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Site Report: ADOT&PF Haines Maintenance Station Vehicle Repair Shop

Site Name: ADOT&PF Haines Maintenance Station Vehicle Repair Shop
Address: 720 Main Street, Haines, AK 99827
File Number: 1508.38.025
Hazard ID: 26276
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 59.236438
Longitude: -135.456844
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.

Problems/Comments

In 2007, an ADOT&PF contractor reportedly identified, by odor and staining, an estimated volume of 150 cubic yards of petroleum-contaminated soil during excavation to remove a vehicle lift from the repair shop at the Haines Maintenance Station. The soil was placed in three separate containments on-site based on the size of the plastic sheeting used to line and cover each stockpile. In fall 2013, ADOT&PF proposed a sampling plan to characterize contamination in the soil stockpiles. The objective was to develop a DEC-approved soil disposal plan. Since the release was apparently hydraulic oil, DEC requested ADOT&PF submit a sampling plan using a Multi-Increment (MI) Soil Sampling. The ADOT&PF contractor chose to use a simple random approach to MI, producing results for diesel range (DRO) hydrocarbon concentrations in stockpile soil ranges from 1,000-7,000 mg/kg (95%UCL). If a soil SPLP analytical result exceeds Table C then a liner is required for landspreading the soil on the industrial land-use property not within 100 feet of a water body. The stockpile sample chemical data characterizing subsurface soil excavated from under the main shop building have greater DRO concentrations than soil samples collected from remaining soil in the underground storage tank removal excavation located north of the building. Comparing the results indicates another source of contamination is present under the building. Previous groundwater investigation at the site between 2007 and 2012 found the depth to groundwater, when present, was six feet below ground surface on the property. DEC approved a plan for release investigation of soil and groundwater south and west of the main shop building where the vehicle lift was removed to determine the extent soil and/or groundwater contamination.

Action Information

Action Date Action Description DEC Staff
10/2/2013 Update or Other Action Oil Spill Notification Form submitted by ADOT&PF for a release discovered in 2007 surrounding a vehicle lift in the Haines Maintenance Shop. Soil that was contaminated was very obvious based on fuel/oil odor and staining. An estimated volume of 150 cubic yards of contaminated soil was stockpiled between layers of polyethylene in the northeast quarter of the stockyard. The lift was backfilled with clean soil. Bruce Wanstall
1/22/2014 Document, Report, or Work plan Review - other DEC has reviewed approves the Shannon & Wilson soil testing work plan (Plan) for ADOT&PF Statewide Facilities and has no comments, requests or additions. The Plan employs the multi-increment methodology. The sampling, analysis and reporting schedule in the Plan was drafted by a qualified third party and is in agreement with Contaminated Sites Program quality assurance requirements and guidance documents therefore the Plan is approved in accordance with 18 AAC 75.335(b). Bruce Wanstall
9/9/2014 Document, Report, or Work plan Review - other DEC found the analytical data and the laboratory report checklist in the Shannon & Wilson Stockpile Sampling Report are acceptable, therefore the Report is approved in accordance with 18 AAC 75.335(d). The 95% upper confidence limit for the multi-increment sampling data on the three stockpiles of soil found DRO concentrations that fall between the migration to groundwater levels and the inhalation/ingestion soil cleanup levels. DEC requested ADOT&PF submit a conceptual site model and a sampling plan to determine the extent of DRO contamination remaining at the spill site and a stockpile remedial plan. The preferred option is landspreading on-site ( possible if the SPLP/AK102 leachate test is acceptable). Another option is a DEC-approved asphalt recycling plan (as prescribed in cleanup operations requirements in 18 AAC 75.360 and the UST Procedures Manual) and a third option is shipment to an off-site landfill. Bruce Wanstall
9/25/2014 Site Added to Database A new site has been added to the database Mitzi Read
12/5/2014 Document, Report, or Work plan Review - other DEC has reviewed and approves Work Plan for Release Investigation, ADOT&PF Haines Maintenance Station, (Plan), completed by Shannon & Wilson (S&W) on November 26, 2014. The Plan is approved in accordance with 18 AAC 75.335(b) provided S&W submits an amended Plan to add volatile organic compounds to the analyte list and an evaluation of the exposure pathways and receptors at the site and fate and transport mechanisms for contaminated media equivalent to a conceptual site model. Bruce Wanstall
12/29/2014 Document, Report, or Work plan Review - other DEC has reviewed and approves the Revised Release Investigation Plan, authored by Shannon & Wilson (S&W) on 12/15/14, submitted by email from ADOT&PF on 12/16/14. DEC has reviewed and disapproves the Work Plan for Haines Soil Stockpile Disposal authored by S&W on 12/3/14, also submitted by email from ADOT&PF on 12/16/14. In the previously submitted Haines Soil Testing, Haines Maintenance Station, Alaska (8/20/14), S&W concludes (page 5) that to implement a landspreading plan for DRO contaminated soil it may be necessary to gather additional information to demonstrate that potential surface water runoff will not impact surface water bodies and leaching will not impact groundwater. DEC requests that ADOT&PF make arrangements for S&W to collect a composite sample from each of the three on-site soil stockpiles for analysis of the Synthetic Precipitation Leaching Procedure (SPLP). As stated in the DEC Landfarm Tech Memo (2011), soil displaying SPLP results below Table C values for DRO may be landspread on the property without a liner. Soil not passing the SPLP test may also be landspread but requires a 10 millimeter plastic liner. Feasibility for this remedial option requires non-residential land use and a location 100 lateral feet from any surface water body and six vertical feet from groundwater. With regard to the Work Plan for Haines Soil Stockpile Disposal, authored by S&W with a Southeast Roadbuilders Inc. (SRI) Work Plan for asphalt recycling of contaminated soil, submitted by email dated 12/16/14, DEC review has determined that this proposal may be acceptable for a specific paving project at a specific location. Approval of this proposed plan will require materials testing on the stockpile to determine the degree of blending of contaminated soil with structurally sound material to meet the necessary specifications for a paving project in Haines. SRI is not a DEC-approved soil treatment facility and is not approved to accept and store contaminated soil at the SRI asphalt facility in Haines. Bruce Wanstall
2/12/2015 Document, Report, or Work plan Review - other DEC evaluated and confirmed a revised Site Investigation work plan for requested minor changes regarding the contaminated soil stockpile remedial option. Sent approval by email to Shannon & Wilson, contractor for ADOT&PF performing work at the Haines Maintenance Station. Bruce Wanstall
3/31/2015 Update or Other Action ADOT&PF submitted photographic evidence that the stockpile of soil has been land spread on the adjacent property and the three monitoring wells have been decommissioned. Bruce Wanstall
8/14/2015 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79663 name: Vehicle Repair Shop Bruce Wanstall
8/14/2015 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79663 Vehicle Repair Shop. Bruce Wanstall
10/2/2015 Document, Report, or Work plan Review - other DEC letter approved 'Work Plan for Well Decommissioning and Soil Landspreading, ADOT&PF Haines Maintenance Station, Haines, Alaska; Hazard ID 26276' (Plan), dated September 15, 2015. Shannon & Wilson completed the Plan for Alaska Department of Transportation & Public Facilities (ADOT&PF) Haines Maintenance Station Vehicle Repair Shop (Site) located at 720 Main Street in Haines, Alaska. ADOT&PF will decommission three monitor wells and will remediate stockpiled DRO contaminated soil by Landspreading on-site. Bruce Wanstall
3/31/2016 Update or Other Action ADOT&PF submitted photographic evidence that the stockpile of soil was land spread on the adjacent property and the three monitoring wells were removed from the site. Bruce Wanstall
11/14/2016 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79663 Vehicle Repair Shop. Bruce Wanstall
11/25/2016 Cleanup Complete Determination Issued ADEC has completed a review of the environmental records associated with the ADOT&PF Haines Maintenance Station Vehicle Repair Shop located at 720 Main Street in Haines, 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 unless new information becomes available that indicates residual contaminants may pose an unacceptable risk. This Cleanup Complete determination is based on the administrative record for the ADOT&PF Haines Maintenance Station Vehicle Repair Shop, which is located in the ADEC office in Juneau, Alaska. Bruce Wanstall

Contaminant Information

Name Level Description Media Comments
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Sample TP3 has DRO at 280 mg/kg remains at a depth of 2.5 feet below the ground surface.

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
25136 ADOTPF Haines Maintenance Station 1508.26.012

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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
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