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Site Report: MOA Anchorage Regional Landfill

Site Name: MOA Anchorage Regional Landfill
Address: 15500 East Eagle River Loop Road, Eagle River, AK 99577
File Number: 2107.26.013
Hazard ID: 24063
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 61.295341
Longitude: -149.596074
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

The MOA Anchorage Regional Landfill site was issued a cleanup complete determination on December 23, 2021. This decision is based on review of the MOA Anchorage Regional Landfill site files and the 1998 Soil Leaching Assessment results that indicate residual contamination at this site is unlikely to reach groundwater as noted in the 2017 Cleanup Complete letter. The UST is located within the boundaries of an active landfill where groundwater monitoring is conducted annually. Naphthalene and DRO exceeded their respective 18 AAC 75 Table B1/B2 Migration to Groundwater cleanup levels at the base of the excavation with concentrations of 0.072 mg/kg and 842 mg/kg, respectively.

Action Information

Action Date Action Description DEC Staff
8/9/1990 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 78068 Diesel contamination. Former Staff
8/9/1990 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU Date changed DB conversion Former Staff
8/9/1990 Site Added to Database Former Staff
8/8/1991 Release Investigation Partial release investigation conducted with excavation work around the tank. Robert Weimer
10/8/1991 Underground Storage Tank Site Characterization or Assessment Tank left in place, some contaminated soil was removed on one side of the tank. Up to 2300 mg/kg DRO in the soil. No testing for GRO and BTEX. Tank was repaired, recertified, and put back in service. Former Staff
11/20/1997 Potentially Responsible Party/State Interest Letter ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: MUNICIPALITY OF ANCHORAGE SWS Former Staff
5/7/1998 Document, Report, or Work plan Review - other Reviewed 4/14/98 leaching assessment. The leaching assessment is based on incomplete data and unsubstantiated assumptions. No alternative cleanup levels are approved. Former Staff
9/16/1998 Update or Other Action ADEC letter requests that the vertical extent of contamination be determined. Former Staff
11/26/1999 Update or Other Action ADEC request monitoring well workplan by 3/1/00. Former Staff
8/17/2000 Update or Other Action ADEC sends second request for workplan. Originally requested was on 11/26/99. Former Staff
12/10/2004 Update or Other Action Reviewed site file, no workplan submitted to date. Robert Weimer
10/21/2005 Update or Other Action No workplan submitted to date. Robert Weimer
9/19/2006 Update or Other Action File number issued 2107.26.013 (FKA L69.16). Aggie Blandford
6/2/2008 Exposure Tracking Model Ranking Site ranked on the new Exposure Tracking Model (ETM). The ETM is a new site ranking system that looks at, based on available data, the potential exposure pathways for the contamination remaining at the site. Robert Weimer
1/7/2011 Update or Other Action No workplan submitted to date. Robert Weimer
10/28/2011 Update or Other Action Need sampling to determine current concentrations of DRO, GRO, and BTEX to evaluate site for closure. Robert Weimer
11/12/2013 Meeting or Teleconference Held Meeting with MOA to discuss site status and future site work. MOA is to submit missing reports (if any) and provide RI work plan. Robert Weimer
1/22/2016 Potentially Responsible Party/State Interest Letter This second PRP letter was sent to fill in a gap in the administrative record. Kara Kusche
1/22/2016 Update or Other Action Letter sent requesting workplan to delineate vertical extent of remaining contamination. DEC requested response from MOA of intended action by 2/15/16. Kara Kusche
5/11/2017 Cleanup Complete Determination Issued Remaining contaminants of concern are below the human health cleanup levels, but exceed the soil migration to groundwater cleanup levels. Sufficient characterization and landfill perimeter groundwater monitoring has been completed and ADEC has made a determination that the remaining contaminants in soil are steady-state or decreasing and will not migrate to groundwater. Kara Kusche
9/21/2018 Site Reopened The dispenser and piping were upgraded in 2017. Soil contamination was observed and soils were excavated, however confirmaiton samples indicate DRO and naphthalene remain above cleanup levels. Kara Kusche
9/21/2018 Update or Other Action Closure evaluation completed by ADEC- Site has been horizontally characterized, but has not been vertically characterized. DRO and naphthalene remain below human health, but above migration to groundwater cleanup levels. Kara Kusche
10/11/2018 Meeting or Teleconference Held Meeting held with MOA Solid Waste staff to discuss site status and data gaps preventing site closure. MOA staff state they will consider method 3. Kara Kusche
12/22/2021 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78068 10,000 Gallon UST #1 & Fuel Island. Kelly Walker
12/27/2021 Cleanup Complete Determination Issued Based on review of MOA Anchorage Regional Landfill site files and 1998 Soil Leaching Assessment, ADEC agrees that residual contamination at this site is unlikely to reach groundwater, as noted in the 2017 Cleanup Complete letter. The UST is also located within the boundaries of an active landfill where groundwater monitoring is conducted annually and in a paved area, limiting infiltration. Residual concentrations of naphthalene and diesel range organics (DRO) exceeded their respective 18 AAC 75 Table B1/B2 Migration to Groundwater cleanup levels at the base of the excavation with concentrations of 0.072 mg/kg and 842 mg/kg, respectively. 2021 Cleanup Complete letter is attached to the site in the CSP database. Kelly Walker
12/27/2021 Institutional Control Record Removed Institutional Controls have been removed. Kelly Walker

Contaminant Information

Name Level Description Media Comments
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Residual DRO contamination is 842 mg/kg. Unlikely to reach groundwater at concentrations above this level.
Naphthalene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Residual naphthalene concentration is 0.072 mg/kg. Unlikely to reach groundwater at concentrations above this level.

Control Type

Type Details
No ICs Required

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.
Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70)
Hazard ID Site Name File Number
609 Municipality of Anchorage Landfill 2107.38.017
26625 MOA Anchorage Regional Landfill Cell 9 2107.38.025

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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