| Action Date |
Action |
Description |
DEC Staff |
| 9/10/1993 |
Preliminary Assessment Approved |
(Old R:Base Action Code = SA2R - Phase II SA Review (CS)). Crude oil discovered under the liner to a depth of at least 3 feet. Assessment to install 3 borings to a depth of approximately 30 feet to determine the vertical extent of contamiantion. |
Mehrdad Nadem |
| 9/20/1993 |
Update or Other Action |
7 borings were drilled from September 11-13. One boring showed contamination to a depth of 30 feet. Preliminary data ranged from 16,950 ppm TPH at surface to 800 ppm TPH at 30 feet. Turbine fuel contamiantion also found. Soil excavated to 12 feet but stopped due to safety concerns. Six additional borings to be installed. |
Mehrdad Nadem |
| 1/5/1994 |
Cleanup Level(s) Approved |
(Old R:Base Action Code = RARR - Remedial Action Report Review (CS)). Final corrective action report reviewed by staff. Level A cleanup required. Contamination identified in excess of cleanup criteria include benzene, BTEX, DRO, GRO and residual range hydrocarbons. MW B-7 contains 1.4 ppm TPH. Additional borings and MWs requested by department. |
Scott Rose |
| 1/5/1994 |
Site Added to Database |
|
Scott Rose |
| 6/2/1994 |
Site Characterization Workplan Approved |
(Old R:Base Action Code = SA2R - Phase II SA Review (CS)). Monitoring Well installation plan reviewed and approved. Three additional wells were proposed to determine GW flow directions. |
Scott Rose |
| 1/19/1995 |
Update or Other Action |
Date of Tank 200 Groundwater Monitoring Report Pump Station 10. Three borings were advanced and completed as monitoring wells. Soil samples collected did not exceed the most conservative of Method Two cleanup levels for BTEX, GRO, DRO, and RRO. Groundwater samples were collected in September 1993 and June 1994 and did not exceed Table C levels for BTEX. Three samples had detectable levels of TRPH in September of 1993. The lowest level TRPH well was not resampled in June 1994 but the other two were then ND for TRPH. |
Keather McLoone |
| 8/2/1995 |
Cleanup Plan Approved |
(Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Bioventing System Design reviewed and found to be deficient in several areas. Additional data requested by the department. The conceptual approach was approved by the department. |
Scott Rose |
| 10/23/1995 |
Site Ranked Using the AHRM |
Initial ranking. |
Scott Rose |
| 12/21/1995 |
Update or Other Action |
Received Summary of Analytical Results: Pump Station 10 Tank 200, Annual Groundwater Monitoring Report. No detectable petroleum hydrocarbons in wells containing sufficient water for sampling. |
Keather McLoone |
| 4/9/2003 |
Update or Other Action |
Received PS 10 Monitoring Point Installation Report. Alyeska advanced two soil borings near Tank 200 - one of which was converted into a soil vapor monitoring point. The soil borings were originally suppose to be located where the highest levels of contamination were located. Unfortunately, the borings are five feet from the proposed locations. All soil samples collected from these borings showed non-detect for GRO, DRO, RRO and BTEX. The conclusions from the report were that the soil vapor samples indicate that some residual hydrocarbons may be present in the soil in the vicinity of the monitoring points. However, high levels of oxygen, coupled with the low carbon dioxide levels, indicate that significant degradation is not occurring at this time. |
Deborah Williams |
| 12/28/2007 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed. |
Keather McLoone |
| 3/14/2008 |
Update or Other Action |
Received Trans Alaska Pipeline System: 2007 Monitoring Well Decommissioning Report. Five remaining monitoring wells at this site were all successfully located and decommissioned. |
Keather McLoone |
| 3/4/2009 |
Conceptual Site Model Submitted |
Receipt of Pump Station 10 Tank 200 Conceptual Site Model by SLR. This was prepared to support the request for a conditional site closure. |
Keather McLoone |
| 3/11/2009 |
Institutional Control Record Established |
Landuse restrictions and landuse reporting |
Keather McLoone |
| 3/11/2009 |
Cleanup Complete Determination Issued |
The ADEC has determined there is no unacceptable risk to human health or the environment, and this site will be granted a Cleanup Complete- ICs determination subject to the following.
1. Any future change in land use may impact the exposure assumptions cited in this document. If land use and/or ownership changes, current ICs may not be protective and ADEC may require additional remediation and/or ICs. Therefore the Alyeska Pipeline Service Company shall report to ADEC every five years to document land use, or report as soon as Alyeska Pipeline Service Company becomes aware of any change in land ownership and/or use, if earlier. The report can be sent to the local ADEC office or electronically to DEC.ICUnit@alaska.gov.
2. Installation of groundwater wells will require approval from ADEC in accordance with 18 AAC 75.350(2).
3. Any proposal to transport soil or groundwater off site requires ADEC approval in accordance with 18 AAC 75.325 (i). A “site” [as defined by 18 AAC 75.990 (115)] means an area that is contaminated, including areas contaminated by the migration of hazardous substances from a source area, regardless of property ownership. (See attached site figure.)
4. Movement or use of contaminated material in a manner that results in a violation of 18 AAC 70 water quality standards is prohibited.
|
Keather McLoone |
| 12/1/2011 |
Update or Other Action |
The current project manager chose to retain management of this site with the Cleanup Complete Determination that has Institutional Controls. |
Kristin Thompson |
| 11/6/2013 |
Update or Other Action |
Staff changed from Richard Bernhardt to IC Unit. |
Kristin Thompson |
| 11/19/2013 |
Institutional Control Compliance Review |
IC review conducted. Task Tracker set to document the need for an IC reminder letter every five years. |
Evonne Reese |
| 5/14/2014 |
Institutional Control Update |
An IC reminder letter was issued to the responsible party on this date. |
Kristin Thompson |
| 11/20/2017 |
Meeting or Teleconference Held |
Attended a meeting regarding the elimination of non-essential infrastructure at Pump Station 10. There are five Alyeska sites located at this pump station that have institutional controls and this site is one of them. Construction is in the planning stages and will not begin until 2019. The foundations for the buildings on the pad will remain in place so the residual contamination that may remain underneath the foundations will remain in place. Because of this, the project is not planning on addressing the known contaminated site issues. Verifying this detail should be included in the next IC compliance review. |
Evonne Reese |
| 3/11/2019 |
Institutional Control Compliance Review |
IC verification letter from Alyeska received this date. The letter confirms that there have been no changes in land use and that IC requirements are being complied with. The next IC review will be in five years time. |
Evonne Reese |
| 2/6/2020 |
Institutional Control Update |
Received confirmation from Alyeska that the 2019 work to decommission this pump station has been completed. Most of the buildings, and structures (such as the tank farm tanks), have been removed but land use at the site has not changed. Alyeska still has some infrastructure on site and will maintain security around the property. There are no changes to the ICs on the property.
|
Evonne Reese |
