Skip to content
Back to Top

Site Report: US Travel Systems, Former


Site Name: US Travel Systems, Former
Address: 230 Old Steese Hwy; , Fairbanks, AK 99701
File Number: 102.26.046
Hazard ID: 24310
Status: Active
Staff: Shawn Tisdell, shawn.tisdell@alaska.gov
Latitude: 64.848620
Longitude: -147.703320
Horizontal Datum:

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

Prior to 1983 two dispenser islands, five 4,000-gallon gasoline underground storage tanks (USTs) and one 500-gallon waste oil UST were removed without documentation and sampling. The excavation was reportedly backfilled with clean gravel. From January 1995 to December 2003, an air sparge/soil vapor extraction (AS/SVE) system was operated to remediate soil and groundwater at the site. Chevron assumed environmental responsibility for the remaining soil and groundwater cleanup associated with the Texaco operations at the site in 2005.

Action Information

Action Date Action Description DEC Staff
2/7/1992 Site Added to Database * Not Assigned
2/7/1992 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77735 ADD; * Not Assigned
2/12/1992 Underground Storage Tank Site Characterization or Assessment SA1R; * Not Assigned
2/28/1992 Update or Other Action RPS; * Not Assigned
3/17/1992 Update or Other Action TECH; Spoke about site to lawyer for PRP. * Not Assigned
3/19/1992 Update or Other Action TECH; Met w/property owner of USTravel Systems site. Explained/helped fillout UST Cleanup Grant Application package. * Not Assigned
3/24/1992 Update or Other Action NOR; Letter sent to validate release. Requested release investigation & cleanup. * Not Assigned
8/3/1992 Update or Other Action CORR; Thomas responded to attorney letter. Re: PRP liability. * Not Assigned
8/28/1992 Update or Other Action UPD; Hung reviewed. * Not Assigned
10/14/1992 Update or Other Action MEET; Thomas - met with property owner to discuss release investigation strategy. * Not Assigned
10/26/1992 Update or Other Action CORR; Thomas - Summarized outline of release investigation requirements. * Not Assigned
11/19/1992 Underground Storage Tank Site Characterization or Assessment SA1; Thomas - Received and reviewed draft proposal for SA/RI; approved w/4 conditions; requested revised draft, site is funded under UST FAP program. * Not Assigned
11/19/1992 Underground Storage Tank Site Characterization or Assessment SA1R; Thomas - Reviewed and conditionally approved draft proposal. * Not Assigned
2/16/1993 Update or Other Action MEET; THomas: met with J. Feist and S&W , reviewed and verbally approved modified work plan. Fianl version will be submitted next week. * Not Assigned
3/15/1993 Update or Other Action CORR; Thomas gave final approval of modified release investigation plan. * Not Assigned
3/22/1993 Underground Storage Tank Site Characterization or Assessment SA1; Thomas: S&W completed release investigation which included 7 borings, 4 of which were converted into MW's. Free product found in all wells ranging from sheen to 3.75" in DOT-MW. No waste oil constituents noted. Soils contaminated at varying levels in borings. Contamination more widespread than suspected. Hydraulic link to MAPCO unknown. * Not Assigned
5/6/1993 Release Investigation RELR; Thomas reviewed and approved release investigation. Suggested completing GW elevations & analyses and begin developing corrective action strategy to include plume delineation, tank removal, product recovery (where feasable). Will await to receive summary of GW data and list of treatment alternatives. * Not Assigned
5/26/1993 Update or Other Action MEET; Thomas met with Fiest/Davidson and S&W to discuss summary of Release investigation. ADEC suggested continuing collecting data on GW and begin a draft corrective action proposal. Final RI report will be submitted w/recommendation for cleanup. Talked with FAP people as well, to coordinate next year's funding request. * Not Assigned
8/24/1993 Update or Other Action MEET; Thomas met with US Travel to discuss S&W's Corrective Action plan, schedule and cost. Thomas will offer full tech review and comment shortly. Conceptually, plan looks good. * Not Assigned
8/24/1993 Leaking Underground Storage Tank Corrective Action Underway CAPR; Thomas reviewed and conditionally approved CAP for site. Plan calls for 3 additional MWs, and an air sarg/VES treatment system in situ. Plan also includes removal of 1-3 suspected in-place USTs. Tanks to be removed Fall '93, VES to be designed winter 93-94 and pilot and fianl snatem tested and installed spring '94. * Not Assigned
9/10/1993 Leaking Underground Storage Tank Corrective Action Underway LCAR; Thomas reviewed and approved revised corrective action plan for ground water remediation. Modifications to original plan included manual free product recovery, a contingency for haz wastes removed from waste oil tank, tank decommissioning notice, a pilot test for the AS/VES system, and excluded a well search. Thomas approved work elements and schedule. Forwarded plan to UST FAP for fiscal approval. * Not Assigned
1/14/1994 Update or Other Action RPL2; Peterson sent PRP-CS Database Notification Letter to RP requesting update and more environmental information. RP responded with completed information form. * Not Assigned
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. * Not Assigned
8/1/1994 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU; Abandonned waste oil tank removed. AS/SVE system designed and installed. System should be on line by 2/95 to treat contaminated soil, ground water and free product. * Not Assigned
8/24/1994 Underground Storage Tank Site Characterization or Assessment SA1R; Thomas reviewed SA for 500 gallon used oil tank. Approx. 6 yards of contaminated soils removed and stockpiled. Exploratory trench dug as well to try and locate another suspected UST. Not found. 15 yards of soil from trench were stockpiled. All soils were brought to OIT for incineration. Soils beneath tank below cleanup levels; waste oil tank closed. Cleanup will continue on the rest of the property under the FAP grant. * Not Assigned
9/16/1994 Leaking Underground Storage Tank Corrective Action Underway CAPR; Thomas reviewed CAP for AS/SVE. Made a number of design comments that were addressed in phone conference with Shannon & Wilson. Only outstanding issue is VOC emmissions. Plan conditionally approved. System should be installed soon. * Not Assigned
9/27/1994 Update or Other Action CORR; Thomas sent correspondence to Alaska Environmental Specialists, stating that the Site Assessment information as provided is not adequate. Requested full SA/Tank closure/CAP within 30 days. Also spoke with AES that day and asked them to coordinate soil treatment with Kenai district. Plan as approved by ADEC not followed and therefore not approved. * Not Assigned
10/3/1994 Update or Other Action CORR; Thomas sent final approval letter for CAP. Contingency stated that of VOC emmissions exceeded, ADEC will ask for immediate correction. * Not Assigned
1/13/1995 Update or Other Action UPD; SITE SUMMARY: AS/SVE system by S&W about to go on line. Site has GW (product) in all corners of property. System should be operational shortly, afterwards, ADEC should receive quarterly ground water sample results. Watch for plume co-mingling from adjacent MAPCO station. * Not Assigned
1/17/1996 Leaking Underground Storage Tank Corrective Action Underway CAPR; Reviewed on-going CAP of SVE/Air Sparging & FA. Consulted w/RPCON on costs reduction. Decided to change schedule fr. quarterly to every 6 mos. for grd. water sampling effective 6/96. Wrote ltr. to RP/RPCON re-decision. * Not Assigned
4/4/1997 Long Term Monitoring Established Approved RPCON's 12/12/96 work plan for FAP. Unable to reduce lab costs due to reg requirement. * Not Assigned
11/20/1997 Update or Other Action ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: US TRAVEL SYSTEMS - DAVIDSON INC * Not Assigned
12/1/1997 Long Term Monitoring Established Approved '98 wk pl for FAP. Modification of MW 1 (VEW1b) since grd water changed direction to more westerly than NW. DOT road widening Proj. spring '98 will jeopardize half of MW1 w/proposed VEW1b. Also affect AIW-3, MW5, AIW-5 & MW2. * Not Assigned
10/14/1998 Long Term Monitoring Established Reviewed FY '99 wk pl for FAP. Approved except for some reductions in sampling schedule. MWs 4, 5 & 6 once/yr as Benzene high, MWs 1, 2 & 3 twice/yr as MW1 new air sparge/SV wells installed, MW 4 analyze w/602/601/624 (MW 2 & 3 show nothing) & discharge air sampling 2 quarters instead of 4. Road proj. not started. * Not Assigned
1/31/2001 Update or Other Action Groundwater monitoring report submitted. Event was scheduled for July 2000 but was postponed due to dewatering in the Old Steese Highway. Samples were collected from MW-2 and MW-3 on November 17. The rest of the samples were collected on December 1 following construction of the sewer line in the Old Steese. Seven wells contained benzene above cleanup levels; the maximum concentration was 1,010 ppb (in MW-3). EDB was detected in MW-4. Janice Wiegers
1/23/2002 Report or Workplan Review - Other Summary report submitted under Grant 15274231. Conceptual Site Model included in report. On-site indoor air and excavation/trench workers identified as primary receptors. Janice Wiegers
1/24/2002 Update or Other Action Groundwater monitoring and well point installation report submitted. Groundwater samples and two slough samples were collected on July 30. Eight well points were installed on Santina's Flowers and Burger King properties and sampled on September 6 and 7. Benzene exceeded cleanup levels in MW-4 and MW-7 with a maximum concentration of 26.1 ppb in MW-4. Benzene exceeded cleanup levels in all well points except WP-1, with a maximum concentration of 520 ppb in WP-7. PCE exceeded cleanup levels in WP-6, but was attributed to a separate source. Slough water samples were collected in two places - no contaminants detected. Janice Wiegers
4/5/2002 Update or Other Action Groundwater monitoring report submitted. Samples collected on February 22. Benzene exceeded cleanup levels in MW-3 and MW-6, with a maximum concentration of 1,700 ppb. In general, samples collected without purging. A sample collected at MW-3 with purging contained approximately 2x the benzene concentration as the no-purge sample. Slough contained 1.5 feet of ice and was not sampled. Janice Wiegers
1/17/2003 Update or Other Action Groundwater monitoring and slough sampling report submitted. Samples collected August 19 and 20. Maximum benzene concentration (280 ppb) in new off-site well MW-9. Maximum GRO (3.4 ppm) in MW-4. Solvents detected below cleanup levels in MW-9. Geochemical analysis of the groundwater suggests not enough oxidants present to biodegrade observed GRO concentrations. Janice Wiegers
1/23/2003 Update or Other Action Release investigation and CSM report submitted. MW-9 and MW-10 were installed. The system continues to remove VOCs, but appears to hve reached limits of effectiveness. However, benzene levels have fluctuated up to 1,700 ppb during recent groundwater sampling. Janice Wiegers
5/20/2003 Report or Workplan Review - Other System performance report submitted. Evaluated system performance and conclude that GRO and benzene are dissolving into the groundwater from outside the radius of influence of the treatment wells. Cost of additional treatment wells may not be cost-effective. Enhanced bioremediation approach is planned for this site as a polishing step. Janice Wiegers
10/27/2003 Update or Other Action Bioremediation treatability study report submitted. No significant effects were found during bench-scale testing for adding nitrogen amendments. Nitrogen amendments not recommended. Janice Wiegers
11/24/2003 Update or Other Action Semiannual groundwater monitoring report submitted. Janice Wiegers
1/14/2004 Update or Other Action ChevronTexaco responds to PRP letter accepting responsibility for the contamination. Chevron will submit a plan to further evaluate the extent of impacted groundwater and to enhance the remediation system by the second quarter of 2005. Janice Wiegers
3/5/2004 Report or Workplan Review - Other ADEC approves workplan for Indoor Air Quality assessment of the office building at 230 Old Steese. Janice Wiegers
4/7/2004 Update or Other Action Indoor air quality assessment plan submitted. Use of commercial exposure parameters proposed. DEC approves with use of more stringent parameters. Janice Wiegers
6/14/2004 Update or Other Action Indoor air quality assessment submitted. A limited ventilation and airflow evaluation was completed. Two indoor air and one outdoor air samples were collected in April and again in May. BTEX levels were below the DEC acceptable risk level but above the level typically used to indicate monitoring is needed. There was indication that contaminants could be from outdoor air. Janice Wiegers
6/14/2004 Update or Other Action Summary report for indoor air assessment submitted. Summarized indoor air data for all constituents tested. Janice Wiegers
6/14/2004 Update or Other Action Request for NFRAP submitted. Janice Wiegers
6/14/2004 Report or Workplan Review - Other Report describing injection of oxygen releasing compound submitted. ORC was injected into 15 soil boring at 17 feet bgs in the former tank and dispenser island locations. Borings were space approximately 10 feet apart. ORC was also injected into sparge wells AIW-4, AIW-5, AIW-6, AIW-7, and AIW-8. Repairs to the sparge wells will be needed if the system is restarted. Janice Wiegers
10/14/2004 Update or Other Action PRP letter sent to ChevronTexaco following a meeting with the current landowners. Texaco was identified as the owners and operators of the USTs that resulted in the release. According to Mr. Davidson, he never operated the gas station and removed the USTs after buying the property. Janice Wiegers
8/15/2005 Update or Other Action Oasis submits groundwater monitoring report on behalf of ChevronTexaco. Tested for GRO and VOCs. EDB also tested with Method 504 in MW-4 and MW-8. MW-1, MW-2, MW-3, MW-4, MW-6, and MW-7 contained contaminant levels above the MCL. EDB was observed above the cleanup levels in MW-4 and MW-6. 1,2-DCA exceeded cleanup levels in MW-4. Based on previous discussions with Secor, ChevronTexaco plans to conduct several monitoring events to evaluate the groundwater quality after the system was shutdown before deciding what further action to take. Janice Wiegers
12/19/2005 Report or Workplan Review - Other Oasis submits groundwater monitoring report for October sampling. Wells were resurveyed - groundwater flow direction was similar to historical directions. However, gradient may steepen near the slough. Contaminants were found in all nine wells sampled with the highest concentations in MW-4 and MW-6. VOCs and EDB (method 8011) were tested in select wells. EDB was the only analyte found above groundwater cleanup levels (in MW-4). Janice Wiegers
6/29/2006 Update or Other Action Dave Mongold is a prospective purchaser of the property and has hired an attorney, James DeWitt to inquire about liability issues with purchasing the property. Deborah Williams
8/8/2006 Update or Other Action ADEC received BBL's First Semi-Annual 2006 Groundwater Monitoring Report. GRO levels were detected in eight of the nine samples with concentrations ranging from 25 ug/L (MW-8) to 32,000 ug/L (MW-2 and MW-6). Benzene was detected in eight of the nine samples at concentrations ranging from 5.7 ug/L (MW-7) to 2,300 ug/L (MW-4). EDB was analyzed for in MW-1, MW-2, MW-3, MW-4, and MW-8. EDB was detected in samples above ADEC cleanup levels from MW-4 at 0.18 ug/L. Groundwater from MW-2 and MW-3 were analyzed for eight RCRA metals. Arsenic and lead was found above ADEC cleanup levels in both wells. Deborah Williams
12/4/2006 Report or Workplan Review - Other ADEC reviewed the Second Semi-Annual 2006 Groundwater Monitoring Report for the US Travel site. GRO levels ranged from non-detect to 19,000 ppb, DRO ranged from 47 ppb to 5,000 ppb, and bezene ranged from 1 ppb to 1,600 ppb. MW-2 and MW-3 were sampled and analyzed for VOCs, metals, EDB and PAHs and they all met ADEC cleanup levels. Deborah Williams
12/28/2006 Report or Workplan Review - Other ADEC received BBL's report entitled Additional Soil Characterization Report for the Former Texaco 21-1083 LUST site located at 230 Old Steese Highway. A Ground Penetrating Radar and Electromagnetic Survey was completed at the site. Also, 16 membrane interface probe (MIP) borings were completed and advanced to depths of up to 21-feet bgs. The MIP cross-sections showed that generally the VOCs are located in the smear zone from approximately 10-ft to 15-ft bgs or are associated with the impacted groundwater. MIP-16 which was located in the former north dispenser island had VOCs detected at depths as shallow as 8.5-feet bgs. Three confirmational borings were completed and co-located with a MIP boring. Confirmational soil samples were collected from the borings at 5-feet intervals. The laboratory analytical data confirm the MIP data. BBL concluded that the additional soil delineation showed hydrocarbon impact in the smear zone with the exception of the former north dispenser island area. They recommend that Anomaly A be further investigated to determine whether a UST is present or the anomaly was caused by impacted soil. Deborah Williams
3/13/2007 Exposure Tracking Model Ranking Initial ranking completed. Deborah Williams
6/6/2007 Leaking Underground Storage Tank Corrective Action Underway ADEC received and approved the ARCADIS BBLES Remediation Workplan, Former Chevron 211083, Fairbanks, Alaska dated May 17, 2007. Remediation workplan includes installation of 11 soil borings to be used as air sparge wells and 7 soil borings to be used as soil vapor extraction wells. Tamara Cardona-Marek
6/8/2007 Update or Other Action ADEC received ARCADIS BBLES First Semi-annual 2007 Groundwater Monitoring Report for the Former Chevron Facility 211083 site. According to the report, the analytical results of the March 2007 groundwater sampling event are consistent with previous events. During the monitoring event, concentrations of GRO, DRO, benzene, toluene, ethylbenzene, arsenic and lead were greater than the applicable ADEC groundwater cleanup levels in at least one groundwater sample. Deborah Williams
12/10/2007 Update or Other Action ADEC received ARCADIS BBLES First Semi-annual 2007 Groundwater Monitoring Report for the Former Chevron Facility 211083 site. According to the report, the analytical results of the March 2007 groundwater sampling event are consistent with previous events. During the monitoring event, concentrations of GRO, DRO, benzene, toluene, ethylbenzene, and EDB were greater than the applicable ADEC groundwater cleanup levels in at least one groundwater sample. EDB was detected in wells MW-4 and MW-6. Lead and arsenic did not exceed cleanup levels. ARCADIS recommends eliminating EDB sampling from wells MW1, MW2, MW3, MW7, MW8, MW9, and MW10. DEC approves eliminating EDB sampling from wells MW-1, MW-2, MW-7, MW-8 and MW-10. Tamara Cardona-Marek
2/5/2008 Update or Other Action DEC received the ARCADIS Remediation System Installation Report. Tamara Cardona-Marek
6/25/2008 Update or Other Action ADEC received the First Semi Annual 2008 Groundwater Monitoring Report for the former US Travel Site. Results are consistent with previous monitoring events. DRO, GRO, BTEX, EDB and lead exceeded the applicable GCL in at least two monitoring wells. New AS/SVE system was installed and began operating shortly after this monitoring event (4/9/2008). Tamara Cardona-Marek
12/24/2008 Update or Other Action ADEC received the 2008 Second Semi-Annual groundwater Monitoring Report for the US Travel site. DRO, GRO and BTEX has decreased from previous sampling event in wells MW-1, MW-4 and MW-6. Well MW-3 could not be sampled. Contaminants in well MW-5 maintained concentrations similar to previous sampling events. AS/SVE system has been working since April 2008. Tamara Cardona-Marek
3/13/2009 Meeting or Teleconference Held ADEC dicussed with Chevron and Arcadis the status of the site. AS/SVE system will continue to operate on the site. Arcadis will submit graphs and plume maps to show progress over time as part of the current year's tasks. Tamara Cardona-Marek
6/8/2009 Update or Other Action DEC received the First Quarter 2009 Remediation System Operation and Maintenance Report for the US Travel Site. System was operational for ablmost 100% of the planned operational period. No benzene detected in the air effluent samples. 39 pounds of GRO were removed during this reporting period. Tamara Cardona-Marek
6/9/2009 Update or Other Action DEC received sample results from purge water and request for approval to transport through Emerald to Anchorage for disposal. DEC granted approval. Tamara Cardona-Marek
6/30/2009 Offsite Soil or Groundwater Disposal Approved Approval granted for disposal of 6 55 gal drums of soil originating from site. No contaminants above cleanup levels detected in composite samples. Tamara Cardona-Marek
12/3/2009 Report or Workplan Review - Other DEC received and reviewed the First Semi-Annual 2009 groundwater monitoring report. Contaminant concentrations are consistent with previous monitoring events. MNA parameters were measured, however AS/SVE system is currently running. Arcadis recommended that monthly gauging is suspended. DEC agreed with the recommendation but requested that a graph and information documenting the trends observed is submitted. Chevron has changed consultants from Arcadis to CRA, therefore future reports and monitoring events will be done by CRA. Tamara Cardona-Marek
12/4/2009 Report or Workplan Review - Other DEC received the second quarter operations and maintenance report for 2009 for the AS/SVE system. Approximately 165 pounds of GRO were removed from the subsurface during this reporting period. Tamara Cardona-Marek
3/12/2010 Meeting or Teleconference Held DEC met with Chevron and CRA to discuss actions for 2010. CRA proposes to conduct a rebound study and continue semi annual sampling to evaluate its effects. System will be restarted if conditions significantly rebound. Tamara Cardona-Marek
2/10/2011 Report or Workplan Review - Other DEC received and reviewed the two Semiannual 2010 Groundwater Monitoring Reports for this facility. Tamara Cardona-Marek
2/15/2011 Update or Other Action CRA submitted responses to DEC comments on the 2010 Groundwater Monitoring Reports. Tamara Cardona-Marek
2/24/2011 Meeting or Teleconference Held DEC met with Chevron to discuss the proposed 2011 site activities. Semi annualgroundwater monitoring will continue . Possible rebound of contaminants will be evaluated. Conceptual site model will be updated. Tamara Cardona-Marek
8/2/2011 Site Visit Site visit with consultant and DEC intern to see remediation system. Tamara Cardona-Marek
8/2/2011 Meeting or Teleconference Held DEC met with Chevron and CRA to discuss status of site. Remediation system has been shutdown for rebound testing. Tamara Cardona-Marek
8/5/2011 Report or Workplan Review - Other DEC received from CRA and reviewed the 2009 and 2010 Operations and Maintenance and Groundwater Monitoring Reports. Contaminant concentrations in groundwater have decreased, results of rebound test are pending. Tamara Cardona-Marek
8/8/2011 Report or Workplan Review - Other DEC received from CRA and reviewed the First and Second Semi Annual 2010 Groundwater Monitoring Report. Tamara Cardona-Marek
12/29/2011 Report or Workplan Review - Other DEC received the First and Second Semi Annual 2011 Groundwater Monitoring and Sampling Report for the former US Travel site. GRO exceeded the groundwater cleanup levels in wells MW-3 and MW-5 in both events and in MW-2 in one of the monitoring events; benzene exceeded cleanup levels in wells MW-1, MW-3 through MW-6, and in MW-9; DRO was exceeded in wells MW-3 through MW-6. Tamara Cardona-Marek
12/31/2012 Report or Workplan Review - Other DEC received the Revised First semi-annual and the Second Semi-annual 2012 groundwater monitoring and sampling reports from CRA. Benzene, DRO, and GRO remain above groundwater cleanup levels in MW-2, MW-3, MW-4, MW-5, and MW-6. MW-1 and MW-9 had benzene above cleanup levels in June, but not in August. The air sparge/soil vapor extraction remediation system could not be restarted due to electrical issues and is currently under repair. Robert Burgess
2/27/2013 Meeting or Teleconference Held DEC met with Chevron and consultants. Discussed problems hindering the start-up of the remedial system on site. Electrical and program logic issues are holding up the re-start. CRA plans to continue to work on the system and hopes to either repair or begin to replace it by spring of 2013. Robert Burgess
9/17/2013 Report or Workplan Review - Other DEC received the First Semi-Annual 2013 Groundwater Monitoring and Sampling Report. The remedial system was re-started in March 2013. The system has decreased concentrations in several wells compared to the most recent sampling events, however contaminants remain above cleanup levels in source area wells MW-1, MW-4, and MW-5, and in MW-9. The system will run for at least one year before evaluating rebound. Robert Burgess
12/3/2013 Report or Workplan Review - Other DEC received the Second Semi-Annual 2013 Groundwater Monitoring and Sampling Report. Contaminant concentrations have decreased to levels below cleanup in all wells except MW-4, which contained DRO at 1.7 mg/L. Natural attenuation paramaters were measured despite the AS/SVE system operating. Air sparging has shifted conditions from highly reduced to more oxidizing. Robert Burgess
1/27/2014 Report or Workplan Review - Other DEC reviewed and commented on the 1st semiannual 2013 remediation system operations and maintenance report. The system was restarted in March of 2013 and will run for at least one year before re-evaluating rebound. Robert Burgess
2/26/2014 Meeting or Teleconference Held DEC met with Chevron and their consultants for a project update and planning session. The effectiveness of the remedial system is declining and Chevron has requested removal of the system by July 1, 2014. Previous rebound tests showed minimal rebound; DEC agreed to review the data and respond to the request as soon as possible. A vapor intrusion assessment for the on-property building will be conducted after the system is shut down, since it will no longer be mitigating soil vapor. MNA sampling was discussed, and it was agreed that more data is needed before drawing conclusions about MNA at the site. The sampling schedule will be adjusted to allow for sampling during winter, when the aquifer is in a steady state. Robert Burgess
4/10/2014 Update or Other Action DEC approved the removal of the remedial system at the site with the condition that the vapor intrusion pathway be evaluated when the system is shut off, and that mitigation of this pathway is implemented if vapor intrusion is a risk. Robert Burgess
4/15/2014 Update or Other Action DEC received notice that the remedial system would be shut down this week in order to allow adequate time for equilibration before the soil vapor/vapor intrusion investigation. Robert Burgess
5/8/2014 Site Visit DEC project manager visited the site to observe groundwater sampling. Robert Burgess
5/9/2014 Site Visit DEC project manager visited the site to observe boring hole clearance for soil vapor probe installation as well as soil sampling from the base of the boreholes. Robert Burgess
5/21/2014 Report or Workplan Review - Other DEC provided comments on the Soil Vapor Assessment Workplan. Robert Burgess
5/28/2014 Report or Workplan Review - Other DEC approved the Soil Vapor Assessment workplan following comment resolution and revision. Three soil vapor probes will be installed near the slab-on-grade building to a depth of 8 feet to evaluate the presence of soil gas and likelihood of vapor intrusion. Robert Burgess
6/2/2014 Site Visit DEC staff Burgess and Wiegers visited the site to answer questions related to soil vapor sampling and to observe sampling of soil vapor probes. Robert Burgess
6/16/2014 Report or Workplan Review - Other DEC project manager approved the Remedial System Decommissioning workplan. Robert Burgess
2/24/2015 Meeting or Teleconference Held ADEC project manager met with Chevron and CRA after providing comments to several reports, including the First and Second Semi-Annual Groundwater Monitoring Reports, the Remedial System Decommissioning Report, the Soil Vapor Assessment Report, and an updated conceptual site model. Revised reports will be submitted or comments will be incorporated into reports that include the second round of vapor sampling. Currently all of the equipment from the remedial system has been removed from the site and there is no evidence of rebound. Planned work is to analyze data from the second vapor sampling event, decommission vapor probes if below target levels, and continue semi-annual monitoring of groundwater. Robert Burgess
3/9/2015 Report or Workplan Review - Other ADEC reviewed the revised First and Second Semiannual groundwater monitoring reports. Concentrations of hydrocarbons in groundwater remain stable following shutdown of the remedial system. Samples from source area wells continue to be slightly above cleanup levels; monitored natural attenuation will be employed at the site to ensure that concentrations continue to decrease through biodegradation. Robert Burgess
5/13/2015 Report or Workplan Review - Other DEC approved the Soil Vapor Probe Decommissioning workplan and the Revised Groundwater Sampling Workplan. Robert Burgess
2/11/2016 Report or Workplan Review - Other ADEC reviewed the August 2015 Soil Vapor Probe Decommissioning Report. Work conducted by GHD followed the approved work plan and field notes indicated the work included repairs to a decommissioned system well cement plug that had been damaged by a snow plow. Three soil vapor probes were decommissioned on May 28, 2015. Tubing was removed and bentonite was used to fill the boring. Gravel and asphalt were added to bring the fill up to grade. Decommissioning photos were requested. Shawn Tisdell
2/11/2016 Report or Workplan Review - Other The December 31, 2015 Revised Conceptual Site Model was reviewed. ADEC indicated Noyes Slough must be considered a complete pathway for surface water ingestion, not incomplete as written in the report, as it can potentially be a source of drinking water, even though the water quality is poor. Shawn Tisdell
2/12/2016 Report or Workplan Review - Other Decommissioning photos of soil vapor extraction wells received by DEC. Shawn Tisdell
2/24/2016 Meeting or Teleconference Held Teleconference meeting between ADEC and Chevron consultants from GHD. Reviewed completed work described in previous action comments. In 2016 GHD will continued semiannual groundwater monitoring and report submission. Shawn Tisdell
3/4/2016 Report or Workplan Review - Other DEC has reviewed the Second Semi-Annual 2015 Groundwater Monitoring Report from GHD Services Inc. Past remediation at the site has significantly reduced groundwater contamination. However, groundwater contamination measured during the September 17, 2015 sampling event remains in excess of cleanup levels around the source area. Samples from MW-5, which is on the east edge of the source area and near the eastern property boundary, contained the highest levels of contaminants of concern (COCs). Monitoring of all site wells will continue for 2016 for COCs including GRO, DRO, benzene and include monitoring of groundwater flow direction and gradient. Shawn Tisdell
8/1/2016 Report or Workplan Review - Other DEC received and reviewed 2016 Groundwater Monitoring and Sampling Work Plan. Sampling frequency will be reduced to once per year. Shawn Tisdell
9/28/2016 Meeting or Teleconference Held Meeting at the Fairbanks DEC office with representatives from Chevron and GHD. Post remediation borings to assess remaining soil contamination levels and MNA parameters was discussed. The impact of new cleanup levels from the updated regulation package will also need to be evaluated. Shawn Tisdell
10/6/2016 Meeting or Teleconference Held Meeting with RP and consultant on multiple Chevron sites to discuss current site status and upcoming site action. Shawn Tisdell
11/29/2016 Report or Workplan Review - Other DEC reviewed the First Semiannual 2016 Groundwater Monitoring Report. Some rebound of hydrocarbon contaminant levels has occurred in the source area wells following the 2014 removal of the soil vapor extraction/air sparge system, however the levels remain significantly lower than before system operation. . Due to the observed rebound in contaminant concentrations in these wells, additional monitoring of the source area wells will be needed to satisfy closure conditions. DEC recommends providing additional lines of evidence to indicate closure criteria have been met. Shawn Tisdell
7/6/2017 Report or Workplan Review - Other DEC staff reviewed a work plan titled "Site Assessment Work Plan" and approved of the work scope. This scope includes advancing six soil borings at down gradient locations to areas with previous cleanup level exceedances in order to assess attenuation in areas with previous exceedances and to evaluate post-remediation soil quality. This work is scheduled for the third quarter of 2017. Shawn Tisdell
8/11/2017 Site Visit DEC staff visited the site to observe a portion of the geotechnical survey being conducted in preparation for upcoming site assessment that will consist of installing 5 soil borings. The survey consisted of a technician from ULS Services Corp. who used a pipe locators and a ground penetrating radar system to identify potential obstructions and utilities in the proposed boring areas. Shawn Tisdell

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details

Requirements

Description Details

There are no documents for this site report.

Missing Location Data

Because the GIS location data for this site has not been entered, we cannot direct you to its position on the map. Click "Continue" to proceed to the Contaminated Sites Web Map or "Close" to return to the site report.
Continue     Close