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Site Report: Mentasta Lodge


Site Name: Mentasta Lodge
Address: MP 78.1 Tok Cutoff Highway, Gakona, AK 99586
File Number: 210.26.002
Hazard ID: 24778
Status: Cleanup Complete
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 62.888757
Longitude: -143.678746
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

One 5,000-gallon unleaded gasoline UST and one 1,000-gallon diesel automotive fuel UST (Facility ID 1936, Tanks #1 and #2, resp.) and a fuel island located over the top of the gasoline UST were removed from this site on May 12, 1998. Hydrocarbon contaminated soil was apparent in the vicinity of both UST's. 175 cubic yards of soil was excavated and placed in a lined land farm cell onsite. Gasoline contaminated soil remained at the limits of the excavation. A soil vapor extraction system was placed in the excavation along with a new 6,000 gallon UST. Blower for vapor extraction system was never installed. Land farm cell is overgrown but intact. It has been turned several times. Excavation to 16' bgs did not encounter GW. VOC sampling results for the on-site PWS DW well #380400, Transient Non-Community (Formerly Class B), requested in 2006 as part of the conditional closure were received on 10/12/10 and below cleanup levels.

Action Information

Action Date Action Description DEC Staff
5/13/1998 Site Added to Database Steve Bainbridge
5/13/1998 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77247 Steve Bainbridge
7/1/1998 Report or Workplan Review - Other Reviewed the Gilfilian "Site Assessment of UST System Closure" report dated June 9,1998. A 5,000-gallon steel gasoline UST, a 1,000-gallon steeel diesel UST and realted fuel island, and dispensers were removed on 5/12-13/98. Fuel odor detected, contaminated soil around the diesel UST was limited to the fill end of the diesel UST, and extensive contamination was discovered all around the gasoline UST. ~50 c.y. of contaminated soil was removed from around the diesel UST varying from 13-16' bgs. Excavation samples 6' beneath the UST for DRO indicated 10.5 mg/kg DRO. No other contaminants analyzed for. ~125 c.y. of contaminated soil was excavated during removal of the gasoline. Based on a test hole in the most contaminated area to ~16' bgs, gasoline contamination may extend to 16-20'bgs. An indetermninate amount of gasoline contaminated soil remains in the undisturbed soil beyond the limits of the UST excavation. SVE treatment pipes were installed in the excavation. Gas UST samples analyzed for GRO and BTEX. An excavation sample taken at 12" below the vent end of the gas UST (3' south of the UST), at ~11' bgs resulted in exceedance of the cleanup levels of GRO at 690 mg/kg, benzene at 1.49 mg/kg, and Total BTEX at 174.2 mg/kg. A second sample taken at 16' bgs beneath the gas UST from a deeper test hole resulted in exceedance of the cleanup levels of benzene at 0.171 mg/kg and Total BTEX at 11.13 mg/kg. Permission was granted and a contaminated soil landfarm was created out of the 175 c.y. total excavated contaminated soil from both USTs. Landfarm samples exceeded the cleanup levels of GRO at 1,600 mg/kg, DRO at 642 mg/kg, benzene at 0.586 mg/kg, and Total BTEX at 365 mg/kg. Sent a letter this date indicating that the Department looks forward to your submission of a corrective action plan which will address the design and completion of the SVE system for treating the contaminated soil that was not excavated and placed in the soil landfarming cell, as well as the plans for operation of the landfarming activity. Steve Bainbridge
8/24/1998 Leaking Underground Storage Tank Corrective Action Underway Steve Bainbridge
8/24/1998 Leaking Underground Storage Tank Cleanup Initiated - Petroleum Site assessment received June 1998. Cynthia Pring-Ham
10/5/1998 Update or Other Action Received a letter dated 9/30/98 from Gilfilian Engineering that indicated on 5/11/98 Mr. Gilfilian checked the condition of the landspread contaminated soil in the treatment cell. Several shallow test pits were dug in the 6-12" thick landspread soil. The soil samples collected from the test pits appeared to be relatively clean based on visual and olfactory appearances. Steve Bainbridge
8/21/2002 Update or Other Action RECKEY has automatically been generated. Cynthia Pring-Ham
3/23/2005 Report or Workplan Review - Other Update GIS (Topozone Pro) and problem statement. Kim DeRuyter
5/15/2006 Update or Other Action Current owner Linda Lester, Mentasta Lodge LLC. Current status of site: vent pipes still in place, blower motor never installed. Earthquake in 2002 did not cause damage to existing piping or tank. Drinking water has not had BTEX detected in it. Drinking water well is several hundred feet from site. Landfarm cell is intact, but overgrown. Owner has turned it several times. Shannon Oelkers
6/9/2006 Institutional Control Record Established Contaminated soil remains on site up to 11 feet below ground surface. Gasoline range organics (GRO) levels remained at up to 690 milligrams per kilogram (mg/kg). Approximately 175 cubic yards of contaminated soil was excavated and landfarmed on site. The initial contaminant levels identified 1600 mg/kg GRO, 0.586 mg/kg benzene, and 365 mg/kg total Benzene, Toluene, Ethylbenzene, and Xylene (BTEX) in the stockpiled soil. In 2006 ADEC approved use of the soil in non-environmentally sensitive areas. In accordance with 18 AAC 78.274(b), ADEC approval must be obtained prior to removal and/or disposal of soil from this site to an off-site location. The drinking water well shall be sampled in 2006 for volatile organic carbons (VOCs) to ensure groundwater quality is not impacted by the remaining soil contamination. Please use the EPA Method 524.2 to properly analyze the quality of the groundwater. The results of this sample will be analyzed (by ADEC) prior to determining if future monitoring is required Shannon Oelkers
6/9/2006 Conditional Closure Approved Based on the information provided to date, ADEC has determined that the cleanup actions employed at the Mentasta Lodge have been effective in removing the majority of the contamination at the site. The contamination remaining on site does not pose a risk to human health or the environment provided site specific conditions and/or controls are attached to the property. Furthermore, the landfarm soil has been treated over the years and the nature of the contamination (GRO and BTEX) is amenable to natural degradation over time. It is assumed the landfarmed soil does not pose a risk and is approved to remain on site. As a result of this determination, ADEC will require no further actions subject to institutional controls established in the ADEC database. Shannon Oelkers
8/12/2010 Update or Other Action A file review indicated that the condition of closure to submit drinking water well analytical results for 2006 has not yet been fulfilled. Bill Petrik
9/7/2010 Update or Other Action Review of the site file indicated that the last record in the file was a Corrective Action Complete with ICs letter dated 6/9/06. One of the conditions of the closure was, “The drinking water well shall be sampled in 2006 for VOCs to ensure groundwater quality is not impacted by the remaining soil contamination. Please use the EPA Method 524.2 to properly analyze the quality of the groundwater. The results of this sample will be analyzed (by ADEC) prior to determining if future monitoring is required.” The file for this site does not indicate that the requested results were provided to the CSP. In addition, a search of the ADEC/EH/Drinking Water Program, Drinking Water Watch DB for any data to satisfy this request was performed but no applicable results were found. Therefore, as a follow up to the closure condition, the CSP sent a letter requesting a copy of these results. The letter also indicated that if the sampling has not yet been performed, the CSP requested a schedule to perform the sampling as soon as possible and submit the results to the CSP by 11/15/10. Bill Petrik
11/8/2010 Report or Workplan Review - Other Reviewed the on site drinking water well analytical results via Method 524.2. The laboratory information indicated that the sample for the public water supply well (PWS #380400) was taken at the kitchen sink. In recent communications with Ellen Williams of the ADEC, DEH, Drinking Water Program in Fairbanks, who performed a Sanitary Survey on 9/2/10, and Linda Lester, lodge owner, both indicated that there were no filters or conditioners located prior to the sampling point. Review of the analytical results using EPA Method 524.2 indicated only two detections. Chloroform (trichloromethane) and Total THM (trihalomethane) were both detected at 0.59 ug/l. These detections are below the 18 AAC 75.345 Table C cleanup levels of 140 ug/l, and 10 ug/l, respectively. Sent a letter this date indicating that based on review of these analytical results, further sampling of the drinking water well as a condition of the June 9, 2006 letter is relieved by the CSP. However, please be advised that the remainder of conditions in that letter are still applicable. Bill Petrik
2/2/2011 Update or Other Action Changed the name in the CSP database for the source area from "autogenerated - Mentasta Lodge" to "5,000-Gallon Unleaded Gasoline & 1,000-gallon Diesel USTs". Added DRO to the list of Contaminants of Concern (COC) based on stockpiled soil analytical sample results and cleanup levels established for the site at that time. Deleted total xylenes from the site COCs as there was not an established level for them at the time the site was closed. Bill Petrik
2/4/2011 Potentially Responsible Party/State Interest Letter The department cost recovery threshold for this site was exceeded and a PRP letter was sent out this date. Bill Petrik
2/16/2012 Update or Other Action Staff changed from Bill Petrik to IC Unit. Kristin Thompson
7/9/2013 Institutional Control Compliance Review IC review conducted and removed drinking water monitoring effective 2010. Evonne Reese
7/9/2013 Institutional Control Record Removed The conditions at this site meet the 2009 closure policy, therefore ICs can be removed. The default requirement of no offsite transport of soil or groundwater will still apply. In accordance with 18 AAC 78.276(f)(2), ADEC may require additional site assessment, monitoring, remediation, and/or other necessary actions at this facility should new information become available that indicates contamination at this site may pose a threat to human health or the environment. Evonne Reese

Contaminant Information

Name Level Description Media Comments
BTEX < Table C Groundwater

Control Type

Type Details
No ICs Required

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.

Missing Location Data

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