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Site Report: Umiat Landfill and Seasonal Slough

Site Name: Umiat Landfill and Seasonal Slough
Address: Unknown, Nuiqsut, AK 99789
File Number: 335.38.001
Hazard ID: 781
Status: Active
Staff: Kelly Walker, 9074512166 kelly.walker@alaska.gov
Latitude: 69.364706
Longitude: -152.120815
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 8-acre Umiat Landfill is located in an intermittently-flooded side drainage channel of the Colville River on property owned by the Alaska Department of Transportation & Public Facilities and the Bureau of Land Management. The landfill contains approximately 400 tons of junk equipment and scrap metal, and approximately 86,600 crushed drums. The buried debris is known to include contaminant sources such as lead-acid batteries, transformers, and drums/containers with unknown contents that may have leaked and contaminated the underlying soils. The Colville River curves around the area with the landfill, and floods across the surface of the landfill annually; a seasonal stream runs through it during high water. A seasonal slough runs from the north end of the landfill to the Colville River. Soil contaminants include petroleum, PCBs, chlorinated pesticides, arsenic, beryllium and lead. Groundwater contaminants include DRO and GRO. PCBs have been detected in slough sediments. Fish tissue studies show somewhat elevated levels of PCBs in burbot caught in the slough and in the Colville River in the vicinity of the slough. Debris is being exposed by erosion of the surface of the landfill, including drums, batteries, and vehicle parts. A small transformer was found in 2001, and was leaking PCB oil. The transformer and affected soil were removed, but additional containerized hazardous substances may be present in the landfill and are threatened by continuing erosion. The landfill is located in an active seasonal streambed of the Colville River, east of the main gravel pad, approximately mid-way between the main gravel pad and the Colville River, on both sides of the gravel road that connects the main gravel pad to the Colville River. The landfill is approximately 3000 feet long from the northern tip to the southern tip and about 1500 feet wide from east to west. See Umiat Former Air Force Station, reckey 198931X902511, for actions prior to June 2004. Prior to this time, the entire Umiat facility was managed as one site. In June, 2004, the facility was broken out into separate sites for the Main Gravel Pad, Airstrip Complex, Landfill and Seasonal Slough, 11 former Navy Test Wells, and Umiat Lake.

Action Information

Action Date Action Description DEC Staff
6/7/2004 Site Added to Database Multiple contaminants. Tamar Stephens
9/10/2007 Update or Other Action Tamar Stephen (DEC) conducted a site visit by helicopter along with Corps of Engineers project manager Mary Jemin and project engineer Bob Haviland. Tamar Stephens
10/25/2007 Meeting or Teleconference Held Contaminated sites staff Tamar Stephens attended Barrow Restoration Advisory Board Meeting. Tamar Stephens
3/12/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Tamar Stephens
6/6/2008 Document, Report, or Work plan Review - other The Corps of Engineers forwarded a copy of a summary report prepared by their hydraulics and hydrology group evaluating the stability of the Umiat landfill and proposing strategies to stabilize it. The report is based on flow rate data from a stream gauge installed in the Colville River at Umiat, aerial photographs, reports from visual observations and computer modeling. It notes that the main channel of the Colville River has historically migrated across the two-mile width of the flood plain and the landfill shows evidence that it is regularly flooded during high water events. The report states: "The main channel location seems to have been fairly stable during the period of 1955-2007 however the Colville River main channel can and will migrate into the old landfill area at some time in the future. The old landfill lies in a low area adjacent to the main channel." United States Geological Survey personnel observed the river in this area during a recent break-up and saw flow throughout the landfill area estimated to be 3 to 4 feet deep and flowing around 8 to 10 feet per second; flow rates of 2 to 4 feet per second will easily erode the native sands and gravel used as landfill cover. The report also notes that aerial photos show a clear path thru the brush to the landfill and then downstream to a small channel that connects to the main Colville River channel. The report states that the channel may represent a head cut that could migrate upstream possibly connecting to the main channel; should this happen it is possible that this small channel could widen and become a major channel of the river. Various strategies were suggested for slowing the flow rate of water across the surface of the landfill to reduce erosion. Relocation of the landfill to a more stable upland area was recommended. Tamar Stephens
7/10/2008 Meeting or Teleconference Held Contaminated sites staff Tamar Stephens attended Barrow Restoration Advisory Board Meeting. Tamar Stephens
10/13/2008 Meeting or Teleconference Held Contaminated sites staff Tamar Stephens attended Barrow Restoration Advisory Board Meeting. Tamar Stephens
9/17/2009 Meeting or Teleconference Held Contaminated sites staff Tamar Stephens attended Barrow Restoration Advisory Board Meeting. Tamar Stephens
3/12/2010 Update or Other Action Contaminated sites staff helped prepared a fact sheet on the eroding landfill at Umiat. The identifies the urgency and magnitude of the problem, summarizes the importance of the Colville River, and provides estimated costs to relocate the landfill. Tamar Stephens
3/18/2010 Meeting or Teleconference Held Contaminated sites staff Tamar Stephens attended Barrow Restoration Advisory Board Meeting. Tamar Stephens
6/17/2010 Meeting or Teleconference Held Contaminated sites staff Tamar Stephens attended Barrow Restoration Advisory Board Meeting. Tamar Stephens
10/1/2010 Update or Other Action Umiat Landfill Project and West Foothills Road Project (“Road to Umiat”) coordination update: The United States Army Corps of Engineers (USACE) completed a landfill survey in late summer to collect information necessary for the design phase of the landfill project. USACE reported last week that they have awarded a contract for Technical Project Planning (TPP) and Uniform Federal Policy Quality Assurance Project Plans meetings to take place beginning this fall in Fairbanks. The TPP meetings will involve multiple agencies that will have some role during the landfill project, principally Alaska Department of Transportation and Public Facilities (ADOT), DEC, Bureau of Land Management, USACE, Alaska Department of Fish and Game, the Alaska Department of Natural Resources, and the North Slope Borough Planning Department. One goal of the TPP meetings is to ensure that the two projects do not impede each other and instead to identify ways the projects can support each other through sharing of resources (e.g., camp facilities, data generated during studies, or construction of ice roads). ADOT is issuing a third-party RFP to do an Environmental Impact Statement for the road project. ADOT and USACE are working to share relevant information. Early in the road project process, ADOT obtained copies of several reports from DEC from various investigations at Umiat by USACE over the past 15 or so years that contain information applicable to the Umiat end of the road project. ADOT has provided USACE with wetlands plot information showing wetland type and soil data developed during ADOT field work at Umiat this summer. Tamar Stephens
10/1/2010 Update or Other Action Umiat Landfill Project and West Foothills Road Project (“Road to Umiat”) coordination update: The United States Army Corps of Engineers (USACE) completed a landfill survey in late summer to collect information necessary for the design phase of the landfill project. USACE reported last week that they have awarded a contract for Technical Project Planning (TPP) and Uniform Federal Policy Quality Assurance Project Plans meetings to take place beginning this fall in Fairbanks. The TPP meetings will involve multiple agencies that will have some role during the landfill project, principally Alaska Department of Transportation and Public Facilities (ADOT), DEC, Bureau of Land Management, USACE, Alaska Department of Fish and Game, the Alaska Department of Natural Resources, and the North Slope Borough Planning Department. One goal of the TPP meetings is to ensure that the two projects do not impede each other and instead to identify ways the projects can support each other through sharing of resources (e.g., camp facilities, data generated during studies, or construction of ice roads). ADOT is issuing a third-party RFP to do an Environmental Impact Statement for the road project. ADOT and USACE are working to share relevant information. Early in the road project process, ADOT obtained copies of several reports from DEC from various investigations at Umiat by USACE over the past 15 or so years that contain information applicable to the Umiat end of the road project. ADOT has provided USACE with wetlands plot information showing wetland type and soil data developed during ADOT field work at Umiat this summer. Tamar Stephens
10/13/2010 Meeting or Teleconference Held Contaminated sites staff Tamar Stephens attended Barrow Restoration Advisory Board Meeting. Tamar Stephens
11/10/2010 Meeting or Teleconference Held Contaminated sites staff Tamar Stephens, Melanie Forbes, and John Halverson attended the first Remedial Investigation Technical Planning Meeting for the Umiat Landfill site on 11/10/2010. The meeting was attended in person or by teleconference by several representatives for the U.S. Army Corps of Engineers (USACE), consultants for USACE, the Bureau of Land Management, Alaska Department of Transportation, and North Slope Borough Planning Department. The meeting opened with a summary of past investigations of the landfill and the down-gradient seasonal slough, and fish tissue studies resulting from potential risks for eating fish exposed to polychlorinated biphenyl (PCB) contamination in the slough. The purpose of the meeting was to identify the remedial investigation planning project goals. The overall conclusion reached at this meeting is that there is probably sufficient chemical data collected during past investigations, and that the biggest data gaps are lack of information sufficient to model erosion control measures, and the need for further geophysical investigation to verify the boundaries of the landfill. USACE staff collected the information necessary to do the erosion modeling during September 2010; a report with analysis of that data will be developed over the winter. Tamar Stephens
11/30/2010 Document, Report, or Work plan Review - other Contaminated Sites (CS) staff Tamar Stephens reviewed and sent an approval letter for a final Focused Feasibility Study (FFS) report for Umiat Test Wells 3, 4, 6, 7, 8, 10, and 11. The draft report was written in 2003, but finalization of the report was never done until recently. The final report responded to comments made by CS staff seven years ago, and was finalized for the purpose of supporting a decision document. The test wells in the FFS all share similar characteristics in that they have either very limited pads or no pads, are surrounded by tundra, and have small volumes of soil that are contaminated with weathered fuel products. Accessing the sites to conduct any cleanup would require helicopter access or winter ice roads. The FFS evaluates five alternatives for treatment of soil at these sites, and concludes with the recommendation for no further action based on lack of risk. The department approved the Proposed Plan seven years ago, and a public meeting was held at the time, also recommending no further action at these well sites. Tamar Stephens
12/3/2010 Meeting or Teleconference Held Contaminated sites staff Tamar Stephens attended Barrow Restoration Advisory Board Meeting. Tamar Stephens
2/9/2011 Update or Other Action Contaminated Sites staff prepared a briefing outline for Section Manager Jennifer Roberts with an update on the Umiat Landfill to summarize communication, coordination, and sharing of information and resources between the department, the US Bureau of Land Management, the Alaska Department of Transportation and Public Facilities (ADOT&PF), and the US Army Corps of Engineers (USACE) regarding the Umiat Landfill project (a federal project managed by USACE under the Formerly Used Defense Sites Program) and the Foothills West Transportation Access (“Road to Umiat”) project (a state of Alaska construction project currently in the design stage by ADOT&PF). Staff from these four agencies have been in communication and have coordinated sharing of information and resources a number of times over the past two years with the overarching objectives of ensuring that the two projects do not interfere with each other, and identifying ways that the two projects can support and facilitate each other, within the legal constraints on how respective funding for the projects may be used. Tamar Stephens
3/17/2011 Meeting or Teleconference Held Contaminated sites staff Tamar Stephens attended Barrow Restoration Advisory Board Meeting. Tamar Stephens
5/17/2011 Meeting or Teleconference Held Contaminated Sites staff Tamar Stephens attended an Environmental Impact Study (EIS) kickoff meeting for the Foothills West Transportation Access (Road to Umiat). The meeting was attended by representatives from several federal and state agencies and several consultants. The purpose of the meeting was to provide a project overview, make connections between the project team and agencies, and lay the foundation for successful completion of the EIS. One of the most critical technical challenges of the project will be potential impacts of bridge construction across the Colville River on erosion at the Umiat landfill and/or potential impacts of landfill erosion control measures and ultimate removal on the bridge footings. CS staff presented an overview of contamination present and related cleanup issues at Umiat. Tamar Stephens
6/20/2011 Meeting or Teleconference Held Contaminated sites staff Tamar Stephens participated in a Technical Project Planning (TPP) meeting for remedial investigation at the Umiat Landfill. Staff from the Alaska Department of Transportation and Public Facilities (ADOT&PF) from the Foothills West Transportation Access (aka “Road to Umiat”) project attended in person and by teleconference. The Corps of Engineers presented preliminary results of a recent hydrologic study and of a recent geophysical study. The hydrologic study modeled flow patterns for 22-year and 100-year flood scenarios and evaluated how the flow patterns and flow velocity would be affected by three potential erosion control strategies. The geophysical study confirmed the horizontal boundaries of the landfill and provided data to better refine volume estimates for landfill wastes. Both of the reports are anticipated to be issued in draft form by the end of July. A hydrologist for the Bureau of Land Management was unable to attend the meeting, but provided recent photographs showing additional erosion at the landfill from flooding during May 2011. CS staff and the Corps of Engineers agreed that a regular monitoring program needs to be established at the Umiat Landfill to visually monitor progression of erosion and to identify and remove potentially hazardous items that are exposed by erosion, rather than relying on ad hoc reports from people who are at Umiat for other purposes. Considerable discussion occurred between CS staff, the Corps of Engineers, and ADOT&PF staff on how the Umiat Landfill project and the “Road to Umiat” project can support each other. ADOT&PF offered to share results of their recent work on evaluation of potential borrow sources near Umiat. All agreed that the projects cannot become interdependent on each other, but the free and open exchange of information and sharing of study results has benefitted and will continue to benefit both projects. Issues identified include clarification of land ownership of the Umiat Landfill; site access for ongoing investigation and for implementing interim and final remedies; identification of a location for a new landfill; and identifying what studies are needed to plan the ultimate removal of the landfill. The date of the next TPP meeting was not established, but will be in the near future. Tamar Stephens
7/28/2011 Site Visit John Halverson (DEC), Lisa Giest, Craig Scola, Dee Ginter and Aaron Shewman (Corps of Engineers) and Chris Darrah (Shannon and Wilson) conducted a site inspection at the Umiat FUDS. At the landfill area scattered drums, a few lead acid battery plates, metal debris were exposed on the ground surface above the known disposal areas. The spring flooding in 2011 was significant and the sand/cobble cover in the slough and along the shoreline had shifted from last year. Corps staff conducted survey transects along the slough and landfill area documenting site conditions and looking for hazardous materials. No obvious hazardous materials were found other than the battery plates and potential material in drums (drums that were breached appeared to contain soil) but not all could be inspected. Inspection at Test Well #9 revealed some ponded water in the lowest areas excavated adjacent to the surface water drainage. Excavated and exposed soils up-slope were dry, contained small to large cracks, and showed some sign of surface erosion. The site was evaluated for further site characterization and cleanup options. Inspection photos and summary are in the project file. John Halverson
5/7/2012 Document, Report, or Work plan Review - other DEC reviewed and sent review comments in a letter dated 5/7/2012 on the First Draft Remedial Investigation Report, Former Umiat Air Force Station Landfill, Umiat, Alaska. DEC received this report on March 12, 2012. This report compiles and summarizes information from multiple environmental and geophysical investigations that have been performed at the Umiat landfill and recommends that the U.S. Army Corps of Engineers should implement interim remedial actions to control erosion and/or permanent remedial actions to prevent release of contaminants to the environment. Tamar Stephens
6/5/2013 Update or Other Action Entered Location information in CSP database for display on CS Web Map. Willett Boger
8/13/2013 Site Visit Debenham participated in a site visit to Umiat with the U.S. Army Corps of Engineers. Site visit activities included an annual inspection of the Landfill and a visit to the Test Well 9 site. At the Landfill site we performed a visual inspection for signs of recently exposed potential hazardous waste sources. Site conditions were documented in the field notes and photographs were taken at GPS located vantage points and landmarks. These photos will be compared to photos taken at the same locations in previous years to document physical changes at the site due to seasonal flooding. At the Test Well 9 site, we inspected erosion control measures placed after removal activities were completed last winter. Melody Debenham
8/20/2013 Meeting or Teleconference Held Melody Debenham attended RAB meeting in Nuiqsut. Melody Debenham
4/7/2014 CERCLA FS Received Draft Feasibility Study Report, Umiat AFS Landfill. John Carnahan
6/4/2014 Site Characterization Report Approved Final Remedial Investigation Report, Former Umiat AFS Landfill, reviewed and approved by DEC. Summary report documented that contaminants were detected above acceptable risk levels and regulatory limits, and landfill erosion is an on-going process. Further action is required to prevent erosion and future contaminant migration. A Feasibility Study is forthcoming. John Carnahan
10/3/2014 Update or Other Action Project oversight changed to Carnahan. John Carnahan
10/6/2014 Document, Report, or Work plan Review - other Finalized comments on Draft Feasibility Study Report, Umiat AFS Landfill, and sent letter with accompanying DEC Comment Table to USACOE in response. John Carnahan
10/6/2014 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 71760 Umiat Landfill and Seasonal Slough. John Carnahan
10/10/2014 Meeting or Teleconference Held Brief meeting by USACOE with BLM and DOT online to summarize current status of Umiat landfill work. John Carnahan
11/19/2014 Meeting or Teleconference Held Meeting to discuss comments between USACOE, S&W and DEC regarding draft feasibility study from March 2013. Revised FS will be provided that incorporates comments in approximately mid-December with possible distribution for public comment. John Carnahan
12/15/2014 Update or Other Action USACOE was not able to meet mid-December timeframe for draft Feasibility Study. New timeline for submittal is mid-January. John Carnahan
2/17/2015 Meeting or Teleconference Held Attended RAB meeting Corps of Engineers FUDS program in Nuiqsut. Discussed status of Umiat sites. Melody Debenham
8/4/2015 Document, Report, or Work plan Review - other Provided response to comments for March 2014 review comments, comments on May 2015 Interim Final FS, and ARAR tables, to USCOE for review. John Carnahan
8/19/2015 CERCLA FS Received Interim Final Feasibility Study for review and comment. Second draft beginning March 2014. This dated May 2015. John Carnahan
8/26/2015 Update or Other Action Provide response to consultant comments on Draft and Interim Final FS documents. John Carnahan
11/5/2015 Update or Other Action Sent request for more aggressive action at Umiat Landfill than was currently proposed as per review of Joint Execution Plan review. John Carnahan
9/29/2016 Meeting or Teleconference Held Barrow RAB Meeting held. Debenham in attendance. John Carnahan
12/1/2016 Meeting or Teleconference Held CS managers participate in the annual FUDS site management action plan meeting. The purpose of the is to collaborate with FUDS management on site progress and prioritization for all of the formerly used defense sites. FUDS prioritization is based on risk, congressional interest, state input and proximity to other sites on the prioritization list. FUDS has increased environmental restoration funding in Alaska for the 2017 and 2018 field seasons to meet National goals for site progress. Darren Mulkey
12/8/2016 Meeting or Teleconference Held Meeting at BLM offices with COE, DEC, BLM and DOT to discuss the results of the Feasibility Study and review options for the Proposed Plan. Next meeting scheduled for February 2017. John Carnahan
2/2/2017 Update or Other Action Umiat stakeholder meeting with COE< BLM, DOT, and DNR at BLM offices. Discuss path forward. John Carnahan
3/7/2017 Meeting or Teleconference Held Meeting with USCOE, BLM, DNR and DOT to discuss the status of the LF project. Meeting facilitated by USCOE. John Carnahan
5/11/2017 Meeting or Teleconference Held Umiat LF meeting held at DNR offices. Agenda located in file and meeting minutes forthcoming. Discussed elements of successful LF project, including cleanup criteria. New location for LF proposed. John Carnahan
6/14/2017 Document, Report, or Work plan Review - other Approve work plan for groundwater monitoring of onsite monitoring wells, and installation of additional temporary points. John Carnahan
6/19/2017 Site Visit Site visit to inspect multiple locations with USCOE representatives. Hike to site locations and inspect current status and recovery. John Carnahan
10/15/2017 Update or Other Action Coordination with RPM during JEP development included planning for future work and budgeting. John Carnahan
11/29/2017 Meeting or Teleconference Held BLM led meeting to discuss current status of landfill remediation project. Draft proposed plan pending submittal for review by mid December. John Carnahan
12/18/2017 CERCLA Proposed Plan DEC receives DRAFT Proposed Plan for review and comment. John Carnahan
2/12/2018 CERCLA Proposed Plan Proposed Plan has been reviewed and comments provided. Public comment period between 2/12 and 4/23/2018. The Proposed Plan and supporting documentation are available at the information repository located at the Native Village of Nuiqsut Office, Nuiqsut, Alaska (907) 480-3010. The Proposed Plan can also be viewed online at http://www.poa.usace.army.mil/ John Carnahan
4/23/2018 Update or Other Action Proposed Plan public comment period extended to this date. John Carnahan
11/9/2018 Update or Other Action DEC received coyp of draft Umiat LF decision document. John Carnahan
12/6/2018 CERCLA FS Received copy of FEASIBILITY STUDY ADDENDUM REVISED CONCEPTUAL APPROACH AND COST ESTIMATES FOR ALTERNATIVE 6 AND ALTERNATIVE 7 UMIAT AIR FORCE STATION LANDFILL. The date on this is August 2017 but the DEC had not received a copy of this document. John Carnahan
1/4/2019 Update or Other Action Provide comments to COE on Draft Decision Document. John Carnahan
2/12/2019 Meeting or Teleconference Held Meeting in DEC offices to discuss USCOE response to comments on Umiat Landfill ROD. John Carnahan
4/17/2019 Update or Other Action Restoration advisory board (RAB) meeting held in Utqiagvik. Update provided on Umiat and others. John Carnahan
11/13/2019 Meeting or Teleconference Held DEC staff participated in the Restoration Advisory Board meeting in Nuiqsut, where the U.S. Army Corps of Engineers discussed planned activities for Umiat FUDS sites. Melinda Brunner
3/11/2020 CERCLA ROD Approved DEC sent an acknowledgement of receipt on 11 March 2020 to the U.S. Army Corps of Engineers for the "Decision Document; Hazardous, Toxic, and Radioactive Waste; Project #Fl 0AK.0243-08; Umiat Air Station Formerly used Defense Site, Umiat, Alaska" dated September 2019. The document describes USACE's intent to excavate debris and contaminated soil at the landfill; treat and/or dispose of contaminated soil; create a monofill for inert debris; and assess groundwater. Melinda Brunner
6/14/2022 Meeting or Teleconference Held RAB meeting held in Nuiqsut to discuss the Umiat Landfill site status and update community on upcoming plans for work. In attendance, either via teleconference or in person, BLM, FUDS, DEC, and members of North Slope communities. The selected remedy from the ROD and the project timeline were discussed in great detail. Meeting minutes and materials are on file on the USACE Umiat RAB meetings website. Kelly Walker
7/6/2022 Site Visit DEC, FUDS, and BLM conducted a site visit to view the status of the landfill and surrounding area. Erosion of the landfill cap is occurring throughout the area, debris is visible aboveground in numerous locations. Known monitoring wells were located and locations were recorded via GPS. Kelly Walker
2/7/2023 Meeting or Teleconference Held Regional Advisory Board Public Meeting held in Nuiqsut, AK. Meeting participants included representatives from the RAB, FUDS, BLM, DEC, and USACE. FUDS presented the planned remedy for the removal of the Landfill at Umiat. Project is still in early planning stages, project is not planned to commence until 2027. Kelly Walker
6/7/2023 Meeting or Teleconference Held DEC staff met with USACE, BLM and DOT to discuss the status of the project and to receive an updated schedule. Kelly Walker
7/21/2023 Meeting or Teleconference Held Meeting held with USACE, ADEC, BLM, and Paragon-Central Joint Venture Team to discuss the initial remedial design phase of the landfill relocation project for the former Umiat Air Force Station. Items discussed included contract requirements, remedial design framework, and the upcoming site visit and landfill inspection. Kelly Walker
8/15/2023 Site Visit DEC, BLM, USACE, and contracting staff conducted the annual landfill inspection at Umiat AFS August 15-16. Staff walked the footprint of the former landfill area to inspect condition of cap and to note uncovered debris and status of former monitoring wells. Additionally, the proposed borrow area was inspected and evaluated for possible backfill useage during restoration phase of the project. Staff also walked/hiked to the proposed monofill locations for the inert debris excavated from the former landfill. Kelly Walker
11/15/2023 Meeting or Teleconference Held The November 2023 Regional Advisory Board meeting was held to discuss the remedial design phase of the Umiat Landfill Removal FUDS Project. In attendance were members of the public, BLM, DEC, DNR, DOT, USACE, ASRC, Kuukpik Corporation, and North Slope Borough. The overall status of the project was discussed in addition to upcoming RAB meeting dates were discussed. Meeting minutes will be compiled and posted publicly upon completion. Kelly Walker

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