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Site Report: Mentasta Village Clinic


Site Name: Mentasta Village Clinic
Address: P.O. Box 600, Mentasta Lake, AK 99780
File Number: 210.38.002
Hazard ID: 1155
Status: Cleanup Complete
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 62.902500
Longitude: -143.748090
Horizontal Datum:

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

A history of leakage from a 300 gallon heating fuel tank located behind the clinic building and next to clinic's well house resulted in fuel contaminated soils. Spill was noted in spring of 1990 after two attempts to fill the tank were unsuccessful. Cleanup commenced. Drinking water samples from 1990 and 2002 have not shown any evidence of fuel contamination. Notice of Environmental Contamination: ADEC recommends that the residential water well established at the former tank site be monitored every three to five years for petroleum contamination, including volatile organic compounds. Some contamination likely remains in the subsurface soils at the limits of the tank excavation. Approximately 350 cubic yards of uncharacterized soils are stockpiled within the village firebreak. It is unknown to what levels the stockpiled soil is contaminated with petroleum.

Action Information

Action Date Action Description DEC Staff
5/17/1990 Update or Other Action (Old R:Base Action Code = FI - Field Inspection (General)). Morgan and Thomas visited the site in order to conduct a brief investigation and determine the extent of contamination. Ben Thomas
6/1/1990 Interim Removal Action Approved (Old R:Base Action Code = REM - Removal / Excavation). Approximately 7,000 cubic yards of contaminated soil was excavated by Mentasta Village and taken 1/4 mile away to lined and covered pits. Thomas collected water samples using EPA method 503.1 which proved to be below MCL and no floating product was observed in the well during hand bailing. Ben Thomas
6/15/1990 Update or Other Action (Old R:Base Action Code = FI - Field Inspection (General)). Using a Photo Ionization Detector (HNU) at the excavation site, Thomas found in excess of 150 ppm in vapors near the tank, but lower than 10 ppm elsewhere in the pit. Ben Thomas
7/27/1990 Site Added to Database Heating fuel. No Longer Assigned
12/5/1990 Site Ranked Using the AHRM Initial ranking. No Longer Assigned
8/24/1991 Update or Other Action (Old R:Base Action Code = RECN - Site Reconnaissance (CS)). Kalu and Noland inspected stockpiled soils which are no longer covered. 2 stockpiles located near community and school, 1 stockpile located approximately 1/2 mile away. Kalu Kalu
6/20/1994 Update or Other Action (Old R:Base Action Code = RPL2 - Site Information Request Letter). Sent PRP-CS Database Notification Letter to RP requesting update and more environmental information concerning contaminated site. Jeff Peterson
3/5/2001 Update or Other Action File number updated from 210.02.014 to 210.38.002. Mitzi Read
7/31/2006 Update or Other Action Review of file shows contamination removed from site and stockpiled 1/4 mile away. No monitoring of the stockpile has occurred. Phone conversation with Tribal Administrator Shawn Sanford confirmed that stockpiles are still intact. Letter sent requesting characterization of the stockpiled soils. Response due 9/1/06. Shannon Oelkers
3/27/2007 Exposure Tracking Model Ranking Intitial Ranking Complete for Source Area: 78182 (Autogenerated Action)
3/27/2007 Exposure Tracking Model Ranking Intitial Ranking Complete for Source Area: 78181 (Autogenerated Action)
5/1/2007 Meeting or Teleconference Held Site Visit by ADEC Staff Oelkers and Williams. The clinic building is now a residence. A private well has been installed (2005) within 50 feet of the former tank site. The stockpiles located behind the building have been removed or graded. Remnants of a tarp and possible liner material were observed at the edge of the site. The stockpile located 1/4 mile uphill from the village is centered within the firebreak. Approximately 250 cubic yards were observed. Bottom liner is compromised. Top liner is completely disintegrated. Trees, grass and shrubs all growing on top of the stockpile. Some areas of the stockpile were noticeably not overgrown by vegetation. Search of the village and conversation with city clerk Virginia John confirm that only 250 cy remain. Unsure if the origianl entry of 7,000 cy was accurate. Depth to GW is generally 180-250 feet bgs. Shannon Oelkers
5/14/2007 Exposure Tracking Model Ranking Updated Ranking Complete for Source Area: 78181 (Autogenerated Action)
5/14/2007 Exposure Tracking Model Ranking Updated Ranking Complete for Source Area: 78182 (Autogenerated Action)
5/17/2007 Conditional Closure Approved Based on the information provided to date, ADEC has determined that the cleanup actions employed at the former Mentasta Village Clinic were effective in removing the source(s) of the contamination at the site. The stockpiled soils are being beneficially used as part of the village firebreak and are located in a non-environmentally sensitive area. Shannon Oelkers
5/17/2007 Institutional Control Record Established The contamination remaining at the former tank site and in the stockpile along the firebreak does not pose an unacceptable risk to human health or the environment provided site specific conditions and/or controls are attached to the property. As a result of this determination, ADEC will require no further remedial action subject to the following conditions: 1. A Notice of Environmental Contamination will be listed on the ADEC Contaminated Sites Database identifying the nature and extent of contamination remaining on site. 2. In accordance with 18 AAC 75.370(b), ADEC approval must be obtained prior to removal and/or disposal of soil or groundwater from this site to an off-site location. ADEC recommends that the residential water well established at the former tank site be monitored every three to five years for petroleum contamination, including volatile organic compounds. Site closure (without conditions) can be achieved when soil sampling confirms that all soil meets the most stringent 18 AAC 75.341 Method Two, migration to groundwater, Under 40 Inch Zone, cleanup levels. Shannon Oelkers
9/17/2007 Update or Other Action Updated staff assigned to Bill O'Connell. Hannah Lager
6/11/2012 Institutional Control Compliance Review IC review conducted and staff name changed from Bill O’Connell to IC Unit. Evonne Reese
6/11/2012 Institutional Control Record Removed This site meets the 2009 closure policy requirements therefore ICs can be removed. The default requirement of no offsite transport of soil or groundwater from this site will still apply. Evonne Reese

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.

Missing Location Data

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