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Site Report: Tesoro - Northstore #111

Site Name: Tesoro - Northstore #111
Address: 3679 College Road; , Fairbanks, AK 99701
File Number: 100.26.026
Hazard ID: 24247
Status: Active
Staff: Peter Campbell, 9072623412 peter.campbell@alaska.gov
Latitude: 64.855546
Longitude: -147.812035
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.

Problems/Comments

Petroleum impacted soil and groundwater confirmed at the site in association with a retail fuel storage and sales facility. Groundwater treatment consisting of air sparging and soil vapor extraction was initiated in October 2003 and continues to be operated at this site. Updated 2/8/2007.

Action Information

Action Date Action Description DEC Staff
11/26/1990 Release Investigation SI; Three groundwater monitoring wells were drilled and installed ond one soil boring drilled to evaluate potential for soil and groundwater contamination prior to right-of-way acquisition. Monitoring well MW-1 and Boring B-2 were drilled near underground tanks and soil from MW-1 contained up to 641 ppm total BTEX compounds and 2,650 ppm VPH, quantified as gasoline. Boring B-2 contained 2 ppm total BTEX compounds and 960 ppm VPH, Quanitifed as diesel. TPH for boring B-2 was 1,060 ppm. Former Staff
1/15/1991 Site Added to Database Former Staff
1/15/1991 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77613 ADD; Suspected LUST site. Former Staff
2/26/1991 Release Investigation SA2; Soil analysis from borings & MW's did not exceed stds. for HC contamination. Groundwater analysis of one of three SA2 MW's (MW-5 downgradient of MW-1 from SI contained dissolved HC > drinking water MCL's. MW-8&9 contained low levels TPH, toluene, and/or triclorofluoromethane. Retesting previously installed MW-1&3 showed 1,2 dicloroethane > 5ppb MCL and MW-1 had 90 ppb ethylene dibromide > 0.05 proposed MCL. Both are gas additives. (Dichloroethane is also a solvent) Former Staff
7/11/1991 Update or Other Action UPD; Results of release investigation: potential source areas include existing diesel tanks/piping, product lines feeding the southeastern-most dispensing island, product lines between gasoline UST's & dispensing island. Abandoned UST's and piping may contribute to soil and groundwater conamination > MCL and regulatory levels. Floating product layer is expected to thicken as water table declines. Former Staff
6/5/1992 Release Investigation RELR; Reviewed workplan. Former Staff
9/8/1992 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU; Thomas reported: Large volume of contaminated soils removed during UST closure, and relocated to the Interior Fuels treatment facility for land farming. Former Staff
9/8/1992 Release Investigation SA2; Basketfield: S&W spervised tank closure activities for two 12,000-gal. USTs, one 8,000-gal. UST and one 1,000 gal. HOT. Former Staff
10/16/1992 Release Investigation SA2; Basketfield reviewed monitor well data. Former Staff
2/18/1993 Release Investigation RELR; Basketfield reviewed "S&W UST Closure site Assess." Closure samples: diesel UST, 33-94 ppm: oil UST, 480 ppm: gas USTs 3000 ppm, 226 BTEX. Extremely contaminated site. GW at 22ft, so no H2O samples or sat. soil samples taken. Former Staff
1/14/1994 Update or Other Action RPL2; Peterson sent PRP-CS Database Noitification Letter to RP requesting update and more environmental information concerning the contaminated site. As of this "complete date" no response has been received. Former Staff
6/6/1994 Update or Other Action CORR; Wingerter sent letter informing RP of their financial liability under new ADEC cost recovery policy. State is authorized, under Section 9003(h) of the Resource Conservation and Recovery Act to take action on this LUST facility. Former Staff
8/26/1994 Site Visit RECN; Thomas met with Tesoro rep to inspect soil treatment cell, located at Interior Fuels property. Soils are being actively worked with "Air Knife" and PES solution. Cleanup levels may yet be achieved this fall. Former Staff
1/9/1995 Leaking Underground Storage Tank Corrective Action Underway CAPR; CAP by Gilfilian not accepted until: Tesoro provide all GW data from 1991 to present, results of D&M soil venting pilot tests, and include off site plume contamination in assessment and remedial phases. Former Staff
1/25/1995 Update or Other Action UPD; SITE SUMMARY: LUSTs removed in 1991. Contam. soils removed and insitu soil and ground water remains. Up to 6 MW's installed since 1991. No site data since 1992. In 1995, Gilfilian submitted draft Corrective Action Plan for Tesoro: recommended AS/SVE. DEC responded by requesting the submittal of 1. All GW data from 1992-95; 2. D&M soil vent pilot tests; and 3. inclusion of off-site impact in both the investigation & cleanup phase. CAP should be on-line for summer 1995. DOT is expanded the intersection in the future and should be updated. Former Staff
11/20/1997 Update or Other Action ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: TESORO NORTHSTORE Former Staff
5/27/1999 Underground Storage Tank Site Characterization or Assessment Received UST system Upgrade Site Assessment report. Monica English
8/16/1999 Release Investigation Received Phase III Release Investigation and May 1999 Ground Water Monitoring Event report. Monica English
2/28/2000 Long Term Monitoring Established Received November 1999 Monitoring Event and Historical Trend Summary report. Monica English
9/19/2001 Release Investigation Received May 2001 Release Investigation & Groundwater Monitoring Event report. Monica English
1/31/2002 Long Term Monitoring Established Received December 2001 Monitoring Event report. Monica English
10/30/2002 Long Term Monitoring Established Received August 2002 Monitoring Event report. Monica English
3/26/2004 Release Investigation November 2003 Release Investigation report. Installation of a groundwater monitor well to investigate downgradient soil and groundwater quality. Soil sample collected 13' bgs met SCL. Groundwater sample met GCL. Monica English
6/29/2004 Document, Report, or Work plan Review - other March 2004 Monitoring Event report. Four of the five monitor wells sampled exceeded GCL for benzene, GRO and/or DRO. The results are consistent with previous sampling events. The SVE/AS remediation system continues to operate. Monica English
11/15/2004 Update or Other Action Staff attend annual environmental planning meeting with Tesoro and MWH to discuss proposed workplan for 2005. Monica English
2/22/2005 Update or Other Action ADEC issue approval for the 2005 calendar year Corrective Action work plan. Monica English
10/9/2006 Update or Other Action Project manager changed from Monica English to Paul Horwath, per Paul Horwath. Alyce Hughey
2/8/2007 Exposure Tracking Model Ranking Baseline ETM ranking completed. Paul Horwath
2/8/2007 Document, Report, or Work plan Review - other Reviewed MWH's July 2006 Monitoring Event Report Final dated November 2006. Active groundwater treatment continues at this site. This groundwater samling event shows that petroleum concentrations remain substantially above ADEC GW cleanup levels. Overall, petroleum concentrations have decreased since the initiation of treatment efforts in October 2003. Paul Horwath
10/8/2007 Document, Report, or Work plan Review - other Reviewed MWH's March 2007 Monitoring Event Report Final, dated may 2007. Four MWs and the SVE exhaust were sampled. Tesoro continues to operate an Air Sparge SVE soil and groundwater treatment system at this active fuel sales site. GW concentrations were similar to the prior sampling, but have decreased since the treatment system was installed in October of 2003. Paul Horwath
4/30/2008 Document, Report, or Work plan Review - other Reviewed MWH's october 2007 Monitoring Event Report Final report, dated March 2008. Air sparge and SVE treatment continues at this site. The Air Sparge blower was repaired and placed back into operation. GW contamination remains onsite and GW contamination levels have decreased since active treatment was started in October, 2003. Offsite GW quality does not appear to have been impacted. Treatment and GW monitoring will continue. Paul Horwath
10/30/2008 Document, Report, or Work plan Review - other Reviewed the June 2008 Monitoring Event Report, dated August 2008 from MWH for Paul Horwath. During this monitoring event there was an increase in concentraitons in MW-10 and G-1, and a decrease in G-5 and MW-16. This is consistant with past monitoring events. The air sparge remediation system appears to be effective. Future groundwater monitoring needs to continue in order to evaluate the effectiveness of the remediation treatment and to confirm that contaminant migration is not occurring. Alyce Hughey
12/11/2008 Update or Other Action Reviewed the September 2008 Monitoring Event Report, dated November 2008, from MWH for Paul Horwath. Site conditions are improving, and it is anticipated that the groundwater quality will continue to improve with the operation of the replacement Air Sparge Compressor installed on May 18, 2007. Alyce Hughey
6/4/2009 Update or Other Action Reviewed the February 2009 Monitoring Event Report, dated May 2009, from MWH for Paul Horwath and prepared a summary for his review and oversight. The groundwater contaminant concentrations are continuing to show an overall decreasing trend at this site, although the groundwater contamination in Monitoring Wells G-1 and MW-10 did increase following the remediation system being shut down for convenience store renovation in the weeks prior to the monitoring event. The treatment systems were turned back on after the February monitoring event and are currently running 24 hours a day. Alyce Hughey
12/11/2009 Document, Report, or Work plan Review - other Reviewed the July 2009 Monitoring Event Report, dated October 2009, from MWH for Paul Horwath. The groundwater concentrations showed some minor variances from the February 2009 sampling event to the July 2009 sampling event, with no significant change. The Soil Vapor Extraction System and Air Sparging System will continue to operate 24 hours a day to treat the residual soil and groundwater contamination at the site. Alyce Hughey
7/6/2010 Document, Report, or Work plan Review - other Reviewed the results for an additional sampling event for Sulfolane, conducted on June 15th and 16th, 2010 from MW-10 located on the site. Sample results are non-detect for Sulfolane from MW-10. Alyce Hughey
10/5/2010 Document, Report, or Work plan Review - other Approved the July 14, 2010 Supplemental Work Plan for Chemical Oxidation Treatment, from MWH. Paul Horwath
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
12/30/2010 Document, Report, or Work plan Review - other Reviewed the September 2010 Monitoring Event Report, dated November 2010, from MWH for Paul Horwath. The groundwater concentrations have shown some variance in concentrations during the 2010 sampling events. The air sparge and soil vapor extractions systems continue to operate at the facility to remediate the remaining contamination at the site. The groundwater flow direction was flowing in a northeasterly flow direction, which is not consistent with previous monitoring events. Due to the variation of groundwater flow, it has been proposed that the wells be re-surveyed in 2011. Alyce Hughey
4/7/2011 Document, Report, or Work plan Review - other Reviewed the March 2010 Monitoring Event Report, dated January 2011, from MWH. During the March 2010 groundwater monitoring event GRO was detected in one of the monitoring wells at 92 mg/L. 1,2-Dichloroethane (1,2-DCA) and Ethylene Dibromide (EDB) were sampled in the monitoring wells with sample results of EDB at 0.000015 mg/L, and 1,2-DCA at 0.0015 mg/L. The Soil Vapor Extraction System and Air Sparging System is operating 24 hours a day to treat the residual soil and groundwater contamination at the site. Alyce Hughey
6/24/2011 Document, Report, or Work plan Review - other Reviewed the March 2011 Monitoring Event Report, dated June 2011, from MWH. During the March 2, 2011 groundwater sampling event only MW-10 and MW-16 showed concentrations above the groundwater cleanup levels, with GRO at 16.0 mg/L and DRO at 2.82 mg/L and 17.4 mg/L. The air sparge and soil vapor extractions systems continue to operate at the facility to remediate the remaining contamination at the site, with the air sparge targeted at wells AS-9, AS-10, AS-12 and AS-14. The groundwater flow direction showed an anomalous flow direction again during the March monitoring event, and the wells are planned to be re-surveyed in 2011. Alyce Hughey
11/22/2011 Document, Report, or Work plan Review - other Reviewed the September 2011 Monitoring Event Report, dated October 2011, from MWH. During the September1, 2011 groundwater sampling event only MW-10 and MW-16 showed concentrations above the groundwater cleanup levels. MW-10 detected benzene at 0.00550 mg/L, GRO at 21.5 mg/L and DRO at 28.3 mg/L. MW-16 detected DRO at 2.38 mg/L. The air sparge and soil vapor extractions systems continue to operate at the facility to remediate the remaining contamination at the site, with the air sparge targeted at wells AS-9, AS-10, AS-12 and AS-14. The groundwater flow direction was flowing towards the west, which is similar from previous events. 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
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 and tank replacement to be conducted in 2012 at Tesoro Northstore #111. Alyce Hughey
6/8/2012 Document, Report, or Work plan Review - other Issued approval for the implementation of the Supplemental Work Plan for Chemical Oxidation Treatment for the site. This work plan was dated June 1, 2012, and was prepared by MWH on behalf of Tesoro Refining and Marketing Company. On June 6, 2012, we received an e-mail message with the supplemental to the work plan, clarifying that up to 90 pounds of Klozur CR would be injected beginning the week of June 11, 2012. Paul Horwath
6/15/2012 Offsite Soil or Groundwater Disposal Approved Authorized the transport of petroleum contaminated soils to OIT, should contaminated soils be encountered during the regulated tank system upgrading activities being conducted in June of 2012. Paul Horwath
6/19/2012 Document, Report, or Work plan Review - other Reviewed the March 2012 Monitoring Event Report, dated May 2012, from MWH. During the March 13, 2012 groundwater sampling event three wells tested above the groundwater cleanup levels MW-10, MW-16 and G-5. MW-10 detected GRO at 4.2 mg/L and DRO at 10.3 mg/L. MW-16 detected DRO at 4.18 mg/L, and G-5 detected benzene at 0.0307 mg/L and GRO at 3.63 mg/L. The air sparge and soil vapor extractions systems continue to operate at the facility to remediate the remaining contamination at the site. The air sparge system was operating at 7.5 pounds per square inch, and the soil vapor extraction system was running at a flow rate of 115 standard cubic feet per minute with field instrumentation indicating 75 ppm volatile organics in the system effluent. The groundwater flow direction was seen flowing at a southerly flow direction, which is not consistent with previous events. The wells are planned to be re-surveyed during the third quarter of 2012. Alyce Hughey
9/18/2012 Site Characterization Workplan Approved Paul Horwath approved the September 18, 2012 Supplemental Work Plan for Installation of Exploratory Soil Test Borings, prepared by MWH. Four exploratory soil test borings will be drilled on site to further delineate and characterize the residual petroleum contamination that may remain on site. Subject to the findings of the soil conditions, the borings may be used for the installation of groundwater monitoring wells and/or remediation wells. Alyce Hughey
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 chemical oxidation treatment, UST removal and installation, assessment, and release investigation conducted in 2012 and the Corrective Action Work Plan for 2013. Alyce Hughey
12/6/2012 Document, Report, or Work plan Review - other Reviewed the 2012 Chemical Oxidation Technical Memorandum, dated September 21, 2012, prepared by MWH. On June 13, 2012 one 45 pound container of Klozur CR was mixed with 8 parts water to produce a 12% slurry and injected into AS-9 and MW-10. Two-gallons was injected into AS-9; however, the solution clogged the well limiting the amount that could be injected. After obtaining phone approval from ADEC thirty-gallons was injected into MW-10. After the injection into MW-10, as a precautionary effort, 100-gallons of clear water was injected into MW-10 to dilute and flush the oxidant into the groundwater formation. In addition the well was sparged with compressed air for 30 to 60 minutes to further enhance the movement of the chemical oxidant. Groundwater samples collected following the application on July 23, 2012 showed significant reductions in GRO, DRO, and BTEX in monitoring wells MW-10 and G-5. Alyce Hughey
12/13/2012 Underground Storage Tank Site Characterization or Assessment Reviewed the June 2012 UST Closure Site Assessment Report, dated September 2012, prepared by MWH. On June 14th through the 16th of 2012, two 10,000-gallon gasoline and one 10,000-gallon diesel underground storage tanks were removed and replaced with two multi-compartment 15,000-gallon underground storage tanks (one compartment 15,000-gallon gasoline and one-two compartment 8,000-gallon diesel and 7,000-gallon gasoline tanks). An abandoned septic tank was encountered during the expansion of the excavation with no hydrocarbons detected during field screening. The soil deeper than 12 feet below ground surface had a petroleum odor, and saturated soil was observed within a couple feet below the soil samples collected at 13 feet below ground surface. A total of 41.87 tons of petroleum contaminated soil was transported to OIT, Inc. for thermal remediation. Six soil samples were collected from the former USTs location and three samples were collected from the former abandoned septic tank area. Soil samples collected from the former USTs had Benzene at 0.0394 to 2.36 mg/kg, Toluene at 31.5 mg/kg, Ethylbenzene at 7.03 mg/kg, Xylenes at 130 to 254 mg/kg, and GRO at 340 to 624 mg/kg at 13 feet below ground surface. Soil samples collected from the former septic tank had Benzene at 0.434 mg/kg, Toluene at 8.05 mg/kg, Ethylbenzene at 10.6 mg/kg, Xylenes at 190 mg/kg and GRO at 733 mg/kg at 13 feet below ground surface. Soil samples were also collected and analyzed for PAH’s and sample results did not detect PAH’s above the soil cleanup levels. Following the removal, horizontal slotted pipe was placed along the eastern edge and southern ends of the new 15,000-gallon USTs and four manholes and vertical access pipes were installed at the ends of the slotted pipe for future in-situ remediation. Alyce Hughey
12/17/2012 Document, Report, or Work plan Review - other Reviewed the July 2012 Monitoring Event Report, dated October 2012, prepared by MWH. The second semi-annual and one month follow-up of the Klozur CR injection groundwater sampling event was conducted on July 23, 2012. Wells sampled were G-1, G-5, MW-10 and MW-16. A significant decrease in hydrocarbon concentrations was seen in MW-10, MW-16 and G-5 following the application of Klozur CR on June 13, 2012. The only wells detecting concentrations above the groundwater cleanup levels was MW-10 with DRO at 3.02 mg/L and G-1 with Benzene at 0.0134 mg/L. A current vertical control survey was performed on July 23, 2012 for all site monitoring wells. When the remediation systems were checked on July 25, 2012, the Air Sparge System was not operating. It was noted that the vanes should be checked during the next site visit. Alyce Hughey
1/28/2013 Document, Report, or Work plan Review - other Reviewed the September 2012 Release Investigation Report, dated December 2012, from MWH. On September 26 and September 27 four soil borings (three around the USTs in the northern portion of the site and one along the west edge of the site) were advanced and three soil samples were collected from each soil boring. Three groundwater monitoring wells and one air lift well was installed in the four soil borings that were advanced. The soil boring advanced along the west edge of the site contained DRO at 549 mg/kg at 15 feet bgs and Benzene at 0.0510 mg/kg at 24 feet bgs. The soil boring advanced on the northern portion of the property line on the east side of the USTS contained Toluene at 89.7 mg/kg, Ethylbenzene at 40.9 mg/kg Xylenes at 201 mg/kg and GRO at 2,660 mg/kg at 19 feet bgs. The soil boring advanced on the northern side of the dispenser island contained DRO at 528 mg/kg at 15 feet bgs and Toluene at 28.8 mg/kg, Ethylbenzene at 32.5 mg/kg, Xylenes at 152 mg/kg, GRO at 1,070 mg/kg and DRO at 1,820 mg/kg at 19 feet bgs. Groundwater samples were collected from the new monitoring wells (MW-11, MW-12, and MW-13) on September 28, 2012, and from the new remediation well (RM-1) on October 10, 2012. Groundwater sample results exceeding the groundwater cleanup levels detected Benzene at 0.0425 to 0.235 mg/L, Toluene at 13.9 to 15.4 mg/L, Ethylbenzene at 3.08 to 3.51 mg/L, Xylenes at 16.7 to 19.5 mg/L, GRO at 8.11 to 175 mg/L, and DRO at 2.74 to 19.4 mg/L. Alyce Hughey
5/6/2013 Document, Report, or Work plan Review - other Paul Horwath approved the March 29, 2013 Supplemental Work Plan for 2013 Chemical Oxidation Treatment. The process will be to extract the contaminated groundwater from RM-1, pump through a 1 ½-inch pipe and inject into MW-12. Applications of 200-gallon batches at a concentration of 12% solution of Klozur CR will be injected into MW-12 once every three months during the non-freezing temperature time of year until the effectiveness of the treatment is determined. Alyce Hughey
6/5/2013 Document, Report, or Work plan Review - other Reviewed the February 2013 Monitoring Event Report, dated May 2013, prepared by MWH. The first semi-annual groundwater sampling event for 2013 was conducted on February 21, 2013. Wells sampled were G-1, MW-10, MW-11, MW-12, MW-13, MW-16 and RM-1. Monitoring well G-5 could not be located; therefore not sampled. Groundwater concentrations were GRO at 2.69 to 71.1 mg/L, DRO at 1.90 to 10.7 mg/L, Benzene at 0.012 to 0.0251 mg/L, Toluene at 7.25 to 7.69 mg/L, Ethylbenzene at 1.61 to 2.69 and Xylenes at 11.3 to 12.8 mg/L. MW-10 and MW-11 had elevated sodium levels, indicative of the pervasiveness of the Klozur CR and the expected long-term site treatment. An updated vertical control survey was performed on October 10, 2012. When the remediation systems were checked on February 22, 2013, the air sparge compressor was not operating, and it was determined that it would need to be either repaired or replaced. The Soil Vapor Extraction system was operating within normal parameters. Alyce Hughey
6/5/2013 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77613 UST Source 1. 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 site conditions and the work plan that will be submitted for the proposed treatment option for treating the residual soil and groundwater contamination. Alyce Hughey
10/9/2013 Document, Report, or Work plan Review - other Reviewed the August 2013 Monitoring Event Report, dated September 2013, prepared by MWH. The second semi-annual groundwater sampling event for 2013 was conducted on August 13, 2013. Wells sampled were G-1, G-5, MW-10, MW-11, MW-12, MW-13, MW-16 and RM-1. Groundwater concentrations exceeding ADEC groundwater cleanup levels were GRO at 5.45 to 39.9 mg/L, DRO at 3.61 to 10.3 mg/L, Benzene at 0.00621 to 0.257 mg/L, Toluene at 7.30 to 12.2 mg/L, Ethylbenzene at 1.00 to 1.80 and Xylenes at 10.4 mg/L. MW-12, MW-13 and RM-1 were sampled for sodium levels, with sample results showing elevated sodium levels, indicating the presence of the Klozur CR. When the remediation systems were checked on August 13, 2013, the air sparge compressor was not operating, and it was determined that it would need to be either repaired or replaced. The Soil Vapor Extraction system was operating within normal parameters. Alyce Hughey
12/3/2013 Meeting or Teleconference Held Paul Horwath and Alyce Hughey attended the ADEC/Tesoro Annual planning meeting held at the MWH office In Anchorage to discuss the Corrective Action Plan for 2014, the application of Chem-ox and the remediation system upgrades. Alyce Hughey
2/24/2014 Document, Report, or Work plan Review - other Reviewed the 2013 Chemical Oxidation Technical Memorandum, dated January 31, 2014, prepared by MWH. On August 14, 2013 and September 26, 2013 two rounds of chemical oxidation applications of Klozur CR was injected into one on-site well, MW-12. Each application consisted of a 12% slurry (1 part Klozur CR to 8 parts water), and poured directly into MW-12 through a funnel. A total of 100-gallons of the 12% slurry was injected into MW-12 at each application for a total of 200-gallons. Following the application of Klozur CR, 300-gallons of clear water was pumped from RM-1 into MW-12 on August 14, 2013 and 400-gallons on September 26, 2013 for the purpose of flushing the chemical into the groundwater formation. Following the application of two rounds of Klozur CR a decrease in concentrations was observed in all analytes other than DRO. It is thought that the increase in DRO concentrations is likely due to the use of water from RM-1 being pumped into MW-12 as both a chemical oxidant solution and as a rinse water to flush the oxidant into the formation. Alyce Hughey
6/2/2014 Document, Report, or Work plan Review - other Reviewed the March 2014 Monitoring Event Report, dated May 2014, prepared by MWH. The first semi-annual groundwater sampling event for 2014 was conducted on March 18th and 19th of 2014. Wells sampled were G-1, G-5, MW-10, MW-11, MW-12, MW-13, MW-16 and RM-1. Groundwater concentrations exceeding ADEC groundwater cleanup levels were GRO at 2.44 to 27.9 mg/L, DRO at 3.17 to 14.1 mg/L, Benzene at 0.0128 to 0.0933 mg/L, and Toluene at 2.24 mg/L. Groundwater was encountered at depths ranging from 14.90 to 16.12 feet. The groundwater was flowing towards the southwest with a bearing of 227 degrees with a gradient of 0.00105, which is consistent with historical findings. When the remediation systems were checked on March 18, 2014, the air sparge compressor was not operating, and it was determined that it would need to be replaced. A new compressor was placed on-site on March 19, 2014; however, additional electrical work will need to be done to become operational. Tesoro plans to bring the new air sparge compressor on-line during the 4th quarter of 2014. The soil vapor extraction system was operating within normal parameters with 4.5 part per million by volume. Alyce Hughey
11/4/2014 Meeting or Teleconference Held Paul Horwath attended the ADEC/Tesoro Annual planning meeting held at the MWH office In Anchorage to discuss the Corrective Action Plan for 2014, the application of Chem-ox and the remediation system installation and operation. Paul Horwath
11/20/2014 Site Characterization Report Approved Reviewed the MWH prepared, July 2014 Monitoring Event Report, Final - September 2014. Paul Horwath
10/8/2015 Document, Report, or Work plan Review - other Reviewed the March 2015 Monitoring Event Report, prepared by MWH, dated June 2015. Remediation system remains operational. 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
12/6/2016 Document, Report, or Work plan Review - other Review MWH's October 2016 Monitoring Event Report, dated Final - November 2016. The treatment system operations appear to be reducing GW contaminant concentrations, based on the improved GW quality in the down-gradient treatment system extraction well. Paul Horwath
11/17/2017 Site Characterization Workplan Approved ADEC issued written approval of MWH/Stantec's November 3, 2017, Work Plan for Task 3 to Install Confirmation Soil Borings (CSBs)/Groundwater Monitoring Wells (MWs). Paul Horwath
12/1/2017 Document, Report, or Work plan Review - other ADEC reviewed and provided comments to, Stantec's July 2017 GW Monitoring report. 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 work proposed for 2018. Paul Horwath
2/6/2018 Offsite Soil or Groundwater Disposal Approved ADEC issued approval for offsite transport/disposal of contaminated drill cuttings to NRC Alaska, for ultimate transport to, and disposal at, a Class D permitted landfill in the State of Oregon. Paul Horwath
6/21/2018 Document, Report, or Work plan Review - other Reviewed the March, 2018 GW monitoring report, prepared by Stantec. Need to get the treatment system back in operation, as GW contaminant concentrations are rising. Paul Horwath
9/5/2019 Offsite Soil or Groundwater Disposal Approved Approval to transport 4 drums of drill cuttings from a 4" remediation well to NRC Alaska for disposal. Peter Campbell
9/23/2019 Document, Report, or Work plan Review - other Reviewed the July, 2019 GW monitoring report, prepared by Stantec. A new 4" groundwater treatment well was installed (RW-2). Chemox treatment was continued in the injection galleries. Peter Campbell
11/22/2019 Document, Report, or Work plan Review - other Review the 2020 Corrective Action Work Plan. New well, RMW-2 installed, wiring to be completed in 2020. Chemox treatment to be added twice a year, in spring and fall. New groundwater recirculating pump and treat system to be installed for capture and recirculation into infiltration gallery under fuel islands. Peter Campbell
12/12/2019 Meeting or Teleconference Held Meeting held with Tesoro, the consultant and ADEC to discuss site conditions and the work plan for 2020. Peter Campbell
12/16/2019 Update or Other Action Issue work plan approval letter for the Corrective Action Work Plan for 2020. Peter Campbell
10/27/2020 Update or Other Action 1. The third and fourth quarter monitoring events were completed. 2. The submersible well pump and plumbing system was installed and activated in the new remediation/recirculation well RM-2. The well has been operating on a continuous basis at a pumping rate of approximately 8 gallons per minute for the past few months. We just completed the installation of heat trace lines and insulation on the well discharge lines. In the near future, we plan to install iMonnit controls so that we could operate this well pumping (recirculation) system on a full time yearly basis. 3. We completed 2 separate injections of Klozur One in the 3 horizontal remediation wells located under the existing fuel dispensers and along the east perimeter of the USTs. Peter Campbell
12/29/2020 Document, Report, or Work plan Review - other Wells G-5, MW-10, MW-11, MW-12, MW-13, MW-17-1 and MW-17-2 were impacted with hydrocarbons above groundwater cleanup levels. Laboratory sample results indicate that the operation of the groundwater remediation system is achieving remediation. Peter Campbell
1/27/2021 Document, Report, or Work plan Review - other Review October 2020 Report. Hydrocarbon concentrations have increased in RM-2, which indicated that the recovery well is capturing the impacted groundwater plume. Hydrocarbon concentrations have decreased in MW-17-1 and MW-17-2, indicating that the chemox injection is working. Peter Campbell
2/11/2021 Document, Report, or Work plan Review - other 2021 Corrective Action Plan ADEC Approval Peter Campbell
11/2/2021 Document, Report, or Work plan Review - other March 2021 sampling event of Monitoring Wells MW-12, MW-13, MW 17-1, MW 17-2, G-1 and RM-1. Results showed that analytes detected above ADEC groundwater cleanup levels for all wells tested in the primary groundwater samples were: MW 12: Ethylbenzene. MW 17-1: Ethylbenzene, xylenes, gasoline range organics (GRO), diesel range organics (DRO), 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, and naphthalene. MW 17-2: DRO, and naphthalene. RM-2: Benzene, ethylbenzene, xylenes, GRO, DRO, 1,2,4-trimethylbenzene, and naphthalene. Petroleum contaminant levels have decreased appreciably in MWs 17-1 and 17-2 which may be an indication of in-situ treatment with the chemox injection. Peter Campbell
12/7/2021 Meeting or Teleconference Held 2022 Corrective Action Work Plan meeting Peter Campbell
12/8/2021 Document, Report, or Work plan Review - other 2022 Corrective Action Work Plan - ADEC Work Plan Approval Peter Campbell
2/9/2022 Document, Report, or Work plan Review - other Review October 2021 Groundwater Monitoring Event Report. Report approved. There is a general decreasing trend in BTEX and GRO compounds in site monitoring wells. DRO and GRO concentrations are increasing in RM-1, the remediation well. Peter Campbell
4/7/2022 Update or Other Action Unusual snow depths prevented access to monitoring wells for first quarter 2022 groundwater sampling. Peter Campbell
8/22/2022 Document, Report, or Work plan Review - other 1st Quarter 2022 sampling event. Chemox treatment not added during the first quarter sampling event due to severe weather. Well MW-13 was inaccessible for sampling due to an ice plug. The well pump in RM-1 and RW-2 was inoperable due to severe winter conditions. Flow was to the south during this event under non-pumping conditions. Flow is normally to the North. Peter Campbell
11/30/2022 Long Term Monitoring Workplan or Report Review Review September 2022 3rd Quarter Monitoring Event Report. Monitoring Well MW-1 was inundated with storm water runoff. The well cap had been flipped over. The well may be compromised. MW17-1 has the highest levels of impact at the site. MW-17 -2 has the highest levels of sodium. Benzene is prevalent on site, present in all wells except MW-10, MW-16 and RW-1. Peter Campbell
12/1/2022 Long Term Monitoring Workplan or Report Review Review and approve the Supplemental Report for October 2022 GWM Event. EDB present in three sampled wells, MW-17-1, MW-17-2 and RM-2. Lead present in 2 wells, MW-17-1 and MW-17-2. Sodium higher in MW-17-1, MW-17-2. Peter Campbell
12/2/2022 Long Term Monitoring Workplan or Report Review Review the 2023 Corrective Action Work Plan. Modify former air sparge system into a chemox pump and treat system. Installation of 4” injection wells during first three quarters of the year. Horizontal injection along the northeast edge of the UST’s. Detailed injection plan to be submitted during the 1st Q 23. Peter Campbell
12/6/2022 Meeting or Teleconference Held Annual meeting to discuss work accomplished in 2022 and the 2023 Corrective Action Work Plan. Peter Campbell
5/18/2023 Document, Report, or Work plan Review - other Review and approve the Supplemental 2023 Work Plan for Task 4 for the installation of 5 new injection wells in previously used air sparge vaults. The wells will become part of the Chemox injection system. Peter Campbell
10/16/2023 Long Term Monitoring Workplan or Report Review Review and approve the August 2023 2Q Groundwater Monitoring Report. Several wells (4) were inaccessible due to early spring conditions – water flooding and ice. Naphthalene and benzene present on most wells except MW-16, which has elevated levels of DRO. MW-17 has the greatest levels of impacts. The remediation system was repaired and operational on May 22, 2023 after a traffic accident disabled the above ground systems. Peter Campbell
10/27/2023 Offsite Soil or Groundwater Disposal Approved Investigation Derived Waste Soil Transport approved 10.27.2023 Peter Campbell
12/7/2023 Long Term Monitoring Workplan or Report Review 2024 Corrective Action Work Plan approved. Peter Campbell
12/8/2023 Long Term Monitoring Workplan or Report Review Review and approve July, August and September 2023 3Q GWM Event Report. Peter Campbell
12/8/2023 Long Term Monitoring Workplan or Report Review November 2023 4Q GWM Event Report - ADEC Approval Peter Campbell
12/8/2023 Update or Other Action Review and approve the Technical Memorandum Decommission of Air Sparge Well and Installation of 4” Chemox Injection Wells. The existing four air sparge wells were replaced with 4" Chemox injection wells to facilitate the delivery of the oxidizing compound. The air sparge wells were pulled and the boreholes redrilled to install te2 shallow (18') injection wells. Injection well IW-C was relatively clean with only DRO impacts. Peter Campbell
2/28/2024 Long Term Monitoring Workplan or Report Review Routine GW Monitoring and Chemox injections June 2023. Second Monitoring event for the second quarter 2023 occurred on June 6, 2023, for the analytical sampling of Monitoring Wells MW-11, MW-13 and MW17-2 as well as Remediation Wells RM 1 and RM-2. Wells MW-11, MW17-2, RM-1, had a broad spectrum of hydrocarbons exceeding the cleanup levels. Well RM-2 had ethylbenzene, xylenes and Naphthalene present. In July of 2022 the former air sparge were used to inject recirculated groundwater from remediation well RM-2 into the formation via the following former AS wells: AS-4, AS-12, and AS-14. In addition, Chemox was injected into the 4” diameter injection well located in the southeast corner of the UST footprint. Peter Campbell

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State of Alaska Department of Environmental Conservation

P.O. Box 111800
Juneau, AK 99811-1800
Phone: 907-465-5066
Fax: 907-465-5245
TDD: 800-770-8973
Physical Location: 410 Willoughby