| Action Date |
Action |
Description |
DEC Staff |
| 5/23/1990 |
Update or Other Action |
(Old R:Base Action Code = SI - Site Investigation). Arco sent in Phase II Investigation Report. All locations investigated except 1-9 have glacial drift which strongly limited the vertical/horizontal migration of hydrocarbons in subsurface soils. At 1-9 tank setting, permeable coarse grained soils have allowed hydrocarbons to migrate substantially in the subsurface soils/groundwater. |
Former Staff |
| 11/1/1991 |
Update or Other Action |
(Old R:Base Action Code = TOTH - Treatment, Other). Results of Bioventing treatability test provided to the Department. |
Former Staff |
| 7/15/1992 |
Update or Other Action |
(Old R:Base Action Code = TAS - Treatment Alternative Study (CS)). ARCO submitted results of evaluation remediation alternatives for SRF. Report identified numerous potential remediation methods for the contaminated soil and groundwater. Report concluded that in-situ bioventing was the optimum alternative for soil remediation, and disposal of contaminated groundwater at class II wells was optimum method for mitigating contaminated groundwater concern. |
Former Staff |
| 8/24/1992 |
Update or Other Action |
(Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). ADEC provided conditional approval of bioventing pilot study. |
Former Staff |
| 12/6/1993 |
Site Added to Database |
Petroleum and glycol contamination. Site broken out of Swanson River Field Tank Setting that was formerly inclusive of all Swanson River Field Tank Setting sites. |
Former Staff |
| 12/6/1993 |
Site Ranked Using the AHRM |
Initial ranking. |
Former Staff |
| 9/20/2000 |
Meeting or Teleconference Held |
Meeting at the oil field with Unocal, Chevron, USFWS to discuss past sampling results, improvements to sampling this year and approach to addressing problems. Will have meeting after this years monitoring report has been reviewed to discuss approach for the sites. Informed participants that in order to comply with USFWS regulations, Method 2 cleanup levels (Tables B and C) must be met, not 10 times or risk assessment. |
Donald Seagren |
| 10/9/2000 |
Update or Other Action |
Re-reviewed the 1999 GW Monitoring Report. Final decision will wait until fall 2000 sampling event. At minimum, Unocal will have to determine extent of free product migration and begin free product recovery where needed. |
Donald Seagren |
| 5/14/2001 |
Update or Other Action |
Reviewed 2000 monitoring report; discussed free product recovery work plan with John Hammelman. |
Donald Seagren |
| 9/12/2002 |
Site Characterization Workplan Approved |
Review and approve Work Plan for Monitoring Well Installation. Coordinate with USFWS. |
Donald Seagren |
| 10/3/2002 |
Update or Other Action |
Site inspection with John Hammelman during MW installation. |
Donald Seagren |
| 4/23/2003 |
Meeting or Teleconference Held |
Annual meeting to discuss 2002 work and 2003 plans. |
Donald Seagren |
| 4/29/2003 |
Update or Other Action |
Reviewed 2002 MW installation report. |
Donald Seagren |
| 4/30/2004 |
Update or Other Action |
File number assigned and entered into the Fileroom DB and CS DB. |
Alyce Hughey |
| 5/27/2004 |
Meeting or Teleconference Held |
Monthly progress meeting. Revised NAPL recovery plan to be submitted by 30 June 04. |
Donald Seagren |
| 3/21/2005 |
Update or Other Action |
Reviewed 2004 GW monitoring report. No appreciable change in the risk to human health or the environment. |
Donald Seagren |
| 10/7/2005 |
Update or Other Action |
Reviewed the Soil Sampling at former idle equipment sites dated 16 August 05. Dro soil contamination exceeding ADEC cleanup levels exists at this site. The contaminated area should be marked for future assessment/remediation. |
Donald Seagren |
| 10/7/2005 |
GIS Position Updated |
Using a Swanson River Layout Map from Unocal, in conjunction with TopoZone Pro and the KPB Parcel Lookup, entered the coordinates for this site. Metadata includes No Topo Basemap, TopoZone Pro Street Maps, Black and White Aerial Photo, on a Medium Size Map, View Scale 1:24,000, Coordinate Datum NAD83. High degree of confidence in accuracy of location. |
Alyce Hughey |
| 3/9/2006 |
Update or Other Action |
Reviewed 05 monitoring report. No significant change to human health or the environment. Annual monitoring & LNAPL recovery to continue |
Donald Seagren |
| 4/2/2007 |
Update or Other Action |
Reviewd 06 monitoring report. No significan change to risk to human helath or the environment. Annual monitoring and LNAPL recovery to continue |
Donald Seagren |
| 5/8/2007 |
Exposure Tracking Model Ranking |
|
Donald Seagren |
| 6/11/2008 |
Update or Other Action |
Site transferred from Don Seagren to Paul Horwath per Linda Nuechterlein. On 6-30-08 transferred from Paul Horwath to Don Fritz per Paul Horwath. |
Alyce Hughey |
| 9/29/2011 |
Document, Report, or Work plan Review - other |
Reviewed the 2010 Groundwater Monitoring Report Swanson River Tank Setting and Flare Pit, dated July 2011, from OilRisk Consultants. During the 2010 groundwater sampling event conducted at Tank Setting 2-15 on November 10, 2010, four of the five monitoring wells were sampled for BTEX. Well TS2-15O was not sampled because it was dry. Analytical results did not detect Benzene, Toluene, Ethylbenzene or Xylenes in any of the monitoring wells sampled. |
Alyce Hughey |
| 11/16/2011 |
Update or Other Action |
Site transferred from Don Fritz to Peter Campbell per Paul Horwath. |
Alyce Hughey |
| 9/24/2015 |
Meeting or Teleconference Held |
Meeting held to discuss long term sampling strategy. Hilcorp proposes sampling the majority of the monitoring wells every four years. |
Peter Campbell |
| 9/19/2017 |
Document, Report, or Work plan Review - other |
SRF Tank Setting 2-15 groundwater wells are monitored on a biennial and a four-year schedule. All viable wells are gauged during each sampling event. 2017 field activities will include: Sample one well for 8260C and PAH: TS2-15O. Three wells are sampled for 8260C every four years and will be sampled next in 2019: TS2-15P, TS2-15R, and TS2-15B. See 2017 Kenai Groundwater Monitoring Program Work Plan. |
Peter Campbell |
| 11/12/2019 |
Document, Report, or Work plan Review - other |
Reviewed the 2017 Groundwater Monitoring Program Report for the Swanson River Field. Only one well was sampled from Pad 2-15 in 2017, well (TS2-15O). Ethyl benzene and naphthalene were detected above cleanup levels. There is not a good down gradient monitoring well on site. |
Peter Campbell |
| 3/25/2020 |
Document, Report, or Work plan Review - other |
Review the 2019 Groundwater Monitoring Report. Well TS2-15O is the only well on site that is impacted above ADEC groundwater cleanup levels. There is no downgradient monitoring well, but considering the levels of impact and distance to potential receptors, this does no appear to be significant. |
Peter Campbell |
| 5/27/2021 |
Document, Report, or Work plan Review - other |
Review the Contaminated Soil and Water Management Plan for 2021 Flowline Installation and Inspection. Plan approved. |
Peter Campbell |
| 7/21/2021 |
Document, Report, or Work plan Review - other |
2021 Groundwater Monitoring Program Work Plan ADEC Approval Letter |
Peter Campbell |
| 8/5/2021 |
Update or Other Action |
Historical contamination discovered during flowline installation work. Impacted soils were discovered at 3.5' below ground surface between the road and on pad water well. Consultant was brought in to collect screening (28) and soil (4) samples. Report pending. |
Peter Campbell |
| 12/10/2021 |
Document, Report, or Work plan Review - other |
Review the SRF 21-01 Trenching & Flowline Installation report dated November 3, 2021. During the flowline installation, shallow soil contamination was discovered that had not been previously identified in assessment work. Hilcorp is required to identify the source and extent of contamination associated with this release. |
Peter Campbell |
| 12/10/2021 |
Workplan Requested |
SRF 21-01 Trenching & Flowline Contamination - Requirement for Workplan |
Peter Campbell |
| 3/23/2022 |
Document, Report, or Work plan Review - other |
Review work plan for the preliminary assessment of an area a newly discovered, apparently historical contamination. Impacts discovered during the installation of a cross pad pipeline. Request that a Phase I assessment be conducted to determine the source. Require that a water well be sampled for impacts. |
Peter Campbell |
| 6/16/2022 |
Document, Report, or Work plan Review - other |
SRF 12-15 2022 Subsurface Investigation Work Plan ADEC Approval |
Peter Campbell |
| 8/1/2022 |
Document, Report, or Work plan Review - other |
2021 Groundwater Monitoring Program Report ADEC Report Plan Approval |
Peter Campbell |
| 6/1/2023 |
Long Term Monitoring Workplan or Report Review |
Review and approve 2023 Groundwater Monitoring Program Work Plan Addendum. |
Peter Campbell |
| 10/12/2023 |
Update or Other Action |
Phone report from Hilcorp today that while doing pad expansion work today historical contamination was discovered when excavating trees. A tree was removed, and hydrocarbons were discovered on the end of the log. Work was halted while investigation work was initiated. |
Peter Campbell |
| 10/16/2023 |
Meeting or Teleconference Held |
During pad expansion construction last week, hydrocarbons were discovered at the south-west corner of the pad as pad work was conducted. A log was removed from the surface exposing hydrocarbons at the water surface. A decision was made by all regulatory parties (BLM, USFWS, Spill Response and Contaminated Sites) to allow the pad expansion to continue and investigate the source and extent of contamination at a later date. |
Peter Campbell |
| 2/28/2024 |
Document, Report, or Work plan Review - other |
Review 2022 Site Investigation Report, Pad 12-15 (TS 2-15) dated May 23, 2023. Historical contamination was encountered during SRF 21-01 flowline trenching activities between well pad SRU 12-15 and Tank Setting (TS) Building 2-15, located in the northern part of the Hilcorp Alaska, LLC (Hilcorp)-operated SRF. Field work included installation of 7 soil borings to the north, south, and east of the contaminated trench perimeter. A temporary monitoring well was installed with groundwater at 10.01’bgl. Groundwater was purged dry with poor recovery. DRO (2040 ppm) and RRO (4520 ppm) present in groundwater.
1,2,4-Trimethylbenzene, 1,3,5-Trimethylbenzene, ethylbenzene, Naphthalene, Xylenes, tert-Butylbenzene, Naphthalene, Diesel Range Organics were present in soil, primarily in SB-04, with Naphthalene present in SB-05, SB-06 and SB-07. See Figure 2 of the 2022 Site Investigation Report, Pad SRU 12-15 (TS 2-15), Swanson River Field for details.
The report concludes, “Although some contamination remains in soil and groundwater at this site, it is not practicable to delineate the extent of impacted soil or perform further excavation to the south of the trench due to the presence of infrastructure and the roadway. It is recommended that remaining contamination be addressed at the end of pad life.” The report did not identify or speculate on a source for the release. The area of impacted soils and groundwater is near a line heater.
|
Peter Campbell |
