Site Report: Haines-Fairbanks Pipeline MP 475.2 - GV59
| Site Name: | Haines-Fairbanks Pipeline MP 475.2 - GV59 |
|---|---|
| Address: | Alaska Highway Mile 1364.5, Haines-Fairbanks Pipeline MP 475.2, Dot Lake, AK 99737 |
| File Number: | 900.38.001 |
| Hazard ID: | 4475 |
| Status: | Cleanup Complete |
| Staff: | No Longer Assigned, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 63.676400 |
| Longitude: | -144.153520 |
| 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
Gate Valve # 59 is located near Dot Lake at Alaska Highway Milepost 1364.5. There were no documented fuel releases at the site, however, Gate Valve #59, along with all other gate valves, was investigated as a possible release location. In 2007, an investigation involving a limited excavation led to the discovery of petroleum contaminated soil. As a result, the gate valve, vault, and approximately 20 cubic yards of contaminated soil near the valve vault were removed. This soil was excavated from the surface to about 8 feet below ground. Three samples were collected from the excavation. The sample from the bottom of the pit exceeded the default 18 Alaska Administrative Code (AAC) 75.341, Table B2 ADEC cleanup level of 250 milligrams per kilogram (mg/kg) for diesel range organics (DRO) having a concentration of 2,200 mg/kg, and 230 mg/kg for gasoline range organics (GRO) having a concentration of 260 mg/kg. No additional contaminants of concern were identified. Supplemental investigations and cleanup activities occurred. Samples collected in 2007 and 2008 show that there is a small volume of GRO and DRO contamination at concentrations above the cleanup level still present near the former gate valve. The extent of the contamination is fairly small and would be difficult to remove due to the proximity of the Alaska Highway. While the concentrations exceed the default cleanup levels based upon contaminant migration from soil to groundwater used as a drinking water source, they are below the ADEC human health exposure pathway concentrations for direct contact or outdoor inhalation. Groundwater monitoring results from wells near and downgradient from the remaining soil contamination have met the cleanup level demonstrating that the petroleum soil contamination does not pose an unacceptable risk to the groundwater at the site.
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 | USACE ROST workplan approved this date. | Anne Marie Palmieri |
| 9/4/2008 | Site Characterization Report Approved | Report covered 2007 activities. 20 cy of contaminated soil was sent to OIT. 3 confirmation samples were collected: highest DRO was 12,000 mg/kg and GRO was 520 mg/kg. | Anne Marie Palmieri |
| 3/5/2009 | Exposure Tracking Model Ranking | Initial ranking with ETM completed for source area id: 75462 name: auto-generated pm edit Haines-Fairbanks Pipeline MP 475.25 | Anne Marie Palmieri |
| 9/29/2010 | CERCLA SI | 2008 ROST SI report approved this date. 15 probes were installed. 2 soil samples were collected with DRO concentrations found up to 1000 mg/kg. Due to difficult drilling conditions, the area could not be fully delineated. Additional investigation will be conducted in 2010-11. | Anne Marie Palmieri |
| 12/20/2012 | CERCLA RI Report Approved | RI approved this date. Report covers GVs 45, 49, 52, and 59. Field work was conducted in 2010-2011. | Anne Marie Palmieri |
| 2/4/2013 | Update or Other Action | project manager changed from Palmieri to Morris | Anne Marie Palmieri |
| 9/24/2013 | Site Characterization Workplan Approved | The ADEC Contaminated Site Program approved the 2013 Final Work Plan Addendum, Gate Valve #59 Haines-Fairbanks Pipeline FUDS Site, Tok, Alaska. | Jessica Morris |
| 5/21/2014 | Site Characterization Report Approved | The ADEC Contaminated Site Program approved the 2014 Final Groundwater Monitoring Report, Gate Valve #59 Haines-Fairbanks Pipeline FUDS Site, Tok, Alaska. The results from the 2013 sampling event indicated that the groundwater contaminant concentrations were below the ADEC cleanup levels. The one groundwater monitoring well (MW4) which had previously shown DRO concentrations above the cleanup level has had declining DRO concentrations during each sampling event. Conclusions in the report state that remaining soil contamination is limited in extent and does not present a continued risk for significant contaminant migration to groundwater. The report included recommendations for site closure and decommissioning monitoring wells. | Jessica Morris |
| 8/21/2015 | Update or Other Action | The ADEC Contaminated Sites Program approved the Gate Valve 59 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 |
| 4/27/2016 | Update or Other Action | Rec'd NDAI this date. | Danielle Duncan |
| 7/6/2016 | Cleanup Complete Determination Issued | Danielle Duncan |
Contaminant Information
| Name | Level Description | Media | Comments |
|---|---|---|---|
| DRO | Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation | Soil | Remaining DRO concentration is 2,200 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.