| Action Date |
Action |
Description |
DEC Staff |
| 10/24/1972 |
Interim Removal Action Approved |
(Old R:Base Action Code = SC - Site Control (Emergency Response)). Army removed approximately 1500 gallons of fuel as well as 26 barrels of fuel/ice mixture. Military reported a fuel loss of 130 barrels and according to report, half recovered. |
Former Staff |
| 10/24/1972 |
Update or Other Action |
(Old R:Base Action Code = FI - Field Inspection (General)). Hok and Lowery made several inspections of the fuel spill site and noted that collection sumps had been dug south of the pipeline towards the creek. Water samples from the creek contains 1:1 mixture of fuel and water. Noted heavy fuel odor along creek. 2-6 inches of pure fuel trapped beneath ice in first 1/4 mile of the creek. |
Doug Lowery |
| 9/20/1991 |
Site Added to Database |
Pipeline fuel spill. |
Former Staff |
| 3/2/2001 |
Update or Other Action |
File number updated from 140.02.029 to 140.38.037. |
Mitzi Read |
| 7/17/2007 |
Site Characterization Workplan Approved |
Workplan approved this date. |
Anne Marie Palmieri |
| 4/29/2008 |
Site Characterization Workplan Approved |
USACE ROST workplan approved this date. |
Anne Marie Palmieri |
| 6/12/2008 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed. |
Anne Marie Palmieri |
| 9/4/2008 |
Site Characterization Report Approved |
Report of 2007 fieldwork approved this date. 20 cy of petroleum contaminated soil removed and sent to OIT for disposal. DRO concentration of 1600 mg/kg on the floor of the excavation. Additional investigation needed. |
Anne Marie Palmieri |
| 9/29/2010 |
CERCLA SI |
2008 ROST SI approved this date. 9 probes were installed and no soil samples were collected. Petroleum-contaminated soil was not found during this investigation as the area of known contamination could not be investigated due to wet and muddy soil conditions. Additional investigation will occur in 2010-11. |
Anne Marie Palmieri |
| 2/4/2013 |
Update or Other Action |
project manager changed from Palmieri to Morris. |
Anne Marie Palmieri |
| 12/17/2015 |
Update or Other Action |
Staff changed to Danielle Duncan and hard file transferred to the Juneau office. |
Kristin Thompson |
| 2/22/2016 |
Update or Other Action |
Rec'd email notification that the military is working on a scope of work for additional investigation at the site. They are in the process of obtaining a right-of-entry for 2016-2021. We have plans for a teleconference to discuss this week. |
Danielle Duncan |
| 2/23/2016 |
Meeting or Teleconference Held |
Had a teleconference with the military to discuss the scope of work for the project. Pending the military paperwork and a contract, we plan on doing a site visit and SI this spring (April/May). The SI will involve determining the trajectory of the spill and possibly doing some drill rig work where the spill occurred. Downslope of the spill is very overgrown and test pitting may be more suitable rather than a drill rig. It is suspected that the spill went to the Tanana River following drainages to its destination. There may also be some co-located sediment and water samples collected. If groundwater is encountered, there will be a maximum of 5 groundwater monitoring wells installed. There may be intermittent permafrost and/or perched groundwater. |
Danielle Duncan |
| 4/20/2016 |
Update or Other Action |
Potentially will have a work plan this fall and a site visit this summer. RP received right of entry to conduct work. |
Danielle Duncan |
| 7/26/2016 |
Document, Report, or Work plan Review - other |
Rec'd draft work plan this date by electronic mail. |
Danielle Duncan |
| 8/2/2016 |
Site Visit |
Joint site visit by ADEC, DNR, USACE, and FES. We looked along the pipeline corridor, adjacent drainage, and creek for evidence of the spill back in 1972. Further investigation involving test pitting is planned. There has been active mining potentially on and near the site that may have disrupted stream and drainage flow. Additionally, the highway, drainages, and stream have likely moved since the spill happened. Upcoming investigation will hopefully shed some light on the issue. No obvious signs of contamination were observed. |
Danielle Duncan |
| 8/9/2016 |
Document, Report, or Work plan Review - other |
Sent comments and letter for the draft work plan. The current scope of work is to investigate the suspected release area, intermittent drainage, and the Tenderfoot Creek drainage. Within the release area, a total of 15 borings using Direct Push Technology will be drilled and sampled at a maximum depth of 20 feet. A PID will be used to field screen soils and a minimum of one soil sample per boring (having the highest PID results) will be submitted for laboratory analysis. In addition, if groundwater is encountered, a soil sample will be collected from the groundwater interface and a maximum of four soil borings will be completed as temporary monitoring wells. Figures were provided depicting the proposed locations of borings although these may change depending on site conditions. |
Danielle Duncan |
| 8/15/2016 |
Document, Report, or Work plan Review - other |
Accepted responses to my comments and sent via email this date. Should have a finalized work plan soon. |
Danielle Duncan |
| 8/25/2016 |
Update or Other Action |
Approved the final work plan this date. Work on site will likely begin Monday. |
Danielle Duncan |
| 12/8/2016 |
Meeting or Teleconference Held |
The RP plans to treat the source area as a separate decision unit from the drainage. This will enable us to move forward with a remedial design for the source area. The draft Tenderfoot and Timber investigation reports should be sent within 2 weeks. |
Danielle Duncan |
| 1/23/2017 |
Update or Other Action |
RP is sending a hardcopy with CD for the Tenderfoot Creek draft report to avoid issues with FTP. |
Danielle Duncan |
| 1/23/2017 |
Update or Other Action |
Emailed the RP answering the question whether human health cleanup levels can be used to due permafrost - no - the permafrost is discontinuous - have the work done mid-summer to avoid frozen soils. The migration to groundwater cleanup levels apply to the site. |
Danielle Duncan |
| 1/30/2017 |
Update or Other Action |
Provided comments on the draft SI report. The site is underlain by permafrost at varying depths. There was permafrost encountered in August. |
Danielle Duncan |
| 4/4/2017 |
Site Characterization Report Approved |
Approved the site characterization report this date. The release area is free of contamination exceeding human health cleanup levels and the ADEC concurs with the recommendation of no further action for this area. Tenderfoot Creek had no contaminants exceeding SQuiRT screening levels and the ADEC concurs that no further action is needed in this area. The only area of requiring further action is the intermittent drainage where ADEC human health cleanup levels, SQuiRTs screening levels, and AWQS are exceeded. The site appears to be underlain by permafrost at approximately 3-6 feet below ground surface which may prevent migration of contamination to groundwater. Additionally, groundwater has never been encountered during this or previous investigations. For these reasons, the approved cleanup levels for the site are the Method 2 Ingestion and Human Health Cleanup Levels for the under-40 inch precipitation zone as outlined in 18 AAC 75.340 Tables B1 and B2. |
Danielle Duncan |
| 7/19/2017 |
Site Characterization Workplan Approved |
Approved the Final Work Plan Addendum Additional Investigation of the Intermittent Drainage work plan this date. Phase 1: The entire length of the drainage will be sampled in 10 foot intervals using a hand driven probe or a bucket auger and field screened using a photoionization detector (PID). From these field screening samples, 30 laboratory samples will be collected from the samples having elevated PID results. Phase 2: Test pit excavations will be made using a small track excavator and up to 20 tons of petroleum contaminated soil may be excavated. |
Danielle Duncan |
| 3/29/2018 |
Document, Report, or Work plan Review - other |
Provided comments on the Draft Tenderfoot Creek 2017 Investigation Report this date. |
Danielle Duncan |
| 3/29/2018 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 70992 spill location. |
Danielle Duncan |
| 5/14/2018 |
Site Characterization Report Approved |
Approved the Final Report 2017 Environmental Investigation Tenderfoot Creek (Pipeline Milepost 555) dated April 2018. The extent of petroleum contamination was further delineated and a small amount of contaminated soil was excavated and disposed of. |
Danielle Duncan |
| 10/10/2018 |
Update or Other Action |
Sent a letter today retracting the cleanup levels from human health to migration to groundwater after consultation with management. |
Danielle Duncan |
| 9/16/2021 |
Site Visit |
Conducted a site visit with DNR and USACE FUDS personnel. The area is a drainage with wetlands around it. |
Lisa Krebs-Barsis |
| 3/1/2023 |
Document, Report, or Work plan Review - other |
USACE CRREL and FUDS personnel conducted a permafrost evaluation of the site in September 2021. Four transects crossed the site, in the upper and lower drainage areas. Within the drainage permafrost was observed at a maximum depth of 5 feet below ground surface. Outside of the drainage the permafrost was observed at a maximum depth of 1.31 feet below ground surface. |
Lisa Krebs-Barsis |
| 9/19/2023 |
Site Characterization Workplan Approved |
Comments sent on the Draft 2023 Additional Investigation Work Plan. A work plan was submitted proposing two small excavations around areas of previous MAC exceedances for DRO at SS13 and SS37. Soil will be excavated and confirmation samples collected. Surface water samples will be collected before soil disturbance. Up to 8 TOC samples will be collected from 4 borings. |
Lisa Krebs-Barsis |
