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 |
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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 | Document, Report, or Work plan 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 | Document, Report, or Work plan 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 Thompson |
| 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 |
| 12/18/2019 | Institutional Control Compliance Review | An Institutional Controls reminder letter e-mailed to the landowner/responsible party on this date. | Mossy Mead |
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. |
| Hazard ID | Site Name | File Number |
|---|---|---|
| 24641 | ADOTPF - Chugiak Volunteer Fire Station | 2106.26.014 |