| Action Date |
Action |
Description |
DEC Staff |
| 10/1/1992 |
Update or Other Action |
A bioventing system pilot study was conducted during 1992. Soil sampling results showed TPH ranging from 6,300 to 17,000 ppm near the bioventing system. Elevated TPH was found in the vicinity of the northern structures up to 20,300 pm, and the southern building complex up to 21,700 ppm. |
Linda Nuechterlein |
| 7/11/1994 |
Update or Other Action |
CH2M Hill report dated 2/10/94 was received which discusses ARCO's 1993 bioventing program which was conducted to initiate soil remediation by CH2M Hill. The system was operated for about 90 days per year from 1993 - 1996. |
Linda Nuechterlein |
| 9/20/1999 |
Update or Other Action |
Site Characterization WP received. |
Linda Nuechterlein |
| 6/17/2003 |
Update or Other Action |
Received 2002 Site Monitoring report for sampling conducted August 2002. |
Linda Nuechterlein |
| 8/5/2004 |
Proposed Plan |
WP received for 2004 assessment & monitoring to include: installation of 18 boreholes with 5 to be MWs; & soil sampling. Results will guide final corrective action effort planned for winter 2005. |
Linda Nuechterlein |
| 8/19/2004 |
Site Added to Database |
TPH. Site entered in CS database by Site Intake staff. |
Sarah Cunningham |
| 3/17/2005 |
Update or Other Action |
Received 2003/2004 SA & monitoring report which documents levels and extent of soil impact. CA/source removal scheduled for summer 2005 under the Charter program. |
Linda Nuechterlein |
| 3/29/2005 |
Meeting or Teleconference Held |
Annual Charter Meeting on this date which is required by the Charter for the Development of the Alaskan North Slope (Charter Agreement) program. The purpose of the meeting was to discuss both Orphan sites listed in Exhibit D.1, and Existing Contaminated sites listed in Exhibit D.2. Progress, site specific activities accomplished during 2004, and cleanup efforts planned for 2005 were discussed for both the orphan and existing contaminated sites listed in the Charter Agreement. |
Linda Nuechterlein |
| 5/13/2005 |
Cleanup Plan Approved |
Approved Corrective Action Plan (CAP) which proposes source removal and landfarming of DRO contaminated soil on this gravel pad which is listed on the Charter D2 list. Work scheduled to be completed during summer 2005. |
Linda Nuechterlein |
| 7/27/2005 |
Site Number Identifier Changed |
Changed Workplan from 10 to 01 because TPH is the COC. |
Former Staff |
| 5/9/2006 |
Conditional Closure Approved |
Based on the information provided to date, ADEC has determined that the East Dock Former Bioventing Area shall be conditionally closed because the hazardous substance contamination has been adequately addressed and does not pose an unacceptable risk to human health or the environment. |
Bill O'Connell |
| 5/9/2006 |
Institutional Control Record Established |
The contaminant concentrations remaining EDFBA were evaluated with regard to the potential exposure pathways and allowed ADEC to determine there is no unacceptable risk to human health or the environment.
Based on the information provided to date, ADEC has determined that no further remedial action is required at the site and a conditional closure of the EDFBA is appropriate, subject to site specific conditions.
This decision 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 in accordance with 18 AAC 75.380(d)(2) and does not preclude ADEC 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 |
| 7/26/2006 |
Update or Other Action |
Site visit conducted on this date. East Dock pad is being used to landfarm contaminated and restricted use gravel from other pads on the slope. Currently the landfarms on the west side of the road contain restricted use gravel that is anticipated to be remediated to Method One levels by the end of summer 2006. On the east side of the road is a larger landfarm containing contaminated gravel that will be landfarmed into 2007. |
Bill O'Connell |
| 5/17/2007 |
Update or Other Action |
Site visit conducted. Large stockpiles of material onsite awaiting treatment in 2007. |
Bill O'Connell |
| 5/22/2007 |
Update or Other Action |
Received 2006 surface water monitoring report. Sheen observed at location SW4, however samples from SW4 and SW5 did not contain contaminants above Alaska Water Quality Standards (AWQS). |
Bill O'Connell |
| 5/22/2007 |
Update or Other Action |
Received 2006 East Dock Landfarming Report and 2007 Operations Plan. 4,900 cy from Kuparuk River State and 9,200 cy from Pad Three East End were brought to the EDLF and spread in 2006. Baseline samples found an area of DRO up to 2,180 mg/kg, which was excavated and added to the landfarm. Cells were divided between restricted use and contaminated gravel and were tilled every three days, fertilized, and kept moist. Restricted use gravel in Cells A and B had DRO below 500 mg/kg by late July 2006 and were removed and another lift was spread at the site. End of season sampling in September 2006 found nearly all soil below 500 mg/kg DRO and suitable for re use. Other material above 500 mg/kg DRO was left to landfarm in 2007.
Five cells will be constructed in 2007 that will treat over 11,000 cy of impacted material. After initial spreading, stockpiles will be sampled to evaluate the need for further treatment. |
Bill O'Connell |
| 7/19/2007 |
Site Characterization Workplan Approved |
Received 2007 Water Quality Monitoring Work Plan. Surface water samples will be collected from SW4 and SW5 to evaluate contaminant trends. |
Bill O'Connell |
| 3/25/2008 |
Update or Other Action |
Received 2007 East Dock Landfarming Report and 2008 Operations plan. Approximately 30,700 cy of gravel was transported to East Dock for treatment in 2007. Petroleum impacted gravel originated from Term Well A, Hurl St., Kuparuk 24-11-12 and Kuparuk 30-11-13. The material was land farmed and treated as in previous years, with approximately 3,300 cy of material left over from 2007 that will require further treatment in 2008. Treated material was used as backfill in the Lisburne 5 reserve pits. Post-treatment pad samples did not indicate significant impact to pad gravel from landfarming activities. In 2008 approximately 20,600 cy of material is anticipated to be transported and treated at East Dock in a manner similar to previous years. |
Bill O'Connell |
| 6/17/2008 |
Update or Other Action |
Received 2007 surface water monitoring report for East Dock Former Bioventing Site. Sheen was not noted at either of the sampling locations SW4, or SW5 and no contaminants were detected. Sample SW4 was moved from its original location due to low water. |
Bill O'Connell |
| 5/22/2009 |
Document, Report, or Work plan Review - other |
Reviewed the 2008 East Dock Landfarming Report and 2009 Operations Plan. See the action following this for the 2009 Operations Plan summary. Approximately 14,825 cy of material originating from Abel State, North Prudhoe Bay State, Lake State, and Kuparuk State 1 was successfully treated to below 500 mg/kg. This volume also includes 2,368 cy of material left over from the 2007 treatment season. Material was spread into lifts approximately 18 inches thick and tilled every third day. This material was stockpiled at the East Dock storage yard for re-use, most likely at the LGI Reserve pits. Pre- and post-treatment baseline sample results indicated that the landfarming activities had a minimal effect on the underlying soil, however the gravel pad thickness was increased along the northern portion of cells C&D to minimize the chance of disturbing drilling waste buried in this area. In general, the mean concentrations of DRO in landfarmed soils was reduced by approximately 50% during a two week treatment period.
|
Bill O'Connell |
| 5/22/2009 |
Document, Report, or Work plan Review - other |
This action pertains to the same document as the action above. During winter 2008/2009, approximately 18,216 cy of contaminated material was transported to East Dock from Put River, Pad 37, the GC-1 SCA Liner Project and BOC Tank 406/4-7. Material will be landfarmed in 4 cells, A, B, C, and D in lifts approximately 15 inches thick which will be tilled every 5 days instead of every 3 as in previous years. Fertilize will be added to landfarmed soils with initial DRO concentrations greater than 750 mg/kg and water will be added if needed. |
Bill O'Connell |
| 7/7/2010 |
Document, Report, or Work plan Review - other |
Reviewed 2009 Landfarming Report and 2010 Operations Plan. Activities conducted in 2009 included pre-landfarming gravel pad sampling (aka post-2008), landfarming of approximately 18,000 cubic yards of gravel, pad grading using post treatment material, and post treatment gravel pad sampling. Four of the 27 pre-landfarming gravel pad samples contained DRO above the landfarm target level of 500 mg/kg, with a maximum of 1,500 mg/kg. The 18,000 cy of contaminated gravel originated from GC1, BOC Tank 406/407, Pad 37, and Put River State #1 and was generally below the 500 mg/kg target level after the initial spreading and tilling event. Following treatment, approximately 3,800 cy of material was used to raise the grade of the pad on the northern end of Cells C & D and the remainder of the gravel was stockpiled at the Northern Storage pad, immediately north of the landfarm areas. Post-landfarming gravel pad samples contained DRO above target level in one sample at 1,170 mg/kg. This sample was collected from the same area as the pre-landfarm sample with the highest DRO concentration. The report suggests that the DRO contamination in this area is related to drilling waste, which lies two feet below the pad surface.
The 2010 Operation plan calls for the use of 4 treatment cells, A, B, C, and D to landfarm approximately 18,500 cy of material generated during exploration site removal and other activities in late 2009/2010. The soil will be spread to a maximum depth of 18 inches, tilled, sampled, then tilled again at least every five days until 500 mg/kg DRO target level is achieved. If necessary, the landfarm will be amended with fertilizer and water and post landfarming gravel pad samples will be collected at the end of the treatment season. |
Bill O'Connell |
| 6/22/2011 |
Document, Report, or Work plan Review - other |
Reviewed 2010 East Dock Landfarming Report and 2011 Operations Plan. Approximately 8,900 cy of hydrocarbon impacted soil were treated during the 2010 season in three treatment cells. Soil originated from Getty State, Kuparuk State, Milne Point A Pad, and Pad 3. Soil in cells not meeting cleanup criteria after the initial tilling event was tilled every 3-5 days. Two lifts were processed through Cells B and D and one lift was processed in Cell C. Baseline sampling found DRO impacts at several areas of the pad, however the presence of historic contamination at the site makes it difficult to discern historical impacts from residual landfarm impacts. Because the site will continue to be used for landfarming, excavation and treatment of soil in these areas is not warranted at this time. Soil in each of the landfarm cells was successfully treated to below the cleanup level of 500 mg/kg DRO and stockpiled for reuse. 2011 operations anticipate the treatment of approximately 39,000 cy of impacted material from 6 sites slated for remedial activities in winter 2011. |
Bill O'Connell |
| 3/6/2012 |
Document, Report, or Work plan Review - other |
Reviewed 2011 EDLF Report and 2012 Operations Plan. Activities conducted in 2011 included baseline pad sampling below Cells C and D, the treatment of approximately 39,000 cy of petroleum impacted soil from Put River 19-10-15, Put River 33-12-13, Kuparuk State 26-12-12, Red Barn, Beechey Point, and Term Well C, soil tilling and sampling, stockpiling of treated soil and post treatment pad sampling. Several lifts of soil were treated in cells C and D, the only cells used in 2011. Where confirmation samples indicated DRO was below 500 mg/kg, the soil in those sub-cells was removed and stockpiled at the East Dock storage pad. Where confirmation samples indicated DRO was above 500 mg/kg, the soil in those sub-cells was left in place and treated along with additional soil. Fertilizer was added on several occasions to encourage biodegradation of contaminants. At the end of the treatment season, approximately 22,500 cy of material remained that was not able to be treated to below 500 mg/kg and was stockpiled for further treatment in 2012. Pre- and post-treatment gravel pad samples collected below Cells C and D at the beginning and end of the season indicated DRO was present at concentrations averaging between 235 and 282 mg/kg, indicating the landfarming activities are having minimal impact on the underlying pad surface. Post treatment samples collected from below Cell B in August 2010 contained DRO up to 689 mg/kg with an average concentration on 317 mg/kg. An additional 2,000 cy of impacted material originating from East Bay State is planned for treatment at EDLF in 2012 along with the remaining soil from 2011. Additional soil may be treated on an as-needed basis. The 2012 Operations Plan indicates soil will continue to be treated as before: a soil lift will be spread, tilled and sampled and depending on the results, the soil will be stockpiled or further treated, with water and fertilizer added as needed. |
Bill O'Connell |
| 7/23/2012 |
Site Visit |
Site visit today. Landfarming is ongoing. |
Bill O'Connell |
| 6/26/2013 |
Document, Report, or Work plan Review - other |
Date of receipt of 2012 Report and 2013 Operations Plan. In 2012, the activities were the same as 2011 with the exception of no post-treatment samples collected in 2012 due to material being treated left in place in some cells and others not being used. Performance sample results from 2012 were similar to 2011. Approximately 6,350 loose cubic yards (LCY) were hauled to the landfarm from East Bay State, West Beach State and T Pad Solid Waste Storage Cell. Material was spread and treated in Cells B, C, and D. Fertilizer was not used during 2012 as it was deemed not necessary. Approximately 17,400 LCY of material were successfully remediated and moved to East Dock Storage Yard for temporary storage until future conditional reuse. About 5,400 LCY of material was left in Cells B, C, and D because it was not fully treated by the end of the 2012 season. In 2013, about 2,250 loose cubic yards of contaminated will be treated. |
Keather McLoone |
| 5/14/2014 |
Document, Report, or Work plan Review - other |
Date of receipt of East Dock Land Farm Report of 2013 Activities and Plan for Future Operations. No landfarming operations are planned for the 2014 season. |
Keather McLoone |
| 10/6/2014 |
Institutional Control Update |
Current project manager chooses to retain management of the site at this time. |
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 |
| 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 |
