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Site Report: ADOT&PF Juneau Equipment Yard

Site Name: ADOT&PF Juneau Equipment Yard
Address: Mile 7 Glacier Highway, 6860 Glacier Highway, Juneau, AK 99801
File Number: 1513.38.024
Hazard ID: 1177
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 58.360000
Longitude: -134.526670
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 former unpermitted landfill located on Lot 5 may contain a variety of chemicals ranging from paint and solvents to polychlorinated bi-phenyls (PCBs). In addition to chemicals, the site was potentially used for disposing construction debris, including carpet scraps and roofing materials. The landfill could originally be accessed by the public. There are no records of the type and quantity of material placed in the landfill. Two environmental assessments have been conducted on the former landfill site. The first assessment was conducted in 1993 and included collecting soil and ground water samples from test pits and monitoring wells (Randolph Bayliss, 1993). One soil sample collected from a test pit contained a diesel range organics (DRO) concentration of 240 milligrams per kilogram (mg/kg), which was greater than the 200 mg/kg cleanup level established by the ADEC. Based on the 1993 assessment, it was determined by Bayliss Inc. that there was no significant petroleum hydrocarbon contamination and that further corrective action was not warranted. In 2003, Smith, Bayliss, LeResche Inc. performed site characterization efforts on Lots 4 and 21, west of the former landfill (Smith, Bayliss, LeResche Inc., 2004). They advanced six test pits and collected one soil sample. The soil sample contained 300 mg/kg DRO, which was greater than the ADEC cleanup level. The data indicated that Lot 5 may have “pockets” of petroleum contamination possibly associated with leaking and/or decaying containers in the unpermitted landfill.

Action Information

Action Date Action Description DEC Staff
8/22/1991 Long Term Monitoring Established (Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Bio remediation plan for soils contaminated by diesel release at dispenser pump. Soils excavated and placed in on-site biocells A&B according to approved 2-year bioremediation plan. Randy Rice
8/26/1993 Site Added to Database Petroleum release to soils, partially excavated and placed into on-site biocells. Former Staff
11/10/1994 Site Ranked Using the AHRM Initial ranking. Former Staff
10/17/1995 Leaking Underground Storage Tank Corrective Action Underway (Old R:Base Action Code = RARR - Remedial Action Report Review (CS)). 6,000 gallon heating oil tank removed. Soil sample from excavation had 33ppm DRO and was "not a pattern match for diesel". Approval to backfill the excavation and No further Action letter sent to the RP. Sally Schlichting
3/1/1996 Site Number Identifier Changed Workplan changed to "01". Sally Schlichting
6/19/1996 Update or Other Action Soil below cleanup. Sally Schlichting
5/30/1998 Update or Other Action Request for No Further Action Reviewed. Recommended a new set of samples be taken in accordance with the NFA proposal from ADOT. If samples reveal lower levels of contamination than previous samples, NFA will be issued with long-term monitoring. John Mazzitello
12/18/1998 Long Term Monitoring Complete Petroleum contamination in biocell "A" soils, nearest Glacier Highway, near cleanup levels. Spreading of the soils on-site approved. Moving the soils off-site require department approval. Sally Schlichting
9/13/2002 Update or Other Action Site status changed from closed to Active assigned to Wanstall. File does not contain Final Corrective Action report for the 130 gallon oil spill at the dispenser station. Corrective action is planned at the site for regulated UST contamination under Event ID 2594 for Facility ID 3003. Bruce Wanstall
1/9/2003 Update or Other Action Environmental Site Assessment Workplan for the property received. The report includes a chronological series of aerial photographs and interviews with DOT staff; no mention of an on-site landfil. Bruce Wanstall
2/13/2003 Leaking Underground Storage Tank Corrective Action Underway Site visit to observe and advise on groundwater well installation for additional site investigation of residual contamination from regulated USTs (see LUST database). Screening of boring samples indicates pattern of migrating petroleum contamination at the site. Lab samples collected to follow-up. Bruce Wanstall
8/10/2004 Update or Other Action Temporary soil storage stockpile set up above the stockyard; 50 cubic yards of soil contaminated with DRO transported from the SOB UST excavation. Bruce Wanstall
8/20/2004 Proposed Plan Lots west of Stockyard Lot 5 6860 Glacier Highwaqy Site Assessment workplan approval letter sent to RP consultant. Bruce Wanstall
3/31/2005 Update or Other Action Site Investigation of Lots 4 and 21 at the west end of the 7-mile facility stockyard was completed; weathered diesel was detected in soil on Lot 5 of USS 3258, just east of Lot 4. At the west end of Lot 5 diesel was detected in a soil sample in concentrations of 300 mg/kg, slighlty above the most conservative cleanup level of 230 mg/kg. Additonal trenching was beyond the scope of the current project. Bruce Wanstall
5/12/2005 GIS Position Updated GIS update Site Inspection lat long data obtained using Garmin 76 GPS; accuracy is high within 100 meters was checked on Topozone Pro web utility where metadata was projected on USGS 1:24000 topographic map and recorded at G:\SPAR\Spar-Contaminated Sites\38 Case Files (Contaminated Sites)\1513 Juneau\1513.38.024 ADOT&PF Equipment Yard Bruce Wanstall
6/13/2005 Site Ranked Using the AHRM Contaminant value changed to include gasoline spill from regulated underground storage tank. Bruce Wanstall
8/17/2006 Update or Other Action Site investigation into a historical closed landfill on the ADOT&PF property west of the main facility on Lot 5 has been added to the contaminated site record. The 1993 Report presents data from four monitoring wells and nine test pits indicating that subsurface soil and water are not impacted by petroleum or metals contamination. The contents of the former landfill remain uncertain but were in a stable condition as of 1994. The report recommends that the groundwater wells installed should be monitored every two years to ensure that the landfill contents are stable. The landfill was not permitted and was not under a waste management plan. Bruce Wanstall
2/8/2007 Exposure Tracking Model Ranking Baseline ranking for the solid waste potential source area (unpermitted landfill). Bruce Wanstall
1/9/2008 Cleanup Assumed by ADEC ADEC met with the ADOT regional environmental manager to further coordinate RFP development for vapor intrusion sampling of the main building at the Regional Shop Bruce Wanstall
1/25/2008 Update or Other Action Quality assurance review of the 2007 sampling report data was completed for the on-site landfill. Data meet ADEC standard and are acceptable for all parameters tested. GRO, DRO, RRO and benzene were detected, but at concentrations below Table C groundwater cleanup levels. Snow melting to overlying surface water may have affected the data for this sampling event. Bruce Wanstall
4/30/2008 Update or Other Action The approved 2008 Groundwater Monitoring and Vapor Intrusion Work Plan received by the ADEC (SLR). Bruce Wanstall
5/2/2008 Site Visit Vapor intrusion and ground water well monitoring event Bruce Wanstall
10/22/2008 Document, Report, or Work plan Review - other An environmental consultant for DEC examined the west stockyard wells and the east stockyard wells and collected samples of groundwater for laboratory analysis and field tested ambient air in one of the occupied buildings on the property in 2007 and 2008. Results indicate that benzene and gasoline range hydrocarbon concentrations in groundwater between the source area in the east stockyard and occupied buildings are declining with ORC active treatment. Exposure along the indoor air vapor intrusion pathway is not a current risk for the building that was tested. Laboratory analysis of a sample of groundwater from a well in the west stockyard detected GRO, DRO, RRO and benzene at levels below Table C regulatory levels. Bruce Wanstall
5/7/2010 Update or Other Action Additional groundwater sampling is recommended in the initial 1993 assessment of the unpermited landfill to ensure that off-site migration pathways are protected. 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
7/2/2010 Document, Report, or Work plan Review - other ADEC evaluation of the letter-report titled June 2010 Groundwater Sampling, ADOT&PF Southeast Regional Complex, 6860 Glacier Highway, Juneau, Alaska by Shannon & Wilson finds the data meet field and laboratory quality assurance criteria and is approved. Bruce Wanstall
1/5/2011 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78117 Solid Waste. The objective of periodically monitoring groundwater for contamination is to establish a trend over time to determine if residual contamination is expanding, stable or in decline. If the data indicate an expansion of contamination then additional assessment and/or cleanup action will need be performed to ensure the site does not pose an unacceptable risk to human health or the environment. Bruce Wanstall
9/9/2011 Update or Other Action Corrective Action monitoring of the UST Release Source area 77612 is managed under ADOT&PF Regional Complex database record. The release source has been removed from this record to separate that source area from source area 78117 because the subsurface soil and groundwater contamination from the two sources is separate and not comingled. Bruce Wanstall
3/22/2012 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78117 Solid Waste. Site Investigation sampling detected DRO in soil above the 75.341 Table B1 level of 230 mg/kg and BTEX compounds detected in a sample of groundwater were all below regulatory levels in 75.345 Table C. The objective of periodically monitoring groundwater 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 need be performed to ensure the site does not pose an unacceptable risk to human health or the environment. Bruce Wanstall
7/17/2013 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78117 Solid Waste. The objective of periodically monitoring groundwater 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 need be performed to ensure the site does not pose an unacceptable risk to human health or the environment. Bruce Wanstall
4/9/2014 Document, Report, or Work plan Review - other DEC approved the 2013 monitor well sampling report by Shannon & Wilson for final payment. Bruce Wanstall
4/25/2016 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78117 Solid Waste. Bruce Wanstall
8/26/2016 Cleanup Complete Determination Issued DEC has determined that based on the information provided to date, 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 unless new information becomes available that indicates residual contamination may pose an unacceptable risk. 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

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)

No associated sites were found.

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