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Site Report: Former National Bank of Alaska - Benson

Site Name: Former National Bank of Alaska - Benson
Address: 1500 West Benson Boulevard, Anchorage, AK 99503
File Number: 2100.26.316
Hazard ID: 23108
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 61.193100
Longitude: -149.912400
Horizontal Datum:NAD83

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

One 700 gallon diesel underground storage tank (UST #1) was removed in 1995. Diesel contamination is believed to have originated from supply lines from tank to day tank inside the building. Remaining contamination in place is 2,150 mg/kg EPH at 8.5 feet on east wall, north corner. Contamination has migrated beneath building foundation and additional excavation may threaten structural integrity of the building. Tank was located adjacent to the building southwest of the drive-through lanes.

Action Information

Action Date Action Description DEC Staff
7/13/1995 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77964 DRO contamination. Bill Petrik
7/13/1995 Site Added to Database Former Staff
7/26/1995 Leaking Underground Storage Tank Corrective Action Underway On 7/21/95 ADEC approved of contaminated soils to be disposed of at the Anchorage Regional Landfill. On 7/26/95, 38.13 tons of contaminated soil was disposed of. Composite sampling indicated the concentration was less than 1,000 mg/kg. MOA authorization letter and landfill receipts are in Appendix D of the S&S Engineering report "Underground Storage Tank Removal and Release Investigation" dated July 1995. Tim Stevens
7/26/1995 Leaking Underground Storage Tank Cleanup Initiated - Petroleum I entered this backdated action on 7/19/07 based on the fact that contaminated soil was excavated and disposed of this date at the Anchorage Regional Landfill. Bill Janes
12/23/1996 Update or Other Action Received a copy of the S&S Engineering report "National Bank of Alaska; Lot 4A; Tract A2; Alaska Mutual Subdivision; 1500 West Benson Blvd., Anchorage". Lynne Bush
4/23/2003 Update or Other Action Site initially entered on the CSP Database and ranked using the AHRM by Elizabeth Stergiou. Elizabeth Stergiou
6/28/2005 Underground Storage Tank Site Characterization or Assessment Reviewed a copy of the S&S Engineering "National Bank of Alaska, 1500 West Benson, Initial Water Samples" dated September 1995, received by the department on 10/20/95. Two monitoring wells were installed: MW1 to the southwest (30 feet) and MW2 to the south (100 feet) of the UST. They were sampled on 9/26/95 and had 0.277 mg/l DRO in MW1 and 0.202 mg/l DRO in MW2. Groundwater was encountered at 8 feet below ground surface. Soil samples were collected near the soil/water interface, MW1 had 39.5 mg/kg DRO and MW2 has 37.2 mg/kg DRO. Robert Weimer
3/14/2006 Update or Other Action Staff changed from Sundet to Petrik. Bill Petrik
11/27/2006 Update or Other Action Site data transferred from the CSP to the LUST DB. Formerly file number 2100.38.070. Updated erroneous latitude and longitude using TopoZone Pro. Latitude and longitude data gathered from TopoZone Pro Hi-Res Urban Aerial Photo, Large Size Map, 1:2,952 Scale, No Topo Base Map, NAD 83 in conjunction with Anchorage Area Atlas and figure S&S Engineering "Contaminated Site Located at 1500 West Benson (National Bank of Alaska)" dated 8/1/95. High degree of confidence in accuracy of coordinates. They could only be improved using an on-site GPS. Bill Petrik
11/29/2006 Update or Other Action File number reassigned from 2100.38.070 to 2100.26.316. Aggie Blandford
11/30/2006 Update or Other Action RECKEY has automatically been generated. Former Staff
4/7/2008 Exposure Tracking Model Ranking Initial ranking. Bill Petrik
5/4/2011 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77964 Former 700 Gallon Diesel Emergency Generator UST. Bill O'Connell
5/17/2011 Cleanup Complete Determination Issued The Alaska Department of Environmental Conservation, Contaminated Sites Program (ADEC) has completed a review of the environmental records associated with National Bank of Alaska-Benson, located at 1500 West Benson Blvd. in Anchorage, Alaska. Based on the information provided to date, it has been determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment and no further remedial action will be required as long as the site is in compliance with established institutional controls (ICs). Bill O'Connell
5/17/2011 Institutional Control Record Established Institutional Controls established and entered into the database. Bill O'Connell
7/5/2011 Document, Report, or Work plan Review - other Work plan approved for decommissioning of two monitoring wells Bill O'Connell
8/5/2011 Update or Other Action Report detailing the decommissioning of the two onsite monitoring wells received by ADEC. Bill O'Connell
2/8/2012 Institutional Control Compliance Review IC review conducted, staff named changed from O'Connell to IC Unit, reminder system updated to follow up with RP in five years regarding site conditions. Evonne Reese
9/6/2016 Institutional Control Compliance Review IC compliance review conducted. Scheduled to send IC reminder letter in near future. Nathan Maxwell
9/7/2016 Institutional Control Update Sent IC reminder letter to the responsible party on this date. Nathan Maxwell
6/20/2018 Institutional Control Compliance Review IC compliance review conducted. Closure/IC Details updated. Reminder system already set for follow-up in 2021. Kristin Thompson
4/1/2019 Institutional Control Record Removed Jamie Grant

Contaminant Information

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

Control Type

Type Details
No ICs Required

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.
Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70)
Hazard ID Site Name File Number
27008 Commercial Property - 1500 West Benson Blvd UST 2 2100.26.618

Missing Location Data

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State of Alaska Department of Environmental Conservation

P.O. Box 111800
Juneau, AK 99811-1800
Phone: 907-465-5066
Fax: 907-465-5245
TDD: 800-770-8973
Physical Location: 410 Willoughby