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Site Report: ADOT&PF Klawock Maintenance Station UST #1

Site Name: ADOT&PF Klawock Maintenance Station UST #1
Address: Klawock Airport Road, Klawock, AK 99925
File Number: 1517.26.006
Hazard ID: 26297
Status: Cleanup Complete
Staff: ,
Latitude: 55.579833
Longitude: -133.066511
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.


In July 2014, a 5,000-gallon diesel underground storage tank (UST #1) was removed from the Alaska Department of Transportation and Public Facilities at the Klawock Maintenance Station. The UST was located just east and adjacent to the generator building and was historically used to fuel the generator. The UST Removal Site Assessment indicated that the fiberglass tank was in excellent condition with no holes or suspected leaks. Fuel odors were noted around the fill pipe indicating potential contamination from overfilling during fuel transfer operations. Analytical soil sample S1 collected from the south sidewall soil sample at the existing soil/groundwater interface (5.5 feet below ground surface) had concentrations of diesel range organics (DRO) above cleanup levels, but polycyclic aromatic hydrocarbon compounds were below laboratory reporting limits and cleanup levels. The sample collected below the vent stickup at the Generator Building had DRO, benzene, toluene, ethylbenzene, and xylene results below DEC cleanup levels. The Leaking Underground Storage Tank Release Investigation concluded that a Corrective Action Plan should confirm that commercial/industrial use of the facility is expected to continue, potential exposure pathways are limited, verify groundwater contamination is limited to the former UST area of the industrial facility, develop a long-term groundwater monitoring plan that defines specific sampling locations, sampling frequencies, and laboratory analyses, and explore using monitored natural attenuation as an effective long-term remediation strategy.

Action Information

Action Date Action Description DEC Staff
11/4/2014 Site Added to Database A new site has been added to the database Mitzi Read
11/4/2014 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST site created in CSP database for source area 5,000-Gallon Diesel UST #1, 79687 Mitzi Read
11/5/2014 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79687 name: 5,000-Gallon Diesel UST #1 Mitzi Read
12/4/2015 Report or Workplan Review - Other DEC has approved by letter sent today to DOT Maintenance and Operations: 5,000-gallon Underground Storage Tank (Tank#1) Site Assessment Report, ADOT&PF Klawock Maintenance Facility #781, Klawock, Alaska (Report), dated October 2, 2014. Nortech Engineering Inc. completed the Report to document a petroleum release associated with the closure by removal of the regulated underground storage tank #1 that provided fuel to the emergency electrical generator building at the ADOT&PF Klawock Maintenance Station. DEC concurs with the Report conclusions and recommendation that ADOT&PF submit a plan to conduct groundwater investigation for contamination associated with the UST release at the Facility. Bruce Wanstall
7/19/2016 Report or Workplan Review - Other DEC has evaluated the work plan for acceptance criteria and approves the plan with the following requests. Two or three temporary wells are adequate to assess the situation. I suggest only one sample be analyzed for BTEX (due to ND results in the soil sample) and test one sample for RCRA metals. Bruce Wanstall
9/30/2016 Leaking Underground Storage Tank Cleanup Initiated - Petroleum Administrative action addition for grant reporting purposes. Evonne Reese
2/23/2017 Report or Workplan Review - Other DEC sent an approval letter today regarding the Nortech Site Assessment Report investigating groundwater at the site for contamination. DEC concurred with the conclusions in the Report that minor detections indicate contamination is below cleanup levels. The data meet field and laboratory report quality assurance criteria in Contaminated Sites Program guidance documents and the UST Procedures Manual. The Report documents the results of field and laboratory investigation into petroleum release from regulated UST systems as required by 18 AAC 78.230 - 18 AAC 78.280 and 18 AAC 78.600 - 18 AAC 78.625. Bruce Wanstall
3/8/2017 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79687 5,000-Gallon Diesel UST #1. Bruce Wanstall
3/16/2017 Cleanup Complete Determination Issued Soil and groundwater contamination at the site have been cleaned up to concentrations below the approved cleanup levels suitable for residential land use. This site will receive a “Cleanup Complete” designation on the Contaminated Sites Database, subject to the standard conditions. This determination is in accordance with 18 AAC 78.276(f) and does not preclude DEC from requiring additional assessment and/or cleanup action if future information indicates that contaminants at this site may pose an unacceptable risk to human health, safety, or welfare or to the environment. Bruce Wanstall
3/16/2017 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79687 5,000-Gallon Diesel UST #1. Bruce Wanstall

Contaminant Information

Name Level Description Media Comments
DRO 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
No ICs Required


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)

Missing Location Data

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