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Site Report: ADOT&PF Cordova Maintenance Station

Site Name: ADOT&PF Cordova Maintenance Station
Address: MP 11.7 Copper River Highway, Cordova, AK 99574
File Number: 2215.38.023
Hazard ID: 1305
Status: Active
Staff: Joshua Barsis, 9072697691
Latitude: 60.500567
Longitude: -145.479753
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.


In 2005 a 20,000-gallon used-oil partially buried tanker car was removed from the Alaska Department of Transportation and Public Facilities Cordova Maintenance Station. Approximately 400 cubic yards of contaminated soil were removed and land spread at the Cordova Locke property (Hazard ID 1022), generally north of the land spread soil from the two former underground storage tanks (Hazard ID 24629). Additional information regarding potential contamination at this facility is tracked under the following Contaminated Sites Program database records: Hazard ID 26558, file number 2215.38.030 - Class V injection well. Hazard ID 24629, file number 2215.26.003 - 1997 removal of 3,000-gallon diesel underground storage tank (UST) and 1,000-gallon used oil UST.

Action Information

Action Date Action Description DEC Staff
8/13/1991 Site Added to Database Oil, solvents, and other contaminants. No Longer Assigned
12/18/1992 Site Ranked Using the AHRM 3 unknowns. Surface water exposure, Recreation area, and multiple values changed from site managers form. Insufficient comments provided to allow proper audit of scoring method. No Longer Assigned
10/20/1993 Site Ranked Using the AHRM Initial ranking. No Longer Assigned
5/11/2000 Site Ranked Using the AHRM Changed Toxicity Value from 1 to 2 due to non-chlorinated solvents and oil. Eileen Olson
1/18/2007 Update or Other Action File number updated to 2215.38.023. Aggie Blandford
6/25/2007 Update or Other Action Received Report for Groundwater and Soil Sampling at ADOT&PF Locke Salvage Yard. QA/QC conducted. Soil samples were collected from soil that had been landspread following removal of USTs at the DOT Cordova Maintenance Facility. Samples from the UST soil contained DRO up to 13,800 mg/kg, samples from the former tanker car soil contained DRO up to 3,110 mg/kg. No other analytes were detected above cleanup levels. Bill O'Connell
7/27/2007 Exposure Tracking Model Ranking Bill O'Connell
3/19/2008 Update or Other Action Additional site history, remediation and cleanup Information for this site can be found under file #2215.26.003 and LUST database for ADOT&PF Cordova Maintenance Station. Bill O'Connell
7/29/2008 Update or Other Action Work plan approved for ADOT Cordova Maintenance Station. Groundwater samples will be collected from 5 monitoring wells and the potable well at the site. The UST stockpile at the Locke property will be sampled using multi-increment, composite, and discreet sampling techniques. Bill O'Connell
9/3/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 72283 name: former waste oil tanker car Antoine Doiron
2/9/2009 Report or Workplan Review - Other Received groundwater and soil sampling report for ADOT&PF Cordova Maintenance facility. Groundwater samples were collected from MW-1, MW-2, and MW-3. MW-4 and MW-5 could not be located, so a surface water sample was collected from an adjacent slough. A sample was also collected from the facility's drinking water well. PCE was detected at 0.017 mg/l in MW-1, above the cleanup level of 0.005 mg/l. PCE was not detected in the other wells, but was detected in the slough at 0.002 mg/l. No analytes were detected in the potable well sample. Soil samples collected from stockpiled soil at the Locke Property found DRO up to 15,200 mg/kg in an MI sample that was dried prior to analysis. Due to a significant variation between dry and wet MI samples at the primary lab, the MI samples were submitted for prep and analysis at two other labs. The highest DRO concentration from the secondary labs was 10,200 mg/kg. The mean of the discrete samples was 9,360 mg/kg and the mean of the composite samples was 9,340 mg/kg suggesting a rather homogeneous stockpile. Bill O'Connell
3/22/2012 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 72283 former waste oil tanker car. Bill O'Connell
10/29/2012 Report or Workplan Review - Other Reviewed Work Plan for groundwater monitoring, landfarm tilling, and monitoring well decommissioning at Cordova Maintenance Facility. Five monitoring wells will be sampled for VOCs, two surface water samples will be collected from a slough near the source area and sampled for VOCs, a drinking water sample will be collected from the facility well and analyzed for VOCs, the landfarm at the adjacent Locke Property will be tilled using a tracked excavator and four soil samples will be collected after tilling and analyzed for DRO, and the five monitoring wells that remain at the Cordova Locke Property will be decommissioned in accordance with ADEC guidance. Bill O'Connell
7/5/2013 Report or Workplan Review - Other Reviewed Monitoring Well Decommissioning and Landfarm Tilling report for Cordova Maintenance Station. Monitoring wells B1MW through B5MW located at the Cordova Locke Property (ADEC File #2215.38.020) were decommissioned in accordance with ADEC Guidance. Soil from this site that was landfarmed at the Locke Property was tilled and four soil samples were collected from the areas with the highest field screening results. DRO was detected in each of the four samples from 6,200 mg/kg to 8,010 mg/kg. Two surface water samples were collected from a slough located near the former source area and a drinking water sample was collected from the facility well. Contaminants were not detected in any of these samples. Groundwater samples were collected from monitoring wells MW-1, MW-2, and MW-3 located near the source area. Wells MW-4 and MW-5 could not be located. Contaminants were not detected above cleanup levels in the groundwater samples. Keather McLoone
3/27/2014 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 72283 former waste oil tanker car. Joshua Barsis
6/16/2014 Report or Workplan Review - Other The CSP received a Well Decommissioning and Land Farm Sampling report, dated June 2014 for the ADOT&PF Cordova Maintenance Station site. The report documented tilling and soil sampling of a 100 cubic yard (cy) land farm, soil sampling of a 400 cy land farm, groundwater sampling of Monitoring Well MW4, and decommissioning Monitoring Wells MW1, MW2, MW3, and MW5. All soil and groundwater samples were submitted for one or more of the following: GRO, DRO, RRO, and/or VOCs. Both land farms exhibited concentrations of DRO above migration to groundwater cleanup levels; the 100 cy land farm exhibited concentration of DRO above ingestion cleanup levels. The groundwater sample did not exhibit contaminants above the ADEC cleanup criteria. Joshua Barsis
7/28/2014 Update or Other Action On July 9, 2014, Monitoring Well MW4 was decommissioned and three soil samples were collected from the 100cy land spread soils, located on the Locke Property. The soil samples were analyzed for DRO only, one of which was also analyzed for DRO with silica gel to assess for potential biogenic contribution. Analytical results were received on July 27, 2014 and revealed that all soil samples, including the silica sample, exhibited concentrations of DRO ranging from 7,530 mg/kg to 8,890 mg/kg. Joshua Barsis
11/18/2016 Update or Other Action Letter sent on this day with s brief site history and to outline existing data gaps. Joshua Barsis

Contaminant Information

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