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Site Report: ADOT&PF Sitka Airport S&C Building


Site Name: ADOT&PF Sitka Airport S&C Building
Address: Near 605 Airport Drive, Sitka Airport, Sitka, AK 99835
File Number: 1525.38.024
Hazard ID: 3867
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 57.054444
Longitude: -135.365889
Horizontal Datum:

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

Petroleum contamination was encountered while decommissioning a water main located between the Mountain Aviation hangar and the access road to Air Station Sitka (USCG). The source of is undetermined but the petroleum range and location suggest heating oil. Along the bedding of the waterline, 480 cubic yards of petroleum impacted material was field screened from clean soil. The limits of contamination in the subsurface were found and all contaminated soil was transported from the site and stockpiled between liners. Stockpiled soil was screened down to 400 cubic yards and lab analysis average concentrations are 3460ppm DRO and 396ppm GRO. Bioremediation cell plan was approved for placement on State property on Charcoal Island near hangers at the southeast end of the main runway. Lot 1 and 1A Block 400 is between CG Air Station Sitka and the ADOT&PF Sitka Airport Maintenance Shop.

Action Information

Action Date Action Description DEC Staff
7/8/2002 Site Characterization Workplan Approved Workplan approved to characterize former waterline bedding. Bruce Wanstall
7/15/2002 Proposed Plan Approval granted to screen stockpile soil to 2" material. Bruce Wanstall
7/15/2002 Site Added to Database Petroleum release to soil. Source not determined. Bruce Wanstall
7/19/2002 Site Ranked Using the AHRM Preliminary ranking. Bruce Wanstall
10/10/2002 Update or Other Action Cleanup Action Final Report received. Soil samples from the excavation of the abandoned waterline had concentrations below default Method 2 cleanup levels Approximately 480 cubic yards of soils screened to 2 inches or less is temporarily stored in a lined containment cell on DOT&PF property adjacent to the Sitka Airport runway on Charcoal Island. Bruce Wanstall
1/24/2003 Update or Other Action Corrective Action Plan for contaminated soil received. Comments and approval letter for biocell workplan drafted and circulated for SE Ops peer review. Multiple biocells plans are proposed for Charcoal Island properties. Bruce Wanstall
2/4/2003 Update or Other Action Per telephone request by staff, location map for contaminated soil biocell recieved. Bruce Wanstall
4/3/2003 Update or Other Action CAP biocell plan approval with comments. Biocell located near end of aircraft runway on Charcoal Isl. Letter copied to G: SPAR/ SparCS/ SE Field Ops/ SE Sites/ Sitka Airport DOT&PF S&C Blg/ Charcoal Isl Biocell Plan Bruce Wanstall
7/17/2003 GIS Position Updated Site inspection: Global Positioning Source used to obtain latitude and longitude readings based on North American Datum 27: N 57.0544 and W-135.3662. Bruce Wanstall
2/26/2004 GIS Position Updated Updated lat/long data using GPS readings from Bill Janes 2/13/04 field trip. Cliff Walden
8/26/2004 Update or Other Action Requested RP till the soil stockpile. Bruce Wanstall
10/27/2004 Update or Other Action Requested stockpile cover check. Bruce Wanstall
4/21/2005 Update or Other Action Contact RP to coordinate site visit/ inspection of the Charcoal Island biocell in July. Bruce Wanstall
6/15/2005 Update or Other Action Message sent requesting stockpile sampling plan. Reply stated that a plan is being developed in conjunction with the Tongass Avenue Road Project on Japonski Island from which contaminated soil is expected to be found. Bruce Wanstall
8/4/2006 Update or Other Action Ledger code updated. Bruce Wanstall
5/9/2007 Update or Other Action ADEC held discussion with ADOT about land status of Charcoal Island HOT USTs and the ADOT S&C Blg contaminated soil stockpiles. ADOT will look into the status of soil stockpiles in the area and confirmed that the land is State-owned and future use is a runway safety zone covered in asphalt. Bruce Wanstall
7/5/2007 Exposure Tracking Model Ranking The controlling pathway is direct contact with subsurface soil. The exposure route to industrial workers and occasional visitors is minimized by an asphalt cap over the utility trench footprint where soil removal recovery to most conservative migration to groundwater cleanup levels was successful. Bruce Wanstall
10/8/2007 Update or Other Action Review and comment on the draft workplan for soil stockpile assessment. Approval for the final version of the workplan was sent by email. Bruce Wanstall
2/5/2008 Report or Workplan Review - Other ADEC evaluated the draft 2007 UST Site Assessment Report by SLR. The data and conceptual site model meet CS quality assurance criteria. In fall 2006,DEC provided approval for ADOT&PF engineering staff to land spread the treated stockpile soil located at the southeast end of the main aircraft runway on Charcoal Island as sub base in an airport construction project. In 2007, the DEC term contractor SLR visited the site and confirmed that the stockpile footprint was thoroughly vegetated and DEC waived collecting samples for residual contamination of native soil. Bruce Wanstall
3/12/2009 Final Cleanup Report Reviewed Final Reports for the Sand and Chemical Building and Mountain Aviation site cleanups were reviewed for requirements in 18 AAC 75.375 and 75.380 and are adequate to consider a cleanup complete - institutional control determination. Bruce Wanstall
2/7/2012 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 74842 Heating oil tank and Mobile Truck. Bruce Wanstall
2/29/2012 Cleanup Complete Determination Issued Based on the information provided to date, the DEC has determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment. No future remedial action is required.his determination is in accordance with 18 AAC 75.380(d) and does not preclude DEC from requiring additional assessment and/or cleanup action if future information indicates that this site may pose an unacceptable risk to human health or the environment. Bruce Wanstall
3/5/2012 Institutional Control Record Established Institutional Controls established and entered into the database. Bruce Wanstall
3/5/2012 350 Determination An area-wide 350 determination restricting installation of water wells, including the Sitka Rocky Gutierrez Airport where the Maintenance Station is located, has been agreed upon by State-owned property managers (including ADOT&PF) on Japonski Island, the City and Borough of Sitka, and the general public. Bruce Wanstall
3/12/2012 Institutional Control Update Project manager changed from Wanstall to IC Unit. Evonne Reese
3/18/2016 Institutional Control Compliance Review IC compliance review conducted. IC reminder letter drafted and scheduled to send out next year as part of this site's five-year review. Kristin Brown
5/18/2017 Institutional Control Compliance Review IC compliance review conducted. ICs Verification letter issued. Reminder system set for future follow-ups to occur every three years. Kristin Brown

Contaminant Information

Name Level Description Media Comments
DRO < Method 2 Most Stringent Soil
GRO < Method 2 Most Stringent Soil
Benzene < Method 2 Most Stringent Soil

Control Type

Type Details
Land Use Plan / Maps / Base Master Plan A deed restriction agreement for future development on properties at the Sitka Airport managed by the ADOT&PF Airport Property Lease Division establishes restriction against accessing groundwater by requiring coordination with the DEC prior to installing any wells. Water and sewer are supplied to the area by the City of Sitka Public Works Department. A letter of agreement to abide by the restriction on installing water wells and commitment to record deed notices for the property when the cleanup process was completed at the formerly used department of defense site on Japonski Island.

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site. Standard condition.
Groundwater Use Restrictions Deed Restriction Agreement pertaining to future development on the Sitka Airport restricts installing water wells at the facility to access ground water that may have contamination in concentration to present a risk to human health or the environment.
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.
Other The monitoring well currently installed at the property must be decommissioned in accordance with ADEC guidance when it is no longer needed.
Periodic Review Every three years.

Missing Location Data

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