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Site Report: AT&T Alascom Delta Junction Station

Site Name: AT&T Alascom Delta Junction Station
Address: Mile 1422 Alaska Highway, Delta Junction, AK 99737
File Number: 120.38.008
Hazard ID: 2944
Status: Active
Staff: Dawn Wilburn, 9072628200 dawn.wilburn@alaska.gov
Latitude: 64.037868
Longitude: -145.730072
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

1997 This site was opened, after real estate transaction due diligence identified petroleum-impacted soils. 2007 The site was closed in 2007 with a condition to notify the ADEC if Building 2 was removed in order to address residual DRO impacts in soil located adjacent to the building and at depth. DRO/GRO contaminated soils were found at the former truck fill stand and waste oil contaminated soils at the former drum storage area. Total of 340 cubic yards. Site acreage is 2.7. One area of contamination remaining under a building. PacifiCorps is negotiating to remove the building. Once the building is removed the contaminated soil under the building will be assessed and remediated. September 2020, Building 2 was demolished, including the concrete foundation. Samples collected from the building footprint within the top 2 feet of soil and of demolition waste, such as concrete floor and foundation were sampled. Three soil samples were collected from approximately 18 inches beneath the former concrete foundation and a concrete sample was collected to characterize demolition debris for disposal. The soil samples and concrete sample were analyzed for DRO, RRO, PCBs, and lead. Maximum concentrations of DRO, RRO, total PCBs, and lead in the three soil samples were 914 mg/kg, 3,990 mg/kg, 59.9 mg/kg, and 2,100 mg/kg, respectively. The concentrations in the concrete sample were 687 mg/kg for DRO, 796 mg/kg for RRO, and 59.9 mg/kg for PCBs. June 8, 2021 to August 11, 2021 Excavation, removal, and transport of impacted soil occurred. Three areas were excavated: former Building 2 footprint for PCB impacts. Former fuel line area and former Building 2 footprint for DRO impacts. Approximately 230 cubic yards of PCB-impacted soil were excavated from the former Building 2 footprint. 75,225 kilograms of concrete with PCB contamination was removed during pre-excavation demolition activities and also was disposed. Approximately 735 cubic yards of DRO-impacted soil were excavated from the former fuel line area. Approximately 397 cubic yards of DRO-impacted soil were excavated from the former Building 2 footprint. Further soil characterization to the west side of the site and groundwater will be sampled for in September 2022.

Action Information

Action Date Action Description DEC Staff
6/23/1998 Site Ranked Using the AHRM Initial ranking by staff. Anne Marie Palmieri
6/23/1998 Update or Other Action Site accepted into the Voluntary Cleanup Program. Action rescinded and changed to Update on 1/29/03. Anne Marie Palmieri
7/2/1998 Site Added to Database DRO/GRO contaminated soils. Anne Marie Palmieri
2/27/2003 Update or Other Action Responsible Party field changed based on new information from PacificCorp Environmental Remediation Company. Elizabeth Stergiou
5/27/2005 Update or Other Action After reviewing the 2000 corrective action report, it appears that one area has contamination remaining under a building that will require assessment/remediation when the building is removed. Sent e-mail to Brandon Smith (PacifiCorp) requesting a project status update. Donald Seagren
6/7/2005 Update or Other Action E-mail from Brandon Smith.Will try for full closure. Building will need to be demolished. Asbestos survey in building required prior to demolition. Developing work plan for building assessment, demolition and then assessment & excavation of contaminated soils. Donald Seagren
7/27/2005 GIS Position Updated Using Figures 1.2 and 1.3 from a Phase II Site Investigation Delta Junction Terminal Station from Woodward-Clyde, dated December 29, 1997 in conjunction with TopoZone Pro, entered the coordinates for this site. Metadata include No Topo Basemap, TopoZone Pro Street Map, Black and White Aerial Photo, on a Medium Size Map, View Scale 1:10,000, Coordinate Datum, NAD83. High degree of confidence in accuracy of location. Alyce Hughey
8/1/2005 Update or Other Action Have not received a work plan. Sent an e-mail inquiring into the development of the work plan for demolition and then assessment and remediation of the contaminated soils. Donald Seagren
12/16/2005 Update or Other Action Have not received any response. Sent an e-mail to the consultant and AT&T to let ADEC know what thier plans are for achieving site closure. Work plans should be submitted and approved this winter for implementation after breakup in 06. Donald Seagren
12/20/2005 Update or Other Action Received e-mail from Brandon Smith. He stated they are till negotiating whether or not to demolish the building and who will be responsible for it. Until building is removed, contamination under the building cannot be accessed. Donald Seagren
8/25/2006 Cleanup Plan Approved Review and approved soil cleanup plan. Donald Seagren
9/22/2006 Update or Other Action Approved transport of 225 tons of petroleum contaminated soil to OIT in Fairbanks for thermal remdiation Donald Seagren
4/6/2007 Exposure Tracking Model Ranking Donald Seagren
7/11/2007 Site Characterization Report Approved Reviewed Construction Completion Report & 06 Interim Soil Remediation Report. All accessible contaminated soil has been removed and thermally remediated at OIT in Fairbanks. Contaminated soil remains beneath the Power Building. Additional assessment &/or corrective action will be required should this soil become accessible. No GW encountered. A conditional closure letter will be written for this site. Donald Seagren
7/19/2007 Conditional Closure Approved Conditional closure approved. Contaminated soil remains under the power building exceeding cleanup levels. additional assessment required if building is ever removed. Groundwater was not encountered at this time. Donald Seagren
7/19/2007 Institutional Control Record Established Administrative update (10/25/07) Evonne Reese
6/12/2008 Update or Other Action Site transferred from Don Seagren to Paul Horwath per Linda Nuechterlein. Alyce Hughey
11/14/2011 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 73919 Misc spills/releases. Alyce Hughey
11/10/2014 Update or Other Action Staff changed from Paul Horwath to IC Unit. Kristin Thompson
1/2/2015 Institutional Control Update An IC reminder letter was issued to the responsible party on this date. Kristin Thompson
8/27/2015 Institutional Control Compliance Review IC compliance review conducted, an IC reminder letter was send in January of 2015. The reminder system has been set up to send reminder letters on a recurring basis. Evonne Reese
8/5/2020 Institutional Control Compliance Review IC Reminder sent to AT&T SH&S on this date. 5 year review on land use, next compliance review due August 2025. Cascade Galasso-Irish
10/1/2020 Institutional Control Update Communicated with the responsible party's consultant and I was informed that they are planning on doing a thorough investigation of the building footprint later this fall. They will send us a work plan prior to the field investigation and assessment. I told her that this was acceptable and would document it in the site record. Evonne Reese
10/8/2020 Institutional Control Update During the former building footprint characterization PCB contaminated soil and concrete were identified. The field identifiable contaminated soil has been placed on a liner and is covered. A cost estimate is being put together for conducting the the additional work. These details will be included in the upcoming work plan submittal. EPA is being coordinated with for the PCB concrete disposal and also on some TCLP lead issues. Evonne Reese
3/3/2021 Update or Other Action During the September 2020 building demolition and upon removal of the concrete slab, the demolition contractor collected soil samples for diesel range organics (DRO), residual range organics (RRO), polychlorinated biphenyls (PCBs) and lead. Following building demolition, the building footprint was covered with plastic sheeting to protect the soil from erosion and foot/vehicle traffic. No direct source has been found for PCBs in the soil, but AT&T historical records show that there used to be a mounted transformers in the 1970s in the area but that still doesn’t provide a direction correlation. By late 2020, weather conditions prevented any assessment field work, and the demolished building footprint was covered a pitched platform draped with plastic sheeting to further protect this area over the winter. DEC should receive a workplan from AT&T in the next week or two. Evonne Reese
3/30/2021 Document, Report, or Work plan Review - other Sent RP comments on Draft Site Characterization Work Plan Power Building (Building 2) Delta Junction Terminal Station Delta Junction, Alaska, dated March 2021. Jessica Hall
4/5/2021 Site Characterization Workplan Approved Sent RP the approval letter for the Draft Site Characterization Work Plan Power Building (Building 2) Delta Junction Terminal Station Delta Junction, Alaska, dated April 2021. Field work planned to be initiated this week. Jessica Hall
6/8/2021 Document, Report, or Work plan Review - other Sent RP ADEC Comments on Site Characterization Report and Corrective Action Plan, Dated May 2021. Requested updated report to incorporate comments for ADEC approval. Jessica Hall
6/16/2021 Site Characterization Workplan Approved Sent RP approval letter for Site Characterization Report and Corrective Action Plan, Dated June, 2021. Field work is under way currently. Jessica Hall
12/20/2021 Document, Report, or Work plan Review - other Send comment letter for “Corrective Action Report”, dated December, 2021. Requested an updated report be submitted for review. Jessica Hall
4/25/2022 Update or Other Action ADEC sent response to comment on response to comments for Corrective Action Report, dated December 2021, received via electronic mail April 12, 2022. ADEC requested an updated report be submitted for review. Soils are still exceeding migration to groundwater (MTG) associated with the former UST area, “0” line, and the western wall of the former fuel line area. The RP has requested closure and ADEC advised that groundwater will need to be characterized at the site due to MTG exceedances at the site. Jessica Hall
8/18/2022 Document, Report, or Work plan Review - other Sent Alascom Network Eng & Operations comments on Corrective Action Report, dated May 2022. Requested a workplan for remaining contamination on site. ADEC requests additional site characterization, assessment, monitoring, and corrective action, based on the results of the soil sampling thus far. The remaining soil locations requiring further characterization are listed as follows: 1.21-DJT-B1SO-3-5a.This sample location exceeds for DRO at 2,260 mg/kg, which exceeds Migration to Groundwater Cleanup level of 250 mg/kg. b. This location has not been vertically characterized for soils. 2.21- DJT-Z2.5SO-6-8a. This sample location exceeds for DRO at 2,420 mg/kg, which exceeds Migration to Groundwater Cleanup level of 250 mg/kg. b. This location has not been horizontally characterized for soils to the west of this location. 3.21-DJT-Y1.5-SO-6-8 a. This sample location exceeds for DRO at 1,720 mg/kg, which exceeds Migration to Groundwater Cleanup level of 250 mg/kg. b. This location has not been horizontally characterized for soils to the west of this location. 4.21-DJT-Y3SO-8-10 a. This sample location exceeds for DRO at 29,300 mg/kg, which exceeds Human Health Cleanup level of 10,250 mg/kg. b. This location has not been horizontally characterized for soils to the north of this location. 5.21-DJT-DE0SO-0-2 a. This sample location exceeds for DRO at 365 mg/kg, which exceeds Migration to Groundwater Cleanup level of 250 mg/kg. b. This location has not been horizontally characterized for soils to the north of this location. Jessica Hall
8/19/2022 Document, Report, or Work plan Review - other ADEC sent Alascom Network Eng & Operations comments on the “Groundwater Characterization Work Plan Addendum”, dated July 2022. ADEC requested an updated work plan be submitted. Jessica Hall
8/25/2022 Site Characterization Workplan Approved ADEC sent Alascom Network Eng & Operations approval on the “Groundwater and Supplemental Soil Characterization Work Plan Addendum”, dated August 24, 2022. Field work to start by September 2022. Installation and sampling of three monitoring wells, and the advancement of five soil borings to complete delineation of soil impacts will occur. Soil boring will be to the west, north west, north and north east. Groundwater and soils will be analyzed for DRO, PAHs, and VOCs. Jessica Hall
11/4/2022 Update or Other Action Approval granted for onsite disposal of IDW soil and groundwater that did not contain contaminants above the most stringent cleanup levels Bill O'Connell
3/17/2023 Site Reopened Site reopened to document additional characterization and cleanup that occurred from 2020 to 2022. Bill O'Connell
3/20/2023 Site Characterization Report Approved Reviewed supplemental site characterization report for AT&T Alascom Delta Junction Station. Eight soil borings were installed to characterize areas of soil contamination previously identified at the site. Three of the boreholes were completed as monitoring wells to evaluate impacts to groundwater. The soil sampling successfully delineated the extent of soil contamination and samples from the groundwater monitoring wells did not contain detectable concentrations of contaminants. Bill O'Connell

Contaminant Information

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

Control Type

Type Details
CS Database Notation And Letter To Landowner/RP Contaminted soil is unde building. ADEC must be notified for appropriate actions if contaminated soil becomes accessible

Requirements

Description Details
When Contaminated Soil is Accessible, Remediation Should Occur contamianted soil under building. if buildign is removed ADEC must be contacted for appropriate actions

No associated sites were found.

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State of Alaska Department of Environmental Conservation

P.O. Box 111800
Juneau, AK 99811-1800
Phone: 907-465-5066
Fax: 907-465-5245
TDD: 800-770-8973
Physical Location: 410 Willoughby