Skip to content
Back to Top

Site Report: Petroleum Sales / UNOCAL


Site Name: Petroleum Sales / UNOCAL
Address: 328.5 Illinois Street, Fairbanks, AK 99707
File Number: 102.38.004
Hazard ID: 733
Status: Active
Staff: Shawn Tisdell, shawn.tisdell@alaska.gov
Latitude: 64.849310
Longitude: -147.723530
Horizontal Datum:NAD83

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

Initial investigation associated with Illinois and Minnie Street Connector road project. Subsequent water and soil sampling in 1990 revealed high levels of petroleum contamination in surface soil samples. Hydrocarbons and various solvents in the groundwater. Contamination is assumed to be associated with the Unocal Bulk Fuel plant, which operated between 1952 and 1982. State Land. Also see file number: 102.38.007. Odor and sheen from water samples and staining in the upper 2 feet of bore holes.

Action Information

Action Date Action Description DEC Staff
4/1/1989 Update or Other Action (Old R:Base Action Code = SA1 - Phase I Site Assessment (General)). DOT contracted Shannon and Wilson, Inc. to investigate past uses and potential hazards at the site as part of a right-of-way road project. Shannon and Wilson, Inc. report, "Preliminary Hazardous Waste Site Evaluation, Proposed Minnie Street Connector, Fairbanks, Alaska" identified data gaps concerning management of DOT's vehicle and equipment maintenance program which was located at the site. No Longer Assigned
12/1/1990 Site Characterization Report Approved (Old R:Base Action Code = SI - Site Investigation). DOT contracted Shannon and Wilson, Inc. to investigate parcel of site needed for proposed right-of-way. Their report, "Final Report: Illinois Street and Minnie Street Connector Hazardous Waste Field Investigation, Phase II" dated 12/90 reports that 3 of 6 soil samples from groundwater monitoring well and soil boring had low levels of chlorobenzene; 0.07 - 0.16 ppm. 2 water samples from separate groundwater monitoring wells had levels of 1,2-dichyloroethane, PCE, TCE and BTEX above MCLs. 2 surface soil samples had high levels of TPH (1610 ppm and 310 ppm). A sheen was observed on the water samples and an odor was noted from the monitoring wells. Staining evident in the upper 2 feet of the soil borings. No Longer Assigned
12/17/1990 Site Added to Database Hydrocarbon and solvent contamination found in soil and groundwater. No Longer Assigned
4/29/1991 Update or Other Action (Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Preliminary cleanup alternatives and cost estimates for remediation of the Minnie Street Connector Project submitted to Alaska DOT April, 1991 by Shannon and Wilson. Estimates based on many assumptions and recognizes that information concerning extent of contamination is limited. Proposes floating product recovery, soil remediation, and groundwater remediation over 11 year period at a cost of $10,207,000. Recommends additional sampling for mercury. No Longer Assigned
5/1/1991 Site Ranked Using the AHRM Initial ranking. No Longer Assigned
1/8/1992 Update or Other Action (Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Remedial action plan submitted and reviewed, response letter returned. No Longer Assigned
6/24/1992 Update or Other Action (Old R:Base Action Code = RPL2 - Site Information Request Letter). ADEC sent PRP-CS Database Notification Letter to PRP requesting update and additional environmental information concerning the contaminated site. As of this "complete date" no response has been received. Jeff Peterson
12/18/1992 Update or Other Action (Old R:Base Action Code = CORR - Correspondence (General)). Notified by letter, party of ADEC's intent to use Response Fund monies to initiate a comprehensive area-wide Phase I site Assessment of the Illinois-Minnie Site. Asks to submit questions and comments. Ben Thomas
12/28/1992 Cleanup Assumed by ADEC (Old R:Base Action Code = SLC - Site Lead Cleanup). Correspondence returned to ARRC thanking for comments. Will incorporate into ADEC final version. will keep ARRC and all parties updated on future actions. Ben Thomas
12/28/1992 Update or Other Action (Old R:Base Action Code = CORR - Correspondence (General)). (OSLP) ARRC submitted comments and preferred Site Assessment plan for Illinois-Minnie Site. This Project was first proposed in 1990. Ben Thomas
1/19/1993 Meeting or Teleconference Held Met with Jim Weymiller to discuss proposed workplan for Illinois-Minnie site. Was concerned about cost recovery, scope, intent, timeframe. Has performed additional work and will submit reports to ADEC for our review. Ben Thomas
1/31/1995 Update or Other Action SITE SUMMARY: Ground water impact known, but cleanup delayed pending the outcome of MSLUG efforts. ADEC notified operator of draft COBC to guide cleanup in 1995. Cindy Thomas
7/10/2002 GIS Position Updated Plotted latitude and longitude coordinates and found them to be acceptable for associated property or address. Heather Goldman
7/15/2002 Site Number Identifier Changed Changed Workplan from 01 to 09 to reflect presence of a hazardous substance above cleanup levels. No Longer Assigned
9/13/2002 Site Characterization Workplan Approved At UNOCAL's request, GeoEngineers submitted workplan for site investigation with respect to former UNOCAL tank farm. Field work will include soil and groundwater sampling for petroleum and halogenated compounds. Janice Wiegers
3/11/2003 Update or Other Action Reviewed subsurface site investigation. Detected BTEX, GRO, DRO, 1 2 DCA and Jet Fuel. Torsten Ernst
7/23/2003 GIS Position Updated 64 50 58.94540 -147 43 24.22920 Torsten Ernst
8/20/2003 Proposed Plan Reviewed work plan in which drilling three new wells to approximately 20 feet bgl was proposed. Torsten Ernst
8/28/2003 Update or Other Action Approved soil transport of cuttings to OIT for treatment. Janice Wiegers
7/30/2004 Update or Other Action Reviewed July 15th monitoring report. Performed chromatagraphic, EPH, and VPH analysis. Found free product consistent with Jet-A fuel. Highest concentrations of most contaminants were found in GEI-2. Torsten Ernst
3/17/2005 Meeting or Teleconference Held Met with representatives from ChevronTexaco, Unocal, and the railroad regarding cooridinated sampling and ADEC's areawide requirements for future work. Work plan for off-site investigation and CSM development required by May 30, 2005. Janice Wiegers
5/23/2005 Update or Other Action Groundwater monitoring report submitted for April 2005 monitoring event. Conditions similar to previous events. Product found in GEI-8 for first time. Janice Wiegers
6/20/2005 Proposed Plan Approved work plan for off-site investigation and CSM development. Janice Wiegers
6/23/2005 GIS Position Updated Slightly modified coordinates to reflect more accurate position. Using NAD1983 for datum. Torsten Ernst
12/7/2005 Update or Other Action ADEC received the Results for Groundwater Monitoring at the Former Unocal Bulk Plant - Dated December 1, 2005. In general, BETX, GRO, and DRO concentrations detected during the Oct. 2005 sampling were similar to levels detected during the September 2004 monitoring. Benzene was detected in 12 wells at concentrations ranging from 0.728 ug/L to 8,060 ug/L (GEI-12). DRO was detected in all the wells sampled, except MW-2, at concentrations ranging from 0.421 mg/L in K-7 to 98.7 mg/L in GEI-7. EDB was detected in the groundwater sample from well GEI-2 at a concentration of 0.156 mg/L. Deborah Williams
1/12/2006 Update or Other Action ADEC received a report entitled "Off-site Delineation Former Unocal Bulk Plant" dated January 5, 2006. During the well search they identified a public water system within approximately 1/4 mile from the site. They also identified approximately 138 wells from the National Water Information System (NWIS) and the Well Log Tracking System (WELTS). Three soil borings were drilled and sampled, and groundwater monitoring wells were installed in the borings. Soil conditions in the new wells along the southern property line are similar to the rest of the site. Contamination in the soil varies between the new well locations from being isolated from the groundwater interface in GEI-10 and GEI-11, to spanning the soil column from the ground surface to groundwater in GEI-12. DRO was the primary contaminant encountered in the new wells, however, the groundwater interface sample from GEI-11 also had high concentrations of GRO/BTEX constituents. RRO was not detected in any of the soil samples. Deborah Williams
1/12/2006 Update or Other Action ADEC received a report entitled "Off-site Delineation Former Unocal Bulk Plant" dated January 5, 2006. During the well search they identified a public water system within approximately 1/4 mile from the site. They also identified approximately 138 wells from the National Water Information System (NWIS) and the Well Log Tracking System (WELTS). Three soil borings were drilled and sampled, and groundwater monitoring wells were installed in the borings. Soil conditions in the new wells along the southern property line are similar to the rest of the site. Contamination in the soil varies between the new well locations from being isolated from the groundwater interface in GEI-10 and GEI-11, to spanning the soil column from the ground surface to groundwater in GEI-12. DRO was the primary contaminant encountered in the new wells, however, the groundwater interface sample from GEI-11 also had high concentrations of GRO/BTEX constituents. RRO was not detected in any of the soil samples. Deborah Williams
1/9/2008 Update or Other Action New Chevron Project Manager for this site: Daniel L. Carrier DCarrier@chevron.com Tamara Cardona-Marek
1/10/2008 Update or Other Action DEC received the Second Semi-Annual 2007 Groundwater Monitoring Report from ARCADIS BBL for the former Chevron bulk plant, former texaco bulk plant and former unocal bulk plant. All wells for former Unocal, except MW-13, contained contaminants above DEC cleanup levels. DRO results from Unocal wells showed an increase from the last time they were sampled. Wells GEI2 and GEI7 contained EDB above cleanup levels. GEI 2 also contained lead above cleanup levels. ARCADIS recommends sampling wells GEI 4 , GEI 8, GEI 9, K 7 and MW 4 on an annual basis instead of semi-annual. They also recommend eliminating PAH and volatiles analysis (will continue BTEX). Tamara Cardona-Marek
1/10/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Tamara Cardona-Marek
1/31/2008 Update or Other Action DEC received the 2007 Site Assessment Report for the Former Chevron Bulk Plant, Former Texaco Bulk Plant, and Former Unocal Bulk Plant. Soil samples and vapor probe gas samples were collected at the site. Vapor probe gas samples exceeded screening levels for ethylbenzene, benzene and toluene at depths of 5 and 8.5 feet. From six soil samples collected on the property, four exceeded cleanup levels for DRO's. ARCADIS proposes to conduct another vapor sampling event in 2008. Tamara Cardona-Marek
2/1/2008 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed. Tamara Cardona-Marek
3/18/2008 Update or Other Action Sent e-mail to ARR (Susan Schrader and Karen Morrissey) requesting a meeting to discuss IC's for the FAIR area. Tamara Cardona-Marek
5/21/2008 Institutional Control Record Established Recommendations established. Tamara Cardona-Marek
6/24/2008 Update or Other Action ADEC received the Work Plan for Additional Site Assessment. Work Plan includes installation of 4 vapor probes to sample soil gas near buildings. ADEC recommends the addition of 4 vapor probes to the plan (2 per building) and the analysis of additional volatile petroleum components from the vapor samples collected. Tamara Cardona-Marek
7/11/2008 Meeting or Teleconference Held Met with Dan Carrier (Chevron) and Greg Montgomery (Arcadis) to discuss current activities at the site and plans to do additional assessment. ADEC recommended doing vapor probes on two sides of the buildings on site to assess the potential for vapor intrusion. Additional plume delineation to the west was discussed since the boundary of the plume has not been determined. Tamara Cardona-Marek
8/29/2008 Update or Other Action Received and reviewed the First Semi-annual 2008 Groundwater Monitoring Report for Former Chevron, Texaco and Unocal bulk plants. Results are consistent with previous results. ARCADIS recommends eliminating PAH's analysis and VOC's. ADEC agrees but requires analysis for PCE/TCE. ADEC also agrees with wells GEI-8, GEI-9, K-7 and MW-2 to be sampled annually instead of semi-annually. Tamara Cardona-Marek
8/29/2008 Update or Other Action ARCADIS requests approval to transport waste soil resulting from installation of vapor probes. Transport approved although not necessary, all super-sack sample results were below cleanup levels. Tamara Cardona-Marek
12/18/2008 Update or Other Action ADEC received the Second Semi-annual 2008 Groundwater Monitoring Report for Former Chevron, Texaco and Unocal bulk plants. Results are consistent with previous monitoring events. 0.67 Ft of product were measured in well GEI-1. Benzene concentrations measured up to 5,530 ppb. Tamara Cardona-Marek
3/13/2009 Meeting or Teleconference Held ADEC discussed site with Arcadis and Chevron on 3/3/2009. ADEC requested that only one sampling event takes place this year and efforts are focused on developing graphs and plume maps that demonstrate contaminant reduction over time. MNA parameters should also be measured at the site during sampling events. Arcadis will do a Phase I assessment to determine if additional plume delineation to the west is needed. Tamara Cardona-Marek
1/22/2010 Report or Workplan Review - Other DEC reviewed the Annual 2009 Groundwater Monitoring and MNA Report. Well GEI-1 was not sampled due to the presence of LNAPL. Contaminant concentrations in MW-2 increased significantly from previous sampling events. DRO in GEI-4 also increased by an order of magnitude. Well GEI-11 was not sampled due to access issues that need to be resolved with ARRC. Tamara Cardona-Marek
2/17/2010 Meeting or Teleconference Held DEC met with Chevron and Arcadis to discuss 2010 activities. Additional plume delineation to the West of the property will be performed. The completion of a risk assessment is being evaluated and a plan will be submitted in 2010. Arcadis will perform a pilot-test for the use of surfactants to reduce free product presence. A workplan will be submitted for this work. Tamara Cardona-Marek
8/20/2010 Report or Workplan Review - Other Arcadis submitted work plan for pilot test to inject surfactant to recover free product in one of the wells. Work plan also included additonal wells for delineation of contamination. Both sections of the work plan have been approved. Tamara Cardona-Marek
7/20/2011 Report or Workplan Review - Other Arcadis submitted a work plan for additional site characterization . Work plan includes the installation of 12 soil borings on the Unocal property for screening and sampling at shallow and deep depths. Tamara Cardona-Marek
7/22/2011 Site Characterization Workplan Approved DEC approved the submitted work plan and clarifications for additional site characterization. Tamara Cardona-Marek
3/19/2012 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 71712 former tank and spills. Tamara Cardona-Marek
7/30/2012 Report or Workplan Review - Other DEC received and reviewed the 2012 Groundwater Monitoring Workplan submitted by Arcadis. 21 wells will be sampled annually. For monitoring purposes wells will be sampled will bailers. Tamara Cardona-Marek
8/28/2012 Meeting or Teleconference Held DEC met with Chevron and Arcadis to discuss actions for 2012-2013. An updated conceptual site model will be submitted that addresses exposure pathways and how they will be remediated or controlled. This will comprise the cleanup plan that is expected to be submitted in the Fall of 2012. Additional assessment will be completed near the surface soil contamination identified on the property. Tamara Cardona-Marek
4/29/2013 Meeting or Teleconference Held DEC met with Chevron and Arcadis to discuss the status of this and other sites. Shallow soil assessments indicate that contamination remains above cleanup levels in surface and sub-surface soils in several areas. Results of LNAPL fingerprinting indicate that product to the west (downgradient) does not match the product at the UNOCAL source area, however other potential sources have not been determined. Arcadis has indicated that air sparging is one likely remedial option that will be proposed at the site, however there is concern from Chevron that this will not take care of the DRO and they do not want to repeat cleanup efforts. Access of the property to the south should be granted this year. Additional delineation of the downgradient plume may be needed to the west; although wells exist to the south of this area, the there are no wells directly downgradient of groundwater contamination. Robert Burgess
5/14/2014 Meeting or Teleconference Held DEC met with Chevron and ARCADIS to discuss several Fairbanks-area sites. Chevron plans to install a remedial system consisting of air sparging and soil vapor extraction, and to remove the top two feet of contaminated soil in all accessible areas. DEC has approved the re-use of a system currently located at a different site (former Mike's Chevron) which no longer requires the system. Robert Burgess
9/16/2014 Cleanup Plan Approved After comment and revision, DEC approved the 2014 Remedial Design and Workplan for the site. Surface soils will be removed to a depth of 2 feet to the extent practicable, and an air sparge/soil vapor extraction (AS/SVE) system will be installed and operated seasonally. The AS/SVE system is designed to target lighter range petroleum compounds such as GRO and BTEX. Existing DRO will not be removed by the system and will be managed with institutional controls. Robert Burgess
9/25/2014 Site Visit DEC project manager visited the site to observe utility clearance trenching with a vactor truck and excavation work being conducted at the site. Robert Burgess
10/2/2014 Site Visit DEC project manager visited the site to observe installation of air sparge wells and to talk with Chevron and ARCADIS project managers. Robert Burgess
6/23/2016 Report or Workplan Review - Other DEC recommended Chevron dispose of the soil stockpile by September, 2016. The stockpile was generated during excavation and system installation work conducted in September, 2014. Robert Burgess
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
5/22/2017 Report or Workplan Review - Other A work plan for installing a wicking adaptor was reviewed and approved. The work plan outlines the installation of a wicking adapter into four soil vapor extraction wells to enhance the extraction of light non-aqueous phase liquid (LNAPL). These wells were selected based on the historic LNAPL trends. Installation of the wicking adapter is scheduled sometime between the end of May and the month of June. A photoionization detector will be used to monitor the performance of the adaptor at the site and analytical samples will be collected during the monthly operation and maintenance events. The contaminated wicking material will be collected monthly and prior to system winterization. Shawn Tisdell

Contaminant Information

Name Level Description Media Comments
Benzene > Table C Groundwater
DRO > Table C Groundwater
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
Ethylbenzene > Table C Groundwater
GRO > Table C Groundwater
Toluene > Table C Groundwater
Xylenes (total) > Table C Groundwater

Control Type

Type Details
Other The groundwater should not be used for drinking water (or any other purpose) on the site and those properties down-gradient (West) from it until such time that groundwater cleanup levels are achieved. If there is a groundwater well on a property, the water must meet regulatory cleanup levels . If contaminated soil is excavated or groundwater is encountered and must be discharged, DEC should be notified prior to any transport or discharge from the property.

Requirements

Description Details
Groundwater Use Restrictions The groundwater should not be used for drinking water (or any other purpose) until such time that groundwater cleanup levels are achieved. If there is a groundwater well on your property, the water must meet regulatory cleanup levels . If the groundwater exceeds the cleanup levels (as determined by approved water sample analysis), it should either be treated to meet those levels or the well should be decommissioned in accordance with ADEC procedures. The installation of any new groundwater wells should be coordinated with ADEC.
Excavation / Soil Movement Restrictions If contaminated soil is excavated or groundwater is encountered and must be discharged, ADEC should be notified prior to any transport or discharge from the property. Information regarding how the excavated soil is to be stored and/or transported and how groundwater will be contained and/or discharged should be provided to ADEC prior to transport or discharge.
Advance approval required to transport soil or groundwater off-site. Information regarding how the excavated soil is to be stored and/or transported and how groundwater will be contained and/or discharged should be provided to ADEC prior to transport or discharge.

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