Site Report: Tesoro - Northstore #52

Site Name:	Tesoro - Northstore #52
Address:	7172 West Parks Highway, Mi 49 Parks Highway, Wasilla, AK 99687
File Number:	2265.26.006
Hazard ID:	23769
Status:	Active
Staff:	Peter Campbell, 9072623412 peter.campbell@alaska.gov
Latitude:	61.582286
Longitude:	-149.630989
Horizontal Datum:	WGS84

We make every effort to ensure the data presented here is accurate based on the best available information currently on file with DEC. It is therefore subject to change as new information becomes available. We recommend contacting the assigned project staff prior to making decisions based on this information.

Site Chronology
IC / Closure Details
Documents
Associated Sites

Problems/Comments

During the removal of two 12,000-gallon gasoline, and one 12,000-gallon diesel underground storage tanks on September 7, 1996, soil and groundwater contamination was encountered. Approximately 240 cubic yards of gasoline and 60 cubic yards of diesel contaminated soil was excavated and treated at Alaska Soil Recycling. A Soil Vapor Extraction System was installed and operated, as treatment technology. Later, an VSC groundwater treatment system was also installed and remains operational. Long-term groundwater monitoring has been established. Updated 2/22/2007.

Action Information

Action Date	Action	Description	DEC Staff
9/24/1996	Site Added to Database		Former Staff
9/24/1996	Update or Other Action	Paul Horwath sent a letter explaining the Waiver from Requirement to use AD101, AK102, or AK103 Analytical Procedures for Hydrocarbon Analyses.	Alyce Hughey
9/24/1996	Update or Other Action	Mike Krieber sent a letter approving the directly excavated soil and haul the contaminated soil to Clean Soils, Inc.	Alyce Hughey
9/24/1996	Leaking Underground Storage Tank Release Confirmed - Petroleum	LUST Site created in CSP for source area ID 77806 ADD; Lead contamination from leaking UST.	Former Staff
9/25/1996	Update or Other Action	Mike Krieber sent a letter approving the transport of contaminated soil to ASR, instead of Clean Soils, based on Clean Soils does not have the capacity to store the soil.	Alyce Hughey
9/25/1996	Leaking Underground Storage Tank Cleanup Initiated - Petroleum	LCAU; Excavation of contaminated soil from a leaking UST.	Former Staff
2/19/1997	Update or Other Action	UPD; Issued a waiver from requirement to use AK 101, AK 102, or AK 103 analytical procedures for hydrocarbon analyses. Waiver # MS-97-001.	Former Staff
2/19/1997	Underground Storage Tank Site Characterization or Assessment	SA1A; Reviewed a UST Closure Site Assessment Report and a Release Investigation Workplan. Based upon the potential for additional release investigation, the RI plan is approved for the concerns of the department. Additional monitoring wells may be needed to define the extent of the plume, if one exists. Prior to installing any other portion of a treatment works, plans prepared and sealed by a P.E. are needed for department review and approval.	Former Staff
3/5/1997	Update or Other Action	Steve Bainbridge sent a letter of the brief synopsis of the site after the annual meeting.	Alyce Hughey
4/22/1997	Release Investigation	Dept completed review and responded to Phase I RI, which showed high levels of diesel contamination under dispensers and gas contamination under the unleaded tank to 36' bgs. GW was also found to be contaminated. Response approved workplan for Phase II RI.	Former Staff
7/31/1997	Update or Other Action	Paul Pinard sent a letter for Mike Krieber after reviewing the Drinking Water Well and Monitor Well Sample Results.	Alyce Hughey
11/20/1997	Update or Other Action	ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: TESORO NORTHSTORE	Former Staff
4/1/1998	Update or Other Action	Dept completed review of workplan for activities in 1998, submitted 2/17/98 and conditionally approved it. May need to amend to include plan for treatment of GW.	Former Staff
4/8/1998	Update or Other Action	Dept completed review and responded to Phase II RI, submitted 12/1/97. GW impacts documented-- primarily by diesel, but some gas.	Former Staff
4/16/1998	Update or Other Action	Dept completed review of SVE system pilot study and system plans, submitted 4/13/98 and issued letter approving plans.	Former Staff
5/13/1998	Long Term Monitoring Established	On May 6,98, the Dept received the Dec 97 Monitoring report. Review was conducted and a letter sent to the consultant on May 13,98. Asked for explanation of why down gradient DW wells were not sampled as planned.	Former Staff
6/24/1998	Update or Other Action	Paul Pinard sent a letter after reviewing the Well Search Report from Gilfilian Engineering, dated June 2, 1998.	Alyce Hughey
7/7/1998	Update or Other Action	Paul Pinard sent a review comments letter after reviewing the April 1998 Monitoring Event.	Alyce Hughey
7/29/1998	Update or Other Action	Paul Pinard sent a letter approving the instalation of 3 new monitoring wells.	Alyce Hughey
11/4/1998	Release Investigation	Paul Pinard sent a letter with review comments and questions after reviewing the Phase III Release Investigation and Aug 1998 Monitoring Event.	Alyce Hughey
11/13/1998	Leaking Underground Storage Tank Corrective Action Underway	Robert Weimer for Paul Pinard sent a letter approving the delay of a corrective action plan until the Nov. Monitoring Event is available and evaluated.	Alyce Hughey
1/28/1999	Update or Other Action	Paul Pinard sent an approval letter for the 1999 Workplan.	Alyce Hughey
3/17/1999	Update or Other Action	Paul Pinard sent a review comments letter after reviewing the November 1998 Monitoring report and the 1998 Annual Report from Gilfilian Engineering, dated February 1, 1999.	Alyce Hughey
4/26/1999	Update or Other Action	Paul Pinard sent a review comments letter after reviewing the February 1999 Monitoring Event from Gilfilian Engineering, dated March 26, 1999.	Alyce Hughey
7/23/1999	Update or Other Action	Robert Weimer for Paul Pinard sent a review comments letter after reviewing the May 1999 Monitoring Event from Gilfilian Engineering, dated June 29, 1999.	Alyce Hughey
10/28/1999	Update or Other Action	Paul Pinard sent a review comments letter after reviewing the August 1999 Monitoring Event Report from Gilfilian Engineering, dated September 29, 1999.	Alyce Hughey
1/14/2004	Release Investigation	Approval for 2004 Work Plan.	Monica English
8/25/2004	Update or Other Action	Conference call with consultant to discuss proposed modifications to the 2004 Work plan.	Monica English
8/30/2004	Update or Other Action	ADEC approval for modifications to the 2004 Work plan. Modifications include installation of a VSC well to the current remediation system.	Monica English
11/3/2004	Document, Report, or Work plan Review - other	April 2004 Monitoring Event report. GW contaminant trends consistent with previous sampling. Monitor wells G1 & VSC exceed GCL for BTEX, and GRO. The SVE/AS remediation system continues to operate.	Monica English
11/15/2004	Update or Other Action	Staff attends annual environmental planning meeting with Tesoro and MWH to discuss potential work plan for 2005.	Monica English
11/18/2004	Document, Report, or Work plan Review - other	Soil Disposal report. Post treatment lanalytical lab results meet soil cleanup levels.	Monica English
11/22/2004	Update or Other Action	File number 2265.26.006 assigned and entered into the Fileroom DB and LUST DB.	Alyce Hughey
2/18/2005	Update or Other Action	ADEC issues approval for the 2005 calendar year Corrective Action plan.	Monica English
11/22/2005	Leaking Underground Storage Tank Corrective Action Underway	Monica English sent an approval letter for the Corrective Action Work Plan for 2006.	Alyce Hughey
10/9/2006	Update or Other Action	Project manager changed from Monica English to Paul Horwath, per Paul Horwath.	Alyce Hughey
1/11/2007	Update or Other Action	Using Figure 2 from the Well Location Map, from Gilfilian Engineering, dated 6/17/98, in conjunction with TopoZone Pro, Mat-Su Real Property, and the Recorders Office, entered the coordinates for this site. Metadata includes, USGS Topo Map 1:24K/25K, TopoZone Pro Street Maps, On a Medium Size Map, View Scale 1:24,000, Coordinate Datum NAD83. High degree of confidence in accuracy of location.	Alyce Hughey
2/8/2007	Document, Report, or Work plan Review - other	Reviewed MWH's July 2006 Monitoring Event Report, dated October 2006. Groundwater treatment at the site is continuing. Petroleum concentrations continue to exceed ADEC cleanup levels along the east side of the site. Petroleum concentrations have decreased since treatment began in the summer of 2004.	Paul Horwath
2/22/2007	Document, Report, or Work plan Review - other	Reviewed MWH's Tesoro 2 Go Mart #52, October 2006 Monitoring Event Report Final, dated January 2007. SVE and VSC treatment systems were not operating when MWH arrived at the site. The VSC wasn't operating at the time of the prior GW sampling event either. Treatment systems were restarted. GW quality improved over the prior GW sampling event. Stable to declining contaminant concentrations in GW since the VSC system was installed in the fall of 2004.	Paul Horwath
4/5/2007	Exposure Tracking Model Ranking	Initial ETM ranking completed.	Paul Horwath
5/22/2007	Leaking Underground Storage Tank Corrective Action Underway	On April 13, 2007, ADEC received Anastasia Wilkinson's April 10, 2007 letter referencing the subject site and supplemental work plan. Enclosed with Anne's letter was a copy of MWH's April 5, 2007 Supplemental Work Plan for Task 3 - Chemical Oxidation Treatment, Tesoro 2 Go Mart #52. This MWH work plan was approved by ADEC staff P.Horwath.	Paul Horwath
10/5/2007	Document, Report, or Work plan Review - other	On June 6, 2007, ADEC received Anastasia Wilkinson's June 4, 2007 letter referencing the subject site and MWH's February 2007 Monitoring Event Report. Enclosed with Anne's letter was a copy of MWH's February 2007 Monitoring Event Report Final report, dated May 2007. This quarterly GW monitoring report indicates that GW contamination increased from the prior sampling event but that groundwater concentrations have clearly declined at this site siten April, 1997. SVE and Vapor Circulation Stripping treatment of soil and groundwater continues at this site.	Paul Horwath
10/31/2007	Update or Other Action	Issue written approval to authorize transport of petroleum contaminated soil to ASR in Anchorage.	Paul Horwath
4/16/2008	Document, Report, or Work plan Review - other	Reviewed the April 2007 Monitoring Event Report Final, dated February 2008, prepared by MWH. Remediation system continues to operate. GW contamination concentrations have lowered over time but still exceed GW cleanup levels along the eastern side of the UST systems. Remediation consists of a 'Vapor Stripping Circulation' GW pumping recirculation system combined with SVE.	Paul Horwath
5/6/2008	Document, Report, or Work plan Review - other	Reviewed MWH's October 2007 Monitoring Event Report Final, dated March 2008. Three monitoring wells and three drinking water wells were sampled. No contamination in the DW wells. Monitoring well G-3 exceeded GW cleanup levels for benzene. SVE and vapor stripping circulation treatment wells continue to operate at this site. GW concentrations have declined since treatment system operation began in 2004. Quarterly GW sampling scheduled for 2008.	Paul Horwath
5/22/2008	Document, Report, or Work plan Review - other	Reviewed MWH's October 2007 Confirmation Soil Borings Report Final, dated April 2008. Ten soil borings were installed to determine soil contaminant concentrations remaining after several years of treatment efforts. Soil contamination exceeding ADEC soil cleanup levels remained in the majority of these 10 soil borings at depth from 13 to 40 feet below ground surface. Soil and groundwater treatment will continue, as will long-term groundwater monitoring.	Paul Horwath
11/5/2008	Document, Report, or Work plan Review - other	Reviewed the February 2008 Monitoring Event Report, the April 2008 Monitoring Event Report, and the August 2008 Monitoring Event Report, all dated September 2008 from MWH for Paul Horwath, and provided him a summary for his review. Site conditions remain stable other than an increase in concentrations in the monitoring well to the east of the underground storage tanks. MWH is planning on investigating into it further during the next monitoring event planned to be conducted during the fourth quarter of 2008.	Alyce Hughey
1/22/2009	Update or Other Action	Reviewed the September/October 2008 Chemical Oxidation Treatment/Monitoring Event Report, dated December 2008, from MWH for Paul Horwath and provided him a summary for his review and oversight. Their has been an increase in concentrations that has been observed in monitoring well G-3 over the last few monitoring events. The monitoring well is located to the east of the existing operating underground storage tanks. Further investigation needs to be performed in future monitoring events in order to determine the cause of the increase in contaminant levels. Contaminant concentrations in all other areas of the site appear to be stable or decreasing. The efficacy of the chemical oxidation on the residual vadose zone contamination will not be known until the conclusion of the first quarter 2009 monitoring event and the completion of the confirmation soil borings scheduled during 2009.	Alyce Hughey
5/7/2009	Document, Report, or Work plan Review - other	Reviewed the February 2009 Monitoring Event Report, dated April 2009, from MWH for Paul Horwath. Monitoring well G-3 has shown a consistent trend in increased hydrocarbon concentrations. Over the course of the past few monitoring events, it also has been noted that a fine sediment with a hydrocarbon odor has been observed in the monitoring well. MWH recommends that the well be re-developed, and with the re-development of the well it is hoped that the sediment build-up will be removed, and it will help in evaluating the cause of the contaminant level increases over the past few sampling events.	Alyce Hughey
8/5/2009	Document, Report, or Work plan Review - other	Reviewed the April 2009 Monitoring Event Report, dated June 2009, from MWH for Paul Horwath. The data collected from the April 2009 groundwater sampling event indicates that hydrocarbon concentrations remain in the groundwater along the east property boundary of the site. MW-3 was redeveloped in March of 2009 in order to increase the production of groundwater for sampling, help remove the dark colored sediment with a slight petroleum odor and heavy sheen, and help evaluate the cause of the contaminant level increases over the past few sampling events.	Alyce Hughey
9/15/2009	Cleanup Plan Approved	Approved the corrective action work in the MWH September 15, 2009 4:04 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
11/27/2009	Document, Report, or Work plan Review - other	Reviewed the July 2009 Monitoring Event Report, dated September 2009, from MWH for Paul Horwath. The data collected from the July 2009 groundwater sampling event indicates that hydrocarbon concentrations does remain in the groundwater along the east property boundary of the site. From the April 2009 to the July 2009 sampling events data indicated that the site conditions are remaining stable. The drinking water well samples from Runion Lots 1 and 2, and Runion Lot 4 indicated that no hydrocarbon contamination does exist within the drinking water wells.	Alyce Hughey
2/5/2010	Document, Report, or Work plan Review - other	Reviewed the November 2009 Monitoring Event Report, dated January 2010, from MWH for Paul Horwath. The data collected to date indicates that hydrocarbon contamination does remain in the groundwater along the east property boundary of the site. The three monitoring wells tested during the November sampling event showed increases in groundwater concentrations with two of the wells tested detecting GRO above the groundwater cleanup levels. The drinking water well samples taken this quarter from Runion Lots 1 and 2, and Runion Lot 4 indicated that no hydrocarbon contamination does exist within the drinking water wells.	Alyce Hughey
5/5/2010	Document, Report, or Work plan Review - other	Contaminated Sites staff reviewed the January 2010 Monitoring Event Report, dated March 2010, from MWH. The groundwater data collected to date indicates that hydrocarbon contamination does still remain in the groundwater along the east property boundary of the site. Drinking water well samples were taken three months early due to Runion Lot 4 drinking water well was brought back online for residential use. Analytical results did not indicated hydrocarbon contamination within the three drinking water wells located near the site.	Alyce Hughey
7/23/2010	Document, Report, or Work plan Review - other	Reviewed the May 2010 Monitoring Event Report, dated July 2010, from MWH for Paul Horwath. The May 27, 2010 groundwater sampling event showed quite a decrease in GRO concentrations in monitoring well G-3, which is located just down-gradient of the potassium permanganate injections that were performed earlier in the year. Also monitoring well G-5 that is located further down-gradient of G-3 also showed a slight decrease in GRO concentrations. Further groundwater monitoring will help in evaluating the effectiveness of the potassium permanganate injections performed at the site.	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
4/8/2011	Document, Report, or Work plan Review - other	Reviewed the August 2010 Monitoring Event Report, dated January 2011, from MWH. For the August 2010 groundwater sampling event, GRO concentrations within the wells tested continue to decrease in concentrations with only one well testing above the groundwater cleanup levels, G-5 detecting GRO at concentrations of 3.27 mg/L. The potassium permanganate chemical oxidation treatments performed during 2010 occurred on January 27th and 28th, June 11th, and August 20th, with a solution of 3 percent potassium permanganate (180, 646, and 767 gallons respectively) was applied to several of the wells.	Alyce Hughey
4/12/2011	Document, Report, or Work plan Review - other	Reviewed the October 2010 Monitoring Event Report, dated January 2011, from MWH. For the October 2010 groundwater sampling event the only monitoring well testing above the groundwater cleanup levels was G-3 with GRO at 3.19 mg/L. On December 8, 2010 a timer was installed on the Vapor Stripping and Circulation system to help enhance the operation of the system. The Soil Vapor Extraction and the Vapor Stripping and Circulation system continue to operate at the facility to treat the remaining subsurface hydrocarbon contamination.	Alyce Hughey
6/21/2011	Document, Report, or Work plan Review - other	Reviewed the February 2011 Monitoring Event Report, dated May 2011, from MWH. During the February 17, 2011 groundwater monitoring event monitoring well G-3 detected DRO at 4.10 mg/L and well G-5 detected GRO at 3.11 mg/L. The remediation system is operating on a full-time basis with a newly installed timer on the Soil Vapor Stripping and Circulation well for the purpose of enhancing the operation of the remediation system.	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
12/16/2011	Document, Report, or Work plan Review - other	Reviewed the June 2011 Monitoring Event Report, dated October 2011, from MWH. During the June 9, 2011 groundwater monitoring event, GRO was detected in monitoring well G-3 at 2.26 mg/L and in monitoring well G-5 at 5.08 mg/L. The drinking water well samples taken from Runion Lot 1 and 2, Runion Lot 4, and Runion Lot 5 detected Bromomethane at 0.00019 mg/L in all three samples, and believed to be a laboratory contaminant because the results are similar in all samples. The remediation system was operating when the site was visited; however, the gauges on both systems were broken and needed to be replaced.	Alyce Hughey
1/25/2012	Document, Report, or Work plan Review - other	Reviewed the September 2011 Monitoring Event Report, dated December 2011, from MWH. During the September 20, 2011 groundwater sampling event all monitoring wells sampled had concentrations below the groundwater cleanup levels for the first time during the course of the groundwater sampling events. The Soil Vapor Extraction System is currently operating on a full-time basis; with the operation of the Vapor Stripping and Circulation System have a net positive effect on treatment of the groundwater at this site.	Alyce Hughey
1/26/2012	Document, Report, or Work plan Review - other	Reviewed the October 2011 Monitoring Event Report, dated January 2012, from MWH. On October 21, 2011 the on-site groundwater monitoring wells were sampled with GRO groundwater contamination returning to one monitoring well just above the groundwater cleanup levels at 2.51 mg/L within monitoring well G-3. The drinking water wells were sample from Runion Lot 1 & 2, Runion Lot 4, and Runion Lot 5, with not analytes being detected in Runion Lot 1 & 2 and Runion Lot 4. The sample taken from Runion Lot 5 detected Chloromethane and Toluene, but the sample results were well below the drinking water standards and the results are considered estimated because the results are less than the reporting limit.	Alyce Hughey
6/4/2012	Document, Report, or Work plan Review - other	Reviewed the February 2012 Monitoring Event Report, dated April 2012, prepared by MWH. During the February 17, 2012 groundwater monitoring event G-3 detected GRO at 2.62 mg/L and G-5 detected GRO at 2.80 mg/L, indicating that the GRO groundwater contamination remains along the east property boundary. The drinking water wells from Runion Lot 1 & 2, Runion Lot 4, and Runion Lot 5, were not sampled during the first quarter 2012 sampling event, and are scheduled to be sampled during the second quarter 2012 sampling event.	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 Supplemental Work Plan for Chemical Oxidation Treatment to be implemented in 2012 for Tesoro Northstore #52.	Alyce Hughey
6/8/2012	Document, Report, or Work plan Review - other	Approved the Supplemental Work Plan for Chemical Oxidation Treatment, dated June 1, 2012, prepared by MWH. Approximately 200 pounds of Klozur CR will be injected into proposed wells (SVE-5, SVE-6 and SVE-1 (G-1) based on the field observations of the wells ability to discharge the mixed oxidant to surrounding groundwater.	Paul Horwath
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 Corrective Action Work Paln for 2013.	Alyce Hughey
12/18/2012	Document, Report, or Work plan Review - other	Reviewed the May 2012 Monitoring Event Report, dated October 2012, prepared by MWH. During the May 17, 2012 groundwater monitoring event G-3 had an increase in GRO concentrations from 2.62 mg/L to 5.91 mg/L and G-5 and a decrease in GRO from 2.80 mg/L to 0.683 mg/L. Drinking water well Runion Lot 1 & 2 and groundwater monitoring well detected DRO at 0.816 mg/L and 0.628 mg/L respectively. Due to the detections in these two wells they were re-sampled on July 18, 2012 with none of the analytes being detected in either well. An updated vertical control survey was performed during this groundwater sampling event. When the soil vapor extraction system was checked on May 9, 2012 it was not operating. When the system was started it was operating within normal limits and is programmed to operate on a full time basis. The vapor stripping and circulation system was operating within normal limits when checked on May 9, 2012.	Alyce Hughey
1/4/2013	Document, Report, or Work plan Review - other	Reviewed the September 2012 Monitoring Event Report, dated November 2012, prepared by MWH. The monitoring event was performed on September 5, 2012, with samples taken from groundwater monitoring wells G-1, G-3, and G-7. Monitoring well G-5 was not sampled because it was buried during recent site improvements. The samples collected from the three wells did not detect any of the analytes above the groundwater cleanup levels. Following the groundwater sampling event, monitoring wells G-4 and G-5 were located and were found in good condition. Monitoring well G-5 will be sampled during the fourth quarter as scheduled. Well G-4 will be sampled during the second quarter in 2013 as scheduled. On September 13, 2012 the Soil Vapor Extraction System was operating with a flow rate of 55 standard cubic feet per minute with 0.2 ppm in the system exhaust, and the Vapor Stripping and Circulation System was operating at 7 pounds per square inch.	Alyce Hughey
4/8/2013	Document, Report, or Work plan Review - other	Reviewed the October 2012 Monitoring Event Report, dated February 2013, prepared by MWH. The groundwater monitoring event was performed on October 30, 2012, with samples taken from wells G-1, G-3, G-5 and G-7. All sample results were non-detect from all four monitoring wells sampled. The water table was higher than normal, and the absence of contaminants is likely from the high water table. The last time a high water table was observed was in October of 2006, and the concentrations were all non-detects other than 1.06 mg/L in G-3, which was lower than historical concentrations at that time. Drinking water wells, Runion Lot 1 and 2, Runion Lot 4 and Runion Lot 5 were sampled on November 12, 2012 with all analytes not being detected in the samples collected. On October 30, November 12 and December 13 a total of 195-gallons of Klozur-CR was injected into the groundwater. 65-gallons was injected each event, with one half into G-1 and the other half being divided between SVE-5 and SVE-6. Following the applications of Klozur-CR, 130-gallons of water was added to G-1 and 65-gallons of water into SVE-5 and SVE-6. On October 30, 2012 the Soil Vapor Extraction System was operating with a flow rate of 55 standard cubic feet per minute with 0.2 ppm in the system exhaust, and the Vapor Stripping and Circulation System was operating at 7 pounds per square inch.	Alyce Hughey
4/26/2013	Document, Report, or Work plan Review - other	Reviewed the 2012 ISCO Technical Memorandum, dated April 9, 2013, prepared by MWH. On October 30, 2012 the application of Klozur CR was injected into three on-site wells G-1, SVE-5 and SVE-6. One part Klozur CR to eight parts water was mixed to produce a 12% slurry (a one 45-pound, 6-gallon pail). Approximately 32.5-gallons was injected into G-1 and 16.3-gallons was injected into SVE-5 and SVE-6. Following the application, 130-gallons of water was injected into G-1 and 65-gallons of water was injected into SVE-5 and SVE-6. Following the injection the wells were sampled again on November 12, 2012 (13 days following the event) and on January 30, 2013 (92 days following the event). Sample results prior to and following the injection, indicated that it is unclear if the treatment reacted with the petroleum contaminants. The concentrations (lack of) were not consistent with historical concentrations, possibly due to the high groundwater elevation due to a large amount of precipitation that occurred earlier in the late fall season. It was however, evident that the chemical oxidant was present in the groundwater with the presence of high sodium levels. It is assumed that the groundwater level will return to normal late 2013. If elevated petroleum contaminant concentrations are detected another round of Klozur CR injection will be implemented later in 2013.	Alyce Hughey
6/13/2013	Exposure Tracking Model Ranking	A new updated ranking with ETM has been completed for source area 77806 UST Systems.	Paul Horwath
6/20/2013	Document, Report, or Work plan Review - other	Reviewed the January 2013 Monitoring Event Report, dated May 2013, from MWH. The groundwater monitoring event was performed on January 30, 2013, with samples taken from wells G-1, G-3, G-5 and G-7. An additional sample was collected on February 15, 2013 from G-7 and a drinking water sample from Runion Lot 4 due to the DRO detection in well G-7 on January 30, 2013. DRO returned to wells G-1, G-3 and G-7, and Toluene, Ethylbenzene and Xylenes returned to G-3, with all analytes below the groundwater cleanup levels. The water table continues to be at levels higher than normal, and the concentrations currently being detected are not believed to be indicative of the groundwater conditions at this site. Drinking water well, Runion Lot 4 was sampled on February 15, 2013 with only Bromomethane (Methyl bromide) detected at 0.00046 mg/L, well below the groundwater cleanup levels. This result is less than the reporting limit but greater than the method detection limit and the concentration was flagged an approximate value. All other analytes were not detected in the Runion Lot 4 sample. On February 15, 2013 the Soil Vapor Extraction System was operating with a flow rate of 50 standard cubic feet per minute with 0.0 ppm in the system exhaust. The Vapor Stripping and Circulation System were not operating and after maintenance work the system was restarted, but due to a faulty gauge a pressure could not be determined. It is planned to be replaced next site visit.	Alyce Hughey
7/16/2013	Document, Report, or Work plan Review - other	Reviewed the May 2013 Monitoring Event Report, dated July 2013, prepared by MWH. The second groundwater monitoring event for 2013 was performed on May 10, 2013, with samples taken from wells G-1, G-2, G-3, G-4, G-5, G-7, and from Runion Lot 1 and 2, Runion Lot 4, and Runion Lot 5. Detectable concentrations are returning to the groundwater monitoring wells after the sampling event conducted in December of 2012 where all wells other than G-7 were non-detect for all analytes. All wells had concentrations below the groundwater cleanup levels. Runion Lot 5 detected DRO at 0.491 mg/L, and was suspected to be laboratory contamination in the preparation batch even though the method blank was clean. The samples were re-extracted and contamination was confirmed. The Soil Vapor Extraction System was operating with a flow rate of 50 standard cubic feet per minute with 0.0 ppm in the system exhaust. The Vapor Stripping and Circulation System were operating within normal parameters with the circulation of groundwater into the discharge well (G-1) at a rate of 3 to 5 gallons per minute (approximately 4,320 to 7,200 gallons per day).	Alyce Hughey
7/30/2013	Meeting or Teleconference Held	Staff attended the mid-year planning meeting at the ADEC office in Soldotna to discuss the current site conditions and future operations of the SVE system to include SVE-2, SVE-3 and SVE-4 in treating the subsurface contamination.	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 proposed Corrective Action Work Plan for 2014, and the planned application of Klozur-CR in December of 2013.	Alyce Hughey
1/8/2014	Document, Report, or Work plan Review - other	Reviewed the October 2013 Monitoring Event Report, dated December 2013, prepared by MWH. The third groundwater monitoring event for 2013 was performed on October 11, 2013, with samples taken from wells G-1, G-3, G-5, and G-7. All groundwater monitoring wells sampled returned to non-detect for all analytes. The Soil Vapor Extraction System was operating with a flow rate of 50 standard cubic feet per minute with 0.0 ppm in the system exhaust. The Vapor Stripping and Circulation System was not operating upon arrival. It was restarted after sampling and was found to over flow the discharge well (G-1). This well is planned to be redeveloped in the 4th quarter of 2013.	Alyce Hughey
1/29/2014	Document, Report, or Work plan Review - other	Reviewed the December 2013 Monitoring Event Report, dated January 2014, prepared by MWH. The fourth groundwater monitoring event for 2013 was performed on December 11, 2013, with samples taken from wells G-1, G-3, G-5, and G-7, and from drinking water wells Runion Lot 1 and 2, Runion Lot 4 and Runion Lot 5. All groundwater monitoring wells sampled remained non-detect for all analytes, and all drinking water wells samples remained non-detect for all analytes. The Soil Vapor Extraction System was operating with a flow rate of 50 standard cubic feet per minute with 0.0 ppm in the system exhaust. The Vapor Stripping and Circulation System was not operating upon arrival. It was restarted after sampling and was found to over flow the discharge well (G-1). This well was redeveloped on December 19, 2013.	Alyce Hughey
4/25/2014	Document, Report, or Work plan Review - other	Reviewed the February 2014 Monitoring Event Report, dated March 2014, prepared by MWH, and the 2013 Chemical Oxidation Technical Memorandum, dated March 28, 2014, prepared by MWH. The first groundwater monitoring event for 2014 was performed on February 19, 2014, with samples taken from wells G-1, G-3, G-5, and G-7. Toluene and xylenes was detected in G-1 and ethylbenzene, xylenes and DRO was detected in G-3 with all analytes testing below the groundwater cleanup levels. The Soil Vapor Extraction System was operating with a flow rate of 60 standard cubic feet per minute with 0.0 ppm in the system exhaust. The Vapor Stripping and Circulation System was not operating upon arrival. It was restarted after sampling and had a pressure of 9.75 pounds per square inch. On December 19, 2013 a round of chemical oxidation was performed. Klozur CR was injected into monitoring well G-1 and remediation wells SVE-5 and SVE-6. The application was conducted by mixing one part Klozur CR to eight parts water to produce a 12% slurry and poured into the wells through a funnel. Each well was injected with one 6-gallon pail (45 pounds) of Klozur that was mixed with 60-gallons of water and poured into each well through a funnel. Following each application each well was then injected with clear water to disperse the oxidant into the groundwater.	Alyce Hughey
7/2/2014	Document, Report, or Work plan Review - other	Reviewed the May 2014 Monitoring Event Report, dated June 2014, prepared by MWH. The second groundwater monitoring event for 2014 was performed on May 1, 2014, with samples taken from wells G-1, G-2, G-3, G-4, G-5, and G-7. DRO was detected in monitoring well G-3 at 3.3 mg/L, exceeding the groundwater cleanup levels for the first time since February of 2011. Drinking water samples were taken from Runion Lots 1 and 2, Runion Lot 4 and Runion Lot 5 with none of the analytes being detected. The Soil Vapor Extraction System was operating with a flow rate of 60 standard cubic feet per minute with 0.0 ppm in the system exhaust. The Vapor Stripping and Circulation System was operating when the site was visited with a pressure of 9.5 pounds per square inch, with an estimated 1-gallon of water per minute or approximately 1,440-gallons per day.	Alyce Hughey
3/12/2015	Update or Other Action	Lat/long collected and verified using CS Internal ArcGIS.com web map, and entered into CS database. 61.582286 -149.630989	Paul Horwath
8/3/2015	Document, Report, or Work plan Review - other	Reviewed MWH's May 2015 Monitoring Event Report, dated July 2015.	Paul Horwath
8/3/2015	Site Characterization Workplan Approved	Approved the July 24, 2015, Supplemental Work Plan for Task 3 Soil Confirmation Borings.	Paul Horwath
1/12/2016	Document, Report, or Work plan Review - other	Review the MWH September 2015 Monitoring Event Report, dated Final - January 2016. Improved GW quality in this September sampling event. The VSC treatment system was not operating when staff arrived on 9/2/2015. GW in MW G-3 met ADEC GW cleanup levels for the first time in 2015.	Paul Horwath
1/22/2016	Document, Report, or Work plan Review - other	Review the MWH October 2015 Confirmation Soil Borings Report, dated Final - December 2015. Soil contaminant concentrations appear to be reduced from the 2007 soil samples collected at the same locations.	Paul Horwath
12/1/2016	Meeting or Teleconference Held	Paul Horwath attended the ADEC/Tesoro Annual projects meeting held at the MWH office in Anchorage to review corrective action work accomplished in 2016, and to discuss the Corrective Action Work Plan for 2017.	Paul Horwath
10/12/2017	Document, Report, or Work plan Review - other	Reviewed the April 2017 groundwater monitoring event report, prepared by MWH/Stantec. 1,2,4- and 1,3,5- Trimethylbenzene, naphthalene, xylenes, and ethylbenzene now exceeding some groundwater cleanup levels, based on the EPA method 8260 laboratory analyses and the November 6, 2016 GW cleanup levels which have been revised lower.	Paul Horwath
12/7/2017	Meeting or Teleconference Held	Meeting with Tesoro's Anne Duarte and Stantec staff at the offices of Stantec in Anchorage. Review work accomplished in 2017, and assessment and cleanup work proposed for 2018.	Paul Horwath
4/18/2018	Document, Report, or Work plan Review - other	Reviewed Stantec's February 2018 GW monitoring event report. Treatment system not running due to equipment breakdown. Will be repaired and restarted. GW conditions looking pretty good, but some persistent contamination remains in GW near the original tanks (USTs).	Paul Horwath
9/9/2019	Document, Report, or Work plan Review - other	Monitoring event was conducted on April 23 and 24, 2019 which included measuring depth to groundwater; water quality parameters; operation of remediation system; and collecting groundwater samples from monitor wells G-1, G-2, G-3, G-4, G-5, G-7, and MW16-2 and RW16-1. Results of the sampling showed petroleum hydrocarbon concentrations exceeded the groundwater cleanup levels for the following monitoring wells G-3: Diesel Range Organics, 1,2,4-Trimethylbenzene, and 1,3,5-Trimethylbenzene. MW16-2 – Gasoline Range Organics, 1,2,4-Trimethylbenzene, and 1,3,5-Trimethylbenzene. Water samples were collected from the domestic water well serving the existing buildings on Lots 1&2, 4, and 5 in Reunion Subdivision, and were analyzed for drinking water analyses and DRO. The drinking water wells were found to have no detectable levels of contaminants. Groundwater flow direction and gradient was noted to be consistent with the historical results. The vapor stripping and circulation remediation system was found to be off due to a power surge. The system was left off until the electrical supply system could be evaluated to determine the cause of the power outages to the compressor.	Peter Campbell
9/20/2019	Document, Report, or Work plan Review - other	Review July 2019 report. Groundwater flow direction is significantly different from historical directions, may be due to frost heave. The remediation system has been restarted and additional 55 pounds of chemical oxidation compound has been added to remediation well RW 16-1.	Peter Campbell
11/25/2019	Document, Report, or Work plan Review - other	Chemox treatment injected into RW 16-1 twice. Install two 4” injection wells.	Peter Campbell
12/12/2019	Meeting or Teleconference Held	Annual meeting to discuss site status and 2020 corrective action plan.	Peter Campbell
12/13/2019	Document, Report, or Work plan Review - other	Review and approve the Corrective Action Work Plan for 2020, which calls for continued groundwater monitoring, maintenance, the installation of two 4" Injection Wells for the injection of Chemox and continued Chemox Treatment at the site.	Peter Campbell
5/19/2020	Document, Report, or Work plan Review - other	Approve Task 3 Work Plan	Peter Campbell
10/27/2020	Update or Other Action	1. Although the first and second quarter groundwater monitoring (GWM) events could not be completed due to Covid, the third and fourth quarter monitoring events were completed. A level survey was completed to measure the current elevations of all of the on-site wells. 2. The air lift pump remediation well system has been maintained and has continued to operate successfully for most of this year. 3. Completed the installation of the 2 proposed 4-inch diameter chemox injection wells. We will prepare a report on the installation of the wells. 4. We plan to inject Klozur One into the two new 4-inch remediation/injection wells. The report on the installation of the new injection wells will include a description of the chemox injection process.	Peter Campbell
12/14/2020	Update or Other Action	Approval to transport two drums of drill cuttings to NRC Alaska for thermal remediation. Nine drums of clean soil cuttings will be transported by GeoTek to Anchorage for storage and future disposal at a Speedway property.	Peter Campbell
12/28/2020	Document, Report, or Work plan Review - other	On October 27, 2020 the installation and development of two 4-inch diameter chemox injection wells, RW 20-1 and RW 20-2 was completed. 55 gallons of chemox was injected into each well.	Peter Campbell
1/27/2021	Document, Report, or Work plan Review - other	Review 3rd Quarter 2020 Report. Well RW-16-1 is the only remaining well impacted by hydrocarbons. This sampling was done prior to the installation of two new remediation wells in 2020.	Peter Campbell
1/29/2021	Document, Report, or Work plan Review - other	Reviewed the 2021 Corrective Action Plan. The remediation system will remain in operation with continued application of Chemical Oxidation Compound to aid in site remediation.	Peter Campbell
2/10/2021	Document, Report, or Work plan Review - other	2021 Corrective Action Plan ADEC Approval	Peter Campbell
5/14/2021	Update or Other Action	Approval to dispose of 9 drums of clean drill cutting on site by land spreading.	Peter Campbell
8/13/2021	Document, Report, or Work plan Review - other	Review March 2021 groundwater monitoring report. RW20-1 and RW20-2 received first Chemox injections. Vapor recovery system running. An ice plug formed in MW G-1 in October 2020, restricting flow.	Peter Campbell
11/1/2021	Document, Report, or Work plan Review - other	3rd Quarter 2021 Analytical sampling showed petroleum contaminants exceeded the groundwater cleanup levels for the following monitoring wells: G-3: DRO, naphthalene, and both species of trimethylbenzene. RW 16-1: Benzene, ethylbenzene, xylenes, GRO, DRO, and both species of trimethylbenzene. In addition, the RDL for naphthalene in all wells was above the GCL. The average groundwater gradient across the site was 0.021 feet per foot to the south-southwest at 207 degrees, consistent with historical data. During this monitoring event, the on-site groundwater remediation system the VSC compressor that operates the air-lift well was not operational due to mechanical failure in one of the fins. The remediation event on July 21st, 2021, consisted of a total chemical oxidation injection of 220 pounds of Klozur into two treatment points (RW 20-1 and RW 20-2).	Peter Campbell
12/2/2021	Document, Report, or Work plan Review - other	Reviewed the 2022 Corrective Action Plan. The remediation system will remain in operation with continued application of Chemical Oxidation Compound to aid in site remediation. RW-16-1 impacted.	Peter Campbell
12/6/2021	Document, Report, or Work plan Review - other	Review and approve October 2021 Annual GWM Event Report.	Peter Campbell
12/7/2021	Meeting or Teleconference Held	2022 Corrective Action Plan meeting	Peter Campbell
12/9/2021	Document, Report, or Work plan Review - other	2022 Corrective Action Plan ADEC Approval Letter	Peter Campbell
12/13/2021	Document, Report, or Work plan Review - other	Review 2Q 2021 Groundwater Monitoring Report.	Peter Campbell
8/10/2022	Update or Other Action	Review 1st Quarter March 2022 Groundwater Monitoring Report. 220 pounds of Klozur added to RW20-1 and RW20-2. Air lift blower in operation.	Peter Campbell
8/30/2022	Document, Report, or Work plan Review - other	Review 2nd Quarter 2022 Report. MW-6 was included in elevation data, changing groundwater flow pattern to the west. RW16-1 is the only well with impacts above groundwater cleanup levels. May 17, 110 lbs. of oxidizer injected into RW20-1 and RW20-2.	Peter Campbell
9/20/2022	Document, Report, or Work plan Review - other	Review 3rd 1/4 2022 Report. No hydrocarbons present in wells that were sampled. Well MW-G-3 was not accessible due to surface water. This well typically has the highest contamination. Heavy rainfall influenced conditions at the site. Water levels were higher.	Peter Campbell
12/1/2022	Long Term Monitoring Workplan or Report Review	Review 20223 CAP. Monitoring well sampling and chemox treatment and air lift system will continue. in 2023, drinking water wells are to be sampled in the 4th quarter.	Peter Campbell
12/5/2022	Long Term Monitoring Workplan or Report Review	Review 4th quarter 2022 Groundwater Monitoring Report. Gradient is shallower than previous events, possibly due to heavy rainfall. The air lift was out of service for two weeks while the compressor was maintained. None of the wells sampled during this event exceeded the groundwater cleanup levels and there has been a clear trend of reduced concentrations. The drinking water wells were sampled and showed no detectable analytes.	Peter Campbell
12/6/2022	Meeting or Teleconference Held	Annual meeting held to discuss accomplishments in 2022 and the 2023 Corrective Action Work Plan.	Peter Campbell
5/22/2023	Long Term Monitoring Workplan or Report Review	Reviewed the March 2023 water sampling report. Of the four wells sampled this quarter, G-5, G-7, RW-16-1 and MW-16-2, only two wells had impacts above groundwater cleanup levels. RW-16-1 had ethylbenzene (0.661 mg/L), xylene (0.531 mg/L), GRO (2.61 mg/L) and DRO (5.76 mg/L), Naphthalene (0.00943 mg/L), 1,2,4 -Trimethylbenzene (2.47 mg/L) and 1,3,5-TMB (0.328 mg/L). MW-16-2 had groundwater results of 1,2,4 -Trimethylbenzene (0.0938 mg/L) and 1,3,5-TMB (0.0664 mg/L).	Peter Campbell
12/7/2023	Long Term Monitoring Workplan or Report Review	2024 Corrective Action Work Plan - ADEC Approval	Peter Campbell
12/7/2023	Meeting or Teleconference Held	Annual meeting for site status held. Review yearly reports and the 2024 work plan. It appears that the Chemox treatment is successful and for the last three quarters of sampling wells have met cleanup levels. This site is close to closure. We may need to consider static monitoring after remediation has been completed to determine if pumping has an effect.	Peter Campbell
12/8/2023	Long Term Monitoring Workplan or Report Review	Review and approve the 4th Q November 2023 Groundwater Monitoring Event Report.	Peter Campbell
2/27/2024	Long Term Monitoring Workplan or Report Review	On April 27th, Stantec conducted a monthly injection of chemox into the remediation wells RW 20-1 and RW 20-2. The event included the injection of two 55-gallon bags of Klozur. The chemox was hydraulically pushed into formation by the injection of an additional 100-200 gallons of water each. All static water levels were measured with the groundwater recirculation system running but not successfully delivering water to well G-1. RW-16-1 has exceedances in Ethylbenzene, Xylene, GRO, DRO and Naphthalene.	Peter Campbell
2/28/2024	Long Term Monitoring Workplan or Report Review	Routine GW Monitoring July 2023. Monthly Chemox Injection. Results of the analytical sampling showed only diesel range organics (DRO) contaminant concentrations in well G-3 and 1,2,4-TMB contaminant concentrations in RW16-1 and the duplicate exceeding the ADEC groundwater cleanup levels (GCLs).	Peter Campbell
5/6/2024	Long Term Monitoring Workplan or Report Review	Review and approve the 1st Quarter March 2024 Groundwater Monitoring Event Report. The water lines from the air-lift well that circulates the water were frozen and were unable to circulate water to wells G-1 and RW20-1. RW16-1 has an interesting pattern of cleaning up at higher groundwater levels above 70 feet in elevation.	Peter Campbell
6/13/2024	Meeting or Teleconference Held	Bi-annual meeting to discuss site status, project details and path forward with consultant and 7-11 representative.	Peter Campbell
12/10/2024	Meeting or Teleconference Held	Biannual meeting with RP and consultant. Site is ready for closure with cleanup levels being met in groundwater monitoring wells.	Peter Campbell
12/12/2024	Document, Report, or Work plan Review - other	2025 corrective action plan approved. Site is ready for closure as wells have met cleanup levels. Remaining monitoring wells are to be sampled during the first and second quarters of 2025.	Peter Campbell

Action Date

Action

Description

DEC Staff

9/24/1996

Site Added to Database

Former Staff

9/24/1996

Update or Other Action

Paul Horwath sent a letter explaining the Waiver from Requirement to use AD101, AK102, or AK103 Analytical Procedures for Hydrocarbon Analyses.

Alyce Hughey

9/24/1996

Update or Other Action

Mike Krieber sent a letter approving the directly excavated soil and haul the contaminated soil to Clean Soils, Inc.

Alyce Hughey

9/24/1996

Leaking Underground Storage Tank Release Confirmed - Petroleum

LUST Site created in CSP for source area ID 77806 ADD; Lead contamination from leaking UST.

Former Staff

9/25/1996

Update or Other Action

Mike Krieber sent a letter approving the transport of contaminated soil to ASR, instead of Clean Soils, based on Clean Soils does not have the capacity to store the soil.

Alyce Hughey

9/25/1996

Leaking Underground Storage Tank Cleanup Initiated - Petroleum

LCAU; Excavation of contaminated soil from a leaking UST.

Former Staff

2/19/1997

Update or Other Action

UPD; Issued a waiver from requirement to use AK 101, AK 102, or AK 103 analytical procedures for hydrocarbon analyses. Waiver # MS-97-001.

Former Staff

2/19/1997

Underground Storage Tank Site Characterization or Assessment

SA1A; Reviewed a UST Closure Site Assessment Report and a Release Investigation Workplan. Based upon the potential for additional release investigation, the RI plan is approved for the concerns of the department. Additional monitoring wells may be needed to define the extent of the plume, if one exists. Prior to installing any other portion of a treatment works, plans prepared and sealed by a P.E. are needed for department review and approval.

Former Staff

3/5/1997

Update or Other Action

Steve Bainbridge sent a letter of the brief synopsis of the site after the annual meeting.

Alyce Hughey

4/22/1997

Release Investigation

Dept completed review and responded to Phase I RI, which showed high levels of diesel contamination under dispensers and gas contamination under the unleaded tank to 36' bgs. GW was also found to be contaminated. Response approved workplan for Phase II RI.

Former Staff

7/31/1997

Update or Other Action

Paul Pinard sent a letter for Mike Krieber after reviewing the Drinking Water Well and Monitor Well Sample Results.

Alyce Hughey

11/20/1997

Update or Other Action

ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: TESORO NORTHSTORE

Former Staff

4/1/1998

Update or Other Action

Dept completed review of workplan for activities in 1998, submitted 2/17/98 and conditionally approved it. May need to amend to include plan for treatment of GW.

Former Staff

4/8/1998

Update or Other Action

Dept completed review and responded to Phase II RI, submitted 12/1/97. GW impacts documented-- primarily by diesel, but some gas.

Former Staff

4/16/1998

Update or Other Action

Dept completed review of SVE system pilot study and system plans, submitted 4/13/98 and issued letter approving plans.

Former Staff

5/13/1998

Long Term Monitoring Established

On May 6,98, the Dept received the Dec 97 Monitoring report. Review was conducted and a letter sent to the consultant on May 13,98. Asked for explanation of why down gradient DW wells were not sampled as planned.

Former Staff

6/24/1998

Update or Other Action

Paul Pinard sent a letter after reviewing the Well Search Report from Gilfilian Engineering, dated June 2, 1998.

Alyce Hughey

7/7/1998

Update or Other Action

Paul Pinard sent a review comments letter after reviewing the April 1998 Monitoring Event.

Alyce Hughey

7/29/1998

Update or Other Action

Paul Pinard sent a letter approving the instalation of 3 new monitoring wells.

Alyce Hughey

11/4/1998

Release Investigation

Paul Pinard sent a letter with review comments and questions after reviewing the Phase III Release Investigation and Aug 1998 Monitoring Event.

Alyce Hughey

11/13/1998

Leaking Underground Storage Tank Corrective Action Underway

Robert Weimer for Paul Pinard sent a letter approving the delay of a corrective action plan until the Nov. Monitoring Event is available and evaluated.

Alyce Hughey

1/28/1999

Update or Other Action

Paul Pinard sent an approval letter for the 1999 Workplan.

Alyce Hughey

3/17/1999

Update or Other Action

Paul Pinard sent a review comments letter after reviewing the November 1998 Monitoring report and the 1998 Annual Report from Gilfilian Engineering, dated February 1, 1999.

Alyce Hughey

4/26/1999

Update or Other Action

Paul Pinard sent a review comments letter after reviewing the February 1999 Monitoring Event from Gilfilian Engineering, dated March 26, 1999.

Alyce Hughey

7/23/1999

Update or Other Action

Robert Weimer for Paul Pinard sent a review comments letter after reviewing the May 1999 Monitoring Event from Gilfilian Engineering, dated June 29, 1999.

Alyce Hughey

10/28/1999

Update or Other Action

Paul Pinard sent a review comments letter after reviewing the August 1999 Monitoring Event Report from Gilfilian Engineering, dated September 29, 1999.

Alyce Hughey

1/14/2004

Release Investigation

Approval for 2004 Work Plan.

Monica English

8/25/2004

Update or Other Action

Conference call with consultant to discuss proposed modifications to the 2004 Work plan.

Monica English

8/30/2004

Update or Other Action

ADEC approval for modifications to the 2004 Work plan. Modifications include installation of a VSC well to the current remediation system.

Monica English

11/3/2004

Document, Report, or Work plan Review - other

April 2004 Monitoring Event report. GW contaminant trends consistent with previous sampling. Monitor wells G1 & VSC exceed GCL for BTEX, and GRO. The SVE/AS remediation system continues to operate.

Monica English

11/15/2004

Update or Other Action

Staff attends annual environmental planning meeting with Tesoro and MWH to discuss potential work plan for 2005.

Monica English

11/18/2004

Document, Report, or Work plan Review - other

Soil Disposal report. Post treatment lanalytical lab results meet soil cleanup levels.

Monica English

11/22/2004

Update or Other Action

File number 2265.26.006 assigned and entered into the Fileroom DB and LUST DB.

Alyce Hughey

2/18/2005

Update or Other Action

ADEC issues approval for the 2005 calendar year Corrective Action plan.

Monica English

11/22/2005

Leaking Underground Storage Tank Corrective Action Underway

Monica English sent an approval letter for the Corrective Action Work Plan for 2006.

Alyce Hughey

10/9/2006

Update or Other Action

Project manager changed from Monica English to Paul Horwath, per Paul Horwath.

Alyce Hughey

1/11/2007

Update or Other Action

Using Figure 2 from the Well Location Map, from Gilfilian Engineering, dated 6/17/98, in conjunction with TopoZone Pro, Mat-Su Real Property, and the Recorders Office, entered the coordinates for this site. Metadata includes, USGS Topo Map 1:24K/25K, TopoZone Pro Street Maps, On a Medium Size Map, View Scale 1:24,000, Coordinate Datum NAD83. High degree of confidence in accuracy of location.

Alyce Hughey

2/8/2007

Document, Report, or Work plan Review - other

Reviewed MWH's July 2006 Monitoring Event Report, dated October 2006. Groundwater treatment at the site is continuing. Petroleum concentrations continue to exceed ADEC cleanup levels along the east side of the site. Petroleum concentrations have decreased since treatment began in the summer of 2004.

Paul Horwath

2/22/2007

Document, Report, or Work plan Review - other

Reviewed MWH's Tesoro 2 Go Mart #52, October 2006 Monitoring Event Report Final, dated January 2007. SVE and VSC treatment systems were not operating when MWH arrived at the site. The VSC wasn't operating at the time of the prior GW sampling event either. Treatment systems were restarted. GW quality improved over the prior GW sampling event. Stable to declining contaminant concentrations in GW since the VSC system was installed in the fall of 2004.

Paul Horwath

4/5/2007

Exposure Tracking Model Ranking

Initial ETM ranking completed.

Paul Horwath

5/22/2007

Leaking Underground Storage Tank Corrective Action Underway

On April 13, 2007, ADEC received Anastasia Wilkinson's April 10, 2007 letter referencing the subject site and supplemental work plan. Enclosed with Anne's letter was a copy of MWH's April 5, 2007 Supplemental Work Plan for Task 3 - Chemical Oxidation Treatment, Tesoro 2 Go Mart #52. This MWH work plan was approved by ADEC staff P.Horwath.

Paul Horwath

10/5/2007

Document, Report, or Work plan Review - other

On June 6, 2007, ADEC received Anastasia Wilkinson's June 4, 2007 letter referencing the subject site and MWH's February 2007 Monitoring Event Report. Enclosed with Anne's letter was a copy of MWH's February 2007 Monitoring Event Report Final report, dated May 2007. This quarterly GW monitoring report indicates that GW contamination increased from the prior sampling event but that groundwater concentrations have clearly declined at this site siten April, 1997. SVE and Vapor Circulation Stripping treatment of soil and groundwater continues at this site.

Paul Horwath

10/31/2007

Update or Other Action

Issue written approval to authorize transport of petroleum contaminated soil to ASR in Anchorage.

Paul Horwath

4/16/2008

Document, Report, or Work plan Review - other

Reviewed the April 2007 Monitoring Event Report Final, dated February 2008, prepared by MWH. Remediation system continues to operate. GW contamination concentrations have lowered over time but still exceed GW cleanup levels along the eastern side of the UST systems. Remediation consists of a 'Vapor Stripping Circulation' GW pumping recirculation system combined with SVE.

Paul Horwath

5/6/2008

Document, Report, or Work plan Review - other

Reviewed MWH's October 2007 Monitoring Event Report Final, dated March 2008. Three monitoring wells and three drinking water wells were sampled. No contamination in the DW wells. Monitoring well G-3 exceeded GW cleanup levels for benzene. SVE and vapor stripping circulation treatment wells continue to operate at this site. GW concentrations have declined since treatment system operation began in 2004. Quarterly GW sampling scheduled for 2008.

Paul Horwath

5/22/2008

Document, Report, or Work plan Review - other

Reviewed MWH's October 2007 Confirmation Soil Borings Report Final, dated April 2008. Ten soil borings were installed to determine soil contaminant concentrations remaining after several years of treatment efforts. Soil contamination exceeding ADEC soil cleanup levels remained in the majority of these 10 soil borings at depth from 13 to 40 feet below ground surface. Soil and groundwater treatment will continue, as will long-term groundwater monitoring.

Paul Horwath

11/5/2008

Document, Report, or Work plan Review - other

Reviewed the February 2008 Monitoring Event Report, the April 2008 Monitoring Event Report, and the August 2008 Monitoring Event Report, all dated September 2008 from MWH for Paul Horwath, and provided him a summary for his review. Site conditions remain stable other than an increase in concentrations in the monitoring well to the east of the underground storage tanks. MWH is planning on investigating into it further during the next monitoring event planned to be conducted during the fourth quarter of 2008.

Alyce Hughey

1/22/2009

Update or Other Action

Reviewed the September/October 2008 Chemical Oxidation Treatment/Monitoring Event Report, dated December 2008, from MWH for Paul Horwath and provided him a summary for his review and oversight. Their has been an increase in concentrations that has been observed in monitoring well G-3 over the last few monitoring events. The monitoring well is located to the east of the existing operating underground storage tanks. Further investigation needs to be performed in future monitoring events in order to determine the cause of the increase in contaminant levels. Contaminant concentrations in all other areas of the site appear to be stable or decreasing. The efficacy of the chemical oxidation on the residual vadose zone contamination will not be known until the conclusion of the first quarter 2009 monitoring event and the completion of the confirmation soil borings scheduled during 2009.

Alyce Hughey

5/7/2009

Document, Report, or Work plan Review - other

Reviewed the February 2009 Monitoring Event Report, dated April 2009, from MWH for Paul Horwath. Monitoring well G-3 has shown a consistent trend in increased hydrocarbon concentrations. Over the course of the past few monitoring events, it also has been noted that a fine sediment with a hydrocarbon odor has been observed in the monitoring well. MWH recommends that the well be re-developed, and with the re-development of the well it is hoped that the sediment build-up will be removed, and it will help in evaluating the cause of the contaminant level increases over the past few sampling events.

Alyce Hughey

8/5/2009

Document, Report, or Work plan Review - other

Reviewed the April 2009 Monitoring Event Report, dated June 2009, from MWH for Paul Horwath. The data collected from the April 2009 groundwater sampling event indicates that hydrocarbon concentrations remain in the groundwater along the east property boundary of the site. MW-3 was redeveloped in March of 2009 in order to increase the production of groundwater for sampling, help remove the dark colored sediment with a slight petroleum odor and heavy sheen, and help evaluate the cause of the contaminant level increases over the past few sampling events.

Alyce Hughey

9/15/2009

Cleanup Plan Approved

Approved the corrective action work in the MWH September 15, 2009 4:04 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

11/27/2009

Document, Report, or Work plan Review - other

Reviewed the July 2009 Monitoring Event Report, dated September 2009, from MWH for Paul Horwath. The data collected from the July 2009 groundwater sampling event indicates that hydrocarbon concentrations does remain in the groundwater along the east property boundary of the site. From the April 2009 to the July 2009 sampling events data indicated that the site conditions are remaining stable. The drinking water well samples from Runion Lots 1 and 2, and Runion Lot 4 indicated that no hydrocarbon contamination does exist within the drinking water wells.

Alyce Hughey

2/5/2010

Document, Report, or Work plan Review - other

Reviewed the November 2009 Monitoring Event Report, dated January 2010, from MWH for Paul Horwath. The data collected to date indicates that hydrocarbon contamination does remain in the groundwater along the east property boundary of the site. The three monitoring wells tested during the November sampling event showed increases in groundwater concentrations with two of the wells tested detecting GRO above the groundwater cleanup levels. The drinking water well samples taken this quarter from Runion Lots 1 and 2, and Runion Lot 4 indicated that no hydrocarbon contamination does exist within the drinking water wells.

Alyce Hughey

5/5/2010

Document, Report, or Work plan Review - other

Contaminated Sites staff reviewed the January 2010 Monitoring Event Report, dated March 2010, from MWH. The groundwater data collected to date indicates that hydrocarbon contamination does still remain in the groundwater along the east property boundary of the site. Drinking water well samples were taken three months early due to Runion Lot 4 drinking water well was brought back online for residential use. Analytical results did not indicated hydrocarbon contamination within the three drinking water wells located near the site.

Alyce Hughey

7/23/2010

Document, Report, or Work plan Review - other

Reviewed the May 2010 Monitoring Event Report, dated July 2010, from MWH for Paul Horwath. The May 27, 2010 groundwater sampling event showed quite a decrease in GRO concentrations in monitoring well G-3, which is located just down-gradient of the potassium permanganate injections that were performed earlier in the year. Also monitoring well G-5 that is located further down-gradient of G-3 also showed a slight decrease in GRO concentrations. Further groundwater monitoring will help in evaluating the effectiveness of the potassium permanganate injections performed at the site.

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

4/8/2011

Document, Report, or Work plan Review - other

Reviewed the August 2010 Monitoring Event Report, dated January 2011, from MWH. For the August 2010 groundwater sampling event, GRO concentrations within the wells tested continue to decrease in concentrations with only one well testing above the groundwater cleanup levels, G-5 detecting GRO at concentrations of 3.27 mg/L. The potassium permanganate chemical oxidation treatments performed during 2010 occurred on January 27th and 28th, June 11th, and August 20th, with a solution of 3 percent potassium permanganate (180, 646, and 767 gallons respectively) was applied to several of the wells.

Alyce Hughey

4/12/2011

Document, Report, or Work plan Review - other

Reviewed the October 2010 Monitoring Event Report, dated January 2011, from MWH. For the October 2010 groundwater sampling event the only monitoring well testing above the groundwater cleanup levels was G-3 with GRO at 3.19 mg/L. On December 8, 2010 a timer was installed on the Vapor Stripping and Circulation system to help enhance the operation of the system. The Soil Vapor Extraction and the Vapor Stripping and Circulation system continue to operate at the facility to treat the remaining subsurface hydrocarbon contamination.

Alyce Hughey

6/21/2011

Document, Report, or Work plan Review - other

Reviewed the February 2011 Monitoring Event Report, dated May 2011, from MWH. During the February 17, 2011 groundwater monitoring event monitoring well G-3 detected DRO at 4.10 mg/L and well G-5 detected GRO at 3.11 mg/L. The remediation system is operating on a full-time basis with a newly installed timer on the Soil Vapor Stripping and Circulation well for the purpose of enhancing the operation of the remediation system.

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

12/16/2011

Document, Report, or Work plan Review - other

Reviewed the June 2011 Monitoring Event Report, dated October 2011, from MWH. During the June 9, 2011 groundwater monitoring event, GRO was detected in monitoring well G-3 at 2.26 mg/L and in monitoring well G-5 at 5.08 mg/L. The drinking water well samples taken from Runion Lot 1 and 2, Runion Lot 4, and Runion Lot 5 detected Bromomethane at 0.00019 mg/L in all three samples, and believed to be a laboratory contaminant because the results are similar in all samples. The remediation system was operating when the site was visited; however, the gauges on both systems were broken and needed to be replaced.

Alyce Hughey

1/25/2012

Document, Report, or Work plan Review - other

Reviewed the September 2011 Monitoring Event Report, dated December 2011, from MWH. During the September 20, 2011 groundwater sampling event all monitoring wells sampled had concentrations below the groundwater cleanup levels for the first time during the course of the groundwater sampling events. The Soil Vapor Extraction System is currently operating on a full-time basis; with the operation of the Vapor Stripping and Circulation System have a net positive effect on treatment of the groundwater at this site.

Alyce Hughey

1/26/2012

Document, Report, or Work plan Review - other

Reviewed the October 2011 Monitoring Event Report, dated January 2012, from MWH. On October 21, 2011 the on-site groundwater monitoring wells were sampled with GRO groundwater contamination returning to one monitoring well just above the groundwater cleanup levels at 2.51 mg/L within monitoring well G-3. The drinking water wells were sample from Runion Lot 1 & 2, Runion Lot 4, and Runion Lot 5, with not analytes being detected in Runion Lot 1 & 2 and Runion Lot 4. The sample taken from Runion Lot 5 detected Chloromethane and Toluene, but the sample results were well below the drinking water standards and the results are considered estimated because the results are less than the reporting limit.

Alyce Hughey

6/4/2012

Document, Report, or Work plan Review - other

Reviewed the February 2012 Monitoring Event Report, dated April 2012, prepared by MWH. During the February 17, 2012 groundwater monitoring event G-3 detected GRO at 2.62 mg/L and G-5 detected GRO at 2.80 mg/L, indicating that the GRO groundwater contamination remains along the east property boundary. The drinking water wells from Runion Lot 1 & 2, Runion Lot 4, and Runion Lot 5, were not sampled during the first quarter 2012 sampling event, and are scheduled to be sampled during the second quarter 2012 sampling event.

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 Supplemental Work Plan for Chemical Oxidation Treatment to be implemented in 2012 for Tesoro Northstore #52.

Alyce Hughey

6/8/2012

Document, Report, or Work plan Review - other

Approved the Supplemental Work Plan for Chemical Oxidation Treatment, dated June 1, 2012, prepared by MWH. Approximately 200 pounds of Klozur CR will be injected into proposed wells (SVE-5, SVE-6 and SVE-1 (G-1) based on the field observations of the wells ability to discharge the mixed oxidant to surrounding groundwater.

Paul Horwath

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 Corrective Action Work Paln for 2013.

Alyce Hughey

12/18/2012

Document, Report, or Work plan Review - other

Reviewed the May 2012 Monitoring Event Report, dated October 2012, prepared by MWH. During the May 17, 2012 groundwater monitoring event G-3 had an increase in GRO concentrations from 2.62 mg/L to 5.91 mg/L and G-5 and a decrease in GRO from 2.80 mg/L to 0.683 mg/L. Drinking water well Runion Lot 1 & 2 and groundwater monitoring well detected DRO at 0.816 mg/L and 0.628 mg/L respectively. Due to the detections in these two wells they were re-sampled on July 18, 2012 with none of the analytes being detected in either well. An updated vertical control survey was performed during this groundwater sampling event. When the soil vapor extraction system was checked on May 9, 2012 it was not operating. When the system was started it was operating within normal limits and is programmed to operate on a full time basis. The vapor stripping and circulation system was operating within normal limits when checked on May 9, 2012.

Alyce Hughey

1/4/2013

Document, Report, or Work plan Review - other

Reviewed the September 2012 Monitoring Event Report, dated November 2012, prepared by MWH. The monitoring event was performed on September 5, 2012, with samples taken from groundwater monitoring wells G-1, G-3, and G-7. Monitoring well G-5 was not sampled because it was buried during recent site improvements. The samples collected from the three wells did not detect any of the analytes above the groundwater cleanup levels. Following the groundwater sampling event, monitoring wells G-4 and G-5 were located and were found in good condition. Monitoring well G-5 will be sampled during the fourth quarter as scheduled. Well G-4 will be sampled during the second quarter in 2013 as scheduled. On September 13, 2012 the Soil Vapor Extraction System was operating with a flow rate of 55 standard cubic feet per minute with 0.2 ppm in the system exhaust, and the Vapor Stripping and Circulation System was operating at 7 pounds per square inch.

Alyce Hughey

4/8/2013

Document, Report, or Work plan Review - other

Reviewed the October 2012 Monitoring Event Report, dated February 2013, prepared by MWH. The groundwater monitoring event was performed on October 30, 2012, with samples taken from wells G-1, G-3, G-5 and G-7. All sample results were non-detect from all four monitoring wells sampled. The water table was higher than normal, and the absence of contaminants is likely from the high water table. The last time a high water table was observed was in October of 2006, and the concentrations were all non-detects other than 1.06 mg/L in G-3, which was lower than historical concentrations at that time. Drinking water wells, Runion Lot 1 and 2, Runion Lot 4 and Runion Lot 5 were sampled on November 12, 2012 with all analytes not being detected in the samples collected. On October 30, November 12 and December 13 a total of 195-gallons of Klozur-CR was injected into the groundwater. 65-gallons was injected each event, with one half into G-1 and the other half being divided between SVE-5 and SVE-6. Following the applications of Klozur-CR, 130-gallons of water was added to G-1 and 65-gallons of water into SVE-5 and SVE-6. On October 30, 2012 the Soil Vapor Extraction System was operating with a flow rate of 55 standard cubic feet per minute with 0.2 ppm in the system exhaust, and the Vapor Stripping and Circulation System was operating at 7 pounds per square inch.

Alyce Hughey

4/26/2013

Document, Report, or Work plan Review - other

Reviewed the 2012 ISCO Technical Memorandum, dated April 9, 2013, prepared by MWH. On October 30, 2012 the application of Klozur CR was injected into three on-site wells G-1, SVE-5 and SVE-6. One part Klozur CR to eight parts water was mixed to produce a 12% slurry (a one 45-pound, 6-gallon pail). Approximately 32.5-gallons was injected into G-1 and 16.3-gallons was injected into SVE-5 and SVE-6. Following the application, 130-gallons of water was injected into G-1 and 65-gallons of water was injected into SVE-5 and SVE-6. Following the injection the wells were sampled again on November 12, 2012 (13 days following the event) and on January 30, 2013 (92 days following the event). Sample results prior to and following the injection, indicated that it is unclear if the treatment reacted with the petroleum contaminants. The concentrations (lack of) were not consistent with historical concentrations, possibly due to the high groundwater elevation due to a large amount of precipitation that occurred earlier in the late fall season. It was however, evident that the chemical oxidant was present in the groundwater with the presence of high sodium levels. It is assumed that the groundwater level will return to normal late 2013. If elevated petroleum contaminant concentrations are detected another round of Klozur CR injection will be implemented later in 2013.

Alyce Hughey

6/13/2013

Exposure Tracking Model Ranking

A new updated ranking with ETM has been completed for source area 77806 UST Systems.

Paul Horwath

6/20/2013

Document, Report, or Work plan Review - other

Reviewed the January 2013 Monitoring Event Report, dated May 2013, from MWH. The groundwater monitoring event was performed on January 30, 2013, with samples taken from wells G-1, G-3, G-5 and G-7. An additional sample was collected on February 15, 2013 from G-7 and a drinking water sample from Runion Lot 4 due to the DRO detection in well G-7 on January 30, 2013. DRO returned to wells G-1, G-3 and G-7, and Toluene, Ethylbenzene and Xylenes returned to G-3, with all analytes below the groundwater cleanup levels. The water table continues to be at levels higher than normal, and the concentrations currently being detected are not believed to be indicative of the groundwater conditions at this site. Drinking water well, Runion Lot 4 was sampled on February 15, 2013 with only Bromomethane (Methyl bromide) detected at 0.00046 mg/L, well below the groundwater cleanup levels. This result is less than the reporting limit but greater than the method detection limit and the concentration was flagged an approximate value. All other analytes were not detected in the Runion Lot 4 sample. On February 15, 2013 the Soil Vapor Extraction System was operating with a flow rate of 50 standard cubic feet per minute with 0.0 ppm in the system exhaust. The Vapor Stripping and Circulation System were not operating and after maintenance work the system was restarted, but due to a faulty gauge a pressure could not be determined. It is planned to be replaced next site visit.

Alyce Hughey

7/16/2013

Document, Report, or Work plan Review - other

Reviewed the May 2013 Monitoring Event Report, dated July 2013, prepared by MWH. The second groundwater monitoring event for 2013 was performed on May 10, 2013, with samples taken from wells G-1, G-2, G-3, G-4, G-5, G-7, and from Runion Lot 1 and 2, Runion Lot 4, and Runion Lot 5. Detectable concentrations are returning to the groundwater monitoring wells after the sampling event conducted in December of 2012 where all wells other than G-7 were non-detect for all analytes. All wells had concentrations below the groundwater cleanup levels. Runion Lot 5 detected DRO at 0.491 mg/L, and was suspected to be laboratory contamination in the preparation batch even though the method blank was clean. The samples were re-extracted and contamination was confirmed. The Soil Vapor Extraction System was operating with a flow rate of 50 standard cubic feet per minute with 0.0 ppm in the system exhaust. The Vapor Stripping and Circulation System were operating within normal parameters with the circulation of groundwater into the discharge well (G-1) at a rate of 3 to 5 gallons per minute (approximately 4,320 to 7,200 gallons per day).

Alyce Hughey

7/30/2013

Meeting or Teleconference Held

Staff attended the mid-year planning meeting at the ADEC office in Soldotna to discuss the current site conditions and future operations of the SVE system to include SVE-2, SVE-3 and SVE-4 in treating the subsurface contamination.

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 proposed Corrective Action Work Plan for 2014, and the planned application of Klozur-CR in December of 2013.

Alyce Hughey

1/8/2014

Document, Report, or Work plan Review - other

Reviewed the October 2013 Monitoring Event Report, dated December 2013, prepared by MWH. The third groundwater monitoring event for 2013 was performed on October 11, 2013, with samples taken from wells G-1, G-3, G-5, and G-7. All groundwater monitoring wells sampled returned to non-detect for all analytes. The Soil Vapor Extraction System was operating with a flow rate of 50 standard cubic feet per minute with 0.0 ppm in the system exhaust. The Vapor Stripping and Circulation System was not operating upon arrival. It was restarted after sampling and was found to over flow the discharge well (G-1). This well is planned to be redeveloped in the 4th quarter of 2013.

Alyce Hughey

1/29/2014

Document, Report, or Work plan Review - other

Reviewed the December 2013 Monitoring Event Report, dated January 2014, prepared by MWH. The fourth groundwater monitoring event for 2013 was performed on December 11, 2013, with samples taken from wells G-1, G-3, G-5, and G-7, and from drinking water wells Runion Lot 1 and 2, Runion Lot 4 and Runion Lot 5. All groundwater monitoring wells sampled remained non-detect for all analytes, and all drinking water wells samples remained non-detect for all analytes. The Soil Vapor Extraction System was operating with a flow rate of 50 standard cubic feet per minute with 0.0 ppm in the system exhaust. The Vapor Stripping and Circulation System was not operating upon arrival. It was restarted after sampling and was found to over flow the discharge well (G-1). This well was redeveloped on December 19, 2013.

Alyce Hughey

4/25/2014

Document, Report, or Work plan Review - other

Reviewed the February 2014 Monitoring Event Report, dated March 2014, prepared by MWH, and the 2013 Chemical Oxidation Technical Memorandum, dated March 28, 2014, prepared by MWH. The first groundwater monitoring event for 2014 was performed on February 19, 2014, with samples taken from wells G-1, G-3, G-5, and G-7. Toluene and xylenes was detected in G-1 and ethylbenzene, xylenes and DRO was detected in G-3 with all analytes testing below the groundwater cleanup levels. The Soil Vapor Extraction System was operating with a flow rate of 60 standard cubic feet per minute with 0.0 ppm in the system exhaust. The Vapor Stripping and Circulation System was not operating upon arrival. It was restarted after sampling and had a pressure of 9.75 pounds per square inch. On December 19, 2013 a round of chemical oxidation was performed. Klozur CR was injected into monitoring well G-1 and remediation wells SVE-5 and SVE-6. The application was conducted by mixing one part Klozur CR to eight parts water to produce a 12% slurry and poured into the wells through a funnel. Each well was injected with one 6-gallon pail (45 pounds) of Klozur that was mixed with 60-gallons of water and poured into each well through a funnel. Following each application each well was then injected with clear water to disperse the oxidant into the groundwater.

Alyce Hughey

7/2/2014

Document, Report, or Work plan Review - other

Reviewed the May 2014 Monitoring Event Report, dated June 2014, prepared by MWH. The second groundwater monitoring event for 2014 was performed on May 1, 2014, with samples taken from wells G-1, G-2, G-3, G-4, G-5, and G-7. DRO was detected in monitoring well G-3 at 3.3 mg/L, exceeding the groundwater cleanup levels for the first time since February of 2011. Drinking water samples were taken from Runion Lots 1 and 2, Runion Lot 4 and Runion Lot 5 with none of the analytes being detected. The Soil Vapor Extraction System was operating with a flow rate of 60 standard cubic feet per minute with 0.0 ppm in the system exhaust. The Vapor Stripping and Circulation System was operating when the site was visited with a pressure of 9.5 pounds per square inch, with an estimated 1-gallon of water per minute or approximately 1,440-gallons per day.

Alyce Hughey

3/12/2015

Update or Other Action

Lat/long collected and verified using CS Internal ArcGIS.com web map, and entered into CS database. 61.582286 -149.630989

Paul Horwath

8/3/2015

Document, Report, or Work plan Review - other

Reviewed MWH's May 2015 Monitoring Event Report, dated July 2015.

Paul Horwath

8/3/2015

Site Characterization Workplan Approved

Approved the July 24, 2015, Supplemental Work Plan for Task 3 Soil Confirmation Borings.

Paul Horwath

1/12/2016

Document, Report, or Work plan Review - other

Review the MWH September 2015 Monitoring Event Report, dated Final - January 2016. Improved GW quality in this September sampling event. The VSC treatment system was not operating when staff arrived on 9/2/2015. GW in MW G-3 met ADEC GW cleanup levels for the first time in 2015.

Paul Horwath

1/22/2016

Document, Report, or Work plan Review - other

Review the MWH October 2015 Confirmation Soil Borings Report, dated Final - December 2015. Soil contaminant concentrations appear to be reduced from the 2007 soil samples collected at the same locations.

Paul Horwath

12/1/2016

Meeting or Teleconference Held

Paul Horwath attended the ADEC/Tesoro Annual projects meeting held at the MWH office in Anchorage to review corrective action work accomplished in 2016, and to discuss the Corrective Action Work Plan for 2017.

Paul Horwath

10/12/2017

Document, Report, or Work plan Review - other

Reviewed the April 2017 groundwater monitoring event report, prepared by MWH/Stantec. 1,2,4- and 1,3,5- Trimethylbenzene, naphthalene, xylenes, and ethylbenzene now exceeding some groundwater cleanup levels, based on the EPA method 8260 laboratory analyses and the November 6, 2016 GW cleanup levels which have been revised lower.

Paul Horwath

12/7/2017

Meeting or Teleconference Held

Meeting with Tesoro's Anne Duarte and Stantec staff at the offices of Stantec in Anchorage. Review work accomplished in 2017, and assessment and cleanup work proposed for 2018.

Paul Horwath

4/18/2018

Document, Report, or Work plan Review - other

Reviewed Stantec's February 2018 GW monitoring event report. Treatment system not running due to equipment breakdown. Will be repaired and restarted. GW conditions looking pretty good, but some persistent contamination remains in GW near the original tanks (USTs).

Paul Horwath

9/9/2019

Document, Report, or Work plan Review - other

Monitoring event was conducted on April 23 and 24, 2019 which included measuring depth to groundwater; water quality parameters; operation of remediation system; and collecting groundwater samples from monitor wells G-1, G-2, G-3, G-4, G-5, G-7, and MW16-2 and RW16-1. Results of the sampling showed petroleum hydrocarbon concentrations exceeded the groundwater cleanup levels for the following monitoring wells G-3: Diesel Range Organics, 1,2,4-Trimethylbenzene, and 1,3,5-Trimethylbenzene. MW16-2 – Gasoline Range Organics, 1,2,4-Trimethylbenzene, and 1,3,5-Trimethylbenzene. Water samples were collected from the domestic water well serving the existing buildings on Lots 1&2, 4, and 5 in Reunion Subdivision, and were analyzed for drinking water analyses and DRO. The drinking water wells were found to have no detectable levels of contaminants. Groundwater flow direction and gradient was noted to be consistent with the historical results. The vapor stripping and circulation remediation system was found to be off due to a power surge. The system was left off until the electrical supply system could be evaluated to determine the cause of the power outages to the compressor.

Peter Campbell

9/20/2019

Document, Report, or Work plan Review - other

Review July 2019 report. Groundwater flow direction is significantly different from historical directions, may be due to frost heave. The remediation system has been restarted and additional 55 pounds of chemical oxidation compound has been added to remediation well RW 16-1.

Peter Campbell

11/25/2019

Document, Report, or Work plan Review - other

Chemox treatment injected into RW 16-1 twice. Install two 4” injection wells.

Peter Campbell

12/12/2019

Meeting or Teleconference Held

Annual meeting to discuss site status and 2020 corrective action plan.

Peter Campbell

12/13/2019

Document, Report, or Work plan Review - other

Review and approve the Corrective Action Work Plan for 2020, which calls for continued groundwater monitoring, maintenance, the installation of two 4" Injection Wells for the injection of Chemox and continued Chemox Treatment at the site.

Peter Campbell

5/19/2020

Document, Report, or Work plan Review - other

Approve Task 3 Work Plan

Peter Campbell

10/27/2020

Update or Other Action

1. Although the first and second quarter groundwater monitoring (GWM) events could not be completed due to Covid, the third and fourth quarter monitoring events were completed. A level survey was completed to measure the current elevations of all of the on-site wells. 2. The air lift pump remediation well system has been maintained and has continued to operate successfully for most of this year. 3. Completed the installation of the 2 proposed 4-inch diameter chemox injection wells. We will prepare a report on the installation of the wells. 4. We plan to inject Klozur One into the two new 4-inch remediation/injection wells. The report on the installation of the new injection wells will include a description of the chemox injection process.

Peter Campbell

12/14/2020

Update or Other Action

Approval to transport two drums of drill cuttings to NRC Alaska for thermal remediation. Nine drums of clean soil cuttings will be transported by GeoTek to Anchorage for storage and future disposal at a Speedway property.

Peter Campbell

12/28/2020

Document, Report, or Work plan Review - other

On October 27, 2020 the installation and development of two 4-inch diameter chemox injection wells, RW 20-1 and RW 20-2 was completed. 55 gallons of chemox was injected into each well.

Peter Campbell

1/27/2021

Document, Report, or Work plan Review - other

Review 3rd Quarter 2020 Report. Well RW-16-1 is the only remaining well impacted by hydrocarbons. This sampling was done prior to the installation of two new remediation wells in 2020.

Peter Campbell

1/29/2021

Document, Report, or Work plan Review - other

Reviewed the 2021 Corrective Action Plan. The remediation system will remain in operation with continued application of Chemical Oxidation Compound to aid in site remediation.

Peter Campbell

2/10/2021

Document, Report, or Work plan Review - other

2021 Corrective Action Plan ADEC Approval

Peter Campbell

5/14/2021

Update or Other Action

Approval to dispose of 9 drums of clean drill cutting on site by land spreading.

Peter Campbell

8/13/2021

Document, Report, or Work plan Review - other

Review March 2021 groundwater monitoring report. RW20-1 and RW20-2 received first Chemox injections. Vapor recovery system running. An ice plug formed in MW G-1 in October 2020, restricting flow.

Peter Campbell

11/1/2021

Document, Report, or Work plan Review - other

3rd Quarter 2021 Analytical sampling showed petroleum contaminants exceeded the groundwater cleanup levels for the following monitoring wells: G-3: DRO, naphthalene, and both species of trimethylbenzene. RW 16-1: Benzene, ethylbenzene, xylenes, GRO, DRO, and both species of trimethylbenzene. In addition, the RDL for naphthalene in all wells was above the GCL. The average groundwater gradient across the site was 0.021 feet per foot to the south-southwest at 207 degrees, consistent with historical data. During this monitoring event, the on-site groundwater remediation system the VSC compressor that operates the air-lift well was not operational due to mechanical failure in one of the fins. The remediation event on July 21st, 2021, consisted of a total chemical oxidation injection of 220 pounds of Klozur into two treatment points (RW 20-1 and RW 20-2).

Peter Campbell

12/2/2021

Document, Report, or Work plan Review - other

Reviewed the 2022 Corrective Action Plan. The remediation system will remain in operation with continued application of Chemical Oxidation Compound to aid in site remediation. RW-16-1 impacted.

Peter Campbell

12/6/2021

Document, Report, or Work plan Review - other

Review and approve October 2021 Annual GWM Event Report.

Peter Campbell

12/7/2021

Meeting or Teleconference Held

2022 Corrective Action Plan meeting

Peter Campbell

12/9/2021

Document, Report, or Work plan Review - other

2022 Corrective Action Plan ADEC Approval Letter

Peter Campbell

12/13/2021

Document, Report, or Work plan Review - other

Review 2Q 2021 Groundwater Monitoring Report.

Peter Campbell

8/10/2022

Update or Other Action

Review 1st Quarter March 2022 Groundwater Monitoring Report. 220 pounds of Klozur added to RW20-1 and RW20-2. Air lift blower in operation.

Peter Campbell

8/30/2022

Document, Report, or Work plan Review - other

Review 2nd Quarter 2022 Report. MW-6 was included in elevation data, changing groundwater flow pattern to the west. RW16-1 is the only well with impacts above groundwater cleanup levels. May 17, 110 lbs. of oxidizer injected into RW20-1 and RW20-2.

Peter Campbell

9/20/2022

Document, Report, or Work plan Review - other

Review 3rd 1/4 2022 Report. No hydrocarbons present in wells that were sampled. Well MW-G-3 was not accessible due to surface water. This well typically has the highest contamination. Heavy rainfall influenced conditions at the site. Water levels were higher.

Peter Campbell

12/1/2022

Long Term Monitoring Workplan or Report Review

Review 20223 CAP. Monitoring well sampling and chemox treatment and air lift system will continue. in 2023, drinking water wells are to be sampled in the 4th quarter.

Peter Campbell

12/5/2022

Long Term Monitoring Workplan or Report Review

Review 4th quarter 2022 Groundwater Monitoring Report. Gradient is shallower than previous events, possibly due to heavy rainfall. The air lift was out of service for two weeks while the compressor was maintained. None of the wells sampled during this event exceeded the groundwater cleanup levels and there has been a clear trend of reduced concentrations. The drinking water wells were sampled and showed no detectable analytes.

Peter Campbell

12/6/2022

Meeting or Teleconference Held

Annual meeting held to discuss accomplishments in 2022 and the 2023 Corrective Action Work Plan.

Peter Campbell

5/22/2023

Long Term Monitoring Workplan or Report Review

Reviewed the March 2023 water sampling report. Of the four wells sampled this quarter, G-5, G-7, RW-16-1 and MW-16-2, only two wells had impacts above groundwater cleanup levels. RW-16-1 had ethylbenzene (0.661 mg/L), xylene (0.531 mg/L), GRO (2.61 mg/L) and DRO (5.76 mg/L), Naphthalene (0.00943 mg/L), 1,2,4 -Trimethylbenzene (2.47 mg/L) and 1,3,5-TMB (0.328 mg/L). MW-16-2 had groundwater results of 1,2,4 -Trimethylbenzene (0.0938 mg/L) and 1,3,5-TMB (0.0664 mg/L).

Peter Campbell

12/7/2023

Long Term Monitoring Workplan or Report Review

2024 Corrective Action Work Plan - ADEC Approval

Peter Campbell

12/7/2023

Meeting or Teleconference Held

Annual meeting for site status held. Review yearly reports and the 2024 work plan. It appears that the Chemox treatment is successful and for the last three quarters of sampling wells have met cleanup levels. This site is close to closure. We may need to consider static monitoring after remediation has been completed to determine if pumping has an effect.

Peter Campbell

12/8/2023

Long Term Monitoring Workplan or Report Review

Review and approve the 4th Q November 2023 Groundwater Monitoring Event Report.

Peter Campbell

2/27/2024

Long Term Monitoring Workplan or Report Review

On April 27th, Stantec conducted a monthly injection of chemox into the remediation wells RW 20-1 and RW 20-2. The event included the injection of two 55-gallon bags of Klozur. The chemox was hydraulically pushed into formation by the injection of an additional 100-200 gallons of water each. All static water levels were measured with the groundwater recirculation system running but not successfully delivering water to well G-1. RW-16-1 has exceedances in Ethylbenzene, Xylene, GRO, DRO and Naphthalene.

Peter Campbell

2/28/2024

Long Term Monitoring Workplan or Report Review

Routine GW Monitoring July 2023. Monthly Chemox Injection. Results of the analytical sampling showed only diesel range organics (DRO) contaminant concentrations in well G-3 and 1,2,4-TMB contaminant concentrations in RW16-1 and the duplicate exceeding the ADEC groundwater cleanup levels (GCLs).

Peter Campbell

5/6/2024

Long Term Monitoring Workplan or Report Review

Review and approve the 1st Quarter March 2024 Groundwater Monitoring Event Report. The water lines from the air-lift well that circulates the water were frozen and were unable to circulate water to wells G-1 and RW20-1. RW16-1 has an interesting pattern of cleaning up at higher groundwater levels above 70 feet in elevation.

Peter Campbell

6/13/2024

Meeting or Teleconference Held

Bi-annual meeting to discuss site status, project details and path forward with consultant and 7-11 representative.

Peter Campbell

12/10/2024

Meeting or Teleconference Held

Biannual meeting with RP and consultant. Site is ready for closure with cleanup levels being met in groundwater monitoring wells.

Peter Campbell

12/12/2024

Document, Report, or Work plan Review - other

2025 corrective action plan approved. Site is ready for closure as wells have met cleanup levels. Remaining monitoring wells are to be sampled during the first and second quarters of 2025.

Peter Campbell

Contaminant Information

Name

Level Description

Media

Comments

Control Type

Type

Details

Requirements

Description

Details

2nd, 3rd and 4th Quarter 2024 Groundwater Monitoring Event Reports - ADEC Report Approval

2025 Corrective Action Work Plan - ADEC Approval

Corrective Action Workplan for 2025

Q4 November 2024 Groundwater Monitoring Report

3Q 2024 GWM TNS 52

2nd Quarter 2024 Groundwater Monitoring Report

ADEC Report Approval - 1st Quarter March 2024 Groundwater Monitoring Report

1st Quarter 2024 Groundwater Monitoring Report

July Q3 Groundwater Monitoring Report

4th Q November 2023 Groundwater Monitoring Event Report ADEC Report Approval

2024 Corrective Action Work Plan - ADEC Approval

2024 Corrective Action Work Plan

4 Quarter November 2023 GWM Event Report

APRIL 2023 2Q GWM Event Report

1st Q March 2023 Groundwater Monitoring Event Report - ADEC Report Approval

1Q 2023 Groundwater Monitoring Report

2023 Corrective Action Work Plan - ADEC Approval

4th Q October 2022 Groundwater Monitoring Event Report ADEC Report Approval Letter

4th Quarter 2022 GWM Event Report

July 2022 3rd Quarter Groundwater Monitoring Event Report - ADEC Report Approval

July 2022 3rd Quarter Groundwater Monitoring Report

May 2022 2nd Quarter Groundwater Monitoring Event Report - ADEC Approval

March 2022 1st Quarter Groundwater Monitoring Event Report ADEC Report Approval

2Q 2022 Groundwater Monitoring Event Report

March 2022 1Q Ground Water Monitoring Event Report

2022 Corrective Action Plan ADEC Approval Letter

Corrective Action Plan 2022

October 2021 GWM Report

3Q July 2021 Groundwater Monitoring Report

2Q 2021 Groundwater Monitoring Report

1st Quarter 2021 Groundwater Monitoring Report

2021 Corrective Action Plan ADEC Approval

2021 Corrective Action Plan

Tech Memo - Installation of two, 4” Diameter Remediation Wells

October 2020 4th Quarter Groundwater Monitoring Event Report

August 2020 3rd Quarter Groundwater Monitoring Event Report

Work Plan for the Installation of 2 Chemox Injection Wells

October 2019 Monitoring Event Report

Corrective Action Work Plan for 2020

No associated sites were found.

Missing Location Data

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Site Report: Tesoro - Northstore #52

Site Chronology

IC / Closure Details

Documents

Associated Sites

Problems/Comments

Action Information

Contaminant Information

Control Type

Requirements

2nd, 3rd and 4th Quarter 2024 Groundwater Monitoring Event Reports - ADEC Report Approval

2025 Corrective Action Work Plan - ADEC Approval

Corrective Action Workplan for 2025

Q4 November 2024 Groundwater Monitoring Report

3Q 2024 GWM TNS 52

2nd Quarter 2024 Groundwater Monitoring Report

ADEC Report Approval - 1st Quarter March 2024 Groundwater Monitoring Report

1st Quarter 2024 Groundwater Monitoring Report

July Q3 Groundwater Monitoring Report

4th Q November 2023 Groundwater Monitoring Event Report ADEC Report Approval

2024 Corrective Action Work Plan - ADEC Approval

2024 Corrective Action Work Plan

4 Quarter November 2023 GWM Event Report

APRIL 2023 2Q GWM Event Report

1st Q March 2023 Groundwater Monitoring Event Report - ADEC Report Approval

1Q 2023 Groundwater Monitoring Report

2023 Corrective Action Work Plan - ADEC Approval

4th Q October 2022 Groundwater Monitoring Event Report ADEC Report Approval Letter

4th Quarter 2022 GWM Event Report

July 2022 3rd Quarter Groundwater Monitoring Event Report - ADEC Report Approval

July 2022 3rd Quarter Groundwater Monitoring Report

May 2022 2nd Quarter Groundwater Monitoring Event Report - ADEC Approval

March 2022 1st Quarter Groundwater Monitoring Event Report ADEC Report Approval

2Q 2022 Groundwater Monitoring Event Report

March 2022 1Q Ground Water Monitoring Event Report

2022 Corrective Action Plan ADEC Approval Letter

Corrective Action Plan 2022

October 2021 GWM Report

3Q July 2021 Groundwater Monitoring Report

2Q 2021 Groundwater Monitoring Report

1st Quarter 2021 Groundwater Monitoring Report

2021 Corrective Action Plan ADEC Approval

2021 Corrective Action Plan

Tech Memo - Installation of two, 4” Diameter Remediation Wells

October 2020 4th Quarter Groundwater Monitoring Event Report

August 2020 3rd Quarter Groundwater Monitoring Event Report

Work Plan for the Installation of 2 Chemox Injection Wells

October 2019 Monitoring Event Report

Corrective Action Work Plan for 2020

Missing Location Data

State of Alaska Department of Environmental Conservation