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Site Report: ConocoPhillips Gwydyr Bay 2/2A

Site Name: ConocoPhillips Gwydyr Bay 2/2A
Address: ~16 Miles NW of Deadhorse, Deadhorse, AK 99734
File Number: 300.38.316
Hazard ID: 26368
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 70.408555
Longitude: -148.753091
Horizontal Datum:WGS84

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

Phase II Site Assessment results include gasoline range organics and diesel range organics (with silica gel cleanup) above DEC Method One criteria in the gravel pad. Surface water samples results collected from five locations on the southern and eastern sides of the gravel pad did not exceed water quality criteria although a sheen was observed at two of these locations when a shovel was used to disturb sediments. At least 21 other locations did not produce a sheen.

Action Information

Action Date Action Description DEC Staff
7/10/2014 Document, Report, or Work plan Review - other Date of receipt for Phase I/II Site Assessment Work Plan prepared by Weston on behalf of ConocoPhilips. Keather McLoone
2/19/2015 Document, Report, or Work plan Review - other Date of receipt of Gwydyr Bay 2/2A Former Exploration Site, Phase II Site Assessment Results. 17 locations within the pad were sampled and analyzed for GRO, DRO/RRO (with and without silica gel), BTEX and 10 percent PAHs. Five surface water locations were sampled and shovel sheen tests were performed in all surface water bodies and themokarst troughs within 100 feet of the pad. Three surface soil locations off the pad were sampled for indicators of salt impacts. GRO up to 612 mg/kg and DRO up to 2,880 mg/kg. Keather McLoone
3/23/2015 Site Added to Database A new site has been added to the database Mitzi Read
3/24/2015 Potentially Responsible Party/State Interest Letter Keather McLoone
3/24/2015 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79752 name: ConocoPhillips Gwydyr Bay 2/2A Keather McLoone
5/12/2015 Document, Report, or Work plan Review - other Date of Gwydyr Bay 2/2A Former Exploration Site, Site Visit and Visual Monitoring Plan. During the summer of 2015 or 2016, a site visit and visual monitoring will be conducted at Gwydyr Bay. If an undisturbed sheen is observed, a surface water sample will be collected and analyzed for DRO (with and without silica gel cleanup), BTEX and PAHs. Also the coastline will be visited to look for evidence of erosion, staining, or other impacts. Keather McLoone
12/2/2015 Document, Report, or Work plan Review - other Date of document entitled Gwydyr Bay 2/2A Former Exploration Site, Site Visit and Visual Monitoring. In response to ADEC's request to follow up on previously reported sheen at this site, Weston conducted a site visit and did not observe any hydrocarbon sheen and no sheen was observed at the two ponds where a sheen was previously observed. Keather McLoone
11/18/2016 Cleanup Complete Determination Issued Based on the information provided to date, it has been determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment and no further remedial action will be required unless new information becomes available that indicates residual contaminants may pose an unacceptable risk. Joshua Barsis
11/18/2016 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79752 ConocoPhillips Gwydyr Bay 2/2A . Joshua Barsis

Contaminant Information

Name Level Description Media Comments
GRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil

Control Type

Type Details
No ICs Required

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.
Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70)

No associated sites were found.

Missing Location Data

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