| Action Date |
Action |
Description |
DEC Staff |
| 4/1/2002 |
Site Characterization Report Approved |
Two gravel pads located at the site, the Main Pad and the Camp Pad. Field work conducted in 2000 included 15 gravel pad samples (10 Main pad, 5 Camp pad) analyzed for DRO, RRO, BTEX, and PAHs; 9 off-pad surface water samples analyzed for intrinsic parameters and BTEX; and 14 tundra soil samples analyzed for DRO, RRO, BTEX, and PAHs.
At the Main pad, 4 samples contained DRO above Method One Arctic Zone cleanup levels with a maximum concentration of 24,700 mg/kg. RRO also detected above Method One at 8,670 mg/kg.
At the Camp pad, one sample contained DRO above Arctic zone cleanup levels at 8,860 mg/kg.
Of the 14 tundra soil samples, two contained DRO above the Method One cleanup level at 1,130 mg/kg and 728 mg/kg after silica gel cleanup. Surface water samples did not contain Benzene, DRO was not analyzed.
Reserve pit berms at Main pad and Camp pad have both breached and reserve pits are flooded and in communication with Lake water.
Flare pit has reportedly been backfilled. |
Linda Nuechterlein |
| 6/1/2005 |
Update or Other Action |
Eco Risk Assessment report received and commented upon by Lindsay Smith, ADEC. Objective of RA was to evaluate risk to ecological receptors from exposure to petroleum hydrocarbons, particulary to areas of surface water affected by sheen from hydrocarbons present in sediment.
|
Linda Nuechterlein |
| 1/9/2006 |
Update or Other Action |
BP's request to extend the cleanup schedule for both Lake State 1 and North Prudhoe Bay State 1 through 2008 has been approved. Both of these sites are on the Charter Agreement D.2 list. |
Linda Nuechterlein |
| 6/12/2006 |
Site Added to Database |
Exceedances of Alaska Water Quality Standards for Total Iron and Total Manganese and Arctic Zone Method 1 Cleanup Levels for DRO and RRO. |
Bill Petrik |
| 6/13/2006 |
GIS Position Updated |
Used TopoZone Pro in conjunction with Figures 1 and 2 of the Oasis Environmental "2006 Work Plan, Lake State Phase II Site Assessment, Prudhoe Bay Unit" dated 4/11/06 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 |
| 6/13/2006 |
Site Ranked Using the AHRM |
Initial ranking. |
Bill Petrik |
| 6/13/2006 |
Update or Other Action |
File number issued 300.38.251. |
Aggie Blandford |
| 6/19/2006 |
Site Characterization Workplan Approved |
Workplan for 2006 received in April for work to be conducted that month. Work plan states that a drill rig will be mobilized to the site and soil samples will be collected from boreholes in the reserve pits, gravel pads, flare pit, sewage lagoon, and surrounding tundra. Objective of gravel pad boreholes is to characterize hydrocarbon levels and estimate the amounts of clean, restricted use, and contaminated gravel at each of the pads. Soil samples will be analyzed for DRO/RRO, with 20% o the samples also analyzed for GRO/BTEX. |
Bill O'Connell |
| 7/26/2006 |
Update or Other Action |
Site visit conducted on 7/26 followed by a flyover on 7/27. Primary issue at this site is that the reserve pit berm has breached allowing reserve pit material to interact with the Lake. Flyover noted several drums and other debris in the surface water adjacent to the pads. |
Bill O'Connell |
| 9/20/2007 |
Update or Other Action |
Lake State #1 Phase 2 Site Assessment Report and Corrective Action Plan dated 9/13/2007 submitted by Oasis and recieved by ADEC on this date. Over a hundred soil samples were taken to evaluate extent of contamination. DRO contamination was found to be up to: 28,900 mg/kg on the Gravel Pad, 12,500 mg/kg in adjacent Tundra, 6,380 in the Sewage Lagoon, 449 mg/kg in the Flare Pit, and up to 6,240 mg/kg in the Reserve Pit and Camp Pit. On the south end of Reserve Pit and Camp Pit the berms have subsided below lake level and the water in each pit is now in communication with the lake. Futhermore metal debris was found in the lake. Futher remedial action is planned during winter 2007/2008 including:removing of contamintated gravel and backfilling with gravel containing less than 500 mg/kg DRO, removing contaminated tundra, removing debris from lake, performing confirmation sampling, and spreading overburden on gravel pad and parts of the tundra mat. |
Grant Lidren |
| 1/29/2008 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed. |
Grant Lidren |
| 3/25/2009 |
Final Cleanup Report Reviewed |
Reviewed Lake State 1 Corrective Action Final Report. The main gravel pad and the camp pad were entirely removed, the reserve pit was excavated and backfilled, contaminated tundra material was removed, and the well was cut off 5 feet below tundra grade. Approximately 16,000 cubic yards of clean gravel was removed from the pads and used as backfill in the reserve pit along with 395 cy of conditional use material from Area B, 2,646 cy of clean material from the Oxbow pit, and 1,026 cy of conditional use gravel from the East Dock Land Farm. Approximately 9,683 cy of contaminated gravel and tundra was removed and transported to the East Dock Land Farm for treatment. Following excavation work, confirmation soil samples were collected at the former camp pad and main pad and from areas of tundra that had been removed. Confirmation samples from the former main pad area contained DRO up to 1,550 mg/kg below area D. Confirmation samples from the former camp pad area contained DRO up to 842 mg/kg and confirmation samples from the impacted tundra areas contained DRO up to 354 mg/kg. |
Bill O'Connell |
| 4/3/2009 |
Cleanup Complete Determination Issued |
The Alaska Department of Environmental Conservation, Contaminated Sites Program (ADEC) has completed a review of the environmental records associated with BPX Lake State 1 located near Prudhoe Bay, Alaska. Based on the information provided to date, the ADEC has determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment, and this site will be closed. This site is included on the Existing (Contaminated) Sites Charter for the Development of the Alaska North Slope (Paragraph II.A.3; Exhibit D.2) D-2 list. Since this site no longer poses an environmental risk, it will be removed from the D-2 list on the Existing BP Charter for Development of the Alaska North Slope Program. |
Bill O'Connell |
