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Site Report: Crowley Ketchikan Town Station USTs 1-4

Site Name: Crowley Ketchikan Town Station USTs 1-4
Address: 4161 Tongass Avenue, Ketchikan, AK 99901
File Number: 1516.26.042
Hazard ID: 27236
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 55.358820
Longitude: -131.699629
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

The site is a gas station located at 4161 Tongass Avenue, Ketchikan, Alaska on Lot 1 of the Petro Alaska Subdivision of Tract 1007 of the Ketchikan Recording District. The site previously contained two 20,000-gallon gasoline USTs, a 20,000-gallon diesel UST, and one 2,000-gallon mixed gasoline UST, with associated lines and land-side fuel, dispensers. The tanks and most of the piping connecting the tanks to the land-side dispensers were removed in August 2016 as part of the closure activities but the dispensers remained on site and the piping to the fuel dock was abandoned in place. All four tanks were permanently closed in the DEC database. During tank removal, contaminated soil was observed at several locations from 2 feet below ground surface(bgs) beneath fuel lines, to the smear zone that ranged from 10 feet to greater than 16 feet bgs. Fifty yards of potentially contaminated soil were removed from the excavation and stockpiled on site. Additional excavated soil not believed to be impacted was placed back in the excavation, a polyethylene liner was placed in the open excavation and clean fill was backfilled to bring the excavation back to grade. Field and analytical results indicated contamination remains onsite and additional delineation is necessary to determine the extent of contamination in the soil and groundwater.

Action Information

Action Date Action Description DEC Staff
6/26/2020 Site Added to Database A new site has been added to the database Mitzi Read
6/26/2020 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST site created in CSP database for source area USTs 1 & 2 (20,000-gal Gas), UST 3 (20,000-gal Diesel), & UST 4 (2,000-gal Gas), 80612 Mitzi Read
7/15/2020 Potentially Responsible Party/State Interest Letter Shawn Tisdell
7/28/2020 Document, Report, or Work plan Review - other ADEC) has reviewed and provided comments on the 2019 Supplemental Site Assessment and Remedial Investigation report and the February 6th 2020 letter report detailing activities and results of three groundwater monitoring events in 2019. Impacted soil was observed from less than one foot below ground surface (bgs) to a depth of 23.5 ft bgs at various location across the site. Impacted groundwater appears to be minimal, however an additional sampling event will be conducted to assess trends. Data gaps remain around much of the perimeter of the previous investigation and additional investigation has been requested. Shawn Tisdell
7/28/2020 Leaking Underground Storage Tank Cleanup Initiated - Petroleum RP is working on characterizing degree and extent of contamination at the site. Shawn Tisdell
12/28/2020 Site Characterization Report Approved DEC reviewed and approved the revised 2019 Supplemental Site Assessment and Report. All DEC comments on the report have been addressed. Cross-sectional figures have been added to the report to assist with data presentation. Additional site characterization activities will be planned for the site to address remaining data gaps. Shawn Tisdell
4/6/2021 Meeting or Teleconference Held Meeting was held between ADEC and Crowley representatives to discuss cleanup activities proposed for April/May of this year on the Crowley Lot 1 property. Activities include advancing additional borings to the south and west of the former UST tank location and continue stepping out until the degree and extent of contamination has been defined. Shawn Tisdell
4/9/2021 Document, Report, or Work plan Review - other DEC received Draft Workplan Addendum titled Supplemental Site Assessment and Release Investigation on 3/18/2021. The objective of this project is to fully define the nature and extent of soil and groundwater contamination resulting from the UST release on the Crowley Lot 1 property. The workplan was reviewed and DEC comments were added requesting additional site characterization south of the former USTs along the lot line shared with lot 2 to further define contamination in this area. Shawn Tisdell
4/15/2021 Site Characterization Workplan Approved DEC reviewed Workplan Addendum titled Supplemental Site Assessment and Release Investigation The objective of this project is to fully define the nature and extent of soil and groundwater contamination resulting from the UST release. This workplan included advancing borings south west of the former UST source area where they will continue to step out until the extent of contamination is observed in this area, and along the Crowley Lot 1 lot line south of the former UST release area to delineate contamination along the shared Lot 1/Lot 2 property line. Shawn Tisdell
4/23/2021 Offsite Soil or Groundwater Disposal Approved Transport approval provided for 1/4 supersack of soil drill cuttings from week of 4/21/2021 site characterization activity and for 4-55gal drums of purge and decontamination water. Treatment of soil at NRC OIT facility, disposal of water at NRC/OIT if non hazardous or at Part B Subtitle C landfill in Grandview Idaho if deemed RCRA waste. Shawn Tisdell
8/3/2021 Document, Report, or Work plan Review - other ADEC received a remedial investigation report presenting results of an April 2021 soil and groundwater sampling event to fully delineate soil contamination at the site. The report indicates that soil contamination south and west of the former UST excavation area has been fully delineated and soil contamination has been delineated along the south edge of Lot 1. Recommendations in the report were for no further investigation, to decommission groundwater monitoring wells and close the site with institutional controls. Shawn Tisdell
11/22/2021 Document, Report, or Work plan Review - other DEC staff reviewed the August 2021 Draft Supplemental Site Assessment and Remedial Investigation (SSA/RI) Report Addendum. Four borings were advanced to the west of the former USTs, defining the extent of contamination in that direction. Four borings were also advance along the shared Crowley Lot 1 and Taquan Air (Lot 2) property lines to provide additional evidence that contamination was delineated between the two lots. Low levels of diesel range organics, select volatile organic compounds, select polyaromatic hydrocarbons, and lead were observed in some of the samples, however all were well below ADEC cleanup levels. Site closure was requested. Shawn Tisdell
4/4/2022 Document, Report, or Work plan Review - other A work plan to decommission all 8 monitoring wells on the site was reviewed and approved. The work is expected to occur during April or May of 2022. Shawn Tisdell
6/23/2022 Document, Report, or Work plan Review - other A Groundwater Monitoring Well Decommissioning Report submitted on 5/27/2022 was reviewed and approved. Eight monitoring well that had been installed to evaluate impacts of groundwater contamination across the site were removed according to the Well Decommissioning Workplan. Shawn Tisdell
6/23/2022 Final Cleanup Report Reviewed The 2021 Final Supplemental Site Assessment and Release Investigation Report Addendum was approved. See action entry on 11/22/2021 for summary of the report. Shawn Tisdell
12/7/2022 Meeting or Teleconference Held DEC staff met with Crowley and consultants to discuss site closure document status and determine next steps for preparing the environmental covenant and site closure document. Shawn Tisdell
3/30/2023 Meeting or Teleconference Held DEC met with Crowley Fuels Alaska LLC and Kasteler Consulting, Inc. to discuss questions regarding the closure documents and site closure pathway. The DEC will complete the drafts, conduct internal reviews and provide the updated drafts to Crowley for review. Shawn Tisdell
6/29/2023 Cleanup Complete Determination Issued Shawn Tisdell
6/29/2023 Institutional Control Record Established Institutional Controls established and entered into the database. Shawn Tisdell

Contaminant Information

Name Level Description Media Comments
Benzene < Method 2 Most Stringent Soil
DRO < Method 2 Most Stringent Soil
GRO < Method 2 Most Stringent Soil
Lead - Total > Human Health/Ingestion/Inhalation Soil

Control Type

Type Details
Environmental Covenant

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site. DEC approval is required prior to moving soil or groundwater where contamination remains above applicable cleanup levels. If DEC approval for movement is granted, any moved soil or groundwater must still be characterized and managed following regulations applicable at that time.
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)
When Contaminated Soil is Accessible, Remediation Should Occur In the event that contaminated soil on the Property becomes accessible in the future, the Grantor shall notify DEC, characterize the contamination, and, if determined necessary by DEC, cleanup the soil pursuant to DEC’s Site Cleanup Rules.
Subdivision Restriction DEC must be notified in advance of any subdivision or replat of the Property. This Covenant must be included as part of future Property transactions and attached to subsequent associated parcels, as determined applicable by DEC.
Groundwater Use Restrictions Groundwater throughout Alaska is protected for use as a water supply for drinking, culinary and food processing, agriculture including irrigation and stock watering, aquaculture, and industrial use. Contaminated site cleanup complete determinations are based on groundwater being considered a potential drinking water source. In the event that groundwater from this Site is to be used for other purposes in the future, such as aquaculture, additional characterization and treatment may be required to ensure the water is suitable for its intended use.

No associated sites were found.

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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