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Site Report: Alyeska PS 01 Tank 111


Site Name: Alyeska PS 01 Tank 111
Address: Spine Road, Pipeline Mile 0, Deadhorse, AK 99734
File Number: 330.38.033
Hazard ID: 1173
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 70.257500
Longitude: -148.624500
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

On November 23, 1990, crude oil was observed entering into a service vault located along the west side of Tank 111. The contents of Tank 111 was emptied and after inspection corrosion was evident on the annular ring and base plate of the tank. Holes in the tank's floor were observed to be between 0.5 to 2 inches in dimension. Visually contaminated soil was excavated where the structural integrity of the tank was not compromised. The remaining areas of contamination were the following: 1- Between seams in the blueboard under the tank floor, 2- Under the vault, and 3- one small pocket of oil on the north side of the vault excavation.

Action Information

Action Date Action Description DEC Staff
6/12/1991 Update or Other Action Simon Mawson issued a NFRAP for this site. ADEC states that there are three areas remaining where minor amounts of contaminated material remain. These are some of the seams of the lapped 3" polystyrene foundation insulation, under the vault area and on the north side of the vault excavation. ADEC agreed that the risk to the integrity of the tank and pad of removing the contamination outweighs the benefits of removing the foundation material. Deborah Williams
1/22/2001 Site Added to Database Crude oil contamination. Bruce Wanstall
1/22/2001 Site Ranked Using the AHRM Preliminary ranking. Deborah Williams
3/14/2005 Update or Other Action ADEC received SLR PS 1 Tank 111 Investigation report. Ten soil borings were advanced in the PS1 Tank 111 area. Soil field screening and analytical results indicated that soil adjacent to Tank 111 is impacted with petroleum hydrocarbon constituents. Results from two of the ten soil sample locations exceeded ADEC Method 1 cleanup levels for DRO (B7-0.8 and B8-1.5) and RRO (B7-0.8). Groundwater and surface water samples collected between Tank 111 and the margin of the gravel pad did not contain concentrations of petroleum hydrocarbons above ADEC groundwater cleanup levels. Napthalene, DRO and RRO were detected in the groundwater samples. No petroleum hydrocarbon constituents were detected in surface water samples. Deborah Williams
4/5/2006 Update or Other Action ADEC received the PS 1 Tank 111 Area, Water Quality Monitoring Report, 2005. Groundwater and surface water samples collected between Tank 111 and the margin of the gravel pad did not contain concentrations of petroleum hydrocarbons above ADEC groundwater cleanup levels. Naphthalene, DRO, and RRO were detected in the groundwater samples. No petroleum hydrocarbon constituents were detected in surface water samples. These results are similar to results from the 2004 site investigation, indicating stability in the groundwater plume. SLR recommends continued groundwater and surface water sampling. Deborah Williams
3/14/2007 Update or Other Action ADEC received the SLR report entitled PS 1 Tank 111 2006 Groundwater Monitoring Report. According to the report, ground and surface water samples collected between Tank 111 and the margin of the gravel pad did not contain concentrations of petroleum hydrocarbons above ADEC cleanup levels. DRO and RRO were detected in ground water samples from MW-1, MW-2 and MW-4. Naphthalene was detected in MW-4. Deborah Williams
3/19/2007 Exposure Tracking Model Ranking Initial ranking completed. Deborah Williams
3/7/2008 Update or Other Action Receipt of Pump Station 1 Tank 111 2007 Water Monitoring Report. Four groundwater samples were collected and further support plume stability with some concentrations decreasing. Two surface water locations were sampled - with results less than TAqH and TAH standards. SLR recommends discontinuing monitoring and APSC requests a conditional closure. Report review including laboratory QA/QC performed 3/26/08. Keather McLoone
4/29/2008 Conditional Closure Approved The Alaska Department of Environmental Conservation (ADEC), Contaminated Sites Program, reviewed the environmental records associated with site Pump Station 1 Tank 111. 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 Pump Station 1 Tank 111 can be closed subject to the conditions outlined in this document. The hazardous substance contamination has been adequately addressed and does not pose an unacceptable risk to human health or the environment. Keather McLoone
4/29/2008 Institutional Control Record Established There is contamination remaining above established cleanup levels at Alyeska Pump Station 01 Tank 111 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. Any proposal to transport soil off site requires ADEC approval in accordance with 18 AAC 75.370 (b) Keather McLoone
2/12/2009 Update or Other Action Conceptual Site Model received to support previous request for a conditional closure. Conclusions support that status change. 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
11/10/2013 Update or Other Action Staff changed from Linda Nuechterlein to IC Unit. Kristin Brown
11/19/2013 Institutional Control Compliance Review IC review conducted. Task Tracker documented to send an IC reminder letter to RP. Evonne Reese
5/14/2014 Institutional Control Update An IC reminder letter was issued to the responsible party on this date. Kristin Brown
11/6/2014 Institutional Control Update Responsible party responded to IC reminder letter indicating the site is in compliance with established institutional controls. Off-site soil has not been transported from the site and no such action is planned. Kristin Brown

Contaminant Information

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

Control Type

Type Details
CS Database Notation And Letter To Landowner/RP

Requirements

Description Details
Excavation / Soil Movement Restrictions

Missing Location Data

Because the GIS location data for this site has not been entered, we cannot direct you to its position on the map. Click "Continue" to proceed to the Contaminated Sites Web Map or "Close" to return to the site report.
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