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Site Report: ADOT&PF Livengood Maintenance Station


Site Name: ADOT&PF Livengood Maintenance Station
Address: MP 71 Elliot Highway, Livengood, AK 99730
File Number: 180.26.005
Hazard ID: 23190
Status: Active
Staff: Laura Jacobs, laura.jacobs@alaska.gov
Latitude: 65.522454
Longitude: -148.549589
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

Emcon removed four UST's in 1998 and 1999. The tanks were described as follows: tank #2, 2,000 gallon diesel, tank #6, 500 gallon used oil, tank #7, 3,000 gal diesel, tank #8, 500 gallon used oil, and tank #9, 500 gallon used oil. The tanks were reported to be in good condition. 40 cubic yards of soil was stockpiled at the site. DRO in the soil beneath the tanks ranged from 821 to 18,800 mg/kg, RRO up to 73,300 mg/kg, and benzene up to 0.046 mg/kg. Arsenic, cadmium and chromium were also detected. The maintenance station is built on a gravel pad constructed of mine tailings, and the metals may be considered background for the area. Shannon Wilson preformed a release investigation in 2002. The primary contaminants of concern at the site are DRO and RCRA metals in the soil and perched groundwater table at the site.

Action Information

Action Date Action Description DEC Staff
7/27/1998 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77966 (Added by System) * Not Assigned
7/27/1998 Site Added to Database * Not Assigned
1/22/1999 Underground Storage Tank Site Characterization or Assessment Submitted by Emcon. Summarizes removal of 4 USTs. Approximately 50-cubic yards of material stockpiled onsite. John Carnahan
3/22/1999 Leaking Underground Storage Tank Cleanup Initiated - Petroleum Report summarizing closure of USTs #2, 6, 7, and 8 received on this day. Approximately 50 cy of soil was excavated in order to remove the tanks. No additional contaminated soil was excavated. No groundwater was encountered in the excavations which extended to a maximum depth of 6 feet. John Carnahan
1/3/2000 Underground Storage Tank Site Characterization or Assessment Additional assessment received for the removal of UST #9. Emcon provided report. Ten cubic yards of material were removed at this time. John Carnahan
8/21/2002 Update or Other Action RECKEY has automatically been generated. Cynthia Pring-Ham
1/28/2004 Update or Other Action Transferred DEC staff lead from John Carnahan Cynthia Pring-Ham
12/14/2004 Report or Workplan Review - Other Received and reviewed Shannon and Wilson report dated Feb. 2003. Report outlines remedial investigation of contaminant levels in soil, drinking water well and perched groundwater table. Downward migration of contaminant is limited by a silt layer. 30 cubic yards of soil was stockpiled, but the excavation was limited by proximity to buildings. Contamination remains in the soil beneath all of the former tanks, and has migrated under the buildings due to a perched water table. Shannon and Wilson installed 5 monitoring wells (MW’s) at the site, several samples from these MW’s did exceed DRO clean up levels. The report recommends continued monitoring and possible vapor extraction of soil around the buildings. Updated GIS. Kim DeRuyter
9/21/2005 Report or Workplan Review - Other Groundwater Sampling report received. DRO still exceeds cleanup levels in MW-3, in addition, metals analysis of groundwater samples show exceedences for lead and arsenic. These analytes could be due to tailings used to construct the gravel pad. No PAH analytes were recorded above cleanup levels. Shannon & Wilson reccommends further monitoring, as all accessible source material has been removed. Kim DeRuyter
8/30/2006 Site Visit PM accompanied Mark Lockwood (S&W) and Darren Mulkey (ADOT M&O) on a site visit of the facility. The old USTs were converted to AST which do not appear to meet current regulations. In addition to the former UST's, an out of service buried heating oil tank (HOT) may be contributing to groundwater contamination at the site. The HOT was not removed during previous site work because a corridor connecting the two shop buildings was constructed over the top of it. Kim DeRuyter
10/9/2006 Update or Other Action Received updated site history from Darren Mulkey: Sometime in the early 1990's a fuel delivery person mistook the drinking water well for a heating oil tank and put a truck load(?) of fuel into the well. ADOT drilled the present drinking water well upgradient of the site. It was recently discovered that the new well is not on State property. The property owner wants ADOT to quit using the well. Kim DeRuyter
1/31/2007 Report or Workplan Review - Other 2006 Groundwater monitoring report received. MW-1, and MW-2 continue to detect petroleum hydrocarbon contamination below the clean up levels. MW-3 downgradient of the backup generator buildings contained 25 mg/L DRO. MW-4, and MW-5 had slight exceedences for DRO as well. Arsenic, Cadmium and Lead also exceed cleanup levels in groundwater in MW-3. The facility is built on mine tailings and it has not been established whether these contaminants are from activities at the site. Kim DeRuyter
4/7/2008 Exposure Tracking Model Ranking Intitial Ranking Complete for Source Area: 77966 (Autogenerated Action)
9/25/2008 Update or Other Action Project manager changed to Everson and file transferred to Fairbanks. Linda Nuechterlein
4/20/2009 Cleanup Assumed by ADEC Submitted RFP for summer 09 work. Include sampling of monitoring wells, historical records search, a CSM, remedial options/ long term management goals, etc. Neal Everson
10/16/2009 Site Characterization Workplan Approved Reviewed workplan from Shannon & Wilson. Workplan for groundwater sampling and CSM approved. Janice Wiegers
10/26/2009 Update or Other Action Changed project manager from Neal Everson to Janice Wiegers Janice Wiegers
7/7/2010 Site Characterization Report Approved Received Summary Report for groundwater smapling at the Livengood Maintenance Station from Shannon & Wilson. MW-1 was not destroyed. The shop sink and new drinking water well were smapled along with the remaining monitoring wells. DRO remains above groundwater cleanup levels in MW-3 at 11.1 mg/L. Arsenic and lead were found in MW-3, MW-5, and the new water well at concentrations above groundwater cleanup levels. S&W suggested metal concentrations may be more elevated in wells with high turbidity and recommend filter samples for comparison. A long-term management plan was developed that recommends annual groundwater monitoring until DRO is below cleanup levels. S&W also recommend characterizing soil in the area of two recently removed ASTs and two ASTs planned for removal in 2010, developing a corrective action plan for soil near former USTs #2 and #7, and sampling the well at the northern property boundary again and decommissioning if appropriate. Janice Wiegers
2/18/2011 Meeting or Teleconference Held DEC staff met with DOT staff (Clark Milne and Sam Meyers) about the groundwater monitoring and long-term management plan completed in 2009. Janice Wiegers
7/28/2011 Update or Other Action DEC contracted with Shannon & Wilson to collect groundwater samples, sample two on-site drinking water wells (new well and an unused well), and characterize soil south and east of the generator building where leaks or spills are suspected to have occurred from ASTs. The ASTs east of the generator building were located where former USTs #2 and #7 were located, thus any contamiantion is comingling. Janice Wiegers
7/26/2012 Meeting or Teleconference Held Met with Sam Myers (DOT), Jeff Russell (DOT Dalton District), and DEC term contractor (Rodney Guritz; S&W) to discuss planned sampling at the Livengood Maintenance Station. Two drinking water wells were installed for the facility, but were capped and are not being used because of the iron content. Drinking water is currently coming from off-site under an agreement with the adjacent property owner. The station may be moved in the future due to permitting issues associated with mining exploration by Talon Gold. The ASTs east of the shop where S&W plans to sample have not been moved yet, but DOT will coordinate with S&W on moving them. DOT stopped using the tanks because fuel inventories indicated 120 gallons was missing and it was not clear if the tanks leaked or if fuel was stolen. Janice Wiegers
10/10/2012 Site Characterization Workplan Approved Shannon & Wilson submitted workplan to excavate 15 test pits in the areas of the generator building and former fuel dispenser/ASTs, sample the former(unused) on-site water supply well northeast of the facility, and sample three existing monitoring wells. DEC approved workplan with additional request for PAH analysis in fuel dispenser area. Janice Wiegers
10/16/2012 Update or Other Action Shannon & Wilson notified DEC that they are attempting to dig test pits in Livengood, but the ground is too frozen, even with an ice bucket. DEC approves changing the scope to bring out a drill rig to collect samples instead of using test pits. S&W also indicated the water table in the unused drinking water well is possibly more than 200 feet below ground surface, confirming that the monitoring wells are installed in a perched aquifer seperate from the drinking water aquifer. Due to the depth of the water in the unused drinking water well, DEC approves not sampling it. Janice Wiegers
6/21/2013 Update or Other Action Shannon & Wilson submitted Site Characterization and Groundwater Monitoring Report. Janice Wiegers

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details

Requirements

Description Details

There are no documents for this site report.

Missing Location Data

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