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Site Report: Mitkof Sales & Service

Site Name: Mitkof Sales & Service
Address: 10 North Sing Lee Alley, Petersburg, AK 99833
File Number: 1521.26.011
Hazard ID: 25177
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 56.811412
Longitude: -132.958042
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

In 2007 eight test holes were dug in the vicinity of two abandoned tanks as part of a site characterization. Reportedly, four gasoline underground storage tanks (UST) remain on site - two 1,000 gallon USTs and two 500 gallon USTs. Six soil samples, ranging from a depth of 18 inches to 7 feet bgs were collected from the testholes and analyzed for GRO and BTEX. Soil samples taken at 18 inches bgs, near the fill pipe at the southern most tank indicate GRO up to 1,130.0 mg/kg, benzene up to 8.86 mg/kg, toluene up to 39.4 mg/kg, ethylbenzene up to 19.6 mg/kg, and xylenes up to 106 mg/kg. Petroleum consituents were also found down to four feet bgs. In 2008 the tanks are still in place. It was noted that the southern most tank is filled with water and partially filled with free product. The tanks were noted to be in poor condition. The northern most tank sprang a water leak on the east end, at about 30 inches bgs, when the tank was exposed. DRO was not analyzed. On April 28, 2010 five USTs were removed at this site - two 1,000 gallon gasoline tanks, two 500 gallon gasoline tanks, and one 500 gallon diesel tank. Contamination over site cleanup levels was found at all 5 tank locations in sidewalls, base of the excavations, and at a piping elbow. Up to 1.42 mg/kg benzene remains at the site. Contamination was found in samples collected at 3 feet to 8 feet below ground surface, but could be at a shallower and deeper depths as the extent of the contamination has not been defined. A hole was found in the southern wall of the western 1000 gallon gasoline tank, and several holes were observed in the east 1000 gallon gasoline tank. Seeps of contaminated groundwater with a sheen were observed at around 3 feet below ground surface at the dispenser island. Samples were collected from contaminated excavated soil had up to 6.83 mg/kg benzene, 536 mg/kg GRO, and 139 mg/kg DRO. Need to define the extent of the soil and groundwater contamination at this site and properly treat/dispose of contaminated stockpile.

Action Information

Action Date Action Description DEC Staff
8/28/2008 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77559 (Added by System) Mitzi Read
8/28/2008 Site Added to Database Former Staff
9/2/2008 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST site created in CSP database for source area USTS, 77559 Grant Lidren
9/2/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 77559 name: autogenerated pm edit - Mitkof Sales & Service Grant Lidren
9/19/2008 Update or Other Action Alaska Department of Environmental Conservation Contaminated Sites Program (ADEC) reviewed a site assessment report for regulated underground storage tanks (UST) on a property formerly operated as Mitkof Sales & Service located in Petersburg; a site file was prepared and transferred to Juneau. The UST Program has FacilityID# 2962 for the site and CSP has issued event ID#77559. Scheduled time for laboratory data report review for approval; case narrative by the laboratory is not present. Bruce Wanstall
9/22/2008 Update or Other Action ADEC completed laboratory data report review for approval; samples for volatile analysis (GRO/BTEX) were received above temperature (10degreesC) with no trip blank so data usability is biased low but served to get the site listed. Without a signed case narrative from the laboratory ADEC cannot determine with any certainty that all corrective actions taken during the analysis are documented in the report; LIMs notations are useful but not enough for unrestricted use of the data. Bruce Wanstall
12/8/2008 Update or Other Action CSP evaluated the site assessment with regard to a letter sent from the responsible party to the UST Program. UST forms were completed and submitted along with an update on non-environmental work at the site. Bruce Wanstall
1/26/2009 Update or Other Action Coordinate with UST Program manager for cleanup enforcement action to bring the operator into line with UST corrective action requirements Bruce Wanstall
4/8/2010 Update or Other Action File has been transferred to Anchorage, and site has been re-assigned to Robert Weimer. Rich Sundet
7/27/2010 Update or Other Action Have not received results of April 2010 site assessment work. UST program will be sending letter requesting copy of that report and post closure form. Robert Weimer
8/30/2010 Site Characterization Report Approved On April 28, 2010 five USTs were removed at this site - two 1,000 gallon gasoline tanks, two 500 gallon gasoline tanks, and one 500 gallon diesel tank. Contamination over site cleanup levels was found at all 5 tank locations in sidewalls and base of the excavations, and at a piping elbow. Up to 1.42 mg/kg benzene remains at the site. Contamination was found in samples collected at 3 feet to 8 feet below ground surface, but could be at a shallower and deeper depths as the extent of the contamination has not been defined. A hole was found in the southern wall of the western 1000 gallon gasoline tank, and several holes were observed in the east 1000 gallon gasoline tank. Seeps of contaminated groundwater with a sheen were observed at around 3 feet below ground surface at the dispenser island. Samples were collected from contaminated excavated soil had up to 6.83 mg/kg benzene, 536 mg/kg GRO, and 139 mg/kg DRO. Need to define the extent of the soil and groundwater contamination at this site and properly treat/dispose of contaminated stockpile. Robert Weimer
12/22/2011 Leaking Underground Storage Tank Cleanup Initiated - Petroleum Adminstrative action addition for grant reporting purposes. Evonne Reese
2/22/2012 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77559 USTs. Robert Weimer
1/31/2014 Update or Other Action Project manager changed to Amy Dieffenbacher, file transferred to Juneau Annie Ariel
3/28/2014 Potentially Responsible Party/State Interest Letter PRP/workplan request letter mailed USPS Certified to RP. Deadline for written intention to submit a workplan to ADEC is April 15, 2014. Amy Rodman
4/23/2014 Update or Other Action Received written intent to submit cleanup workplan in late 2014 via email from RP. Area around building on site has been paved since decommissioning and surface water is redirected to a storm drain system. Amy Rodman
10/8/2014 Update or Other Action DEC approves the plan to dismantle the remaining subsurface structures on the property before continuing identification and assessment of complete exposure pathways necessary to achieve closure of the site. Per details from email correspondence between ADEC, RP and RP's consultant. Amy Rodman
11/5/2014 Update or Other Action Emailed RP on October 27 to request workplan for addressing soil contamination onsite, specifically surface soils (0-2 feet below ground surface) at excavations within the shop. Teleconference with RP, RP's consultant and Bruce Wanstall to discuss objectives and analytical methods for requested workplan. Amy Rodman
11/20/2014 Update or Other Action Project Oversight transferred to Wanstall Bruce Wanstall
11/25/2014 Document, Report, or Work plan Review - other DEC approved by email, sent to City of Petersburg (CP) and Chilkat Environmental Inc. (CEI), a sampling plan to characterize soil beneath the former Mitkof Sales and Service building. Three samples and one duplicate will be collected at the saturation interface (if present) or at the clay layer, found in two previous investigations at 2 feet below the ground surface, beneath the concrete floor. One sample and field duplicate will be collected at the location of the former floor drain and two samples will be collected in borings advanced through concrete within the building footprint nearest the former UST locations. The sample and field duplicate collected at the lift/drain excavation and will be analyzed for VOC by EPA 8260, DRO by AK 102, RRO by AK 103, GRO by AK 101 and RCRA 8 metals by Method 200.8. Two samples collected in new borings under the concrete shop floor nearest the UST sites and will be analyzed for VOC by EPA 8260, and RCRA 8 metals by Method 200.8. Bruce Wanstall
12/24/2014 Document, Report, or Work plan Review - other DEC has reviewed: Site Characterization Mitkof Sales & Service (Report), dated December 18, 2014. Chilkat Environmental Inc. completed the Report documenting the results of environmental site investigation for potential impacts to subsurface soil at the referenced site, from vehicle maintenance shop appurtenances (vehicle lift and floor drains) that the Petersburg Borough Public Works is decommissioning at the inactive facility. In accordance with Title 18 Alaska Administrative Code (AAC) 78.090, qualified person(s) used data collection and field screening methods consistent with DEC methodology in conducting the site assessment, release investigation and corrective action at the site. 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. The Report is hereby approved. Bruce Wanstall
7/2/2015 Institutional Control Periodic Reporting The property must covered by asphalt cap to limit exposure routes within 15 months (by October 3, 2016). When implemented, the Borough of Petersburg (BOP)shall submit an Initial Cap Maintenance (ICM) Report with photographs documenting the condition of the asphalt cap. Every five years after the Initial Report is submitted, the BOP will submit new ICM report to the DEC. Reports may be sent the Juneau DEC office by regular mail or email to DEC.ICUnit@alaska.gov. Bruce Wanstall
7/2/2015 Institutional Control Record Established Institutional Controls established and entered into the database. Bruce Wanstall
7/2/2015 Cleanup Complete Determination Issued Based on a review of the environmental record, DEC has determined that residual contaminant concentrations pose a cumulative human health risk and control measures with institutional controls are necessary to mitigate exposure. There is no unacceptable risk to human health or the environment as long as the planned control measures are implemented and the contamination is properly managed. Bruce Wanstall
7/7/2015 Institutional Control Update Staff changed from Bruce Wanstall to IC Unit. Reminder system set to follow-up regarding the asphalt cap in October 2016. Kristin Thompson
2/25/2016 Institutional Control Compliance Review IC compliance review conducted. Responsible party contacted regarding the IC agreement and signature page. IC agreement page signed and submitted by the responsible party on this date. Kristin Thompson
8/24/2016 Document, Report, or Work plan Review - other Received a report with photos confirming that the property has been covered with asphalt and that the shop building has been removed. The property will be used as a parking lot for the municipal building. The next IC review will be due in August 2021. The reminder system has been set. Evonne Reese
8/8/2024 Institutional Control Compliance Review IC compliance review completed on this date. An IC reminder letter was e-mailed to the landowner. The next review will be in five years’ time. Gaige Robinson
8/29/2024 Institutional Control Compliance Review The landowner responded to the IC reminder letter and provided a written confirmation that land use and cap has not changed Gaige Robinson

Contaminant Information

Name Level Description Media Comments
Benzene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil

Control Type

Type Details
Institutional Control Management Plan The property must covered by asphalt cap to limit exposure routes within 15 months (by October 3, 2016). When implemented, the Borough of Petersburg (BOP)shall submit an Initial Cap Maintenance (ICM) Report with photographs documenting the condition of the asphalt cap.
Signed CS Determination Every five years the Borough of Petersburg shall report to DEC if they become aware of any change in land ownership and/or use.
Land Use Plan / Maps / Base Master Plan Any future change in land use may impact the exposure assumptions cited in this document. If land use and/or ownership changes, these management conditions may not be protective and DEC may require additional remediation and revised conditions.

Requirements

Description Details
Maintenance / Inspection Of Engineering Controls The property must be covered by asphalt cap to limit exposure routes, ADEC must be notified if any changes have occurred to the cap.
Other Notify ADEC of any changes of the land or landownership
Advance approval required to transport soil or groundwater off-site. Standard condition.
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) Standard condition.
Excavation / Soil Movement Restrictions Soil contamination is present in subsurface soil surrounding the former twin UST and fuel dispenser locations located west of the center of the property. If disturbance is planned in the areas of the property having residual contamination, a work plan must be submitted for ADEC approval prior to any such site activity begins.

No associated sites were found.

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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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