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Site Report: Texaco Service Station 63-057-0024 (Shell)

Site Name: Texaco Service Station 63-057-0024 (Shell)
Address: 3304 Spenard Rd, Anchorage, AK 99501
File Number: 2100.26.102
Hazard ID: 24200
Status: Active
Staff: Alena Voigt, 9072697556 alena.voigt@alaska.gov
Latitude: 61.189662
Longitude: -149.908437
Horizontal Datum:WGS84

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 and diesel contamination found during facility upgrade in 1996, it identified a fuel release from some of the piping. During the facility upgrade in 1996 forty cubic yards of contaminated soil was excavated transported and disposed of off-site at the fire access road at the Port of Anchorage without ADEC approval. In 1997 soil and a groundwater samples were collected from a soil boring that was drilled near the area where contamination was identified in 1996. In 2001 another soil boring and a long-term monitoring well was installed. In 2006 three soil borings were sampled, and groundwater samples were collected. On December 2008 five fiberglass underground storage tanks (12,000 gallon gasoline, 10,000 gallon gasoline, 10,000 gallon gasoline, 8,000 gallon diesel, and 550 gallon used oil), their piping and two haudraulic hoists were removed. Groundwater was observed at 13 feet below ground surface. 100 cubic yards of soil were removed and sampled. Some contaminated soil was encountered at the used oil tank, this contamination was removed, and that excavated soil was thermally treated. In the gasoline/diesel tank excavation soil contamination extended to groundwater which is located at 13 feet below ground surface. In July and August 2011 additional site investigation work was conducted. They collected soil samples from 8 soil borings, and completed 5 of them as monitoring wells and collected groundwater samples. Up to 13.9 mg/kg GRO, 5,500 mg/kg DRO, 20,800 mg/kg RRO, and 0.00293 mg/kg benzene in the soil. Higher concentrations may exist because samples were not analyzed from higher field reading soils in SB-6 (10-15 feet bgs) and MW-7 (15 to 20 feet bgs). Contamination over site cleanup levels remains in the area of the former hoists. During the March 2012 groundwater monitoring event 1.18 feet of product was found in monitoring well MW-7 and 0.01 feet of product was found in monitoring well MW-2. Product recovery efforts in monitoring well MW-7 were contacted between 2011 and 2019. Product drawdown and recovery rate monitoring was conducted in 2018 and 2019.

Action Information

Action Date Action Description DEC Staff
6/1/1996 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77691 (Added by System) David Allen
6/1/1996 Leaking Underground Storage Tank Cleanup Initiated - Petroleum Former Staff
6/1/1996 Underground Storage Tank Site Characterization or Assessment In 1996 during facility upgrade of the product piping and dispensers contaminated soil was found. 40 cubic yards of contaminated soil was excavated. This soil was transported to and disposed of at the Texaco facility fire access road in the Port of Anchorage without ADEC approval. Contaminated soil remains in the excavation at the gas station. The extent of the remaining contamination needs to be defined. Stained soil with a strong odor was left in the excavation with 0.415 mg/kg benzene, 59.8 mg/kg GRO, and 218 mg/kg DRO. Robert Weimer
6/1/1996 Site Added to Database Former Staff
7/30/1997 Update or Other Action ADEC letter requesting release investigation and corrective action plan for the remaining contamination at the site. The letter also notes that it was a violation of 18 AAC 78.320 to transport and dispose of the 40 cubic yard contaminated soil stockpile without ADEC approval. Robert Weimer
8/4/1997 Document, Report, or Work plan Review - other On August 4, 1997 a soil boring/monitoring well was installed near piping release area. Up to 0.00977 mg/l benzene (0.005 mg/l cleanup level) and 1.17 mg/l DRO (1.5 mg/l cleanup level) in the groundwater. There was not a soil sample collected at the soil water interface as required. Elevated field readings in the soil extended from 3.5 to 16 feet below ground surface. Groundwater was encountered at 13.3 feet below ground surface. Robert Weimer
12/3/1997 Update or Other Action ADEC letter requesting groundwater investigation, corrective action plan, and stockpile documentation. Robert Weimer
12/20/1999 Update or Other Action ADEC letter requesting groundwater investigation and site information. Robert Weimer
1/3/2000 Site Characterization Report Approved Texaco (Shell) had their consultant collect samples to assess for any remaining contamination at the Texaco fire access road at the Port of Anchorage where they disposed contaminated soil without ADEC approval. All samples met default cleanup levels. Robert Weimer
10/17/2000 Site Characterization Workplan Approved ADEC approves workplan to install a monitoring well near the release point and to collect soil and groundwater samples. Robert Weimer
4/6/2001 Site Characterization Report Approved On February 2, 2001 a soil boring/monitoring well was installed near piping release area. Contamination found at the area (13 feet below ground surface, at the soil water interface) up to 0.421 mg/kg benzene in the soil (0.025 mg/kg is the cleanup level),and 0.51 mg/l benzene in the groundwater (0.005 mg/l cleanup level). Robert Weimer
6/28/2001 Cleanup Plan Approved DEC approved 2 drums of contaminated soil drill cuttings to be thermally treated at ASR. Robert Weimer
12/2/2005 Update or Other Action File review: Contaminated soil remains near the active UST system at this gas station site. This contamination extends to groundwater located at 13 feet below ground surface. Robert Weimer
3/23/2006 Site Characterization Report Approved On March 3, 2006 three soil borings were sampled, and three groundwater samples were collected (two from borings and one from monitoring well MW-1) as part of a Phase II assessment. Up to 0.0195 mg/kg benzene, non-detect (<4.17 mg/kg) GRO, and 6.49 mg/kg DRO in the soil samples collected. Up to 0.615 ug/l benzene, non-detect (<0.05 mg/l) GRO, and 0.244 mg/l DRO in the groundwater samples collected. Groundwater was encountered at 13 feet below ground surface. Robert Weimer
3/7/2007 Exposure Tracking Model Ranking Site ranked on the new Exposure Tracking Model (ETM). The ETM is a new site ranking system that looks at, based on available data, the potential exposure pathways for the contamination remaining at the site. Robert Weimer
4/2/2007 Meeting or Teleconference Held Meeting with Texaco/Shell to discuss sites. They will sample monitoring well on an annual basis for DRO, GRO, and BTEX. Robert Weimer
10/2/2008 Meeting or Teleconference Held Talked with Shell's consultant (DELTA). They plan to sample the groundwater this year. Robert Weimer
12/10/2008 Site Visit Site vist to observe the removal of the remaining tanks and piping at the site. Some contamination observed at the used oil tank. Discussed closure sampling with Shell's consultant (Delta). Robert Weimer
5/21/2009 Site Characterization Report Approved On December 2008 five fiberglass underground storage tanks (12,000 gallon gasoline, 10,000 gallon gasoline, 10,000 gallon gasoline, 8,000 gallon diesel, and 550 gallon used oil), their piping, and two haudraulic hoists were removed. Groundwater was observed at 13 feet below ground surface. 100 cubic yards of soil were removed and sampled. Some contaminated soil was encountered at the used oil tank, it was removed, and that excavated soil was thermally treated. Up to 0.31 mg/kg benzene (at T2-T3), 62 mg/kg GRO, 500 mg/kg DRO (at hoist #2), Non-detect for PAH's, metals samples met background levels, and 2100 mg/kg RRO (at hoist #2). All of the benzene samples had elevated detection limits that exceeded cleanup levels (0.025 mg/kg). The consultant recommends locating monitoring well MW-1 in the spring of 2009 and having it sampled. Robert Weimer
11/25/2009 Site Characterization Report Approved June 12, 2009 groundwater sampling of monitoring well MW-1. It was non-detect for arsenic, chromium, lead, GRO, benzene, DRO, and RRO in the groundwater. Depth to groundwater was 11.13 feet below ground surface. Need continued quarterly groundwater monitoring of existing and future groundwater monitoring wells to document trends in contamination concentrations. Robert Weimer
5/13/2010 Update or Other Action Requested field notes for the December 2008 field work. Shell's consultant (Delta) said they should be submitted by 5/17/10. Robert Weimer
8/31/2010 Update or Other Action DEC letter to Shell requesting a release investigation workplan be submitted by October 15, 2010 to help define the extent of the remaining soil and groundwater contamination, including the installation of additional monitoring wells at the site. Contamination was identified during the removal of the underground storage tank systems and hydraulic hoists at the site in December 2009. Soil samples collected in the base of former gasoline and diesel tank excavation identified benzene soil contamination up to 0.31 mg/kg at 14 feet below ground surface (bgs). Groundwater was encountered at 13 feet bgs during the tank removal. Benzene contamination over cleanup levels may exist at other locations at the site since all of the laboratory samples collected had reporting limits (0.047 to 0.067 mg/kg) above site cleanup levels of 0.025 mg/kg. Shell's consultant will be requesting revised laboratory data sheets from the lab that show the method detection limits (MDL) for those samples. In addition one of the hydraulic hoist samples exceeded site cleanup levels for DRO at 500 mg/kg at 8 feet bgs. Robert Weimer
11/30/2010 Update or Other Action Due to change in consultants DEC approves extention request to submit release investigation workplan to December 10, 2010. Robert Weimer
12/10/2010 Meeting or Teleconference Held Received call from Shell's new consultant (CRA) that they expect to submit the workplan by December 14, 2010. Robert Weimer
12/21/2010 Update or Other Action DEC receives by email a release investigation workplan from Shell's consultant. As requested copies were provided to the property owners representative and the prospective purchasers representative. Robert Weimer
1/11/2011 Document, Report, or Work plan Review - other Reviewed revised laboratory data showing method detection limits for the December 2008 UST closure sampling. The revised data reports better detection limits for benzene. With the better detection limits 4 additional locations (hoist 1-8: 0.042 mg/kg, south wall 1-10: 0.026 mg/kg, west wall 1-10: 0.031 mg/kg, and west wall 2-10: 0.034 mg/kg) have benzene over cleanup levels. Robert Weimer
1/11/2011 Meeting or Teleconference Held Meeting with prospective purchaser and her agent to discuss current site conditions and future site work. They requested that DEC contact Shell to help facilitate getting an indemnification agreement needed for the purchase of the property. Robert Weimer
1/19/2011 Meeting or Teleconference Held Talked with Shell to help facilitate an indemnification agreement needed for the purchase of the property. Shell will contact the agent for the prospective purchaser about providing an indemnification agreement. Robert Weimer
1/20/2011 Meeting or Teleconference Held ADEC provided comments on proposed release investigation workplan to Shell's consultant (CRA). They are to provide a revised workplan to include additional assessment areas and to complete the proposed monitoring wells as long-term monitoring wells. Robert Weimer
5/18/2011 Site Characterization Workplan Approved ADEC conditionally approves revised release investigation workplan. The plan proposes to install collect soil samples from 8 soil borings and complete 3 to 6 of them as monitoring wells and collect groundwater samples. The condition of the approval is that borings E and F be completed as monitoring wells. They are located to the south and west of the former tank excavation. Robert Weimer
10/19/2011 Offsite Soil or Groundwater Disposal Approved DEC approves request to dispose of 5 drums and 2 super sacks of contaminated drill cuttings and 1 drum of contaminated decontamination water at a permitted landfill in Washington state. This material was generated during recent site investigation work. Robert Weimer
11/21/2011 Offsite Soil or Groundwater Disposal Approved DEC approves request to dispose of drums of contaminated purge water at a permitted landfill in Washington state. This material was generated during a recent groundwater monitoring event. Robert Weimer
9/4/2012 Document, Report, or Work plan Review - other October 6, 2011 groundwater sampling of the 7 site monitoring wells. Up to 118 ug/l GRO (2,200 ug/l cleanup level), 1.96 ug/l benzene (5 ug/l cleanup level), 1,480 ug/l DRO (1,500 ug/l cleanup level), and 7,120 ug/l RRO (1,100 ug/l cleanup level) in the groundwater. The highest concentrations were in the monitoring well near the former hoists.Depth to groundwater was 9.83 to 12.18 feet below ground surface. Groundwater flow direction was to the southeast. The consultant recommends continued quarterly groundwater monitoring to document trends in contamination concentrations. Robert Weimer
10/9/2012 Document, Report, or Work plan Review - other Site investigation work in July and August 2011. They collected soil samples from 8 soil borings and completed 5 of them as monitoring wells and collected groundwater samples. Up to 13.9 mg/kg GRO, 5,500 mg/kg DRO, 20,800 mg/kg RRO, and 0.00293 mg/kg benzene in the soil. Higher concentrations may exist because samples were not analyzed from higher field reading soils in SB-6 (10-15 feet bgs) and MW-7 (15 to 20 feet bgs). Contamination over site cleanup levels remains in the area of the former hoists. The extent of that soil and groundwater contamination has not been defined. The consultant recommends continued quarterly groundwater monitoring. NAPL hydraulic oil product was found on the groundwater in monitoring well MW-7. 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 and 1 drum of hydraulic oil collected from the groundwater in monitoring well MW-7. Robert Weimer
1/24/2013 Document, Report, or Work plan Review - other March 27-28, 2012 groundwater sampling of 4 of the 6 site monitoring wells (monitoring wells MW-2 and MW-7 were not sampled due to product in the well). The non-product monitoring wells were non-detect. There was 1.18 feet of product in the monitoring well (MW-7) near the former hoists that had previously shown the highest dissolved contaminant concentrations (the water in that monitoring well was not analyzed due to the presence of free product). Monitoring well MW-2 also had 0.01 feet of product. Depth to groundwater was 11.0 to 14.01 feet below ground surface. Groundwater flow direction was to the northeast. The consultant recommends continued quarterly groundwater monitoring to document trends in contamination concentrations. Monitoring wells were purged prior to sampling with a bladder pump. The consultant collected product samples to have them analyzed in the lab. The results of this analysis was not included in the report. Robert Weimer
2/1/2013 Document, Report, or Work plan Review - other June 15, 2012 groundwater sampling of 5 of the 6 site monitoring wells (monitoring well MW-7 was not sampled due to product in the well). The non-product monitoring wells were non-detect. There was 0.28 feet of product in the monitoring well (MW-7) near the former hoists that had previously shown the highest dissolved contaminant concentrations (the water in that monitoring well was not analyzed due to the presence of free product). Depth to groundwater was 9.9 to 12.7 feet below ground surface. Groundwater flow direction was to the southwest. The consultant recommends continued quarterly groundwater monitoring to document trends in contamination concentrations. Monitoring wells were purged prior to sampling with a bladder pump. Robert Weimer
2/12/2013 Document, Report, or Work plan Review - other August 14, 2012 groundwater sampling of 5 of the 6 site monitoring wells (monitoring well MW-7 was not sampled due to product in the well). The non-product monitoring wells were non-detect. There was 0.20 feet of product in the monitoring well (MW-7) near the former hoists that had previously shown the highest dissolved contaminant concentrations (the water in that monitoring well was not analyzed due to the presence of free product). Depth to groundwater was 10 to 12 feet below ground surface. Groundwater flow direction was to the southwest. The consultant recommends continued quarterly groundwater monitoring to document trends in contamination concentrations. Monitoring wells were purged prior to sampling with a bladder pump. Robert Weimer
4/22/2013 Document, Report, or Work plan Review - other October 27, 2012 groundwater sampling of 4 of the 6 site monitoring wells (monitoring wells 2 and 7 were not sampled this event). The non-product monitoring wells were non-detect. There was 0.20 feet of product in the monitoring well (MW-7) near the former hoists that had previously shown the highest dissolved contaminant concentrations (the water in that monitoring well was not analyzed due to the presence of free product). Depth to groundwater was 9 to 11 feet below ground surface. Groundwater flow direction was to the southwest. The monitoring wells were purged prior to sampling with a bladder pump. Robert Weimer
4/23/2013 Update or Other Action Given the product at the site the DEC is requesting continued quarterly groundwater monitoring. The DEC is also requesting that a work plan, including a schedule for conducting the work, be submitted by May 31, 2013 to 1.Define the extent of the free product on the groundwater. 2.Conducting a product bail down/pumping test to determine the product recovery rate and the rate that the product returns to any monitoring well with product. 3.The operation of a product recovery system (which could include a passive system depending on the rate that product return into the monitoring wells). 4. Any information collected on the characteristics (type) of the product recovered. Robert Weimer
4/23/2013 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 77691 name: piping leak 1996 and hydraulic oil Robert Weimer
5/16/2013 Update or Other Action ADEC grants an extension of providing a free product assessment and recovery work plan, including a schedule for conducting the work, until August 15, 2013 if the bail down/pump testing is conducted by June 30, 2013. ADEC will need a work plan for that portion of the work. Robert Weimer
6/20/2013 Update or Other Action ADEC requested that the RP provide the results of the past product analysis. Robert Weimer
9/26/2013 Meeting or Teleconference Held Discussed site status and future site work with Shell and their consultant. They need to define the extent of the product on the groundwater with additional well points, and they need to recover the product based on the rate it recovers. The consultant said that it did not recover in 4 hours, but was fully back to the original thickness when they checked 2 weeks later. They need determine what the recovery rate is between those two times. Robert Weimer
10/10/2013 Document, Report, or Work plan Review - other March 28, 2013 groundwater sampling of 5 of the 6 site monitoring wells (monitoring well 7 was not sampled this event). The non-product monitoring wells were non-detect. There was 0.39 feet of product in the monitoring well (MW-7) near the former hoists that had previously shown the highest dissolved contaminant concentrations (the water in that monitoring well was not analyzed due to the presence of free product). On April 1, 2013 the well has 0.45 feet of product, which was removed with an absorbent sock. Depth to groundwater was 11 to 13 feet below ground surface. Groundwater flow direction was to the southwest. The consultant recommends semi-annual groundwater monitoring to document trends in contamination concentrations. The monitoring wells were purged prior to sampling with a bladder pump. Robert Weimer
3/4/2014 Document, Report, or Work plan Review - other June 4, 2013 groundwater sampling of 5 of the 6 site monitoring wells (monitoring well 7 was not sampled this event). The non-product monitoring wells were non-detect. There was 0.93 feet of product in the monitoring well (MW-7) near the former hoists that had previously shown the highest dissolved contaminant concentrations (the water in that monitoring well was not analyzed due to the presence of free product). Depth to groundwater was 9.9 to 11.8 feet below ground surface. Groundwater flow direction was to the southwest. The monitoring wells were purged prior to sampling with a bladder pump. Since the sample interval in the monitoring well was not documented in the report or the field notes the results may be biased low. Robert Weimer
3/5/2014 Site Characterization Workplan Approved The November 2013 Site Investigation Work Plan for the 3304 Spenard Road site is approved with the following modifications: 1. An additional soil boring (E) is to be installed as utilities allow within 5 feet west of monitoring well MW-2. The soils need to be assessed to at least 14 feet below ground surface, with an analytical soil sample collected at the soil/water interface. An additional analytical sample will be collected if another depth appears to be potentially more contaminated based on field readings/observation. The samples are to analyzed for GRO, DRO, RRO, BTEX, PAHs, full VOCs, and metals. 2. For soil borings (B-D) at least one of the proposed analytical soil samples is to be collected at the soil/water interface. 3. The field notes and the site report need to document that the intake for groundwater sampling device is within a foot of the soil/water interface in each monitoring well. Robert Weimer
3/10/2014 Document, Report, or Work plan Review - other August 2, 2013 groundwater sampling of 5 of the 6 site monitoring wells (monitoring well 7 was not sampled this event do to the presence of free product). The non-product monitoring wells were non-detect. There was 2.12 feet of product in the monitoring well (MW-7) near the former hoists that had previously shown the highest dissolved contaminant concentrations (the water in that monitoring well was not analyzed due to the presence of free product). Depth to groundwater was 10.31 to 13.76 feet below ground surface. Groundwater flow direction was to the southwest. The monitoring wells were purged prior to sampling with a bladder pump. Since the sample interval in the monitoring well was not documented in the report or the field notes the results may be biased low. Robert Weimer
3/10/2014 Update or Other Action On August 2, 2013 2.12 feet of product was found in monitoring well MW-7. The absorbent sock that had been placed in the monitoring well on June 4, 2013 was saturated with product. A new sock was installed after measuring product on August 8, 2013. More aggressive product recovery is needed. Need baildown product recovery pilot test. Need to define the extent of the product. Robert Weimer
5/1/2014 Document, Report, or Work plan Review - other October 8, 2013 groundwater sampling of 5 of the 6 site monitoring wells (monitoring well 7 was not sampled this event do to the presence of free product). The five monitoring wells that were sampled were all non-detect for contamination, but there was 3.09 feet of product in the monitoring well (MW-7) near the former hoists that had previously shown the highest dissolved contaminant concentrations (the water in that monitoring well was not analyzed due to the presence of free product). Depth to groundwater was 9.20 to 13.24 feet below ground surface. Groundwater flow direction was to the southwest. The monitoring wells were purged prior to sampling with a bladder pump. Since the sample interval in the monitoring wells were not documented in the report or the field notes the results are considered biased low and can't be used for trend evaluation and site closure purposes. Robert Weimer
5/1/2014 Update or Other Action On October 10, 2013 3.09 feet of product was found in monitoring well MW-7. The absorbent sock that had been placed in the monitoring well was saturated with product. A new sock was installed after measuring product on October 14, 2013. More aggressive product recovery is needed. Need baildown product recovery pilot test. Need to define the extent of the product. Robert Weimer
7/29/2014 Update or Other Action Upate from consultant that a 30 gallon drum of purge water and a 10 gallon drum of absorbant socks were stolen from the site. In the future the drums will either be stored inside the building or in a fenced area. 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 and 9 drums of contaminated soil. Robert Weimer
10/20/2014 Offsite Soil or Groundwater Disposal Approved ADEC approves request to treat 1 drum of contaminated purge water and 1 drum of adsorbents with lube/hydraulic oil. Robert Weimer
2/17/2015 Document, Report, or Work plan Review - other March 31, 2014 groundwater sampling of 5 of the 6 site monitoring wells (monitoring well 7 was not sampled this event do to the presence of free product). The five monitoring wells that were sampled were non-detect for contamination, but there was 3.91 feet of product in the monitoring well (MW-7) near the former hoists that had previously shown the highest dissolved contaminant concentrations (the water in that monitoring well was not analyzed due to the presence of free product). Depth to groundwater was 10.59 to 16.32 feet below ground surface. Groundwater flow direction was to the northwest. The monitoring wells were purged prior to sampling with a bladder pump. Since the intake for the bladder pump in some of the monitoring wells was not near the soil/water interface as required the results for those monitoring wells are considered biased low and can't be used for trend evaluation and site closure purposes. Robert Weimer
5/15/2015 Document, Report, or Work plan Review - other June 23-25, 2014 five soil borings were sampled between 4.5 to 22 feet below ground surface. Up to 476 mg/kg DRO (SB-9 at 15 feet below ground surface), non-detect (<11.5 mg/kg) GRO, 163 mg/kg RRO, 30 mg/kg Chromium, and non-detect (<0.0618 mg/kg) benzene (9 of the 10 samples analyzed for benzene had detection limits that exceeded site cleanup levels). Robert Weimer
5/15/2015 Document, Report, or Work plan Review - other August 6-13, 2014 groundwater sampling of 1 of the 8 site monitoring wells (monitoring well 7 was not sampled this event do to the presence of free product). Up to non-detect(<100 ug/l) GRO (2,200 ug/l cleanup level), non-detect(<1.0 ug/l) benzene (5 ug/l cleanup level), 145 ug/l DRO (1,500 ug/l cleanup level), and 514 ug/l RRO (1,100 ug/l cleanup level) in the groundwater, but there was 0.57 feet of product in the monitoring well (MW-7) near the former hoists that had previously shown the highest dissolved contaminant concentrations (the water in that monitoring well was not analyzed due to the presence of free product). Depth to groundwater was 10.03 to 12.17 feet below ground surface. Groundwater flow direction was to the southwest. Groundwater samples were collected by purge method with a bladder pump. The intake for the pump was near the top of the water column as required. Robert Weimer
5/18/2015 Update or Other Action ADEC approves, until further notice, suspending analytical sampling of monitoring wells MW-1, MW-2, and MW-4. ADEC also approves reduction of analytical sampling of monitoring wells MW-5 and MW-6 to semi-annual. ADEC does request that monitoring wells MW-7, MW-8, MW-9, and MW-10 continue to be monitored on a quarterly basis. Robert Weimer
5/18/2015 Document, Report, or Work plan Review - other June 3, 2014 groundwater sampling of 5 site monitoring wells (monitoring well 7 was not sampled this event do to the presence of free product). Up to non-detect(<100 ug/l) GRO (2,200 ug/l cleanup level), non-detect(<1.0 ug/l) benzene (5 ug/l cleanup level), 163 ug/l DRO (1,500 ug/l cleanup level), and 144 ug/l RRO (1,100 ug/l cleanup level) in the groundwater, but there was 0.43 feet of product in the monitoring well (MW-7) near the former hoists that had previously shown the highest dissolved contaminant concentrations (the water in that monitoring well was not analyzed due to the presence of free product). Depth to groundwater was 10.10 to 12.35 feet below ground surface. Groundwater flow direction was to the west by southwest. Groundwater samples were collected by purge method with a bladder pump. The intake for the pump was not near the top of the water column as required in monitoring wells MW2, MW4, and MW6, the results in those monitoring wells are considered biased low and can't be used to define the extent of contamination or trends. Robert Weimer
5/18/2015 Document, Report, or Work plan Review - other October 1, 2014 groundwater sampling of 1 of the 9 site monitoring wells (monitoring well 7 was not sampled this event do to the presence of free product). Up to non-detect(<100 ug/l) GRO (2,200 ug/l cleanup level), non-detect(<1.0 ug/l) benzene (5 ug/l cleanup level), 91 ug/l DRO (1,500 ug/l cleanup level), and non-detect(<980 ug/l) RRO (1,100 ug/l cleanup level) in the groundwater, but there was 0.03 feet of product in the monitoring well (MW-7) near the former hoists that had previously shown the highest dissolved contaminant concentrations (the water in that monitoring well was not analyzed due to the presence of free product). Depth to groundwater was 9.71 to 11.2 feet below ground surface. Groundwater flow direction was to the southwest. Groundwater samples were collected by purge method with a bladder pump. The intake for the pump was near the top of the water column as required. Robert Weimer
10/22/2015 Document, Report, or Work plan Review - other March 25, 2015 groundwater sampling of 7 of the 9 site monitoring wells (monitoring well 7 was not sampled this event do to the presence of free product, monitoring well MW-4 was obstructed with ice). Up to non-detect (<50 ug/l) GRO (2,200 ug/l cleanup level), 0.2 ug/l benzene (5 ug/l cleanup level), 97.8 ug/l DRO (1,500 ug/l cleanup level), and 137 ug/l RRO (1,100 ug/l cleanup level) in the groundwater, but there was 0.25 feet of product in the monitoring well (MW-7) near the former hoists that had previously shown the highest dissolved contaminant concentrations (the water in that monitoring well was not analyzed due to the presence of free product). Concentrations increased in 1 of the 7 monitoring wells sampled. Depth to groundwater was 11.2 to 13.1 feet below ground surface. Groundwater flow direction was to the southwest. Groundwater samples were collected by purge method with a bladder pump. The intake for the pump was near the top of the water column as required except for two monitoring wells were is was not documented in the field notes. Robert Weimer
11/2/2015 Offsite Soil or Groundwater Disposal Approved ADEC approves request to treat 1 drum of contaminated purge water at NCR's facility at 2020 Viking Drive. Robert Weimer
2/5/2016 Document, Report, or Work plan Review - other June 5, 2015 groundwater sampling of 3 of the 9 site monitoring wells (monitoring well 7 was not sampled this event do to the presence of free product). Up to 0.067 mg/l DRO, 0.103 mg/l RRO and non-detect GRO and benzene in the groundwater, but there was 2.5 feet of product observed on the absorbent sock in monitoring well (MW-7) that had previously shown the highest dissolved contaminant concentrations (the water in that monitoring well was not analyzed due to the presence of free product). Concentrations increased in 3 of the 3 monitoring wells sampled. Depth to groundwater was 11.32 to 12.86 feet below ground surface. Groundwater flow direction was to the southwest. Groundwater samples were collected with a bladder pump after purging. The intake for the pump was near the top of the water column as required. They plan to bail product from monitoring well MW-7 during the next monitoring event. Robert Weimer
2/23/2016 Document, Report, or Work plan Review - other August 25, 2015 groundwater sampling of 5 of the 9 site monitoring wells (monitoring well 7 was not sampled this event do to the presence of free product). Up to 0.0515 mg/l DRO, 0.239 mg/l RRO and non-detect GRO and benzene in the groundwater, but there was 0.75 inch of product observed after the absorbent sock in monitoring well (MW-7) was removed. MW-7 had previously shown the highest dissolved contaminant concentrations (the water in that monitoring well was not analyzed due to the presence of free product). Concentrations increased in 5 of the 5 monitoring wells sampled. Depth to groundwater was 11.31 to 12.86 feet below ground surface. Groundwater flow direction was to the southwest. Groundwater samples were collected with a submersible pump after purging. The intake for the pump was near the top of the water column as required. They plan to bail product from monitoring well MW-7 during the next monitoring event. Robert Weimer
3/8/2016 Document, Report, or Work plan Review - other October 19, 2015 groundwater sampling of 5 of the 9 site monitoring wells (monitoring well 7 was not sampled this event do to the presence of free product). Up to 0.0832 mg/l DRO, 0.164 mg/l RRO and non-detect GRO and benzene in the groundwater, but there was product observed after the absorbent sock in monitoring well (MW-7) was removed. MW-7 had previously shown the highest dissolved contaminant concentrations (the water in that monitoring well was not analyzed due to the presence of free product). DRO concentrations increased in 5 of the 5 monitoring wells sampled. Depth to groundwater was 10.22 to 12.10 feet below ground surface. Groundwater flow direction was to the southwest. Groundwater samples were collected with a submersible pump after purging. The intake for the pump was near the top of the water column as required except in monitoring well MW-9 where the depth was not documented. They plan to bail product from monitoring well MW-7 during the next monitoring event. 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 is requesting at least one groundwater monitoring event to include PAHs. DEC is requesting a bail down test be conducted in monitoring well MW-7 to determine the frequency/type of product recovery or to submit a work plan to excavate the contaminated source area (and take excavation confirmation samples) and pump out all of the remaining product during the excavation work. We discussed that since there is free product in the hoist area which would over maximum allowable concentration that area will need confirmation soil samples in the future demonstrating have been remediated below levels for closure with ICs. DEC requested rose diagrams showing historical groundwater flow directions be included in future site monitoring report maps. Robert Weimer
5/23/2016 Offsite Soil or Groundwater Disposal Approved ADEC approves request to transport drum of purge water (and future drums of purge water from this site) to the Shell Station site at 810 W. Tudor Road for temporary storage. The treatment of the purge water is to be provided under a future request. ADEC requests notification of future transports of purge water prior to transport. 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
7/28/2016 Document, Report, or Work plan Review - other March 30, 2016 groundwater sampling of 3 of the 9 site monitoring wells (monitoring well 7 was not sampled this event do to the presence of free product). Up to 0.0675 mg/l DRO, 0.114 mg/l RRO and non-detect GRO and benzene in the groundwater, but there was 1.3 feet of product observed after the absorbent sock in monitoring well (MW-7) was removed. MW-7 had previously shown the highest dissolved contaminant concentrations (the water in that monitoring well was not analyzed due to the presence of free product). DRO concentrations increased in 0 of the 3 monitoring wells sampled. Depth to groundwater was 12.05 to 12.70 feet below ground surface. Groundwater flow direction was to the southwest. Groundwater samples were collected with a submersible pump after purging. The intake for the pump was near the top of the water column as required. during this monitoring event 2.5 gallons of product was removed from monitoring well MW-7 using a bailer. 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. DEC is requesting a bail down test be conducted in monitoring well MW-7 to determine the frequency/type of product recovery or to submit a work plan to excavate the contaminated source area (and take excavation confirmation samples) and pump out all of the remaining product during the excavation work. We discussed that since there is free product in the hoist area which would over maximum allowable concentration that area will need confirmation soil samples in the future demonstrating have been remediated below levels for closure with ICs. Robert Weimer
11/3/2016 Document, Report, or Work plan Review - other The August 22, 2016 PAH Sampling work plan is approved under the condition that monitoring well MW-5 is added to the PAH analysis list. Robert Weimer
11/3/2016 Document, Report, or Work plan Review - other The August 25, 2016 Enhanced Fluid recovery Event Work Plan is approved. The work plan proposes to use a vacuum truck to remove up to 100 gallons of water and floating product from monitoring well MW-7 and to measure the rate that product returns to that monitoring well. Monitoring well MW-7 has historically had up to 3.91 feet of product. Robert Weimer
12/14/2016 Document, Report, or Work plan Review - other September 29, 2016 groundwater sampling of 6 of the 9 site monitoring wells (monitoring well 7 was not sampled this event do to the presence of free product). Non-detect DRO, RRO, PAH, GRO and benzene in the groundwater in the monitoring wells sampled, but the laboratory reporting limits for the samples exceeded detections in past monitoring events. Depth to groundwater was 11.05 to 12.10 feet below ground surface. Groundwater flow direction was to the southwest. Groundwater samples were collected with a bladder pump after purging. The intake for the pump was within the top foot of the water column as required. Product thickness measurement and product recovery in monitoring well MW-7 was not conducted during this monitoring event. 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 be conducting the enhanced fluid recovery in monitoring well MW-7 soon. We discussed that monitoring well MW-7 the will need a minimum of 4 quarters of groundwater monitoring to evaluate seasonal changes in dissolved concentrations and they will need to assess the extent of remaining soil contamination in that area. Robert Weimer
4/12/2017 Document, Report, or Work plan Review - other The April 11, 2017 revised Enhanced Fluid recovery Event Work Plan is approved. The work plan proposes to use a vacuum truck to remove up to 100 gallons of water and floating product from monitoring well MW-7 and to measure the rate that product returns to that monitoring well. Monitoring well MW-7 has historically had up to 3.91 feet of product. Robert Weimer
8/2/2017 Document, Report, or Work plan Review - other On April 20, 2017 a vacuum truck was used to remove 442 gallons of water and floating product from monitoring well MW-7 over a 145 minute period. Monitoring well MW-7 has 3.13 feet of product before pumping and 0.0 feet of measurable product after pumping. Drawdown was 1.31 feet at end of the fluid recovery. Just after pumping was completed a groundwater sample was collected and analyzed for DRO and RRO. It had 16.1 mg/l DRO and 79.9 mg/l RRO. The report did not document how the groundwater samples were collected or what interval that was sampled in the monitoring well. Since the water samples were received over temperature at 16.3 degrees C 4 days later at the lab the results are considered biased low. The report also did not document the rate that product returns to that monitoring well as specified in the approved work plan. They plan to conduct another enhanced fluid recovery event prior to October 2017. 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 another fluid recovery event in October if there is still measurable product in that well. As part of the product recovery they will monitor how fast the product returns. We discussed recent problems with groundwater samples arriving at the lab 4 days later over temperature. Once product has bee recovered to the extent practicable the site can be evaluated for closure with ICs (for the contaminated soil left under the building), may not need confirmation soil samples and full 4 quarters of groundwater monitoring once product recovered to extent practicable for closure with ICs. Robert Weimer
9/25/2017 Offsite Soil or Groundwater Disposal Approved DEC approves request to transport to NRC for treatment of approximately 100 gallons of water and floating product from monitoring well MW-7. Robert Weimer
12/21/2017 Document, Report, or Work plan Review - other On September 27, 2017 a vacuum truck was used to remove 96 gallons of water and floating product from monitoring well MW-7 over a 50 minute period. Monitoring well MW-7 had 0.52 feet of product before pumping and 0.0 feet of measurable product after pumping. Drawdown was 0.47 feet at end of the fluid recovery. They returned 24 hours later to measure product and the product had returned to 0.74 feet in thickness, 24 hours after that it was at 1.35 feet of product thickness. They plan to conduct another enhanced fluid recovery event in April 2018. 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 another fluid recovery event in April if there is still measurable product in that well. As part of the product recovery they will monitor how fast the product returns. May need to install a larger recovery well or use active or passive skimmer to recover product. Once product has been recovered to the extent practicable the site can be evaluated for closure with ICs (for the contaminated soil left under the building), may not need confirmation soil samples and full 4 quarters of groundwater monitoring once product recovered to extent practicable for closure with ICs. 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 another fluid recovery event in April if there is still measurable product in that well. As part of the product recovery they will monitor how fast the product returns. May need to install a larger recovery well or use active or passive skimmer to recover product. Once product has been recovered to the extent practicable (remains less than 1 inch and not recoverable) the site can be evaluated for closure with ICs (for the contaminated soil left under the building), may not need confirmation soil samples and full 4 quarters of groundwater monitoring once product recovered to extent practicable for closure with ICs. They will look at supplementing interface probe measurements with product bailer. We discussed that the bailer would show a smaller thickness than what is actually in the well. Robert Weimer
8/15/2018 Meeting or Teleconference Held Meeting with Shell with Shells consultant (GES) to discuss future site work for site closure. The most recent product measurement on April 27, 2018 only trace amounts of product and a sheen was encountered. We discussed that they will need to continue to measure product at least quarterly, recover any product, and collect a minimum of four quarters of groundwater samples in monitoring well MW7. If there is more than 1" in product they are to report it immediately and they as part of the product recovery they will monitor how fast the product returns. Conditional approval letter for the decommissioning of the other site monitoring wells is to be issued soon. 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
8/17/2018 Document, Report, or Work plan Review - other On April 27, 2018 only trace amounts of product and a sheen was encountered in monitoring well MW7 at the start of the product drawdown event. Depth to groundwater was 12.66 feet below ground surface (bgs) at the start and the same at the end after 30 minutes of low flow pumping removed 3 gallons of contaminated water and no measurable product. No product was measurable with the interface probe or observed in the bailer one hour later. Purge water was treated with granular activated carbon (GAC) and the treated water was discharged in a previously approved area on the property. Robert Weimer
8/31/2018 Document, Report, or Work plan Review - other DEC conditionally approves July 25, 2018 monitoring well decommissioning work plan. The plan proposes to decommission all of the site monitoring wells except for monitoring well MW-7 which still has product and will require groundwater monitoring once product is no longer in it. The condition is that the decommissioning of monitoring well MW-7 will be conducted under a separate work plan. Robert Weimer
1/16/2019 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77691 piping leak 1996 and hydraulic oil. Robert Weimer
2/15/2019 Document, Report, or Work plan Review - other On September 25, 2018 monitoring wells MW-1, MW-2, MW-4, MW-5, MW-6, MW-8, MW-9, and MW-10 were decommissioned. Each of these monitoring wells where checked for any product before decommissioning, and no product was found in any of these monitoring wells. Only monitoring well MW-7 remains on the property. Robert Weimer
8/21/2019 Document, Report, or Work plan Review - other On September 27, 2018 a LNAPL drawdown test was conducted in monitoring well MW-7. Groundwater was at 12.85 feet below ground surface (bgs) with 0.2 feet of product. After 45 minutes of pumping groundwater was at 12.65 feet bgs with 0.03 feet of product. The consultant plans to conduct additional LNAPL measurements in 2019. Robert Weimer
8/23/2019 Document, Report, or Work plan Review - other On January 24, 2019 a LNAPL drawdown test was conducted in monitoring well MW-7. Groundwater was at 13.60 feet below ground surface (bgs) with 0.53 feet of product. After 90 minutes of pumping groundwater was at 13.16 feet bgs with 0.08 feet of product. The consultant plans to conduct additional LNAPL measurements in 2019. After waiting 90 minutes after pumping stopped the water was 13.32 feet bgs with 0.15 feet of product. A bailer was used to collect a water sample for analysis for DRO and RRO. A sheen was observed on that water. The sample contained up to 3.88 mg/l DRO and 17.1 mg/l RRO. Robert Weimer
8/26/2019 Document, Report, or Work plan Review - other On March 27, 2019 a LNAPL drawdown test was conducted in monitoring well MW-7. Groundwater was at 13.61 feet below ground surface (bgs) with 0.39 feet of product. After 17 minutes of pumping groundwater was at 13.31 feet bgs with 0.01 feet of product. After waiting 10 minutes after pumping stopped the water was 13.30 feet bgs with 0.01 feet of product. After an additional 22 hours the water was 13.23 bgs with 0.02 feet of product. The next day (24 hours later) the water was 13.21 feet bgs with 0.01 feet of product. No analytical sample was collected during this 3 day LNAPL drawdown test. Robert Weimer
8/28/2019 Meeting or Teleconference Held Meeting with Shell with Shells consultant (GES) to discuss future site work for site closure. GES will provide a diagram showing the remaining soil contamination above migration to groundwater, human health, and maximum allowable cleanup levels. DEC is to evaluate if they need additional groundwater monitoring events in MW-7 besides the ones conducted on April 20, 2017 and January 24, 2019. Monitoring well MW-7 will need to be decommissioned in accordance with an approved plan prior to any site closure with ICs. Robert Weimer
5/22/2020 Document, Report, or Work plan Review - other ADEC sent the RP an email with the comment letter regarding the LNAPL Baildown Test Analyses report dated November 26, 2019 attached. 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
1/26/2021 Site Characterization Report Approved The CSP approved the Revised LNAPL Test Analyses report prepared by GES, Inc. on January 26, 2021. The report was approved via electronic letter. Randy Guintu
9/1/2021 Update or Other Action ADEC provided comments on a first draft of an environmental covenant document. RP indicated that historical soil sample data will be emailed to ADEC. Flannery Ballard
10/7/2021 Update or Other Action ADEC received, via email, the historical soil sample data as well as a Work Plan request to decommission MW-7, the last remaining ground monitoring well at the site. Flannery Ballard
10/20/2021 Site Characterization Workplan Approved The ADEC approved the work plan to decommission monitoring well, MW-7. The ADEC concurs with the findings in the revised LNAPL report that the transmissivity of the free product is too low to be practically recoverable at this time. If site conditions change, future product recovery may be necessary. A final report of work completed is due to the department by December 31, 2021. Flannery Ballard
10/25/2021 Workplan Requested The ADEC requested a work plan to evaluate for vapor intrusion at the site. As MW-7 contains free product and is housed inside the service station building, the risk of vapor intrusion exists at the site and must be evaluated. Flannery Ballard
2/3/2022 Update or Other Action The ADEC approves the December 2021 Well Decommissioning Report. MW-7 was decommissioned on October 29, 2021. Flannery Ballard
5/21/2024 Site Characterization Workplan Approved Reviewed the “Work Plan for Indoor Air Sampling for Shell Branded Wholesale Facility (Texaco Service Station 63-057-0024) Anchorage, Alaska; File No. 2100.26.102”, dated May 3, 2024. The work plan scope of work consists of completing the ADEC Buildings Inventory and Indoor Air Sampling Questionnaires and collecting indoor and outdoor air samples. The air samples will be analyzed for volatile organic compounds (VOCs) by EPA Method TO-15. Alena Voigt

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State of Alaska Department of Environmental Conservation

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