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Site Report: ADOT&PF Birchwood Maintenance Station Class V Injection Well


Site Name: ADOT&PF Birchwood Maintenance Station Class V Injection Well
Address: 20651 Birchwood Spur Road; Birchwood Airport, Chugiak, AK 99567
File Number: 2106.38.011
Hazard ID: 26242
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 61.421698
Longitude: -149.496994
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 Alaska Department of Transportation & Public Facilities (ADOT&PF) Birchwood Maintenance Station at the Birchwood airport in Chugiak was constructed sometime around the 1980s and was outfitted with seven floor drains, all of which connected to a Class V Injection Well. The well and surrounding soils were excavated in October of 2013. Confirmation soil samples indicated that diesel range organics (DRO), residual range organics (RRO), chromium, and arsenic remain in the sub-surface soils above Alaska Department of Environmental Conservation (ADEC) cleanup criteria.

Action Information

Action Date Action Description DEC Staff
6/19/2014 Site Added to Database A new site has been added to the database Mitzi Read
6/23/2014 Report or Workplan Review - Other The Contaminated Sites Program (CSP) completed its review of the Class V Injection Well Sampling report for the Birchwood Maintenance Station, dated May 31, 2013. A subsurface soil investigation was performed on March 25, 2013 to identify types of contamination associated with the Class V well. Five borings were advanced in the vicinity of the well, ranging in depths from 7.5 to 25 feet below ground surface (bgs). One analytical soil samples was collected from 24.5 feet bgs, roughly 9 feet below the Class V well base, and was analyzed for Resource Conservation and Recovery Act (RCRA) metals, semi-organic volatile organic compounds (SVOCs), and volatile organic compounds (VOCs). Chromium was the only contaminant detected above the ADEC cleanup level; however, at a concentration typically seen in Alaskan soils. VOCs were also present at concentrations below applicable ADEC cleanup criteria. Joshua Barsis
6/23/2014 Report or Workplan Review - Other The CSP completed its review of the Class V Injection Well Closure Report for the Birchwood Maintenance Station, dated November 19, 2013. In October of 2013, the Class V well and its associated piping (up to the building foundation) were removed from the ground. During the removal activities, roughly 300 to 350 cubic yards (cy) of impacted soils were excavated and stockpiled onsite. Confirmation soil samples were collected from the base and sidewalls of the excavation and were analyzed for gasoline range organics (GRO), diesel range organics (DRO), residual range organics (RRO), VOCs, SVOCs, and RCRA metals. Soil samples collected from the northern portion of the excavation exhibited concentrations of DRO up to 4,970 mg/kg, RRO up to 12,400 mg/kg, arsenic up to 4.5 mg/kg, and chromium up to 53.3 mg/kg; all of which exceed the ADEC cleanup criteria. The concentrations of arsenic and chromium are typical of Alaskan soils and are considered background concentrations. None of the other samples collected from the excavation exhibited contaminants above ADEC cleanup criteria (except for arsenic and chromium). Because of a buried electrical line, septic system, and fence, additional excavation in the northern portion of the excavation was not feasible during these field activities. Prior to backfilling, a new wastewater holding tank was placed in the excavation to replace the former Class V well. The contaminated soil stockpiles and drums of water still need to be treated or disposed of offsite. Joshua Barsis
6/23/2014 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79637 name: Class V Injection Well Joshua Barsis
1/15/2015 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79637 Class V Injection Well. Joshua Barsis
2/12/2015 Cleanup Complete Determination Issued Petroleum contamination remains in sub-surface soil above ADEC cleanup levels; however ADEC has determined there is no unacceptable risk to human health or the environment as long as the contamination is properly managed. See file for more information. Joshua Barsis
2/13/2015 Institutional Control Record Established Institutional Controls established and entered into the database. Joshua Barsis
9/30/2016 Institutional Control Compliance Review IC compliance review conducted. Staff changed from Joshua Barsis to IC Unit. IC/Closure details added. IC reminder letter issued requesting the signed ICs Agreement and Signature Page. Reminder system set to follow-up on the ICs Agreement Page in one month, and on land use conditions every five years. Kristin Brown
10/10/2016 Institutional Control Update I talked to an ADOT representative about the CS Agreement. ADOT is aware of the ongoing conditions (ICs) on this property and agrees to them. I told the representative that I would note this and that they did not need to sign the agreement. Evonne Reese

Contaminant Information

Name Level Description Media Comments
DRO 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

Control Type

Type Details
Signed CS Determination ADOT&PF is aware of the ongoing conditions (ICs) on this property and agrees to them.

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)
Periodic Review ADOT&PF must report to ADEC every five (5) years to document land use, or report as soon as ADOT&PF becomes aware of any change in land ownership and/or use, if earlier.
Groundwater Use Restrictions Installation of groundwater wells requires ADEC approval.
When Contaminated Soil is Accessible, Remediation Should Occur Sub-surface soil contamination remains in the northern portion of the excavation. When the soil becomes accessible, the soil must be evaluated and addressed to the satisfaction of ADEC.

Missing Location Data

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