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Site Report: ADOT&PF DPS Ketchikan Shop

Site Name: ADOT&PF DPS Ketchikan Shop
Address: 5148 and 5150 N. Tongass, Mile 4.5, Ketchikan, AK 99901
File Number: 1516.38.031
Hazard ID: 3991
Status: Cleanup Complete
Staff: ,
Latitude: 55.377545
Longitude: -131.725103
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.


A 1,100-gallon underground storage tank (UST) used to supply heating oil to the facility boiler was formerly located at the main door to the offices of the Department of Public Safety. During the change in service site assessment of the tank and associated piping in August 2003, soil contaminated with fuel from the UST system was observed in the excavation. A minor amount of water was encountered in the excavation between three and four feet below the surface and was removed with the contaminated soil and moved to the lined stockpile. Bedrock was encountered at the floor of the excavation. Groundwater was not observed entering the excavation during the sampling activity. Diesel range organics (DRO) was detected in soil above Method Two Migration to Groundwater cleanup levels in one of five pit confirmation samples. Stockpile soil was sampled in 2007 and DRO levels were below instrument detection and the soil was released for unrestricted use. Groundwater monitoring was later conducted at this facility for fuel releases from other tanks regulated under 18 AAC 78. That site activity is not directly related to this heating oil release but are included in the actions for this record.

Action Information

Action Date Action Description DEC Staff
2/3/2004 Site Added to Database HHOT heating oil contamination. No Longer Assigned
2/5/2004 Site Ranked Using the AHRM Preliminary ranking. Bruce Wanstall
2/5/2004 Update or Other Action Surface and subsurface drinking water use has been identified in the North Tongass Highway area. Anadromous fish stream is next to the facility; Site is property where Leaking Underground Storage Tanks (LUST) Event ID#1993 was identified in 1994 and LUST Event ID#2598 was identified in 1999. Both tank closures left minor soil contamination. Bruce Wanstall
5/6/2004 Update or Other Action This property shared by DOT and DPS. Three release events from underground storage tank closures are recorded at the site; soil contamination did not impact streams on east and west sides of the property. Bruce Wanstall
10/27/2004 Update or Other Action USGS 1:24K/25K Series topographic map interpolation of property latitude and longitude referenced to North American Datum (NAD) 27 using web-based service. Bruce Wanstall
3/1/2005 Update or Other Action Noll 2003 Report reviewed; Qualified lab confirmed; Noll Environmental is not listed on the Underground Storage Tank Program qualified consultant list. Bruce Wanstall
7/18/2005 Meeting or Teleconference Held Met shop foreman on-site to discuss history of UST closures and contaminated soil stockpile conditions. Inspected sediments and banks of streams that run along opposite sides of the property; no petroleum impacts were found. Seeps in stream banks are not present; no indication that groundwater is present beneath the former UST closure sites. No wells are located on the property or in the area to indicate existing or potential use of groundwater as drinking water source. Bruce Wanstall
7/19/2005 GIS Position Updated GIS lat long data entered. Metadata include GPS Garmin on-site instrument reading using NAD 83. Accuracy is considered high; within 10 meters despite limited number of satellite readings due to physical barriers such as trees. Topographic map projection of data using Topozone Pro web utility on USGS 1:24,000 scale is stored at: G:\SPAR\Spar-Contaminated Sites\38 Case Files (Contaminated Sites)\1516 Ketchikan\1516.38.031 ADOTPF-DPS Ketchikan Facility. Bruce Wanstall
5/21/2007 Update or Other Action ADEC met with station manager Nick Barstadt at the site to check on the status of the contaminated soil stockpile stored in the equipment yard. The stockpile was intact but the cover has deteriorated; ponded water in the unpaved area had no sheen or stressed vegetation that would indicate that oil was leaching with surficial runoff from the stockpile. Nick volunteered to repair the cover over the stockpile. Bruce Wanstall
6/20/2007 Exposure Tracking Model Ranking Groundwater ingestion exposure pathway is complete for future access as a drinking water source; this can be controlled with institutional controls on the property. Bruce Wanstall
8/8/2007 Update or Other Action Site Characterization Workplan discussion was held with term contractor to investigate current condition of the groundwater and contaminated soil stockpile. Bruce Wanstall
10/8/2007 Update or Other Action Review and comment on the draft workplan for GW and soil stockpile assessment. Approval for the final version of the workplan was sent by email. Bruce Wanstall
2/7/2008 Report or Workplan Review - Other ADEC reviewed and approved Groundwater and Soil Stockpile Assessment ADOT&PF Maintenance Station Ketchikan Alaska by Shannon & Wilson. New soil borings advanced to bedrock found no groundwater under the concrete dispenser island and piping run. Three monitoring wells were installed at the former UST excavation in a line parallel with the stream. Analysis of water samples from the wells found weathered gasoline in concentrations below ground and surface water standards. Analysis of the samples from contaminated soil stockpile detected none of the hydrocarbon analytes. Bruce Wanstall
4/3/2009 Update or Other Action The site is long term monitoring for residual soil and groundwater contamination on the property. A sampling event of the monitoring wells is proposed for FY09 and will be completed when funding is available. Bruce Wanstall
5/7/2010 Update or Other Action FY2010 field work includes additional groundwater sampling to monitor declining hydrocarbon contamination to ensure that off-site migration pathways are protected and possibly close the site. The objective of periodically monitoring the ground water for contamination is to establish a trend over time to determine if residual petroleum contamination is expanding, stable or in decline. If the data indicate an expansion of contamination then additional assessment and/or cleanup action will be performed to ensure the site does not pose an unacceptable risk to human health or the environment. Bruce Wanstall
1/4/2011 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 74965 heating oil UST. Bruce Wanstall
1/21/2011 Report or Workplan Review - Other ADEC evaluation of the letter-report titled Groundwater Sampling, ADOT&PF Maintenance Facility, Ketchikan, Alaska by Shannon & Wilson finds the data meet field and laboratory quality assurance criteria and is approved. The tops of the three well casings were observed to have frost-jacked cycles to heights that prevented the monument lids from securing into the monument rings. Submersible pump was used to purge the wells and collect samples. The 2010 well samples have DRO and RRO in concentrations exceeding Table C levels. Bruce Wanstall
9/2/2011 Report or Workplan Review - Other DEC evaluation of 2011 Groundwater Monitoring Report ADOT&PF Maintenance Facility Ketchikan AK by Oasis finds the site activity met the objectives of the project and an assessment of the sample collection demonstrated that a sufficient number of representative samples were collected and the precision, accuracy and completeness of the resulting analytical data is sufficient to be used to support the decision making process. In accordance with Title 18 Alaska Administrative Code (AAC) 75.360, qualified person(s) used data collection and field screening methods consistent with DEC methodology in the approved site assessment work plan. The DEC laboratory report checklist submitted as an attachment is acceptable and the data meet field and laboratory report quality assurance criteria in Contaminated Sites Program guidance documents, therefore the Report is approved in accordance with 18 AAC 75.335(d). Bruce Wanstall
3/22/2012 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 74965 USTs as ID# 2598. Bruce Wanstall
6/28/2012 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST site created in CSP database for source area USTs as ID# 2598, 74965 Bruce Wanstall
6/28/2012 Leaking Underground Storage Tank Cleanup Initiated - Petroleum Administrative action addition for grant reporting purposes. Evonne Reese
6/28/2012 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 74965 USTs as ID# 2598. Bruce Wanstall
6/29/2012 Cleanup Complete Determination Issued The cleanup actions to date have served to excavate and adequately remove contaminated soil from the site. Based on the information available, DEC has determined no further assessment or cleanup action is required. There is no longer a risk to human health or the environment, and this site will be designated as closed on the Department's database. This determination is in accordance with 18 ACC 75.380 and does not preclude DEC from requiring additional assessment and/or cleanup action if future information indicates that this site may pose an unacceptable risk to human health or the environment. Bruce Wanstall

Contaminant Information

Name Level Description Media Comments
DRO 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.

Missing Location Data

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