| Action Date |
Action |
Description |
DEC Staff |
| 12/6/1993 |
Site Added to Database |
Petroleum contamination. |
Former Staff |
| 12/6/1993 |
Site Ranked Using the AHRM |
Initial ranking. |
Former Staff |
| 5/31/2000 |
Meeting or Teleconference Held |
Meeting with Unocal, Tesoro and USFWS to discuss site and develop plan. Tesoro is RP, having taken over from KPL. Tesoro will send update report detailing what they have been doing to address the contamination. By the end of July, 00, Tesoro will submit work plan for review and comment on how they plan to address the soil and GW contamination and the free product on the GW. Cleanup levels were discussed. Based in the Refuge Regulations, Method 2 cleanup using tables B and C will be used. |
Donald Seagren |
| 6/26/2000 |
Update or Other Action |
Reviewed 1999 Annual Groundwater Monitoring Report. |
Donald Seagren |
| 10/11/2000 |
Update or Other Action |
Reviewed Corrective Action Plan and Summary Report. Tesoro and Unocal will need to meet to determine each companies liability and who will pay for what. Will treat site as a single site, not 2 separate sites. |
Donald Seagren |
| 12/18/2000 |
Update or Other Action |
Review response letter from KPL concerning project coordination with Unocal. |
Donald Seagren |
| 3/27/2001 |
Update or Other Action |
Review 2000 Annual Groundwater Monitoring Report. |
Donald Seagren |
| 4/24/2002 |
Meeting or Teleconference Held |
Annual meeting with Unocal, USFWS, BLM, ADEC and Oil Risk Consultants to discuss work accomplished in 01 and work to be conducted in 02. Discussed trying to get this project moving. Unocal is vacating the electric shop building. |
Donald Seagren |
| 7/30/2002 |
Update or Other Action |
Conversation with John Hammelman. Work plan will be developed and assessment conducted this year to fill in data gaps. Additional site assessment and/or corrective action work to be conducted in 2003. |
Donald Seagren |
| 10/1/2002 |
Site Characterization Workplan Approved |
Reviewed and approved work plan for additional site characterizations and installation of 5 additional monitor wells. |
Donald Seagren |
| 12/13/2002 |
Update or Other Action |
Reviewed annual GW monitoring report from Tesoro. |
Donald Seagren |
| 4/23/2003 |
Meeting or Teleconference Held |
Annual meeting to discuss 2002 work and plans for 2003. |
Donald Seagren |
| 4/28/2003 |
Site Characterization Report Approved |
Reviewed 2002 site investigation report. |
Donald Seagren |
| 1/26/2004 |
Update or Other Action |
Reviewed 2003 Annual GW Monitoring Report from Tesoro. |
Donald Seagren |
| 4/28/2004 |
Update or Other Action |
File number assigned and entered into the Fileroom DB and CS DB. |
Alyce Hughey |
| 3/31/2005 |
Update or Other Action |
Reviewed 04 monitoring report and 05 monitoring and LNAPL recovery plan. there is a hydraulic separation between the pig launcher and tank farm areas. LNAPL thickness at the site has remained stable over the past year. Between 0.5 - 1 gallon of LNAPL is generally recovered each month. benzene, GRO, & DRO concentrations have been stable or decreased over the past year. Based on past monitoring & recovery data, the sampling and monitoring frequency will be altered slightly for 05. this will be reviewed and modified further if needed. |
Donald Seagren |
| 10/6/2005 |
GIS Position Updated |
Using Figures 1 and 2 from a 2003 Annual Groundwater Monitoring Report, Swanson River Facility, from Kent & Sullivan, Inc., dated January 19, 2004, 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 1:10,000, Coordinate Datum NAD83. High degree of confidence in accuracy of location. |
Alyce Hughey |
| 1/10/2006 |
Update or Other Action |
Reviewed annual monitoring report. 3 MWs conatining LNAPLs not smpled. There is hydraulic spearation between the pig launcher and the tank farm area.LNAPL thickness has remained stable over the past year. KSMW8 exceeded Table C levels for benzene and GRO. this MW will continue to be monitored to try to determine the cause for thechange. Dissolved hydrocarbon concentreations in the tank farm area have remained stable or decreased. Between 0.5 and 1 gallon of LNAPL is recoveed each event. No significant changes in risk to human health or the environment. |
Donald Seagren |
| 3/9/2007 |
Update or Other Action |
Reviewed 06 annual Gw monitoring report. the hydraulic separation between the pig launcher and former tank farm areas is evident. LNAPL thinckness has remained stable over the past year. Between 0.5 and 1 gallon of LNAPL is recovered each event.KSW8, upgradient of the source area, showed an increase in benzene and GRO during September 06. The concentrations have been stable over the past years. this will b einvestigated further in 07. No significant change to risk to humna health or the environment |
Donald Seagren |
| 3/9/2007 |
Exposure Tracking Model Ranking |
|
Donald Seagren |
| 2/6/2008 |
Update or Other Action |
Reviewed 2007 Annual GW Monitoring report. KSW-7 was not found due to recent grading &/or construction work in the area either buried or destroyed the well monument. There is an evident hydraulic separation between the pig launcher and the tank farm area. Water levels have dropped up to 5' in the pig launcher area and 1' in the tanks farm, resulting in KSW-8 being dry. LNAPL thickness has remained stable over the past year due to LNAPL recovery that was initiated in May 2000. Dissolved hydrocarbon concentrations in the tank farm plume have remained stable or decreased. |
Donald Seagren |
| 5/9/2008 |
Update or Other Action |
discussed legal ownership of the electrice shop/tank farm area with Scott Thorsell, Chevron. Attorneys for Chevron and Tesoro met and tresearched the site. From the documentation he has, the former tank farm area is part of the property owned by Tesoro. Tesoro has stated that they do not own this piece and the cleanup of rhe former tank farm area is Chrevorns responsiblity. ADEC requested Chevron to develop a plan to begin cleaning up this part of the site. Scott will send a letter/email with documentation of the leagal ownership for ADEc files. |
Donald Seagren |
| 5/9/2008 |
Update or Other Action |
discussed legal ownership of the electrice shop/tank farm area with Scott Thorsell, Chevron. Attorneys for Chevron and Tesoro met and tresearched the site. From the documentation he has, the former tank farm area is part of the property owned by Tesoro. Tesoro has stated that they do not own this piece and the cleanup of rhe former tank farm area is Chrevorns responsiblity. ADEC requested Chevron to develop a plan to begin cleaning up this part of the site. Scott will send a letter/email with documentation of the leagal ownership for ADEc files. |
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 |
| 4/6/2010 |
Update or Other Action |
On April 6, 2010, Tesoro was sent a review letter regarding the Groundwater Monitoring Report for the Swanson River Electric Shop site, prepared on behalf of Tesoro Alaska Company (Tesoro) by Jeremy Yancey (Kent & Sullivan, Inc.). Several comments/issues were raised in that letter. |
Don Fritz |
| 6/24/2010 |
Update or Other Action |
On April 6, 2010, Tesoro was sent a review letter regarding the Groundwater Monitoring Report for the Swanson River Electric Shop site, prepared on behalf of Tesoro Alaska Company (Tesoro) by Jeremy Yancey (Kent & Sullivan, Inc.). Several comments/issues were raised in that letter. Tesoro provided e-mail responses that addressed some of the issues/comments. Tesoro was sent another letter that requested Tesoro to address two comments that they failed to adequetly address |
Don Fritz |
| 6/28/2010 |
Meeting or Teleconference Held |
Phone call with Peter Ribbens regarding my letter. He wanted to seek an extension to provide a work plan in response to my June 24th letter. He will be gone to China for a month, and wanted to be involved in the work plan. I told him that we were seeking a response regarding their intent to proceed, and that they could identify a timeframe for a work plan in the written response. |
Don Fritz |
| 11/3/2011 |
Update or Other Action |
Groundwater monitoring is being conducted at this site on an annual basis. Last report received was the 2010 Annual Groundwater Monitoring Report, dated April 21, 2011. |
Alyce Hughey |
| 11/16/2011 |
Update or Other Action |
Site transferred from Don Fritz to Peter Campbell per Paul Horwath. |
Alyce Hughey |
| 12/9/2011 |
Document, Report, or Work plan Review - other |
Reviewed the 2010 Annual Groundwater Monitoring Report, dated April 21, 2011, from Kent & Sullivan. The 2010 groundwater sampling event was performed on September 9, 2010, with five wells not detecting did any of the analytes, where two wells are showing a decrease in concentrations, and two wells ESMW-A and KSW-2 were not sampled due to the presence of LNAPL. LNAPL recovery was performed quarterly (March 26, 2010, June 24, 2010, September 9, 2010 and December 22, 2010). A total of 3.3 gallons of LNAPL plus water was recovered in 2010 with one third of the volume was groundwater. The total amount of LNAPL recovered over the history of LNAPL recovery is 172 gallons. The LNAPL recovery has shown a decreasing trend since 2000 with KSW-5 having no product recovered and ESMW-A has almost been depleted of product. It has been observed that the LNAPL thickness in well KSW-2 is closely related to the groundwater levels, during high water levels LNAPL thickness increases. |
Alyce Hughey |
| 4/27/2012 |
Document, Report, or Work plan Review - other |
Issued a letter requesting the work plan submittal for additional product recovery wells to be placed in the area of the pig launch area, additional investigation to explain the increase in concentrations in well KSW-8, additional remediation actions within the formr tank farm area, the installation of recovery wells within the areas of borings KSB-3 and KTFC-5, and other additional site status update information after reviewing the April 21, 2011, 2010 Annual Groundwater Monitoring Report, prepared by Kent & Sullivan. |
Peter Campbell |
| 8/1/2012 |
Document, Report, or Work plan Review - other |
Reviewed the 2011 Annual Groundwater Monitoring Report, dated June 29, 2012, from Kent & Sullivan. The 2011 groundwater sampling event was performed on September 27, 2011. Two monitoring wells were sampled (KSW-8 and KSW-6), with only one well KSW-8 detecting Benzene above the groundwater cleanup levels at 0.00868 mg/L. Monitoring wells ESMW-1 and KSW-2 were not sampled due to the presence of LNAPL. Well KSW-5 was not sampled due to the presence of a heavy sheen, and wells KSW-1, KSW-3, KSW-4 and KSW-7 were not sampled because they have not contained detectable hydrocarbons for six or more years. LNAPL recovery was performed on March 31, 2011, with 0.75-gallons of LNAPL and water being collected from KSW-2. On March 31, 2011 wells containing measureable LNAPL were ESMW-A with 0.01-feet, KSW-2 with 0.55-feet and KSW-5 with 0.02-feet. On September 27, 2011 wells containing measureable LNAPL were ESMW-A with 0.01-feet and KSW-2 with 0.25-feet. Monitoring wells KSW-3 and KSW-8 were redeveloped on September 27, 2011 with approximately 6 feet of material removed from KSW-8 and 0.06 feet removed from KSW-3. |
Alyce Hughey |
| 4/19/2013 |
Document, Report, or Work plan Review - other |
Reviewed the 2012 Annual Groundwater Monitoring Report, dated April 8, 2013, prepared by Kent & Sullivan. The 2012 groundwater sampling event was performed on October 16, 2012. Two monitoring wells were sampled in the pig launcher area KSW-3 and KSW-8, with benzene at 0.0104 mg/L, toluene at 0.00414 mg/L, ethylbenzene at 0.285 mg/L, xylenes at 0.299 mg/L, GRO at 1.620 mg/L and DRO at 0.696 mg/L in well KSW-8. Two wells were sampled in the tank farm area KSW-1 and KSW-6, with benzene at 0.00261 mg/L and GRO at 0.392 mg/L in well KSW-6. Wells ESMW-1 and KSW-2 were not sampled due to the presence of LNAPL. Only 0.01 feet of product was observed in these wells; therefore, passive recovery was initiated with absorbent socks being placed in the wells. They are planned to be checked in March of 2013. Well KSW-5 was not sampled due to the presence of a heavy sheen. Well KSW-4 was not sampled because is has not contained detectable hydrocarbons for six or more years, and well KSW-7 was not sampled due to standing water over the well’s flush mount monument. A weighted feeler gauge was inserted in ESMW-A to determine if the well screen material had swollen closed due to long term exposure to LNAPL. The gauge indicated that the screen slots remain open and in working condition. The groundwater levels were higher than any previous event dating back to 1997. The pig launcher area was approximately 10 feet higher than average with the groundwater flow switching from southwest to north. The groundwater levels in the tank farm increased by 2.5 to 3 feet above average, with the groundwater flow direction the same as previous events, towards the northeast. |
Alyce Hughey |
| 11/13/2014 |
Document, Report, or Work plan Review - other |
Reviewed the 2013 Annual Groundwater Monitoring Report, dated October 31, 2014, prepared by Kent & Sullivan. Hilcorp Alaska is now the owner of the facility. The 2013 groundwater sampling event was performed on November 6, 2013. Two monitoring wells were sampled, KSW-8 and KSW-6. KSW-6 had benzene at 0.0171 mg/L, GRO at 0.421 mg/L. Well KSW-8 had benzene at 0.0069 mg/L, ethyl benzene 0.216, xylene 0.09608 and GRO at 1.120 mg/L. LNAPL recovery was not performed as insufficient amounts of product were present. Passive recovery with socks was continued in ESMW-A and KSW-2.
Groundwater levels are higher than any previous sampling event since 1997. This has reversed the flow direction in the pig launcher area from previous years. High groundwater levels submerged the screens in all but two wells.
|
Peter Campbell |
| 3/8/2017 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 71426 tank farm/pig launcher. |
Peter Campbell |
| 9/18/2017 |
Document, Report, or Work plan Review - other |
Electric Shop groundwater wells are monitored on a biennial schedule. All viable wells are gauged during each sampling event. 2017 field activities will include: Replace the LNAPL-absorbent socks in three wells: ESMW-A, KSW-2, and KSW-5. If LNAPL is not observed in the well, sample for GRO, 8260C, PAH and DRO. Sample five wells for 8260C: KSW-1, KSW-3, KSW-4, KSW-6, and KSW-7. Sample well KSW-8 for GRO, PAH and 8260C. Gauge groundwater levels in all monitoring wells within a 24-hour period in order to determine groundwater elevation and flow direction. |
Peter Campbell |
| 11/7/2019 |
Document, Report, or Work plan Review - other |
Reviewed the 2017 Groundwater Monitoring Program Report. Since 2000 product recovery in ESMW-A produced 61.83 gallons of oil and KSW-2 108.75 gallons. Groundwater flow was depicted as moving to the southeast, changed from the northeast, This change in flow direction did not include all of the wells available. |
Peter Campbell |
| 4/30/2020 |
Document, Report, or Work plan Review - other |
Review the 2019 Groundwater Monitoring Program Report. The report was approved. |
Peter Campbell |
| 12/20/2021 |
Document, Report, or Work plan Review - other |
Review 2021 Groundwater Monitoring Program Report. Request product thickness and product recovery be tracked and documented in future reports as a gauge of natural attenuation. Wells KSMW-2, KSW-3 and KSMW-4 are to be decommissioned. KSMW-4 was destroyed and is to be decommissioned. KSMW-5 was damaged. KSW-2 and ESMW-A had free product. KSW-5 did not have free product for the first time. KSW-5 and KSW-8 are the only wells without free product that are impacted above cleanup levels.
|
Peter Campbell |
| 6/1/2023 |
Long Term Monitoring Workplan or Report Review |
Approve 2023 Work Plan Addendum which skips elevation surveying. |
Peter Campbell |
| 3/11/2024 |
Long Term Monitoring Workplan or Report Review |
Review 2023 Groundwater Monitoring Report. Wells ESMW-A, KSW-2, and KSW-5 were not sampled due to product presence. Wells ESMW-2, ESMW-4, and KSW-3 were decommissioned. Well KSW-8 was the only well with ethylbenzene (68.5 ug/L) and naphthalene (2.58 ug/L) above the ADEC Table C.
|
Peter Campbell |
