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Site Report: ADOT&PF Wrangell Airport Sand and Chemical Bldg

Site Name: ADOT&PF Wrangell Airport Sand and Chemical Bldg
Address: Airport Road; South of Wrangell Airport, Wrangell, AK 99929
File Number: 1529.38.023
Hazard ID: 26004
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229
Latitude: 56.482490
Longitude: -132.374855
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.


On October 10, 2012, R&M Consultants Inc performed an environmental assessment in conjunction with the ADOT&PF closure of a Class V Injection Well at the Wrangell Airport Sand and Chemical Building. The Class V well was part of a oil-water separator system was reportedly taken out of service in 2001. In the attempt to access the subsurface to decommission the Injection Well system, ADOT&PF was able to determine that a septic drain field had been built over the top of the old system. ADOT&PF advanced an investigation pit at the edge of the existing system and was able to determine that petroleum contamination was present on both the west and east walls of excavation. Further excavation was prohibited by new drain field structure. Laboratory analysis of soil samples collected in the west wall of the investigation pit detected DRO levels at 4,480 mg/Kg and RRO levels at 16,200 mg/Kg; soil samples collected in the east wall had levels of DRO in soil at 2,180 mg/Kg. Soil from the investigation pit was stockpiled between liners on site. Laboratory analytical results on soil samples collected from the on-site stockpile were below cleanup levels. DEC approved disposal of the soil as cover material at the local landfill in Wrangell. Accessible soil contamination was removed during the 2012 Class V injection well decommissioning but the injection well effluent pits and soil contamination remained under the septic mound. Since groundwater flows to the northeast, monitor wells MW02 and MW03 downgradient of the septic mound adequately characterize the mobility of remaining soil contamination. DRO and RRO concentrations in the groundwater samples from all three wells were below the laboratory reporting limit, and the respective Method Two Table C cleanup levels.

Action Information

Action Date Action Description DEC Staff
2/12/2013 Spill Transferred from Prevention Preparedness and Response Program Spill transferred by PERP staff Crystal Smith. Spill no. 12119928201; spill date = 10/8/12; substance = petroleum; quantity = unknown; source = Class V injection well. Mitzi Read
2/19/2013 Site Added to Database A new site has been added to the database Mitzi Read
2/19/2013 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79406 name: Class V Injection Well Mitzi Read
4/24/2013 Meeting or Teleconference Held Contaminated Sites Program project managers attended a meeting with Scott Gray and Kris Benson at the Southeast Regional Office in Juneau to discuss the dismantling of Class V Wells at ADOT&PF facilities and agreements made between ADOT&PF and EPA Compliance Office for the federal Underground Injection Well Program. The discussion covered two ADOT facilities in Southeast Alaska: Skagway and Wrangell where petroleum release from each of the systems is confirmed by validated soil data. Bruce Wanstall
4/25/2013 Report or Workplan Review - Other DEC has reviewed: Class V Injection Well Closure Report Wrangell Airport Sand and Chemical Storage Building Wrangell, Alaska (Report), dated January 30, 2012. R&M Consultants Inc. (R&M) completed the report documenting environmental assessment at the Wrangell site during a project to decommission a Class V Injection Well System.The site activity met the objectives of the project and review of the sample collection found that the number of representative samples collected is acceptable and the precision, accuracy and completeness of the resulting analytical data is generally sufficient to support the decision making process. In accordance with Title 18 Alaska Administrative Code (AAC) 75.360, qualified person(s) used data collection and field screening methods consistent with DEC methodology. Based on information in the Report, with the exception of the field preservation of volatile soil samples, the data meet field and laboratory report quality assurance criteria in Contaminated Sites Program guidance documents, therefore the Report is approved in accordance with 18 AAC 75.335(d). Bruce Wanstall
6/14/2013 Update or Other Action R&M was able to obtain a letter from the laboratory stating that a lab technician made an error on the sample receipt form during the chain of custody transfer of the samples from R&M. DEC accepts this a data quality assurance clarification and as a result affirms that the GRO and VOC data in the R&M Report is not biased low and GRO and VOC compounds may be dropped from the analyte list for the pending groundwater investigation. DEC concurs with the recommendation in the R&M Report to dispose of soil stockpile at the City of Wrangell landfill. DEC requested ADOT&PF submit a work plan to investigate groundwater for impacts from residual soil contamination remaining under the septic drain field. R&M Report data show total metals in soil are at levels within the range of background for the area and are removed as contaminants of concern. If future site activity exposes subsurface piping DOT will decommission the piping and collect laboratory samples to characterize remaining soil for contaminants of concern DRO & RRO. Bruce Wanstall
7/12/2013 Update or Other Action In the approval letter for the R&M Report of site assessment in conjunction with demolition of the oil water separator and drain field, DEC requested that DOT investigate the extent of petroleum contamination in subsurface soil under the former OWS drain field. DEC prepared an ArcGIS map display of possible well locations and suggestions for drill boring & monitoring well plan for the DOT RFP. Bruce Wanstall
12/13/2013 Offsite Soil or Groundwater Disposal Approved DEC authorized DOT to transport contaminated soil from the site and the City and Borough of Wrangell accepted the 5 cubic yards of waste material from the SE corner of the DOT Wrangell S&C Blg maintenance building to Wrangell's inert waste monofill adjacent to the City rifle range. Bruce Wanstall
2/6/2014 Report or Workplan Review - Other DEC evaluated a proposed groundwater investigation work plan and sent an approval letter with comment to DOT. Bruce Wanstall
3/14/2014 Report or Workplan Review - Other DEC sent approval to DOT&PF by email regarding the final version of the workplan to advance borings, install wells and investigate groundwater for contamination. DOT&PF will collect soil samples from the borings and from the wells after completion for DRO and RRO analysis. Bruce Wanstall
6/11/2014 Site Visit DEC performed a brief inspection of the drainfield excavation and contaminated soil removal site at the maintenance facility. Monitor wells are scheduled to be installed in 2014 Bruce Wanstall
1/30/2015 Site Characterization Report Approved DEC has evaluated the Site Characterization Sampling Report by R&M Consulting and provides approval and comment by letter sent by electronic and regular mail today. The volume of soil in the vadose zone under the sewer drain field mound is not estimated and has not been directly characterized for contamination by sampling and analysis. The inaccessible subsurface soil is characterized using groundwater data. Uncertainty exists regarding petroleum fluids that may remain in the intact eastern effluent pit located under the sewer drain field mound. DEC requests ADOT&PF perform biannual groundwater characterization sampling beginning in 2015 with biennial reporting beginning in 2016. Report evaluation by DEC will determine a schedule for future long term monitoring. Analyze samples for DRO and RRO; cleanup levels are 1.5 milligrams per liter (mg/L) and 1.1 mg/L respectively, as listed in 18 AAC 75.345(b)(1) Table C. Bruce Wanstall
2/4/2015 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79406 Class V Injection Well. Contamination is present in subsurface soil at concentrations > the MTG DRO cleanup level, > the ingestion RRO cleanup level and DRO/RRO in groundwater < Table C cleanup levels. Bruce Wanstall
12/10/2015 Report or Workplan Review - Other DEC reviewed and by letter approved in accordance with 18 AAC 75.335(d) Draft Groundwater Monitoring Spring 2015 Wrangell Airport Sand and Chemical Storage Building Former Class V Injection Well by R&M Consultants, Inc. documenting groundwater sampling at the referenced Site. DRO and RRO concentrations in the groundwater samples from all three wells were below the laboratory reporting limits and the respective Method Two Table C cleanup levels. DEC requested ADOT&PF submit for approval a plan to decommission the wells. Bruce Wanstall
5/5/2016 Report or Workplan Review - Other DEC approved the ADOT&PF Decommissioning Report for three site groundwater monitoring wells in accordance with DEC guidance specifications. Bruce Wanstall
5/5/2016 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79406 Class V Injection Well. Bruce Wanstall
9/21/2016 Institutional Control Record Established Institutional Controls established and entered into the database. Bruce Wanstall
9/21/2016 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79406 Class V Injection Well. Bruce Wanstall
9/28/2016 Cleanup Complete Determination Issued DEC has determined that contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment. No further action will be required as long as the institutional controls are maintained and effective and no new information becomes available that indicates contamination poses an unacceptable risk. Bruce Wanstall
9/28/2016 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79406 Class V Injection Well. Bruce Wanstall
10/6/2016 Institutional Control Compliance Review IC compliance review conducted. Staff changed from Bruce Wanstall to IC Unit. Closure documentation uploaded to the database. Reminder system set to follow-up on the ICs Agreement page and the recorded deed notice in one month. Subsequent compliance reviews will occur every five years. Kristin Thompson
11/14/2016 Institutional Control Update Recorded deed notice received. Kristin Thompson
11/23/2016 Institutional Control Update IC reminder letter issued requesting the ICs Agreement Page be signed and returned. Kristin Thompson
11/23/2016 Institutional Control Update Spoke with an ADOT&PF representative regarding the ICs on this site. They did not sign the ICs Agreement Page, but are aware of the conditions placed on the site. ADEC will issue an IC reminder letter on a scheduled basis, every five years. Kristin Thompson

Contaminant Information

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

Control Type

Type Details
Notice of Environmental Contamination (Deed Notice)
Signed CS Determination


Description Details
Excavation / Soil Movement Restrictions A restriction to industrial land use with no excavation of the septic mound system without coordinating with DEC.
Groundwater Use Restrictions A restriction on installing groundwater wells or using groundwater from the site without prior DEC approval.
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.

Missing Location Data

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