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Site Report: Hilcorp Milne Point B Pad (BPX)

Site Name: Hilcorp Milne Point B Pad (BPX)
Address: East of Milne Point Road, Milne Point Unit, Prudhoe Bay, AK 99734
File Number: 300.38.253
Hazard ID: 4265
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 70.474350
Longitude: -149.414500
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

DRO soil samples collected from the toe of the pad, west of Well House B-6 in both 1994 and 1996 resulted in concentrations of 1,200 and 655 mg/kg, respectively. A surface water sample collected from the tundra pond in this vicinity had a DRO concentration of 2.99 mg/L. According to the Milne Point Spill Database, the area around Well House B-15 received two releases of diesel fuel in 1985 totaling 976 gallons. One surface soil sample was collected during a 1994 investigation and DRO, RRO, and GRO were detected at concentrations of 3,900 mg/kg, 360 mg/kg, and 330 mg/kg, respectively. Remedial excavation of ~35 cubic yards in 1996 had three samples ranging from 37.5 mg/kg to335 mg/kg. Several releases have been documented since 1986 in the area around Well House B-20 including releases of 100 gallons of crude and 252 gallons of diesel. Samples from soil borings drilled during the 1994 Phase I work contained concentrations of DRO up to 1,800 mg/kg, RRO up to 330 mg/kg, and GRO up to 350 mg/kg. Approximately 25 cubic yards of potentially contaminated gravel was removed and hauled to the temporary storage pit on MPU "D" Pad for thermal remediation. The results of seven soil stockpile samples for DRO ranged from 4.98 to 1,060 mg/kg. A surface water sample collected from the northwestern corner of the pad during this investigation resulted in DRO of 1.08 mg/L which is below the method reporting limit. Milne Point "B" Pad is an active production facility with approximately 25 well houses and a production module surrounding a former reserve pit. Until more accurate information is found, the spill date is based on a generic date assumed for the calendar year 1985.

Action Information

Action Date Action Description DEC Staff
4/6/2005 Update or Other Action Received 2004 Contaminated Site Monitoring Report. Diesel contamination in two locations: West of Well House B-15 and near Well House B-20. Two diesel spills totaling 976 gallons were reported in 1985 near Well House B-15. 35 CY of impacted gravel excavated from this site in 1996, confirmation samples contained DRO up to 335 mg/kg. Several release also documented near Well House B-20 including crude and diesel. 25 CY of impacted gravel excavated in 1996, confirmation samples contained DRO up to 1,060 mg/kg. Surface water sampling conducted in 2003 found no water quality exceedances. 2004 water quality monitoring found biogenic and possible hydrocarbon sheen. DRO was detected at location B3 at 1.16 mg/l, however the lab noted that the chromatogram was consistent with biogenic DRO and not diesel. VOCs were not detected. Bill O'Connell
6/21/2006 Site Added to Database GRO, DRO, and RRO soil contamination above cleanup levels. DRO water contamination above cleanup levels. Bill Petrik
6/21/2006 Site Ranked Using the AHRM Initial ranking. Bill Petrik
6/21/2006 Update or Other Action File number issued 300.38.253. Aggie Blandford
6/21/2006 GIS Position Updated Used Figure 1, "MPU B Pad Site Location Map" from the Oasis Environmental "MPU B Pad, 2004 Contaminated Site Monitoring Report, Milne Point" dated 3/22/05 and Figure 1, "MPU B Pad Site Location Map" from the Oasis Environmental "MPU B Pad, 2005 Annual Water Monitoring Report, Milne Point Unit" dated 12/7/05 and TopoZone Pro in conjunction 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 1:63,360 Scale USGS Topo Base Map, Large Map Size, at 1:50,000 Scale. Low confidence in the accuracy of the coordinates. Suggest taking GPS reading to improve accuracy. Bill Petrik
6/26/2006 Update or Other Action Recieved 2005 Annual Water Monitoring Report. This report identifies another contaminated area west of Wellhouse B-6. Samples collected here at the toe of the gravel pad in 1994 and 1996 had DRO in gravel up to 1,200 mg/kg and DRO in surface water at 2.99 mg/l. In 2005, surface water samples were collected from established monitoring points B1, B2, and B3. TAH not detected in any sample for the third year in a row. DRO has increased in surface water up to 2.85 mg/l, however no sheen was noted. DRO attributed to biogenic interference. Report recommends additional sampling to verify 2005 results. Bill O'Connell
3/22/2007 Exposure Tracking Model Ranking Bill O'Connell
8/10/2007 Site Characterization Workplan Approved Recieved 2007 water quality monitoring work plan. Surface water samples will be collected from the three established SW monitoring locations and a visual inspection will be conducted. Bill O'Connell
6/17/2008 Site Characterization Report Approved Received 2007 Monitoring Report and Request for Conditional Closure for MPU B Pad. Surface water samples were collected from 3 established sampling locations. DRO was detected up to 0.77 mg/l. TAH and TAqH analytes were not detected. Bill O'Connell
7/11/2008 Update or Other Action Response to conditional closure request mailed to BPXA. Surface water samples at the pad have not been analyzed for PAHs (TAqH) in accordance with AWQS. ADEC requests samples be analyzed for PAHs next sampling round after which the request for conditional closure will be reconsidered. Bill O'Connell
12/13/2012 Document, Report, or Work plan Review - other Reviewed MPU B Pad monitoring report. Three surface water samples were collected from established monitoring locations and a visual inspection was conducted. BTEX and PAHs were not detected in the samples and there was no indication of contamination evident in the visual inspection. Bill O'Connell
12/21/2012 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 75231 Spills. Bill O'Connell
12/28/2012 Cleanup Complete Determination Issued The Alaska Department of Environmental Conservation, Contaminated Sites Program (ADEC) has completed a review of the environmental records associated with BPX Milne Point B Pad, located in the Milne Point Unit near Prudhoe Bay, Alaska. 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 as long as the site is in compliance with established institutional controls (ICs). Bill O'Connell
12/28/2012 Institutional Control Record Established Institutional Controls established and entered into the database. Bill O'Connell
1/8/2013 Institutional Control Compliance Review IC Unit conducted IC review conducted and reminder system set-up to contact responsible party in 2023. Kristin Thompson
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
3/19/2024 Institutional Control Update DNR-SAIL added as affiliate (Office of Primary Responsibility). For DNR LAS information: ADL# 421493 Jennifer McGrath
8/2/2024 Institutional Control Compliance Review IC compliance review completed on this date. An IC reminder letter was issued to the responsible party and cc’d to the landowner. The next review will be in ten years’ time. Gaige Robinson

Contaminant Information

Name Level Description Media Comments
DRO > Method 1 (Arctic only) Soil

Control Type

Type Details
Signed CS Determination

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.
When Contaminated Soil is Accessible, Remediation Should Occur
Periodic Review 10-year cycle

No associated sites were found.

Missing Location Data

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State of Alaska Department of Environmental Conservation

P.O. Box 111800
Juneau, AK 99811-1800
Phone: 907-465-5066
Fax: 907-465-5245
TDD: 800-770-8973
Physical Location: 410 Willoughby