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Site Report: ADOT&PF Girdwood Maintenance Station


Site Name: ADOT&PF Girdwood Maintenance Station
Address: Mile 86 of the Seward Hwy &Monarch Mine Road, Girdwood, AK 99587
File Number: 2110.26.003
Hazard ID: 23402
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 60.945400
Longitude: -149.174800
Horizontal Datum:NAD83

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

During the removal of two 2,000 gallon diesel and gasoline underground storage tanks on July 1, 1997 and one 2,000 gallon heating oil AST in 1999, soil and groundwater contamination was encountered. GRO, DRO and Benzene contamination was a result of historic over filling. Approximately 755 cubic yards of contaminated soil was transported and thermally remedeated at Alaska Soil and Recycling in Anchorage. Continual groundwater monitoring will be done as funding becomes available. Updated 11-15-06 Alyce Hughey.

Action Information

Action Date Action Description DEC Staff
7/1/1997 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77630 * Not Assigned
7/1/1997 Leaking Underground Storage Tank Cleanup Initiated - Petroleum * Not Assigned
7/1/1997 Site Added to Database * Not Assigned
4/8/1998 Report or Workplan Review - Other Colin Basye sent a review with comments letter after reviewing the Final Field Report Girdwood Facility, from DOWL Engineers, dated February 1998. Alyce Hughey
4/13/1998 Update or Other Action Colin Basye sent a second letter with additional comments and concerns to the Final Field Report. Alyce Hughey
4/24/1998 Update or Other Action Colin Basye sent a letter asking if groundwater was encountered during the removal of the tanks. Alyce Hughey
12/1/2003 Release Investigation Four Groundwater monitoring wells were installed , developed and sampled December 2003. Quarterly GW montioring events scheduled. Excavation scheduled for May 04. David Allen
12/2/2003 Release Investigation Conditional approval of Release Investigation Plan 12/2/03. Alyce Hughey
6/9/2004 Update or Other Action File number assigned and entered into the Fileroom DB and LUST DB. Alyce Hughey
2/14/2005 Report or Workplan Review - Other December 28, 2004 Groundwater Monitoring Report prepared by Shannon & Wilson was reviewed. Two wells (B2MW and B4MW) exceeded Table C levels. B4MW was considered upgradient and report indicates other sources may have contributed to impacts. Recommendation is to install 2 new wells to fill data gaps. Jim Frechione
7/22/2005 Report or Workplan Review - Other Reviewed file and reports. Sent an e-mail to DOT and S&W requesting copies of missing reports/data as well as project status update. From the information provided, there is soil and GW remaining with contamination above ADEC cleanup levels. Donald Seagren
7/28/2005 Report or Workplan Review - Other Reviewed release Investigation and GW monitoring report. After comparing with the project file and approved work plan, sent e-mail for clarification on work not in report. Response was work not completed due to inability to coordinate empty tankage. Donald Seagren
7/29/2005 Update or Other Action Sent letter outlining assessment and monitoring requirements needed prior to development of CAP for implementation during 2006. Donald Seagren
2/27/2006 Underground Storage Tank Site Characterization or Assessment Review and approve site assessment/remediation work plan. Donald Seagren
10/9/2006 Update or Other Action RFP for groundwater monitoring in spring 2007 issued to Term Contractor Shannon & Wilson. Donald Seagren
10/12/2006 Conditional Closure Approved Residual soil and GW contamination remain on site. Remaining contamination not a risk to human heath or the environment. Soil contamination around AST will be addressed when the tank is moved and the soil becomes accessible. Donald Seagren
10/12/2006 Long Term Monitoring Established LTM established for on-site drinking water well and monitor wells until two consecutive annual monitoring events demonstrate that all contaminant levels in all MWs are below applicable groundwater cleanup levels. GW sampling will be performed in the spring of 2007. Donald Seagren
10/12/2006 Institutional Control Record Established * Not Assigned
11/15/2006 Update or Other Action Using the Facility Map in the file, in conjunction with TopoZone Pro and the DNR Recorders Office, entered the coordinates for this site. Metadata includes No Topo Basemap, Aerial Photos, TopoZone Pro Street Maps, on a Medium Size Map, View Scale 1:9,840, Coordinate Datum NAD83. High degree of confidence in accuracy of location. Alyce Hughey
2/14/2007 Exposure Tracking Model Ranking Initial ETM ranking completed by Don Seagren. * Not Assigned
7/5/2007 Report or Workplan Review - Other Reviewed a groundwater monitoring report; 3 of 6 MWs contained at least 1 target analyte concentration. Only B2MW (and the duplicate) had DRO levels exceeding cleanup levels. B4MW could not be sampled due to ice in well. Monitoring to continue subject to available funding. Donald Seagren
8/16/2007 Update or Other Action Approved a contaminated soil segregation plan to be used during reconstruction of the maintenance station which burned to the ground in early 07. Donald Seagren
6/13/2008 Update or Other Action Site transferred from Don Seagren to Paul Horwath per Linda Nuechterlein. Alyce Hughey
8/18/2008 Update or Other Action A groundwater sampling event to include the facility water supply well and the monitoring wells is tentatively scheduled to occur in late summer or fall of 2009. Paul Horwath
12/28/2010 Site Characterization Report Approved Reviewed Term Contractor SLR's 2010 Ground Water Monitoring Report, for groundwater samples collected in June and July, 2010. Report is dated November 2010. GW samples from the 4 MWs samples met ADEC GW cleanup levels. Paul Horwath
12/29/2010 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 77630 name: ust Paul Horwath
12/29/2010 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77630 ust. Paul Horwath
4/3/2012 Update or Other Action The monitoring wells can be decommissioned and long-term groundwater monitoring discontinuted. Paul Horwath
4/3/2012 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77630 ust. Paul Horwath
6/18/2013 Long Term Monitoring Complete Long-term groundwater monitoring discontinuted based on the groundwater samples collected in June and July of 2010. The groundwater samples from the 4 monitoring wells met ADEC groundwater clenaup levels. The monitoring wells can be decommissioned. Alyce Hughey
6/25/2014 Report or Workplan Review - Other Paul Horwath approved the Shannon & Wilson's June 18, 2014 Work Plan for Groundwater Monitoring Well Decommissioning for the ADOT&PF Girdwood Maintenance Station site. Alyce Hughey
11/6/2014 Institutional Control Update Current project manager chooses to retain management of the site at this time. Kristin Brown
12/10/2014 Update or Other Action All groundwater monitoring wells that could be located were decommissioned under the oversight of ADEC term contractor Shannon & Wilson in July, 2014. Paul Horwath
9/15/2016 Institutional Control Compliance Review IC compliance review conducted. Staff changed from Paul Horwath to IC Unit. Closure/IC Details added, contaminants of concern in groundwater changed from above to below Table C levels to reflect monitoring results, and groundwater monitoring requirement removed from ICs. All other ICs remain in effect. IC reminder letter issued to ADOT&PF on this date. Reminder system set to follow-up every five years. Kristin Brown

Contaminant Information

Name Level Description Media Comments
BTEX Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
BTEX < Table C Groundwater
DRO < Table C Groundwater
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
GRO > Table C Groundwater
GRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
RRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
RRO < Table C Groundwater

Control Type

Type Details
Other CS Database Notation and Letter to Landowner/RP

Requirements

Description Details
Groundwater Use Restrictions Installation of GW wells at this facility is prohibited without prior review and approval by ADEC.
Excavation / Soil Movement Restrictions When (or if) the AST is moved and/or the impacted soil becomes accessible, ADEC shall be contacted for appropriate action. ADEC must approve any excavation, transport, remediation, and/or disposal of soil from the site.
Advance approval required to transport soil or groundwater off-site. Standard condition.
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) Standard condition.

Missing Location Data

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