Site Report: Huslia Huntington School Complex

Site Name:	Huslia Huntington School Complex
Address:	Shore Lyin Drive, Huslia, AK 99746
File Number:	820.38.002
Hazard ID:	23
Status:	Active
Staff:	* Currently Not Assigned, 9072693057 bill.oconnell@alaska.gov
Latitude:	65.701813
Longitude:	-156.388629
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.

Site Chronology
IC / Closure Details
Documents
Associated Sites

Problems/Comments

Historical leaks from bulk fuel aboveground storage tanks (ASTs) and fuel lines to barge dock (under Hazard ID XXX). Impacted soil found along 75 feet of water main to a depth of 3 feet, at a distance of 50 feet from the ASTs. Past complaints from adjacent property owners indicate possible migration of petroleum contamination. There is a drinking water well 100 feet away from the area and there is no indication of contamination at the water supply. The elevation is ~46 meters (~151 feet). The two areas of concern around the Huslia Huntington School include the abandoned tank farm on the eastern side of the High School and the four abandoned underground storage tanks (USTs) and three above ground storage tanks (ASTs) adjacent to the Elementary School, the High School, the Vocational Education Building and the teacher's housing. Approximately 1,330cy of DRO- and GRO-impacted soil were removed from the locations of three of the USTs, plus the former tank farm, in 2010. The soil was stockpiled at the City of Huslia’s Old Huslia Landfill, and subsequently spread there in 2013 after sampling showed the soil contained no contaminants above migration-to-groundwater cleanup levels. Soil contamination with concentrations above cleanup levels remains in place at the four excavation locations. The horizontal and vertical extent of contamination at the site has not been fully delineated. Groundwater contamination has not been investigated. This Hazard ID also includes PPRP spill no. 17309917404. On 6/23/17 petroleum contamination was encountered during construction activities in a known contaminated area. An additional area of contaminated soils was found where an AST and UST were removed from west side of the High School. Analytical samples were collected from test pits in this area. Results showed levels of diesel range organics (DRO), benzene, ethylbenzene, and xylenes above migration to groundwater levels. By 2018, a new school addition was constructed above this area of contamination. Additionally, the UST located to the southeast of the elementary school was removed and 450 cubic yards of contaminated soil were excavated and placed into a landfarm based on an agreement between the school and the City of Huslia. Removal of all impacted soil was not feasible and DEC worked with the school to identify vapor intrusion controls for the buildings under construction.

Action Information

Action Date	Action	Description	DEC Staff
8/7/1996	Update or Other Action	A private resident notified inspector conducting facility inspections that the day tank owned by the Huntington School has an ongoing leak. The resident (who owns the property across the street) said each spring during breakup his property is polluted with diesel fuel from the runoff of the tank spill. Added to the database in 2007 to reflect administrative file.	Shannon Oelkers
7/13/2000	Potentially Responsible Party/State Interest Letter	Potentially Responsible Party / State Interested Letter issued to Yukon Koyukuk School District.	Larry Johnson
10/27/2000	Update or Other Action	Oasis Environmental submitted report "Huslia Bulk Fuel Site Assessment Site Reconnaissance Report." The report identifies six vertical and one horizontal tank used to store fuel oil for the high school and elementary school. Total capacity of the tank farm is approximately 40,000 gallons. These tanks are within an unlined area contained by a 3-foot berm. Underground piping connects the tank farm to five day tanks (underground storage tanks) used to heat the school buildings and teacher housing. The tanks are filled by a tanker truck which is refueled by the barge in the summer. Added to the database in 2007 to reflect administrative file.	Shannon Oelkers
2/7/2002	Site Added to Database	Petroleum contamination from leaking ASTs and piping.	Bruce Wanstall
2/7/2002	Site Ranked Using the AHRM	Preliminary ranking. Located in Huslia, which is in the Koyukuk National Wildlife Refuge.	Bruce Wanstall
2/24/2004	Update or Other Action	Site being considered for CIP funding. Though AHRM rates "medium", site has enough information to possibly warrant urgent attention. File review and RFP being performed.	Mike Jaynes
5/5/2006	Update or Other Action	File number updated to 820.38.002.	Aggie Blandford
7/12/2006	Update or Other Action	AVEC reports that YKSD has completed tank farm upgrade and is switched over to new piping and new day tank (500 gallon ASTs) that is within a lined containment berm. All old bulk fuel storage tanks are abandoned.	Shannon Oelkers
11/29/2006	Update or Other Action	Staff transferred from Pikul to Jaynes.	Aggie Blandford
1/26/2007	Update or Other Action	Staff transferred from Jaynes to Oelkers.	Shannon Oelkers
2/2/2007	Meeting or Teleconference Held	ADEC staff Oelkers & DeRuyter met with Chris Simon (YKSD Superintendent) and John Christian (YKSD Director of Facilities) to discuss thier concerns about the Huslia Huntington School. They identified six abandoned vertical ASTs, as well as five abandoned UST's and buried piping on site. The USTs are buried in silty/sandy loam soil and were gravity feed delivery systems. The USTs were installed between 1970 and 1985. School buildings are wooden foundations placed directly on the ground or on piers. Buildings on piers are skirted. The tight crawlspace, high liklihood of potential contamination and no remedial action has caused concern over indoor air at the school. The schools drinking water source is about 1/2 mile away, and is generally uphill from the school site. Depth to GW is 25-30 feet. The school is mile from the Koyukuk river.	Shannon Oelkers
2/9/2007	Exposure Tracking Model Ranking	ETM baseline ranking complete for this site.	Shannon Oelkers
6/25/2007	Update or Other Action	ADEC Staff Oelkers conducted site visit during site characterization work performed by Oasis. Four test pits around the perimeter of the former AST tank farm showed extensive diesel fuel contamination north and west of the AST pad. The liner was breached in several places, and one tank had been spray painted "Do Not Use, Leaking" Strong hydrocarbon odor evident from the surface to 15 feet bgs (limits of excavation). Depth to groundwater is 25 feet. Soil in Huslia is sand with fines. Interviewed the mayor of Huslia, a city councilman, and on-site ANTHC staff working on the new water/sewage system. Also interviewed local residents and children to determine site use and access by children to the affected area. Currently children frequently play in the area, and many children use the area as a shortcut between the playground and their homes.	Shannon Oelkers
6/29/2007	Update or Other Action	Access to the former AST tank farm area will be restricted to maintenance and school personnel. Fencing will be extended to completely block access and signage will be posted to alert residents to the hazards. Fencing and signs will be in place by the start of the 2007 school year.	Shannon Oelkers
7/27/2007	Update or Other Action	Site transferred from Oelkers to Farris.	Shannon Oelkers
8/27/2007	Update or Other Action	Staff spoke with Oasis Environmental. The final report is expected to be completed by mid-september. Staff sent letters to the City of Huslia and the Traditional Council, informing them of the timeline for the report and requesting that they help inform the community about the importance of the fencing around the ASTs.	Ann Farris
8/29/2007	Update or Other Action	Staff spoke with Speedy Sam at the Huslia Traditional Council today. He is concerned with the status of the school and explained that last winter the children complained of headaches. He hoped cleanup work would be completed this summer. I indicated we were awaiting the report from Oasis to make decisions on cleanup at the site and I was unclear if the State would pay for any further work at the site. I indicated I would contact him as soon as I received the report or had any further information.	Ann Farris
9/6/2007	Update or Other Action	Staff met with Chris Simon and John Christian from the YK school district to discuss the preliminary results from the June 2007 investigation and the concerns of the Traditional Council. Preliminary results do not indicate significant vapor intrusion into the elementary school or the teacher's building. Also surface samples collected near the high school are not elevated. these data, however, are not conclusive that vapor intrusion is not occurring. A complete vapor intrusion assessment at the high school, which is located closest to the tanks, could not be completed in June. The YKSD has submitted a request for CIP funds from the state legislator to remove the old tank system and remediate the soils. I indicated the ADEC will try to find money to do additional vapor intrusion assessment at the high school.	Ann Farris
9/20/2007	Exposure Tracking Model Ranking	Staff reviewed and commented on the draft site characterization report for the Huslia Huntington ASTs. The site has significant diesel contamination in the soil adjacent to the two school buildings and the teacher’s housing. The ETM ranking has been updated. The vapor intrusion pathway must be further investigated as well as the potential for migration to a drinking water source. The Yukon Koyukuk School District is looking into funding sources to remove the contaminated soil. ADEC is looking into funding for additional vapor intrusion assessment.	Ann Farris
10/25/2007	Update or Other Action	Site transferred from Farris to Carnahan.	John Carnahan
11/16/2007	Meeting or Teleconference Held	Teleconference with YKSD, Huslia Tribal Government, and City Manager to discuss the results of the limited site characterization and air sampling, and to go over the proposed additional air sampling scheduled for December. A workplan will be completed and provided for review by all parties. Coordination with the school will continue.	John Carnahan
5/8/2008	Update or Other Action	ADEC received the Vapor Intrusion Assessment for the Huslia Huntington School. Oasis conducted a vapor intrusion assessment at the school from January 9 to 11, 2008. The assessment included the collection of crawl space and indoor air samples at the elementary school, high school, vocational education building, and one of the housing buildings. In addition, a single outdoor air sample was collected near the abandoned tank farm at the high school. The analytical results of the air samples from the elementary school, vocational education building, and the housing unit indicate that other sources of petroleum vapor are affecting indoor air quality. The analytical results for the high school had slightly lower average concentrations of BTEX compounds for indoor air samples than for crawl space air samples. However, the presence of numerous petroleum-based products in the high school confounds the issue of whether vapor intrusion is actually occurring, or whether indoor air concentrations are merely a result of background sources. Concentrations of BTEX in the outdoor air sample were approximately equal to the average concentrations in crawl space air samples. Benzene was detected above EPA TIAC in every indoor air sample collected at the site.	Deborah Williams
7/16/2009	Brownfields Award	FY 2009 SOA CIP funds $28,327 awarded to Yukon Koyukuk School District for Assessment and cleanup of Huslia School Tank farm and tanks. Contract # 18-9028-13. Current status: Corrective Action Plan completed 3/2010, tank removal and report done 2010/2011.	Cascade Galasso-Irish
8/13/2009	Update or Other Action	DEC received a response from the Alaska State Historic Preservation Office (SHPO) for the cleanup work planned for FY2010/2011 that there is "No Historic Properties Affected."	Deborah Williams
3/3/2010	Update or Other Action	DEC received a Preliminary Corrective Action Plan for the Huslia Huntington School. DEC hired OASIS to complete the plan for work scheduled for summer 2010. According to the plan, OASIS estimates the total volume of impacted soil within the AST and UST areas to be approximately 4,000 to 4,300 cubic yards assuming the top 15 feet. Several remedial options were addressed in the plan but the top option that was recommended was the excavation of the top 4 feet of soil and using it as cover at the landfill.	Deborah Williams
6/11/2010	Update or Other Action	Devan Currier with ANTHC called about their water main installation project in Huslia. They have run into petroleum contamination associated with a pipeline that appears to be the old fuel line that ran from the barge landing to the school tank farms. ANTHC plans to take any soil that they must excavate to the city biocell. Sent information on DEC's trenching policy to ANTHC.	Janice Wiegers
8/9/2010	Site Visit	Oasis, consultant for DEC, went out the to Huslia from 8/9 - 21/2010 to conduct the cleanup work at the school. The work included removing 3 USTs; abandoning one UST in place; excavation of approximately 2,000 cubic yards of contaminated soil from the USTs and the former AST tank farm location.	Deborah Williams
8/23/2010	Update or Other Action	DEC received the Contaminated Soil Sampling Report from the AST spill excavation that is located adjacent to the High School. During a construction project for the Huslia High School that included the installation of a french drain along the footings of the building and application of waterproof membrane around the stem wall, a 500-gallon AST and a 500-gallon UST were removed. Contaminated soil was encountered during the contruction work. Approximately 25 cubic yards of contaminated soil was excavated in association with releases from the two tanks. The excavation was approximately six feet deep and fifteen feet wide. Many soils were screened using a PID and 14 soil samples were collected and analyzed for DRO and BTEX. All the soil samples were below DEC Health Based cleanup levels except for one sample that was collected from the excavation that had a DRO level at 18,700 ppm and Xylenes at 128 ppm.	Deborah Williams
2/25/2011	Document, Report, or Work plan Review - other	DEC received the UST Removal and Soil Cleanup Report for the Huslia Huntington School project dated February 14, 2011. During the summer of 2010, Oasis Environmental performed an underground storage tank removal and soil cleanup at the Jimmy Huntington School in Huslia, Alaska, on behalf of DEC. The project involved removing three USTs; two associated with the Vocational Education Building and one associated with Teacher's Housing. A fourth UST associated with the Elementary School that was slated to be removed, was left in place because intersecting underground utilities had been installed above the tank. Enough soil was excavated to remove the tanks and an additional 2 feet of contaminated soil below the tanks. The contaminated soil was transported to an unlined bermed stockpile at the old landfill. Confirmation samples collected from each UST excavation indicate that there was residual soil with concentrations up to 14,700 ppm (DRO) and 2,030 ppm (GRO). BTEX and PAHs were below the most stringent DEC cleanup levels. The aboveground storage tank (AST) farm located east of the high school building was also removed in summer of 2010. The AST removal was performed by another contractor. Oasis removed the associated piping (and residual fuel) and wooden tank support platforms. Oasis also removed contaminated soil associated with the former tank farm to a depth of 5 feet below ground surface and over an area of approximately 4,200 square feet. Approximately 950 cubic yards of contaminated soil was removed and transported to the containment area at the old landfill. The excavation was backfilled and regraded. Confirmation soil samples were collected from the excavation: 10 from the floor of the excavation and 10 from the sidewalls. The highest concentration was 6,210 ppm DRO from a sidewall sample and 669 ppm GRO from a excavation floor sample. All the BTEX and PAH samples were below DEC most stringent cleanup levels. An additional 280 CY of contaminated soil generated during the foundation work at the high school was also transported to the old landfill and placed in a separate stockpile unlined containment area. Both stockpiles were sampled using a multi-increment sampling technique. The smaller stockpile (280 CY) contains average concentrations of 703 ppm DRO and 460 ppm GRO. The 95% UCL was 1,821 ppm DRO and 1,032 ppm GRO. The larger 950 CY stockpile contains average concentrations of 700 ppm DRO and 320 ppm GRO with a 95% UCL of 750 ppm DRO and 353 ppm GRO.	Deborah Williams
3/6/2012	Brownfields Award	FY 2012 SOA funds $31,601 awarded to Yukon Koyukuk School District for Stockpile sampling and environmental site evaluation of Huslia Huntington School. NTP# 18-4002-11-040 approved on this date. Current status: stockpile management and VI investigation word added and extended into 2013, project underway.	Cascade Galasso-Irish
3/22/2012	Exposure Tracking Model Ranking	A new updated ranking with ETM has been completed for source area 78120 Former school ASTs & USTs.	Melinda Brunner
7/5/2012	Document, Report, or Work plan Review - other	OASIS Environmental submitted a draft work plan entitled, "Huslia Huntington School Stockpile Sampling Plan" dated June 20, 2012. The document describes the proposed multi-increment sampling of four stockpiles at the Old Huslia Landfill in 2012. Two of the stockpiles (approximately 1,040 cubic yards and 280 cubic yards, respectively) were generated during the 2010 contaminated soil removal action at the Huslia Huntington School, and contained diesel-range and gasoline-range organics above DEC cleanup levels at that time. The other two stockpiles (approximately 3,000 cubic yards and 230 cubic yards, respectively) to be tested are of unknown origin. The purpose of this sampling is to characterize the piles and/or determine if contaminant levels have decreased below DEC cleanup levels. Brunner reviewed the draft work plan and return comments to OASIS Environmental on July 5, 2012.	Melinda Brunner
7/6/2012	Site Characterization Workplan Approved	Brunner approved OASIS Environmental's work plan entitled, "Huslia Huntington School Stockpile Sampling Plan" dated July 6, 2012. Field work is tentatively scheduled for July 9-12, 2012.	Melinda Brunner
12/20/2012	Document, Report, or Work plan Review - other	OASIS submitted a report entitled "Stockpile Sampling Report, Jimmy Huntington School, Huslia, AK, DRAFT" dated December 6, 2012 on December 6, 2012. The report describes stockpile sampling done at the old Huslia Landfill in July 2012. Brunner returned comments on the draft report to OASIS on December 20, 2012.	Melinda Brunner
3/13/2013	Site Characterization Report Approved	OASIS submitted a final report entitled "Stockpile Sampling Report, Jimmy Huntington School, Huslia, AK," dated March 8, 2013 on March 8, 2013. Brunner approved the document on March 13, 2013. The document describes the results of stockpile sampling done in 2012. No contaminants of concern (i.e. DRO, GRO, BTEX, PAHs) sampled for in the stockpiles were were found in concentrations above DEC cleanup levels.	Melinda Brunner
8/26/2013	Update or Other Action	Copy of report entitled "Stockpile Sampling Report, Jimmy Huntington School, Huslia, AK," dated March 8, 2013 sent to Elsie Vent (Administrator for the City of Huslia).	Melinda Brunner
9/16/2013	Brownfields Award	FY 2014 SOA Capital Improvement Project funds $73,928 awarded for monitoring and potential site closure through stockpile disposal. NTP# 18803602008B. Current status: project initiated, vapor intrusion investigation was also completed.	Cascade Galasso-Irish
10/16/2013	Update or Other Action	ERM Alaska, Inc. submitted a stockpile management plan detailing how three stockpiles that were confirmed free of petroleum-related contaminants above cleanup levels in 2012 will be spread at the Old Huslia Landfill. The three piles are known as Stockpiles 1 and 2 (approximately 1,040 cubic yards and 280 cubic yards, respectively, generated during the 2010 contaminated soil removal action at the Huslia Huntington School), and Stockpile 4 (approximately 230 cubic yards, of unknown origin). Brunner approved the described spreading activities on 10/16/13. ERM intends to spread the stockplies in Fall 2013, and return to seed and fertilze the spread soil in Spring 2014.	Melinda Brunner
10/20/2013	Update or Other Action	ERM Alaska, Inc. completed the spreading of three stockpiles that were confirmed free of petroleum-related contaminants above cleanup levels in 2012 at the Old Huslia Landfill. The three piles are known as Stockpiles 1 and 2 (approximately 1,040 cubic yards and 280 cubic yards, respectively, generated during the 2010 contaminated soil removal action at the Huslia Huntington School), and Stockpile 4 (approximately 230 cubic yards, of unknown origin).	Melinda Brunner
1/9/2014	Document, Report, or Work plan Review - other	ERM, Alaska, Inc. submitted a work plan on 01/07/2014 describing a vapor intrusion investigation scheduled to take place at the Huslia Huntington School in January 2014. Brunner reviewed the document and returned comments to ERM on 01/09/2014.	Melinda Brunner
1/10/2014	Site Characterization Workplan Approved	Finalized workplan by ERM, Alaska, Inc. describing a vapor intrusion investigation scheduled to take place at the Huslia Huntington School in January 2014 approved by Brunner.	Melinda Brunner
1/29/2014	Update or Other Action	Vapor intrusion sampling underway at the Huslia Huntington School.	Melinda Brunner
10/13/2014	Document, Report, or Work plan Review - other	Brunner reviewed ERM’s report entitled, “Air Quality Sampling and Stockpile Management, Huslia Huntington School and Landfarm, DRAFT” dated July 2014 and returned comments to ERM for resolution.	Melinda Brunner
1/5/2015	Site Characterization Report Approved	Brunner approved ERM’s report entitled, “Air Quality Sampling and Stockpile Management, Huslia Huntington School and Landfarm, Final” dated December 2014 on 01/5/15. The document describes the results of outdoor, indoor, and crawlspace air sampling at four Huslia Huntington School buildings (elementary school, high school, vocational education building, and teacher's housing) in January 2014. The analytical results indicate that all the indoor air and crawlspace air samples exceed the DEC Residential Indoor Air Target Levels (RIATLs) for benzene and ethylbenzene. A subset of the samples, including all indoor air samples in the High School,exceeded the RIATL for xylenes. Naphthalene results also exceeded RIATLs in all but one of the samples from the High School and in the indoor air samples from the other three buildings. 1-methylnaphthalene exceeded RIATLs in one crawlspace sample from the High School. Crawlspace and indoor air sample results were compared to determine whether contaminant concentrations attenuate between the crawlspace and the living space. The indoor air results were either comparable to the crawlspace results (Elementary School) or were higher than the crawlspace results (High School, VocEd building). Outdoor air results were compared to indoor air results, and found comparable in the High School and Elementary School. The outdoor air sample results from the Teacher’s House were much higher than the indoor air and crawlspace air results. It is likely that outdoor air contaminant sources are affecting the indoor air samples, especially in buildings that are accessed frequently by students and faculty.	Melinda Brunner
3/23/2015	Meeting or Teleconference Held	Teleconference held with representatives of Yukon-Koyukuk School District (K. Boyd and G. Bourne) and Division of Public Health (A. Hamade and S. Deglin)to discuss 2014 air sampling results for the school. While measured contaminant concentrations were above DEC's Indoor Air Target Levels, Public Health's assessment is that the risk to students and staff is low to very low based on conservative exposure estimates. Since contaminant concentrations in indoor and outdoor air were typically equal to or higher than concentrations in crawlspace air, recommendations to improve the air quality at the school are focused on proper storage of chemicals (e.g. cleaning supplies, paints), proper ventilation, and reducing vehicular traffic around air intakes.	Melinda Brunner
6/29/2017	Update or Other Action	Request for more information sent to Yukon-Koyukuk School District with a deadline of July 28, 2017.	Laura Jacobs
7/12/2017	Meeting or Teleconference Held	DEC notified that YKSD is constructing a new wing to the high school that will house the elementary school in the future. The existing elementary school building will be demolished. Soil cleanup will be included in plans.	Janice Wiegers
5/22/2018	Update or Other Action	ADEC provided guidance to YKSD regarding the need for work plans prepared by a Qualified Environmental Professional for construction activities in a contaminated site.	Laura Jacobs
9/10/2018	Update or Other Action	ADEC CS staff uncovered evidence from a construction report (July 2017) that the AST previously located next to the High School apparently was a source for contamination, with exceedances at 5 ft below ground surface for diesel range organics, benzene, xylenes and ethylbenzene.	Laura Jacobs
9/10/2018	Spill Transferred from Prevention Preparedness and Response Program	Spill transferred by PPRP staff Mike Garrett. Spill no. 17309917404; spill date = 6/23/17; substance = diesel; quantity = unknown; PPRP file no. 820.02.001; description: petroleum contamination was encountered during construction activities in a known contaminated area. Approximate coordinates: 65.701813, -156.38957; datum = WGS84; collection date = 9/10/18; source = CS ArcGIS.com web map.	Mitzi Read
10/8/2018	Meeting or Teleconference Held	ADEC CS and PPR staff met with Shannon & Wilson staff, and staff from the YKSD regarding additional fuel contaminated soils found underneath a UST that had been capped and left in place (see 2011 report from OASIS). Strategies were discussed for additional soil removal, sample collection to confirm and document remaining contaminated soils.	Laura Jacobs
10/9/2018	Leaking Underground Storage Tank Cleanup Initiated - Petroleum	ADEC staff received a Spill Notification form from the Yukon Koyukuk School District for discovery of additional petroleum contamination under a UST left near the Elementary School.	Laura Jacobs
12/3/2018	Document, Report, or Work plan Review - other	ADEC staff received a copy of the Huslia Soil Assessment 2018 Summary Report, Shannon & Wilson.	Laura Jacobs
1/23/2019	Document, Report, or Work plan Review - other	ADEC staff reviewed the "2018 Summary Report, Huslia Soil Assessment" submitted by Shannon & Wilson, December 3, 2018. Comments concern required additional borings to characterize the horizontal and vertical extent of contamination left on school grounds.	Laura Jacobs
6/27/2019	Update or Other Action	Site location was updated on this date. Coordinates for this site are used to determine the presence and position of the site on BLM’s ANCSA Conveyed Land web map.	Rebekah Reams
8/8/2019	Exposure Tracking Model Ranking	A new updated ranking with ETM has been completed for source area 78120 Former school ASTs & USTs.	Laura Jacobs
8/9/2019	Meeting or Teleconference Held	ADEC staff met with the Yukon Koyukuk School District Capitol Projects Manager to discuss funding sources, last year's construction activities, and current understanding of risk to contaminated sites. Both the state and the school district plan to pursue additional funding, and work with consultant to develop a work plan for site characterization.	Laura Jacobs
8/15/2019	Exposure Tracking Model Ranking	A new updated ranking with ETM has been completed for source area 78120 Former school ASTs & USTs.	Laura Jacobs
9/17/2019	Document, Report, or Work plan Review - other	ADEC staff reviewed the document "Vapor Intrusion Assessment, Land Farm Monitoring, and Site Characterization Phased Work Plan" for proposed efforts at this site. Comments were issued for this draft work plan. Five soil-gas samples will be collected from the crawlspace within the combined elementary and high school building. Indoor air samples will be collected from four locations within the building. Land farmed soils will be sampled to determine whether they are ready to be spread outside of the land farm. Shannon & Wilson hopes to complete the work by the end of September or October.	Laura Jacobs
9/25/2019	Document, Report, or Work plan Review - other	ADEC staff approved the final version of the 2019 work plan to include soil gas, crawlspace and indoor air samples collected in the school complex. Also, Yukon-Koyukuk School District approved sampling the landfarmed contaminated soils from the 2018 excavation to determine whether they were ready to be used for cover. Other aspects of site characterization that need to occur do not currently have funding and will be on hold until funding is found.	Laura Jacobs
1/31/2020	Document, Report, or Work plan Review - other	ADEC staff reviewed the revised version of the Vapor Intrusion Assessment and Landfarm Monitoring report. Deviations from work plan were required for landfarm sampling; the results indicate remaining Diesel Range Organics above the clean up level. Vapor intrusion mitigation efforts resulted in contaminants of concern inside the school but not found in the crawlspace samples. This indicates a source of hydrocarbons within the school building, and not resulting from vapors entering the building from the soil or groundwater.	Laura Jacobs
2/20/2020	Document, Report, or Work plan Review - other	ADEC staff reviewed the revised Final Summary Report, Vapor Intrusion Assessment and Landfarm Monitoring, received February 19, 2020. Indoor, outdoor and sub-soil gas samples were collected in and around the Huslia Huntington School Complex. Naphthalene was detected in exceedance of indoor air residential target levels in the school commons and gym. Several other contaminants of potential concern were detected in indoor air below target levels. Naphthalene was not detected in sub-soil gas samples in the crawlspace which rules out vapor intrusion from petroleum-contaminated soil beneath the school. Landfarmed soils were sampled but because the soil was too soggy, additional sampling will be required prior to moving soils out of the landfarm for use.	Laura Jacobs
8/23/2021	Document, Report, or Work plan Review - other	ADEC received a proposed work plan from the QEP to fly to Huslia and sample the landfarm. Samples will be collected and field screened for the highest value. Those samples will be collected for analysis of diesel range organics, gasoline range organics, residual range organics, benzene, toluene, ethylbenzene, and xylenes, and one sample for polynuclear aromatic hydrocarbons. A brief sample report will be sent when results are received from the laboratory.	Laura Jacobs

Action Date

Action

Description

DEC Staff

8/7/1996

Update or Other Action

A private resident notified inspector conducting facility inspections that the day tank owned by the Huntington School has an ongoing leak. The resident (who owns the property across the street) said each spring during breakup his property is polluted with diesel fuel from the runoff of the tank spill. Added to the database in 2007 to reflect administrative file.

Shannon Oelkers

7/13/2000

Potentially Responsible Party/State Interest Letter

Potentially Responsible Party / State Interested Letter issued to Yukon Koyukuk School District.

Larry Johnson

10/27/2000

Update or Other Action

Oasis Environmental submitted report "Huslia Bulk Fuel Site Assessment Site Reconnaissance Report." The report identifies six vertical and one horizontal tank used to store fuel oil for the high school and elementary school. Total capacity of the tank farm is approximately 40,000 gallons. These tanks are within an unlined area contained by a 3-foot berm. Underground piping connects the tank farm to five day tanks (underground storage tanks) used to heat the school buildings and teacher housing. The tanks are filled by a tanker truck which is refueled by the barge in the summer. Added to the database in 2007 to reflect administrative file.

Shannon Oelkers

2/7/2002

Site Added to Database

Petroleum contamination from leaking ASTs and piping.

Bruce Wanstall

2/7/2002

Site Ranked Using the AHRM

Preliminary ranking. Located in Huslia, which is in the Koyukuk National Wildlife Refuge.

Bruce Wanstall

2/24/2004

Update or Other Action

Site being considered for CIP funding. Though AHRM rates "medium", site has enough information to possibly warrant urgent attention. File review and RFP being performed.

Mike Jaynes

5/5/2006

Update or Other Action

File number updated to 820.38.002.

Aggie Blandford

7/12/2006

Update or Other Action

AVEC reports that YKSD has completed tank farm upgrade and is switched over to new piping and new day tank (500 gallon ASTs) that is within a lined containment berm. All old bulk fuel storage tanks are abandoned.

Shannon Oelkers

11/29/2006

Update or Other Action

Staff transferred from Pikul to Jaynes.

Aggie Blandford

1/26/2007

Update or Other Action

Staff transferred from Jaynes to Oelkers.

Shannon Oelkers

2/2/2007

Meeting or Teleconference Held

ADEC staff Oelkers & DeRuyter met with Chris Simon (YKSD Superintendent) and John Christian (YKSD Director of Facilities) to discuss thier concerns about the Huslia Huntington School. They identified six abandoned vertical ASTs, as well as five abandoned UST's and buried piping on site. The USTs are buried in silty/sandy loam soil and were gravity feed delivery systems. The USTs were installed between 1970 and 1985. School buildings are wooden foundations placed directly on the ground or on piers. Buildings on piers are skirted. The tight crawlspace, high liklihood of potential contamination and no remedial action has caused concern over indoor air at the school. The schools drinking water source is about 1/2 mile away, and is generally uphill from the school site. Depth to GW is 25-30 feet. The school is mile from the Koyukuk river.

Shannon Oelkers

2/9/2007

Exposure Tracking Model Ranking

ETM baseline ranking complete for this site.

Shannon Oelkers

6/25/2007

Update or Other Action

ADEC Staff Oelkers conducted site visit during site characterization work performed by Oasis. Four test pits around the perimeter of the former AST tank farm showed extensive diesel fuel contamination north and west of the AST pad. The liner was breached in several places, and one tank had been spray painted "Do Not Use, Leaking" Strong hydrocarbon odor evident from the surface to 15 feet bgs (limits of excavation). Depth to groundwater is 25 feet. Soil in Huslia is sand with fines. Interviewed the mayor of Huslia, a city councilman, and on-site ANTHC staff working on the new water/sewage system. Also interviewed local residents and children to determine site use and access by children to the affected area. Currently children frequently play in the area, and many children use the area as a shortcut between the playground and their homes.

Shannon Oelkers

6/29/2007

Update or Other Action

Access to the former AST tank farm area will be restricted to maintenance and school personnel. Fencing will be extended to completely block access and signage will be posted to alert residents to the hazards. Fencing and signs will be in place by the start of the 2007 school year.

Shannon Oelkers

7/27/2007

Update or Other Action

Site transferred from Oelkers to Farris.

Shannon Oelkers

8/27/2007

Update or Other Action

Staff spoke with Oasis Environmental. The final report is expected to be completed by mid-september. Staff sent letters to the City of Huslia and the Traditional Council, informing them of the timeline for the report and requesting that they help inform the community about the importance of the fencing around the ASTs.

Ann Farris

8/29/2007

Update or Other Action

Staff spoke with Speedy Sam at the Huslia Traditional Council today. He is concerned with the status of the school and explained that last winter the children complained of headaches. He hoped cleanup work would be completed this summer. I indicated we were awaiting the report from Oasis to make decisions on cleanup at the site and I was unclear if the State would pay for any further work at the site. I indicated I would contact him as soon as I received the report or had any further information.

Ann Farris

9/6/2007

Update or Other Action

Staff met with Chris Simon and John Christian from the YK school district to discuss the preliminary results from the June 2007 investigation and the concerns of the Traditional Council. Preliminary results do not indicate significant vapor intrusion into the elementary school or the teacher's building. Also surface samples collected near the high school are not elevated. these data, however, are not conclusive that vapor intrusion is not occurring. A complete vapor intrusion assessment at the high school, which is located closest to the tanks, could not be completed in June. The YKSD has submitted a request for CIP funds from the state legislator to remove the old tank system and remediate the soils. I indicated the ADEC will try to find money to do additional vapor intrusion assessment at the high school.

Ann Farris

9/20/2007

Exposure Tracking Model Ranking

Staff reviewed and commented on the draft site characterization report for the Huslia Huntington ASTs. The site has significant diesel contamination in the soil adjacent to the two school buildings and the teacher’s housing. The ETM ranking has been updated. The vapor intrusion pathway must be further investigated as well as the potential for migration to a drinking water source. The Yukon Koyukuk School District is looking into funding sources to remove the contaminated soil. ADEC is looking into funding for additional vapor intrusion assessment.

Ann Farris

10/25/2007

Update or Other Action

Site transferred from Farris to Carnahan.

John Carnahan

11/16/2007

Meeting or Teleconference Held

Teleconference with YKSD, Huslia Tribal Government, and City Manager to discuss the results of the limited site characterization and air sampling, and to go over the proposed additional air sampling scheduled for December. A workplan will be completed and provided for review by all parties. Coordination with the school will continue.

John Carnahan

5/8/2008

Update or Other Action

ADEC received the Vapor Intrusion Assessment for the Huslia Huntington School. Oasis conducted a vapor intrusion assessment at the school from January 9 to 11, 2008. The assessment included the collection of crawl space and indoor air samples at the elementary school, high school, vocational education building, and one of the housing buildings. In addition, a single outdoor air sample was collected near the abandoned tank farm at the high school. The analytical results of the air samples from the elementary school, vocational education building, and the housing unit indicate that other sources of petroleum vapor are affecting indoor air quality. The analytical results for the high school had slightly lower average concentrations of BTEX compounds for indoor air samples than for crawl space air samples. However, the presence of numerous petroleum-based products in the high school confounds the issue of whether vapor intrusion is actually occurring, or whether indoor air concentrations are merely a result of background sources. Concentrations of BTEX in the outdoor air sample were approximately equal to the average concentrations in crawl space air samples. Benzene was detected above EPA TIAC in every indoor air sample collected at the site.

Deborah Williams

7/16/2009

Brownfields Award

FY 2009 SOA CIP funds $28,327 awarded to Yukon Koyukuk School District for Assessment and cleanup of Huslia School Tank farm and tanks. Contract # 18-9028-13. Current status: Corrective Action Plan completed 3/2010, tank removal and report done 2010/2011.

Cascade Galasso-Irish

8/13/2009

Update or Other Action

DEC received a response from the Alaska State Historic Preservation Office (SHPO) for the cleanup work planned for FY2010/2011 that there is "No Historic Properties Affected."

Deborah Williams

3/3/2010

Update or Other Action

DEC received a Preliminary Corrective Action Plan for the Huslia Huntington School. DEC hired OASIS to complete the plan for work scheduled for summer 2010. According to the plan, OASIS estimates the total volume of impacted soil within the AST and UST areas to be approximately 4,000 to 4,300 cubic yards assuming the top 15 feet. Several remedial options were addressed in the plan but the top option that was recommended was the excavation of the top 4 feet of soil and using it as cover at the landfill.

Deborah Williams

6/11/2010

Update or Other Action

Devan Currier with ANTHC called about their water main installation project in Huslia. They have run into petroleum contamination associated with a pipeline that appears to be the old fuel line that ran from the barge landing to the school tank farms. ANTHC plans to take any soil that they must excavate to the city biocell. Sent information on DEC's trenching policy to ANTHC.

Janice Wiegers

8/9/2010

Site Visit

Oasis, consultant for DEC, went out the to Huslia from 8/9 - 21/2010 to conduct the cleanup work at the school. The work included removing 3 USTs; abandoning one UST in place; excavation of approximately 2,000 cubic yards of contaminated soil from the USTs and the former AST tank farm location.

Deborah Williams

8/23/2010

Update or Other Action

DEC received the Contaminated Soil Sampling Report from the AST spill excavation that is located adjacent to the High School. During a construction project for the Huslia High School that included the installation of a french drain along the footings of the building and application of waterproof membrane around the stem wall, a 500-gallon AST and a 500-gallon UST were removed. Contaminated soil was encountered during the contruction work. Approximately 25 cubic yards of contaminated soil was excavated in association with releases from the two tanks. The excavation was approximately six feet deep and fifteen feet wide. Many soils were screened using a PID and 14 soil samples were collected and analyzed for DRO and BTEX. All the soil samples were below DEC Health Based cleanup levels except for one sample that was collected from the excavation that had a DRO level at 18,700 ppm and Xylenes at 128 ppm.

Deborah Williams

2/25/2011

Document, Report, or Work plan Review - other

DEC received the UST Removal and Soil Cleanup Report for the Huslia Huntington School project dated February 14, 2011. During the summer of 2010, Oasis Environmental performed an underground storage tank removal and soil cleanup at the Jimmy Huntington School in Huslia, Alaska, on behalf of DEC. The project involved removing three USTs; two associated with the Vocational Education Building and one associated with Teacher's Housing. A fourth UST associated with the Elementary School that was slated to be removed, was left in place because intersecting underground utilities had been installed above the tank. Enough soil was excavated to remove the tanks and an additional 2 feet of contaminated soil below the tanks. The contaminated soil was transported to an unlined bermed stockpile at the old landfill. Confirmation samples collected from each UST excavation indicate that there was residual soil with concentrations up to 14,700 ppm (DRO) and 2,030 ppm (GRO). BTEX and PAHs were below the most stringent DEC cleanup levels. The aboveground storage tank (AST) farm located east of the high school building was also removed in summer of 2010. The AST removal was performed by another contractor. Oasis removed the associated piping (and residual fuel) and wooden tank support platforms. Oasis also removed contaminated soil associated with the former tank farm to a depth of 5 feet below ground surface and over an area of approximately 4,200 square feet. Approximately 950 cubic yards of contaminated soil was removed and transported to the containment area at the old landfill. The excavation was backfilled and regraded. Confirmation soil samples were collected from the excavation: 10 from the floor of the excavation and 10 from the sidewalls. The highest concentration was 6,210 ppm DRO from a sidewall sample and 669 ppm GRO from a excavation floor sample. All the BTEX and PAH samples were below DEC most stringent cleanup levels. An additional 280 CY of contaminated soil generated during the foundation work at the high school was also transported to the old landfill and placed in a separate stockpile unlined containment area. Both stockpiles were sampled using a multi-increment sampling technique. The smaller stockpile (280 CY) contains average concentrations of 703 ppm DRO and 460 ppm GRO. The 95% UCL was 1,821 ppm DRO and 1,032 ppm GRO. The larger 950 CY stockpile contains average concentrations of 700 ppm DRO and 320 ppm GRO with a 95% UCL of 750 ppm DRO and 353 ppm GRO.

Deborah Williams

3/6/2012

Brownfields Award

FY 2012 SOA funds $31,601 awarded to Yukon Koyukuk School District for Stockpile sampling and environmental site evaluation of Huslia Huntington School. NTP# 18-4002-11-040 approved on this date. Current status: stockpile management and VI investigation word added and extended into 2013, project underway.

Cascade Galasso-Irish

3/22/2012

Exposure Tracking Model Ranking

A new updated ranking with ETM has been completed for source area 78120 Former school ASTs & USTs.

Melinda Brunner

7/5/2012

Document, Report, or Work plan Review - other

OASIS Environmental submitted a draft work plan entitled, "Huslia Huntington School Stockpile Sampling Plan" dated June 20, 2012. The document describes the proposed multi-increment sampling of four stockpiles at the Old Huslia Landfill in 2012. Two of the stockpiles (approximately 1,040 cubic yards and 280 cubic yards, respectively) were generated during the 2010 contaminated soil removal action at the Huslia Huntington School, and contained diesel-range and gasoline-range organics above DEC cleanup levels at that time. The other two stockpiles (approximately 3,000 cubic yards and 230 cubic yards, respectively) to be tested are of unknown origin. The purpose of this sampling is to characterize the piles and/or determine if contaminant levels have decreased below DEC cleanup levels. Brunner reviewed the draft work plan and return comments to OASIS Environmental on July 5, 2012.

Melinda Brunner

7/6/2012

Site Characterization Workplan Approved

Brunner approved OASIS Environmental's work plan entitled, "Huslia Huntington School Stockpile Sampling Plan" dated July 6, 2012. Field work is tentatively scheduled for July 9-12, 2012.

Melinda Brunner

12/20/2012

Document, Report, or Work plan Review - other

OASIS submitted a report entitled "Stockpile Sampling Report, Jimmy Huntington School, Huslia, AK, DRAFT" dated December 6, 2012 on December 6, 2012. The report describes stockpile sampling done at the old Huslia Landfill in July 2012. Brunner returned comments on the draft report to OASIS on December 20, 2012.

Melinda Brunner

3/13/2013

Site Characterization Report Approved

OASIS submitted a final report entitled "Stockpile Sampling Report, Jimmy Huntington School, Huslia, AK," dated March 8, 2013 on March 8, 2013. Brunner approved the document on March 13, 2013. The document describes the results of stockpile sampling done in 2012. No contaminants of concern (i.e. DRO, GRO, BTEX, PAHs) sampled for in the stockpiles were were found in concentrations above DEC cleanup levels.

Melinda Brunner

8/26/2013

Update or Other Action

Copy of report entitled "Stockpile Sampling Report, Jimmy Huntington School, Huslia, AK," dated March 8, 2013 sent to Elsie Vent (Administrator for the City of Huslia).

Melinda Brunner

9/16/2013

Brownfields Award

FY 2014 SOA Capital Improvement Project funds $73,928 awarded for monitoring and potential site closure through stockpile disposal. NTP# 18803602008B. Current status: project initiated, vapor intrusion investigation was also completed.

Cascade Galasso-Irish

10/16/2013

Update or Other Action

ERM Alaska, Inc. submitted a stockpile management plan detailing how three stockpiles that were confirmed free of petroleum-related contaminants above cleanup levels in 2012 will be spread at the Old Huslia Landfill. The three piles are known as Stockpiles 1 and 2 (approximately 1,040 cubic yards and 280 cubic yards, respectively, generated during the 2010 contaminated soil removal action at the Huslia Huntington School), and Stockpile 4 (approximately 230 cubic yards, of unknown origin). Brunner approved the described spreading activities on 10/16/13. ERM intends to spread the stockplies in Fall 2013, and return to seed and fertilze the spread soil in Spring 2014.

Melinda Brunner

10/20/2013

Update or Other Action

ERM Alaska, Inc. completed the spreading of three stockpiles that were confirmed free of petroleum-related contaminants above cleanup levels in 2012 at the Old Huslia Landfill. The three piles are known as Stockpiles 1 and 2 (approximately 1,040 cubic yards and 280 cubic yards, respectively, generated during the 2010 contaminated soil removal action at the Huslia Huntington School), and Stockpile 4 (approximately 230 cubic yards, of unknown origin).

Melinda Brunner

1/9/2014

Document, Report, or Work plan Review - other

ERM, Alaska, Inc. submitted a work plan on 01/07/2014 describing a vapor intrusion investigation scheduled to take place at the Huslia Huntington School in January 2014. Brunner reviewed the document and returned comments to ERM on 01/09/2014.

Melinda Brunner

1/10/2014

Site Characterization Workplan Approved

Finalized workplan by ERM, Alaska, Inc. describing a vapor intrusion investigation scheduled to take place at the Huslia Huntington School in January 2014 approved by Brunner.

Melinda Brunner

1/29/2014

Update or Other Action

Vapor intrusion sampling underway at the Huslia Huntington School.

Melinda Brunner

10/13/2014

Document, Report, or Work plan Review - other

Brunner reviewed ERM’s report entitled, “Air Quality Sampling and Stockpile Management, Huslia Huntington School and Landfarm, DRAFT” dated July 2014 and returned comments to ERM for resolution.

Melinda Brunner

1/5/2015

Site Characterization Report Approved

Brunner approved ERM’s report entitled, “Air Quality Sampling and Stockpile Management, Huslia Huntington School and Landfarm, Final” dated December 2014 on 01/5/15. The document describes the results of outdoor, indoor, and crawlspace air sampling at four Huslia Huntington School buildings (elementary school, high school, vocational education building, and teacher's housing) in January 2014. The analytical results indicate that all the indoor air and crawlspace air samples exceed the DEC Residential Indoor Air Target Levels (RIATLs) for benzene and ethylbenzene. A subset of the samples, including all indoor air samples in the High School,exceeded the RIATL for xylenes. Naphthalene results also exceeded RIATLs in all but one of the samples from the High School and in the indoor air samples from the other three buildings. 1-methylnaphthalene exceeded RIATLs in one crawlspace sample from the High School. Crawlspace and indoor air sample results were compared to determine whether contaminant concentrations attenuate between the crawlspace and the living space. The indoor air results were either comparable to the crawlspace results (Elementary School) or were higher than the crawlspace results (High School, VocEd building). Outdoor air results were compared to indoor air results, and found comparable in the High School and Elementary School. The outdoor air sample results from the Teacher’s House were much higher than the indoor air and crawlspace air results. It is likely that outdoor air contaminant sources are affecting the indoor air samples, especially in buildings that are accessed frequently by students and faculty.

Melinda Brunner

3/23/2015

Meeting or Teleconference Held

Teleconference held with representatives of Yukon-Koyukuk School District (K. Boyd and G. Bourne) and Division of Public Health (A. Hamade and S. Deglin)to discuss 2014 air sampling results for the school. While measured contaminant concentrations were above DEC's Indoor Air Target Levels, Public Health's assessment is that the risk to students and staff is low to very low based on conservative exposure estimates. Since contaminant concentrations in indoor and outdoor air were typically equal to or higher than concentrations in crawlspace air, recommendations to improve the air quality at the school are focused on proper storage of chemicals (e.g. cleaning supplies, paints), proper ventilation, and reducing vehicular traffic around air intakes.

Melinda Brunner

6/29/2017

Update or Other Action

Request for more information sent to Yukon-Koyukuk School District with a deadline of July 28, 2017.

Laura Jacobs

7/12/2017

Meeting or Teleconference Held

DEC notified that YKSD is constructing a new wing to the high school that will house the elementary school in the future. The existing elementary school building will be demolished. Soil cleanup will be included in plans.

Janice Wiegers

5/22/2018

Update or Other Action

ADEC provided guidance to YKSD regarding the need for work plans prepared by a Qualified Environmental Professional for construction activities in a contaminated site.

Laura Jacobs

9/10/2018

Update or Other Action

ADEC CS staff uncovered evidence from a construction report (July 2017) that the AST previously located next to the High School apparently was a source for contamination, with exceedances at 5 ft below ground surface for diesel range organics, benzene, xylenes and ethylbenzene.

Laura Jacobs

9/10/2018

Spill Transferred from Prevention Preparedness and Response Program

Spill transferred by PPRP staff Mike Garrett. Spill no. 17309917404; spill date = 6/23/17; substance = diesel; quantity = unknown; PPRP file no. 820.02.001; description: petroleum contamination was encountered during construction activities in a known contaminated area. Approximate coordinates: 65.701813, -156.38957; datum = WGS84; collection date = 9/10/18; source = CS ArcGIS.com web map.

Mitzi Read

10/8/2018

Meeting or Teleconference Held

ADEC CS and PPR staff met with Shannon & Wilson staff, and staff from the YKSD regarding additional fuel contaminated soils found underneath a UST that had been capped and left in place (see 2011 report from OASIS). Strategies were discussed for additional soil removal, sample collection to confirm and document remaining contaminated soils.

Laura Jacobs

10/9/2018

Leaking Underground Storage Tank Cleanup Initiated - Petroleum

ADEC staff received a Spill Notification form from the Yukon Koyukuk School District for discovery of additional petroleum contamination under a UST left near the Elementary School.

Laura Jacobs

12/3/2018

Document, Report, or Work plan Review - other

ADEC staff received a copy of the Huslia Soil Assessment 2018 Summary Report, Shannon & Wilson.

Laura Jacobs

1/23/2019

Document, Report, or Work plan Review - other

ADEC staff reviewed the "2018 Summary Report, Huslia Soil Assessment" submitted by Shannon & Wilson, December 3, 2018. Comments concern required additional borings to characterize the horizontal and vertical extent of contamination left on school grounds.

Laura Jacobs

6/27/2019

Update or Other Action

Site location was updated on this date. Coordinates for this site are used to determine the presence and position of the site on BLM’s ANCSA Conveyed Land web map.

Rebekah Reams

8/8/2019

Exposure Tracking Model Ranking

A new updated ranking with ETM has been completed for source area 78120 Former school ASTs & USTs.

Laura Jacobs

8/9/2019

Meeting or Teleconference Held

ADEC staff met with the Yukon Koyukuk School District Capitol Projects Manager to discuss funding sources, last year's construction activities, and current understanding of risk to contaminated sites. Both the state and the school district plan to pursue additional funding, and work with consultant to develop a work plan for site characterization.

Laura Jacobs

8/15/2019

Exposure Tracking Model Ranking

A new updated ranking with ETM has been completed for source area 78120 Former school ASTs & USTs.

Laura Jacobs

9/17/2019

Document, Report, or Work plan Review - other

ADEC staff reviewed the document "Vapor Intrusion Assessment, Land Farm Monitoring, and Site Characterization Phased Work Plan" for proposed efforts at this site. Comments were issued for this draft work plan. Five soil-gas samples will be collected from the crawlspace within the combined elementary and high school building. Indoor air samples will be collected from four locations within the building. Land farmed soils will be sampled to determine whether they are ready to be spread outside of the land farm. Shannon & Wilson hopes to complete the work by the end of September or October.

Laura Jacobs

9/25/2019

Document, Report, or Work plan Review - other

ADEC staff approved the final version of the 2019 work plan to include soil gas, crawlspace and indoor air samples collected in the school complex. Also, Yukon-Koyukuk School District approved sampling the landfarmed contaminated soils from the 2018 excavation to determine whether they were ready to be used for cover. Other aspects of site characterization that need to occur do not currently have funding and will be on hold until funding is found.

Laura Jacobs

1/31/2020

Document, Report, or Work plan Review - other

ADEC staff reviewed the revised version of the Vapor Intrusion Assessment and Landfarm Monitoring report. Deviations from work plan were required for landfarm sampling; the results indicate remaining Diesel Range Organics above the clean up level. Vapor intrusion mitigation efforts resulted in contaminants of concern inside the school but not found in the crawlspace samples. This indicates a source of hydrocarbons within the school building, and not resulting from vapors entering the building from the soil or groundwater.

Laura Jacobs

2/20/2020

Document, Report, or Work plan Review - other

ADEC staff reviewed the revised Final Summary Report, Vapor Intrusion Assessment and Landfarm Monitoring, received February 19, 2020. Indoor, outdoor and sub-soil gas samples were collected in and around the Huslia Huntington School Complex. Naphthalene was detected in exceedance of indoor air residential target levels in the school commons and gym. Several other contaminants of potential concern were detected in indoor air below target levels. Naphthalene was not detected in sub-soil gas samples in the crawlspace which rules out vapor intrusion from petroleum-contaminated soil beneath the school. Landfarmed soils were sampled but because the soil was too soggy, additional sampling will be required prior to moving soils out of the landfarm for use.

Laura Jacobs

8/23/2021

Document, Report, or Work plan Review - other

ADEC received a proposed work plan from the QEP to fly to Huslia and sample the landfarm. Samples will be collected and field screened for the highest value. Those samples will be collected for analysis of diesel range organics, gasoline range organics, residual range organics, benzene, toluene, ethylbenzene, and xylenes, and one sample for polynuclear aromatic hydrocarbons. A brief sample report will be sent when results are received from the laboratory.

Laura Jacobs

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Hazard ID	Site Name	File Number
25631	Huslia Huntington School Landfarm	820.38.002
27127	Huslia Huntington School Fuel Transfer Pipeline	820.38.008

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Alaska Department of Environmental Conservation

Site Report: Huslia Huntington School Complex

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State of Alaska Department of Environmental Conservation