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Site Report: ADOT&PF North Kenai Maintenance Facility Class V Injection Well


Site Name: ADOT&PF North Kenai Maintenance Facility Class V Injection Well
Address: 51150 Island Lake Road, Nikiski, AK 99635
File Number: 2323.38.053
Hazard ID: 25641
Status: Cleanup Complete
Staff: ,
Latitude: 60.721118
Longitude: -151.319510
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 facility was constructed in 1967, with a five bay floor drain shop. The waste water was plumbed through a two compartment oil/water separator prior to connecting with the facility's septic tank soil absorption system comprised of a septic tank that discharged to a log crib seepage pit, classified by EPA as a Class V Injection well. In 2009 this system failed and was taken out of service. In the interim the septic tank was used as a holding tank and routinely pumped by a local septage hauler. In 2010 a new septic tank soil absorption system was constructed. After completing the new system on August 23 and 24 of 2010 the Class V Injection Well (seepage pit and associated structures) was excavated and removed. Petroleum contamination was observed during the removal of the structure, both from the solid material within the seepage pit and in the soil surrounding the seepage pit. Approximately 120 cubic yards of contaminated soil was removed and was stockpiled at the site. The total depth of the excavation was at 17.5 feet below ground surface, with confirmation soil samples taken from the excavation confirmed that the petroleum contamination had been removed. Arsenic was detected within the limits of the excavation at concentrations of 3.32 to 5.44 mg/kg. The confirmation stockpiled soils samples detected DRO at 254 to 624 mg/kg and Arsenic at 4.04 to 4.83 mg/kg.

Action Information

Action Date Action Description DEC Staff
4/13/2011 Site Added to Database A new site has been added to the database Alyce Hughey
4/13/2011 Update or Other Action File number 2323.38.053 was assigned and entered into the Fileroom Database. Alyce Hughey
4/13/2011 Site Characterization Report Approved Reviewed Injection Well Closure Report. Don Fritz
4/13/2011 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79073 name: Class V Injection Well Don Fritz
6/16/2011 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79073 Class V Injection Well. Don Fritz
11/16/2011 Update or Other Action Site transferred from Don Fritz to Peter Campbell per Paul Horwath. Alyce Hughey
4/3/2012 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79073 Class V Injection Well. Paul Horwath
4/4/2012 Update or Other Action After discussing the project status with former CSP manager Don Fritz, it appears the stockpiled soils may not have been landspread. ADEC needs to coordinate with ADOT&PF for the spreading of the stockpiled soils, and then we should be able to issue a cleanup complete decision letter. Paul Horwath
4/11/2012 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79073 Class V Injection Well. Alyce Hughey
4/12/2012 Cleanup Complete Determination Issued Cleanup Complete Determination Issued. Approximately 120 cubic yards of stockpiled contaminated soil remains on site. Based on the soil concentrations within the stockpile, the soils must now be spread on this property in an upland area at least 100 feet from any drinking water well and any surface water. The soil shall be spread on the ground surface in a lift that is no more than six inches thick, to facilitate biodegradation of any residual DRO contamination. The Alaska Department of Transportation shall provide written documentation of the date and the location where the soils were spread on the property to ADEC following the spreading of the soils, by August 1, 2012. Peter Campbell

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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