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Site Report: Texaco - #85 - Arctic

Site Name: Texaco - #85 - Arctic
Address: 810 W. Tudor Rd.; , Anchorage, AK 99503
File Number: 2100.26.105
Hazard ID: 23605
Status: Active
Staff: Alena Voigt, 9072697556 alena.voigt@alaska.gov
Latitude: 61.180487
Longitude: -149.898613
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

In 1989 a leak from the gasoline tank system was detected. The leak was repaired and 1,481 tons of gasoline contaminated soil was excavated and subsequently thermally treated. Monitoring wells were installed in 1989 with additional monitoring wells installed in subsequent years. In 1989 a soil vapor extraction system was installed and operated until the end of 2010. In 1998 a groundwater pumping system was installed and operated until the end of 2010. Jet fuel product from a nearby fuel pipeline leak was found and continues to be found in some of the site monitoring wells on the northern portion of the property. In 2004 an ORC slurry barrier wall was installed on the north side of the property. Also in 2004 they started to inject hydrogen peroxide and nutrients at the site. The groundwater is at around 35 feet below ground surface and flows to the northwest. Some of the gasoline contamination extends off property to the northwest.

Action Information

Action Date Action Description DEC Staff
2/15/1989 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77687 Gasoline contaminant. Former Staff
2/15/1989 Site Added to Database Former Staff
2/16/1989 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU Date changed DB conversion. Former Staff
6/8/1989 Document, Report, or Work plan Review - other 1,481 tons of fuel-stained soils thermally treated at Anchorage Sand & Gravel Klatt road facility. Former Staff
6/22/1989 Release Investigation Harding Lawson drinking water analysis shows none of the analytes were present in concentrations greater than method limits of detection using EPA method 503.1. Former Staff
9/19/1989 Update or Other Action Harding Lawson sends in report describing design of vapor extraction system installed at site with results of pilot test program, public health risk evaluation, and system operating plan. Former Staff
10/25/1989 Document, Report, or Work plan Review - other Anchorage Sand & Gravel sends letter stating 1,481 tons of fuel stained soils from site were processed/blended with AC-5 for use as a non spec black base material. Samples were taken during processing and are included with letter. Former Staff
11/2/1989 Underground Storage Tank Site Characterization or Assessment Reviewed a phase 1 site assessment report. Former Staff
5/16/1990 Update or Other Action Failed Petrotite test 2/3/89, workplan submitted 5/18/89. Former Staff
10/12/1990 Document, Report, or Work plan Review - other Received vapor extraction summary report for past operations at site. Former Staff
10/25/1990 Update or Other Action ADEC letter requesting that ambient air quality monitoring report be sent when available and at least 3 more monitoring wells installed. Former Staff
8/30/1993 Document, Report, or Work plan Review - other Reviewed a phase 2 site assessment report. Former Staff
1/25/1994 Document, Report, or Work plan Review - other Release investigation at service station, 5 soil borings/monitor wells. Soils up to 1.7 mg/kg benzene in MW2. Groundwater over MCL for benzene in 4 of 6 monitoring wells on-site, highest was 144 ug/l in MW West-1. Former Staff
10/11/1994 Document, Report, or Work plan Review - other Report documenting the installation of the soil vapor extraction system. Former Staff
11/20/1997 Update or Other Action ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: TEXACO REFINING & MARKETING INC. Former Staff
7/26/2000 Update or Other Action ADEC requests continued groundwater monitoring and remediation system operation. Robert Weimer
9/12/2003 Update or Other Action Approved reduction in groundwater monitoring at the site. Robert Weimer
6/7/2004 Document, Report, or Work plan Review - other Reviewed quarterly groundwater monitoring report. Up to 18,000 ug/l benzene and 57,000 ug/l GRO in groundwater. Contaminant levels appear to be increasing on some wells. Three well have product up to 0.9 feet. Robert Weimer
6/30/2004 Update or Other Action Reviewed and approved corrective action plan for ORC barrier wall. Robert Weimer
7/21/2004 Update or Other Action Reviewed and approved work plan for injection of hydrogen peroxide and nutrients. Lynne Bush
9/14/2004 Update or Other Action Approved thermal treatment of 12 drums of contaminated drill cuttings at ASR. Robert Weimer
10/21/2004 Document, Report, or Work plan Review - other Reviewed quarterly groundwater monitoring report. Up to 18,000 ug/l benzene and 41,000 ug/l GRO in groundwater. Contaminant levels appear to be decreasing in most wells. Two well have product up to 0.49 feet. Robert Weimer
11/18/2004 Document, Report, or Work plan Review - other Reviewed quarterly groundwater monitoring report. Up to 18,000 ug/l benzene and 41,000 ug/l GRO in groundwater. Contaminant levels appear to be decreasing in most wells. Two well have product up to 0.90 feet. Robert Weimer
2/14/2005 Document, Report, or Work plan Review - other Reviewed December 2004 quarterly groundwater and remediation system monitoring report. Up to 14,000 ug/l benzene and 8,900 ug/l GRO in groundwater. Contaminant levels appear to be decreasing in most wells. Two wells have product up to 0.33 feet. The soil vapor extraction/groundwater treatment system removed 54 pounds of hydrocarbons this quarter. Robert Weimer
5/17/2005 Document, Report, or Work plan Review - other Reviewed March 2005 quarterly groundwater and remediation system monitoring report. Up to 8,200 ug/l benzene and 6,200 ug/l GRO in groundwater. Contaminant levels appear to be decreasing in most wells. Two wells have product up to 0.33 feet. The soil vapor extraction/groundwater treatment system removed 19 pounds of hydrocarbons this quarter. Groundwater flow to the west by northwest. Robert Weimer
9/23/2005 Document, Report, or Work plan Review - other Reviewed June 2005 quarterly groundwater and remediation system monitoring report. Up to 4,600 ug/l benzene and 19.2 mg/l GRO in the groundwater. Contaminant levels appear to be decreasing in most wells. Two wells have product up to 0.32 feet. The soil vapor extraction/groundwater treatment system removed 11.6 pounds of hydrocarbons this quarter, and 3,660 pounds to date. Groundwater flow to the northwest. Groundwater is at approximately 32 feet below ground surface. Robert Weimer
1/13/2006 Document, Report, or Work plan Review - other Reviewed September 2005 quarterly groundwater and remediation system monitoring report. Up to 13,000 ug/l benzene and 45 mg/l GRO in the groundwater. Contaminant concentrations appear to be decreasing in most wells. Two wells have product up to 0.33 feet. The soil vapor extraction/groundwater treatment system removed 11.3 pounds of hydrocarbons this quarter, and 3,671 pounds to date. Groundwater flow to the northwest. Groundwater is at approximately 32 feet below ground surface. Currently the groundwater pumping system is down for repair. Robert Weimer
2/6/2006 Update or Other Action Received notice that recovery well RW-9 is to be cleaned this month to remove iron fouling in the well. Robert Weimer
2/21/2006 Document, Report, or Work plan Review - other Reviewed December 2005 quarterly groundwater and remediation system monitoring report. Up to 15,900 ug/l benzene and 43.9 mg/l GRO in the groundwater. Contaminant concentrations appear to be increasing in most wells. Two wells have product up to 0.33 feet. The soil vapor extraction/groundwater treatment system removed 10.25 pounds of hydrocarbons this quarter, and 3681 pounds to date. Groundwater flow is to the northwest. Groundwater is at approximately 32 feet below ground surface. The groundwater pumping system was repaired on 11/16/05. Robert Weimer
6/22/2006 Document, Report, or Work plan Review - other Reviewed March 2006 quarterly groundwater and remediation system monitoring report. Up to 14,200 ug/l benzene and 37.9 mg/l GRO in the groundwater. Contaminant concentrations appear to be decreasing. No measurable product. The soil vapor extraction/groundwater treatment system removed 19.8 pounds of hydrocarbons this quarter, and 3,700 pounds to date. Groundwater flow is to the northwest. Groundwater is at approximately 31 to 33 feet below ground surface. The groundwater pumping well (RW-9) was rehabilitated on 3/22/06. Robert Weimer
11/29/2006 Document, Report, or Work plan Review - other Reviewed June 2006 quarterly groundwater and remediation system monitoring report. Up to 17,400 ug/l benzene and 51.9 mg/l GRO in the groundwater. Contaminant concentrations appear to be increasing. No measurable product. The soil vapor extraction/groundwater treatment system removed 20.9 pounds of hydrocarbons this quarter, and 3,721 pounds to date. Groundwater flow is to the west by southwest. Groundwater is at approximately 31 to 34 feet below ground surface. The groundwater pumping well (RW-9) was rehabilitated on 3/22/06. Robert Weimer
3/6/2007 Exposure Tracking Model Ranking Initial site ranking 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
4/10/2007 Document, Report, or Work plan Review - other Reviewed December 2006 quarterly groundwater and remediation system monitoring report. Up to 20,700 ug/l benzene and 57.6 mg/l GRO in the groundwater. Contaminant concentrations appear to be increasing. Up to 0.03 feet of product in MW-6. The soil vapor extraction/groundwater treatment system removed 3,721 pounds of hydrocarbons as of June 2006. Groundwater flow is to the west. Groundwater is at approximately 31.3 to 32.4 feet below ground surface. The groundwater pumping well (RW-9) was rehabilitated on 3/22/06. Robert Weimer
5/4/2007 Update or Other Action ADEC approves request for no-purge groundwater sampling for this site. Robert Weimer
10/29/2007 Document, Report, or Work plan Review - other Reviewed March 2007 quarterly groundwater and remediation system monitoring report. Up to 14,000 ug/l benzene and 50.0 mg/l GRO in the groundwater. Contaminant concentrations appear to be decreasing. The soil vapor extraction/groundwater treatment system removed 3,721 pounds of hydrocarbons as of June 2006. Groundwater flow is to the west. Groundwater is at approximately 31.3 to 32.55 feet below ground surface. The groundwater pumping well (RW-9) was rehabilitated on 3/22/06. Robert Weimer
8/21/2008 Document, Report, or Work plan Review - other Reviewed June 2007 quarterly groundwater and remediation system monitoring report. Up to 14,700 ug/l benzene and 85.7 mg/l GRO in the groundwater. Contaminant concentrations appear to be increasing. The soil vapor extraction/groundwater treatment system removed 3,721 pounds of hydrocarbons as of June 2006. Groundwater flow is to the west by northwest. Groundwater is at approximately 31.2 to 32.35 feet below ground surface. Monitoring wells West1, MW2, and MW18 could not be sampled because they are damaged. Monitoring results may be biased low due to QA/QC problems with the samples (samples not kept cool enough). Robert Weimer
8/25/2008 Document, Report, or Work plan Review - other Reviewed September 2007 quarterly groundwater and remediation system monitoring report. Up to 14,700 ug/l benzene and 85.7 mg/l GRO in the groundwater. Contaminant concentrations appear to be increasing. The soil vapor extraction/groundwater treatment system removed 3,721 pounds of hydrocarbons as of June 2006. Groundwater flow is to the west by northwest. Groundwater is at approximately 31.51 to 32.6 feet below ground surface. Monitoring wells West1, MW17, and MW2 could not be sampled because they are damaged. Robert Weimer
8/29/2008 Document, Report, or Work plan Review - other Reviewed December 2007 quarterly groundwater and remediation system monitoring report. Up to 13,500 ug/l benzene (these results are biased low as they were analyzed outside of holding times), 5,160 ug/l TBA, 48 ug/l MTBE, and 4.51 mg/l GRO in the groundwater. Contaminant concentrations appear to be decreasing. The soil vapor extraction/groundwater treatment system removed 3,721 pounds of hydrocarbons as of June 2006. Groundwater flow is to the northwest. Groundwater is at approximately 31.32 to 32.28 feet below ground surface. Monitoring wells MW17, MW3, MW5,and MW2 could not be sampled because they are damaged. Robert Weimer
11/6/2008 Document, Report, or Work plan Review - other Reviewed March 27, 2008 quarterly groundwater and remediation system monitoring report. Up to 13,500 ug/l benzene (these results are biased low as they were analyzed outside of holding times) and 4.51 mg/l GRO in the groundwater (previous monitoring event). Contaminant concentrations appear to be decreasing. The soil vapor extraction/groundwater treatment system removed 3,721 pounds of hydrocarbons as of June 2006. Groundwater flow is to the north by northeast. Groundwater is at approximately 31.12 to 32.17 feet below ground surface. Five monitoring wells could not be sampled because they are damaged or inaccessible. The SVE system was restarted in late February 2008 after it was repaired. The groundwater treatment system is currently down for repairs. Robert Weimer
11/25/2008 Document, Report, or Work plan Review - other Reviewed June 11, 2008 quarterly groundwater and remediation system monitoring report. Up to 4 ug/l benzene (these results are biased low as they were analyzed outside of holding times) and 0.1 mg/l GRO in the groundwater. Contaminant concentrations appear to be decreasing. The soil vapor extraction/groundwater treatment system removed 3,740 pounds of hydrocarbons as of June 2008. Groundwater flow is to the west by northwest. Groundwater is at approximately 30.19 to 32.32 feet below ground surface. Eight monitoring wells were sampled this monitoring event. The SVE system was restarted in late February 2008 after it was repaired. The groundwater treatment system is currently down for repairs. Robert Weimer
1/22/2009 Document, Report, or Work plan Review - other Reviewed September 18, 2008 quarterly groundwater and remediation system monitoring report. Up to 1.4 ug/l benzene in the groundwater of the three monitoring wells sampled. Monitoring wells with past product were not sampled during this sampling event. Contaminant concentrations appear to be decreasing. The soil vapor extraction/groundwater treatment system removed 3,740 pounds of hydrocarbons as of June 2008. Groundwater flow is to the northwest. Groundwater is at approximately 30.19 to 32.32 feet below ground surface. The SVE system was restarted in late February 2008 after it was repaired. The groundwater treatment system is currently down for repairs but is expected to be restarted before the end of 2008. Robert Weimer
2/12/2009 Update or Other Action Discussed site status with Texaco's consultant. He indicated that they had shut down the remediation system. I informed him that Texaco need to continue to operate the system until approved by ADEC to stop operation. We discussed that they could request pulsing the system if recovery rates were low. If pulsing the system still had low recoveries they could request shutting down the system. We would need to evaluate remaining contamination levels to determine what corrective action would be required for the remaining contamination. We discussed that several monitoring wells have not been sampled in the past because they have been damaged. He indicated that most of them have been repaired. We discussed that the remaining damaged monitoring wells would need to be replaced or have a request approved by ADEC not to replace them. Robert Weimer
3/18/2009 Update or Other Action Discussed site status with Texaco's consultant. He indicated that they have restarted the remediation system. Texaco will continue to operate the system until approved by ADEC to stop operation. We discussed that they could request pulsing the system if recovery rates were low. Robert Weimer
4/1/2009 Document, Report, or Work plan Review - other Reviewed December 7, 2008 quarterly groundwater and remediation system monitoring report. Up to 20 ug/l benzene in the groundwater of the six monitoring wells sampled. Monitoring wells with past product were not sampled during this sampling event. Contaminant concentrations increased in two of the six monitoring wells sampled. The soil vapor extraction/groundwater treatment system removed 3,746 pounds of hydrocarbons as of December 2008. Groundwater flow is to the north by northwest. Groundwater is at approximately 30.60 to 32.00 feet below ground surface. The SVE system was restarted in late February 2008 after it was repaired. The groundwater treatment system is currently down for repairs but is expected to be restarted before the end of 2008. Robert Weimer
4/1/2009 Meeting or Teleconference Held Discussed with Texaco's consultant that the SVE system is now being pulsed on a 4 hour cycle. The groundwater pumping system is operational, but is having some problems with freezing. Robert Weimer
4/1/2009 Update or Other Action Discussed with Texaco's consultant (Delta) requesting they use updated lab QA/QC check list, they include lab sample receipt log, and not to use tedlar bags for air samples that are transported by aircraft. Robert Weimer
6/10/2009 Site Visit Site visit to observe the removal of a 550 gallon used oil tank. Robert Weimer
7/29/2009 Document, Report, or Work plan Review - other Reviewed March 26, 2009 quarterly groundwater and remediation system monitoring report. UNon-detect benzene and GRO in the groundwater of the four monitoring wells sampled. Monitoring wells with past product were not sampled during this sampling event. Contaminant concentrations decreased in the four monitoring wells sampled. The soil vapor extraction/groundwater treatment system removed 3,746 pounds of hydrocarbons as of December 2008. Groundwater flow is to the north by northwest. Groundwater is at approximately 30.78 to 31.95 feet below ground surface. The SVE system was down at the end of 2008. Robert Weimer
12/16/2009 Document, Report, or Work plan Review - other Reviewed June 11, 2009 quarterly groundwater and remediation system monitoring report. Up to 13,000 ug/l benzene, 26 ug/l MTBE, and 10.0 mg/l GRO in the groundwater of the eight monitoring wells sampled. Monitoring wells with past product were not sampled during this sampling event. Contaminant levels concentrations significantly in one of the monitoring wells sampled (MW-11). The soil vapor extraction/groundwater treatment system removed 3,746 pounds of hydrocarbons to date. Groundwater flow is to the northwest. Groundwater is at approximately 30.94 to 33.31 feet below ground surface. The SVE system was re started in February 2009 and is now on a pulsed 4 hours a day operation. Robert Weimer
12/18/2009 Document, Report, or Work plan Review - other Reviewed September 15, 2009 quarterly groundwater and remediation system monitoring report. Up to 13,000 ug/l benzene and 24.0 mg/l GRO in the groundwater of the eight monitoring wells sampled. Monitoring wells with past product were not sampled during this sampling event. Contaminant concentrations increased in four of the six monitoring wells sampled. The soil vapor extraction/groundwater treatment system removed 3,746 pounds of hydrocarbons to date. Groundwater flow is to the northwest. Groundwater is at approximately 31.40 to 32.81 feet below ground surface. The SVE system was re started in February 2009 and is now on a pulsed 4 hours a day operation. Robert Weimer
3/15/2010 Document, Report, or Work plan Review - other Reviewed December 8, 2009 quarterly groundwater and remediation system monitoring report. Up to 6.4 ug/l benzene and non-detect GRO in the groundwater of the eight monitoring wells sampled. Monitoring wells with past product were not sampled during this sampling event. Contaminant concentrations increased in 1 of the 5 monitoring wells sampled. Sheen noted in one of the monitoring wells sampled (MW-6). Monitoirng well MW-18 was noted as being broken at 9 feet below ground surface and could not be sampled. The soil vapor extraction/groundwater treatment system removed 3,746 pounds of hydrocarbons to date. Groundwater flow is to the northwest. Groundwater is at approximately 31.31 to 32.74 feet below ground surface. The SVE system was restarted in February 2009 and was pulsed 4 hours a day operation. The system was not operated dutring this quarter. Robert Weimer
6/17/2010 Document, Report, or Work plan Review - other Reviewed March 16, 2010 quarterly groundwater and remediation system monitoring report. Up to 6.4 ug/l benzene and non-detect GRO in the groundwater of the eight monitoring wells sampled. Monitoring wells with past product were not sampled during this sampling event. Contaminant concentrations increased in 0 of the 5 monitoring wells sampled. Sheen noted in one of the monitoring wells sampled (MW-4). Monitoirng well MW-18 was noted as being broken at 9 feet below ground surface and could not be sampled. Monitoirng well West-1 was noted as being broken/blocked at 3.5 feet below ground surface and could not be sampled. The soil vapor extraction/groundwater treatment system removed 3,750 pounds of hydrocarbons to date. Groundwater flow is to the northwest. Groundwater is at approximately 31.45 to 32.92 feet below ground surface. The SVE system was restarted in February 2009 and was pulsed 4 hours a day operation. The system was operated dutring this quarter. Robert Weimer
7/8/2010 Document, Report, or Work plan Review - other On July 8, 2010 product measurements were conducted on monitoring well MW-6 and MW-10 by AFSC's consultant. 0.01 feet of product was measured in MW-6 and none in MW-10. Robert Weimer
12/13/2010 Document, Report, or Work plan Review - other Reviewed May 15, 2010 quarterly groundwater and remediation system monitoring report. Up to 13,000 ug/l benzene, 22 ug/l MTBE, and 24.0 mg/l GRO in the groundwater of the five monitoring wells sampled. Monitoring wells with past product were not sampled during this sampling event. Contaminant concentrations increased in 1 of the 5 monitoring wells sampled. Thin product noted in one of the monitoring wells sampled (MW-6). Monitoirng well MW-18 was noted as being broken at 9 feet below ground surface and could not be sampled. Monitoirng well West-1 was noted as being broken/blocked at 3.5 feet below ground surface and could not be sampled. The monument cover for monitoring well MW-3 was not sampled because its cover could not be removed. Groundwater flow direction was to the west-northwest. Groundwater is at approximately 31.63 to 32.99 feet below ground surface. Need to continue to operate remediation system and conduct semi-annual groundwater monitoring. The soil vapor extraction/groundwater treatment system removed 3750 pounds of hydrocarbons to date. The SVE system was restarted in February 2009 and was pulsed 4 hours a day operation. The system was operated during this quarter. Robert Weimer
12/13/2010 Document, Report, or Work plan Review - other On October 10, 2010 product measurements were conducted on monitoring well MW-6 and MW-10 by AFSC's consultant. No product was measured in MW-6 and MW-10. Robert Weimer
12/13/2010 Meeting or Teleconference Held New consultant called (CRA) to discuss site. He mentioned that the VES blower is currently down. He will send a follow up email regarding what they will propose to address the remaining contamination at the site. Robert Weimer
8/31/2011 Document, Report, or Work plan Review - other Reviewed September 23 and October 31, 2010 quarterly groundwater monitoring report. Up to 11,000 ug/l benzene, and 19.0 mg/l GRO in the groundwater of the five monitoring wells sampled. Monitoring wells with past product were not sampled during this sampling event. Contaminant concentrations increased in 3 of the 5 monitoring wells sampled. 0.01 feet of product noted in monitoring well MW-6. Monitoirng well West-1, MW-3, MW-18, and MW-33 were not sampled because they were broken or inaccessible. Groundwater flow direction was to the west-northwest. Groundwater is at approximately 31.41 to 32.84 feet below ground surface. Groundwater samples were collected using bailers. Robert Weimer
11/28/2011 Offsite Soil or Groundwater Disposal Approved ADEC reviews and approves request to treat contaminated purgewater. Robert Weimer
1/26/2012 Document, Report, or Work plan Review - other March 8, 2011 quarterly groundwater monitoring event. Up to 6,380 ug/l benzene, and 17.6 mg/l GRO in the groundwater of the six monitoring wells sampled. Monitoring wells with past product were not sampled during this sampling event. Contaminant concentrations increased in 2 of the 6 monitoring wells sampled. No product noted in the monitoring wells, but some were not accessible due to snow. Groundwater flow direction was to the northwest. Groundwater is at approximately 31.60 to 33.00 feet below ground surface. Groundwater samples were collected using hydrasleeves. Robert Weimer
4/12/2012 Document, Report, or Work plan Review - other May 23, 2011 quarterly groundwater monitoring event. Up to 16,300 ug/l benzene, 40.1 ug/l MTBE, and 40.2 mg/l GRO (GRO results may be bias low because it was extracted and analyzed outside of holding times) in the groundwater of the six monitoring wells sampled. Monitoring wells with past product were not sampled during this sampling event. Contaminant concentrations increased in 2 of the 5 monitoring wells sampled. 0.01 feet of product noted in monitoring well MW-6, but some other monitoring wells were not accessible. Groundwater flow direction was to the northwest. Groundwater is at approximately 31 to 33 feet below ground surface. Groundwater samples were collected using hydrasleeves. 5 monitoring wells were not sampled because of well obstructions or well caps that couldn't be removed, those monitoring wells need to be repaired. Robert Weimer
7/16/2012 Document, Report, or Work plan Review - other July 28, 2011 quarterly groundwater monitoring event. Up to 9,960 ug/l benzene and 25.2 mg/l GRO in the groundwater of the five monitoring wells sampled. Monitoring wells with past product were not sampled during this sampling event. Contaminant concentrations increased in 0 of the 5 monitoring wells sampled. 0.01 feet of product noted in monitoring well MW-6 and 0.11 feet of product in MW-4, but some other monitoring wells were not accessible. Groundwater flow direction was to the west by northwest. Groundwater is at approximately 31 to 33 feet below ground surface. Groundwater samples were collected using hydrasleeves. 3 monitoring wells were not sampled because of well obstructions or well caps that couldn't be removed, those monitoring wells need to be repaired. Robert Weimer
9/14/2012 Document, Report, or Work plan Review - other October 10, 2011 quarterly groundwater monitoring event. Up to 6,200 ug/l benzene and 14.8 mg/l GRO in the groundwater of the five monitoring wells sampled. Monitoring wells with past product were not sampled during this sampling event. Contaminant concentrations increased in 0 of the 5 monitoring wells sampled. No product noted this monitoring event. Groundwater flow direction was to the northwest. Groundwater is at approximately 31 to 33 feet below ground surface. Groundwater samples were collected using a bladder pump. 5 monitoring wells were not sampled because of well obstructions or well caps that couldn't be removed, those monitoring wells need to be repaired. Robert Weimer
10/30/2012 Offsite Soil or Groundwater Disposal Approved ADEC approves request for transport and treatment of 1 drum of contaminated monitoring well purge water. Robert Weimer
2/13/2013 Document, Report, or Work plan Review - other April 25, 2012 quarterly groundwater monitoring event. Up to 6,200 ug/l benzene and 14.8 mg/l GRO in the groundwater of the five monitoring wells sampled. Monitoring wells with past product were not sampled during this sampling event. Contaminant concentrations increased in 0 of the 5 monitoring wells sampled. No product noted this monitoring event. Groundwater flow direction was to the northwest. Groundwater is at approximately 31 to 33 feet below ground surface. Groundwater samples were collected using a bladder pump. 5 monitoring wells were not sampled because of well obstructions or well caps that couldn't be removed, those monitoring wells need to be repaired. Robert Weimer
3/22/2013 Update or Other Action DEC is requesting that all sites where there has been no purge groundwater sampling conducted during the last year, that for the next sampling event that they do both no purge then purge sampling from each monitoring well, so we evaluate on a site specific basis whether no purge sampling has provided comparable data. The post purge well sampling for VOCs would need to be conducted via hydrasleeve, bladder pump, or in well pump. Non VOC sampling can be collected with a bailer or peristaltic pump (in addition to the VOC methods) if desired. The specific sampling methods will need to be documented in the report and included field notes. If there is not enough time to do this adjustment for the planned sample event of March 26-April 4, then we request it be done on the following event. Robert Weimer
4/1/2013 Document, Report, or Work plan Review - other June 15, 2012 quarterly groundwater monitoring event. Up to 12,200 ug/l benzene and 46.4 mg/l GRO in the groundwater of the four monitoring wells sampled. Monitoring wells with past product were not sampled during this sampling event. Contaminant concentrations increased in 1 of the 4 monitoring wells sampled. Product noted in monitoring well MW-4 (0.05 feet). Groundwater flow direction was to the northwest. Groundwater is at approximately 31 to 32 feet below ground surface. Groundwater samples were collected using a bladder pump and were purged prior to sampling. 3 monitoring wells were not sampled because of well obstructions or well caps that couldn't be removed, those monitoring wells need to be repaired. Robert Weimer
4/18/2013 Document, Report, or Work plan Review - other August 17, 2012 quarterly groundwater monitoring event. Up to 26.7 mg/l GRO in the groundwater of the four monitoring wells sampled. Monitoring wells with past product were not sampled during this sampling event. Contaminant concentrations increased in 0 of the 4 monitoring wells sampled. Product noted in no monitoring wells this event. Groundwater flow direction was to the northwest. Groundwater is at approximately 31 to 33 feet below ground surface. Groundwater samples were collected using a bladder pump and were purged prior to sampling. 3 monitoring wells were not sampled because of well obstructions or well caps that couldn't be removed, those monitoring wells need to be repaired. Robert Weimer
5/8/2013 Update or Other Action DEC confirmed that since the previous groundwater samples were collected after purging since October 10, 2011, that the DEC is not requesting a purge/no purge comparison sampling event for this site. Robert Weimer
5/21/2013 Document, Report, or Work plan Review - other October 28, 2012 quarterly groundwater monitoring event. Up to 22.1 mg/l GRO and 10,900 ug/l benzene in the groundwater of the four monitoring wells sampled. Monitoring wells with past product were not sampled during this sampling event. Contaminant concentrations increased in 1 of the 3 monitoring wells sampled. Product noted in no monitoring wells this event. Groundwater flow direction was to the northwest. Groundwater is at approximately 31.2 to 32.4 feet below ground surface. Groundwater samples were collected using a bladder pump and were purged prior to sampling. 3 monitoring wells were not sampled because of well obstructions or well caps that couldn't be removed, those monitoring wells need to be repaired. Robert Weimer
9/26/2013 Meeting or Teleconference Held Discussed site status and future site work with Shell and their consultant. The groundwater pumping system and VES system have been off since end of 2010. AFSC has been monitoring product in monitoring wells MW-4 and MW-6. After Shell gets the results of the 4th quarter 2013 groundwater monitoring event they will submit a request for possible reduction in groundwater monitoring at this site. They still have high concentrations in the groundwater in MW-11, if that continues they may need to do enhanced or active treatment of the soil and groundwater in that area. Robert Weimer
12/13/2013 Document, Report, or Work plan Review - other March 30 and April 1, 2013 quarterly groundwater monitoring event. Up to 15.9 mg/l GRO and 6,900 ug/l benzene in the groundwater of the four monitoring wells sampled. Contaminant concentrations increased in 1 of the 4 monitoring wells sampled. Product noted in no monitoring wells this event. Groundwater flow direction was to the southwest. Groundwater is at approximately 31.07 to 32.31 feet below ground surface. Groundwater samples were collected using a bladder pump and were purged prior to sampling. Robert Weimer
3/7/2014 Document, Report, or Work plan Review - other June 13, 2013 quarterly groundwater monitoring event. Up to 23.2 mg/l GRO and 6,990 ug/l benzene in the groundwater of the four monitoring wells sampled. Contaminant concentrations increased in 1 of the 4 monitoring wells sampled. Product noted in no monitoring wells this event. Groundwater flow direction was to the northwest. Groundwater is at approximately 31 to 32 feet below ground surface. Groundwater samples were collected using a bladder pump and were purged prior to sampling, but the results may be baised low since the depth sampled was not documented in the report or field notes. Robert Weimer
3/10/2014 Document, Report, or Work plan Review - other August 8, 2013 quarterly groundwater monitoring event. Up to 14.7 mg/l GRO, 3.87 mg/l DRO, non-detect RRO, and 8,720 ug/l benzene in the groundwater of the four monitoring wells sampled. Contaminant concentrations increased in 1 of the 4 monitoring wells sampled. Product noted in no monitoring wells this event. Groundwater flow direction was to the northwest. Groundwater is at approximately 31 to 32 feet below ground surface. Groundwater samples were collected using a bladder pump and were purged prior to sampling, but the results may be baised low since the depth sampled was not documented in the report or field notes. Robert Weimer
5/6/2014 Document, Report, or Work plan Review - other October 10, 2013 quarterly groundwater monitoring event. Up to 21 mg/l GRO, 7,640 ug/l benzene, and non-detect DRO, and RRO in the groundwater of the four monitoring wells sampled. Contaminant concentrations increased in 1 of the 4 monitoring wells sampled. Product noted in no monitoring wells this event. Groundwater flow direction was to the northwest. Groundwater is at approximately 15 to 31 feet below ground surface. Groundwater samples were collected using a bladder pump and were purged prior to sampling, but the results may be baised low since the depth sampled was not documented in the report or field notes. Robert Weimer
8/8/2014 Offsite Soil or Groundwater Disposal Approved ADEC approves request for transport and treatment of 2 drums of contaminated monitoring well purge water. Robert Weimer
10/20/2014 Offsite Soil or Groundwater Disposal Approved ADEC approves request to treat 1 drum of contaminated purge water. Robert Weimer
4/20/2015 Document, Report, or Work plan Review - other April 7, 2014 groundwater monitoring event. Up to 11.8 mg/l GRO and 5,320 ug/l benzene in the groundwater of the four monitoring wells sampled. Contaminant concentrations increased in 0 of the 4 monitoring wells sampled. Product noted in no monitoring wells this event. Groundwater flow direction was to the northwest. Groundwater is at 29.91 to 31.19 feet below ground surface. Groundwater samples were collected using a bladder pump and were purged prior to sampling. The results from monitoring well MW-19 are considered biased low since the depth of the pump intake was 1.44 feet below the soil/water interface, the other monitoring wells were collected within the top foot of the water column. Robert Weimer
6/22/2015 Document, Report, or Work plan Review - other June 18, 2014 groundwater monitoring event. Up to 12.7 mg/l GRO and 7,370 ug/l benzene in the groundwater of the four monitoring wells sampled. Contaminant concentrations increased in 1 of the 6 monitoring wells sampled. Product noted in no monitoring wells this event. Groundwater flow direction was to the northwest. Groundwater is at 29.31 to 31.02 feet below ground surface. Groundwater samples were collected using a bladder pump and were purged prior to sampling. The samples were collected from near the soil/water interface as required. Robert Weimer
6/23/2015 Document, Report, or Work plan Review - other August 12, 2014 groundwater monitoring event. Up to 18.2 mg/l GRO and 7,640 ug/l benzene in the groundwater of the four monitoring wells sampled. Contaminant concentrations increased in 2 of the 5 monitoring wells sampled. Product noted in no monitoring wells this event. Groundwater flow direction was to the northwest. Groundwater is at 29.16 to 30.90 feet below ground surface. Groundwater samples were collected using a bladder pump and were purged prior to sampling. The samples were collected from near the soil/water interface as required. Robert Weimer
7/8/2015 Document, Report, or Work plan Review - other October 6, 2014 groundwater monitoring event. Up to 19.2 mg/l GRO and 5,350 ug/l benzene in the groundwater of the five monitoring wells sampled. Contaminant concentrations increased in 1 of the 5 monitoring wells sampled. Product noted in no monitoring wells this event. Groundwater flow direction was to the northwest. Groundwater is at 29.54 to 30.82 feet below ground surface. Groundwater samples were collected using a bladder pump and were purged prior to sampling. The samples were collected from near the soil/water interface as required. Robert Weimer
1/28/2016 Document, Report, or Work plan Review - other March 23, 2015 groundwater monitoring event. Up to 10.1 mg/l GRO, 0.0596 mg/kg DRO, 0.114 mg/kg RRO, and 5,580 ug/l benzene in the groundwater of the five monitoring wells sampled. Contaminant concentrations increased in 1 of the 5 monitoring wells sampled. Product noted in no monitoring wells this event. Groundwater flow direction was to the northwest. Groundwater is at 29.75 to 31.82 feet below ground surface. Groundwater samples were collected using a bladder pump and were purged prior to sampling. The samples were collected from near the soil/water interface as required. Monitoring wells MW3, MW6, and MW33 were not sampled because they were not accessible or could not be located. Robert Weimer
2/9/2016 Document, Report, or Work plan Review - other June 2, 2015 groundwater monitoring event. Up to 14.2 mg/l GRO, 0.0724 mg/kg DRO, 0.143 mg/kg RRO, and 7,390 ug/l benzene in the groundwater of the four monitoring wells sampled. Contaminant concentrations increased in 1 of the 4 monitoring wells sampled. Product noted in no monitoring wells this event. Groundwater flow direction was west to the northwest. Groundwater is at 29.65 to 31.40 feet below ground surface. Groundwater samples were collected using a bladder pump and were purged prior to sampling. The samples were collected from near the soil/water interface as required. Monitoring wells MW3, MW6, and MW33 were not sampled because they were not accessible or could not be located. Robert Weimer
2/16/2016 Document, Report, or Work plan Review - other August 22, 2015 groundwater monitoring event. Up to 0.682 mg/l GRO, 0.182 mg/kg DRO, 0.359 mg/kg RRO, and 7,320 ug/l benzene in the groundwater of the five monitoring wells sampled. Contaminant concentrations increased in 2 of the 5 monitoring wells sampled. Product noted in no monitoring wells this event. Groundwater flow direction was to the northwest. Groundwater is at 29.95 to 31.75 feet below ground surface. Groundwater samples were collected using a submersible pump and were purged prior to sampling. The samples were collected from near the soil/water interface as required. Monitoring wells MW6 and MW33 were not sampled because they were dry (MW-6) or not located (MW33). Robert Weimer
3/15/2016 Meeting or Teleconference Held Teleconference with Shell and their consultant (GES) to discuss future site work for site closure. They will submit a work plan for the 2016 groundwater monitoring that will include analysis for PAHs. We discussed that since contamination was left at the site over the maximum allowable concentrations those areas will need confirmation soil samples in the future demonstrating it has been remediated below levels for closure with ICs. DEC requested a corrective action plan for enhanced or active treatment of the contaminated area that included MW-11. DEC requested rose diagrams showing historical groundwater flow directions be included in future site monitoring report maps. Robert Weimer
7/25/2016 Document, Report, or Work plan Review - other October 25, 2015 groundwater monitoring event. Up to 11.7 mg/l GRO, 0.725 mg/kg DRO, 0.154 mg/kg RRO, and 9,700 ug/l benzene in the groundwater of the five monitoring wells sampled. Contaminant concentrations increased in 2 of the 5 monitoring wells sampled. Product noted in no monitoring wells this event. Groundwater flow direction was to the northwest. Groundwater is at 30.00 to 31.72 feet below ground surface. Groundwater samples were collected using a submersible pump and were purged prior to sampling. The samples were collected from near the soil/water interface as required. Monitoring wells MW6 and MW33 were not sampled because they were dry (MW-6) or not located (MW33). Robert Weimer
7/27/2016 Document, Report, or Work plan Review - other DEC requested revised work plan for PAH sampling of selected monitoring wells at this site to help assess current concentrations in the groundwater. Robert Weimer
8/3/2016 Meeting or Teleconference Held Teleconference with Shell and their consultant (GES) to discuss future site work for site closure. They will submit a revised work plan for the September/October 2016 groundwater monitoring to include PAHs. Rose diagrams showing historical groundwater flow directions are to be included in future site monitoring report maps. They will document which monitoring wells are damaged or not accessible, so they can be repaired, decommissioned, or possibly replaced. We discussed that since contamination was left at the site over the maximum allowable concentrations those areas will need confirmation soil samples in the future demonstrating it has been remediated below levels for closure with ICs. DEC requested a corrective action plan for enhanced or active treatment of the contaminated area that included MW-11. Robert Weimer
12/6/2016 Document, Report, or Work plan Review - other March 29, 2016 groundwater monitoring event. Up to 13.0 mg/l GRO, 0.263 mg/kg DRO, 0.0985 mg/kg RRO, and 6,320 ug/l benzene in the groundwater of the two monitoring wells sampled. Contaminant concentrations increased in 2 of the 2 monitoring wells sampled. Product noted in no monitoring wells this event. Groundwater flow direction was to the northwest. Groundwater is at 30.35 to 31.75 feet below ground surface. Groundwater samples were collected using a bladder pump and were purged prior to sampling. The samples were collected from near the soil/water interface as required. Monitoring wells MW-3, MW-6, MW-10, and MW-17 were not sampled because of rainwater buildup (MW-3), dry (MW-6), or not located (MW-10 and MW-17). Robert Weimer
12/9/2016 Document, Report, or Work plan Review - other September 27, 2016 groundwater monitoring event. Up to 19.8 mg/l GRO, 7,770 ug/l benzene and non-detect DRO, RRO, and PAH in the groundwater of the four monitoring wells sampled. Contaminant concentrations increased in 1 of the 4 monitoring wells sampled. Product noted in no monitoring wells this event. Groundwater flow direction was to the northwest. Groundwater is at 30.4 to 32.15 feet below ground surface. Groundwater samples were collected using a bladder pump and were purged prior to sampling. The samples were collected from near the soil/water interface as required. Robert Weimer
12/14/2016 Document, Report, or Work plan Review - other Review enhanced fluid recovery work plan. They propose to pump 150 gallons of water from monitoring well MW-11 to help enhance the remediation of that area of the site. Need a revised work plan with a separate treatment/disposal form of the contaminated water and specify how long they are going to wait to sample the monitoring well after pumping. Robert Weimer
12/15/2016 Meeting or Teleconference Held Teleconference with Shells consultant (GES) to discuss future site work for site closure. We discussed that the extent of the soil and groundwater contamination needs to be characterized before a site can be considered for closure. They will submit a proposal for DEC approval regarding future groundwater monitoring. They will submit and updated PAH sampling report with method detection limits. DEC is requesting a revised work plan for enhanced fluid recovery in monitoring well MW-11. Robert Weimer
4/12/2017 Document, Report, or Work plan Review - other Review and approval of the April 11, 2017 revised enhanced fluid recovery work plan. They propose to pump 150 gallons of water from monitoring well MW-11 to help enhance the remediation of that area of the site. Robert Weimer
4/21/2017 Update or Other Action Updated report for the September 27, 2016 groundwater monitoring event. Up to 19.8 mg/l GRO, 7,770 ug/l benzene, 0.037 ug/l Dibenzo(a,h)anthracene (0.034 ug/l 2017 cleanup level), 1.0 ug/l Naphthalene (1.7 ug/l 2017 cleanup level), other PAHs were non-detect or below 2017 cleanup levels, and non-detect DRO and RRO in the groundwater of the four monitoring wells sampled. PAHs were detected in monitoring wells MW-11 and MW-4. Contaminant concentrations increased in 1 of the 4 monitoring wells sampled. Product noted in no monitoring wells this event. Groundwater flow direction was to the northwest. Groundwater is at 30.4 to 32.15 feet below ground surface. Groundwater samples were collected using a bladder pump and were purged prior to sampling. The samples were collected from near the soil/water interface as required. Robert Weimer
4/21/2017 Update or Other Action DEC approves request to reduce groundwater monitoring to semi-annual in just monitoring wells MW-4 and MW-11 for full VOCs, GRO, DRO, RRO, and PAHs. DEC requests that the condition of all monitoring, recovery wells, and VES wells on the property be assessed during the next monitoring event along with recommendations as to which monitoring wells should be properly decommissioned, repaired, redeveloped, and/or replaced. Robert Weimer
8/3/2017 Document, Report, or Work plan Review - other April 18, 2017 groundwater monitoring event. Up to 7.09 mg/l GRO, 7,090 ug/l benzene, 1.22 mg/l DRO, 0.584 mg/l RRO, 16.2 ug/l ethylbenzene, 49.4 ug/l MTBE (140 ug/l 2017 cleanup level), 14.4 ug/l 1,2,4-Trimethylbenzene (15 ug/l 2017 cleanup level), (MW-11) 434 ug/l 1,2-Dichloroethene (1.7 ug/l 2017 cleanup level), non-detect (<0.05 ug/l) Dibenzo(a,h)anthracene (0.034 ug/l 2017 cleanup level), (MW-4) 12.3 ug/l Naphthalene (1.7 ug/l 2017 cleanup level), other PAHs were non-detect or below 2017 cleanup levels in the groundwater of the two monitoring wells sampled (MW-4 and MW-11). MW-11 was the only monitoring well sampled for full PAHs this monitoring event, MW4 had Naphthalene from the 8260 analysis. Contaminant concentrations increased in 1 of the 4 monitoring wells sampled. Product noted in no monitoring wells this event. Groundwater flow direction was to the northwest. Groundwater is at 30.75 to 32.29 feet below ground surface. Groundwater samples were collected using a bladder pump and were purged prior to sampling. The samples were collected from near the soil/water interface as required. Since the groundwater samples were received two days after sampling above temperature (10.1 degrees C) the results are considered biased low. Robert Weimer
8/3/2017 Document, Report, or Work plan Review - other On April 20, 2017 approximately 157 gallons of groundwater were pumped out of monitoring well MW-11 to enhance the remediation in that area. The drawdown during the 80 minute pumping event was 0.57 feet. The pumped contaminated water was treated at NRC in accordance with the approved work plan. Robert Weimer
8/8/2017 Meeting or Teleconference Held Meeting with Shell with Shells consultant (GES) to discuss future site work for site closure. We discussed that there is still some contamination over cleanup levels in the down gradient monitoring well MW-4 and high concentrations in MW-11. GES will evaluate that condition of the site monitoring wells and provide recommendations as to which ones that should be decommissioned. GES is interested in getting information as to which off property monitoring wells have been decommissioned by AFSC. Groundwater monitoring of monitoring wells MW-4 and MW-11 is to continue. Robert Weimer
9/25/2017 Offsite Soil or Groundwater Disposal Approved DEC approves request to transport approximately 150 gallons of groundwater to pumped out of monitoring well MW-11 to enhance the remediation in that area. Robert Weimer
12/12/2017 Document, Report, or Work plan Review - other October 2, 2017 groundwater monitoring event. Up to 7.05 mg/l GRO, 6,010 ug/l benzene, 0.598 mg/l DRO, 0.482 mg/l RRO, 14.0 ug/l ethylbenzene, 48.9 ug/l MTBE (140 ug/l 2017 cleanup level), 35.5 ug/l 1,2,4-Trimethylbenzene (15 ug/l 2017 cleanup level), (MW-11) 372 ug/l 1,2-Dichloroethene (1.7 ug/l 2017 cleanup level), non-detect (<0.00454 ug/l) Dibenzo(a,h)anthracene (0.034 ug/l 2017 cleanup level), (MW-4) 23.6 ug/l Naphthalene (1.7 ug/l 2017 cleanup level), other PAHs were non-detect or below 2017 cleanup levels in the groundwater of the two monitoring wells sampled (MW-4 and MW-11). Both samples were analyzed for full the PAHs (8270) and full VOCs (8260) this monitoring event. Contaminant concentrations increased in 1 of the 2 monitoring wells sampled. Product noted in no monitoring wells this event. Groundwater flow direction was to the north by northwest. Groundwater is at 30.73 to 32.43 feet below ground surface. Groundwater samples were collected using a bladder pump and were purged prior to sampling. The samples were collected from near the soil/water interface as required. The Naphthalene results in monitoring well MW-4 were 23.6 ug/l by method 8260 and 13.4 ug/l by method 8270. Robert Weimer
12/12/2017 Document, Report, or Work plan Review - other On September, 2017 (about 1 week prior to the October 2, 2017 groundwater monitoring event) approximately 135 gallons of groundwater were pumped out of monitoring well MW-11 to enhance the remediation in that area. The drawdown during the 45 minute pumping event was 0.46 feet. The pumped contaminated water was treated at NRC in accordance with the approved work plan. Since there was not a significant decrease in the concentrations in that monitoring well from pervious events they do not plan on conducting additional pumping events. Robert Weimer
12/22/2017 Meeting or Teleconference Held Teleconference with Shell with Shells consultant (GES) to discuss future site work for site closure. We discussed that there is still some contamination over cleanup levels in the down gradient monitoring well MW-4 and high concentrations in MW-11. GES will evaluate that condition of the site monitoring wells and provide recommendations as to which ones that should be decommissioned. DEC to review this site for closure with ICs, if it meets criteria will need property owner to sign IC document and decommissioning of monitoring wells. Robert Weimer
4/18/2018 Meeting or Teleconference Held Teleconference with Shell with Shells consultant (GES) to discuss future site work for site closure. We discussed that there is still some contamination over cleanup levels in the down gradient monitoring well MW-4 and high concentrations in MW-11. GES will evaluate that condition of the site monitoring wells and provide recommendations as to which ones that should be decommissioned. Robert Weimer
8/15/2018 Meeting or Teleconference Held Meeting with Shell with Shells consultant (GES) to discuss future site work for site closure. We discussed that there is still some contamination over cleanup levels in the down gradient monitoring well MW-4, high concentrations in MW-11, and other monitoring wells that need groundwater monitoring to evaluate them for decommissioning. DEC requests that during the next groundwater monitoring event that monitoring wells MW4, 6, 10, and either RW-9 or 33 be sampled for full VOCs, GRO, DRO, and PAHs. Monitoring well MW11 is to be sampled for full VOCs, GRO, and PAHs. They said that monitoring wells MW10, 17, and 33 were not visible at the surface but they would locate them for sampling/future decommissioning. On all sites GES will provide a diagram showing the remaining soil contamination above migration to groundwater, human health, and maximum allowable cleanup levels. Robert Weimer
2/12/2019 Document, Report, or Work plan Review - other October 3-5, 2018 groundwater monitoring event. Up to 5.45 mg/l GRO, 5,880 ug/l benzene, 1.94mg/l DRO, 0.461 mg/l RRO, 23.7 ug/l ethylbenzene, 9.18 ug/l toluene, 50.6 ug/l xylenes, 54.4 ug/l MTBE (140 ug/l current cleanup level), 114 ug/l 1,2,4-Trimethylbenzene (15 ug/l current cleanup level), 27.0 ug/l 1,2,3-Trimethylbenzene, 24.8 1,3,5-Trimethylbenze, 408 ug/l 1,2-Dichloroethene (1.7 ug/l current cleanup level), (MW-4) 30.2 ug/l Naphthalene (1.7 ug/l 2017 cleanup level), other PAHs were non-detect or below 2017 cleanup levels in the groundwater of the two monitoring wells sampled (MW-4 and MW-11). Both samples were analyzed for full the PAHs (8270) and full VOCs (8260) this monitoring event. Contaminant concentrations increased in 2 of the 2 monitoring wells sampled. Product noted in no monitoring wells this event. Groundwater flow direction was to the north by northwest. Groundwater was at 31.1 to 32.54 feet below ground surface. Groundwater samples were collected using a bladder pump and were purged prior to sampling. They could not locate monitoring wells MW-3, MW-10, MW-17, and MW-33 this monitoring event. Monitoring well RW-19 was found but not accessible this monitoring event. The consultant proposes to sample monitoring well MW-4, MW-11, and RW-19 on an annual basis and decommission all of the other monitoring wells.The field notes did not document the interval sampled in both monitoring wells so the results may be biased low if they were not collected in the top foot of the water column as required. Robert Weimer
8/8/2019 Document, Report, or Work plan Review - other April 5, 2019 groundwater monitoring event. Up to 4.42 mg/l GRO, 5,050 ug/l benzene, 0.742 mg/l DRO, 17.3 ug/l ethylbenzene, 44.4 ug/l xylenes, (MW-4) 25.3 ug/l Naphthalene (1.7 ug/l 2017 cleanup level), other PAHs were non-detect or below 2017 cleanup levels in the groundwater of the three monitoring wells sampled (RW-9, MW-4, and MW-11). The samples were analyzed for full the PAHs (8270) and full VOCs (8260) this monitoring event. Contaminant concentrations increased in 1 of the 3 monitoring wells sampled. Product noted in no monitoring wells this event. Groundwater flow direction was to the northwest. Groundwater was at 29.27 to 32.52 feet below ground surface. Groundwater samples were collected using a bladder pump and were purged prior to sampling. The consultant proposes to sample monitoring well MW-4, MW-11, and RW-19 on an annual basis and decommission all of the other monitoring wells. Samples were collected from the top foot of the water column as required. Robert Weimer
8/28/2019 Meeting or Teleconference Held Meeting with Shell with Shells consultant (GES) to discuss future site work for site closure. We discussed that there is still some contamination over cleanup levels in the down gradient monitoring well MW-4, high concentrations in MW-11, and other monitoring wells that need groundwater monitoring to evaluate them for decommissioning. DEC requests that during the next groundwater monitoring event that monitoring wells MW4, 6, 10 be sampled for full VOCs, GRO, DRO, and PAHs. Monitoring well MW11 is to be sampled for full VOCs, GRO, and PAHs. They said that monitoring wells MW10, 17, and 33 were not visible at the surface but they would locate them for sampling/future decommissioning. They said they were told that monitoring wells MW10 and MW17 were removed during the burying of electrical lines a few years ago. GES is to get documentation on how/if they were decommissioned from the contractor or the Municipality of Anchorage. GES will provide a diagram showing the remaining soil contamination above migration to groundwater, human health, and maximum allowable cleanup levels. GES is to locate all of the site monitoring wells, which will all need to be decommissioned in accordance with an approved plan when it is time for IC closure. DEC is to look at past sample results from monitoring wells MW-7 and MW-8 to see if the contamination has been defined downgradient of monitoring well MW4. Robert Weimer
8/24/2020 Meeting or Teleconference Held Meeting with Shell and their consultant, GES to discuss site conditions, pending actions and future work at multiple sites. It was discussed that sites must be characterized both vertically and horizontally in all contaminated media to move forward with site closure with institutional controls (ICs). To move forward with site closure with ICs would also require landowner and stakeholder concurrence and the required documentation under the Uniform Environmental Covenants Act. Other discussions involved what steps needed to be taken to continue monitoring and sampling where necessary. Randy Guintu
4/21/2023 Site Characterization Report Approved Alaska Department of Environmental Conservation’s (ADEC) Contaminated Sites Program (CSP) reviewed the “First Semiannual 2022 Groundwater Monitoring and Well Decommissioning Report”, dated September 23, 2022, and submitted to the department on same day from Groundwater & Environmental Services, Inc. (GES). On May 25, 2022 GES oversaw the replacement of a monitoring well at the AFS Cross-town Pipeline Arctic & Tudor contaminated site, following the unauthorized abandonment of MW-30 in October 2021. The replacement well, MW30R, will be used for continued groundwater monitoring at the neighboring contaminated site. On the Texaco - #85 - Arctic property, four groundwater samples, including a duplicate, were collected from monitoring wells MW-4, MW-6, and MW-11 and analyzed for gasoline range organics (GRO) via Alaska Series Method AK (AK) 101, diesel range organics (DRO) via Method AK 102/103, volatile organic compounds (VOCs) via United States Environmental Protection Agency (EPA) Method 8021/8260C, and polycyclic aromatic hydrocarbons (PAHs) via EPA Method 8270D-SIM. Monitoring well MW-11 contained estimated concentrations of benzene (724 J µg/L) and 1,2, dichloroethane (233 J g/L) above the ADEC Table C groundwater cleanup levels of 4.6 µg/L and 1.7 µg/L, respectively. The remaining tested analytes were either not detected or were detected at concentrations less than the applicable cleanup levels. Groundwater flow direction is to the north. Alena Voigt
5/1/2023 Site Characterization Report Approved The ADEC CSP reviewed the “Second Semiannual 2022 Groundwater Monitoring Report”, dated January 12, 2023, and submitted to the department on same day from Groundwater & Environmental Services, Inc. (GES). Four groundwater samples, including a duplicate, were collected from Monitoring Wells MW-4, MW-6, and MW-11, and analyzed for GRO via AK 101, DRO via AK 102/103, VOCs via EPA Method 8021/8260C, and PAHs via EPA Method 8270D SIM. Monitoring Well MW-11 contained estimated concentrations of benzene (1,680 J micrograms per liter [µg/L]), 1,2-dichloroethane (277 J µg/L), and 1,1,2-trichloroethane (277 J µg/L) above the ADEC Table C cleanup level of 4.6 µg/L, 1.7 µg/L, and 0.41 µg/L respectively. Monitoring Well MW-4 contained concentrations and naphthalene (20.3 µg/L) above the ADEC Table C cleanup level of 1.7 µg/L. In addition, Monitoring Well-11 contained concentrations of GRO (2,980 µg/L) above the ADEC Table C cleanup level of 2,200 µg/L. The remaining tested analytes were either not detected or were detected at concentrations less than the applicable cleanup levels. The next semiannual sampling event is scheduled to take place in May 2023. Alena Voigt
8/31/2023 Update or Other Action The ADEC CSP reviewed the “First Semiannual 2023 Groundwater Monitoring Report”, dated July 14, 2023, and submitted to the department on same day from Groundwater & Environmental Services, Inc. (GES). The ADEC provided comments to the responsible party and environmental consultant and requested a revised report be submitted to the CSP for review. Alena Voigt
9/29/2023 Meeting or Teleconference Held Teleconference held with GES, Shell, ADEC PM and Supervisor regarding site and path towards closure. Alena Voigt
3/29/2024 Site Characterization Report Approved ADEC CSP reviewed revised “First Semiannual 2023 Groundwater Monitoring Report”, dated July 14, 2023, and submitted to the department on same day from Groundwater & Environmental Services, Inc. (GES). An email was sent on December 26, 2023 to GES requesting the final lab data with the project managers signature. The final lab data was received on February 16, 2024. Monitoring Wells MW-4, MW-6, and MW-11, and analyzed for GRO, DRO, RRO, VOCs, nitrate/nitrite, iron, manganese, sulfate, methane, and total organic compounds. Monitoring Well MW-11 primary and duplicate samples contained concentrations of benzene (maximum of 794 micrograms per liter [µg/L]), 1,2-dichloroethane (maximum of 163 µg/L) and manganese (maximum of 2,300 µg/L) above the ADEC Table C cleanup level of 4.6 µg/L, 1.7 µg/L, and 430 µg/L respectively. Monitoring Well MW-4 contained concentrations and naphthalene (4.76 µg/L) and RRO (3,120 µg/L) above the ADEC Table C cleanup level of 1.7 µg/L and 1,100 µg/L, respectively. Purge water was filtered through a portable granular activated carbon (GAC) filter and discharged to the ADEC approved designated location. The remaining tested analytes were either not detected or were detected at concentrations less than the applicable cleanup levels. Groundwater flow direction is to the north. Alena Voigt
5/21/2024 Update or Other Action Reviewed "Revised Groundwater Monitoring Working Plan", dated April 10, 2024. The work plan recommends removing PAHs from the analytical sampling list. According to the most recent results of the semiannual sampling, the only PAHs detected above a ADEC Cleanup Level since 2016 has been naphthalene, which is also an analyte in the volatile organic compounds (VOCs) 8260 analysis. Groundwater monitoring wells MW-4, MW-6, and MW-11 will be sampled on an annual schedule (second quarter of the year) and analyzed for GRO, DRO, RRO, and VOCs. Alena Voigt
5/28/2024 Site Characterization Report Approved Reviewed "Second Semiannual 2023 Groundwater Monitoring Report”, dated January 23, 2024, and submitted to the department on March 27, 2024. Four groundwater samples, including a duplicate, were collected from Monitoring Wells MW-4, MW-6, and MW-11, and analyzed for GRO, DRO, RRO, VOCs. Monitoring Well MW-11 primary and duplicate samples contained concentrations of benzene (maximum of 307 micrograms per liter [µg/L]), 1,2-dichloroethane (maximum of 59.8 µg/L) and manganese (maximum of 1,680 µg/L) above the ADEC Table C cleanup level of 4.6 µg/L, 1.7 µg/L, and 430 µg/L respectively. Monitoring Well MW-4 contained concentrations and naphthalene (7.02 µg/L) above the ADEC Table C cleanup level of 1.7 µg/L. The remaining tested analytes were either not detected or were detected at concentrations less than the applicable cleanup levels. Groundwater flow direction is to the north. Alena Voigt

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