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Site Report: St. Paul Airport TDX POSS Camp

Site Name: St. Paul Airport TDX POSS Camp
Address: St. Paul Airport; SW End of Runway; POSS Camp, Saint Paul, AK 99660
File Number: 2644.38.045
Hazard ID: 26534
Status: Active
Staff: Stacee Henderson, 9072628202 stacee.henderson@alaska.gov
Latitude: 57.158535
Longitude: -170.230998
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

In December, 2014, the above ground day tank in the generator building at the Saint Paul Airport POSS (Petroleum Oil Support Services) Camp overflowed spilling approximately 2,400 gallons of diesel onto the bare ground below the generator. Free product recovery began immediately. The modular building that housed the generator and day tank was moved to facilitate excavation. The spill source area was excavated to 7.5 feet below ground surface until a silt layer, continuous in the base of excavation, was encountered. Approximately 253 cubic yards of material were placed in a containment cell constructed on Polovina Hill. The lateral extent of excavation was bounded to the south and east by buried power lines. Samples collected from the south and west sidewalls exceeded migration to groundwater cleanup levels for diesel range organics (DRO) at 4,710 mg/kg and 6,610 mg/kg, respectively. The sample collected from the east sidewall was 17,800 mg/kg DRO and 343 mg/kg gasoline range organics (GRO). Samples collected from the base of the excavation and north sidewall did not exceed cleanup levels for contaminants of concern. Groundwater was not encountered during the excavation and the depth to groundwater is not known. No samples were collected from the contaminated soil cell. Groundwater wells are the source of drinking water for the City of St. Paul. The nearest Saint Paul drinking water well is approximately 2,500 feet west of the source area. Nearest drinking water well recorded is 0.5 miles.

Action Information

Action Date Action Description DEC Staff
3/21/2016 Potentially Responsible Party/State Interest Letter Potentially Responsible Party / State Interest Letter sent to Tanadgusix Corporation by PPR staff Mark Sielaff. Mitzi Read
3/22/2016 Spill Transferred from Prevention Preparedness and Response Program Spill transferred by PPR staff Lisa Krebs-Barsis. Spill no. 14259933401; spill date = 12/1/14; substance = diesel; quantity = 2,400 gallons; source = aboveground day tank in generator building. Mitzi Read
3/23/2016 Site Added to Database A new site has been added to the database Mitzi Read
3/24/2016 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79895 name: Diesel from Generator Day Tank (AST) Mitzi Read
3/25/2016 Potentially Responsible Party/State Interest Letter Potentially Responsible Party letter sent to John Lyons of TDX Power, Inc. on this date. Nathan Maxwell
3/28/2016 Update or Other Action Received Release Investigation Report dated November 2015 via email on this date. This report outlined additional excavation that occurred in September of 2015. Nathan Maxwell
4/4/2016 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79895 Diesel from Generator Day Tank (AST). Nathan Maxwell
7/28/2016 Site Characterization Workplan Approved Work plan received on 7/20/2016, approved on this date. WHPacific plans to dig additional test pit(s) to the west of the initial spill and excavation on the other side of the nearby road to determine the lateral extent of contamination. Land farming is also planned for the approximately 650 cubic yards of contaminated soil from the initial excavation. Nathan Maxwell
2/7/2017 Update or Other Action According to ADNR and ADEC database, the nearest drinking water well is 0.5 miles from the site. Erin Gleason
2/22/2017 Document, Report, or Work plan Review - other Received characterization report on 2/1/2017. Requested additional information from WHPacific 2/8/2017. WHPacific provided additional information on 2/14/2017. Report approved. Erin Gleason
3/24/2017 Document, Report, or Work plan Review - other Reviewed February 2017 report. Requested changes/additions via letter. Revised report due April 30, 2017. Erin Gleason
5/3/2017 Site Characterization Report Approved Erin Gleason
5/10/2017 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79895 Diesel from Generator Day Tank (AST). Erin Gleason
9/7/2017 Update or Other Action Spoke with Keith Guyer at WHPacific. The soil piles were aerated twice in June, twice in July and three times in August. Odor has gone down but still detectable if you get close to the dirt. Erin Gleason
10/11/2018 Update or Other Action Landfarm was tilled two times during summer 2018 due to unpredicted equipment failure. TDX will secure the landfarm for the winter and resume operations in the spring. Erin Gleason
12/16/2019 Update or Other Action Overdue report letter sent to TDX on this date. Erin Gleason
1/14/2020 Update or Other Action Letter from 12/16/2019 returned due to wrong address. Erin Gleason
1/14/2020 Update or Other Action Overdue report letter sent to TDX on this date with updated address. Erin Gleason
2/3/2020 Update or Other Action Spoke to Keith Guyer at Kuna energy. Due to staffing changes at TDX in summer 2019 no work was done. Landfarm is still in place, but with no cover. Erin Gleason
2/3/2020 Update or Other Action Received photos of the landfarm that were taken on 1/18/2020. Landfarm appears intact. The landfarm was not tilled during 2019 because of lack of equipment on the island. Erin Gleason
3/10/2021 Update or Other Action Letter sent to TDX on this date requesting information about landfarm operations per the approved work plan. Erin Gleason
3/22/2021 Update or Other Action Received update from Kuna Engineering regarding the landfarm. The soils are covered during winter months. In 2020 the soil was turned at least twice each month from May to October. Despite frequent turnover, in late 2020 the soil still presented some odor concerns. The soil is currently covered and later this spring will be evaluated for next steps (hand shovel and smell via plastic bag). An assessment on the need for further treatment (landfarm turnovers) and/or sampling will be determined. Erin Gleason
3/24/2021 Meeting or Teleconference Held Meeting with TDX, ADEC, and Kuna to discuss how to increase natural attenuation in the land farm. Erin Gleason
2/10/2023 Update or Other Action Communication with RP on this date. DEC requested an update on the landfarm, Kuna Engineering stated that a short letter report will be submitted in the next week or so. Soils in the landfarm were rotated again in Summer 2022. Naomi Mason
3/24/2023 Workplan Requested Landfarm report received on March 2, 2023, samples were collected on October 21, 2022. The collection and storage methods for which samples were obtained could bias results low and therefore cannot be used to evaluate the current conditions of the landfarm. Work plan addendum requested to be submitted for ADEC review prior to collecting further laboratory analytical samples to evaluate the landfarm for closure. Naomi Mason
3/7/2024 Site Characterization Report Approved The ADEC reviewed and approved the revised “2023 Landfarm Sampling Report”, dated February 9, 2024. The report generally describes the field activities that took place on September 12, 2023, in accordance with the approved "Site Monitoring and Sampling and Analysis Plan" dated September 2023. Work included triplicate Incremental Sampling Methodology (ISM) of the 4,200 square-foot landfarm. Each replicate was comprised of 30 increments. Soil samples exceeded CULs for DRO (378 mg/kg) and were either not detected or below CULs for GRO, RRO, VOCs, and PAHs. The ADEC concurred continued landfarming and site monitoring should continue. Augmentation of the biological activity within the landfarm may be considered. Approval by ADEC is required prior to any augmentation activities. Additional site monitoring and/or corrective action is required based on the results of soil sampling, and a workplan was requested. Stacee Henderson

Contaminant Information

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Control Type

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Description Details

No associated sites were found.

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State of Alaska Department of Environmental Conservation

P.O. Box 111800
Juneau, AK 99811-1800
Phone: 907-465-5066
Fax: 907-465-5245
TDD: 800-770-8973
Physical Location: 410 Willoughby