| Action Date |
Action |
Description |
DEC Staff |
| 5/30/1997 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST Site created in CSP for source area ID 77809 |
Former Staff |
| 5/30/1997 |
Site Added to Database |
|
Former Staff |
| 5/31/1997 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
|
Former Staff |
| 8/19/1997 |
Update or Other Action |
Dept received UST Closure/Site Assessment report. Two 12,000 gasoline and one 6,000 gal diesel tank were closed and removed. Closure work was done during the week of April 14, 97. |
Former Staff |
| 11/5/1997 |
Update or Other Action |
Paul Pinard sent a follow up letter for Mike Krieber after attending the annual meeting to discuss the Tesoro Northstore tank release sites. |
Alyce Hughey |
| 11/7/1997 |
Update or Other Action |
Dept received Phase I Release Investigation report. The RI was conducted in June 97. |
Former Staff |
| 11/20/1997 |
Update or Other Action |
ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: TESORO ALASKA PETROLEUM CO |
Former Staff |
| 1/20/1998 |
Update or Other Action |
Annual meeting with consultant and RP to discuss sites. |
Former Staff |
| 1/30/1998 |
Long Term Monitoring Established |
Dept received Quarterly monitoring report for November 97 event. |
Former Staff |
| 2/17/1998 |
Leaking Underground Storage Tank Corrective Action Underway |
Dept received Workplan for 1998 action at this site. |
Former Staff |
| 2/23/1998 |
Update or Other Action |
Completed review of Closure, Phase I Release Investigation, and Nov Monitoring Reports and sent ltr to consultant & RP. |
Former Staff |
| 3/9/1998 |
Update or Other Action |
Completed review of proposed Workplan for 1998 and issued letter of approval. |
Former Staff |
| 5/4/1998 |
Leaking Underground Storage Tank Corrective Action Underway |
Dept received amended Workplan for Phase II Release Investigation and issued letter of approval (same day). |
Former Staff |
| 11/13/1998 |
Release Investigation |
Paul Pinard sent a review comments letter after reviewing the Phase II Release Investigation Report from Gilfilian Engineering, dated October 20, 1998. |
Alyce Hughey |
| 12/3/1998 |
Update or Other Action |
Paul Pinard sent a letter after reviewing the Well Search Report from Gilfilian Engineering, dated October 30, 1998. |
Alyce Hughey |
| 1/13/1999 |
Update or Other Action |
Paul Pinard sent a letter of response after reviewing the September 1998 Monitoring Event, from Gilfilian Engineering, dated December 29, 1998. |
Alyce Hughey |
| 2/9/1999 |
Update or Other Action |
Paul Pinard sent a conditional approval letter for the proposed 1999 Workplan, from Gilfilian Engineering, dated December 15, 1998. |
Alyce Hughey |
| 4/6/1999 |
Update or Other Action |
Paul Pinard sent a letter addressing the concern of the migration of contamination off site after reviewing the 1998 Annual Monitoring Report, dated February 17, 1999. |
Alyce Hughey |
| 6/25/1999 |
Update or Other Action |
Timothy Stevens sent a letter for Paul Pinard, addressing the concern of the off-site migration of contamination after reviewing the March 1999 Monitoring Event from Gilfilian Engineering, dated May 21, 1999. |
Alyce Hughey |
| 8/30/1999 |
Update or Other Action |
Paul Pinard sent an approval letter for a 1hp blower to be installed to the SVE System. |
Alyce Hughey |
| 9/28/1999 |
Release Investigation |
Received Phase 3 RI - Reviewed 1/27/00. Three wells installed and sampled. Offsite wells were clean. |
Former Staff |
| 12/8/1999 |
Update or Other Action |
Received Historical Monitoring and SVE system monitoring report. SVE system not online due to high water. |
Former Staff |
| 7/25/2003 |
Update or Other Action |
Monica English sent an approval letter for the Remediation Work Plan, Modifications of Existing On-Site Remediation Systems, from Montgomery Watson Harza, dated June 12, 2003. |
Alyce Hughey |
| 1/22/2004 |
Leaking Underground Storage Tank Corrective Action Underway |
Approval for 2004 Work plan. |
Monica English |
| 7/29/2004 |
Update or Other Action |
Conditional approval issued to decommission six monitor wells due to lack of contamination encountered over history of wells. |
Monica English |
| 11/2/2004 |
Update or Other Action |
May 2004 Monitoring Event report. GW contaminant trend consistent with previous sampling. Monitor wells MW14 & MW17 exceed GCL for benzene and/or GRO. The SVE/ASC remediation system continues to operate. |
Monica English |
| 11/2/2004 |
Document, Report, or Work plan Review - other |
January 2004 Monitoring Event report. GW contaminant trends consistent with previous sampling. Monitor wells MW14 & MW17 exceed GCL for benzene, GRO and/or DRO. The SVE/ASC remediation system continues to operate. |
Monica English |
| 11/15/2004 |
Update or Other Action |
Staff attends environmental planning meeting with Tesoro and MWH to discuss workplans for 2005. |
Monica English |
| 11/18/2004 |
Update or Other Action |
File number 2100.26.085 assigned and entered into the Fileroom DB and LUST DB. |
Alyce Hughey |
| 1/25/2005 |
Update or Other Action |
ADEC issues approval for the 2005 calendar year Corrective Action plan. |
Monica English |
| 11/15/2005 |
Update or Other Action |
Annual Environmental Planning meeting attended by ADEC, Tesoro and MWH. |
Monica English |
| 11/17/2005 |
Update or Other Action |
ADEC approval for calendar year 2006 work plan. Groundwater monitoring will be continued to track migration and trends of contaminants present. Operation and maintenance of the remediation system (SVE/VSC) will continue. Soil borings will be installed to assess the effectiveness of the in-situ treatment system. |
Monica English |
| 10/5/2006 |
Leaking Underground Storage Tank Corrective Action Underway |
Monica English sent a conditional approval letter to the Correction of the Workplan for 2006, from Montgomery Watzon Harza, dated May 15, 2006. |
Alyce Hughey |
| 10/9/2006 |
Update or Other Action |
Project manager changed from Monica English to Paul Horwath, per Paul Horwath. |
Alyce Hughey |
| 12/4/2006 |
Update or Other Action |
Using Figrue 1 from the April 2006 Monitoring Event Report, from Mongomery Watson Harza, dated August 2006, in conjunction with TopoZone Pro, Anchorage Live, and the Recorders Office, entered the coordinates for this site. Metadata includes No Topo Basemap, Black and White Aerial Photo, TopoZone Pro Street Maps, on a Medium Size Map, View Scale 1:9,840, Coordinate Datum, NAD83. High degree of confidence in accuracy of location. |
Alyce Hughey |
| 4/6/2007 |
Exposure Tracking Model Ranking |
Initial ETM ranking completed. |
Paul Horwath |
| 4/6/2007 |
Document, Report, or Work plan Review - other |
Reviewed MWH's Former Tesoro Northstore #11, October 2006 Confirmation Soil Borings and Monitoring Event Report Final, dated March 2007. Soil and groundwater contamination remain, but GW conditions improving since treatment was begun in 2003. VSC and SVE soil and groundwater treatment systems continue to operate at this site. It is notes that two of the GW monitoring wells that were sampled are injection wells for the VSC groundwater pump and treat system, therefore the water quality in these MWs, MW-14 and MW-15, are not representative of the site groundwater conditions. These wells will need to be sampled after GW treatment efforts end, to see if there is a rebound in GW contaminant concentrations. |
Paul Horwath |
| 5/24/2007 |
Leaking Underground Storage Tank Corrective Action Underway |
On April 27, 2007, ADEC received Anastasia Wilkinson's April 23, 2007 letter referencing the subject site and supplemental work plan. Enclosed with Anne's letter was a copy of MWH's April 18, 2007 Supplemental Work Plan for Task 3 - Design and Install a Subsurface Soil Treatment System. This MWH work plan was approved via P.Horwath. |
Paul Horwath |
| 9/27/2007 |
Update or Other Action |
ADEC issued approval to transport 330 gallons of petroleum contaminated soil from this site to ASR in Anchorage. Post-treatment analyses required are BTEX, GRO, and DRO. |
Paul Horwath |
| 10/30/2007 |
Update or Other Action |
Provide a written response to ASR's request for a closure letter for contaminated soils received from this site. |
Paul Horwath |
| 12/19/2007 |
Document, Report, or Work plan Review - other |
Reviewed MWH's April 2007 Monitoring Event Report Dated July 2007. GW conditions improved from prior sampling event and improved substantially since treatment began in 2003. All MW samples met ADEC GW cleanup levels during this sampling event. GW gradient much steeper the last two sampling events and MWH needs to resurvey the MW casings to ensure they're getting accurate GW elevations. |
Paul Horwath |
| 4/22/2008 |
Leaking Underground Storage Tank Corrective Action Underway |
Reviewed and approved a Supplemental Work Plan for Task 4 - Install Confirmation Soil Borings, prepared by MWH for this site. The MWH work plan was dated March 25, 2008. |
Paul Horwath |
| 8/28/2008 |
Document, Report, or Work plan Review - other |
Reviewed the October 2007 Monitoring Event and Remediaiton System Upgrade Report, dated May 2008, and provided Paul Horwath with a summary of findings for his review. A slight increase in Benzene, Ethylbenzene, Xylenes and GRO was found during this monitoring event. With the addition of three circulation wells, two rotary vane compressors, a new electrical phase converter, and the use of 10% hydrogen peroxide solution to further enhance remediation efforts, groundwater concentrations should continue to improve. |
Alyce Hughey |
| 10/28/2008 |
Document, Report, or Work plan Review - other |
Reviewed the May 2008 Monitoring Event Report, dated August 2008, from MWH for Paul Horwath and prepared a summary of the review for his review and oversight. Since the previous sampling event done October 25, 2007, hydrocarbon concentrations increased in MW-15 and MW-17 while they decreased in MW-14. Site conditions remain stable with a decrease in hydrocarbon concentrations since starting remediation at the site. The results of the Confirmation Soil Borings scheduled during the third quarter of 2008 will provide evidence of the effectiveness of the chemical oxidation treatment done from February through April 2008. |
Alyce Hughey |
| 12/18/2008 |
Update or Other Action |
Reviewed the October 2008 Monitoring Event Report, dated November 2008, from MWH for Paul Horwath and provided him a summary for his review and oversight. The site conditions are improving, with only MW-15 detecting DRO at concentrations below the groundwater cleanup levels. All other wells tested showed undetected for all the analytes tested for. The Confirmation Soil Borings that were scheduled in 2008 was deferred to 2009 due to the presence of contamination detected in the second quarter groundwater monitoring event. A detailed work plan outlining the additional installation of confirmation soil borings will be prepared and submitted during the first quarter of 2009. |
Alyce Hughey |
| 5/13/2009 |
Document, Report, or Work plan Review - other |
Reviewed the January 2009 Monitoring Event Report, dated April 2009, from MWH for Paul Horwath and prepared a summary for his review and oversight. Site conditions are remaining stable other than an anomalously high DRO groundwater concentration during the January 2009 sampling event performed at the site in one of the wells tested (MW-15). Due to the anomalously high DRO concentrations, MWH performed an additional sampling event almost a month later to confirm the DRO concentrations in MW-15. The DRO concentrations had decreased since the January monitoring event, however, the concentrations were still above the groundwater cleanup levels. Due to the unusually high concentrations of DRO in MW-15, MWH recommends a re-sampling of MW-8, MW-14, and MW-15 during the second quarter of 2009. |
Alyce Hughey |
| 9/15/2009 |
Cleanup Plan Approved |
Approved the corrective action work in the MWH September 15, 2009 4:02 PM e-mail to conduct the application of potassium permanganate within the existing VSC wells on a monthly basis for a 3-month period. The extent of oxidation achieved by the injection of potassium permanganate will be monitored by sampling the wells just prior to injecting the potassium permanganate, sampling one week after the injection, and one month following the last injection. Upon completion of the field work, a comprehensive report will be prepared and submitted to ADEC for documentation. |
Paul Horwath |
| 9/17/2009 |
Document, Report, or Work plan Review - other |
Reviewed the July 2009 Monitoring Event Report, dated August 2009, from MWH for Paul Horwath. Site conditions are remaining stable. Four of the six monitoring wells tested were undetected for all the analytes tested for. One monitoring well detected Ethylbenzene, Xylenes and GRO but remained below the groundwater cleanup levels. One monitoring well detected only DRO above the groundwater cleanup levels. The DRO concentrations have decreased in the well since the anomalously high concentration detected during the January 2009 sampling event performed. |
Alyce Hughey |
| 5/25/2010 |
Document, Report, or Work plan Review - other |
Reviewed the February 2010 Monitoring Event Report, dated March 2010, from MWH for Paul Horwath. The groundwater quality at the site continues to show improvements with only monitoring well MW-15 detecting DRO above the groundwater cleanup levels. MW-15 has shown significant improvement in the groundwater quality since the anomalously high concentrations detected during the January 2009 sampling event. The vapor stripping and circulation system and the vapor extraction system were not operation during part of the first quarter of 2010 due to electrical concerns. The systems were repaired and placed back into operation on February 24, 2010. The vapor extraction system was turned back off on March 3, 2010 due to poor vapor recovery and is currently not operating. |
Alyce Hughey |
| 9/8/2010 |
Document, Report, or Work plan Review - other |
Reviewed the July 2010 Monitoring Event Report, dated August 2010, from MWH. The groundwater quality at the site has improved significantly in monitoring well MW-15, with DRO now undetected in the monitoring well. Potassium permanganate injections were performed on May 13 and July 26, 2010 with a solution of 3 percent potassium permanganate (715 gallons and 600 gallons, respectively) in several of the wells at the site. The combined treatment approach of using the vapor stripping and circulation system at VSC-3 with MW-15 as the receiving well and the potassium permanganate injections appears to be effective. Future groundwater monitoring will help confirm the effectiveness of this treatment approach. |
Alyce Hughey |
| 11/16/2010 |
Meeting or Teleconference Held |
Staff attended the annual environmental planning meeting with Tesoro and MWH to discuss the workplans for 2011. |
Alyce Hughey |
| 11/16/2010 |
Meeting or Teleconference Held |
Staff attended the annual environmental planning meeting with Tesoro and MWH to discuss the workplans for 2011. |
Paul Horwath |
| 4/21/2011 |
Document, Report, or Work plan Review - other |
Reviewed the February 2011 Monitoring Event Report, dated March 2011, from MWH. During the February 2011 groundwater sampling event of the six monitoring wells tested only one well MW-17 detected Benzene slightly above the groundwater cleanup levels, with four of the wells showing non-detects for all the analytes tested for. The vapor stripping and circulation system at VSC-3 continues to operated with MW-15 as the receiving well. The operational VSC well (VSC-3) was configured to be manually alternated between each of the three circulation wells installed at the site. |
Alyce Hughey |
| 12/1/2011 |
Meeting or Teleconference Held |
Staff attended the annual environmental planning meeting with Tesoro and MWH to discuss the workplans for 2012. |
Alyce Hughey |
| 12/1/2011 |
Meeting or Teleconference Held |
Staff attended the annual environmental planning meeting with Tesoro and MWH to discuss the workplans for 2012. |
Paul Horwath |
| 12/6/2011 |
Underground Storage Tank Site Characterization or Assessment |
Reviewed the August 2011 Exploratory Soil Test Holes Report, dated October 17, 2011, from MWH. On August 25, 2011 three test pits were advanced to a depth of 10 feet below ground surface in the vicinity of MW-14 (TP-1), VSC-3 (TP-2), and MW-15 (TP-3). Soil sample analytical results were non-detected for analytes other than Toluene was detected in TP-3 at a concentration of 0.0198 mg/kg. The results of the soil particle size distribution was TP-1 has well graded gravel with silt and sand, TP-2 has poorly graded gravel with sand, and TP-3 has well graded gravel with sand. |
Alyce Hughey |
| 1/4/2012 |
Document, Report, or Work plan Review - other |
Reviewed the September 2011 Monitoring Event Report, dated December 2011, from MWH. The September 21, 2011 groundwater monitoring event sample results did not detect any of the analytes in the monitoring wells sampled. MW-17 was not sampled because it was found dry. The vapor stripping and circulation system was operating at VSC-3 with the VSC system operating to manually alternate between each of the three circulation wells. On October 4, 2011 the remediation system was turned off in preparation of the 2012 rebound test. |
Alyce Hughey |
| 4/17/2012 |
Document, Report, or Work plan Review - other |
Reviewed the February 2012 Monitoring Event Report, dated March 2012, from MWH. During the February 10, 2012 groundwater monitoring event all the on-site and the three off-site down-gradient monitoring wells were sampled. None of the wells detected any of the analytes above the groundwater cleanup levels. The vapor stripping and circulation system was shut off on October 4, 2011, and the vapor extraction system was turned off in March of 2010 due to low extraction rates. After four months of both remediation systems being turned off, only minor rebounding was observed in monitoring wells MW-3, MW-15 and MW-16, with all analytes remaining below the groundwater cleanup levels. |
Alyce Hughey |
| 6/6/2012 |
Meeting or Teleconference Held |
Staff attended the mid-year planning meeting at the ADEC office in Soldotna to discuss the Corrective Action Complete Determination to be issued for the site and the location of the down-gradient drinking water wells. |
Alyce Hughey |
| 6/11/2012 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 77809 Former USTs. |
Alyce Hughey |
| 8/3/2012 |
Cleanup Complete Determination Issued |
Corrective Action Complete Determination issued. The cleanup actions to date have served to adequately remove contaminated soil from this site, and reduce soil and groundwater contaminations. Contamination remains on site above established default soil cleanup levels; however, ADEC has determined there is no unacceptable risk to human health or the environment. The Corrective Action Complete determination was issued with the following conditions: 1. The most current soil sample analytical data reported BTEX, GRO, and DRO contamination exceeding the applicable soil cleanup levels, in the area of the former underground storage tanks, located within the center of the property boundaries. Any proposal to excavate, transport, move, trat, and/or dispose of residual contaminated soil at this site requires prior ADEC approval. 2. Municipal public water service is currently provided to this property. Water wells may not be installed on this property without the prior notification, and approval of ADEC. 3. All groundwater monitoring wells, treatment wells, and subsurface treatment piping associated with this project must now be properly decommissioned in accordance with ADEC's Monitoring Well Guidance. |
Paul Horwath |
| 8/3/2012 |
Long Term Monitoring Complete |
Administrative action on 5/1/2013. |
Kristin Thompson |
| 11/14/2012 |
Meeting or Teleconference Held |
Paul Horwath and Alyce Hughey attended the annual planning meeting at MWH office in Anchorage to discuss the proposed decommissioning work plan to be conducted in 2013. |
Alyce Hughey |
| 7/30/2013 |
Meeting or Teleconference Held |
Staff attended the mid-year planning meeting at the ADEC office in Soldotna to discuss decommissioning work and submittal of decommissioning report. |
Alyce Hughey |
| 8/12/2013 |
Document, Report, or Work plan Review - other |
Reviewed the June 2013 Decommissioning Report, dated August 1, 2013, from MWH. On June 18, 19 and 20, 2013 twelve groundwater monitoring wells (MW-1 through MW-8, MW-14 through MW-17), five soil vapor extraction wells (SVE-1 through SVE-5), three vapor stripping and circulation wells (VSC-1 through VSC-3), and three circulation wells (CW-1 through CW-3) were decommissioned according the ADEC’s Monitoring Well Guidance, dated November 2011. |
Alyce Hughey |
| 12/3/2013 |
Meeting or Teleconference Held |
Paul Horwath and Alyce Hughey attended the annual planning meeting at MWH office in Anchorage to discuss the decommissioning work performed at the site in 2013. |
Alyce Hughey |
| 2/7/2019 |
Update or Other Action |
Public Records Request from Pete Hannon, with Restoration Science and Engineering, Anchorage. |
Paul Horwath |
