| Action Date |
Action |
Description |
DEC Staff |
| 4/7/2015 |
Potentially Responsible Party/State Interest Letter |
Potentially Responsible Party / State Interest Letter sent to North Slope Borough by PPRP staff Paul Lhotka. |
Mitzi Read |
| 5/3/2016 |
Spill Transferred from Prevention Preparedness and Response Program |
Spill transferred by PPRP staff Paul Lhotka. Spill no. 15399908701; spill date = 3/28/15; substance = diesel; quantity = ~100 gallons; PPRP file no. 310.02.018. |
Mitzi Read |
| 5/5/2016 |
Site Added to Database |
A new site has been added to the database |
Mitzi Read |
| 5/26/2016 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 79913 name: NSB Barrow Public Works Shop II |
Mitzi Read |
| 6/20/2016 |
Document, Report, or Work plan Review - other |
Reviewed the Final Assessment Report, dated May 21, 2015. Activities mainly consisted of excavating impacted snow and soil to a maximum depth of 2.5 feet bgs. An estimated 87 cubic yards of impacted soil was removed and stockpiled onsite. Impacted snowmelt was disposed of in the Barrow treatment lagoon. Confirmation samples collected from the base and sidewalls of the excavation revealed that levels of DRO remain in the excavation up to 9,420 mg/kg. |
Joshua Barsis |
| 6/22/2016 |
Document, Report, or Work plan Review - other |
Reviewed the Additional Site Characterization Draft Report, dated October 30, 2015 for the NSB Barrow Public Works Shop II site. The report describes additional excavation and characterization activities completed in August and September 2015 in order to address remaining contamination left in place after the initial excavation. Roughly 405 cubic yards of impacted soil was removed from this site, along with 4,580 gallons of potentially-contaminated water that was recovered from the base of the excavation pit.
Analytical soil samples were collected from the base and sidewalls of the excavation, and also from five test pits that were advanced in an effort to delineate the remaining contamination. Results revealed that DRO and RRO remain above the cleanup levels in the excavation and test pits up to 4,920 mg/k and 5,550 mg/kg, respectively.
The potentially-contaminated water was treated using a GAC filter and was discharged to the soils of the site. The excavated soil has not yet been disposed of or treated and remains onsite.
Recommendations outlined in the report include further delineation of the vertical and horizontal extent of contamination, and further excavation of impacted soil. ADEC responded to this report via letter dated June 22, 2016. Work plan requested by August 1, 2016.
|
Joshua Barsis |
| 8/25/2016 |
Document, Report, or Work plan Review - other |
Reviewed the document entitled Additional Site Characterization Work Plan-Further Characterization and Removal of Contaminated Soil, dated August 23, 2016 for the NSB Barrow Public Works Shop II site. Proposed activities mainly consist of advancing ten soil borings, three of which will be completed as monitoring wells, and collected soil and water samples as appropriate. |
Joshua Barsis |
| 1/17/2017 |
Update or Other Action |
Letter sent to NSB on this day detailing the current status/progress of 22 active contaminated sites, including this site. |
Joshua Barsis |
| 11/20/2017 |
Update or Other Action |
Letter sent on this day as a follow up to the last version of this letter, dated January 17, 2017, and as a follow up to a meeting with NSB on November 17, 2017. This letter details the current status/progress of 23 active contaminated sites, including this site. |
Joshua Barsis |
| 8/22/2018 |
Update or Other Action |
Sent a letter on this day to outline the history of this site and the current data gaps that are preventing this site from closure. Requested that the August 2016 approved work plan be implemented during the 2019 field season. |
Joshua Barsis |
| 11/16/2018 |
Update or Other Action |
Letter sent on this day as a follow up to the last version of this letter, dated November 20, 2017, and at the request of the North Slope Borough (NSB). This letter details the current progress of 24 active contaminated sites, including this site. |
Joshua Barsis |
| 12/13/2019 |
Enforcement Action |
Compliance letter sent on this day with site summary and identification of data gaps:
A spill report was received on March 31, 2015 indicating that a tank truck operator had overfilled a piece of equipment that was located at the North Slope Borough Barrow Shop II pad. An estimated 100 gallons of ultra-low sulfur diesel fuel was spilled onto compacted snow over a gravel surface. Initial response actions included applying absorbent materials and scraping up contaminated snow and soil with heavy equipment. An estimated 87 cubic yards of impacted soil was removed and stockpiled onsite. Impacted snowmelt was disposed of in the Barrow treatment lagoon. Confirmation samples collected from the base and sidewalls of the excavation revealed that levels of Diesel Range Organics (DRO) remain in the excavation up to 9,420 mg/kg. The initial impacted area was reported to be 6 yards, however the contaminated snow and soil that was stockpiled during the response was not placed on a liner, ended up contaminating an additional area not impacted by the initial spill.
Additional excavation and characterization were completed in August and September 2015 in order to address remaining contamination left in place after the initial excavation. Roughly 405 cubic yards of impacted soil was removed from this site, along with 4,580 gallons of potentially-contaminated water that was recovered from the base of the excavation pit. Analytical soil samples were collected from the base and sidewalls of the excavation, and also from five test pits that were advanced in an effort to delineate the remaining contamination. Results revealed that DRO and Residual Range Organics (RRO) remain above the cleanup levels in the excavation and test pits up to 4,920 mg/k and 5,550 mg/kg, respectively. The potentially-contaminated water was treated using a GAC filter and was discharged to the soils of the site. The excavated soil has not yet been disposed of or treated and remains onsite.
A work plan was prepared in August 2016 to further delineate the vertical and horizontal extent of contamination with soil borings and monitoring wells. This plan was approved by ADEC on August 25, 2016, but was not completed.
During the last meeting between ADEC and NSB on January 17, 2017, it was agreed that this effort would be completed during the 2018 field season. To date, ADEC has not received notification that the field effort was completed, or that it is still planned.
Data Gaps: (1) The extent of contamination has not been sufficiently delineated; (2) The onsite stockpile of contaminated soil needs to be treated or disposed of.
|
Joshua Barsis |
| 2/19/2020 |
Enforcement Action |
Notice of Violation issued to NSB on February 18, 2020. See file for more information. |
Joshua Barsis |
| 6/29/2022 |
Enforcement Agreement or Order |
A compliance order by consent (COBC) was signed by the North Slope Borough and ADEC Division of SPAR. The COBC identifies corrective actions that the NSB will take to manage cleanup waste and characterize and remediate contaminated sites and spills. |
Lisa Krebs-Barsis |
| 9/13/2023 |
Site Visit |
DEC personnel (Krebs-Barsis, Joyce) conducted a site visit of Shop II for compliance with the COBC, the visit also looked at the Warm Storage and Shop III. The Public Works Shop II source area is adjacent to Stevenson Street and is used as a parking area. |
Lisa Krebs-Barsis |
| 3/6/2024 |
Site Characterization Workplan Approved |
NSB requested in an email on February 23, 2024, to use the previously approved 2016 Work Plan for site characterization. Reviewed the document entitled Additional Site Characterization Work Plan-Further Characterization and Removal of Contaminated Soil, dated August 23, 2016 for the NSB Barrow Public Works Shop II site. Proposed activities mainly consist of advancing ten soil borings, three of which will be completed as monitoring wells, and collecting soil and water samples as appropriate. Requested that NSB complete one additional boring as a monitoring well and acknowledge the comments in the original DEC approval letter sent August 26, 2016. Site characterization work is scheduled for Summer 2024. |
Andrea Carlson |
