| Action Date |
Action |
Description |
DEC Staff |
| 5/11/2000 |
Update or Other Action |
DEC received 1999 Report of Findings dated March 2000 which documents field data collection activities during 1999. |
Linda Nuechterlein |
| 4/24/2002 |
Update or Other Action |
Report of 2001 Monitoring Program received. |
Linda Nuechterlein |
| 5/20/2004 |
Update or Other Action |
2003 Monitoring report received. |
Linda Nuechterlein |
| 8/24/2004 |
Update or Other Action |
Annual water quality monitoring plan dated 8/11/04 was received from Oasis. |
Linda Nuechterlein |
| 10/5/2004 |
Site Added to Database |
DRO contamination. See problem statement. |
Sarah Cunningham |
| 3/3/2006 |
Update or Other Action |
Annual water quality monitoring plan dated Jan. 16, 2006 was received by ADEC. |
Linda Nuechterlein |
| 7/18/2007 |
Site Characterization Workplan Approved |
Received 2007 water quality monitoring plan for PBOC generator module. Three monitoring wells and three surface water locations will be sampled and ORC socks will be replaced in three wells. |
Bill O'Connell |
| 9/28/2007 |
Exposure Tracking Model Ranking |
Initial ranking |
Bill O'Connell |
| 1/2/2008 |
GIS Position Updated |
Position updated via CS GIS webmap |
Grant Lidren |
| 6/17/2008 |
Site Characterization Report Approved |
2007 Monitoring report and request for conditional closure received. Three surface water samples were collected from established monitoring points and three active-layer water samples were collected from monitoring wells. AWQS were exceeded in one surface water sample collected at SW01, with BTEX up to 0.01844 mg/l. Active layer water samples had benzene up to 0.15 mg/l, GRO up to 11.8 mg/l and DRO up to 8.06 mg/l. |
Bill O'Connell |
| 7/21/2008 |
Update or Other Action |
Response letter sent to BP. Based on previous data, it appears that the extent of pore water impacts at the site has not been completely delineated. ADEC will consider a reduced monitoring schedule, however conditional closure is not an option at this time. |
Bill O'Connell |
| 7/8/2009 |
Document, Report, or Work plan Review - other |
Reviewed 2009 Work Plan for PBOC Generator Module. Up to two monitoring wells will be installed with the objective of delineating porewater impacts at the site, and at least one soil sample will be collected from each borehole. Active layer water samples will be collected from the new wells and also five existing wells, and surface water samples will be collected from three surface water monitoring locations. |
Bill O'Connell |
| 6/11/2010 |
Document, Report, or Work plan Review - other |
Reviewed 2009 Site Characterization and Monitoring Report. Soil samples were collected from boreholes that were completed as monitoring wells MW-04 and MW-05. Porewater samples were collected from the the newly installed wells, and also from three existing wells. Surface water samples were collected from three existing surface water monitoring locations. Soil samples collected from the new boreholes contained DRO up to 1,560 mg/kg and GRO up to 822 mg/kg, both in a sample from 6-7 feet bgs in borehole BH-05. Contamination was not noted in samples nearer the surface, suggesting contamination migrated to these locations through the subsurface from the source area. Porewater samples contained contaminants above groundwater cleanup levels in each of the wells sampled, with DRO detected up to 8.66 mg/l in well MW-05, GRO up to 12.4 mg/l in well MW-02, and benzene up to 0.163 mg/l also in MW-02. Surface water samples contained detectable concentrations of DRO, but undetectable concentrations of TAH and TAqH. The new monitoring wells were installed about as far downgradient as is currently possible, given the surroundiung development, however hydrocarbon impacts have not been fully delineated to the north |
Bill O'Connell |
| 7/20/2011 |
Document, Report, or Work plan Review - other |
Reviewed 2011 work plan for PBOC Generator Module. Porewater samples will be collected from 5 monitoring wells and surface water samples will be collected from 3 established monitoring locations. Porewater samples will be analyzed for DRO, GRO, and BTEX. Surface water samples will be analyzed for DRO, GRO, BTEX, and PAHs. ORC socks will be removed 24 hours prior to sample collection then replaced with new ones after sampling is completed. |
Bill O'Connell |
| 8/22/2011 |
Site Visit |
Site visit with BP and Oasis |
Bill O'Connell |
| 8/17/2012 |
Document, Report, or Work plan Review - other |
Reviewed 2011 Monitoring Report for PBOC Generator Module. Five monitoring wells were sampled following removal of ORC socks the day before and surface water samples were collected from two locations. Surface water sampling location SW-03 was dry. Pore water samples contained DRO up to 6.81 mg/l at MW-03, GRO up to 14.9 mg/l in MW-02, and benzene up to 0.183 mg/l in the same well. Surface water samples did not contain contaminants above AWQS. These results are consistent with previous results indicating a stable plume. ORC socks were replaced in the wells following sampling. |
Bill O'Connell |
| 5/10/2013 |
Update or Other Action |
Discrete areas of hydrocarbon contamination were noted in soil in the immediate vicinty of this site during installation of a gas line in 2012. |
Bill O'Connell |
| 8/8/2013 |
Document, Report, or Work plan Review - other |
Reviewed PBOC Generator Module water quality monitoring work plan. Pad pore water samples will be collected from five wells, surface water samples will be collected from three established surface water monitoring locations, and field observations will be recorded. |
Bill O'Connell |
| 3/28/2014 |
Document, Report, or Work plan Review - other |
Date of receipt of 2013 RCRA Annual Report. Appendix A addresses work conducted at SWMU Project Groups to Fulfill Other Obligations and includes documenting the type of work performed during the summer of 2013 at this site. Results are to be reported elsewhere. During 2013, ORC socks were removed from monitoring wells 24 hours prior to sampling and the five well's samples were analyzed for GRO, DRO, and BTEX. |
Keather McLoone |
| 4/14/2014 |
Document, Report, or Work plan Review - other |
Date of receipt of 2013 PBOC Generator Module Monitoring Report. Activities included surface water sampling and active layer sampling. Surface water was sampled for BTEX, GRO, DRO, and PAHs and showed no constituents, including TAH or TAqH, with results above standards. Active layer sampling of the pad porewater was for BTEX, GRO, and DRO. Field parameters showed some results outside Alaska Water Quality Standards such as a well with a pH reading of 11.44, possibly from the ORC. Mann-Kendall Trend Analysis was performed on the well/active layer data. Sampling was performed on August 20, 2013. Not clear when the ORC socs were deployed but they were removed a day before sampling, although there is some description in the site history as well as the summary and conclusions sections about sock deployment and removal. |
Keather McLoone |
| 9/4/2014 |
Site Visit |
|
Keather McLoone |
| 7/29/2015 |
Document, Report, or Work plan Review - other |
Date on Transmittal of the 2015 Contaminated Sites Water Quality Monitoring Workplan for D Pad, Service City, COTU North, COTU South, BOC Bulk Fuel Facility Utilidor, DSM Shop, PBOC Generator, MCC Fuel Island. As of 10/15/15 an approval letter hadn't been sent because ERM/BP had not yet provided the 2014 COTU South report although it has been reportedly just about ready for 2 months. |
Keather McLoone |
| 7/25/2016 |
Document, Report, or Work plan Review - other |
Reviewed the PBOC Generator Module 2015 Contaminated Sites Monitoring Report, dated June 2016, for the BPX PBOC Generator Module (former ARCO) site. Activities described in the report mainly consisted of biennial water monitoring of Wells MW-01 through MW-05, and sampling three surface water locations (SW-01 through SW-03). A sample could not be collected from SW-03 in 2015 because there was no water present. A sheen was identified at SW-01, although the field team could not determine if the sheen was petrogenic or biogenic in nature. However, sample results from SW-01 and SW-02 did not exceed Alaska Water Quality Standards (AWQS) for TAH.
The samples collected from Monitoring Wells MW-01 through MW-05 all exhibited concentrations of diesel range organics (DRO) and total aromatic hydrocarbons (TAH) above applicable standards; concentrations of DRO ranged from 3.3 to 1.9 mg/l and concentrations of TAH ranged from 0.418 mg/l to 5.58 mg/l. Gasoline range organics ranged from 0.81 mg/l to 10 mg/l and benzene ranged from 0.0045 to 0.16 mg/l. Contaminant concentrations in the active layer/pad-pore water appear to be consistent with historical data.
Recommendations provided in the report included continued biennial monitoring and sampling of Wells MW-01 through MW-05, and the three surface water locations. ADEC concurs with the recommendations. |
Joshua Barsis |
| 6/7/2017 |
Document, Report, or Work plan Review - other |
Reviewed the 2017 Biennial Contaminated Sites Monitoring Work Plan, dated June 2017. This work plan was prepared for the following three Contaminated Sites: 300.38.229; 300.38.254, and 300.38.045. Proposed activities generally consist of pad porewater and surface water sampling. |
Joshua Barsis |
| 5/10/2018 |
Document, Report, or Work plan Review - other |
Reviewed the PBOC Generator Module 2017 Contaminated Sites Monitoring Report and 2019 Work Plan, dated April 2018, for the BPX PBOC Generator Module (former ARCO) site. The field effort was completed in August 2017 and consisted of biennial water monitoring of Wells MW-01 through MW-05, and sampling three surface water locations (SW-01 through SW-03). Similar to 2015, a sample could not be collected from SW-03 because there was no water present.
Sample results from Surface Water Samples SW-01 and SW-02 did not exceed Alaska Water Quality Standards (AWQS) for total aromatic hydrocarbons (TAH) or total aqueous hydrocarbons (TAqH). However, pore water samples from wells considered closely connected to surface water (MW-01, MW-02, and MW-03) did exceed AWQS for TAH and TAqH. All samples collected from Monitoring Wells MW-01 through MW-05 had petroleum constituents above Table C levels. Diesel range organics (DRO) was above Table C levels in all the wells, and ranged from 2.65 mg/l to 7.02 mg/l in the most contaminated well.
Recommendations provided in the report (Section 6 Proposed 2019 Work Plan) included continued biennial monitoring and sampling of Wells MW-01 through MW-05, and the three surface water locations. ADEC approved the report and work plan in a letter dated May 10, 2018.
|
Joshua Barsis |
