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Site Report: AT&T Alascom Duncan Canal Repeater


Site Name: AT&T Alascom Duncan Canal Repeater
Address: 9 Miles SW of Petersburg; Kupreanof Island, Petersburg, AK 99833
File Number: 1521.38.004
Hazard ID: 3281
Status: Active
Staff: Eileen Olson, 9072697527 eileen.olson@alaska.gov
Latitude: 56.755588
Longitude: -133.174177
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

Site Investigation revealed Lube Oil soil staining at the power building and within the diked fuel storage area. Latitude/Longitude provided by environmental consultant. Source Area ID# 75246. The 2009 Site Investigation of a 2007 diesel release from a leaking generator aboveground storage tank (AST) fuel line suggested 200 gallons were missing but closer examination of AT&T fuel invoices indicate that consumption of diesel supplies in 2007 are 2,000 gallons above the 2006 diesel supplies. Source Area ID# 78853 is attributed with fuel impacts to surface drainages extending beyond 1,000 feet linear distance down slope from the facility with oil sheen on soil and surface water exposed by defoliating grassland and small trees. Variability in the depth of contamination suggest that the leakage occurred in part during the predominant frozen ground conditions at the 2,500 foot elevation location on west Kupreanof Island.

Action Information

Action Date Action Description DEC Staff
8/31/2000 Voluntary Cleanup Program Application accepted. Bruce Wanstall
9/1/2000 Site Ranked Using the AHRM Initial ranking. Bruce Wanstall
9/18/2000 Site Added to Database Lube oil and DRO. Bruce Wanstall
1/15/2002 Site Closure Approved Site cleaned up to method 2 cleanup levels. Anne Marie Palmieri
9/11/2007 Update or Other Action This is the approximate period for annual maintenance during which AT&T Alascom employees observed fuel leaking from a supply line inside the generator building and took steps to halt the "pinhole leak". The rate of leakage did not result in stopping the engines from running or to trigger a leak detection sensor on the floor of the generator building. Test of the sensor determined that it was working properly. Excess oil was not observed inside the building or outside the building as stained soil. AT&T employees did not notify the ADEC or the USFS of the fuel release. Bruce Wanstall
8/29/2008 Site Reopened The department was contacted by an AT&T Alascom consultant to coordinate site visit to evaluate an estimated 200 hundred gallon diesel spill at the Duncan Canal Repeater Facility near Petersburg. The spill apparently occurred in 2007 and was reported to the ADEC by the USFS in August, 2008. PERP Southeast Alaska Response Team is the lead investigator for the case. Bruce Wanstall
9/22/2008 Potentially Responsible Party/State Interest Letter The Department notified AT&T Alascom of regulatory responsibility and liability for State Interest to investigate and clean up fuel oil contamination discovered by AT&T during a Fall 2007 annual maintenance visit to the Duncan Canal repeater facility. Bruce Wanstall
2/2/2010 Spill Transferred from Prevention Preparedness and Response Program Spill transferred by PERP staff Sarah Moore. Spill number = 07119930501; spill date = 9/7/07; substance = diesel; quantity reported as 200 gallons but fuel discrepancy compared to historic average is 2,000 gallons; PERP file number = 1521.02.028; source = cracked fuel line from generator above ground storage tank. Mitzi Read
2/17/2010 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 78853 name: Generator Fuel Line to AST - 2007 Diesel Release Mitzi Read
3/11/2010 Update or Other Action Shaw Environmental Inc will make a technical staff site visit to the Duncan Canal AT&T facility in March to gather information on conceptual site model data gaps agreed upon between Shaw and ADEC. Bruce Wanstall
6/29/2010 Report or Workplan Review - Other ADEC approved and commented on a soil and surface water sampling plan to fill site investigation data gaps for development of a cleanup plan at the Duncan Canal AT&T Alascom Telecommunications site near Petersburg. Bruce Wanstall
9/30/2010 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78853 Generator Fuel Line to AST - 2007 Diesel Release. Bruce Wanstall
11/17/2010 Report or Workplan Review - Other ADEC approved and commented on a 2010 Shaw Environmental Inc site assessment report on the AT&T Alascom Duncan Canal Repeater site. A generator fuel supply line failure traced back to 2007 resulted in loss of over 2,000gallons of diesel that went unrealized until 2008 when the US Forest Service discovered drainage channels leading from the site were contaminated with diesel. One of the runoff channels intersected a hazardous debris landfill associated with the Duncan Canal RRS site cleanup. The resulting responsible party dispute resolution now involves both technical and legal staff from AT&T Alascom (RP), US Air Force (RP), US Forest Service (Resource Manager) and ADEC (lead regulatory agency). A (USAF) proposed hazardous debris and contaminated soil removal action is expected to take place during the 2011 season to satisfy cleanup for both contaminated sites. Bruce Wanstall
4/21/2011 Update or Other Action AT&T letter proposes that contamination source areas on the US Forest Service lease property are sufficiently stable to delay physical removal from the on-site facility property until the planned large scale removal action proposed by the Air Force in 2012, AT&T proposes to focus on better characterization of the off-site drainage channels in 2011 and to assess current conditions of those areas previously sampled. AT&T continues to make progress in negotiations with the Air Force regarding the cleanup of co-mingled contaminated areas at the site. Bruce Wanstall
4/27/2011 Update or Other Action DEC has reviewed the April letter from AT&T that clearly conveys the intent to address cleanup responsibility for all contamination resulting from the 2007 petroleum release. The DEC recognizes efforts made by AT&T to negotiate with the Air Force for excavation removal of off-site areas of co-mingled contamination in natural drainage areas during the narrow seasonal window available at this site in 2012. The proposal by AT&T to further delay the cleanup of on-site source areas at the site into 2012 however is not acceptable. In reply the DEC respectfully disagrees with conclusions made in the letter and requests that AT&T submit a work plan for interim removal of source areas on the lease property and additional site investigation of the off-site drainages. Email copies sent to USDA FS and Air Force affiliates and to the respective AT&T and agency legal counsel. Bruce Wanstall
6/17/2011 Interim Removal Action Approved DEC reviewed and approved the Shaw Environmental interim removal workplan for the Duncan Canal site; the approval letter with comments was sent by email to Mark Smith at AT&T Services. Bruce Wanstall
7/12/2011 Update or Other Action Approval sent to Shaw Environmental and Infrastructure Group for proposed changes to the work plan as detailed below; namely that soil will now not be excavated and removed from the site in supersacks, but rather, that it will be treated in-situ by roto-tilling and applying Regenox to assist in breakdown of the hydrocarbons. Necessary measures will be taken by Shaw to prevent oxidized runoff from traveling offsite and from stressing or impacting vegetation. The least volume of Regenox necessary to treat the site will be used. Follow-up evaluation of this remediation strategy will take place by Shaw in August, with ample advance notice provided to ADEC and the USFS. Sally Schlichting
3/2/2012 Report or Workplan Review - Other DEC evaluated Results of Remediation and Additional Site Investigation Conducted in July and August 2011 at AT&T Repeater Site, dated November 2011 and received in our office on February 6, 2012. Shaw Environmental completed the report for AT&T documenting 2011 Site Activity. In accordance with Title 18 Alaska Administrative Code (AAC) 75.360, qualified person(s) used data collection and field screening methods consistent with DEC methodology in the approved site remediation and characterization work plan. The data qualifications meet field and laboratory report quality assurance criteria in Contaminated Sites Program guidance documents, therefore the Report is approved in accordance with 18 AAC 75.335(d). A DEC letter of approval was sent by regular mail to Mark Smith, PG with AT&T Services Inc. The letter was copied by electroic mail to the US Air Force, the the US Forest Service, Alaska Dept of Law and Tim O'Conner with Shaw who replaced Chris Generous as project manager. Bruce Wanstall
3/19/2012 Update or Other Action File SPAR Invoice 11752 for ~$485 dated April 2011 for FY11 site logs by Keather McKloone and Bruce Wanstall conducting administrative tasks that pertain to Contaminated Sites at AT&T Telecommuncation sites Statewide. Bruce Wanstall
12/21/2012 Report or Workplan Review - Other The DEC has reviewed the letter report titled: Results of Remediation and Additional Site Investigation Conducted in July and August 2012 at AT&T Repeater Site, Duncan Canal, Alaska (Report), dated October 29, 2012. Shaw Environmental submitted the Report for AT&T to document field activity in 2012 at the active telecommunications facility, the AT&T Alascom Duncan Canal Repeater contaminated site. DEC has tentatively approved the Report contingent upon submittal of required DEC quality assurance checklists for the three laboratory reports. Bruce Wanstall
2/11/2013 Report or Workplan Review - Other DEC reviewed and approved the QA/QC lab report evaluation and the letter/report titled: Revised Results of Remediation Conducted in July and August 2012 at AT&T Repeater Site (Report) dated January 31, 2013. Shaw Environmental Inc. submitted the Report for AT&T to document results of soil sampling and remedial activity in 2012 at the active telecommunications facility at Duncan Canal near Petersburg, Alaska. The objective of Shaw field activities in July and August 2012 was to collect laboratory samples then mix chemicals into contaminated soil with a roto-tiller in four areas at the site based on Interim Source Removal and Additional Site Investigation Work Plan approved by the DEC in July, 2011. Bruce Wanstall
7/31/2013 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78853 Generator Fuel Line to AST - 2007 Diesel Release. In-situ soil treatment by AT&T over two summer seasons has reduced DRO/RRO in soil to levels below the 8,250 mg/kg ingestion direct contact criteria under the generator building source area and in the surface drainage path north down to the cat road. DRO/RRO levels remain above the 8,250 mg/kg level in the Northwest surface drainage above and below the cat road where petroleum co-mingled with USAF landfill hazardous waste debris. Bruce Wanstall
8/1/2013 Report or Workplan Review - Other DEC reviewed the URS 2013 Soil Assessment and Excavation Work Plan and replied with approval/comment to AT&T/URS by electronic mail copied to the USFS. URS will use a Duncan Canal barge loading site for the contaminated soil removal action in fall 2013 rather than the Tonka Mountain LTF. URS will field screen to select locations for confirmation laboratory sampling using Sitelab UVF-3100 technology for diesel in the range of 8,250 mg/kg levels. If debris removal to the extent feasible below the cat road in the north drainage is negotiated with the USFS, DEC has no objection to adding it to the work plan. The 2012 Sampling and Remediation Report by Shaw and the DEC Report approval letter support additional sampling in all areas at the Telecom site. Bruce Wanstall
11/27/2013 Offsite Soil or Groundwater Disposal Approved In accordance with the Approved Work Plan (URS, August 8, 2013) DEC reviewed soil data and sent signed approval by email for the off-site transport of an estimated volume of 50 cubic yards of petroleum contaminated soil for remediation. The soil was excavated from the Duncan Canal AT&T Telecom site near Petersburg in 2013 by URS and the destination is the Columbia Ridge Landfill in Arlington OR. Bruce Wanstall
3/20/2014 Report or Workplan Review - Other DEC sent an approval and comment letter by regular and electronic mail regarding AT&T Duncan Canal Repeater Impacted Soils Excavation Report (Report), dated February, 2014. URS Corporation (URS) completed the Report for AT&T Services Inc. (AT&T) documenting the contaminated soil removal actions, field screen sampling and analytical confirmation sampling of surface soil at the referenced Site. Review of the Report found that the number of representative samples collected is acceptable and the precision, accuracy and completeness of the resulting analytical data is sufficient to be used to support the decision making process. In accordance with Title 18 Alaska Administrative Code (AAC) 75.360, qualified person(s) used data collection and field screening methods consistent with DEC methodology in the approved soil assessment and excavation work plan. The DEC laboratory report checklist submitted as an attachment is acceptable and the data meet field and laboratory report quality assurance criteria in Contaminated Sites Program guidance documents, therefore the Report is approved in accordance with 18 AAC 75.335(d). Bruce Wanstall
3/20/2014 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78853 Generator Fuel Line to AST - 2007 Diesel Release. Bruce Wanstall
7/28/2015 Update or Other Action Evaluate the site record and discuss the Bhate removal action at the Duncan Canal site with the CS project manager for the USAF landfill debris site. Left telephone message with Titan for AT&T that the expected outcome of the planned work in Area 3 was not accomplished and additional work next season is necessary. Bruce Wanstall
7/25/2016 Update or Other Action Inquire with AT&T/Titan Engineering and find that a USAF removal action at DA001 and below the cat road is not planned in 2016 due to funding issues. Bruce Wanstall
8/19/2016 Report or Workplan Review - Other DEC has reviewed and approved by letter Work Plan – 2016 Site Inspection and Soil Sampling Plan, Duncan Canal Repeater Station, (Work Plan) dated August 18, 2016. The Work Plan outlines proposed plans by AT&T Services, Inc. /Alascom (AT&T) to conduct an inspection of the Duncan Canal Repeater Station site for environmental purposes, and collect several soil samples at select locations for laboratory analyses. The proposed soil sampling locations will be focused where previously-collected samples in drainages exhibited diesel (DRO) and residual (RRO) range hydrocarbon concentrations that exceeded DEC cleanup standards. Bruce Wanstall
9/21/2016 Update or Other Action AT&T’s environmental site inspection and limited soil sampling exercise to be conducted at the Duncan Canal site in accordance with the recently-approved work plan has been scheduled for today. A report will be prepared and a copy submitted to DEC with results of the inspection and sampling. Bruce Wanstall
10/10/2017 Update or Other Action Staff assigned changed from Sally Schlichting to Eileen Olson. Kathryne Roldan

Contaminant Information

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Control Type

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