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Site Report: Alyeska PS 10 Tank 200


Site Name: Alyeska PS 10 Tank 200
Address: Mile 218 Richardson Hwy., Pump Station 10, Paxson, AK 99737
File Number: 330.38.022
Hazard ID: 1726
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 63.424600
Longitude: -145.765500
Horizontal Datum:WGS84

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

Large releases of crude oil in 1980, 1992 and numerous smaller spills within a large diked secondary containment area. No liner and groundwater contamination was suspected.

Action Information

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 Brown
11/6/2013 Update or Other Action Staff changed from Richard Bernhardt to IC Unit. Kristin Brown
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 Brown
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

Contaminant Information

Name Level Description Media Comments
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
GRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
Benzene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
Ethylbenzene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
Toluene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil

Control Type

Type Details
Signed CS Determination
Other Land-use reporting

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.
Excavation / Soil Movement Restrictions Movement or use of contaminated material in a manner that results in a violation of 18 AAC 70 water quality standards is prohibited.
Groundwater Use Restrictions

Missing Location Data

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