| Action Date |
Action |
Description |
DEC Staff |
| 5/25/2004 |
Meeting or Teleconference Held |
DEC, ConocoPhilips & Weston met to discuss pending charaterization work plan & future work planned for summer 2004. |
Linda Nuechterlein |
| 8/6/2004 |
GIS Position Updated |
Topozone. NAD27. |
Sarah Cunningham |
| 8/6/2004 |
Site Added to Database |
DRO and RRO. |
Sarah Cunningham |
| 8/9/2004 |
Site Characterization Workplan Approved |
Final Site Charaterization Work Plan approved. Work tentatively scheduled to begin around August 19, 2004. |
Linda Nuechterlein |
| 7/13/2005 |
Site Ranked Using the AHRM |
Low priority. |
Sarah Cunningham |
| 3/1/2007 |
Update or Other Action |
Received WSRS 1 Site Characterization and Cleanup Plan. Samples were collected from boreholes in 2004 and indicate DRO concentrations up to 19,000 mg/kg at 2.0 ft bgs near the center of the pad. Two areas of historic hydrocarbon contamination have been identified and partially excavated prior to the 2004 investigation. The site cleanup plan specified three areas of contaminated soil for removal, A,B,and C. Contaminated soil wiil be taken to G&I. |
Bill O'Connell |
| 8/21/2007 |
Update or Other Action |
Site visit was made by both CS and Reserve Pit staff during the Conoco Agency visit on Aug. 21st. Site is listed on Charter D.3(Reserve Pit) list but not on Charter D.2 list. There is gravel pad HC contamination and Conoco plans to address both pad and reserve pit issues in 2008 . |
Linda Nuechterlein |
| 12/21/2007 |
Update or Other Action |
Received Plan of Operations and Permit Applications for WSRS 1, which includes an updated CAP and SAP. Approximately 6,000 cy of petroelum impacted soil will be excavated from four areas: A, B, C, and D, that were identified during site investigation activities. Soil will be field screened and segregated into clean, restricted use, and contaminated stockpiles. The stockpiles will be sampled again, clean gravel will be used as backfill, contaminated gravel will be transported to G&I and restricted use gravel will be transported to an approved stagin area for authorized re-use at a later date. |
Bill O'Connell |
| 12/21/2007 |
Update or Other Action |
Received results from samples collected from thermokarst troughs along the SE corner of the pad to confirm previous sampling results that showed elevated DRO concentrations. Samples did not contain hydrocarbon concentrations indicative of contamination, so this area will not be addressed during the 2007 corrective action. |
Bill O'Connell |
| 2/22/2008 |
Exposure Tracking Model Ranking |
|
Bill O'Connell |
| 2/22/2008 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed. |
Bill O'Connell |
| 9/10/2008 |
Site Visit |
Site visit today. Pad removed in winter 2008. Area is fairly wet, with minor sheening noted along former reserve pit, but not on gravel pad. |
Bill O'Connell |
| 11/19/2008 |
Document, Report, or Work plan Review - other |
Received West Sak #1 Completion Report. This pad had apparently been impacted by a previous diesel spill that was partially cleaned up. Using data collected during the Phase II investigation, gravel was segregated into contaminated (DRO > 2,000 mg/kg), restricted use (DRO > 200 mg/kg < 2,000 mg/kg)and clean (DRO < 200 mg/kg). Contaminated gravel was transported to the G&I plant at DS 4 and restricted use and clean gravel were used to backfill the reserve pit, with restricted use gravel encapsulated by clean gravel. Additional clean gravel and a small amount of restricted use gravel was trasnported to DS 1C and used as backfill in the south reserve pit. During removal of the gravel pad, it was discovered that DRO contamination had infiltrated into the underlying tundra to such a depth that removal would have compromised the thermal stability of the area, so excavation was stopped in these areas in consultation with ADEC. Composite confirmation samples collected following removal of the pad contained DRO above the ADEC cleanup level. Several samples contained DRO between 200 mg/kg and 1,000 mg/kg, with three samples containing DRO at 2,620 mg/kg, 3,910 mg/kg, and 37,700 mg/kg. The highest DRo concentration was found in a sample collected adjacent the former wellhead after excavation into the native tundra was halted. Select samples were also analyzed for BTEX and PAHs; none were detected above ADEC cleanup levels. Any area where DRO concentrations exceeded 200 mg/kg was covered with extra overburden to minimize the exposure risk and encourage freeze back of the impacted areas. |
Bill O'Connell |
| 1/13/2009 |
Cleanup Complete Determination Issued |
The Alaska Department of Environmental Conservation, Contaminated Sites Program (ADEC) has completed a review of the environmental records associated with ConocoPhillips West Sak River State 1 located in the Kuparuk Oilfield on the North Slope of 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.
|
Bill O'Connell |
| 1/13/2009 |
Institutional Control Record Established |
Institutional Controls established and entered into the database. |
Bill O'Connell |
| 12/3/2009 |
Document, Report, or Work plan Review - other |
Reviewed rehab progress report for WSRS 1. The site is stable and ready for revegetation. |
Bill O'Connell |
| 1/13/2012 |
Update or Other Action |
Land use update in accordance with 2008 Cleanup Complete with Institutional Controls- Land use has not changed since issuance of closure letter |
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 |
| 3/8/2013 |
Institutional Control Update |
Reviewed 2012 West Sak River State 1 rehabilitation progress report. Ponded surface water covered a significant portion of the pad during the 2012 inspection. Sheen was not noted, but the report recommended specifically checking for sheen during the next assessment. The report indicates successful rehabilitation is anticipated within an acceptable timeframe.
|
Bill O'Connell |
| 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 |
| 2/3/2021 |
Institutional Control Compliance Review |
IC compliance review started. A combined letter for all ConocoPhillips sites with ICs will be issued in early 2021 and land use will be verified. |
Evonne Reese |
| 3/18/2024 |
Institutional Control Update |
DNR-SAIL added as affiliate (Office of Primary Responsibility). For DNR LAS information: ADL# 420769
|
Jennifer McGrath |
| 4/4/2024 |
Document, Report, or Work plan Review - other |
Received the Progress Report for Rehabilitation of West Sak River State 1 Exploratory Wells Site. Additional vegetative cover is needed for the Capped Flare Pit and Former Gravel Pad and further monitoring or vegetative efforts may be done. |
Lisa Krebs-Barsis |
