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Site Report: Former Interior Texaco/Alaska Mechanical

Site Name: Former Interior Texaco/Alaska Mechanical
Address: 1600 Richardson Hwy, Delta Junction, AK 99737
File Number: 120.26.001
Hazard ID: 22862
Status: Cleanup Complete - Institutional Controls
Staff: Shawn Tisdell, 9074512752 shawn.tisdell@alaska.gov
Latitude: 64.041180
Longitude: -145.733889
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

The former underground storage tank (UST) system consisted of three dispensing islands, a loading rack, and four USTs (one 12,000-gallon diesel tank and three 12,000-gallon tanks containing gasoline products). Extensive diesel range (DRO) and gasoline range organics (GRO) and benzene contamination was found on-site from 15 feet below ground surface (bgs) to 30 feet bgs. A class B drinking water well (Kelly's Country Inn) was located less than 30 feet from the contamination. The facility is currently operated under the name Buffalo Center Service.

Action Information

Action Date Action Description DEC Staff
10/23/1989 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 78451 ADD; Former Staff
10/23/1989 Site Added to Database Former Staff
1/9/1994 Update or Other Action RPL2; Peterson sent PRP-CS Database Notification Letter to RP requesting update and more environmental information concerning contaminated site. RP rec'd letter, but as of this "complete date" no response. Former Staff
6/6/1994 Update or Other Action CORR; Wingerter sent letter informing RP of their financial liability under new ADEC cost recovery policy. State is authorized, under Section 9003(h) of the Resource Conservation and Recovery Act to take action on this LUST facility. Former Staff
7/18/1995 Release Investigation SI; DEC reviewed tank removal report for Alaska Mechanical Fuel Services. Shannon and Wilson to ensure integrity of the building placed contaminated soil in the excavated area and covered it with liner. 60 cubic yards of gravel is stockpiled at the site. DEC requested a monitoring of a nearby drinking water well. S&W will submit a in-situ cleanup plan. Former Staff
5/10/1996 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU; Removal of four USTs and 60 cubic yards of contaminated soil - stockpiled on site. Former Staff
11/20/1997 Potentially Responsible Party/State Interest Letter ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: ALASKA MECHANICAL Former Staff
5/1/1998 Release Investigation Release investigation submitted. Four borings were installed. Gasoline and diesel contamination were found extending beyond the former excavation limits to a depth of at least 36 feet directly under the former tanks and dispensers. Contamination may extend beneath the building. Groundwater was observed but is believed to be perched water. A drinking water sample collected at the adjacent motel was not contaminated. Janice Wiegers
6/25/1999 Leaking Underground Storage Tank Corrective Action Underway Corrrective action plan submitted. Plan includes design for passive vapor extraction (PVE), groundwater quality assessment, indoor air quality assessment, landfarming of the existing soil stockpile. Janice Wiegers
1/31/2000 Update or Other Action Corrective action summary submitted. Toluene was detected in indoor air samples from the shop, but the levels were generally below OSHA standards for fuel facilities. The drinking water well at the adjacent motel was sounded. The drinking water aquifer appears to be at least 70 feet deeper than the peviously observed perched water. Janice Wiegers
11/9/2000 Update or Other Action Corrective action progress report submitted. Six additional passive vapor extraction wells were added to the two that were intalled during the release investigation. Janice Wiegers
1/8/2002 Update or Other Action Corrective action progress report submitted. Janice Wiegers
1/23/2002 Update or Other Action ADEC Drinking Water Program sends letter reducing requirement for sampling drinking water well at adjacent hotel to once per year. Janice Wiegers
8/24/2005 Update or Other Action ADEC Drinking Water Program indicated that water results from the Kelly's well were non-detect for BTEX in both 2003, 2004 and 2005. Deborah Williams
4/9/2007 Exposure Tracking Model Ranking Initial ETM ranking complete Evonne Reese
5/9/2008 Update or Other Action Letter sent to RP requesting current status of site. No additional information has been received since 2005 request for NFRA. Tamara Cardona-Marek
5/23/2008 Update or Other Action Received call from RP. Will send recent sample results from Kelly's well and arrange to collect confirmation samples this year. Tamara Cardona-Marek
1/13/2009 Update or Other Action Project update for site was received and reviewed by DEC. Vapor intrusion exposure pathways remain at the site and soil between the Interior Texaco building and Kelly's Country Inn should be screened for vapors. Additional soil samples should be collected along the north property line. Additional sampling of the landspread soil is not needed and no further action is required for the stockpile. Tamara Cardona-Marek
5/22/2009 Update or Other Action DEC received Shannon and Wilson's proposal to CEM Leasing for additional site characterization at the Interior Texaco site. Tamara Cardona-Marek
3/30/2010 Update or Other Action ADEC received Shannon & Wilson's Site Characterization Report and Request for Cleanup Complete with Institutional Controls Status. Amy Rodman
4/7/2010 Update or Other Action LUST site created in CSP database for source area USTs, 78452 Tamara Cardona-Marek
6/16/2014 Potentially Responsible Party/State Interest Letter PRP letter mailed to Mr. Weymiller with CEM Leasing, Inc. (Received 6/24/14) Amy Rodman
6/30/2014 Update or Other Action Emailed RP request for workplan. Amy Rodman
12/1/2015 Update or Other Action Sent follow up email request for WP review for next field season. John Carnahan
12/17/2015 Meeting or Teleconference Held Meeting with RP and consultant to discuss the need for historical review of outstanding issues that preclude closure with ICs. Consultant to review history and provide summary of data gaps and recommend proposed course of action to help establish closure criteria. John Carnahan
8/12/2016 Meeting or Teleconference Held Meeting with RP and RP's consultant to discuss prior draft workplan, and to formulate approach to address future assessment, to include delineation of horizontal and vertical extent, and potential SVE evaluation of effectiveness of historic passive SVE cleanup. John Carnahan
9/12/2016 Site Characterization Workplan Approved Workplan to investigate soil and groundwater at site approve - Revised Work Plan, Interior Texaco (Buffalo Service Center), Limited Site Characterization, Delta Junction, Alaska, September 2016 John Carnahan
12/2/2016 Document, Report, or Work plan Review - other Provide interim comments to 2016 RI report, with response to closure request to follow. John Carnahan
12/5/2016 Potentially Responsible Party/State Interest Letter PRP letter sent to current owner of property. Letter followed with explanation letter regarding coordination on long-term site management. John Carnahan
2/28/2017 Document, Report, or Work plan Review - other DEC Comments – DRAFT Site Characterization Report, Delta Junction, Alaska, October 2016 provided to RP and consultant. Include detailed analysis of closure request. John Carnahan
7/26/2017 Meeting or Teleconference Held Meeting with property owners to discuss status of site, and review Site Closure Checklist and DEC review of 2016 investigation. John Carnahan
8/29/2017 Meeting or Teleconference Held Meeting with RP consultant to discuss work plan for 2017 release investigation. John Carnahan
6/18/2018 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 80239 name: Garage Floor Sub-Slab John Carnahan
6/22/2018 Document, Report, or Work plan Review - other Provided review comments on Work Plan and FS report with approval to move forward. John Carnahan
2/5/2019 Update or Other Action Provide comments on GW monitoring and SVE testing report for work completed during 2018. John Carnahan
4/22/2019 Document, Report, or Work plan Review - other Provide review and comments for 'Final Groundwater Monitoring and SVE Feasibility Study Report, Interior Texaco, Delta Junction, Alaska, March 2019. John Carnahan
7/15/2019 Risk Assessment Workplan Approved Approval to proceed with work as outlined in the July 9, 2019 final work plan addendum. The proposed work includes conducting another air-sampling event to evaluate the vapor intrusion pathway, decommissioning the eight remaining groundwater-monitoring wells, transporting and disposing of five drums of soil cuttings from previous site work and preparing a report summarizing the proposed activities. Shawn Tisdell
1/22/2020 Document, Report, or Work plan Review - other DEC received 2019 Summary Report presenting results for 2019 activities including a vapor intrusion assessment and well decommissioning activities. Justification for site closure was also presented. Shawn Tisdell
10/30/2020 Cleanup Complete Determination Issued Shawn Tisdell
10/30/2020 Institutional Control Record Established Institutional Controls established and entered into the database. Shawn Tisdell
10/30/2020 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78452 USTs. Shawn Tisdell
1/7/2022 Institutional Control Update A catastrophic roof collapse occurred at the Buffalo Service Center and a Notice of Building Rehabilitation/Reconstruction was provided to the ADEC in accordance with the Activity and Use Limitations set forth in the Environmental Covenant that is attached in this database. The ADEC will work with the responsible party to minimize potential exposure of workers or other building occupants to contamination remaining at the site. Shawn Tisdell
8/17/2022 Institutional Control Compliance Review All ICs are in compliance. DEC is working with RP to maintain IC compliance as the shop/garage is being rebuilt following the roof collapse that occurred during the winter of 2021/2022. Shawn Tisdell
9/1/2022 Site Characterization Workplan Approved Following the 12/2021 roof collapse of the shop, debris has been removed and replacement is planned for the Fall of 2022. To comply with institutional controls, the RP has contracted with an environmental consultant to guide screening, sampling and handling of potentially contaminated soil beneath the former shop and remove obviously contaminated soil if necessary. Most of the subslab soil will not be disturbed, however a 40 foot trench needs to be temporarily excavated to replace the damaged septic line. This excavated soil will be temporarily stockpiled and returned to the excavation if no field evidence of contamination. If evidence of contamination, the soil will be stockpiled and sampled to determine treatment and/or disposal options. Field screening and analytical samples will be collected. Work is scheduled for September 2022. Following the sampling event, a sampling report will be submitted to the DEC. Shawn Tisdell
6/16/2023 Site Characterization Report Approved On May 12, 2023, the DEC received a Summary Report for Buffalo Center Service, titled “2022 Environmental Services-DEC”. This report summarized the September 2022 characterization of soils underlying the shop at the Buffalo Center Service building in accordance with institutional controls that had been placed on the location in October 2020 to manage future exposure risk of contamination remaining on the site. Field screening and analytical samples were collected from the soil surface after the slab was removed and from the excavation trench sidewalls and base before the new septic line was installed. Diesel range organics (DRO) and tetrachloroethene were detected at levels up to 9,050 mg/kg and 0.565 mg/kg respectively in the excavation and in the stockpile at up to 2,010 mg/kg. These levels are above migration to groundwater cleanup levels, but below inhalation/ingestion and human health levels. A sub-slab depressurization system and a vapor barrier (W.R. Meadows PERMINATOR® HP 15 Mil Underslab Vapor Barrier) were installed during shop reconstruction. The 11 cubic yard stockpile remains on site and will require additional management. Shawn Tisdell

Contaminant Information

Name Level Description Media Comments
1-Methylnaphthalene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
2-Methylnaphthalene 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
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
GRO > Human Health/Ingestion/Inhalation Soil
Ethylbenzene > Human Health/Ingestion/Inhalation Soil
Naphthalene > Human Health/Ingestion/Inhalation Soil
Xylenes (total) > Human Health/Ingestion/Inhalation Soil

Control Type

Type Details
Environmental Covenant An Environmental Covenant has been approved by all affiliated parties and has been recorded in the land records maintained by the Alaska Department of Natural Resources

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)
Excavation / Soil Movement Restrictions Excavation, drilling, and other intrusive activities below a depth of 1.5 feet within the area of possible soil contamination delineated in Figure 1 of the Closure letter are prohibited, without prior review and approval from ADEC.
New Construction Restrictions If the use of the building changes, or if other buildings are proposed for construction within the contaminated area, ADEC must be notified in advance and may require a vapor intrusion evaluation to determine if building occupants could be affected by vapors.
When Contaminated Soil is Accessible, Remediation Should Occur In the event that the remaining contaminated soil becomes accessible in the future due to the building being removed, the landowner shall notify ADEC and characterize and, if determined necessary, cleanup the soil.
Maintenance / Inspection Of Engineering Controls The Buffalo Service Center garage floor slab must be maintained to prevent intrusion of soil vapors from beneath the slab into the garage workspace. Any damage to the garage floor that would allow vapors from the soil to move into the workspace shall be reported to DEC within ten (10) days after discovery and shall be promptly repaired. Documentation of the repairs shall be submitted to DEC within 30 days.
Groundwater Use Restrictions No groundwater wells shall be installed in the area covered by the activity and use limitations without prior ADEC approval.
New Construction Restrictions The Property shall not be used for residential purposes including use for child day care, educational facilities, playgrounds, hospitals or similar facilities, without prior review and approval from ADEC.
Subdivision Restriction ADEC must be notified in advance of the subdivision or replat of the Property associated with these activity and use limitations. This covenant must be included as part of future property transactions and attached to subsequent associated parcels, as determined applicable by ADEC.
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.
Other Protection of Human Health, Safety, Welfare and of the Environment. The Grantor shall not engage in any activity on the Property that may threaten continued protection of human health, safety, welfare or of the environment without prior written approval from ADEC. This includes, but is not limited to, any activity that results in the release of residual contamination that was contained as part of the remedial action or that creates a new exposure to residual contamination remaining on the Property.
Hazard ID Site Name File Number
27842 Buffalo Center Service UST Facility 125 120.26.018

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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