Division of Spill Prevention and Response

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Site Report: Unocal - #5785- Airport Union


Site Name: Unocal - #5785- Airport Union
Address: 9190 Glacier Highway, Juneau, AK 99801
File Number: 1513.26.049
Hazard ID: 23568
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 58.363300
Longitude: -134.584800
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

Waste Oil Tank Removal on 8/25/97 showed remaining in ground contamination levels of DRO of 211 mg/kg and RRO of 317 mg/kg, non detect for BTEX, non-detect halogenated volatile organics, non-detect PCB's, 0.4 mg/kg lead; stockpile had 1,600 mg/kg DRO and 560 mg/kg RRO, non-detect HVO and PCB, 0.3 mg/kg lead.



Action Information

Action Date Action Description DEC Staff
8/25/1997 Underground Storage Tank Site Characterization or Assessment Waste oil UST removal (by Geo Engineers) * Not Assigned
10/9/1997 Site Added to Database * Not Assigned
10/9/1997 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77608 DEC receives 10/6/97 SA rept on waste oil UST removal of 8/25/97. There has been release of RRO and DRO. * Not Assigned
11/30/1998 Underground Storage Tank Site Characterization or Assessment Gasoline USTs piping removal & upgrade (by Gilfilian Engineering) * Not Assigned
5/21/1999 Update or Other Action SA rept received by DEC on removal/upgrade of piping conducted 11/30/98 * Not Assigned
7/23/1999 Leaking Underground Storage Tank Cleanup Initiated - Petroleum 4/10/99 SA rept reviewed. Rept indicates piping GRO release. Hydraulic lift RRO=1600 ppm & DRO 440 ppm. Excavated dump pit: found 22 intact batteries and many automotive parts. Pit cleanup has been accomplished. Contact by e-mail w/Schlichting re-CS portion of report. * Not Assigned
8/9/1999 Release Investigation DEC writes ltr in concurrence with RPCON's conclusion for RI & hydraulic fluid release to be handled by CS/Jnu. * Not Assigned
8/18/1999 Release Investigation DEC receives RI work plan fr RPCON. Work plan does not indicate drawings of where MWs will be installed * Not Assigned
8/20/1999 Update or Other Action RPCON requests that DEC communicate via e-mail re-work plan. DEC defers approval of RI work plan until diagram is submitted re-location of MWs, including location of existing piping as well as where former piping was removed. RPCON encouraged to make contact with CS/Jnu. * Not Assigned
9/15/1999 Update or Other Action Sent e-mail to RPCON re-status of diagram showing installation of MWs. RPCON: To be submitted end of 9/99 or early 10/99. Made contact w/CS/Jnu. * Not Assigned
9/17/1999 Update or Other Action Waste oil UST removal of 8/25/97 SA rept reviewed. 2 cu yds contam soil (temporary) stockpiled on-site. Need to determine final fate. * Not Assigned
10/6/1999 Update or Other Action DEC receives ltr w/backup documents from RPCON involved with 8/25/97 w/o UST removal. HOT & w/o UST located in same pit. Contam believed to be from HOT since w/o UST unused. 10/3/97 DEC Jnu ltr permitted contam soils to be thermally remediated. * Not Assigned
10/29/1999 Update or Other Action DEC receives RPCON's ltr & sketch of where (4) MWs will be installed plus response to CS comments. 11/1/99 DEC approves LUST addendum to 9/23/99 RI work plan via e-mail to RPCON * Not Assigned
12/8/1999 Update or Other Action Work plan approval given to RPCON by CS for their work plan. Field work to begin 1st quarter of 2000. Assume LUST/CS will be worked together at that time. * Not Assigned
12/8/1999 Update or Other Action This is LUST/CS combination site. CS called Mike's Airport Express. Bill Janes
8/15/2001 Update or Other Action Approval to transport 150 cy of contaminated soil to USR facility in Juneau given to Gilfillian Engineers by Paul Horwath. Bill Janes
10/2/2001 Update or Other Action Changed Project Manager from Colin Basye to Bruce Wanstall Cynthia Pring-Ham
11/16/2001 Update or Other Action Routine gw monitoring. Next one scheduled for December. Release investigation for heavy metals on site. Release from adjoining property . Will be getting a report on the heating oil AST on west side of station. Another round of monitoring. Complete a NFRAP by second quarter. Confirm the CSM. Problems at site - remaining GRO and benzene above Table C. Heavy metals in trace amonts with several metals above Table C. Most are below the 10 x level. Does not appear off site migration has occurred but no wells are currently off site. Kris sending a package that shows a downward concentration trend in most of the wells ( First quarter). Workplan Bill Janes
12/19/2001 Update or Other Action GW monitoring. Met on site with Gilfilian Engineering and Robert Reges, attorney for Holloway, to discuss site issues. Bill Janes
1/22/2002 Update or Other Action July monitoring report reviewed. Benzene and DRO, RRO table C levels exceeded in some wells. Also lead, chromium, arsenic, vanadium. Bill Janes
2/20/2002 Update or Other Action December gw monitoring report reviewed. Benzene, GRO, DRO showing up in monitoring well G-9. Filtered metal samples came up ND, indicating that previous hits were from suspended sediment. Bill Janes
6/20/2002 Update or Other Action Well search amendment report received this date.Numerous inactive wells in area. Four active wells identified. No wells downgradient of site (south-southwest) Bill Janes
11/1/2002 Update or Other Action 5/20/02 ust piping upgrade assessment reviewed. Email to Gilfilian asking if results of pilot SVE effort are in. Bill Janes
11/1/2002 Update or Other Action March 02 gw monitoring report reviewed. Benzene, GRO, DRO showing up above Table C in several wells. MW G-9 levels the highest to date. Filtered metal samples came up ND, indicating that previous hits were from suspended sediment. Emailed Kris Iverson rgd status. New Tesoro site manager is Peter Ribbens. Bill Janes
11/13/2002 Update or Other Action File review Bill Janes
11/27/2002 Update or Other Action Web conference with Montgomery Watson Harza staff Ivarson and Gilfilian and Peter Ribbens from Tesoro to discuss next year's workplan. Bill Janes
8/22/2003 Update or Other Action Approval to transport four drums of contaminated soil to Alaska Soil Recycling in Anchorage Bill Janes
9/18/2003 Update or Other Action November 02 gw monitoring report reviewed. Benzene consistently elevated in G-1. Also elevated above cleanup levels in G-11 and G-13. Significant decrease in G-9. No metal hits in any of the wells Bill Janes
12/3/2003 Update or Other Action Meeting with Tesoro and consultant to discuss 2004 workplan for site. SVE installed 10/03. Two new monitoring wells and air sparge system proposed for 04. Bill Janes
1/15/2004 Update or Other Action June 03 gw monitoring report reviewed. Benzene elevated above cleanup level in G-1, G-9, G-11, G-12, G-13. GRO and DRO elevated in G-9. No metal hits in any of the wells Bill Janes
1/20/2004 Update or Other Action Final 2004 workplan received. Bill Janes
4/6/2004 Update or Other Action Oct 03 gw monitoring report reviewed. Benzene has increased in G-1 again. Benzene also elevated above cleanup level in G-11 and G-15. No GRO or DRO elevations any longer. Soil vapor extraction system seems to be working as engineered. Air sparge pilot study results provided enough data concerning the viability of the wells to move forward with a permanent system installation if needed. Bill Janes
9/15/2004 Update or Other Action February 04 GW monitoring report reviewed. Benzene above cleanup level in G-1, G-9, G-11. GRO slightly elevated above cleanup level in a duplicate from G-11. Contaminants continue to fluctuate generally with the water table. Bill Janes
10/27/2004 Update or Other Action Reviewed Sept 04 GW monitoring report for June monitoring. Benzene plume appears to be migrating from the site in a southwest direction. Appears to be attenuating before reaching Duck Creek. RP's consultant directed not to install new monitoring well as proposed in NW corner of FAA property. Plume is not going in that direction. Bill Janes
11/19/2004 Update or Other Action Telecon with Tesoro and MWH to discuss next year's workplan. Sampling from monitoring wells G-12 and G-14 will be terminated. DRO will not be collected in any wells except G-9. One more round of monitoring all wells for all parameters to occur this year. Bill Janes
3/9/2005 Update or Other Action Reviewed 2005 final workplan received Jan 24. Reviewed March 2 2005 gw monitoring report for November gw monitoring. Benzene has increased in G-1 compared to past data. Correlated with seasonal fluctuation in static gw table. Benzene down in all other wells compared to June 2004 data. Bill Janes
12/6/2005 Update or Other Action Telecon with Tesoro project manager and consultant to discuss next year's draft work plan. Semi-annual monitoring and SVE operation to continue. Off-site benzene plume appears to be attenuating according to June and October 05 sampling. Benzene and GRO still elevated in G-1 in particular. Bill Janes
2/2/2006 Update or Other Action October 2005 monitoring report received. Bill Janes
7/10/2006 Site Visit Site visit w/ Michael Zidek of MWH Anch. Discussed site history and current data trends while he sampled monitoring wells and performance-checked the SVE system. Daniel Fremgen
9/25/2006 Update or Other Action July 2006 monitoring report received. Benzene above cleanup level in G-1 only. Ethylbenzene, toluene, GRO increased in G-9 since Oct. 05 sampling event, but are still well below cleanup levels. Bill Janes
11/22/2006 Update or Other Action CR check received by Law - $200.27 Bill Janes
1/24/2007 Update or Other Action Telecon with MWH on the draft 2007 workplan submitted Nov. 06 Monitoring to continue 2nd and 4th qtr. Conditional closure potential will be explored 2nd quarter when sampling results are received. SVE to be turned off for 90 days and then a rebound test conducted. Plan for addressing area around G-1 where benzene in gw is significantly elevated will be proposed. Bill Janes
2/1/2007 Exposure Tracking Model Ranking ETM Baseline Ranking completed 1/07 SVE system appears to be reducing petroleum contaminant levels in GW monitoring wells. Levels in off-site wells are below detection limits; one on-site well has persistent amounts of benzene above cleanup levels. Daniel Fremgen
2/7/2007 Update or Other Action November 3 monitoring report received this date. Benzene at 0.0304 mg/L in G-1 and 0.00658 in G-11. Cleanup level is 0.005 mg/L. SVE system still operating. Bill Janes
8/23/2007 Update or Other Action August 2007 monitoring report received for the May 2007 event. Results indicate that dissolved hydrocarbons above cleanup levels remain in the immediate vicinity of the UST system. The remediation system will remain in operation to address soil and groundwater impacts. GW sampling will be continued to evaluate the effectiveness of remediation. Bill Janes
1/16/2008 Update or Other Action Teleconference held with MWH and Tesoro to discuss groundwater plume trend and possible conditonal site closure this year. Bill Janes
10/6/2008 Report or Workplan Review - Other Received Summary Report and Request for Conditional Closure from Tesoro. After review of this report, a cleanup complete determination will be considered. Evonne Reese
11/2/2008 Report or Workplan Review - Other Reviewed Summary Report and Request for Conditional Closure dated 9/30/08. Petroleum contamination associated with the groundwater has been reduced considerably at this site. Contamination in the groundwater has not been detected or has been below Table C levels in all but two of the monitoring wells in all events covering the last three years. Benzene levels in G-1 was 0.0095 mg/kg and in G-11 was 0.0211 mg/kg. Low levels of volatile hydrocarbons observed in a rebound test of the soil vapor extraction system indicate that this treatment is no longer effective; therefore the treatment has been discontinued. An updated ETM ranking should be done for this site and then closure considered. Evonne Reese
11/3/2008 Exposure Tracking Model Ranking A new updated ETM ranking has been completed for source area UST. Evonne Reese
3/25/2009 Cleanup Complete Determination Issued Evonne Reese
3/25/2009 Institutional Control Record Established Institutional Controls established and entered into the database. Bill Janes
5/20/2009 Site Visit Site visit in order to observe some of the monitoring wells being decommissioned and to take photos of the process. Decommissioning report will follow from MWH. Evonne Reese
7/23/2009 Update or Other Action Received Monitoring Well/Remediation System Decommissiong Report from MWH. Evonne Reese
12/4/2013 Institutional Control Compliance Review IC compliance review conducted. Groundwater monitoring requirements have been discontinued. Reminder system set for March 2014 to verify that the contaminated soil remains covered with asphalt or concrete. Evonne Reese
8/1/2014 Institutional Control Update An IC reminder letter was issued to the responsible party on this date. Kristin Brown

Contaminant Information

Name Level Description Media Comments
Benzene > Table C Groundwater At the time of closure benzene levels were above Table C levels in two onsite monitoring wells.


Control Type

Type Details
Notice of Environmental Contamination (Deed Notice) This site is included under the deed notice filed for another contaminated site (Mike's Airport Express) located at this same facility. The deed notice was filed in 2002 in the Juneau Recording District, Book 0560, Page 423


Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.
Groundwater Use Restrictions Groundwater wells shall not be installed on this property without prior approval by DEC.
Other Every five years, beginning March 2014, DEC will contact the owner of the facility to document that residual soil contamination remains capped by pavement and that no groundwater wells have been installed on the property.