to be to the northwest, toward monitoring well MW-3, at a grade of approximately 0.0034 feet per foot. Darren Mulkey
7/12/2017 Meeting or Teleconference Held DEC staff met with ASIG A. Tuttle and consultant Ahtna Environmental, Inc. to discuss status and path forward. Groundwater monitoring will continue at MW-3 and MW-4R to include analysis of VOCs and PAHs. The plume will need to be delineated beyond MW-3 and MW-4R to the west/northwest for closure. ASIG is proposing to decommission wells MW-1, MW-6, MW-7, MW-8 and MW-9 where concentrations of contaminants have been below cleanup levels for the past five sampling events and MW-5 which is damaged. Wendy Hansen
12/14/2017 Report or Workplan Review - Other Staff reviewed the 2017 Annual Groundwater Monitoring Report. The report summarizes groundwater monitoring conducted in August 2017 at seven wells, MW-1, MW-3, MW-4R, MW-6, MW-7, MW-8, and MW-9. MW-5 remains damaged, and was not sampled. Analyses included GRO, DRO, VOCs (including BTEX) and PAHs. No LNAPL was observed in any of the wells. Napthalene was detected at MW-1 above the cleanup level. DRO, 1,2,4 trimethylbenzene, naphthalene, 1-methylnapthalene, and 2-methylnapthalene were detected at MW-3 and MW-4 above cleanup levels. GRO, xylene, ethylbenzene, and benzene were also detected at MW-4R above cleanup levels. No contaminants were detected above cleanup levels in other wells. The plume has not been delineated to the west/northwest beyond MW-3 and MW-4R. Wendy Hansen

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details

Requirements

Description Details

There are no documents for this site report.

Missing Location Data

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