Site Report: Hilcorp NS CIC Chemical Tank Storage, CTSA (BPX)
| Site Name: | Hilcorp NS CIC Chemical Tank Storage, CTSA (BPX) |
|---|---|
| Address: | Prudhoe Bay Unit, Eastern Operating Unit, Prudhoe Bay, AK 99734 |
| File Number: | 300.38.236 |
| Hazard ID: | 4143 |
| Status: | Cleanup Complete - Institutional Controls |
| Staff: | IC Unit, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 70.252528 |
| Longitude: | -148.357361 |
| Horizontal Datum: | WGS84 |
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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
The gravel pad had previously been used to store methanols and gycols in approximately 15-20 tanks up to 1,000 gallons. The tanks were supported by a wooden dock approximately 40 x 80 feet which has since been removed. Samples taken from the gravel pad in 2002 show concentrations of GRO up to 1,610 mg/kg and DRO up to 4,190 mg/kg in one sample. Pore water samples show concentrations of GRO up to 8.4 mg/L, DRO up to 9.29 mg/L, and Benzene up to 1.7 mg/L. The pore water contamination could be from the plume associated with the Crude Oil Topping Unit located upgradient. Soil samples do not indicate that contamination from the chemicals that were stored on-site have impacted the gravel pad. The Crude Oil Topping Unit (COTU) is located upgradient (north)of the site. DRO concentrations decrease traveling downgradient across the gravel pad footprint.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 4/3/2002 | Site Characterization Workplan Approved | Site Characterization Work Plan aoproval letter sent on this day. | Renee Evans |
| 5/9/2003 | Update or Other Action | Site Characterization Report received on this date. | Sarah Cunningham |
| 6/16/2005 | Site Added to Database | Gravel pad formally used as a storage area impacted by DRO, GRO, and benzene. | Sarah Cunningham |
| 3/20/2007 | Exposure Tracking Model Ranking | Bill O'Connell | |
| 4/3/2007 | Conditional Closure Approved | The Department of Environmental Conservation, Contaminated Sites Program, (ADEC) reviewed the environmental records associated with the BPX CIC Former Chemical Tank Storage Area (CTSA). The information presented to date indicates that the subject area was contaminated by the release of a hazardous substance; however, analytical sampling indicates the contamination does not pose an unacceptable risk to human health or the environment. Based on this information, ADEC has determined that the CTSA shall be conditionally closed | Bill O'Connell |
| 4/3/2007 | Institutional Control Record Established | The decision above will be noted as “Conditional Closure” on the ADEC database and is subject to the following conditions: 1. A Notice of Residual Contamination will be recorded on the ADEC database to document that there are areas on the pad where hazardous substance contamination may remain above the most stringent ADEC cleanup levels 2. Any proposal to transport soil or porewater off site requires ADEC approval in accordance with 18 AAC 75.325(i). This determination is based on information presented to date but does not preclude the Department from requiring additional assessment and/or cleanup action if future information indicates that this site may pose an unacceptable risk to human health or the environment. | Bill O'Connell |
| 6/12/2012 | Institutional Control Compliance Review | An IC review was conducted on this site and the staff assigned was changed from Bill O'Connell to IC Unit. | Evonne Reese |
| 12/4/2014 | Update or Other Action | Staff name changed from IC Unit to McLoone. | Evonne Reese |
| 9/28/2016 | Update or Other Action | At this time, the project manager chooses to retain management of this site which has institutional controls. | IC Unit |
| 3/3/2021 | Institutional Control Compliance Review | IC compliance review started. A Hilcorp sites combined verification letter to the RP will be issued in early 2021. | Evonne Reese |
| 8/5/2024 | Institutional Control Compliance Review | IC compliance review completed on this date. An IC reminder letter was issued to the landowner. The next review will be in five years’ time. | Gaige Robinson |
Contaminant Information
| Name | Level Description | Media | Comments |
|---|---|---|---|
| DRO | > Method 1 (Arctic only) | Soil | |
| GRO | > Method 1 (Arctic only) | Soil |
Control Type
| Type | Details |
|---|---|
| CS Database Notation And Letter To Landowner/RP |
Requirements
| Description | Details |
|---|---|
| Advance approval required to transport soil or groundwater off-site. |
No associated sites were found.