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Site Report: Texaco #60 Eastchester (former)

Site Name: Texaco #60 Eastchester (former)
Address: 1035 Gambell St.; , Anchorage, AK 99501
File Number: 2100.26.098
Hazard ID: 23993
Status: Active
Staff: Alena Voigt, 9072697556 alena.voigt@alaska.gov
Latitude: 61.211838
Longitude: -149.870682
Horizontal Datum:NAD83

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

Problems/Comments

Gasoline, diesel, and heating oil tanks removed in 1989. Soil and ground water contamination found. Contamination extended off property. In 1992 a soil vapor extraction and groundwater recovery system was installed. The groundwater recovery system operated until 1998, and the soil vapor extraction system operated until 2001. In 2002 a 550 gallon used oil tank was removed. In 2004 the remaining three gasoline tanks and piping were removed. 50 cubic yards of contaminated excavated soil was used as backfill in the south east corner of the former tank location. Up to 38 mg/kg benzene, 630 mg/kg GRO, and 2,200 mg/kg DRO remain in the bottom and sidewalls of the former tank excavation. They did not take confirmation samples to assess current concentrations for the older releases at the site. In 2005 the two floor hoists were removed. EPA has confirmed that the floor drains go to a class 5 injection well (discharge to the soil underground), which needs to be sampled to determine the level and extent of the contamination. To date the class 5 injection well release investigation sampling has not occurred. In 2012 confirmation soil samples were collected to assess the current soil contamination concentrations at this site in vicinity of monitoring wells MW-2, MW-3, MW-11, the former gasoline and fuel oil USTs, and in the vicinity of soil boring B-17. Additionally, some preliminary assessment was conducted on the oil/water separator and associated piping to help locate where it charged too. The preliminary assessment on the oil/water separator and associated piping was inconclusive because of a blockage in the pipe. Further assessment is needed. The 28 soil samples were analyzed from 11 soil borings at the site contained up to 500 mg/kg GRO, 4,500 mg/kg DRO, 330 mg/kg RRO, 0.65 mg/kg benzene, 5.0 mg/kg arsenic, 30 mg/kg chromium, 7.0 mg/kg lead, and 1.7 mg/kg 2-methylnaphalene. Soil and groundwater contamination remains in the vicinity of the former gasoline UTs, waste oil USTs, fuel oil USTs, and off-property to the west and northwest. They continue to monitor the groundwater both on and off property on a semi-annual basis. Need groundwater monitoring, vapor intrusion assessment for on-property and off-property buildings, confirmation soil sampling, and release investigation and possible corrective action for class 5 injection well for site closure. Need to characterize the extent of the VOC and PAH contamination at this site.

Action Information

Action Date Action Description DEC Staff
9/12/1989 Site Added to Database Former Staff
9/12/1989 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77970 Diesel, gasoline, and heating fuel contaminants. Former Staff
9/12/1989 Underground Storage Tank Site Characterization or Assessment Reviewed a phase 1 site assessment report. Former Staff
9/13/1989 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU Date changed DB conversion Former Staff
9/10/1990 Leaking Underground Storage Tank Corrective Action Underway Need to know what type of treatment of groundwater for TPH diesel contamination at 3,400 ppm, alternative plan if air stripping won't clean to municipal discharge requirements, and increase sampling of emissions of ambient air when no longer diffusing with ambient air. Former Staff
7/22/1991 Update or Other Action Anchorage Sand & Gravel sent in receipts of soil treatment at the Klatt road facility. Soils have been blended with AC-5 for use as black base material. Former Staff
10/30/1992 Release Investigation Reviewed a phase 2 site assessment report. Former Staff
5/10/1993 Document, Report, or Work plan Review - other Consultant installed 7 off-property monitoring wells. Four of them showed benzene contamination over 5 ppb. Benzene contamination ranged between ND and 2100 ppb. Former Staff
10/11/1994 Document, Report, or Work plan Review - other Performed a corrective action report review. Former Staff
11/16/1994 Document, Report, or Work plan Review - other Stockpile thermal treatment approval. 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 additional monitoring wells to define extent of the groundwater contamination. Robert Weimer
9/15/2003 Update or Other Action Approved reduction in groundwater monitoring. Robert Weimer
6/7/2004 Document, Report, or Work plan Review - other Reviewed quarterly groundwater monitoring report. Up to 32 ug/l benzene and 840 ug/l GRO. Contaminant concentrations appear to be declining. Robert Weimer
9/29/2004 Document, Report, or Work plan Review - other Reviewed quarterly groundwater monitoring report. Up to 60 ug/l benzene. Contaminant concentrations appear to be increasing in a couple of the off property monitoring wells. Robert Weimer
12/1/2004 Document, Report, or Work plan Review - other Reviewed quarterly groundwater monitoring report. Up to 37 ug/l benzene and 4.4 mg/l GRO in the groundwater. Contaminant concentrations appear to be increasing in a couple of the off property monitoring wells. Robert Weimer
12/9/2004 Update or Other Action Note from consultant that the service station is to be closed and all of the existing UST systems are to be removed. They plan to also take some confirmation samples to assess current levels for the older releases at the site. Robert Weimer
1/21/2005 Document, Report, or Work plan Review - other Reviewed December 3, 2004 groundwater monitoring event report. Up to 45 ug/l benzene and 4.4 mg/l GRO in the groundwater. Contaminant concentrations appear to be increasing in a couple of the off property monitoring wells. Robert Weimer
4/27/2005 Document, Report, or Work plan Review - other The remaining three gasoline tanks and piping were removed in December 2004. 50 cubic yards of contaminated excavated soil was used as backfill in the south east corner of the former tank location. Up to 38 mg/kg benzene, 630 mg/kg GRO, and 2,200 mg/kg DRO remain in the bottom and sidewalls of the former tank excavation. But they did not take some confirmation samples to assess current concentrations for the older releases at the site. Robert Weimer
5/2/2005 Update or Other Action ADEC letter requesting a release investigation workplan and a corrective action plan for the new contamination found at the site during the December 2004 tank removal. Robert Weimer
5/25/2005 Document, Report, or Work plan Review - other Reviewed the report on the 3/7/05 groundwater monitoring event. Up to 43 ug/l benzene and 4.2 mg/l GRO in the groundwater. Contaminant concentrations appear to be increasing in several of the on and off property monitoring wells. Groundwater flow direction was to the west. Robert Weimer
9/14/2005 Document, Report, or Work plan Review - other Two floor hoists were removed on July 13, 2005. The floor drains were also cleaned and assessed. Up to 87 mg/kg RRO found in excavated soil. All samples met default cleanup levels for BTEX, GRO, DRO, and RRO. Robert Weimer
9/16/2005 Document, Report, or Work plan Review - other Reviewed the report on the 6/17/05 groundwater monitoring event. Up to 54 ug/l benzene and 4.2 mg/l GRO in the groundwater. Contaminant concentrations appear to be increasing in some of the on and off property monitoring wells. Groundwater flow direction was to the west. Robert Weimer
12/8/2005 Document, Report, or Work plan Review - other Reviewed the report on the 9/24/05 groundwater monitoring event. Up to 54 ug/l benzene and 6.5 mg/l GRO in the groundwater. Contaminant concentrations appear to be increasing in some of the on and off property monitoring wells. Groundwater flow direction was to the west. Depth to groundwater is 5 to 18 feet below ground surface. Robert Weimer
1/19/2006 Document, Report, or Work plan Review - other Reviewed the report on the 12/03/05 groundwater monitoring event. Up to 26.1 ug/l benzene and 4.46 mg/l GRO in the groundwater. Contaminant concentrations appear to be increasing in some of the off property monitoring wells. Groundwater flow direction was to the west. Depth to groundwater is 6 to 18 feet below ground surface. Robert Weimer
6/9/2006 Document, Report, or Work plan Review - other Reviewed the report on the 3/24/06 groundwater monitoring event. Up to 31.9 ug/l benzene and 3.68 mg/l GRO in the groundwater. Contaminant concentrations appear to be increasing in four of the eleven monitoring wells sampled. Groundwater flow direction was to the west. Depth to groundwater is 6 to 18 feet below ground surface. Robert Weimer
9/19/2006 Document, Report, or Work plan Review - other Reviewed the report on the 6/20/06 groundwater monitoring event. Up to 16.8 ug/l benzene and 3.68 mg/l GRO in the groundwater. Contaminant levels have decreased in all but one of the six monitoring wells sampled. Groundwater flow direction was to the west. Depth to groundwater is 2 to 18 feet below ground surface. Robert Weimer
10/11/2006 Update or Other Action Discussed site with RP's new consultant (Delta Consultants -Portland). They will be submitting a release investigation workplan soon. SE corner backfill minimum of 3 analytical samples and 10 field screening locations. Robert Weimer
11/6/2006 Update or Other Action Discussed with RP's consultant on their work plan for subsurface investigation. He will provide a revised work plan to include a DRO boring at S-2 and an adjustment in the use of an air knife at certain locations. Robert Weimer
11/13/2006 Update or Other Action Review and approve Work Plan for Subsurface Investigation. The work plan calls for drilling 10 soil borings to investigate contamination identified during the December 2004 tank system removal. Robert Weimer
5/4/2007 Update or Other Action ADEC approves request for no-purge groundwater sampling for this site. Robert Weimer
5/11/2007 Document, Report, or Work plan Review - other Reviewed the report on the 12/14/06 groundwater monitoring event. Up to 43.2 ug/l benzene, 3.75 mg/l GRO, non-detect (<0.5 ug/l) 1,2-Dibromethane(EDB) (.05 ug/l cleanup level), and 1,2-Dichloroethane (1,2-DCA) 0.6 ug/l (5 ug/l cleanup level) in the groundwater. Contaminant concentrations have increased in two of the three monitoring wells sampled. Groundwater flow direction was to the southwest. Depth to groundwater is 7.05 to 18.65 feet below ground surface. QA/QC checklist, chain of custody, and lab sample receipt checklist are missing. Robert Weimer
5/14/2007 Update or Other Action ADEC requests that all future submittals have the required QA/QC checklist. Also requested the missing QA/QC checklist for the 5/2/07 report (including missing chain of custody and lab sample receipt check list) and the 2/19/07 report. Robert Weimer
5/14/2007 Document, Report, or Work plan Review - other Reviewed the report on the 3/28/07 groundwater monitoring event. Up to 50.5 ug/l benzene and 3.75 mg/l GRO in the groundwater. Contaminant concentrations have increased in the three monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 7.85 to 8.20 feet below ground surface. Robert Weimer
5/15/2007 Update or Other Action ADEC letter requesting, until further notice, semi-annual groundwater monitoring of BTEX in monitoring wells (2,6,7,9,11,13,15,16,17) and GRO (2,6,7,9,13,16) and DRO (2,13). The letter also requests EDB and 1,2-DCA sampling of monitoring wells 6 and 13 during the next monitoring event, and a conceptual site model for this site. Robert Weimer
8/8/2007 Update or Other Action Talked with EPA. EPA confirmed that the floor drains go to a class 5 injection well. EPA has requested that Shell Oil determine the exact location that the floor drains discharged to, that the drains be plugged or be rerouted that they no longer discharge to the soil, and that they collect soil samples to assess the class 5 well for contamination. Robert Weimer
4/2/2008 Update or Other Action Talked with Jennifer Parker of EPA to check on status of investigation and sampling class 5 injection well at the site by Shell Oil. Shell has not provided a plan yet. She will follow up with Shell and coordinate with ADEC to be sure that the sampling plan for the assessment of the class 5 injection well also includes the methods required in Alaska. Robert Weimer
4/14/2008 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
8/21/2008 Document, Report, or Work plan Review - other Reviewed the report on the 6/19/07 groundwater monitoring event. Up to 54.9 ug/l benzene and 5.18 mg/l GRO in the groundwater. Contaminant concentrations have increased in three of the seven monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 6.67 to 14.04 feet below ground surface. 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 the report on the 9/26/07 groundwater monitoring event. Up to 45.1 ug/l benzene and 2.68 mg/l GRO in the groundwater. Contaminant concentrations have increased in three of the nine monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 6.18 to 14.46 feet below ground surface. Robert Weimer
8/29/2008 Document, Report, or Work plan Review - other Reviewed the report on the 12/11/07 groundwater monitoring event. Up to 45.3 ug/l benzene and 2.68 mg/l GRO in the groundwater. Contaminant concentrations have increased in five of the seven monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 6.18 to 14.65 feet below ground surface. Robert Weimer
9/5/2008 Document, Report, or Work plan Review - other Reviewed the report on the 3/27/08 groundwater monitoring event. Up to 24.2 ug/l benzene and 2.2 mg/l GRO in the groundwater. Contaminant concentrations increased in one of the six monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 7.81 to 14.90 feet below ground surface. Robert Weimer
11/17/2008 Document, Report, or Work plan Review - other Reviewed the report on the 6/10/08 groundwater monitoring event. Up to 48 ug/l benzene and 1.8 mg/l GRO in the groundwater. Contaminant concentrations increased in four of the five monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 7.10 to 14.50 feet below ground surface. Robert Weimer
1/5/2009 Document, Report, or Work plan Review - other Reviewed the report on the 9/17/08 groundwater monitoring event. Up to 31 ug/l benzene, non-detect(<5 ug/l) MTBE, and 2.8 mg/l GRO in the groundwater. Contaminant concentrations increased in three of the eight monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 6.75 to 14.30 feet below ground surface. Robert Weimer
5/1/2009 Document, Report, or Work plan Review - other Reviewed the report on the 12/4/08 groundwater monitoring event. Up to 26 ug/l benzene in the groundwater. Contaminant concentrations increased in two of the three monitoring wells sampled. Several monitoring wells could not be accessed during this monitoring event. Groundwater flow direction was to the west by northwest. Depth to groundwater is 6.52 to 9.25 feet below ground surface. Robert Weimer
6/29/2009 Update or Other Action Jennifer Parker of EPA called to give status of investigation and sampling class 5 injection well at the site by Shell Oil. Shell has not provided a plan yet. She will follow up with Shell and coordinate with ADEC to be sure that the sampling plan for the assessment of the class 5 injection well also includes the methods required in Alaska. Robert Weimer
7/20/2009 Document, Report, or Work plan Review - other Reviewed the report on the 3/25/09 groundwater monitoring event. Up to 27 ug/l benzene, non-detect(<1 ug/l) MTBE, 2.0 mg/l DRO, 1.3 mg/l RRO, and 1.0 mg/l GRO in the groundwater. Contaminant concentrations increased in four of the six monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 7.56 to 14.87 feet below ground surface. Three monitoring wells (MW-9, MW-13, MW-15) were not accessible to sample during this monitoring event. Robert Weimer
7/22/2009 Update or Other Action ADEC recommends that the semi-annual groundwater monitoring events be conducted in the late spring and late fall so snow and ice would not impact the ability to collect water samples. ADEC requests the following semi-annual groundwater monitoring for this site: BTEX and GRO in monitoring wells (2,6,7,9,11,13,15, and 16), DRO and RRO in monitoring wells (2,6,13 and 16), and EDB and 1,2-DCA in monitoring wells (6 and 13). Robert Weimer
1/6/2010 Document, Report, or Work plan Review - other Reviewed the report on the 9/14/09 groundwater monitoring event. Up to 27 ug/l benzene, non-detect (<1 ug/l) EDC, non-detect(<0.01 ug/l) EDB, 1.6 mg/l DRO, non-detect (<0.2 mg/l) RRO, and 3.8 mg/l GRO in the groundwater. Contaminant concentrations increased in four of the nine monitoring wells sampled. Groundwater flow direction was to the west by northwest. Depth to groundwater is 6.63 to 14.75 feet below ground surface. Need continued semi-annual groundwater monitoring. Robert Weimer
5/10/2011 Document, Report, or Work plan Review - other Reviewed the report on the 5/13/10 groundwater monitoring event. Up to 44 ug/l benzene, 9.2 mg/l DRO, 9.1 mg/l RRO, and 3.2 mg/l GRO in the groundwater. Contaminant concentrations increased in 6 of the 8 monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 6.40 to 14.60 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. Robert Weimer
8/30/2011 Document, Report, or Work plan Review - other Reviewed the report on the 9/25/10 groundwater monitoring event. Up to 37 ug/l benzene, 3.6 mg/l DRO, 1.1 mg/l RRO, 0.99 mg/l GRO, and non-detect DCA and EDB in the groundwater. Contaminant concentrations increased in 5 of the 8 monitoring wells sampled. Groundwater flow direction was to the northeast. Depth to groundwater is 7.00 to 14.68 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. Robert Weimer
2/2/2012 Document, Report, or Work plan Review - other Reviewed the report on the 4/13/11 groundwater monitoring event. Up to 20.4 ug/l benzene, 3.44 mg/l DRO, 4.26 mg/l RRO, 0.469 mg/l GRO, and non-detect DCA, EDB, and MTBE in the groundwater. Contaminant concentrations increased in 3 of the 6 monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 7.40 to 15.22 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. Robert Weimer
8/13/2012 Document, Report, or Work plan Review - other Reviewed the report on the 10/11/11 groundwater monitoring event. Up to 17.1 ug/l benzene, 7.43 mg/l DRO, 3.06 mg/l RRO, 1.07 mg/l GRO, and non-detect DCA and EDB in the groundwater. Contaminant concentrations increased in 5 of the 7 monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 7 to 15 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. Report approved. Robert Weimer
9/24/2012 Site Characterization Workplan Approved ADEC approves the September 13, 2012 release investigation work plan for collecting confirmation soil samples to assess the current soil contamination concentrations at this site with the following modifications: 1. During this sampling event or a future one we will need to add borings at TXG-9, RW-13, MW-6, and MW-16. 2. There needs to be a qualified person in the field. 3. All soil samples are to be analyzed for BTEX, GRO, DRO, and RRO, with PAH at the most likely contaminated depth in borings C, F, and G. 4. All borings to extend at least 2 feet below the soil/water interface. 5. The soil/water interface needs to be sampled in each soil boring. This sample may be substituted for one of the sample depths listed in the table in Section 3.1 within two feet of the soil/water interface depth. 6. In any boring if a sample depth appears more contaminated by field reading/observations than the depth specified in the table in Section 3.1 then that interval will need to have an analytical sample collected at that depth. This sample may be substituted for one of the sample depths within two feet of the depth listed in the table in Section 3.1. Robert Weimer
10/30/2012 Offsite Soil or Groundwater Disposal Approved ADEC approves request for transport and disposal of 2 drums of contaminated drill cuttings. Robert Weimer
2/13/2013 Offsite Soil or Groundwater Disposal Approved ADEC approves request for transport and disposal of 2 drums of contaminated drill cuttings. 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
3/26/2013 Document, Report, or Work plan Review - other Reviewed the report on the 4/26/12 groundwater monitoring event. Up to 14.0 ug/l benzene, 5.73 mg/l DRO, 6.34 mg/l RRO, and 2.61 mg/l GRO in the groundwater. Contaminant concentrations increased in 3 of the 7 monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 6 to 15 feet below ground surface. Samples were collected with no-purge and Hydrasleeves. The consultant recommends continued semi-annual groundwater monitoring. Robert Weimer
5/30/2013 Document, Report, or Work plan Review - other Reviewed the report on the 10/26/12 groundwater monitoring event. Up to 3.81 ug/l benzene, 7.06 mg/l DRO, 4.07 mg/l RRO, and 2.61 mg/l GRO in the groundwater. Contaminant concentrations increased in 4 of the 6 monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 6 to 14 feet below ground surface. Samples were collected with no-purge and Hydrasleeves. The consultant recommends continued semi-annual groundwater monitoring. Groundwater volatile samples were collected with Hydrasleeves without purging. Sampling interval information was not provided, results may be biased low if correct interval was not sampled. Robert Weimer
6/28/2013 Site Visit Site visit to observe current site conditions. Robert Weimer
11/27/2013 Site Characterization Report Approved Between September 29, 2012 to October 1, 2012 confirmation soil samples were collected to assess the current soil contamination concentrations at this site in vicinity of monitoring wells MW-2, MW-3, MW-11, the former gasoline and fuel oil USTs, and in the vicinity of soil boring B-17. Additionally, some preliminary assessment was conducted on the oil/water separator and associated piping to help locate where it charged too. The preliminary assessment on the oil/water separator and associated piping was inconclusive because of a blockage in the pipe. Further assessment is needed. The 28 soil samples were analyzed from 11 soil borings at the site contained up to 500 mg/kg GRO, 4,500 mg/kg DRO, 330 mg/kg RRO, 0.65 mg/kg benzene, 5.0 mg/kg arsenic, 30 mg/kg chromium, 7.0 mg/kg lead, and 1.7 mg/kg 2-methylnaphalene. Soil and groundwater contamination remains in the vicinity of the former gasoline UTs, waste oil USTs, fuel oil USTs, and off-property to the west and northwest. Robert Weimer
12/4/2013 Document, Report, or Work plan Review - other Reviewed the report on the 4/2/13 groundwater monitoring event. Up to 2.93 ug/l benzene, 4.69 mg/l DRO, non-detect (<1.9 mg/l) RRO, and 2.54 mg/l GRO in the groundwater. Contaminant concentrations increased in 4 of the 5 monitoring wells sampled. Groundwater flow direction was to the west by northwest. Depth to groundwater is 6 to 9 feet below ground surface. Samples were collected with no-purge and Hydrasleeves. The consultant recommends continued semi-annual groundwater monitoring. Groundwater volatile samples were collected with Hydrasleeves without purging. Sampling interval information was not provided, results are considered biased low because sample interval was not documented. Robert Weimer
5/29/2014 Document, Report, or Work plan Review - other Reviewed the report on the October 14-17, 2013 groundwater monitoring event. Up to 16.7 ug/l benzene, 11.6 mg/l DRO, non-detect (<2.11 mg/l) RRO, 0.0988 ug/l EDB, non-detect (<1.0 ug/l) 1,2-DCA and 2.7 mg/l GRO in the groundwater. Contaminant concentrations increased in 4 of the 7 monitoring wells sampled. Groundwater flow direction was to the west. Depth to groundwater is 5.55 to 13.5 feet below ground surface. Samples were collected with no-purge with Hydrasleeves and purge with a bladder pump. Sampling interval information for both purge and no-purge was not documented in the report or field notes, results are considered biased low because sample interval was not documented. While the purge and no purge concentrations were similar, can't compare because they may have been collected at different intervals. Robert Weimer
10/20/2014 Offsite Soil or Groundwater Disposal Approved ADEC approves request to treat 3 drums of contaminated purge water. Robert Weimer
1/29/2015 Document, Report, or Work plan Review - other Reviewed the report on the March 26-27, 2014 groundwater monitoring event. Up to 13.9 ug/l benzene, 3.78 mg/l DRO, non-detect (<1.0 mg/l) RRO, 0.0133 ug/l EDB, non-detect (<1.0 ug/l) 1,2-DCA, 5.67 ug/l lead and 3.26 mg/l GRO in the groundwater. Contaminant concentrations increased in 7 of the 9 monitoring wells sampled. Groundwater flow direction was to the west. Depth to groundwater is 6.09 to 13.80 feet below ground surface. Samples were collected with no-purge with Hydrasleeves and purge with a bladder pump. Sampling was conducted by purge method (bladder pump) where the intake was within the top foot of the water column. Robert Weimer
6/30/2015 Document, Report, or Work plan Review - other Reviewed the report on the October 14-16, 2014 groundwater monitoring event. Up to 14.1 ug/l benzene, 7.39 mg/l DRO, 1.16 mg/l RRO, non-detect (<1.0 ug/l) EDB, non-detect (<1.0 ug/l) 1,2-DCA, 2.66 ug/l lead and 3.46 mg/l GRO in the groundwater. Contaminant concentrations increased in 6 of the 8 monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 6.18 to 13.63 feet below ground surface. Samples were collected with no-purge with Hydrasleeves and purge with a bladder pump. Sampling was conducted by purge method (bladder pump) where the intake was near the soil/water interface as required. Robert Weimer
1/27/2016 Document, Report, or Work plan Review - other April 14-16, 2015 groundwater monitoring event. Up to 8.3 ug/l benzene, 3.82 mg/l DRO, 0.885 mg/l RRO, 2.96 mg/l GRO, and non-detect EDB, 1,2-DCA, and lead in the groundwater monitoring well sampled. Contaminant concentrations increased in 3 of the 8 monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 7.07 to 14.49 feet below ground surface. Samples were collected after purging using a bladder pump with the pump intake near the soil/water interface as required. Monitoring well MW-17 was not sampled because it was filled with ice and monitoring well MW-15 was not located because it appears to have been paved over. 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. DEC to complete the review of the submitted assessment work plan. DEC will be requesting that the vapor intrusion (VI) portion be in a separate work plan that includes the building survey construction information and per the DEC VI Guidance will need 3+ locations per building. The class 5 injection well area will also need to be assessed and based on the results additional corrective action may be required. We discussed that additional monitoring wells will be required to the west of MW-9. DEC requested rose diagrams showing historical groundwater flow directions be included in future site monitoring report maps. Robert Weimer
6/9/2016 Document, Report, or Work plan Review - other October 22, 2015 groundwater monitoring event. Up to 12.7 ug/l benzene, 3.21 mg/l DRO, 0.831 mg/l RRO, 1.31 mg/l GRO, 2.2 ug/l lead, and non-detect EDB and 1,2-DCA in the groundwater monitoring well sampled. Contaminant concentrations increased in 3 of the 9 monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 5.68 to 14.05 feet below ground surface. Samples were collected after purging using a submersible pump with the pump intake near the soil/water interface as required. Monitoring well MW-17 was not sampled because it was dry. 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. DEC to complete the review of the submitted assessment work plan. DEC will review the VI portion of the work plan to look at the number of vapor points for which buildings. The class 5 injection well area will also need to be assessed and based on the results additional corrective action may be required. Previously we discussed that additional monitoring wells will be required to the west of MW-9. 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. Robert Weimer
8/3/2016 Site Visit Site visit to observe current site conditions and to note if the downgradient buildings have a basement. It appears that the Michael Building has a full basement and the apartment buildings have a half basement. Robert Weimer
8/3/2016 Update or Other Action ADEC requests that during the next groundwater monitoring event that the monitoring wells to be sampled be analyzed by method 8260 to evaluate for solvents in the groundwater, possibly from the class 5 injection well that has not been characterized. Will evaluate the results of this and the PAH sampling to see if vapor intrusion sampling will be needed for the on-property building or nearby buildings. Historically the depth to groundwater is 7.3 feet below ground surface (bgs) near the 1040 Gambell Building, and 6.0 feet bgs near the apartment buildings and near the Michael Building. Robert Weimer
10/31/2016 Document, Report, or Work plan Review - other April 4-5, 2016 groundwater monitoring event. Up to 9.2 ug/l benzene, 3.47 mg/l DRO, 0.579 mg/l RRO, 1.08 mg/l GRO, 1.5 ug/l lead, and non-detect EDB, MTBE, and 1,2-DCA in the groundwater monitoring well sampled. Contaminant concentrations increased in 7 of the 9 monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 6.35 to 14.70 feet below ground surface. Samples were collected after purging using a bladder pump with the pump intake near the soil/water interface as required. Monitoring well MW-17 was not sampled because it was dry. Because the samples were received over temperature at 8.2 to 13.6 degrees C at the lab 2 to 3 days after sampling they are considered biased low. 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. Robert Weimer
4/20/2017 Document, Report, or Work plan Review - other October 2-3, 2016 groundwater monitoring event. Up to 13.1 ug/l benzene, 7.19 mg/l DRO, 0.603 mg/l RRO, 1.25 mg/l GRO, 78 ug/l naphthalene, 50.8 ug/l 1-methylnaphthalene, 47.1 ug/l 2-methylnaphthalene, and non-detect lead, EDB, MTBE, and 1,2-DCA in the groundwater monitoring well sampled. Contaminant concentrations increased in 6 of the 8 monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 7.33 to 14.68 feet below ground surface. Samples were collected after purging using a bladder pump with the pump intake near the soil/water interface as required. Robert Weimer
4/26/2017 Update or Other Action DEC approves request for reduction to semi-annual sampling of monitoring wells 2,3,6,7,9,13,16 and annual sampling (4th quarter) in monitoring wells 10,11,15,17 for full 8260, GRO, and DRO. Monitoring wells 6,9,16 also sampled for PAH. Robert Weimer
8/2/2017 Document, Report, or Work plan Review - other April 21-22, 2017 groundwater monitoring event. Up to 12.1 ug/l benzene, 4.2 mg/l DRO, 1.61 mg/l RRO, 0.517 mg/l GRO, 8.82 ug/l naphthalene, 12.0 ug/l 1-methylnaphthalene, 2.43 ug/l 2-methylnaphthalene, 3.42 ug/l MTBE, and non-detect EDB and 1,2-DCA in the groundwater monitoring well sampled. The full 8260 VOC analysis was not conducted as required, only a partial list was analyzed. Contaminant concentrations increased in 6 of the 6 monitoring wells sampled. Three monitoring wells were not sampled: MW-10 was blocked with ice, RW-13 had a car parked over it, and MW-17 had a rope stuck in it. Groundwater flow direction was to the northwest. Depth to groundwater is 6.47 to 14.95 feet below ground surface. Samples were collected after purging using a bladder pump with the pump intake near the soil/water interface as required. Since the samples were received over temperature (14.1 deg C) the results may be biased low. The samples were received at the lab 4 to 5 days after sampling. Robert Weimer
8/4/2017 Document, Report, or Work plan Review - other ADEC conditionally approves site investigation work plan. The work plan proposes to drill soil borings, install a monitoring well, collect soil and groundwater samples, install soil vapor probes, and collect soil gas samples to help characterize the concentration and extent of the soil, groundwater, and vapor contamination for this site. The work plan is approved with the following modifications: 1. Based on the more recent groundwater sampling results being below commercial screening levels, ADEC is not currently requesting a vapor intrusion assessment for the commercial building located at 1040 Gambell Street. 2. ADEC is requesting a minimum of three soil vapor probes (C, D, and E) be installed on the east and northeast side of the eastern most residential apartment building. If the soil vapor probes can’t be installed next to the building ADEC requests that they be installed just outside of the property line/in the right of way just east and northeast of the apartment building property. ADEC requests that you submit a revised figure for the location of the soil vapor probes for ADEC review and approval prior to installation. ADEC request that the soil samples include analysis for the full VOCs (method 8260) and PAHs. 3. ADEC requests that the soil vapor probe installation and sampling be done in accordance the current ADEC Vapor Intrusion Guidance for Contaminated Sites. 4. ADEC requests that monitoring well A be installed at a location further north so that it is located downgradient of monitoring well MW-9. ADEC request that the soil sample and initial groundwater sampling at this location include analysis for the full VOCs (method 8260). 5. ADEC requests that soil boring B extend to groundwater and that a soil sample be collected at the soil/water interface in addition to the most likely contaminated shallower depth(s). ADEC requests that a duplicate sample set be collected from one of soil sample locations in this boring. If it appears that the soil/water interface is impacted ADEC requests that soil boring B be completed as a long-term monitoring well and the groundwater be sampled initially for the same list of soil analytes. 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 they will conduct VI soil gas sampling for the closest down gradient apartment building, additional down gradient monitoring well, and locate and assess the location of the former floor drain class V injection well. We also discussed problem with the April 2017 groundwater samples arriving at the lab 4 or 5 days after sampling over temperature and that full VOC analysis is needed for groundwater samples. Robert Weimer
12/7/2017 Document, Report, or Work plan Review - other October 4-5, 2017 groundwater monitoring event. Up to 12.1 ug/l benzene, 4.71 mg/l DRO, 1.72 mg/l RRO, 0.961 mg/l GRO, 28.9 ug/l naphthalene, 22.5 ug/l 1-methylnaphthalene, 13.5 ug/l 2-methylnaphthalene, 10.0 ug/l MTBE, and non-detect EDB and 1,2-DCA in the groundwater monitoring well sampled. The full 8260 VOC analysis was not conducted as required, only a partial list was analyzed. Contaminant concentrations increased in 7 of the 10 monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 6.72 to 14.71 feet below ground surface. Samples were collected after purging using a bladder pump with the pump intake near the soil/water interface as required. Since the VOC sample for monitoring well MW-16 was analyzed 6 days out of holding time the results may be biased low. Monitoring well MW-15 was found damaged, they plan to decommission the monitoring well and install a replacement monitoring well further to the west away from surface flooding. 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 they will conduct VI soil gas sampling for the closest down gradient apartment building, additional down gradient monitoring well, and locate and assess the location of the former floor drain class V injection well. Robert Weimer
3/23/2018 Document, Report, or Work plan Review - other DEC reviews and approves GES's Release Investigation Work Plan addendum for the installation and sampling of 3 off-property vapor probes, one additional down gradient monitoring well, and one soil boring to the east of the service station building that may be completed as a monitoring well if contamination is observed during the soil sampling. Soil samples are to be analyzed for GRO, DRO, RRO, full VOCs, and PAHs. 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 they will conduct VI soil gas sampling for the closest down gradient apartment building, additional down gradient monitoring well, and locate and assess the location of the former floor drain class V injection well. Robert Weimer
7/26/2018 Offsite Soil or Groundwater Disposal Approved DEC approved request to treat at NRC 1 drum of contaminated water and dispose of four drums of drill cuttings at Waste Management's Columbia Ridge landfill in Oregon. The water and soil were generated during the April 2018 release investigation work. 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 they will conduct VI soil gas sampling of the vapor probes during non-frozen ground conditions and locate and assess the location of the former floor drain class V injection well in the fall of 2018. Need a minimum of four quarters of groundwater monitoring in the newly installed monitoring well along with the semi-annual groundwater monitoring. 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
11/5/2018 Document, Report, or Work plan Review - other On April 16-17, 2018 one monitoring well was decommissioned (MW-15), one new monitoring well was installed (MW-18), and three soil vapor probes (SV-1, SV-2, and SV-3) were installed. The soil samples collected during the installation of the monitoring well and the soil vapor probes had up to 4.54 mg/kg GRO, 9.38 mg/kg DRO, and 176 mg/kg RRO. The samples were non-detect for BTEX and MTBE. PAHs were non-detect or detected below 2016 cleanup levels. The three soil vapor probes were installed to collect air samples at 5 feet below ground surface (bgs). Monitoring well MW-18 had groundwater at 6.5 feet bgs during drilling and stabilized at 8 feet bgs after the monitoring well was installed. Robert Weimer
2/13/2019 Document, Report, or Work plan Review - other April 24-25, 2018 groundwater monitoring event. Up to 1,280 ug/l benzene, 2.59 mg/l DRO, 1.1 mg/l RRO, 0.554 mg/l GRO, 24.5 ug/l naphthalene, 20.7 ug/l 1-methylnaphthalene, and 11.3 ug/l 2-methylnaphthalene in the groundwater monitoring well sampled. The full 8260 VOC analysis was conducted as required. Contaminant concentrations increased in 1 of the 9 monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 7.09 to 14.86 feet below ground surface. Samples were collected after purging using a bladder pump with the pump intake near the soil/water interface as required. Monitoring well MW-15 was decommission on April 16, 2018. On April 15, 2018 new off-property monitoring well MW-18 was installed to help define the extent of the groundwater contamination. Robert Weimer
2/13/2019 Document, Report, or Work plan Review - other April 25, 2018 soil vapor sampling event. The three soil vapor probes (SV-1, SV-2, and SV-3) were installed to collect air samples at 5 feet below ground surface(bgs). Helium was non-detect in the soil vapor sample collected so the surface seals were tight. Benzene was detected at 29.7 ug/m3 which exceeds 10% of residential (36 ug/m3) target levels. Chloroform was detected at (16.5 and 17.7 ug/m3) which exceeds residential target levels (12 ug/m3). Soil vapor samples also exceeded 10% of residential target levels for ethylbenzene, 1,2,4-trimethylbenzene, and xylenes. Further vapor sampling is required. Robert Weimer
2/15/2019 Document, Report, or Work plan Review - other October 1-3, 2018 groundwater monitoring event. Up to 12 ug/l benzene, 4.82 mg/l DRO, 1.17 mg/l RRO, 0.594 mg/l GRO, 4.91 ug/l toluene, 33.7 ug/l ethylbenzene, 146 ug/l xylenes, 19.3 ug/l naphthalene, 20.6 ug/l 1-methylnaphthalene, and 14.3 ug/l 2-methylnaphthalene in the groundwater monitoring well sampled. The full 8260 VOC analysis was conducted as required. Contaminant concentrations increased in 6 of the 8 monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 7.72 to 14.40 feet below ground surface. Samples were collected after purging using a bladder pump with the pump intake near the soil/water interface as required. Robert Weimer
2/15/2019 Document, Report, or Work plan Review - other October 3, 2018 soil vapor sampling event. The three soil vapor probes (SV-1, SV-2, and SV-3) were installed to collect air samples at 5 feet below ground surface(bgs). Due to moisture in the dedicated tubing for SV-2 and SV-3 no soil vapor sample was collected from them. SV-1 was below residential target levels but exceeded 10% of the residential target levels for ethylbenzene, 1,2,4-Trimethylbenzene, and xylenes so further monitoring is required. Helium was non-detect in the soil vapor sample collected so the surface seals were tight. 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 they will conduct VI soil gas sampling of the vapor probes SV-2 and SV-3 (including oxygen concentrations) during non-frozen ground conditions and locate and assess the location of the former floor drain class V injection well, both in the fall of 2019. They will conduct a summer 2020 sampling event in monitoring well MW-18 in addition the normal semi-annual groundwater monitoring at this site. 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
9/24/2019 Site Visit Site visit to observe current site conditions. Robert Weimer
11/21/2019 Document, Report, or Work plan Review - other January 22, 2019 groundwater monitoring event. Only monitoring well MW-18 was sampled during this event. Up to 0.977 mg/l DRO, 0.646 mg/l RRO, 0.0298 mg/l GRO, and 0.0211 ug/l naphthalene in the water samples collected from this monitoring well. The VOCs and other PAHs were non-detect. Contaminant concentrations increased in 1 monitoring well sampled. Historic groundwater flow direction is to the northwest. Depth to groundwater 8.09 feet below ground surface. Samples were collected after purging using a bladder pump with the pump intake near the soil/water interface as required. Robert Weimer
11/21/2019 Document, Report, or Work plan Review - other April 1-2, 2019 groundwater monitoring event. Up to 14.6 ug/l benzene, 5.09 mg/l DRO, 1.1 mg/l RRO, 0.75 mg/l GRO, 1.57 ug/l toluene, 7.71 ug/l ethylbenzene, 16.4 ug/l xylenes, 1.64 ug/l MTBE, 0.551 ug/l 1,2-DCA, 0.702 ug/l naphthalene, 12.0 ug/l 1-methylnaphthalene, and 4.16 ug/l 2-methylnaphthalene in the groundwater monitoring well sampled. The full 8260 VOC analysis was conducted as required. Contaminant concentrations increased in 8 of the 9 monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 7.72 to 15.24 feet below ground surface. Samples were collected after purging using a bladder pump with the pump intake near the soil/water interface as required. Robert Weimer
11/21/2019 Document, Report, or Work plan Review - other March 29, 2019 soil vapor sampling event. The three soil vapor probes (SV-1, SV-2, and SV-3) were installed to collect air samples at 5 feet below ground surface(bgs). They exceeded 10% of the residential target levels for Ethylbenzene, Xylenes, and 1,2,4-Trimethylbenzene. Naphthalene (10.8 ug/m3) exceeded residential target levels (8.3 ug/m3). Helium was non-detect in the soil vapor sample collected so the surface seals were tight. Further vapor sampling is required. Robert Weimer
12/10/2019 Update or Other Action ADEC requests that the soil vapor analytical data tables include any detectable compounds for each monitoring event and compare to residential target levels reported in ug/m3. The report narrative needs to discuss any compounds that exceed residential target levels and any within 10% of residential target levels. Because of past exceedances and results within 10% of residential target levels ADEC requests until further notice continued monitoring of all three soil vapor probes, including oxygen concentrations, during both frozen and non-frozen ground conditions. Robert Weimer
3/16/2020 Document, Report, or Work plan Review - other GES submitted a groundwater monitoring and soil vapor report on March 16, 2020. It was dated February 25, 2020. Randy Guintu
8/18/2020 Document, Report, or Work plan Review - other The CSP sent Shell a comment letter to the groundwater monitoring and soil vapor sampling report dated February 25, 2020. Randy Guintu
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
2/11/2021 Site Characterization Report Approved The CSP approved two reports, Class V Well Investigation Report Revised and Semi-Annual 2019 Groundwater Monitoring and Soil Vapor Report both dated December 29, 2020. They were approved via electronic letter on February 11, 2021. Randy Guintu
4/18/2023 Site Characterization Report Approved The Alaska Department of Environmental Conservation’s (ADEC) Contaminated Sites Program (CSP) reviewed the “First Semiannual 202 Groundwater Monitoring Report”, dated August 19, 2022, and received on September 7, 2022, from Groundwater & Environmental Services, Inc. (GES). Fourteen groundwater monitoring wells were sampled and analyzed for gasoline range organics (GRO) via AK 101, diesel range organics (DRO) via AK 102, residual range organics (RRO) via AK 103, volatile organic compounds (VOCs) via EPA 8260D, and polycyclic aromatic hydrocarbons (PAHs) via 8270D-SIM. Monitoring Wells MW-4, MW-6, MW-9, MW-11, and MW-16 contained DRO concentrations (maximum of 3,380 micrograms per liter [µg/L]) above the ADEC cleanup level of 1,500 µg/L. Monitoring Well MW-6 had concentrations of benzene at 10.9 µg/L, above the ADEC cleanup level of 4.6 µg/L. Monitoring Well MW-9 had concentrations of 1-methylnaphthalene and naphthalene at concentrations above the ADEC cleanup levels, at 16.6 µg/L, and 14.5 µg/L, respectively. The remaining tested analytes were either not detected or were detected at concentrations less than the applicable cleanup levels. The primary groundwater flow direction was to the northwest west at an approximate hydraulic gradient of 0.005 foot/foot. Due to the recent MW-1 access, a secondary gradient was observed with a groundwater flow direction to the southeast at an approximate hydraulic gradient of 0.03 feet/foot. Alena Voigt
4/19/2023 Site Characterization Report Approved ADEC Reviewed the 2022 Second Semiannual Groundwater report. The report details the results from the October 24-26, 2022 groundwater sampling event. Fourteen groundwater monitoring wells were sampled and analyzed for gasoline range organics (GRO) via Alaska Method (AK) 101, diesel range organics (DRO) via AK 102, residual range organics (RRO) via AK 103, volatile organic compounds (VOCs) via EPA 8260D, and polycyclic aromatic hydrocarbons (PAHs) via 8270D-SIM. Monitoring Well MW-6 contained concentrations of benzene (8.95 micrograms per liter [µg/L]), and ethylbenzene (40.1 µg/L), greater than their respective ADEC Table C cleanup levels of 4.6 µg/L, and 15 µg/L. Naphthene was also detected in Monitoring Wells MW-6 (4.88 µg/L) and MW-9 (2.88 µg/L) greater than the ADEC Table C cleanup levels of 1.7 µg/L. The remaining tested analytes were either not detected or were detected at concentrations less than the applicable cleanup levels. The next round of semiannual groundwater sampling events is scheduled to be in 2023. Alena Voigt
9/13/2023 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 July 14, 2023 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
10/26/2023 Site Characterization Report Approved The ADEC CSP received and reviewed revised “First Semiannual 2023 Groundwater Monitoring Report" report on September 28, 2023. Fourteen groundwater monitoring wells were sampled and analyzed for GRO, DRO, RRO, VOCs, and PAHs. Monitoring Wells MW-2, MW-6, MW-9, MW-11, RW- 13, and MW-16 contained DRO concentrations (maximum of 6,250 micrograms per liter [µg/L]) above the ADEC cleanup level of 1,500 µg/L. Monitoring Wells MW-2, MW-6, MW-11, and RW-13 contained concentrations of RRO (maximum of 1,690 µg/L) above the ADEC cleanup level of 1,100 µg/L. Monitoring Well MW-6 contained concentrations of benzene at 11.3 µg/L, above the ADEC cleanup level of 4.6 µg/L. Monitoring Well MW-9 had concentrations of naphthalene of 1.73 µg/L, above the ADEC 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. The next sampling event is scheduled for October 2023. Alena Voigt

Contaminant Information

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Hazard ID Site Name File Number
26240 Fairview Areawide Brownfield Assessment 2100.57.020

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