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Site Report: Alyeska VMT Ballast Tank 94


Site Name: Alyeska VMT Ballast Tank 94
Address: Valdez Marine Terminal, Dayville Road, Valdez, AK 99686
File Number: 1200.38.002
Hazard ID: 1719
Status: Cleanup Complete
Staff: ,
Latitude: 61.084276
Longitude: -146.382196
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

Alyeska contractors discovered an area with crude oil contaminated soils when replacing the catalytically blown asphalt (CBA) liner in September 1992. Breaches in liner allowed sub-liner soil to become contaminated. Impacted soil above the liner was removed, and in October 1992, impacted soil beneath the liner was removed to the maximum extent practical without compromising the integrity of the tank foundations. A new liner was installed, and the excavation was backfilled with ADEC approval. Tanks 92, 93, & 94 each have a 465,000 bbl (19,530,000 gallon) capacity and share a single, lined secondary containment structure with a 535,900 barrel (22,507,800 gallon) capacity.

Action Information

Action Date Action Description DEC Staff
5/14/1993 Site Added to Database No Longer Assigned
6/1/1993 Update or Other Action June 1993 Workplan 90s Tank Contamination Assessment by America North/Emcon. Keather McLoone
9/1/1993 Update or Other Action September 1993 Workplan Soil Segregation Project (see also file 1200.38.001). Approximately 10,000 cubic yards of contaminated or suspected contaminated soil temporarily stockpiled within the 90's tanks containment cell and in the storage area west of the West Tank Farm. These stockpiled soils originated from soil remediation activities at several locations within the VMT. Plan includes confirmation samples from beneath the stockpiled soil following removal of stockpile. Keather McLoone
12/1/1993 Update or Other Action December 1993 90s Tanks Site Assessment prepared by America North/Emcon. This report states in the Site History section that an assessment was performed in October 1992 which include eleven soil samples collected from above the catalytically blown asphalt (CBA) and 2 samples collected from below the liner in the vicinity of the 90s tanks. Contamination above "ADEC target soil cleanup levels" was found in several samples collected from the subsurface adjacent to Tank 92. These results were presented in America North/Emcon;s March 1993 report entitled "Tank Containment Soil Quality Assessment". The investigation reported in the December 1993 assessment report was a result of this earlier investigation. In 1993, four boreholes were advanced outside the north edge of this tank containment area. Six TRPH (total recoverable) and EPH (diesel) soil samples collected. Only one detected result at 1,300 mg/kg TRPH (in borehole most closely associated with tank 93 - no water noted in this borehole/well). Three boreholes were coverted to groundwater wells. Two water samples collected and analyzed for VPH (gas), EPH, and BTEX compounds. BTEX and VPH results ND. EPH results up to 0.78 mg/L and TRPH 1.9 mg/L. Keather McLoone
1/6/1994 Site Number Identifier Changed Old Reckey 199240011601. Scott Rose
12/29/1995 Update or Other Action Receipt of BWT Tank 92 Soil Sample Results from Emcon. In Background section of this report it is indicated that impacted soils were removed from east end of the 90s Tank area (area nearest Tank 92). Then in 1995, staining and odor were observed on the containment walls east of Tank 92 which resulted in efforts reported under this cover. 330 cubic yards of soil were removed and six confirmation samples and one duplicate collected and analyzed for BTEX, DRO, GRO, and TPH. Only one sample contained a result above 2009 Table B Method Two cleanup levels with 710 mg/kg DRO. Keather McLoone
4/21/1998 Site Ranked Using the AHRM Ranking action added now because it was not added when the site was originally ranked. Bill Petrik
4/21/2000 Site Ranked Using the AHRM SW Exposure Index Value changed from 0.4 to 0. No Longer Assigned
12/5/2000 Site Ranked Using the AHRM Changed Population Density Value from 0 to 5. No Longer Assigned
2/23/2005 Update or Other Action Date of FINAL BWT 90s Tank Liner Investigation Sampling Report by SLR. ADEC approved liner repair was completed in July and August of 2004. In August 2004 SLR staff took three soil samples from the area south of this tank containment area because contamination was identified during the liner repair. Two exceeded the Method 2 cleanup level for migration to groundwater of 230 mg/kg. Sample T-435 contained 491 mg/kg of DRO; and sample T-480 contained 453 mg/kg of DRO. Alyeska staff collected two additional samples at the request of the onsite Joint Pipeline Office representative, on August 10, 2004, neither of them were over the cleanup level for DRO. The extent of contamination could not be determined due to limited access below the liner. ADEC approved proceeding with liner repair project. The ongoing (as of 2008) water quality program includes collection of samples downgradient from this area. Keather McLoone
12/31/2007 GIS Position Updated Verified geographic coordinates. Pam Clemens
12/31/2007 Exposure Tracking Model Ranking Initial ranking with ETM completed. Pam Clemens
5/1/2013 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 72697 Ballast Water Tank #94. All pathways are now Incomplete, Controlled, or De Minimis. Closure review is underway. Richard Bernhardt
5/6/2013 Cleanup Complete Determination Issued Site no longer presents an unacceptable risk to human health or the environment. Richard Bernhardt

Contaminant Information

Name Level Description Media Comments
DRO < Method 2 Most Stringent Soil

Control Type

Type Details
No ICs Required

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.

Missing Location Data

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