| Action Date |
Action |
Description |
DEC Staff |
| 6/9/2006 |
Site Added to Database |
Suspected hydrocarbon and potential metals contamination. |
Bill Petrik |
| 6/12/2006 |
GIS Position Updated |
Used TopoZone Pro in conjunction with Figures 1, 2, and 3 and Appendix A of the Oasis Environmental "2006 Work Plan, Hurl State Phase II Site Assessment, Prudhoe Bay Unit" dated 4/10/06 and BP Exploration (Alaska) Inc. maps "Aerial Photo Mosaic, Colville to Canning River, July 1998, Prepared by AeroMap U.S., Anchorage AK" and "Kogru to Canning, October 2000". Used a 1:24,000 Scale USGS Topo Base Map, Large Map Size, at 1:24,000 Scale. High degree of confidence in the accuracy of the coordinates. Suggest taking GPS reading to improve accuracy. |
Bill Petrik |
| 6/12/2006 |
Site Ranked Using the AHRM |
Initial ranking. Too many unknowns will not allow a score to be calculated. |
Bill Petrik |
| 6/12/2006 |
Update or Other Action |
File number issued 300.38.250. |
Aggie Blandford |
| 6/13/2006 |
Site Characterization Workplan Approved |
Previous investigations found sheening on tundra ponds adjacent the pad. Soil-gas suvey indicated potential contamination on approximately 1/3 of the pad. Workplan states 31 boreholes will be advanced on the gravel pad. Samples will be analyzed for DRO/RRO with 20% of the samplesd also analyzed for GRO/BTEX |
Bill O'Connell |
| 7/27/2006 |
Update or Other Action |
Site visit conducted on this date with Oasis. Light sheen observed adjacent to pad when disturbed with shovel. Possible flare-pit contamination as well. Additional details will be added to DB when sampling report is finalized. |
Bill O'Connell |
| 1/16/2007 |
Meeting or Teleconference Held |
Meeting with BPXA, ADEC CS and SW programs to provide comments to BPXA on the Hurl St. Phase II report and CAP. ADEC requested additional details on field screening and sample collection methods and requested that BPXA contact ADEC for approval to use excavated gravel as reserve pit backfill following stockpile sampling. ADEC also requested BPXA submit and updated CSM for the site to be included with the addendum. BPXA agreed to address comments in an addendum to be submitted for approval. |
Bill O'Connell |
| 1/19/2007 |
Update or Other Action |
QA/QC review of data packages submitted with Phase II/CAP Report completed. Data was found useable with no outstanding errors or discrepancies |
Bill O'Connell |
| 1/25/2007 |
Update or Other Action |
Corrective Action Plan plus addendum approved. Original report recieved 11/26/06. Following a meeting with ADEC on 1/16/07, BPXA submitted an addendum to the Phase II Site Assessment Report and CAP to address ADEC comments. ADEC requested additional details on field screening, characterization, and confirmation sample collection methods and frequency and requested that BPXA contact ADEC SW program with the results from stockpile sampling prior to using stockpiled material to backfill the reserve pit. The addendum also contained an expanded Conceptual Site Model with gracphic and discussion of potential exposure pathways and receptors at the site. |
Bill O'Connell |
| 3/21/2007 |
Exposure Tracking Model Ranking |
|
Bill O'Connell |
| 10/19/2007 |
Site Characterization Report Approved |
Received corrective action report. Over 100,000 cy of clean gravel from the former gravel pad, runway, and Kuparuk River access road were removed and transported to Z Pad for pad construction. Approximately 4,400 cy of conditional use gravel were used as backfill at the site and over 18,000 cy of restricted use and contaminated gravel were removed and transported to East Dock for landfarming. Gravel Pad/Tundra confirmation samples detected DRO up to 422 mg/kg. BTEX and the PAH naphthalene were detected, but at concentrations below ADEC cleanup levels. Several areas of hydrocarbon-impacted tundra were removed. |
Bill O'Connell |
| 3/12/2008 |
Institutional Control Record Established |
There is contamination remaining above established cleanup levels at Hurl State 5-10-13 but ADEC has determined there is no unacceptable risk to human health or the environment, and this site will be conditionally closed.
This decision is subject to the following conditions:
1. A Notice of Environmental Contamination will be recorded on the ADEC database to document that there is residual contamination remaining on site above the most stringent ADEC cleanup levels;
2. Any proposal to transport soil or groundwater off site requires ADEC approval in accordance with 18 AAC 75.370 (b)
|
Bill O'Connell |
| 3/12/2008 |
Conditional Closure Approved |
The Alaska Department of Environmental Conservation, Contaminated Sites Program (ADEC) reviewed the environmental records associated with exploration site Hurl State 5-10-13. This site had been contaminated by the release of a hazardous substance; however, based on the information provided to date, ADEC has determined that no further remedial action is required, and that Hurl State 5-10-13 can be closed subject to the conditions outlined in the Record of Decision. The hazardous substance contamination has been adequately addressed and does not pose an unacceptable risk to human health or the environment. |
Bill O'Connell |
| 5/15/2009 |
Update or Other Action |
In September 2008, follow up soil sampling was conducted along two thermokarst troughs at the location of the former gravel pad where hydrocarbon sheen was noted earlier in 2008. Fourteen soil samples were collected from shallow test pits along the areas of surface water where sheen was present.DRO was detected above the MRL in every sample with a maximum concentration of 258 mg/kg. Samples from two locations contained DRO above 200 mg/kg. |
Bill O'Connell |
| 9/10/2009 |
Site Visit |
Site visit on 9/1/09. Sheen was present in thermokarst troughs where it had been observed on previous site visits. |
Bill O'Connell |
| 3/19/2024 |
Institutional Control Update |
DNR-SAIL added as affiliate (Office of Primary Responsibility). For DNR LAS information: ADL# 420717 |
Jennifer McGrath |
