Site Report: Haines-Fairbanks Pipeline MP 585.5 - GV69
| Site Name: | Haines-Fairbanks Pipeline MP 585.5 - GV69 |
|---|---|
| Address: | Richardson Highway Mile 322.5, Salcha River Campground, Salcha, AK 99714 |
| File Number: | 900.38.001 |
| Hazard ID: | 4485 |
| Status: | Cleanup Complete |
| Staff: | No Longer Assigned, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 64.469200 |
| Longitude: | -146.927540 |
| Horizontal Datum: | NAD83 |
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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
Location of Gate Valve #69. The Corps of Engineers has identified the most likely locations where petroleum contamination might be present, including: 1) valves, 2) locations of documented spills, 3) locations where contamination has been noted by local residents or other persons, and 4) scraper traps and pump stations. These locations were the basis for the Site Investigations that were conducted in order to determine if petroleum contamination is present along the pipeline. Although there were no documented releases at the site, a previous investigation in 2007 had identified petroleum contamination in subsurface soil near the valve vault. There was no evidence of surface soil contamination. The valve vault, valve, and bleeder valve were removed in 2007. The bottom of the gate valve was about 5 feet below ground surface, but the excavation continued until groundwater was encountered at about 8 feet below ground surface. A soil sample collected from the bottom of the excavation at 8 feet below ground surface (the groundwater interface) indicated that gasoline range (GRO) and diesel range organics (DRO) contamination was present at 480 and 1,700 mg/kg respectively. In April 2014, ten soil borings were completed using a Geoprobe drill rig and twenty-one soil samples were collected from the locations of the former gate and bleeder valves and from varying distances from them beginning from about 7 feet below ground surface and continuing to about twenty feet below ground surface. Of these soil borings, only one had diesel range organics contamination exceeding the ADEC Method Two cleanup level for migration to groundwater for the under 40-inch zone of 250 mg/kg. This boring had a concentration of 540 mg/kg collected from 9 feet below ground surface. Six groundwater monitoring wells were installed and samples collected from them did not detect contaminants of concern in concentrations greater than Table C groundwater cleanup levels. These analytical results indicate that remaining petroleum contamination is located at depth, is of de Minimis volume and will naturally attenuate over time.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 7/17/2007 | Site Characterization Workplan Approved | Workplan approved this date. | Anne Marie Palmieri |
| 10/22/2007 | Site Added to Database | Site added to the database. | Mitzi Read |
| 4/29/2008 | Site Characterization Workplan Approved | Workplan approved this date. | Anne Marie Palmieri |
| 9/4/2008 | Site Characterization Report Approved | Report covering 2007 activities approved. Valve and vault were removed and groundwater was found at 3' bgs. No contamination found associated with the vault, but contamination found in the area. DRO = 1700 mg/kg and GRO = 480 mg/kg. Additional investigation needed to determine source location. | Anne Marie Palmieri |
| 3/6/2009 | Exposure Tracking Model Ranking | Initial ranking with ETM completed for source area id: 75472 name: auto-generated pm edit Haines-Fairbanks Pipeline MP 585.5 | Anne Marie Palmieri |
| 9/29/2010 | CERCLA SI | 2008 ROST SI report approved this date. 14 probes were installed and one soil sample was collected. Analytical results showed exceedences for DRO (2900 mg/kg), GRO (1800 mg/kg) and arsenic (7.1 mg/kg). Additional investigation will be conducted in 2010-11. | Anne Marie Palmieri |
| 2/4/2013 | Update or Other Action | project manager changed from Palmieri to Morris. | Anne Marie Palmieri |
| 4/8/2014 | Site Characterization Workplan Approved | ADEC Contaminated Sites Program approved the 2014 Work Plan for Environmental Investigation at Gate Valve #69, Haines-Fairbanks Pipeline FUDS, Salcha, Alaska. | Jessica Morris |
| 10/23/2014 | Site Characterization Report Approved | The ADEC Contaminated Sites Program approved the 2014 Environmental Investigation Report at Gate Valve #69, Haines-Fairbanks Pipeline FUDS, Salcha, Alaska. DRO concentrations were detected in only one subsurface soil sample at the location of the former bleeder valve. The concentration was below the ADEC inhalation and ingestion cleanup levels, but exceeded the migration to groundwater cleanup level. The samples collected below this DRO exceedance were less than the migration to groundwater cleanup level. Groundwater contamination was not identified in the six monitoring wells installed at the site. Site closure and decommissioning of the monitoring wells was recommended. | Jessica Morris |
| 10/23/2014 | Exposure Tracking Model Ranking | A new updated ranking with ETM has been completed for source area 75472 auto-generated pm edit Haines-Fairbanks Pipeline MP 585.5. | Jessica Morris |
| 9/2/2015 | Update or Other Action | The ADEC Contaminated Sites Program approved the Gate Valve 69 Well Decommissioning Tech Memo. | Jessica Morris |
| 12/17/2015 | Update or Other Action | Staff changed to Danielle Duncan and hard file transferred to the Juneau office. | Kristin Thompson |
| 4/19/2016 | Update or Other Action | Rec'd No Department of Defense Action Indicated Report via electronic mail this date. | Danielle Duncan |
| 5/16/2016 | Update or Other Action | At Gate Valve 69, no surface staining was present, however, a previous investigation in 2007 had identified petroleum contamination in subsurface soil near the valve vault. The valve vault, valve, and bleeder valve were removed in 2007. The bottom of the gate valve was about 5 feet below ground surface, but the excavation continued until groundwater was encountered at about 8 feet below ground surface. A soil sample collected from the bottom of the excavation at 8 feet below ground surface (the groundwater interface) indicated that gasoline range (GRO) and diesel range organics (DRO) contamination was present at 480 and 1,700 mg/kg respectively. In April 2014, ten soil borings were completed using a Geoprobe drill rig and twenty-one soil samples were collected from the locations of the former gate and bleeder valves and from varying distances from them beginning from about 7 feet below ground surface and continuing to about twenty feet below ground surface. Of these soil borings, only one had diesel range organics contamination exceeding the ADEC Method Two cleanup level for migration to groundwater for the under 40-inch zone of 250 mg/kg. This boring had a concentration of 540 mg/kg collected from 9 feet below ground surface. Six groundwater monitoring wells were installed and samples collected from them did not detect contaminants of concern in concentrations greater than Table C groundwater cleanup levels. These analytical results indicate that the remaining petroleum contamination is located at depth within the road bed, is of de minimis volume, and will naturally attenuate over time. Therefore, the ADEC concurs with the United States Army Corps of Engineers in their determination that no further action is required at the Gate Valve 69 site and the site status will be changed to Cleanup Complete in the ADEC Contaminated Sites Database per 18 AAC 75.380. | Danielle Duncan |
| 5/16/2016 | Cleanup Complete Determination Issued | Danielle Duncan | |
| 5/16/2016 | Exposure Tracking Model Ranking | A new updated ranking with ETM has been completed for source area 75472 auto-generated pm edit Haines-Fairbanks Pipeline MP 585.5. | Danielle Duncan |
Contaminant Information
| Name | Level Description | Media | Comments |
|---|---|---|---|
| DRO | Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation | Soil | Remaining DRO in soil is at about 7 feet below ground surface and is 540 mg/kg. |
Control Type
| Type | Details |
|---|---|
| No ICs Required |
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) |
No associated sites were found.