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Site Report: Unocal - #5580 (former), Cline's Tesoro

Site Name: Unocal - #5580 (former), Cline's Tesoro
Address: 442 Gambell Street, Anchorage, AK 99501
File Number: 2100.26.112
Hazard ID: 23368
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 61.217788
Longitude: -149.871383
Horizontal Datum:

We make every effort to ensure the data presented here is accurate based on the best available information currently on file with DEC. It is therefore subject to change as new information becomes available. We recommend contacting the assigned project staff prior to making decisions based on this information.

Problems/Comments

Site facilities were constructed on this property in 1966 and consisted of a three-bay station with two hoists on the west side of the property, three pump islands, two 8,000-gallon unleaded gasoline underground storage tanks (USTs), one 4,000-gallon diesel UST, and one 280-gallon waste oil tank. In 1987 three product tanks were replaced and hydrocarbon contamination was identified in soil and groundwater. Throughout the course of site characterization and cleanup activities, analytical samples have been collected from soil and groundwater and analyzed for diesel range organics (DRO), gasoline range organics (GRO), residual range organics (RRO) benzene, ethylbenzene, toluene, and xylenes (BTEX), polychlorinated biphenyls (PCBs), volatile organic compounds (VOCs), polycyclic aromatic hydrocarbons (PAHs), and metals. Based on these analyses DRO, GRO, BTEX, PCE, and naphthalene were detected above cleanup levels at the site. Site characterization and remediation activities have included the excavation and remediation of contaminated soils, the installation of nine monitoring wells (MW-1 through MW-9), and the advancement of soil borings throughout the site during several site characterization events. Analytical samples that represent current site conditions demonstrate that concentrations of all analytes in soil and groundwater are below the most stringent Alaska Department of Environmental Conservation (ADEC) cleanup levels established in 2018.

Action Information

Action Date Action Description DEC Staff
10/21/1986 Underground Storage Tank Site Characterization or Assessment RZA's subsurface petroleum hydrocarbon contamination evaluation. Groundwater was at about 36 feet and flowed towards the northwest. Groundwater sample MW-3, taken on 11/15/86, had 71 ug/l benzene. Former Staff
1/1/1987 Leaking Underground Storage Tank Emergency Response The diesel storage tank would not pass the hydrostatic test. Unocal elected to replace all the underground storage tanks. Unocal is in the process of selling the station. Former Staff
3/23/1987 Release Investigation ADEC directs Unocal to locate and sample nearest downgradient drinking water well. RZA consultants investigation indicated all private residences in study area were on city water, therefore, no sampling was done. Former Staff
6/23/1987 Leaking Underground Storage Tank Corrective Action Underway Establishing a monitoring program with quarterly sampling and water level monitoring. ADEC requests more monitoring wells on 7/8/87. Former Staff
12/9/1987 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 78054 ADD; Petroleum contaminant. Former Staff
12/9/1987 Site Added to Database Former Staff
12/10/1987 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU; :LCAU Date changed DB conversion Former Staff
10/24/1988 Document, Report, or Work plan Review - other Groundwater monitoring results. Sample MW-3 on 10/24/88 had 28 ug/l benzene. Former Staff
11/20/1997 Update or Other Action ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: CLINES TEXACO Former Staff
4/10/1998 Document, Report, or Work plan Review - other UST assessment report. Tanks were removed in April 8-10, 1998 and replaced with new tanks. Contaminated soil and groundwater remains at the site (Up to 2,300 mg/kg DRO and 7,700 mg/kg RRO at the used oil tank; up to 8.2 mg/kg benzene, 2,110 mg/kg GRO, and 8,500 mg/kg DRO at the gasoline tanks and piping). Robert Weimer
1/17/2001 Update or Other Action ADEC letter requesting a corrective action plan revision, and a replacement monitoring well. Daniel Rogers
3/14/2003 Update or Other Action ADEC approved plan to install replacement monitoring wells. Robert Weimer
8/12/2004 Meeting or Teleconference Held Meeting with Unocal. They will submit a workplan for the installation of one additional monitoring well and to repair or replace monitoring well MW-3. Robert Weimer
9/16/2004 Document, Report, or Work plan Review - other ADEC approves updated workplan to install an additional monitoring well and to collect soil and groundwater samples at the site. MW-4 is approved to be abandoned. Robert Weimer
5/12/2005 Document, Report, or Work plan Review - other On 12/2/05 an additional monitoring well was installed (MW-8), and one monitoring well was abandoned (MW-4). The soil samples collected from MW-8 met default cleanup levels. The groundwater was sampled on 3/8/05, and was found to flow to the north by northeast. The monitoring wells were non-detect for benzene and GRO, but 7.1 mg/l DRO was found in monitoring well MW-1. Robert Weimer
6/7/2005 Document, Report, or Work plan Review - other Received a revised monitoring well installation report. Robert Weimer
1/10/2006 Meeting or Teleconference Held Meeting with RP's consultant to discuss future site work. Discussed installing soil vapor extraction for the contaminated soil at the site. Groundwater monitoring to continue. Robert Weimer
3/28/2007 Document, Report, or Work plan Review - other September 19, 2006 groundwater monitoring event. Up to 0.51 mg/l DRO, non detect (<5 ug/l) benzene, and non detect (<0.01 mg/l) GRO in the groundwater. Four monitoring wells were sampled (MW-1, MW-2, MW-3, and MW-8). Contamination concentrations have decreased since the previous sampling on 3/9/05. The groundwater flow direction is to the north by northeast. Historical groundwater flow direction has been from the west by northwest to northeast. The depth to groundwater was 34.97 to 36.65 feet below ground surface. Robert Weimer
4/2/2007 Meeting or Teleconference Held Meeting with RP to discuss site. They will check with property owner about scheduling corrective action (i.e.. operating an active system or waiting until the tanks/piping are removed to access remaining contaminated soils). Robert Weimer
8/3/2007 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of contaminated purge water. Robert Weimer
1/8/2008 Document, Report, or Work plan Review - other June 28, 2007 groundwater monitoring event. Up to 0.56 mg/l DRO, non detect (<1 ug/l) benzene, and non detect (<0.01 mg/l) GRO in the groundwater. Four monitoring wells were sampled (MW-1, MW-2, MW-3, and MW-8). Contamination concentrations are stable. The groundwater flow direction is to the north by northeast. Historical groundwater flow direction has been from the west by northwest to northeast. The depth to groundwater was 35.33 to 37.02 feet below ground surface. 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. The will continue to do semi-annual groundwater monitoring. Prior to closure confirmation soil samples will need to be collected. Robert Weimer
4/21/2008 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of 50 gallons of contaminated purge water. Robert Weimer
5/28/2008 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
7/29/2008 Document, Report, or Work plan Review - other Conceptual site model submitted for this site. Potental pathways include incedential soil ingestion, ingestion of groundwater, inhalation of outdoor air, and inhalation of indoor air. Robert Weimer
9/25/2008 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of contaminated purge water. Robert Weimer
12/30/2008 Document, Report, or Work plan Review - other June 3, 2008 groundwater monitoring event. Up to 1.0 mg/l DRO, non detect (<1 ug/l) benzene, and non detect (<0.01 mg/l) GRO in the groundwater. Four monitoring wells were sampled (MW-1, MW-2, MW-3, and MW-8). Contamination concentrations increased in 2 of the 4 monitoring wells sampled. The groundwater flow direction is to the north by northeast. Historical groundwater flow direction has been from the west by northwest to northeast. The depth to groundwater was 35.34 to 37.04 feet below ground surface. Robert Weimer
2/25/2009 Meeting or Teleconference Held Meeting with Chevron and their consultants. They are to conduct an evaluation of indoor air at this site. Additional soil and groundwater characterization is needed. Site monitoring is to continue. Robert Weimer
3/16/2009 Document, Report, or Work plan Review - other August 12, 2008 groundwater monitoring event. Up to 0.1 mg/l DRO, non detect (<1 ug/l) benzene, and non detect (<0.01 mg/l) GRO in the groundwater. Four monitoring wells were sampled (MW-1, MW-2, MW-3, and MW-8). Contamination concentrations decreased in the 4 monitoring wells sampled. The groundwater flow direction is to the north by northeast. Historical groundwater flow direction was to northeast. The depth to groundwater was 31.83 to 37.82 feet below ground surface. Robert Weimer
6/4/2009 Meeting or Teleconference Held Discussed site the RPs consultant (CRA). They will be submitting a request for reduction in groundwater monitoring. We discussed that it would be ok to suspend sampling of monitoring wells MW-1 and MW-2, but should continue semi-annual groundwater monitoring of MW-3 and MW-8. ADEC requests a rose diagram of historical groundwater monitoring events on this and all other CRA sites. Robert Weimer
6/8/2009 Update or Other Action Review and approve request to suspend sampling of monitoring wells MW-1 and MW-2. Robert Weimer
11/5/2009 Document, Report, or Work plan Review - other June 18, 2009 groundwater monitoring event. Up to 0.27 mg/l DRO, non detect (<0.5 ug/l) benzene, and non detect (<0.01 mg/l) GRO in the groundwater. Two monitoring wells were sampled (MW-3 and MW-8). Contamination concentrations increased in the 1 of the monitoring wells sampled. The groundwater flow direction is to the north by northeast. Historical groundwater flow direction was to northeast. The depth to groundwater was 35.57 to 37.23 feet below ground surface. Robert Weimer
3/11/2010 Meeting or Teleconference Held Meeting with Chevron and their consultants on 3/10/10. Chevron will submit a workplan for confirmation soil samples and monitoring wells near former monitoring wells MW5 & MW6. 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
6/2/2010 Meeting or Teleconference Held Discussed confirmation sampling with Chevron's consultant. Need monitoring well just east of former MW-5, and at C-7. Need angle soil boring to get to C-20 location. Need soil borings at C-7, C-1, C-4, C-14, C-17, and C-45. Add EDB, 1,2-DCA, and PAH on at least 10% of the highest samples, including one for the used oil (C-20), tanks, and dispensers. Robert Weimer
6/16/2010 Meeting or Teleconference Held Discussed confirmation sampling with Chevron's consultant based on an updated site figure of past soil sampling at this site. Based on that information we have revised the confirmation soil sampling and monitoring well locations. Need monitoring wells at C-1, at C-7 if soil contamination extends to groundwater at that location, and at C-4 if it extends to groundwater at that location but does not at C-7. Need soil borings at C-1, C-4, C-7, C-45, C-46, and C-48. Add EDB, 1,2-DCA, and PAH on at least 10% of the highest samples, including one for the used oil (C-1), tanks, and dispensers. Robert Weimer
6/17/2010 Site Visit Site visit to observe deployment of hydra sleeves, measuring of GW depth and location of monitoring wells. Brenton Porter
6/18/2010 Site Visit Site visit to observe collection of groundwater samples and use of Hydra Sleeve sampling techniques. Brenton Porter
7/12/2010 Site Characterization Workplan Approved ADEC approves Supplemental Site Assessment Workplan. The workplan calls for installing monitoring wells at C-1, at C-7 if soil contamination extends to groundwater at that location, and at C-4 if it extends to groundwater at that location but does not at C-7. Need soil borings at C-1, C-4, C-7, C-45, C-46, and C-48. Add EDB, 1,2-DCA, and PAH on at least 10% of the highest samples, including one for the used oil (C-1), tanks, and dispensers. Robert Weimer
8/27/2010 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of contaminated purge water. Robert Weimer
10/25/2010 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of contaminated purge water. Robert Weimer
11/17/2010 Offsite Soil or Groundwater Disposal Approved Approved transport and disposal of 3 drums and 1 super sack of contaminated soil at the Columbia Ridge Landfill in Arlington, Oregon. Soil was generated during the July 2010 subsurface investigation. The contaminated soil included PCBs up to 0.11 mg/kg. Robert Weimer
3/2/2011 Document, Report, or Work plan Review - other ADEC approves temporary storage of any purgewater generated in 2011 at the secure area at 1441 C Street. Robert Weimer
4/8/2011 Update or Other Action ADEC approves request for quarterly groundwater monitoring. Robert Weimer
9/8/2011 Document, Report, or Work plan Review - other ADEC approves temporary storage of drill cuttings and decon water at the secure area at 1441 C Street. Robert Weimer
9/8/2011 Document, Report, or Work plan Review - other ADEC review and approves site assessment work plan. The plan proposes to drill and sample 3 soil borings to check the current soil contamination concentrations at those locations. Robert Weimer
9/8/2011 Document, Report, or Work plan Review - other Review of Supplemental Site Assessment report. They installed a monitoring well at C-1 (MW-9). Six soil borings were sampled. Up to 0.028 mg/kg benzene, 1.7 mg/kg GRO, 280 mg/kg RRO, and 31 mg/kg DRO in the locations sampled. PAH, solvent, and PCB soil samples all met default cleanup levels. The only sample over default cleanup levels was at 12 feet below ground surface (bgs) at C-1(CB10-4) (0.028 mg/kg benzene); the soil sample collected deeper at 15 feet bgs in the same soil boring had non detect (<0.023 mg/kg) benzene. Robert Weimer
9/20/2011 Document, Report, or Work plan Review - other August 7, 2010 groundwater monitoring event. Up to 0.20 mg/l DRO, non detect (<0.5 ug/l) benzene, and non detect (<0.01 mg/l) GRO in the groundwater. PAH sample results were all non detect or below cleanup levels. Three monitoring wells were sampled (MW-3, MW-8, and MW-9). Contamination concentrations increased in the 1 of the 3 monitoring wells sampled. The groundwater flow direction is to the north. Historical groundwater flow direction was to northeast. The depth to groundwater was 35.91 to 37.59 feet below ground surface. Robert Weimer
9/21/2011 Document, Report, or Work plan Review - other March 6, 2011 groundwater monitoring event. Up to 0.15 mg/l DRO, non detect (<0.5 ug/l) benzene, and non detect (<0.01 mg/l) GRO in the groundwater. PAH sample results were all non detect or below cleanup levels. Three monitoring wells were sampled (MW-3, MW-8, and MW-9). Contamination concentrations decreased in the 3 of the 3 monitoring wells sampled. The groundwater flow direction is to the northeast. Historical groundwater flow direction was to northeast. The depth to groundwater was 37.5 to 37.8 feet below ground surface. Robert Weimer
9/22/2011 Document, Report, or Work plan Review - other May 24, 2011 groundwater monitoring event. Up to 0.2 mg/l DRO, non detect (<0.5 ug/l) benzene, and non detect (<0.01 mg/l) GRO in the groundwater. Two monitoring wells were sampled (MW-8 and MW-9). Contamination concentrations increased for DRO in the 2 of the 2 monitoring wells sampled. Historical groundwater flow direction was to northeast. The depth to groundwater was 36.2 to 37.9 feet below ground surface. Robert Weimer
9/23/2011 Document, Report, or Work plan Review - other September 20, 2011 groundwater monitoring event. Up to 0.058 mg/l DRO, non detect (<0.5 ug/l) benzene, and non detect (<0.01 mg/l) GRO in the groundwater. Three monitoring wells were sampled (MW-3, MW-8, and MW-9). Contamination concentrations decreased in the 3 of the 3 monitoring wells sampled. Historical groundwater flow direction was to northeast. The depth to groundwater was 36.8 to 38.1 feet below ground surface. Robert Weimer
10/10/2011 Update or Other Action ADEC approves request for annual groundwater monitoring. Robert Weimer
10/25/2011 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of contaminated purge water. Robert Weimer
11/4/2011 Offsite Soil or Groundwater Disposal Approved ADEC approves thermal treatment of 1 drum of contaminated drill cuttings. These were generated during the September 2011 subsurface investigation. Robert Weimer
11/9/2011 Meeting or Teleconference Held Meeting with RP's consultant CRA. They were not able to put in one of the planned borings. They plan to install that boring in 2012. Robert Weimer
3/7/2012 Meeting or Teleconference Held Meeting with Chevron and their consultants on 2/28/12. Chevron plans to continue annual groundwater monitoring. ADEC to review cleanup complete request. Robert Weimer
11/28/2012 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of contaminated purge water. Robert Weimer
2/27/2013 Meeting or Teleconference Held Meeting with Chevron and their consultants on 2/26/13. We discussed that DEC would be completing its review of the site data soon and may be able to issue a Corrective Action Complete letter for this site. The most recent groundwater monitoring events were with purged sampling. Robert Weimer
3/26/2013 Document, Report, or Work plan Review - other November 5, 2012 groundwater monitoring event. Up to 0.15 mg/l DRO, non detect (<0.5 ug/l) benzene, and non detect (<0.01 mg/l) GRO in the groundwater. EDB and 1,2-DCA sample results were non detect or below cleanup levels. Three monitoring wells were sampled (MW-3, MW-8, and MW-9). Contamination concentrations decreased in the 3 of the 3 monitoring wells sampled. The groundwater flow direction is to the northeast. Historical groundwater flow direction was to northeast. The depth to groundwater was 35.33 to 36.98 feet below ground surface. The groundwater samples were collected with a bladder pump after purging. Because the sampling depth was not documented in the report the results may be biased low and can't be used for site closure decisions. There was 1.2 to 7.8 feet of water in the monitoring wells. Robert Weimer
4/10/2013 Document, Report, or Work plan Review - other On September 19, 2011 two shallow soil borings to 3 feet below ground surface (bgs) were sampled to assess the current contaminant concentrations at those locations. Up to 0.012 mg/kg benzene, 0.7 mg/kg GRO, and 16 mg/kg DRO at the locations sampled. One boring was near the northeast dispenser island and the other near the southern dispenser island. They were not able to install the boring at the C-1(CB10-4) location that had benzene at 0.028 mg/kg benzene at 12 feet bgs when sampled in 2011. Robert Weimer
4/11/2013 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78054 1987 UST contamination. Robert Weimer
6/14/2013 Update or Other Action Chevron's request for corrective action complete with ICs is on hold pending a review and approval by the property owner for the ICs. Robert Weimer
6/18/2013 Update or Other Action Chevron will be contacting the property owner about approval for the ICs. Robert Weimer
6/28/2013 Site Visit Site visit to observe current site conditions. Robert Weimer
10/24/2013 Update or Other Action Given the remaining BTEX soil source areas that are above migration to groundwater cleanup levels, the DEC requests until further notice that monitoring wells MW-8 and MW-9 be sampled on an annual basis for BTEX. Until further notice you may suspend other sampling of the site monitoring wells. Robert Weimer
2/27/2014 Meeting or Teleconference Held Meeting with Chevron and their consultants on 2/27/2014. DEC requested continued annual groundwater monitoring because of problems with last year’s groundwater sampling. 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. The consultant will contact the property owner to move the shed so they can collect confirmation samples from that area (former used oil tank). 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
4/25/2014 Document, Report, or Work plan Review - other November 5, 2013 groundwater monitoring event. The water samples were non detect (<0.24 ug/l) for benzene in the groundwater. Two monitoring wells were sampled (MW-8 and MW-9). Contamination concentrations decreased in the 2 of the 2 monitoring wells sampled. The groundwater flow direction is to the southeast. The depth to groundwater was 34.32 to 35.98 feet below ground surface. The groundwater samples were collected by no-purge with a hydrasleeve. Because the top of the three foot sampling interval of the hydrasleeve was a foot below the soil water interface the results are considered biased low and can't be used for site closure decisions. There was 6.7 to 8.9 feet of water in the two monitoring wells sampled. Robert Weimer
4/28/2014 Meeting or Teleconference Held Discuss site status with Chevron's consultant CRA. They said that the property owner is still not agreeable to having instutional controls on his property or moving the trailer to collect confirmation soil samples below that location (MW-5). CRA will submit a revised work plan to drill two angle borings to collect confirmation samples at MW-5 near 12.5 feet below ground surface (bgs) and 34 feet bgs. They will also collect confirmation soil samples C14 just below 1 feet bgs and at C11 just below 10 feet bgs. Robert Weimer
5/5/2014 Offsite Soil or Groundwater Disposal Approved ADEC approves temporary storage of drill cuttings and decon water at the secure area at 1441 C Street. Robert Weimer
5/29/2014 Offsite Soil or Groundwater Disposal Approved ADEC approves temporary storage of 8 drums of drill cuttings at the secure area at 1441 C Street. Robert Weimer
12/15/2014 Document, Report, or Work plan Review - other Between April 30, 2014 and May 2, 2014 four soil borings were sampled at this site. Up to 66 mg/kg DRO, 0.13 mg/kg naphthalene (0.038 mg/kg 2016 cleanup level), and 0.34 mg/kg benzene in the soil samples collected. DRO results are considered biased low because they were analyzed outside of holding times. Robert Weimer
1/30/2015 Document, Report, or Work plan Review - other May 1, 2014 groundwater monitoring event. The water samples were non detect (<0.15 ug/l) for benzene in the groundwater. Two monitoring wells were sampled (MW-8 and MW-9). Contamination concentrations decreased in the 2 of the 2 monitoring wells sampled. The groundwater flow direction was not measured this event. The depth to groundwater was 35.57 to 35.81 feet below ground surface. The groundwater samples were collected by no-purge with a hydrasleeve and purge using a bladder pump. The hydrasleeve samples were collected from the top of the water column. Because the intake for the bladder pump was more than a foot below the soil water interface (they were 1.95 to 2 feet below the water surface) their results are considered biased low and can't be used for site closure decisions. Robert Weimer
1/25/2016 Update or Other Action DEC approves extension request to submit the 2015 annual groundwater monitoring report by February 29, 2016. Robert Weimer
4/12/2016 Update or Other Action DEC requests BTEX, GRO, DRO, and PAH analysis for the 2016 annual groundwater monitoring event in monitoring wells MW-8 and MW-9. DEC also requested a detailed plan for the requested decommissioning of monitoring wells MW1. MW-2, and MW-3. Robert Weimer
5/2/2016 Document, Report, or Work plan Review - other October 23, 2015 groundwater monitoring event. The water samples were non detect for benzene in the groundwater. Two monitoring wells were sampled (MW-8 and MW-9). Contamination concentrations decreased in the 2 of the 2 monitoring wells sampled. The groundwater flow direction was to the northeast this event. The depth to groundwater was 34.95 to 36.58 feet below ground surface. The groundwater samples were collected by purge using a bladder pump. The samples were collected from the top of water column as required. Robert Weimer
6/7/2017 Document, Report, or Work plan Review - other July 28 2016 groundwater monitoring event. Two monitoring wells were sampled (MW-8 and MW-9). The groundwater samples were non detect for BTEX, GRO, and PAHs. DRO was up to 0.026 mg/l. Contamination concentrations increased in the 1 of the 2 monitoring wells sampled. The groundwater flow direction was to the northeast this event. The depth to groundwater was 35.50 to 37.09 feet below ground surface. The groundwater samples were collected by purge using a bladder pump. The samples were collected from the top of water column as required. Need to include full 8260 analysis for the 2017 annual groundwater monitoring event. Robert Weimer
9/5/2017 Site Characterization Workplan Approved DEC conditionally approves May 31, 2017 site assessment work plan. The work plan proposes to collect soil samples from three borings. DEC requests that the work plan include analysis for DRO, coring device to collect undisturbed soil at boring B-1, and the deep boring include a soil sample collected at the soil/water interface. Also request that the next groundwater monitoring event include analysis for the full method 8260 list. Robert Weimer
1/8/2018 Document, Report, or Work plan Review - other October 6, 2017 groundwater monitoring event. Two monitoring wells were sampled (MW-8 and MW-9). The groundwater samples were non detect for BTEX. Contamination concentrations increased in the 0 of the 2 monitoring wells sampled. The groundwater flow direction was to the southeast this event. The depth to groundwater was 35.51 to 37.10 feet below ground surface. The groundwater samples were collected by purge using a bladder pump. The samples were collected from the top of water column as required. They did not conduct the full 8260 analysis requested. Need to include full 8260 analysis for the 2018 annual groundwater monitoring event. Robert Weimer
8/8/2018 Offsite Soil or Groundwater Disposal Approved DEC approves request to transport 10 drums of contaminated drill cuttings to ASR for thermal treatment. DEC also approves request to treat 10 gallons of monitoring well of contaminated water with granular activated carbon and discharge on property. Robert Weimer
12/4/2018 Document, Report, or Work plan Review - other On May 29-30, 2018 three soil borings were sampled and analyzed for DRO, full VOCs, and PAHs. The samples were non-detect for DRO, Benzene up to 0.007 mg/kg, Toluene up to 0.024 mg/kg, Ethylbenzene up to 0.001 mg/kg, Xylenes up to 0.016 mg/kg, and Naphthalene up to 0.006 mg/kg in the four soil samples collected, which were all below migration to groundwater cleanup levels. The other detected PAHs were also below migration to groundwater cleanup levels. Robert Weimer
4/17/2019 Document, Report, or Work plan Review - other September 6, 2018 groundwater monitoring event. Two monitoring wells were sampled (MW-8 and MW-9). The samples were analyzed for the full 8260 VOC as requested. The groundwater samples were non detect for VOCs except for Acetone 1.0 ug/l (14,000 ug/l cleanup level), Chloroform 2 ug/l, (2.2 ug/l cleanup level), and Trichlorofluoromethane 0.6 ug/l (5,200 ug/l cleanup level). Contamination concentrations increased in the 0 of the 2 monitoring wells sampled. The groundwater flow direction was to the northeast this event. The depth to groundwater was 35.67 to 37.26 feet below ground surface. The groundwater samples were collected by purge using a bladder pump. The samples were collected from the top of water column as required. Robert Weimer
5/13/2019 Update or Other Action To prepare the site for closure DEC requested a work plan for the decommissioning the remaining site monitoring wells. Robert Weimer
11/5/2019 Meeting or Teleconference Held Meeting with Chevron's consultant. They will provide a work plan for the decommissioning of the sites monitoring wells in preparation for closure without ICs. Robert Weimer
3/16/2020 Document, Report, or Work plan Review - other DEC approves monitoring well decommissioning work plan submitted on 1-21-2020. Robert Weimer
10/8/2020 Document, Report, or Work plan Review - other DEC has reviewed the Well Abandonment Report submitted by ARCADIS on September 4, 2020. This report documents the abandonment of monitoring wells MW-1 through MW-3, MW-8, and MW-9 at the site. Rebekah Reams
1/8/2021 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78054 1987 UST contamination. 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
2/9/2021 Final Cleanup Report Reviewed Following comment resolution, the DEC has no additional comments on the Revised Site Closure Request Report submitted January 20, 2021. This report summarizes site history, provides an updated conceptual site model, and presents cumulative risk calculations for the site. Rebekah Reams
3/25/2021 Cleanup Complete Determination Issued Rebekah Reams

Contaminant Information

Name Level Description Media Comments
BTEX < Method 2 Most Stringent SoilSoilSoilSoilGroundwaterGroundwaterGroundwater

Control Type

Type Details
No ICs Required

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.
Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70)
Hazard ID Site Name File Number
26240 Fairview Areawide Brownfield Assessment 2100.57.020

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