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Site Report: Chevron - #5799

Site Name: Chevron - #5799
Address: 2500 New Seward Hwy., Anchorage, AK 99503
File Number: 2100.26.003
Hazard ID: 23820
Status: Active
Staff: Rebekah Reams, 9074512144 rebekah.reams@alaska.gov
Latitude: 61.197668
Longitude: -149.868651
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

Gasoline, diesel, and used oil soil contamination encountered during June 1989 underground storage tank (UST) removal. Monitoring wells installed in November 1989 found groundwater contamination. Some additional monitoring wells were installed in 1990, 1991, and 1999 to help define the extent of the groundwater contamination. Groundwater is about 13 feet below the ground surface and flows off property towards the northwest. An active shop floor drain crib was found with contamination and oily product in 1992 and it was further assessed in 1994. A soil vapor extraction system was installed in 1992 and operated until 1996. Service station building and the existing tanks were removed in 1998. A new station building was built on the west side of the property and new tanks and piping were installed later that year. DRO/RRO/PCB contamination was found during tank upgrade in 2005 at a second former underground injection log crib for the floor drains. Chevron continues to monitor the groundwater at this active gasoline station site.

Action Information

Action Date Action Description DEC Staff
6/6/1989 Underground Storage Tank Site Characterization or Assessment While Chevron contractor was removing old USTs and installing new USTs contaminated soils were found. Former Staff
6/12/1989 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77982 Used oil and gasoline contaminant. Former Staff
6/12/1989 Site Added to Database Former Staff
6/13/1989 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU Date changed DB conversion Former Staff
6/22/1989 Leaking Underground Storage Tank Corrective Action Underway 2,015 tons of contaminated soil (stockpile #1 & #3) was thermally treated at AS&G. Former Staff
7/19/1989 Offsite Soil or Groundwater Disposal Approved Stockpile #2 from the waste oil UST excavation was thermally treated at APC. Former Staff
8/12/1989 Update or Other Action ADEC letter requests release investigation and cleanup of soil and groundwater contamination. Chevron reply with letter of intent on 9/1/89. Former Staff
10/14/1989 Document, Report, or Work plan Review - other Reviewed a phase 1 site assessment report. Former Staff
11/28/1989 Release Investigation Hart Crowser completes a soil/groundwater assessment. Groundwater is about 14 feet below the surface and flows towards the northwest. No dissolved hydrocarbons were detected upgradient of the site's contaminated areas. Contaminated groundwater in the three monitoring wells downgradient. TPH contamination above site cleanup levels was found in 5 of the 12 soil borings completed. Former Staff
2/21/1990 Document, Report, or Work plan Review - other Hart Crowser completes water well survey. Three active drinking water wells were identified in the search. Former Staff
7/16/1990 Document, Report, or Work plan Review - other ADEC approves workplan submitted by Hart Crowser for additional monitoring wells installation. Field work in progress 9/13/90. Former Staff
8/20/1990 Document, Report, or Work plan Review - other ADEC Letter to Chevron: Approving workplan for additional monitoring wells to be installed and monitored. Former Staff
8/20/1990 Update or Other Action ADEC Letter to Chevron: Based on evidence of both soil and groundwater contamination levels exceeding those accepted by ADEC, Chevron needs to submit a remediation workplan to ADEC. Former Staff
1/30/1991 Document, Report, or Work plan Review - other Reviewed a phase 2 site assessment report. Former Staff
7/15/1994 Document, Report, or Work plan Review - other Reviewed groundwater monitoring and soil vapor extraction system report. Former Staff
11/20/1997 Update or Other Action ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: CHEVRON PRODUCTS COMPANY, INC/PERMITS DESK Former Staff
1/30/2001 Meeting or Teleconference Held Annual meeting with ADEC & Chevron to review Alaska sites and set goals for 2001. See meeting notes for additional details. Linda Nuechterlein
4/2/2001 Update or Other Action Chevron still needs to submit Tank Removal Report so that contamination left in place from crib removal can be evaluated. Linda Nuechterlein
9/16/2003 Update or Other Action Approved reduction in groundwater monitoring. Robert Weimer
8/6/2004 Document, Report, or Work plan Review - other June 2, 2004 groundwater monitoring event. Up to 20 ug/l benzene in groundwater. Contamination levels appear to be increasing slightly. Robert Weimer
12/9/2004 Document, Report, or Work plan Review - other September 20, 2004 groundwater monitoring event. Up to 42 ug/l benzene in groundwater. Contamination levels appear to be increasing slightly. Robert Weimer
4/26/2005 Update or Other Action Reviewed and approved request to abandon monitoring well MW-13 to make way for the installation of an additional UST. Robert Weimer
5/5/2005 Meeting or Teleconference Held Call from consultant, they found another log crib during the installation of a new tank. Robert Weimer
5/5/2005 Site Visit Site visit: Area where crib was found was near where the 1992 crib was found. Contaminated soil found but not liquids. Also found a buried drum (8 feet below ground surface) about 20 feet south of the crib. Robert Weimer
5/6/2005 Update or Other Action ADEC informed EPA Region 10 UIC program about the log crib that was found at the site. Robert Weimer
5/11/2005 Update or Other Action ADEC approval of plan to transport contaminated soil to DeBarr site for temporary storage. Robert Weimer
6/2/2005 Offsite Soil or Groundwater Disposal Approved ADEC approves plan to thermally treat 600 yards of contaminated soils at ASR. This soil is currently stored at the Pinnacle Construction yard. Another 600 yards of contaminated soil is currently stored at the DeBarr site. Robert Weimer
6/22/2005 Document, Report, or Work plan Review - other Reviewed and discussed request to transport and treat PCB contaminated soil to OIT, but they are not currently approved. Soil will continue to be stored at the DeBarr site. Robert Weimer
7/12/2005 Document, Report, or Work plan Review - other May 12, 2005 groundwater monitoring event. Up to 740 ug/l benzene in groundwater. Contamination concentrations appear to be increasing. Groundwater flow is to the northwest. Robert Weimer
8/4/2005 Meeting or Teleconference Held Meeting with Chevron to discuss future site work. They are to sample the two highest contaminated wells for EDB and 1,2-DCA. They will submit a request to dispose of PCB contaminated soils in an out of state landfill. They will also submit a plan for installing additional monitoring wells and soil samples. Excavation sampling report to be submitted soon. Robert Weimer
8/9/2005 Offsite Soil or Groundwater Disposal Approved Approved disposal of 600 cubic yards of low level PCB contaminated soil at a landfill in Oregon. Chevron is to provide documentation when disposal is complete. Robert Weimer
11/30/2005 Document, Report, or Work plan Review - other September 30, 2005 groundwater monitoring event. Up to 800 ug/l benzene in groundwater. Contamination concentrations appear to be generally stable this monitoring event. Groundwater flow is to the north by northwest. Depth to groundwater is 9 to 13 feet below ground surface. Robert Weimer
12/1/2005 Document, Report, or Work plan Review - other Release investigation report for the new diesel tank excavation contamination (4 log cribs and solvent drums) encountered on May 5, 2005. 1,200 cubic yards of contaminated soil was excavated (600 cubic yards was thermally treated at ASR, and the other 600 cubic yards was disposed of at a permitted landfill in Oregon because of PCB contamination). Up to 2,800 mg/kg DRO, 68.3 mg/kg GRO, 1,720 mg/kg RRO, non-detect benzene, and 0.11 mg/kg PCBs remain in the base of the former excavation area at 12.5 feet below ground surface (at the groundwater interface). Robert Weimer
2/9/2006 Meeting or Teleconference Held Meeting with Chevron to discuss future site work. They are to sample the two highest contaminated wells for EDB and 1,2-DCA in 2006.They are to begin sampling monitoring well OS-1. May need water sampling near the contaminated area before site closure. Robert Weimer
11/1/2006 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of contaminated purge water. Robert Weimer
11/28/2006 Document, Report, or Work plan Review - other May 15, 2006 groundwater monitoring event. Up to 190 ug/l benzene in groundwater. Contamination concentrations appear to be generally stable. Groundwater flow is to the north by northwest. Depth to groundwater is 9 to 14 feet below ground surface. Robert Weimer
2/27/2007 Document, Report, or Work plan Review - other September 23, 2006 groundwater monitoring event. Up to 250 ug/l benzene in groundwater. Contamination levels appear to be increasing. Groundwater flow is to the north by northwest. Depth to groundwater is 13 feet below ground surface in the monitoring wells sampled. Robert Weimer
4/2/2007 Meeting or Teleconference Held Meeting with RP to discuss site. Approved abandoning monitoring wells OS-1 and OS-3. They will evaluate if surface infiltration is occurring in OS-1. They are to conduct BTEX, DRO, and HVOC groundwater analysis. Will need a monitoring well close to the remaining source area in the future. Robert Weimer
8/1/2007 Document, Report, or Work plan Review - other ADEC approves workplan to decommission off property well OS-1. Robert Weimer
11/6/2007 Document, Report, or Work plan Review - other Reviewed sensitive receptor and well survey report. 37 past water wells were identified within 1/4 mile of the site, 4 that are currently in use. The in use wells all appear to be upgradient or cross gradient from the site. All parcels in the area are commercial slab on grade without basements. Chester Creek is located about 1/4 mile to the north of the site. Robert Weimer
2/20/2008 Document, Report, or Work plan Review - other May 16, 2007 groundwater monitoring event. Up to 130 ug/l benzene, non-detect (<0.0098 ug/l) 1,2 EDB, and 0.5 ug/l 1,2 DCA in groundwater. Contamination concentrations appear to be decreasing. Groundwater flow is to the north by northwest. Depth to groundwater was 9.27 to 13.8 feet below ground surface in the monitoring wells sampled. Robert Weimer
2/20/2008 Document, Report, or Work plan Review - other Review of conceptual site model. Completed pathways include ingestion and dermal contact of soil, ingestion of groundwater, and inhalation of outdoor/indoor air. Robert Weimer
2/21/2008 Document, Report, or Work plan Review - other August 15, 2007 groundwater monitoring event. Up to 120 ug/l benzene and 1.2 mg/l DRO in groundwater. Contamination concentrations appear to be stable. Groundwater flow is historically to the north by northwest. Depth to groundwater was 9.62 to 13.71 feet below ground surface in the monitoring wells sampled. Monitoring well OS-1 was abandoned on 8/14/07. Robert Weimer
3/5/2008 Meeting or Teleconference Held Meeting with Chevron and their consultants. Chevron to conduct and indoor air evaluation for this site. They are to continue semi-annual monitoring. They will submit a plan for additional assessment and monitoring well(s) at the site. Robert Weimer
4/18/2008 Exposure Tracking Model Ranking Site ranked on the new Exposure Tracking Model (ETM). The ETM is a new site ranking system that looks at, based on available data, the potential exposure pathways for the contamination remaining at the site. Robert Weimer
4/21/2008 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of 15 gallons of contaminated purge water. Robert Weimer
6/18/2008 Site Visit At the request of the project manager the quality assurance officer conducted a field oversight visit to document samping activities on June 3, 2008 soil borings; June 4, 2008 monitoring well installation; June 18, 2008 monitoring well sampling; and July 18, 2008 offsite monitoring well sampling. No deviations from the work plan were noted and all sampling activites were completed using standard practices and techniques. Brenton Porter
7/8/2008 Offsite Soil or Groundwater Disposal Approved ADEC approves thermal treatment of 14 drums of contaminated soil. Robert Weimer
7/9/2008 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of 2 drums of contaminated purge water. Robert Weimer
9/25/2008 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of contaminated purge water. Robert Weimer
12/16/2008 Document, Report, or Work plan Review - other June 18, 2008 groundwater monitoring event. Up to 160 ug/l benzene, 32 mg/l GRO, and 4.4 mg/l DRO in groundwater. Contamination concentrations appear to be increasing. Groundwater flow was to the northwest. Depth to groundwater was 9.11 to 13.20 feet below ground surface in the monitoring wells sampled. Monitoring well OS-1 was abandoned on 8/14/07. Robert Weimer
1/21/2009 Document, Report, or Work plan Review - other Reviewed subsurface investigation and well installation report. Between May 31 and June 4, 2008 5 soil borings and 3 replacement monitoring wells (MW-1R, MW-2R, and MW-11R) were installed. Up to 0.09 mg/kg benzene, 160 mg/kg GRO, 2,300 mg/kg DRO, and 2,900 mg/kg RRO in the soil areas sampled. Groundwater was at 12.71 to 12.82 feet below ground surface in the 3 replacement monitoring wells. Robert Weimer
2/25/2009 Meeting or Teleconference Held Meeting with Chevron and their consultants. Chevron to conduct and indoor air evaluation for this site. Chevron to do additional assessment to evaluate newly discovered anomalies. Robert Weimer
4/10/2009 Document, Report, or Work plan Review - other August 27, 2008 groundwater monitoring event. Up to 230 ug/l benzene, 2.8 mg/l GRO, and 25 mg/l DRO in groundwater. Contamination concentrations increased in 1 of the 5 monitoring wells sampled. Groundwater flow was to the northwest. Depth to groundwater was 9.32 to 13.44 feet below ground surface in the monitoring wells sampled. Robert Weimer
4/28/2009 Update or Other Action ADEC approves request to suspend sampling for HVOCs in monitoring wells OS-2, OS-3, MW-1R, MW-2R, and MW-11R. Robert Weimer
6/17/2009 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of one drum of contaminated purge water. Robert Weimer
10/13/2009 Document, Report, or Work plan Review - other May 12, 2009 groundwater monitoring event. Up to 210 ug/l benzene, 1.6 mg/l GRO, and 5.3 mg/l DRO in groundwater. Contamination concentrations increased in 1 of the 5 monitoring wells sampled. Groundwater flow was to the northwest. Depth to groundwater was 9.15 to 13.42 feet below ground surface in the monitoring wells sampled. Robert Weimer
1/11/2010 Document, Report, or Work plan Review - other August 27, 2009 groundwater monitoring event. Up to 280 ug/l benzene, 2.1 mg/l GRO, and 6.7 mg/l DRO in groundwater. Contamination levels increased in 4 of the 5 monitoring wells sampled. Groundwater flow was to the northwest. Depth to groundwater was 9.58 to 13.75 feet below ground surface in the monitoring wells sampled. Robert Weimer
3/11/2010 Meeting or Teleconference Held Meeting with Chevron and their consultants on 3/10/10. MW2R & MW11R are to be sampled for PAH the next monitoring event. Chevron will submit a workplan for additional assessment of newly-discovered anomalies and north of the current dispenser islands based on the 2009 ground penetrating radar results. We discussed that groundwater samples for volatiles should not be collected with bailers or peristaltic pumps due to the loss of volatiles, Chevron is to provide a workplan specifying how groundwater samples will be collected in the future. Robert Weimer
5/20/2010 Update or Other Action Approved, until further notice, no-purge groundwater sampling at this site. Robert Weimer
6/16/2010 Site Visit Site visit to observe collection of groundwater samples. CRA field samplers included Siobahn Fackelman and Dianne Escobedo. Brent Porter represented the ADEC. Brenton Porter
8/6/2010 Document, Report, or Work plan Review - other Conditionally approved the August 5, 2010 Site Assessment Work Plan. The work plan proposes to drill 4 soil borings that may be completed as monitoring wells. The work plan was approved under the following conditions: 1. The west and northwest boring locations be completed as monitoring wells regardless of field readings. 2. At a minimum the east boring will need to be hand augured from 3 to 5 feet so a confirmation sample can be collected at 5 feet below ground surface. Robert Weimer
8/9/2010 Site Visit Site visit to observe confirmation soil sampling and installation of monitoring well. Robert Weimer
8/27/2010 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of contaminated purge water. Robert Weimer
10/6/2010 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of contaminated purge water. Robert Weimer
11/3/2010 Offsite Soil or Groundwater Disposal Approved DEC approves transport and disposal at a permitted landfill in Oregon of the 1 drum and 3 super sacks of contaminated soil generated during site characterization work in August 2010. The soils contained some PCBs. Robert Weimer
2/17/2011 Document, Report, or Work plan Review - other June 14, 2010 groundwater monitoring event. Up to 200 ug/l benzene, 1.2 mg/l GRO, and 4.2 mg/l DRO in groundwater. Contamination concentrations decreased in 3 of the 3 monitoring wells sampled. The two off property monitoring wells could not be sampled due to lack of site access. Groundwater flow was to the northwest. Depth to groundwater was 13.44 to 13.62 feet below ground surface in the monitoring wells sampled. Robert Weimer
4/5/2011 Document, Report, or Work plan Review - other September 5, 2010 groundwater monitoring event. Up to 210 ug/l benzene, 1.1 mg/l GRO, and 2.5 mg/l DRO in groundwater. Contamination concentrations decreased in 3 of the 5 monitoring wells sampled. The two off property monitoring wells could not be sampled due to lack of site access. Groundwater flow was to the northwest. Depth to groundwater was 13.41 to 14.58 feet below ground surface in the monitoring wells sampled. Robert Weimer
10/13/2011 Document, Report, or Work plan Review - other Review subsurface investigation and well installation report. On August 9-10, 2010 four soil borings were sampled and two were completed as monitoring wells. Up to 24 mg/kg DRO, 7.5 mg/kg GRO, and 0.11 mg/kg benzene in the soi samples collected. No PCBs, RRO, HVOCs, 1,2-DCA, EDB or PAH were detected above cleanup levels. Robert Weimer
10/26/2011 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of contaminated purge water. Robert Weimer
3/7/2012 Meeting or Teleconference Held Meeting with Chevron and their consultants on 2/28/12. Chevron is having trouble obtaining access to offsite monitoring wells OS2 & OS3, they will provide contact information to ADEC. They are to continue semi-annual groundwater monitoring. Robert Weimer
8/21/2012 Offsite Soil or Groundwater Disposal Approved ADEC approves offsite treatment of contaminated purge water. Robert Weimer
12/19/2012 Document, Report, or Work plan Review - other May 23, 2012 groundwater monitoring event. Up to 40 ug/l benzene, 0.63 mg/l GRO, and 5.0 mg/l DRO in groundwater. Contamination concentrations increased in 3 of the 5 monitoring wells sampled. The two off property monitoring wells could not be sampled due to lack of site access. Groundwater flow was to the northwest. Depth to groundwater was 12.99 to 14.22 feet below ground surface in the monitoring wells sampled. Results are biased low because samples were not preserved in the field. Robert Weimer
1/29/2013 Document, Report, or Work plan Review - other August 1, 2012 groundwater monitoring event. Up to 150 ug/l benzene, 0.37 mg/l GRO, and 14.0 mg/l DRO in groundwater. Contamination levels increased in 5 of the 7 monitoring wells sampled. Groundwater flow was to the northwest. Depth to groundwater was 9.63 to 14.22 feet below ground surface in the monitoring wells sampled. Robert Weimer
2/27/2013 Meeting or Teleconference Held Meeting with Chevron and their consultants on 2/26/13. Chevron proposes to continue to conduct semi-annual groundwater monitoring to monitor for natural attenuation and trends. The next groundwater sampling event they will sample both using no purge and purge help evaluate that the past no purge results were providing comparable data. We discussed that all semi-annual monitoring events need to be at least 120 days apart. Robert Weimer
3/26/2013 Document, Report, or Work plan Review - other DEC conditionally approves the use of a portable activated carbon (gac) filter system for this site to treat water generated during groundwater monitoring. The storage of water at the site or the secure storage area at 1441 C Street is also approved. Robert Weimer
5/21/2013 Meeting or Teleconference Held Consultant called to notify ADEC that the recent ground water samples were over temperature and outside holding times. They will have the samples analyzed and note in the report that those samples mat be biased low. ADEC will review the results of the split samples to determine if another split sample event will be needed. Robert Weimer
1/28/2014 Document, Report, or Work plan Review - other May 22, 2013 groundwater monitoring event. Up to 600 ug/l benzene, 0.55 mg/l GRO, and 4.3 mg/l DRO in groundwater. Because samples were over temperature and outside holding times, they should be considered biased low. Contamination concentrations increased in 5 of the 7 monitoring wells sampled. Groundwater flow was to the northwest. Depth to groundwater was 8.23 to 13.11 feet below ground surface in the monitoring wells sampled. The groundwater was sampled both using no-purge with hydrasleeves, and purge using a bladder pump. The sampling interval for the bladder pump was not documented in the field notes. The hydrasleeve sampling was from the top of the water column. Robert Weimer
2/14/2014 Document, Report, or Work plan Review - other September 17-18, 2013 groundwater monitoring event. Up to 23 ug/l benzene, 0.33 mg/l GRO, and 5.8 mg/l DRO in groundwater. One of the off property monitoring wells (OS-2) had contamination (1.6 mg/l DRO and 8.6 ug/l benzene) over cleanup levels. Contamination concentrations increased in 3 of the 7 monitoring wells sampled. Groundwater flow was to the northwest. Depth to groundwater was 8.04 to 12.70 feet below ground surface in the monitoring wells sampled. The groundwater was sampled using no-purge with hydrasleeves, and the sampling interval was the top of the water column. Robert Weimer
2/27/2014 Meeting or Teleconference Held Meeting with Chevron and their consultants on 2/27/2014. They plan to continue semi-annual groundwater monitoring. Because of problems with last year’s purge/no-purge sampling the next groundwater sampling event they will sample both using no purge and purge help evaluate that the past no purge results were providing comparable data or they will switch to no purge for future sampling events. We discussed that the groundwater samples needs to be collected as close as possible to the soil/water interface, with the pump intake within a foot of the soil/water interface at the time of the sampling. In the future they will need to evaluate for a diving plume on the monitoring wells far from the release point. The consultant will make sure that their site reports are complete in accordance with DEC’s 9/23/2009 Site Characterization Work Plan and Reporting Guidance for Investigation of Contaminated Sites. Robert Weimer
9/22/2014 Conceptual Site Model Submitted Conceptual site model identified potential pathways for soil ingestion, groundwater ingestion, inhalation of outdoor air, and inhalation of indoor air. Robert Weimer
4/6/2015 Document, Report, or Work plan Review - other May 6, 2014 groundwater monitoring event. Up to 18 ug/l benzene, 0.34 mg/l GRO, and 2.7 mg/l DRO in groundwater. One of the off property monitoring wells (OS-2) had contamination (18 ug/l benzene) over cleanup levels. Contamination concentrations increased in 5 of the 6 monitoring wells sampled. Groundwater flow was to the northwest. Depth to groundwater was 12.02 to 13.02 feet below ground surface in the monitoring wells sampled. The groundwater was sampled using bladder pump after purging, but the results are considered biased low because the pump intake was not at the top of the water column as required, it was at 1.93 to 2.0 feet below the soil/water interface. Robert Weimer
5/14/2015 Document, Report, or Work plan Review - other November 5, 2014 groundwater monitoring event. Up to 9.3 ug/l benzene, 0.55 mg/l GRO, and 1.2 mg/l DRO in groundwater. One of the off property monitoring wells (OS-2) that had contamination (18 ug/l benzene) over cleanup levels last monitoring event was not located this event. Contamination concentrations increased in 4 of the 6 monitoring wells sampled. Groundwater flow was to the northwest. Depth to groundwater was 10.40 to 13.62 feet below ground surface in the monitoring wells sampled. The groundwater was sampled using bladder pump after purging, and was sampled at the top of the water column as required. Robert Weimer
1/25/2016 Update or Other Action DEC approves extension request to submit the 2nd semi-annual 2015 groundwater monitoring report by February 29, 2016. Robert Weimer
4/22/2016 Document, Report, or Work plan Review - other May 1, 2015 groundwater monitoring event. Up to 6.6 ug/l benzene, 0.52 mg/l GRO, and non-detect (<0.71 mg/l) DRO in groundwater. One of the off property monitoring wells (OS-2) that had contamination (18 ug/l benzene) over cleanup levels last monitoring event was not sampled this event because it was redeveloped and repaired. Contamination concentrations increased in 1 of the 6 monitoring wells sampled. Groundwater flow was to the northwest. Depth to groundwater was 10.88 to 14.25 feet below ground surface in the monitoring wells sampled. The groundwater was sampled using bladder pump after purging, and was sampled at the top of the water column as required. Robert Weimer
11/16/2016 Document, Report, or Work plan Review - other November 20, 2015 groundwater monitoring event. Up to 43.0 ug/l benzene, 39 mg/l GRO, and 2.5 mg/l DRO in groundwater. Contamination concentrations increased in 4 of the 6 monitoring wells sampled. Monitoring well MW-14 was frozen and not sampled this event. Groundwater flow was to the northwest. Depth to groundwater was 10.21 to 13.50 feet below ground surface in the monitoring wells sampled. The groundwater was sampled using bladder pump after purging, and was sampled at the top of the water column as required. Robert Weimer
1/11/2017 Document, Report, or Work plan Review - other May 18, 2016 groundwater monitoring event. Up to 10.0 ug/l benzene, 1.1 mg/l GRO, and 1.6 mg/l DRO in groundwater. Contamination concentrations increased in 2 of the 7 monitoring wells sampled. Groundwater flow was to the northwest. Depth to groundwater was 10.63 to 14.13 feet below ground surface in the monitoring wells sampled. The groundwater was sampled using bladder pump after purging, and was sampled at the top of the water column as required. Robert Weimer
11/17/2017 Document, Report, or Work plan Review - other May 25, 2017 groundwater monitoring event. Up to 25.0 ug/l benzene, 0.53 mg/l GRO, and 1.4 mg/l DRO in groundwater. Contamination concentrations increased in 4 of the 7 monitoring wells sampled. Groundwater flow was to the northwest. Depth to groundwater was 11.06 to 14.73 feet below ground surface in the monitoring wells sampled. The groundwater was sampled using bladder pump after purging, and was sampled at the top of the water column as required. Robert Weimer
1/19/2018 Document, Report, or Work plan Review - other September 29, 2017 groundwater monitoring event. Up to 21.0 ug/l benzene, 0.45 mg/l GRO, and 1.1 mg/l DRO in groundwater. Contamination concentrations increased in 3 of the 8 monitoring wells sampled. Groundwater flow was to the northwest. Depth to groundwater was 10.63 to 14.60 feet below ground surface in the monitoring wells sampled. The groundwater was sampled using bladder pump after purging, and was sampled at the top of the water column as required. Robert Weimer
1/19/2018 Update or Other Action DEC approves suspending all groundwater monitoring for monitoring well MW-14, GRO in all wells, and DRO in OS-2. DEC does request that all of the monitoring wells sampled during the next monitoring event to be also sampled for full VOCs (method 8260) and PAHs (method 8270). Robert Weimer
1/14/2019 Document, Report, or Work plan Review - other June 6-7, 2018 groundwater monitoring event. Up to 17.0 ug/l benzene and 1.9 mg/l DRO in groundwater. Other VOCs were non detect or below cleanup levels. MTBE was non-detect and PAH samples were below cleanup levels except for naphthalene which was 2 ug/l (1.7 ug/l cleanup level). Contamination concentrations increased in 3 of the 6 monitoring wells sampled. Groundwater flow was to the northwest. Depth to groundwater was 10.68 to 14.17 feet below ground surface in the monitoring wells sampled. The groundwater was sampled using bladder pump after purging, and was sampled at the top of the water column as required. Method 8260 naphthalene results were not provided. Robert Weimer
1/15/2019 Update or Other Action ADEC requested submittal of method 8260 naphthalene results that were not provided for the June 6-7, 2018 groundwater sampling event. Robert Weimer
1/17/2019 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77982 2005 old log crib contamination. Robert Weimer
6/12/2019 Document, Report, or Work plan Review - other October 16, 2018 groundwater monitoring event. Up to 14.0 ug/l benzene and 2.8 mg/l DRO in groundwater. Other VOCs were non detect or below cleanup levels. Contamination concentrations increased in 3 of the 6 monitoring wells sampled. Groundwater flow was to the northwest. Depth to groundwater was 10.69 to 14.18 feet below ground surface in the monitoring wells sampled. The groundwater was sampled using bladder pump after purging, and was sampled at the top of the water column as required. Full method 8260 results were not provided. Robert Weimer
7/16/2019 Update or Other Action ADEC again requested submittal of method 8260 naphthalene results that were not provided for the June 6-7, 2018 groundwater sampling event and all subsequent events. Robert Weimer
9/23/2019 Update or Other Action ADEC requests for this site that the monitoring wells are purged prior to sampling, and that the intake of the bladder pump/in-well pump be documented in the field notes to be within the top foot of the water column at the time of the sampling. Also VOC sampling needs to include the full 8260 VOC list including naphthalene. Robert Weimer
1/7/2020 Document, Report, or Work plan Review - other April 11, 2019 groundwater monitoring event. Up to 10.0 ug/l benzene and 2.2 mg/l DRO in groundwater. Other VOCs were non detect or below cleanup levels. Contamination concentrations increased in 0 of the 6 monitoring wells sampled. Groundwater flow was to the northwest. Depth to groundwater was 10.69 to 14.18 feet below ground surface in the monitoring wells sampled. The groundwater was sampled using bladder pump after purging. Because the pump intake was not sampled within the top foot of the water column as required the results may be biased low. Full method 8260 results were not provided. Robert Weimer
3/12/2020 Update or Other Action ADEC requests for this site that the monitoring wells are purged prior to sampling, and that the intake of the bladder pump/in-well pump be documented in the field notes to be within the top foot of the water column at the time of the sampling. Also all BTEX and VOC sampling needs to include the full 8260 VOC list including naphthalene. ADEC is also requesting that all reports be submitted within 60 days of the sampling and the groundwater monitoring figure include a diagram showing historic groundwater flow directions. Robert Weimer
3/17/2020 Document, Report, or Work plan Review - other DEC reviewed 2020 groundwater sampling plan and provided the following comments: For all future monitoring events please make sure that the field notes document the measurement of the pump intake that is within the top foot of the water column at the time of the sampling unless the top of the well screened interval is deeper, then in that case from the top foot of that screened interval. For all future monitoring events any monitoring well where BTEX or HVOC sampling is proposed it needs to be the full VOC (method 8260) list, including naphthalene. The field QC samples are per day of sampling at a site. For all future monitoring events all reports be submitted within 60 days of the sampling and the groundwater monitoring figure include a diagram showing historic groundwater flow directions. For all future monitoring events if a monitoring well is low yield and purges dry then a sample will still need to be collected that monitoring event once the monitoring well has recharged to approximately 80% of its pre-purge volume. If it has not returned to 80% of its pre-purged volume during that sampling day DEC requests that you return to the site early the next day to attempt to collect the water sample. Robert Weimer
5/26/2020 Document, Report, or Work plan Review - other 2019 Second Semi-Annual Groundwater Monitoring event was conducted on September 12, 2019. Groundwater samples were collected from monitoring wells MW-1R, MW-2R, MW-11R, MW-15, OS-2 and OS-3. Samples were submitted to the laboratory for BTEX and DRO analysis. Groundwater flow direction was to the northwest and depth to groundwater was 10.49 to 13.96 feet below ground surface. Rebekah Reams
5/26/2020 Document, Report, or Work plan Review - other 2020 First Semi-Annual Groundwater Monitoring event was conducted on April 6, 2020. Groundwater samples were collected from monitoring wells MW-1R, MW-2R, MW-11R, MW-15 and OS-2. Well OS-3 was obstructed by ice at 5.7 ft and was not able to be sampled. Samples were submitted to the laboratory for VOCs and DRO analysis. Groundwater flow direction was to the north-northwest and depth to groundwater was 12.5 to 12.49 feet below ground surface. Rebekah Reams
11/25/2020 Long Term Monitoring Workplan or Report Review 2020 Second Semi-Annual Groundwater Monitoring event was conducted on October 1, 2020. Groundwater samples were collected from monitoring wells MW-1R, MW-2R, MW-11R, MW-15, OS-2 and OS-3. Samples were submitted to the laboratory for VOCs and DRO analysis. Groundwater flow direction was to the northwest and depth to groundwater was 10.69 to 14.32 feet below ground surface. Benzene, EDB, and 1,2,3-trichloropropane exceeded cleanup levels during this sampling event. Rebekah Reams
1/15/2021 Meeting or Teleconference Held DEC staff met with Chevron Environmental Management Company (CEMC) and Arcadis to discuss Chevron sites located in Alaska during the Annual Portfolio Meeting on January 14th and 15th, 2021. Rebekah Reams
1/10/2022 Long Term Monitoring Workplan or Report Review 2021 Second Semi-Annual Groundwater Monitoring event was conducted on August 30, 2021. Groundwater samples were collected from monitoring wells MW-1R, MW-2R, MW-11R, MW-15, OS-2 and OS-3. Samples were submitted to the laboratory for VOCs and DRO analysis. Groundwater flow direction was to the west-northwest and depth to groundwater was 10.35 to 14.82 feet below ground surface. Benzene exceeded cleanup levels at monitoring well OS-2 during this sampling event. Rebekah Reams
6/24/2022 Long Term Monitoring Workplan or Report Review 2022 First Semi-Annual Groundwater Monitoring event was conducted on April 6, 2022. Groundwater samples were collected from monitoring wells MW-1R, MW-2R, MW-11R, MW-15, OS-2. Monitoring well OS-3 could not be gauged or sampled due to ice within well casing. Samples were submitted to the laboratory for VOCs and DRO analysis. Groundwater flow direction was to the northwest and depth to groundwater was 13.34 to 14.51 feet below ground surface. Rebekah Reams
9/29/2022 Document, Report, or Work plan Review - other ADEC provided comments on the Treatment of Purge Water Utilizing Granular Activated Carbon (GAC) at Chevron Environmental Management Company Sites which includes standard operating procedures and breakthrough estimates proposed for use at this site. Rebekah Reams
12/23/2022 Offsite Soil or Groundwater Disposal Approved DEC approved transport of one 55-gallon drum of purge water for offsite disposal Rebekah Reams
3/21/2023 Long Term Monitoring Workplan or Report Review DEC provided comments on the Groundwater Sampling Analyte Reduction Request – Groundwater Sampling Work Plan Addendum. This work plan addendum proposes to update the groundwater monitoring schedule to include analysis for DRO and benzene at MW-1R, MW-2R, MW-11R, MW-14, MW-15, OS-2, and OS-3 on a semi-annual basis. Rebekah Reams
6/18/2023 Long Term Monitoring Workplan or Report Review 2021 First Semi-Annual Groundwater Monitoring event was conducted on April 16, 2021. Groundwater samples were collected from monitoring wells MW-1R, MW-2R, MW-11R, MW-15, and OS-2. Monitoring well casing for OS-3 was frozen at 3 feet below the top of casing. Samples were submitted to the laboratory for VOCs and DRO analysis. Groundwater flow direction was to the north-northwest and depth to groundwater was 13.81 to 14.92 feet below ground surface. Benzene and 1,2,3-trichloropropane exceeded cleanup levels during this sampling event. Rebekah Reams
10/12/2023 Document, Report, or Work plan Review - other ADEC approved the Revised Conceptual Site Model and Soil Investigation Work Plan following comment resolution. This work plan proposes to advance eight soil borings to evaluate current site conditions, define the extent of contamination in soil, and further evaluate the presence of metals at this site. Rebekah Reams
11/20/2023 Offsite Soil or Groundwater Disposal Approved ADEC approved offsite transport of two 55-gallon drums of soil cuttings and one 55-gallon drum of purge water. Rebekah Reams

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State of Alaska Department of Environmental Conservation

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Juneau, AK 99811-1800
Phone: 907-465-5066
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Physical Location: 410 Willoughby