| Action Date |
Action |
Description |
DEC Staff |
| 8/31/1994 |
Update or Other Action |
(Old R:Base Action Code = SI - Site Investigation). Contamination observed along perimeter of pit. 13 soil samples collected. DRO ranged from 14 - 35,000 mg/kg. GRO up to 1900 mg/kg. Benzene up to 1.7 mg/kg. One surface water sample adjacent to pit had BTEX, GRO, and DRO below the MRLs. |
Scott Rose |
| 3/20/1996 |
Update or Other Action |
(Old R:Base Action Code = CORR - Correspondence (General)). Staff met with BP staff to discuss remedial actions. The Milne Point Unit will shut down for approximately 10 days in late March, 1996. This will allow for safe excavation of relief pit. BP submitted a Corrective action work plan for review. |
Scott Rose |
| 3/20/1996 |
Update or Other Action |
(Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Excavation workplan submitted on 3/20/96. Due to field shutdown scheduled for next week, review was accelerated. Approved with stipulations on sample site selection, and soil stockpiling. |
Scott Rose |
| 3/24/1996 |
Site Added to Database |
site added to database after meeting to discuss remedial actions |
Scott Rose |
| 3/24/1996 |
Site Ranked Using the AHRM |
ranked on 3/24/96 |
Scott Rose |
| 5/23/2005 |
Meeting or Teleconference Held |
Meeting to discuss site status & proposed sampling for 2005. |
Linda Nuechterlein |
| 6/3/2005 |
Update or Other Action |
Reviewed Oasis proposal and sent email to BP. |
Linda Nuechterlein |
| 6/22/2006 |
Update or Other Action |
Unlined relief pit is currently inactive. Excavation of visible crude oil contamination conducted in 1996, resulting in 825 CY of material removed, however confirmation sampling indicated areas of contamination remained. In 2005, 3 off pad surface water samples, 2 surface water samples from he relief pit, and 3 sediment samples from the pit floor were collected. No sheen or odor was noted at the off pad sampling locations. DRO, GRO, BTEX, and glycols were not detected in off pad surface water samples. Sheen was observed at the waters surface when sediment was disturbed for sampling at 9 of 11 sampling locations. Black stained material was present on the top 2-3 inches of pit floor sediments. Sediment samples contained DRO up to 56.4 mg/kg, GRO up to 2.42 mg/kg, and benzene up to 0.03 mg/kg. Suspicious of low petroleum concentrations, OASIS requested return of sample containers and verified that the results were correct. DRO was detected in pit surface water up to 0.404 mg/l, BTEX was not detected. Report concludes that sediment samples submitted to the lab were likely from below the stained, odorous layer in the top 2-3 inches of the pit floor and recommended additional sampling to verify this hypothesis. |
Bill O'Connell |
| 7/26/2006 |
Update or Other Action |
Site visit conducted this date. |
Bill O'Connell |
| 3/22/2007 |
Exposure Tracking Model Ranking |
|
Bill O'Connell |
| 8/17/2007 |
Site Characterization Workplan Approved |
Recieved work plan for MPU CFP Unlined relief pit for 2007. Three locations along the centerline of the pit will be sampled, with two samples collected from each location, one from the top 3-4 inches of impacted sediment and one from below this interval. Samples will be analyzed for DRO, GRO, RRO, BTEX, PAHs, and Glycols. |
Bill O'Connell |
| 1/11/2008 |
GIS Position Updated |
Updated with Topozone |
Grant Lidren |
| 4/29/2008 |
Conditional Closure Approved |
The Alaska Department of Environmental Conservation, Contaminated Sites Program (ADEC) reviewed the environmental records associated with BPX Milne Point Unit (MPU) Central Facilities Pad (CFP) Unlined Relief Pit. This site had been contaminated by the release of a hazardous substance; however, based on the information provided to date, ADEC has determined that no further remedial action is required, and that the MPU CFP Unlined Relief Pit can be closed subject to the conditions outlined in the record of decision. The hazardous substance contamination has been adequately addressed and does not pose an unacceptable risk to human health or the environment. This site is included on the Existing (Contaminated) Sites Charter for the Development of the Alaska North Slope (Paragraph II.A.3; Exhibit D.2). |
Bill O'Connell |
| 4/29/2008 |
Institutional Control Record Established |
There is contamination remaining above established cleanup levels at BPX MPU CFP Unlined Relief Pit, but ADEC has determined there is no unacceptable risk to human health or the environment, and this site will be conditionally closed.
This decision is subject to the following conditions:
1. A Notice of Environmental Contamination will be recorded on the ADEC database to document that there is residual contamination remaining on site above the most stringent ADEC cleanup levels;
2. When the relief pit is decommissioned, contaminated material must be removed and disposed of in accordance with ADEC guidance.
3. Any proposal to transport soil off site requires ADEC approval in accordance with 18 AAC 75.370 (b)
This determination is in accordance with 18 AAC 75.380 (d) and does not preclude ADEC 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.
Site closure (without conditions) can be achieved when soil sampling confirms that all soil meets the most stringent ADEC cleanup levels.
|
Bill O'Connell |
| 4/29/2008 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed. |
Bill O'Connell |
| 6/17/2008 |
Site Characterization Report Approved |
Received 2007 monitoring report for MPU CFP Unlined Relief Pit. Three sediment samples were collected at the same locations sampled in 2005. DRO was detected up to 98.2 mg/kg and RRO up to 110 mg/kg. Benzene was also detected up to 0.0505 mg/kg. |
Bill O'Connell |
| 6/12/2012 |
Institutional Control Compliance Review |
An IC review was conducted on this site, reminder system set up to address relief pit decommissioning, and the staff assigned was changed from Bill O'Connell to IC Unit. |
Evonne Reese |
| 12/4/2013 |
Institutional Control Update |
An IC reminder letter was issued to the responsible party on this date. |
Kristin Thompson |
| 12/12/2013 |
Institutional Control Update |
Received a letter from the responsible party in response to ADEC's issued IC reminder letter. Site conditions and current land use remain the same since conditional closure approval in 2008. The relief pit has not been decommissioned and therefore no contaminated material has been removed from the site. Currently, there are no plans to decommission the relief pit. The pit is periodically dewatered and the water that is removed gets disposed of by down-hole injection. Reminder system set up to follow-up again in five years time. |
Kristin Thompson |
| 12/4/2014 |
Update or Other Action |
Staff name changed from IC Unit to McLoone. |
Evonne Reese |
| 11/20/2015 |
Potentially Responsible Party/State Interest Letter |
Sent to Hilcorp due to the asset transfer from BPX. |
Keather McLoone |
| 9/28/2016 |
Update or Other Action |
At this time, the project manager chooses to retain management of this site which has institutional controls. |
IC Unit |
