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Site Report: ADOT&PF Aniak Building 301


Site Name: ADOT&PF Aniak Building 301
Address: End of Airport Runway, Next to FAA Building 200, Aniak, AK 99557
File Number: 2404.38.003
Hazard ID: 1578
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 61.575794
Longitude: -159.526132
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

Previous summary: DDT and petroleum contamination. Petroleum soil contamination (DRO, GRO, BTEX) from former UST. DDT contamination, all below 50 ppm, migrated from adjacent building. No action required for the DDT contamination but petroleum contamination need to be addressed. Highest contamination greatest from 4' - 10' bgs. Detections in the GW samples but below cleanup levels. Site is adjacent to FAA Building 200. During FAA's corrective action, soil samples were taken on ADOT&PF's property and DDT was discovered but the extent was not fully investigated at the time. More recent summary: Test Pit TP-15 was advanced in 1999 near former UST south of Bldg 301 had DRO at 5,510 mg/kg at 7 feet bgs but decreased with depth. De minimis contamination from UST may not be a priority issue and can likely remain in place as groundwater has not been impacted. In 1996, soil was collected for DDT analysis at near suface and subsurface. Two near surface soil samples were found to exceed under-40-inch-zone both direct contact and migration to groundwater cleanup levels (21 and 7.2 mg/kg). These results were reported in 1997 at 29.19 mg/kg and 42.8 mg/kg (a primary and duplicate sample). Older site data reported in 1995 by OHM, collected from near surface, had exceedances of most conservative criteria (4 also exceeded direct contact) at five locations (out of 8) up to an order of magnitude higher than the earlier DDT in soil investigation (if excavated may be RCRA waste). Concentrations of DDD and DDT at the adjacent FAA property found during the 1995 investigation were up to 3,722 mg/kg. Groundwater monitoring at three wells did not find groundwater impacts and the wells were decommissioned in 2004. These wells were sampled for petroleum contaminants in 1999 (although 2 at crossgradient to most of petroleum contamination). The area-wide sampling of drinking water wells in 1997 included the state troopers and old clinic buildings and the results were ND for DDT, DDD, and DDE. Detection limits were well below Table C.

Action Information

Action Date Action Description DEC Staff
8/1/1996 Site Characterization Workplan Approved Site Characterization Workplan Approved this date. Anne Marie Palmieri
7/1/1997 Site Characterization Report Approved ADEC received Sampling Results Building 301 & Runway Apron, submitted by Dowl and dated July 1997. The assessment was conducted to address DDT concentrations at Bldg 301 and possible hydrocarbon contamination at both Bldg 301 and the Runway Apron sites. Soil sampling from borings and 14 test pits indicated exceedances for DRO, GRO, BTEX and lead, with the highest contamination levels between 4' & 10'. The test pits were dug to a depth of 48 inches bgs and were 6 feet long. Soil samples contained DRO up to 29,200 mg/kg at 4 ft. bgs, GRO up to 807 mg/kg at 4 ft. bgs, benzene up to 0.13 mg/kg at 2 ft. bgs, and DDT up to 42.8 mg/kg was found in TP07 at 6 inches bgs located 15 feet off the SW corner of building 301. A water sample from the ADOT well contained GRO up to 0.247 mg/L. No exceedances were detected in the water sample for the private well immediately off-site. This petroleum contamination is associated with a former UST, which has been removed. Contamination decreases with depth, but some level of contamination has reached 25'. The GW flow appears to be away from sensitive areas (high school & nearby residential area). Anne Marie Palmieri
7/15/1997 Update or Other Action ADEC sent letter to ADOT&PF informaing them of legislative funding approval of $67,000 for addressing contamination issues at this site. ADEC requested ADOT to develop plan for site assessment or a combination site assessment/excavation plan. Donald Seagren
10/1/1997 Update or Other Action Area-wide groundwater study. Anne Marie Palmieri
4/1/1998 Update or Other Action CAP submitted, not approved nor implemented. Anne Marie Palmieri
10/6/1998 Site Characterization Workplan Approved Site Characterization Workplan Approved this date. Anne Marie Palmieri
2/5/1999 Update or Other Action ADEC reviewed Phase 1 Interim Summary Report, ADOT&PF Facilities, Aniak, dated Feb 4, 1999, submitted by S & W. The area around the former UST was investigated via the excavation of five test pits: one next to the former vent piping; one underneath the former tank; and three to assess lateral extent. The soil samples contained DRO up to 5,510 mg/kg to a depth of 10 ft. bgs. A test pit 20 ft. south west of the edge of the former UST location contained contaminated soil as well as some crushed drum debris. Based off this investigation, it was planned to advance three MWs. Grant Lidren
9/20/1999 Update or Other Action ADEC reviewed August 1999 GW Sampling At ADOT&PF Sites Aniak, dated September 20, 1999 and submitted by S & W. Three MWs located to the west and south east of the 301 building, contained DRO up to 0.890 mg/L, which is below cleanup levels. GW flow direction is approximately the same direction as was previously observed, following the Kuskokwim River. GW levels were higher in August than in April. Donald Seagren
9/30/1999 Site Characterization Report Approved During Nov. 98 & March/April 98 a Phase I & II site assesment was conducted at various Aniak Airport site. Soil contamination exceeding ADEC cleanup levels for DDT, benzene and DRO was found in the vicinity of Bldg 301. The contaminaton appears to come from various leaks and spills, the former UST and migration from the adjacent FAA Bldg 200. If excavated, the DDT contaminated soil would be considered a RCRA Hazardous Waste. Groundwater has not been impacted by petroleum hyrdocarbons at levels exceeding the cleanup standards, although concentrations of DRO, toluene and xylenes were detected in 2 of the wells below applicable cleanup levels. The GW flow direction is towards the north. Anne Marie Palmieri
8/6/2001 Update or Other Action CS Staff traveled to Aniak to conduct site visit to all ADOT&PF Aniak facility sites. David Pikul
4/14/2004 Update or Other Action ADEC reviewed March 2004 GW Monitoring at ADOT&PF Sites Aniak, dated April 14. 2004 and submitted by S&W. The three monitor wells at building 301 sampled on 15 - 17 March 04. GW flow direction not calculated due to frost-jacking or settling of the MWs. 301-MW1 was inaccessible due to ice & snow. DRO concentrations were ND or less than applicable cleanup levels in each GW sample. Donald Seagren
6/17/2004 Update or Other Action Shannon & Wilson decommissioned wells 301-MW1, 301-MW2 & 301 MW3. Additional monitor wells at the ADOT maintenance stations, former pipeline area, Aniak Runway Apron & the Aniak Middle School (former White Alice Communications Site) were also decommissioned. A drinking water well survey was also conducted to evaluate the presence of driking water wells on ADOT&PF owned land SW of the South end of the airport runway. Six drinking water wells were found in the area at the ADOT&PF Maintenance Building, Aniak City Shop, Northern Air Cargo, Hageland Air, PenAir and AST housing/office building. Donald Seagren
4/14/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Donald Seagren
9/4/2008 Update or Other Action File review conducted. Groundwater monitoring 1999 and 2004 did not detect hydrocarbons above groundwater cleanup levels and the wells were all decommissioned in 2004. Test pits excavated in 1997 found petroelum contamination in test pits west and south west of the former UST, citing the former UST as the most likely source. Previous test pits found DDT above the direct-contact cleanup level of 21 mg/kg in two locations at 29.19 mg/kg and 42.8 mg/kg. Bill O'Connell
3/23/2009 Update or Other Action Further file review to assess site status. Revising the "More Recent" site summary. Contact PM for adjacent FAA property reported to be the source of DDT/DDD. Keather McLoone
9/29/2011 Site Visit On this date, ADEC traveled to Aniak to accompany S&W during their field effort for the CIP State-owned project ADOT Aniak Area-wide, take photographs, and to network with the DOT. Grant Lidren
3/13/2012 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 72556 surface spill & UST. Grant Lidren
4/20/2012 Site Characterization Report Approved On this date, ADEC received the Final Excavation and Land Spreading Report ADOT&PF Aniak Area-Wide submitted by S&W dated April 2012. Two borings were advanced and samples were collected at 0.5 to 1.0 ft. bgs and 3.5 to 4.0 ft, bgs and analyzed for pesticides. Pesticides were not detected above cleanup levels, therefore 72 cy of soil was excavated to 4 feet bgs and land spread adjacent to the airport runway. The northern extent of excavation was limited due to proximity of building. A hydrocarbon odor was noted from the southern portion of the excavation. Additionally, PVC casing from the previously decommissioned MW-1 was discovered and removed as well as 15 feet of steel piping likely associated with the former UST. The excavation was backfilled with cleanfill. Twelve base and nine sidewall samples were screened. Six soil samples collected from the limits of the excavation contained DRO up to 9,310 mg/kg. Grant Lidren
5/25/2012 Site Visit On this date, ADEC traveled to Aniak to document and take photographs of the 2011 soil excavation fieldwork. Bill O'Connell
6/27/2012 Cleanup Complete Determination Issued The Alaska Department of Environmental Conservation (ADEC), Contaminated Sites Program, has completed a review of the environmental records associated with the ADOT&PF Aniak Building 301. Based on the information provided to date and the administrative record, the ADEC has determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment. No further remedial action will be required as long as the site is in compliance with established institutional controls. Grant Lidren
6/27/2012 Institutional Control Record Established Institutional Controls established and entered into the database. Grant Lidren
10/10/2014 Institutional Control Update Current project manager would like to retain management of this site. Evonne Reese
11/16/2015 Institutional Control Compliance Review IC compliance review conducted, staff name changed from Lidren to IC Unit, and reminder system set to review the site record in June 2017. Nathan Maxwell
6/28/2017 Institutional Control Compliance Review IC compliance review conducted. Closure/IC Details updated. ICs Verification letter issued. Reminder system set to follow-up every five years. Kristin Brown

Contaminant Information

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

Control Type

Type Details
Signed CS Determination

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site. Standard condition.
When Contaminated Soil is Accessible, Remediation Should Occur If contamination is encountered when the building is demolished, it must be addressed in accordance with applicable ADEC regulations, and/or an ADEC approved workplan.
Groundwater Use Restrictions Installation of groundwater or drinking water wells will require approval from ADEC.
Other Any future change in land use may impact the exposure assumptions cited in this document. If land use and/or ownership changes, current ICs may not be protective and ADEC may require additional remediation and/or ICs. Therefore the responsible party shall report to ADEC every five years to document land use, or report as soon as responsible party becomes aware of any change in land ownership and/or use, if earlier.
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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