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Site Report: Unocal Bulk Plant Fac. 0745

Site Name: Unocal Bulk Plant Fac. 0745
Address: 44604 Sterling Highway, Soldotna, AK 99669
File Number: 2333.38.016
Hazard ID: 455
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 60.480833
Longitude: -151.076111
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

Reported to ADEC on 05/23/88. The soil at the site is contaminated with diesel fuel and gasoline. This property had been the site of a bulk fuel storage and sales business for 18 years. Excavation revealed diesel saturation at a 3' depth. Groundwater contamination suspected. Extent of contamination and health impact unknown. Site is reported to have been part of the old Soldotna Airport. Fuel lines still exist on property. Several prior owners of this site were offered the opportunity to assume responsibility for the contamination and begin assessment and cleanup work. Union Oil Company, the primary prior owner, then committed to undertake subsurface assessment efforts at this site. Formerly known as Sterling Highway Mile 95. Last staff assigned were Haley, Munger and Horwath.

Action Information

Action Date Action Description DEC Staff
5/23/1988 Update or Other Action (Old R:Base Action Code = FI - Field Inspection (General)). Excavation reportedly encountered contaminated soil and ADEC was contacted. Soil samples were collected by ADEC. Samples exhibited TPH up to 2000 ppm, quantified as diesel. Former Staff
2/15/1990 Update or Other Action (Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). RZA submitted QA/QC plans and assessment scope of work for site to ADEC on 2/15/90. Final plans approved on 3/21/90. Former Staff
3/21/1990 Site Characterization Workplan Approved RZA submitted QA/QC plans and assessment scope of work for site to ADEC on 2/15/90. Final plans approved on 3/21/90. Donald Seagren
4/5/1990 Update or Other Action (Old R:Base Action Code = MS - Monitoring/Sampling). Field work performed from 4/5/90 to 4/7/90. Report submitted on 6/1/90. Field work included 8 soil borings, 5 of which were completed as monitoring wells. 4 of 8 soil borings exhibited total BTEX greater than 10 ppm and 6 of 8 had TPH up to 323 ppm. 4 of the 5 monitoring wells had total BTEX up to 268 ppb (no benzene), and all 5 exhibited TPH up to 702 ppm, quantified as both gasoline and diesel. Former Staff
12/10/1990 Site Ranked Using the AHRM Initial ranking. Former Staff
1/1/1992 Site Added to Database Diesel fuel, gasoline, and groundwater contamination. Former Staff
12/13/1993 Update or Other Action (Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Reviewed draft corrective action plan and drafted comment letter to Unocal. Former Staff
1/10/1994 Update or Other Action (Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Reviewed proposed corrective action plan and sent response for changes to plan to Unocal. Former Staff
1/11/1994 Update or Other Action (Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Reviewed corrective action plan and sent a letter requesting additional information prior to approval. Former Staff
1/11/1994 Update or Other Action (Old R:Base Action Code = MS - Monitoring/Sampling). Review quarterly monitoring report Former Staff
6/20/1994 Update or Other Action (Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Reviewed additional site assessment plan and discussed it in a meeting with the RP and consultant on 6/22/94. Plan was approved in the meeting. Written approval pending ADEC receipt of revised plan. Donald Seagren
7/11/1994 Update or Other Action (Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Reviewed and approved a workplan for additional site assessment work. Former Staff
8/3/1994 Update or Other Action (Old R:Base Action Code = FI - Field Inspection (General)). Site inspection during site assessment sampling and excavation test pits. Former Staff
7/19/1995 Update or Other Action (Old R:Base Action Code = FI - Field Inspection (General)). Meeting held at KDO to discuss risk assessment and setting alternative cleanup guidelines followed by site inspection. Donald Seagren
4/5/1996 Update or Other Action Reviewed a Risk Assessment Workplan. Waiting for comments from the term contractor prior to contacting UNOCAL and Geo-Engineers. Donald Seagren
7/2/1996 Update or Other Action Reconstructed and issued comment on the risk assessment work plan for the RP's response. Donald Seagren
6/23/1999 Update or Other Action Approved ground water recovery plan. Plan will investigate product on water table that was found recently. Risk assessment approval on hold. Donald Seagren
8/24/1999 Update or Other Action Reviewed GW recovery results and report. Donald Seagren
10/1/1999 Update or Other Action Reviewed Quarterly GW Monitoring Report. Donald Seagren
2/8/2000 Update or Other Action Reviewed Quarterly GW Monitoring Report; MW 8 and 9 still have floating product; Discussed potential plans with Scott Widness - GeoEngineers - they are still discussing, but are leaning towards some site excavation and thermal remediation either locally or in Anchorage. Donald Seagren
6/7/2000 Update or Other Action Sent letter suggesting Unocal meet with new owner to discuss plans and come to agreement prior to developing work plan for ADEC approval. Also stated that new site work may change some of the assumptions in the risk assessment. This would have to be corrected prior to the risk assessment moving forward. Donald Seagren
6/26/2000 Update or Other Action After discussing needs with KPB assessor, I sent Chuck Kim a letter stating that ADEC does not require financial information in a Phase II Site Assessment. We can provide data on contaminant levels and distribution. They need to contact Unocal for financial information regarding cost of site cleanup. Donald Seagren
8/1/2000 Meeting or Teleconference Held Met with RP to discuss proposed workplan for excavation and remediation of contaminated soils. Discuss time frames for possible resumption of review of Risk Assessment. Will depend on success of removing free product from groundwater. Donald Seagren
8/14/2000 Cleanup Plan Approved Approved work plan for soil excavation, MW abandonment and limited additional assessment. Donald Seagren
9/11/2000 Update or Other Action Site inspection at start of work. Met with Lou Oliva and briefly discussed work schedule. Donald Seagren
9/12/2000 Update or Other Action Talked on the phone with Doug Loushbaugh concerning remediation activities at site. Also discussed the site activities with Jim Butler, attorney for Chuck Kim. Donald Seagren
9/13/2000 Update or Other Action Site inspection to observe remediation efforts. Discussed site work with Doug Loushbaugh, Peninsula Clarion. Donald Seagren
9/19/2000 Update or Other Action Daily site inspections during the excavation process. Sunday the only day not working. This phase should be concluded later today with the excavations backfilled with clean overburden. Donald Seagren
10/4/2000 Update or Other Action Site inspection with Scott Widness of Geo-Engineers. Selected locations for re-installation of 4 MWs, discussed fencing, and removal of remaining contaminated soils and solid waste. Donald Seagren
3/28/2001 Update or Other Action Conference call with Unocal and GeoEngineers regarding site cleanup and letter from attny. Further discussion with Attny. for potential property owner. Discusion wth City of Soldotna about their concerns for the site - want to be kept informed. Donald Seagren
4/3/2001 Meeting or Teleconference Held Meeting with 2 lawyers for potential owner to discuss status of site investigation/remediation, potential liabilities for their client, possible contaminant migration pathways, NFA vs Closure status, LTM, etc. Donald Seagren
4/6/2001 Update or Other Action Discussed the site with Robert Ruffner, Alaska Watershed Forum. Donald Seagren
4/9/2001 Update or Other Action Sent letter to Unocal and GeoEngineers pointing out areas of the risk assessment that will need updating prior to re-submittal Donald Seagren
5/31/2001 Update or Other Action Review Quarterly Monitoring Report, March 2001 Donald Seagren
10/11/2001 Update or Other Action Reviewed Quarterly Ground Water Monitoring and Sampling Report, June 2001. Donald Seagren
1/2/2002 Update or Other Action Reviewed September 28, 2001 monitoring report. Sheen found in 3 MWs but no measurable free product. MWs last sampled in late December 2001. Report in progress. After a review, a meeting will be held between ADEC and principle parties to determine course of action for remediation/closure. Donald Seagren
1/30/2002 Meeting or Teleconference Held Teleconference between ADEC, Unocal and GeoEngineers concerning how to proceed. GeoEngineers will develop a report analyzing the monitoring data to date and determining the status of the plume. Another meeting will be convened to discuss and finalize whether to update the RA or use Method 3. The present GW monitoring will continue until the monitoring summary/analysis report is approved. Unocal will be coordinating with current landowner. Donald Seagren
3/1/2002 Site Characterization Workplan Approved Reviewed and approved work plan for additional site characterization. 2 additional soil borings/MWs will be installed across the sterling Highway from the site to assess extent of migration of contaminant plume. Donald Seagren
3/12/2002 Update or Other Action Site inspection during additional MW installation. Donald Seagren
3/13/2002 Update or Other Action Review December 01 monitoring report. Donald Seagren
5/3/2002 Site Characterization Report Approved Reviewed Summary Report for Soil Borings and Monitor Well Installation, dated 1 May 02. No soil contamination detected exceeding ADEC cleanup levels. Drummed soil cuttings approved for on-site disposal. Awaiting quarterly GW monitoring report to make determination on drummed purge water. Donald Seagren
5/17/2002 GIS Position Updated Heather Goldman supplied updated latitude and longitude based on a report prepared for the Kenai River Special Management Area. Heather Goldman
5/22/2002 Update or Other Action Reviewed Quarterly monitoring report. Discussed results with Scott Widness of GeoEngineers. Donald Seagren
8/1/2002 Update or Other Action Reviewed monitoring report, June 02. sent request to for future reports to report analytical results the same regs, i,e, mg/l not ug/l for BTEX. Donald Seagren
12/12/2002 Update or Other Action Reviewed 11 December 02 monitoring report for 17 September 02 sampling event. Donald Seagren
3/18/2003 Update or Other Action Reviewed and approved request to change LTM from quarterly to semi-annual sampling. also approved deletion of PAH and dissolved lead sampling at selected monitor wells. Donald Seagren
6/25/2003 Update or Other Action Sent risk assessment review comments to Unocal and GeoEngineers for response. Also suggested response to comments form attorney for current landowner. Donald Seagren
2/26/2004 Update or Other Action File number assigned and entered into the Fileroom DB and CS DB. Alyce Hughey
4/27/2004 Update or Other Action Requested a copy of the Remediation and Indemnification agreement between Unocal, City of Soldotna and Chuck Kim DBA Denali Properties and Q-1 Enterprises as a public record request from City of Soldotna. Donald Seagren
5/4/2004 Update or Other Action Contact Project Manager changed to Robert G. Shipley, Jr., Unocal Alaska/Union Oil Company of California. Donald Seagren
5/10/2004 Update or Other Action AG sent letter to Dennis Acker, attny for Denali PropertiesII (landowner) requesting copy of remediation and indemnification agreement. Donald Seagren
6/10/2004 Update or Other Action Sent draft ROD for use of 10X rule to establish ACLs to Frechione and Swiderski for review and approval. Donald Seagren
7/6/2004 Update or Other Action Reviewed April 04 monitoring report. Conditions similar to previous reports. Plume does not appear to be expanding. Donald Seagren
8/11/2004 Update or Other Action Public notice to be published 15-17 August 04. End of comment period 1 September 04. Commissioners office notified of the public notice. Donald Seagren
8/25/2004 Update or Other Action Received publishers affidavit for publishing the of the public notice. Donald Seagren
9/7/2004 Update or Other Action Public comment period on proposed ACLs has ended with no comments. One phone call received from a salesman for a remediation firm. Referred caller to Bob Shipley, Unocal. Donald Seagren
9/10/2004 Cleanup Level(s) Approved Alternative soil and groundwater cleanup levels were approved by ADEC, as documented in the September 10, 2004, ADEC Record of Decision. Paul Horwath
9/10/2004 Update or Other Action Notice of Environmental Contamination and Record of Decision finalized and issued. Unocal is working to file the Notice of Environmental Contamination with the property deed in the Kenai Recorders Office. Donald Seagren
9/21/2004 Update or Other Action Coordinated with AG's office on approval of changes to deed notice proposed by Marc Bond, Unocal attorney. Donald Seagren
11/23/2004 Update or Other Action Reviewed October 2004 monitoring report. Cleanup levels exceeded only in two wells (MW-14 & MW-15) for benzene.HVOCs have not exceeded Table C cleanup levels at the sit since July 2000. No significant changes to impacts to human health and the environment have been identified since the last monitoring report. Unocal needs to develop a long term monitoring plan as a condition of the Record of Decision. Donald Seagren
12/13/2004 Long Term Monitoring Established After discussion with GeoEngineers & Unocal, a conditional approval was issued for the long term monitoring work plan. Due to DRO contamination, MW3 & MW5 will be retained in the monitoring program. MW16 will be retained in the monitoring program as the downgradient most monitor well within the property boundaries. MW 19 will be substituted for MW 18, as it is more in line with groundwater flow direction on the site. The monitoring program will be reviewed annually for any refinements. Donald Seagren
1/5/2005 Update or Other Action Contacted Bob Shipley, Unocal, about not receiving verification of the deed notice being filed. Upon checking further, he found that it was sent to the property owner, but has not been returned signed yet. He will check further and get it filed. Donald Seagren
2/15/2005 Institutional Control Record Established Notice of Environmental Contamination received from Unocal. The Notice was recorded on the property deed in Kenai Recorders Office. Donald Seagren
8/10/2005 GIS Position Updated Using Figure 1 from a Revised Risk Assessment, Former Bulk Fuel Facility, from GeoEngineers, dated May 6, 2003, in conjunction with TopoZone Pro and the KPB Parcel Lookup, entered the coordinates for this site. Metadata includes No Topo Basemap, TopoZone Pro Street Map, Black and White Aerial Photo, on a Medium Size Map, View scale 1:10,000, Coordinate Datum NAD83. High degree of confidence in accuracy of location. Alyce Hughey
10/4/2005 Update or Other Action Reviewed annual GW monitoring report. 6 MWs that have historically had contaminatin levels lleow Table C cleanup levels wee abandoned. ACL exceedances in MW 14, 15 & 19. MW19 is across the street from the site. DRO contaminantion in this MW may not be directly related to this site. Further assessment and analysis of the probable contaminatn source will be providned in the next annual report. No appreciable change in the risk to human health and the environment. Donald Seagren
3/8/2006 Update or Other Action Received site development plans from architect. Sent a copy to Chevron. Coordinated comment review and response action related to site contamination bewteen Chevron and developer. Site work to begin after breakup. Donald Seagren
5/10/2006 Update or Other Action Approved abandonment of all monitor wells at the site. The MWs are being abandon after the Spring 06 monitoring event, due to construction activities in 06. Upon completion of the construction the site will be re-evaluated and monitor wells and LTM program re-esatblished. Donald Seagren
5/31/2006 Update or Other Action Review and approve Excavation Oversight Workplan prepared by Cambria Environmental Technology, Inc. working for Chevron Donald Seagren
6/9/2006 Update or Other Action Site inspection in response to call from Dan Glaze. Pocket of highly contamianted soil discovered in former tank farm area. Contamination appears to be bound up in the silty soil & organic matter that was used to fill in the site. Strong petroleum odor very evident when driving by site. Approximately 1600 yds3 stockpiled on site. Discussed options of haluing directly to ASR, combining into asphalt and disposal at KPB landfill. Gave reqirement for asphalt incorporationa dn KPB disposal reequirements to Dan. Suspect it will not meet KBP requirements for diposal. May also be too silty, without screening, for combinaiton into asphalt. Will return in afternoon when asphalt contractor is on site to answer any questions. Will provide guidanc efor oversize materials. Donald Seagren
6/19/2006 Update or Other Action Reviewed stockpile characterization data. Approved transport of approximately 1,600 yds3 of petroleum contaminted soil to ASR in Anchorage for thermal remediation. Donald Seagren
6/20/2006 Update or Other Action After approving a work plan to haul the contaminated soil to ASR for thermal treatment, Cambria now wants to change the plan and turn the contaminated soil into asphalt. I went over the requirements with Dan Glaze. I particularily pointed out the requirement for certification by an engineer registered in the State of Alaska that the process incorporating the contaminated soil meets current industry standards. Awaiting the changed work plan and supporting information. Donald Seagren
6/21/2006 Update or Other Action Site inspection. Discussed work plan requirements for utilizing contaminated soil in apshalt paving project with Dan Glaze. Soil screening on-going. Oversize material will be utilized on site. Preliminary excavation analytical results show remaining contamination below ACLs established in 04 ROD. Most are also below Table B cleanup levels. Have not received any data back for the hot spot excavation where the former ASTs were located. One stockpile sample exceeded ACLs. The rest were between ACLs and Table B levels. Informed Dan that they must excavate all contamination exceeding ACLs and preferrably anything exceeding Table B. Donald Seagren
6/22/2006 Meeting or Teleconference Held Met with Paul Davis, attorney for Chuck Kim, landowner. Discussed the site history and on-going cleanup actions. he worked with Alyce Hughey on reviewing the file and getting copies made. Donald Seagren
6/26/2006 Update or Other Action review and approve second request to transport 1600 yds3 of contaminated soil to Alaska Soil Recycling in Anchorage for thermal remediation and disposal. Donald Seagren
7/11/2006 Update or Other Action Environmental site activiites related to preparing the site for cinstruction were completed about 7 July 06. The contaminated soil is temporarily stockpile dat the former Chevron Refinery in Nikiski until mid to late August 06, when SPI will come to the site and thermally treat the soil. A site inspection will be conducted with Stacie Hartung-Frerichs the week of 17 July 06. Donald Seagren
9/22/2006 Update or Other Action Approve SPI operations plan to thermally treat approximately 1400 yds3 of petroleum contaminated soil at the former Chevron refinery site in North Kenai. Additional petroleum contamianted soil from two other sites under Chevron's control will also be thermally remediated after the Unocal Bulk Plant soils are done. Donald Seagren
9/22/2006 Update or Other Action Reviewed 06 Remedial Action Report. Provided review comments and questions. Contaminated soil remains at the site in 2 locations at levels between Table B1 & B2 (required for site closure) and the approved ACLs. The GW monitoring wells will be re-installed to ensure the construction activiites have not caused any contaminant migration. Annual monitoring will continue until 2 consecutive sampling events show that all constituent levels in all MWs are below Table C cleanup levels. Donald Seagren
9/25/2006 Update or Other Action Reviewed LTM & Well abandonment report. MWs were sampled prior to construction beginning. All MWs except for 11 & 19 were temporarily abandoned so as not to hinder site development/construction activities. Opon completion of construction, the MWs will be reestablished and the LTM program re-instated. this will most likely occur in spring of 07. Donald Seagren
10/4/2006 Update or Other Action Received a hard copy of the SPI Operations Plan for thermal remediation of contaminated soils currently located at the former Chevron Renifery in Nikiski. The plan is file din the Chevron Refinery file since the operations are on the former refinery site and SPI will be treating refinery soils after completion of the Unocal Bulk Facility soils. Donald Seagren
10/5/2006 Update or Other Action Reviewed 06 remedial activities supplemental report. 49.55 tons of contaminated soil were transported to ASR in Anchorage for thermal treatment and disposal. A GW monitoring program will be developed this winter for implementation in spring 07. MWs will need to be placed downgradient of the 2 remaining contaminant areas to capture any contaminant migration. Chevron will need to meet Table B1, B2 & C levels for full site closure. Donald Seagren
1/2/2007 Update or Other Action Reviewed interim thermal treatment report. Approximately 2/3of the 1,400 yd3 contamianted soil stockpile was treated during 2006. Post treatment analyis shows all contamiants belwo ADEc cleanup levels. Processing of the remaining 500 tons of untreated soil will be completed during 2007. Once all soil is successfully treated a final report will be submitted. Treated soil will be disposed of at the former Chevron Refinery in North Kenai. Donald Seagren
2/12/2007 Exposure Tracking Model Ranking Donald Seagren
4/3/2007 Update or Other Action Reviewed September 06 LTM report. Only 2 MW (11 & 19) currently remain after the site development in 2006. Once site development is completed after breakup in 07, monitor wells decommissioned so as not to hinder constrtuctions activities will be re-esatblished. ADEC will review the soil data and previous monitoring reports and work with Chevron to develop a groundwater monitoring plan. All the previous MWs will not be re-established. It is anticipated that only downgradient MWs will be re-established. Donald Seagren
6/13/2007 Update or Other Action Revewed and approved the Well Installation Workplan dated 13 June 07. All the previous on-site MWs were removed during site development in 2006. Additional contaminated soil was removed during site development. 3 MWs will be re-installed in the downgradient corner of the site to monitor any residual contamiantion that may remain. Site closure will be considered once 2 consecutive monitoring events shows that all contaminant levels are below Table C standards. Donald Seagren
8/7/2007 Update or Other Action approved transport of 5 - 55 gallon drums of soil and 2- 55 gallon drums of purge water form monitor well installtion. Post treatment soil samples to be analyzed for DRO, GRO & BTEX. Teh soils will be treated at ASR. The water will be treated by Emerald Alaska Donald Seagren
9/10/2007 Update or Other Action Reviewed GW monitoring report from 27 June 07. MW11 had exceedances for DRO (right at cleanup level) and Benzene. MW20 (a new MW) esceeded for DRO while MW21 and MW 21d (new well and dulpicate) had exceedances for DRO, GRO & Benzene. This was to be expected right after site development activities and installation of the new MWs. One new MW still ahs not been drilled due to site access difficulties. It is anticipated that this MW will be installed in late September 07. Donald Seagren
9/13/2007 Update or Other Action telephone call from John Riggi. Due to the inability of the attornies for the landowner and Chevron to come to agreement on a site access agreement, the drilling of the remaining MW and sampling of the MWs has been postponed until sometime in October. This will push back the original time frame for sampling of the monitor wells and the eventual site closure decision. Donald Seagren
10/10/2007 Update or Other Action Telephone call from John Riggi. The battle between the lawyers for the site owner and Chevron continues. Due to not having a site access agreement andd the lateness of the season, the final MW will not be installed until Spring 08. The ironic part it that the hole for the MW has already been drilled, btu due to site access delays and scheduling, it wasn't able to be installed when the other 2 were installed. They are hooping to be able to obtain site access to sample the existing MWs yet this year. The site access delays are delaying the sampling program and the ability to close the site. Chevron will be appointing a new projec tmanager due to staff promotions & reassignments. Donald Seagren
1/10/2008 Update or Other Action reviewed the 2nd 07 Gw monitoring report. Due to continuing site access problems, only 2 off-site MWs were sampled. Sampling just these 2 MWs will not lead to site closure. It was suggested to Chevron that until site access concerns are resolved so that they are able to install the remaining MW and are able to sample all 5 MWs during each sampling event, they may temporarily change to annual monitoring of the 2 off-site MWs. Once site access is resolved and they are able to sample all 5 MWs, then they will have to conduct semi-annual monitoring of all 5 MWs, which will lead to site closure. Donald Seagren
3/4/2008 Update or Other Action reviewed Well Installation Report dated 26 February 08. It documents the installation of MW 20 & MW21. MW MW 22 could not be installed dyue to time constraints and subsequent site access concerns. The site acceess issue have been on-going since June 07. Once MW 22 is installed the monitoring program leading to clsousre can begin. Soil contamiantion at 10'bgs was found in MW 21 samples. The DRO, GRO & benzene contaminaiton levels were above Table B levels but below the ACLs listed in the ROD. Donald Seagren
3/6/2008 Update or Other Action Met with Chevron & consultant. site access agreemnet still a problem. They hope to have it resolved during the Spring of 08. Until they have site access and can install the last MW and sample all 5 MWs, they were informed that may delay any further samplig. Sampling the 2 off-site MWs will not provide us additional useful information. Once sampling begins, they will be conducting quarterly sampling to obtain data to evaluate the potential for site closure. Donald Seagren
5/6/2008 Update or Other Action approved work plan for installation of last monitor well on the site. OIbtaining a site access agreement from the current property owner has delayed this project since the laste summer of 2007. Donald Seagren
6/11/2008 Update or Other Action Site transferred from Don Seagren to Paul Horwath per Linda Nuechterlein. Alyce Hughey
12/3/2008 Update or Other Action Reviewed the First Semiannual 2008 Groundwater Monitoring Report, dated September 15, 2008 from Conestoga-Rovers & Associates for Paul Horwath and provided him a summary for his review and oversight. Site conditions remain stable. The overall trend is showing that the groundwater concentrations are decreasing in all the monitoring wells that have previous monitoring events performed; however, the new monitoring well, (the proposed location is located next to the former pump island) which was installed during the June 2008 Site Assessment Activities, named MW-22, needs to be watched in future monitoring events. Benzene was detected above the Alternate Cleanup Levels during this monitoring event, and GRO and DRO was tested above the groundwater cleanup levels. Alyce Hughey
1/27/2009 Update or Other Action Reviewed the Second Semiannual 2008 Groundwater Monitoring Report, dated December 16, 2008 from Conestoga-Rovers & Associates for Paul Horwath and provided him a summary for his review and oversight. Site conditions remain stable. The overall trend is showing that the groundwater concentrations are decreasing in all the monitoring wells. The new monitoring well MW-22, which was installed during the June 2008 Site Assessment Activities showed a decrease in concentrations during this monitoring event, however, they remain above the alternate cleanup levels for Benzene, and above the groundwater cleanup levels for GRO and DRO. Alyce Hughey
12/16/2009 Document, Report, or Work plan Review - other Reviewed the First Semiannual 2009 Groundwater Monitoring Report, dated November 6, 2009, from Conestoga-Rovers and Associates for Paul Horwath. The site is remaining stable with a continual decline in groundwater concentrations. During the May 2009 sampling event MW-22 which showed Benzene concentrations above the alternate cleanup levels during the 2008 sampling events, tested above the groundwater cleanup levels during the May 2009 sampling event. However, the field duplicate sample taken of MW-22 did detect Benzene concentrations above the alternate cleanup levels. Semiannual groundwater monitoring and sampling will continue in order to evaluate the groundwater conditions at the site. Alyce Hughey
2/3/2010 Document, Report, or Work plan Review - other Reviewed the Second Semiannual 2009 Groundwater Monitoring Report, dated December 30, 2009, from Conestoga-Rovers & Associates for Paul Horwath. The site is remaining stable with a continual decline in groundwater concentrations. During the September 2009 sampling event MW-22 showed Benzene concentrations above the alternate cleanup levels, and DRO tested above the groundwater cleanup levels. The only other monitoring well detecting concentrations above the groundwater cleanup levels was MW-21, and with all the other monitoring wells testing below the groundwater cleanup levels. Conestoga-Rovers & Associates proposes quarterly groundwater sampling in 2010 to obtain the additional data needed to evaluate the site for cleanup complete. Alyce Hughey
7/22/2010 Document, Report, or Work plan Review - other Reviewed the First Quarter 2010 Groundwater Monitoring Report, dated June 23, 2010, from Conestoga-Rovers & Associates for Paul Horwath. The groundwater quality at the site is remaining consistent with the previous sampling events. During the March 2010 sampling event MW-22 showed Benzene concentrations above the alternate cleanup levels, and GRO and DRO tested above the groundwater cleanup levels. The only other monitoring well detecting concentrations above the groundwater cleanup levels was MW-21. MW-20 was not sampled because the well could not be accessed due to snow melt. Quarterly groundwater sampling will continue in 2010 in order to obtain additional data needed to evaluate the site for a cleanup complete determination. Alyce Hughey
12/21/2010 Document, Report, or Work plan Review - other Reviewed the Second Quarter 2010 Groundwater Monitoring Report, dated November 3, 2010, from Conestoga-Rovers and Associates for Paul Horwath. The groundwater quality at the site has remained consistent with the former sampling events over the past couple of years other than some slight increases from the March of 2010 sampling to the June 2010 sampling. Monitoring well MW-22 showed Benzene concentrations above the alternate cleanup levels, and GRO and DRO testing above the groundwater cleanup levels. MW-20 showed DRO above the groundwater cleanup levels, and MW-21 showed Benzene, GRO and DRO above the groundwater cleanup levels. The other two monitoring wells sampled did not detect any of the analytes above the groundwater or the alternate cleanup levels. Groundwater sampling will continue until such time that two consecutive monitoring events demonstrate that all monitor wells are below the applicable cleanup levels established for this site for all contaminants. Alyce Hughey
6/27/2011 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 71434 ASTs & truck loading rack. Paul Horwath
7/5/2011 Final Cleanup Report Reviewed ADEC completed a review of the Connestoga-Rovers Associates, Inc. request for site closure report. Paul Horwath
7/26/2011 Long Term Monitoring Complete Long term monitoring is considered complete, with ADEC issuance of a Cleanup Complete Decision letter. Paul Horwath
7/26/2011 Cleanup Complete Determination Issued ADEC issued a Cleanup Complete Decision letter, with two stiplulated conditions. A site drawing identifying areas of residual soil contamination was attached to the Decision letter. An Amendment to the Notice of Environmental Contamination was recorded with the Kenai District Recorder's Office. Paul Horwath
7/26/2011 Institutional Control Record Removed Institutional Controls have been removed. Paul Horwath
11/15/2011 Document, Report, or Work plan Review - other Reviewed the Groundwater Monitoring Well Decommissioning Former Unocal Bulk Plant 0745, dated October 5, 2011, from Conestoga-Rovers & Associates for Paul Horwath. Monitoring Wells MW-11, MW-19, MW-20, MW-21, MW-22 were decommissioned on September 16, 2011. The bottom cap was removed and then hydrated bentonite chips was placed to within 1 foot below grade. The well casing was then removed and the remaining top well space was filled with asphalt, concrete or gravel to match the existing grade. Alyce Hughey

Contaminant Information

Name Level Description Media Comments
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
Benzene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
Benzene > Table C Groundwater

Control Type

Type Details
No ICs Required

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.

No associated sites were found.

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