| Action Date |
Action |
Description |
DEC Staff |
| 6/14/2013 |
Update or Other Action |
Date of receipt of documentation from NSB regarding contamination found during design phase geotechnical work. Soil samples collected from five geotechnical boreholes in the proposed footprint of the new WWTP contained DRO up to 802 mg/kg with silica gel cleanup and the only result above Method One. Samples were analyzed for DRO, RRO, and BTEX. Four borings were advanced to 7-8 ft bgs and a fifth to 30 ft bgs and one of the shallow borings did not have a sample collected as contamination was not anticipated and sampling materials were not yet on hand. Contamination may be associated with two 5,000-gallon AST's and a dispenser formerly located nearby. |
Keather McLoone |
| 6/20/2013 |
Site Added to Database |
A new site has been added to the database |
Mitzi Read |
| 8/19/2013 |
Document, Report, or Work plan Review - other |
Date of receipt of workplan to remove soil and collect confirmation samples. Construction of the new treatment plant is schedule for 2014. Work planned for 2013 includes some excavation in the area of known contamination in the NE of the proposed footprint. Document also states that work done in 2014 will include the aread further north to include the previous AST impoundment and pump house areas. Excavation will be limited in effort to preserve the permafrost. |
Bill O'Connell |
| 8/19/2013 |
Document, Report, or Work plan Review - other |
Reviewed NSB SA-10 New Water and Wastewater Treatment Plant Pad work plan. The work plan addresses the removal of petroleum contaminated soil encountered in geotechnical sampling in the area of two former 5,000 gallon AST’s and associated dispenser. Petroleum contamination in soil is located in an area planned for the foundation of the new WWTP. Gravel pad soil will be excavated to a depth of 4 feet below ground surface, potentially contaminated soil deeper than this will be left in place so as not to disturb the underlying permafrost. Confirmation soil samples will be collected from the bottom and sides of the excavation. The stockpiled soil will be sampled and soil with DRO greater than 500 mg/kg will be treated or disposed of, soil with DRO less than 500 mg/kg will be proposed for reuse. |
Bill O'Connell |
| 9/3/2013 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 79482 name: Water and Wastewater Treatment Plant |
Bill O'Connell |
| 9/18/2013 |
Potentially Responsible Party/State Interest Letter |
|
Keather McLoone |
| 10/2/2013 |
Offsite Soil or Groundwater Disposal Approved |
1,800 cy of soil from NE corner excavation approved for transport to Oxbow Landfill |
Bill O'Connell |
| 5/14/2014 |
Site Characterization Workplan Approved |
Reviewed Work Plan for sampling at the NSB SA-10 New Water and Wastewater Treatment Plan. This work plan addresses contamination at two former 10,000-gallon ASTs, piping, and an associated dispenser. Because this fueling system has been demolished and the locations are not known with certainty, a 10’ x 10’ grid will be established over the former location of the equipment and soil samples will be collected for field screening from 64 locations at 6 inches below ground surface. The 10 samples with the highest PID readings will be submitted for laboratory analysis for DRO and RRO. Approximately 100 feet of buried pipeline remains and this area will be characterized in 10 foot increments as the piping is removed with 6 samples submitted for laboratory analysis for DRO and RRO. |
Bill O'Connell |
| 6/25/2014 |
Document, Report, or Work plan Review - other |
Reviewed AST Screening Tech Memo. This document provides the results of soil sampling in the vicinity of the two former 10,000-gallon ASTs and dispenser. 64 samples were collected for field screening from 0.5 - 1.0 feet bgs and the 10 samples with the highest PID readings were submitted for laboratory analysis. Contaminants were not detected above cleanup levels in any sample. The buried piping remains and will be evaluated under a separate project. |
Bill O'Connell |
| 7/10/2014 |
Document, Report, or Work plan Review - other |
Reviewed June 2014 Borehole Installation and Sampling Report. Eight large diameter boreholes were advanced for the purpose of installing pilings to support an overhead canopy north of the WWTP. 16 soil samples collected at depths ranging from 3 to 35 feet bgs were submitted for laboratory analysis of DRO and RRO with a subset of samples also analyzed for GRO and BTEX. DRO was detected up to a maximum concentration of 437 mg/kg at 35 feet bgs in borehole BH04. The source of petroleum contamination at this depth is unknown. GRO was detected up to 140 mg/kg in this same sample. Benzene was detected up to 2.33 mg/kg in BH04 at the 26 foot interval. Installation of the boreholes produced 15 cy of drill cutting which were approved for disposal at the Oxbow Landfill |
Bill O'Connell |
| 3/5/2015 |
Document, Report, or Work plan Review - other |
Reviewed August 2014 Borehole Installation Sampling Results, permission to haul, and surface water sampling report. Petroleum contamination was noted at depths between 18 and 24 feet bgs during the installation of boreholes to support pilings for an overhead canopy east of the new WWTP. Approximately 6 cy of cuttings were segregated based on field screening results and samples of the stockpiled cuttings contained DRO up to 5,100 mg/kg. Soil was approved for disposal at the Oxbow Landfill. The source of contamination at these depths is unknown, the gravel pad is approximately 5 feet think in this area. Surface water samples collected along the northern edge of the pad contained DRO up to 2.39 mg/l. Sheen was not noted on surface water during shovel sheen testing of the same drainage. |
Bill O'Connell |
| 3/19/2015 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 79482 Water and Wastewater Treatment Plant . |
Bill O'Connell |
| 4/10/2015 |
Update or Other Action |
Email sent to NSB SA 10 to request investigation of the fuel piping from the former ASTs to the existing WWTP and further evaluation of surface waster in the ditch where DRO was detected at 2.39 mg/l. |
Bill O'Connell |
| 1/18/2017 |
Update or Other Action |
Letter sent to NSB on this day detailing the current status/progress of 22 active contaminated sites, including this site |
Bill O'Connell |
| 4/4/2017 |
Document, Report, or Work plan Review - other |
Reviewed Phase II work Plan for NSB Former wastewater treatment plant (WWTP) in Deadhorse. Phase II activities will include the investigation of recognized environmental conditions (RECs) at the former WWTP and investigation of a former fuel pipeline at the new WWTP. RECs planned for investigation include areas of contamination at the former WWTP documented in previous reports, the location of two former above ground fuel storage tanks near the new WWTP to the south, damage to the concrete slab that may have allowed for the release of contaminants to the subsurface, and an area of accumulated incinerator ash. Additional activities pertinent to the new WWTP specifically include the investigation of a former tank farm that was not fully assessed during construction of the new WWTP, the underground pipeline connecting the former tank farm to the former WWTP, and an area along the northern edge of the pad where DRO was detected in a surface water sample in 2014. Soil boring s will be placed at the former tank farm, along the length of the former pipeline, and along the northern edge of the pad where DRO was detected in surface water. Expedited field screening will be conducted once the cores have thawed and at least one lab sample will be collected form each borehole. Soil samples will be analyzed for DRO, RRO, GRO, VOCs and PAHs. |
Bill O'Connell |
| 6/14/2017 |
Document, Report, or Work plan Review - other |
Reviewed Phase II Site Assessment for former NSB WWTP. The objective of the Phase II was to evaluate the recognized environmental conditions documented in a Phase I report at the former WWTP, specifically areas of petroleum contamination at the southwest corner of the property and former incinerating and tipping areas, the location of former ASTs near the new WWTP, areas of damage to the concrete slab, and accumulated incinerator ash that had collected in the interior of the building. Additional investigation was conducted in the former tank farm area that was not covered by the new WWTP, along an underground pipeline from the former tank farm to the former WWTP, and along the northern edge of the pad where DRO was detected in surface water. These last three areas are specific to the New WWTP. Ten boreholes were advanced into the underlying tundra and sampled to document the presence of contamination at the new WWTP site and 20 borings were advanced and sampled a the former WWTP. Soil borings in the footprint of the former tank farm included SB20 and SB21. Samples from these borings contained DRO up to 444 mg/kg, GRO up to 884 mg/kg,1,2,4-trimethylbenzene up to 50.7 mg/kg and xylenes up to 95 mg/kg. SB19 and SB15 were placed along the pipeline and contained DRO up to 2,310 mg/kg and GRO up to 287 mg/kg suggesting releases from the pipeline may have impacted soil in the area. Other borings on the new WWTP site included SB23-27. DRO was detected in samples from these borings up to 717 mg/kg. Contaminants were also detected on the former WWTP site, which will be entered into the CS database as a separate site. In general, the Phase II identified an area of diesel contamination in soil that spans both properties, with gasoline contamination also identified in separate areas on each property. Surface water sampling required at the new WWTP site based on previous results was not conducted as part of this investigation but is planned for 2017. |
Bill O'Connell |
| 6/22/2017 |
Document, Report, or Work plan Review - other |
Reviewed NSB New WWTP Drainage Ditch Surface Water Characterization Work Plan. Four surface water samples will be collected and analyzed for GRO, DRO, BTEX, and PAHs. Shovel sheen testing will be conducted at 20-foot intervals or areas of visible impact along the length of the ditches to the north and west of the lease tract. |
Bill O'Connell |
| 8/7/2017 |
Document, Report, or Work plan Review - other |
Reviewed addendum to Phase II Site Assessment for NSB New WWTP. The addendum provides information on dioxin concentrations in soil and fly ash samples that were evaluated using the World Health Organization Toxicity Equivalency Quotient (TEQ) approach. Dioxins were not detected in soil above the DEC cleanup level in any samples. |
Bill O'Connell |
| 2/19/2020 |
Enforcement Action |
Notice of Violation issued to NSB on February 18, 2020. See file for more information. |
Joshua Barsis |
