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Site Report: Alyeska VMT Catch Basin #15 (formerly known as #2)


Site Name: Alyeska VMT Catch Basin #15 (formerly known as #2)
Address: West Tank Farm, Alyeska Marine Terminal, Valdez, AK 99686
File Number: 1200.38.047
Hazard ID: 2961
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 61.082458
Longitude: -146.398386
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 April 30, 1997, Alyeska identified a crude oil release from the West Tank Farm evident by the accumulation of crude oil into catchment basin #2. The volume of the spill was unknown, but 42 gallons of free product were recovered. Investigations and soil borings identified two broken lines entering the oily water utility manhole (55-MH-2-12) sump near the West Fire Foam Building which feed into catchment #2 (The sump receives oily water from 4 incoming pipelines then exits through a 12-inch oily water sewer line that leads to the ballast water treatment plant). The release from the piping migrated down gradient to the bedrock surface along a retaining wall and out into catchment. Approximately 600 yards of contaminated soil and sandbags were removed from Catchment #2. Catchment #2 is now known as Catchment #15. Note: surface monitoring for this site is being tracked under file# 1200.38.054 Alyeska VMT Baseline Water Quality Monitoring.

Action Information

Action Date Action Description DEC Staff
8/15/1997 Update or Other Action On this date, ADEC received the Corrective Action and Interim Contaminant Assessment Report West Tank Farm Catchment #2 Crude Oil Release Site VMT Alyeska Spill No. 1997052 submitted by Emcon dated August 1997. At catchment #15, 42 gallons of free product were recovered from the catchment pond, and 600 yards of impacted soil and sandbags were removed and stored in the VMT contaminated-soil stockpile area. The excavation was limited by: the rock face on the south side, the west by a vertical support member (VSM), and bedrock initially encountered at 7 feet bgs. Eight confirmation soil samples collected from the excavation did not contain detectable contaminants above ADEC cleanup levels. Two soil samples collected from contaminated soil left under the VSM contained GRO up to 430 mg/kg and DRO at 1,000 mg/kg. Three soil samples collected 5 to 6 feet bgs from five test pits advanced downgradient of the excavation did not contain detectable concentrations of contaminants above cleanup levels. Two soil borings advanced within the excavation contained DRO up to 2,300 mg/kg from a soil sample collected 15 feet bgs at the groundwater interface. The excavation was capped with clean fill. At the west fire foam building, five borings were advanced. Two of these borings located nearest to manhole 55-MH-2-12 contained DRO up to 7,900 mg/kg and GRO up to 370 mg/kg at 17.5 feet bgs and DRO up to 1600 mg/kg, GRO up to 290 mg/kg, and benzene up to 0.16 mg/kg at 20 feet bgs. A visible smear zone was encountered at the bedrock interface at a depth of 22 to 25 feet bgs. Grant Lidren
2/20/1998 Update or Other Action This site was transfered to the CSP from PERP on this date. The PERP spill and case title is: 97229912001 AMT Catchment Basin #2 Grant Lidren
4/28/1998 Site Added to Database Crude oil release. Bob Krogseng
4/28/1998 Site Characterization Workplan Approved (Old R:Base Action Code = SA1A - Phase I Site Assessment Approval). A site assessment was approved. Bob Krogseng
7/14/1999 Update or Other Action On this date, ADEC received the Corrective Action and Interim Contaminant Assessment Report West Tank Farm Catchment #2 Crude Oil Release Site VMT Alyeska Spill No. 1997052 submitted by Emcon dated June 1999. Soil was excavated to a depth of 12 feet bgs to repair the oily water sewer lines. Three soil samples collected from visually contaminated soil at the depths of the excavation contained DRO up to 6,100 mg/kg, and benzene up to 0.32 mg/kg. Three soil borings advanced within the excavation contained DRO up to 7,400 mg/kg at 17.5 feet bgs and DRO up to 2,600 mg/kg at a depth of 20 feet bgs. Bedrock was encountered at 21 feet bgs. Grant Lidren
3/28/2000 Update or Other Action On this date, ADEC received the 1999 Annual Surface Water Monitoring Report Catchment No. 2 submitted by Emcon dated January 25, 2000. Surface water samples were collected from four locations in June, July, September, and October 1999. These included: a CMP outfall extending under the West tank farm and Utility hole 55-MH-2-12; the outfall of Catchment No. 2; and two springs located down gradient of Catchment No. 2. DRO and RRO were detected below cleanup levels in the outfall of Catchment No. 2 and from one of the springs. These results were similar to previous surface water sampling results in 1997 and 1998. Grant Lidren
1/9/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Pam Clemens
4/9/2014 Cleanup Complete Determination Issued The Alaska Department of Environmental Conservation (ADEC), Contaminated Sites Program, has completed a review of the environmental records associated with the Alyeska VMT Catch Basin #15 (formerly known as #2). Based on the information provided to date and the administrative record, the ADEC has determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment. No further remedial action will be required as long as the site is in compliance with established institutional controls. Grant Lidren
4/9/2014 Institutional Control Record Established Institutional Controls established and entered into the database. Grant Lidren
5/9/2014 Update or Other Action On this date, ADEC received the signed CC-IC agreement from Alyeska. Grant Lidren
11/23/2015 Institutional Control Compliance Review IC compliance review conducted, staff changed from Lidren to IC unit, and reminder system set to review the site record in April 2019. The IC requirement of monitoring of surface water is managed under the site record file number 1200.38.054. I set the reminder system to verify that the yearly monitoring report is being received every two years. Nathan Maxwell

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

Control Type

Type Details
Signed CS Determination

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.
When Contaminated Soil is Accessible, Remediation Should Occur
Groundwater Use Restrictions
Surface water monitoring Catchment 15

Missing Location Data

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