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Site Report: Texaco #61, 2000 Used Oil Tank Release

Site Name: Texaco #61, 2000 Used Oil Tank Release
Address: 3635 Mountain View Drive, Anchorage, AK 99508
File Number: 2100.26.620
Hazard ID: 27112
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 61.224404
Longitude: -149.812926
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

On December 19, 2000 contamination was found during the removal of a 550-gallon used oil underground storage tank (UST #1). Soil samples collected from the excavation had up to 0.0402 mg/kg benzene. In 2007 five monitoring wells were installed and were sampled until 2016. Detectable PCE and petroleum contamination was consistently below cleanup levels. A 2011 Conceptual Site Model identified that property is currently operated as a commercial gas station and a restaurant, but is zoned B-3 so could be used for residential development in the future. In 2013 two soil gas probes were installed near the service station building and one sub-slab vapor probe was installed inside the building. These probes were sampled in 2013 and 2014. The initial sampling event exceed ADEC screening levels for Tetrachloroethylene (PCE), and the subsequent two sampling events were inconclusive due leakage in the surface seals of the indoor sub-slab vapor probe. Indoor air sampling conducted in September 2017 identified benzene contamination over screening levels. Additional indoor air sampling was conducted during frozen ground conditions in February 2018 and non-frozen ground conditions in September 2018, and for both of those events the indoor air samples were below screening levels. In 2018 the five site monitoring wells were decommissioned in accordance with an approved work plan. Additional contamination was identified at this property in 1996 from the gasoline/diesel piping and dispensers and in 1999 from floor drains /sand traps under the building. These areas of contamination are managed under separate file numbers (2100.26.100 and 2100.38.579 respectively). A closure letter was issued for this site.

Action Information

Action Date Action Description DEC Staff
6/27/2019 Site Added to Database A new site has been added to the database Mitzi Read
6/27/2019 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST site created in CSP database for source area 2000 Used Oil Tank Release, 80476 Mitzi Read
6/28/2019 Document, Report, or Work plan Review - other On December 19, 2000 additional contamination was found during the removal of a used oil tank just south of the building. Excavation samples collected between 7 feet to 9.5 feet below ground surface had up to 0.0402 mg/kg benzene, 11.6 mg/kg DRO, and non-detect RRO and PCE. Robert Weimer
6/28/2019 Update or Other Action On 6/20/2001 ADEC letter requesting information regarding a 12/19/00 used oil tank removal. Need detailed site sketch, piping location, field readings, samples for excavated soil and piping run. Robert Weimer
6/28/2019 Offsite Soil or Groundwater Disposal Approved On 12/7/2001 ADEC approved 30 cubic yards of soil from the used oil tank removal to go to ASR for thermal treatment. Robert Weimer
6/28/2019 Update or Other Action On 2/9/2005 ADEC discussed site with RP's consultant. He will resubmit the requested work plan and also provide the information requested regarding the 2000 used oil tank removal. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other On 5/4/2006 ADEC issues a conditional approval letter for the installation and sampling of 5 monitoring wells. The samples are to be analyzed for BTEX, GRO, DRO, RRO, and HVOC. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other On May 21-24, 2007 and June 7-8, 2007 five monitoring wells were installed and were sampled. Up to 59.2 mg/kg RRO in the soil samples collected. BTEX, GRO, and DRO soil samples were non-detect. Non-detect BTEX, DRO, and RRO in the groundwater. Depth to groundwater was between 31.63 and 32.81 feet below ground surface. Groundwater flow direction was to the west by northwest. Several shallow soil samples are biased low because the boring was air knifed to that depth. Soil and groundwater samples collected in monitoring wells MW-4 and MW-5 were not sampled for BTEX, GRO, and VOC's are required in the ADEC work plan approval letter. Groundwater samples were not analyzed for GRO as required. QA/QC problems with the soil data. Monitoring wells have a screened interval from 30 to 40 feet below ground surface. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other September 25, 2007 groundwater sampling event. Up to 0.69 ug/l chloroform (100 ug/l cleanup level), 0.93 ug/l PCE (5 ug/l cleanup level), and non-detect benzene, RRO, and DRO in the groundwater samples collected. Depth to groundwater was 32.96 to 33.32 feet below ground surface. Groundwater flow direction was to the west. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other December 11, 2007 groundwater sampling event. Up to 0.71 ug/l chloroform (100 ug/l cleanup level), 0.85 ug/l PCE (5 ug/l cleanup level) and non-detect benzene, RRO, and DRO in the groundwater samples collected. Depth to groundwater was 32.90 to 33.69 feet below ground surface. Groundwater flow direction was to the west. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other March 30, 2008 groundwater sampling event. Up to 0.63 ug/l chloroform (100 ug/l cleanup level), 0.86 ug/l PCE (5 ug/l cleanup level) and non-detect benzene, RRO, and DRO in the groundwater samples collected. Depth to groundwater was 32.01 to 33.14 feet below ground surface. Groundwater flow direction was to the west. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other June 12, 2008 groundwater sampling event. Up to 1.1 ug/l PCE (5 ug/l cleanup level) and non-detect chloroform, benzene, RRO, and DRO in the groundwater samples collected. Depth to groundwater was 31.36 to 32.48 feet below ground surface. Groundwater flow direction was to the west. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other September 19, 2008 groundwater sampling event. Up to 0.84 ug/l chloroform (100 ug/l cleanup level), 1.2 ug/l PCE (5 ug/l cleanup level) and non-detect benzene, RRO, and DRO in the groundwater samples collected. Depth to groundwater was 31.19 to 32.32 feet below ground surface. Groundwater flow direction was to the northwest. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other December 2, 2008 groundwater sampling event. Up to 0.68 ug/l chloroform (100 ug/l cleanup level), 1.0 ug/l PCE (5 ug/l cleanup level)and non-detect benzene, RRO, GRO and DRO in the groundwater samples collected. Depth to groundwater was 31.71 to 33.84 feet below ground surface. Groundwater flow direction was to the north east. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other March 23, 2009 groundwater sampling event. Five monitoring wells were sampled. Up to 0.93 ug/l chloroform (100 ug/l cleanup level), 1.3 ug/l PCE (5 ug/l cleanup level) and non-detect benzene, RRO, GRO, and DRO in the groundwater samples collected. Depth to groundwater was 30.06 to 33.14 feet below ground surface. Groundwater flow direction was to the northeast. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other June 8, 2009 groundwater sampling event. Five monitoring wells were sampled. Up to 0.87 ug/l chloroform (100 ug/l cleanup level), 1.0 ug/l PCE (5 ug/l cleanup level) and non-detect benzene, RRO, GRO, and DRO in the groundwater samples collected. Contamination decreased. Depth to groundwater was 31.98 to 33.14 feet below ground surface. Groundwater flow direction was to the east. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other September 16, 2009 groundwater sampling event. Five monitoring wells were sampled. Up to 0.79 ug/l chloroform (100 ug/l cleanup level), 0.6 ug/l PCE (5 ug/l cleanup level) and non-detect benzene, RRO, GRO, and DRO in the groundwater samples collected. Contamination decreased. Depth to groundwater was 32.19 to 33.32 feet below ground surface. Groundwater flow direction was to the east. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other December 9, 2009 groundwater sampling event. Five monitoring wells were sampled. Up to 0.72 ug/l chloroform (100 ug/l cleanup level), 0.89 ug/l PCE (5 ug/l cleanup level) and non-detect benzene, RRO, GRO, and DRO in the groundwater samples collected. Contamination increased in 2 of the 5 monitoring wells sampled. Depth to groundwater was 32.29 to 33.42 feet below ground surface. Groundwater flow direction was to the west. Robert Weimer
6/28/2019 Update or Other Action On 3/22/2010 ADEC approves requests to reduce groundwater monitoring from quarterly to semi-annual. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other March 10, 2010 groundwater sampling event. Five monitoring wells were sampled. Up to 0.80 ug/l chloroform (100 ug/l cleanup level), 0.81 ug/l PCE (5 ug/l cleanup level) and non-detect benzene, RRO, GRO, and DRO in the groundwater samples collected. Contamination increased in 1 of the 5 monitoring wells sampled. Depth to groundwater was 32.58 to 33.62 feet below ground surface. Groundwater flow direction was to the west. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other May 15, 2010 groundwater sampling event. Five monitoring wells were sampled. Up to 0.82 ug/l chloroform (100 ug/l cleanup level), 1.0 ug/l PCE (5 ug/l cleanup level) and non-detect benzene, RRO, GRO, and DRO in the groundwater samples collected. Contamination increased in 4 of the 5 monitoring wells sampled. Depth to groundwater was 31.76 to 32.94 feet below ground surface. Groundwater flow direction was to the west. Robert Weimer
6/28/2019 Offsite Soil or Groundwater Disposal Approved On 7/20/2011 ADEC approves request for transport and treatment of 1 drum of contaminated monitoring well purge water. Robert Weimer
6/28/2019 Offsite Soil or Groundwater Disposal Approved On 11/28/2011 ADEC approves request for transport and treatment of 1 drum of contaminated monitoring well purge water. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other April 14, 2011 groundwater sampling event. Five monitoring wells were sampled. Up to 0.6 ug/l chloroform (100 ug/l cleanup level), 0.82 ug/l PCE (5 ug/l cleanup level) and non-detect benzene, RRO, GRO, and DRO in the groundwater samples collected. Contamination increased in 0 of the 5 monitoring wells sampled. Depth to groundwater was 32 to 33 feet below ground surface. Groundwater flow direction was to the west. Robert Weimer
6/28/2019 Conceptual Site Model Submitted Conceptual Site Model (CSM) dated December 1, 2011. The CSM identified that the site is currently commercial but could be used as residential in the future (zoned B-3). Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other October 5, 2011 groundwater sampling event. Five monitoring wells were sampled. The samples were non-detect for benzene, GRO, RRO, chloroform, MTBE, and PCE and in the groundwater samples collected. Contamination increased in 0 of the 5 monitoring wells sampled. Depth to groundwater was 32 to 33 feet below ground surface. Groundwater flow direction was to the northwest. Robert Weimer
6/28/2019 Offsite Soil or Groundwater Disposal Approved On 10/30/2012 ADEC approves request for transport and treatment of 1 drum of contaminated monitoring well purge water. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other June 14-15, 2012 groundwater sampling event. Five monitoring wells were sampled. The samples were non-detect for benzene, GRO, RRO, chloroform, MTBE, and PCE and in the groundwater samples collected. Contamination increased in 0 of the 5 monitoring wells sampled. Depth to groundwater was 31 to 32 feet below ground surface. Groundwater flow direction was to the northwest. Samples were collected with bladder pump after monitoring wells were purged. Robert Weimer
6/28/2019 Update or Other Action 3/22/2013 DEC request 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 DEC requests that it be done on the following event. Robert Weimer
6/28/2019 Update or Other Action On 5/8/2013 DEC confirmed that since the previous groundwater samples were collected after purging, that the DEC is not requesting a purge/no purge comparison sampling event for this site. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other On 10/01/2013 DEC approved September 10, 2013 Site Investigation Work Plan. The plan proposes to install soil gas probes and sub-slab vapor probes and to monitor the groundwater for metals and PAHs. There will need to be another late winter or early spring vapor sampling event conducted with frozen ground conditions. 3.3.1 – Recommend 1 Liter Summa Canisters to reduce sample volume and ensure a more representative sample. 3.3.3 - Recommend analyze helium with a portable hand held device so any leaks can be fixed in the field. 3.3.3 – If possible need to do a "shut in" leak test as described in the DEC guidance. 1.2.4 – Recommend three volumes of sample train purged prior to sample collection. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other June 17, 2013 groundwater sampling event. Five monitoring wells were sampled. The samples were non-detect for benzene, GRO, RRO, chloroform, MTBE, and PCE and in the groundwater samples collected. Contamination increased in 0 of the 5 monitoring wells sampled. Depth to groundwater was 31 to 32 feet below ground surface. Groundwater flow direction was to the west by northwest. Samples were collected with bladder pump after monitoring wells were purged, but the results may be biased low because the sample interval was not documented in the report or field notes. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other On 3/11/2014 DEC review of Vapor Intrusion Site Investigation report. Two soil gas probes at 5 feet below ground surface (bgs)and one sub-slab vapor probe at 1.5 feet bgs were installed and sampled on October 2-4, 2013 at the site. Up to 0.857 ppbv benzene (1.14 ppbv screening level), 61.5 ppbv PCE (262 ppbv screening level), 0.299 ppv TCE (16.1 ppbv screening level). There will need at least another late winter or early spring vapor sampling event conducted with frozen ground conditions. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other August 5, 2013 groundwater sampling event. Two monitoring wells were sampled. The samples were non-detect for benzene, GRO, RRO, chloroform, MTBE, and PCE and in the groundwater samples collected. Groundwater samples were also analyzed for PAH and metals. The PAH samples were non-detect. Metals analysis was non-detect except for barium that was up to 9.1 ug/l (2,000 ug/l cleanup level). Depth to groundwater was 32.4 to 32.59 feet below ground surface. Groundwater flow direction previously was to the west by northwest. Samples were collected with bladder pump after monitoring wells were purged, but the results may be biased low because the sample interval was not documented in the report or field notes. Robert Weimer
6/28/2019 Offsite Soil or Groundwater Disposal Approved On 8/8/2014 ADEC approves request for transport and treatment of 1 drum of contaminated monitoring well purge water. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other June 12, 2014 groundwater sampling event. Two monitoring wells were sampled. Up to 0.423 ug/l PCE (5 ug/l cleanup level) and non-detect for benzene, GRO, RRO, chloroform, and MTBE in the groundwater samples collected. Contamination increased in 1 of the 5 monitoring wells sampled. Depth to groundwater was 31.51 to 32.66 feet below ground surface. Groundwater flow direction previously was to the west by southwest. Samples were collected with bladder pump after monitoring wells were purged. The sample from monitoring well MW-5 may be biased low because the pump intake depth was not recorded. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other On 8/7/2015 DEC reviewed the Vapor Intrusion Site Investigation report for March 28, 2014 frozen ground conditions vapor sampling. Two soil gas probes at 5 feet below ground surface (bgs) and one sub-slab vapor probe at 1.5 feet bgs were installed and sampled on October 2-4, 2013 at the site. The soil gas samples had up to non-detect (<0.500 ppbv) benzene (50.16 ppbv screening level), 41.5 ppbv PCE (265.5 ppbv screening level), non-detect (<0.400 ppbv) TCE (16.4 ppbv screening level). Because helium was detected in the vapor sample from the sub-slab probe, it results are influenced by indoor air because of leakage. A second unfrozen ground site condition soil gas sampling is scheduled for October 2014. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other June 26-27, 2015 groundwater sampling event. Two monitoring wells were sampled. Up to 0.58 ug/l PCE (5 ug/l cleanup level), 0.031 mg/kg DRO, and non-detect for benzene, RRO, chloroform, and MTBE in the groundwater samples collected. Contamination increased in 1 of the 5 monitoring wells sampled. Depth to groundwater was 32.15 to 33.30 feet below ground surface. Groundwater flow direction previously was to the west. Samples were collected with bladder pump at the top of water column after monitoring wells were purged. Robert Weimer
6/28/2019 Meeting or Teleconference Held On 3/15/2016 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 annual groundwater monitoring event to include PAHs, BTEX, GRO, DRO, RRO, full VOCs, metals, EDB and 1,2-DCA. We discussed that since RRO (30,000 mg/kg) was left at the site over the maximum allowable RRO concentration (22,000 mg/kg) that area will need confirmation soil samples in the future demonstrating it has been remediated below levels for closure with ICs. There are also areas of the site (piping/dispenser/tanks/under building) where the extent of the contamination has not been defined, that will need to be defined to evaluate the site for closure. We also discussed that additional vapor intrusion (VI) sampling will need to be conducted in frozen and non-frozen conditions with either indoor air or repaired soil gas sampling in accordance with a new approved work plan. DEC requested rose diagrams showing historical groundwater flow directions be included in future site monitoring report maps. Robert Weimer
6/28/2019 Update or Other Action On 7/27/2016 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
6/28/2019 Meeting or Teleconference Held On 8/3/2016 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 annual groundwater monitoring event to include PAHs, BTEX, GRO, DRO, RRO, full VOCs, metals, EDB and 1,2-DCA. We discussed that since RRO (30,000 mg/kg) was left at the site over the maximum allowable RRO concentration (22,000 mg/kg) that area will need confirmation soil samples in the future demonstrating it has been remediated below levels for closure with ICs. There are also areas of the site (piping/dispenser/tanks/under building) where the extent of the contamination has not been defined, that will need to be defined to evaluate the site for closure. We also discussed that additional vapor intrusion (VI) sampling will need to be conducted in frozen and non-frozen conditions with either indoor air or repaired soil gas sampling in accordance with a new approved work plan. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other September 28, 2016 groundwater sampling event. Two monitoring wells were sampled. Up to 0.567 mg/kg DRO, metals were below default cleanup levels, and non-detect for PCE, benzene, RRO, chloroform, PAHs, and MTBE in the groundwater samples collected. Benzo(a)anthracene and Dibenzo(a,h)anthracene reporting limit exceeded cleanup levels. Contamination increased in 1 of the 3 monitoring wells sampled. Depth to groundwater was 31.45 to 32.62 feet below ground surface. Groundwater flow direction was to the west. Samples were collected with bladder pump at the top of water column after monitoring wells were purged. Robert Weimer
6/28/2019 Meeting or Teleconference Held On 12/15/16 teleconference with Shells consultant (GES) to discuss future site work for site closure. We discussed that the extent of the soil and groundwater contamination needs to be characterized before a site can be considered for closure. They will submit a proposal for DEC approval regarding future groundwater monitoring. They will submit and updated PAH sampling report with method detection limits. DEC is requesting a work plan for vapor intrusion in the building. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other On 8/2/2017 DEC conditionally approves work plan to collect indoor and outdoor air samples to help assess potential exposure to subsurface vapor migration into the service station building located on the property. The work plan is approved with the modification that the outdoor air sample location be placed so it is upwind of the prevailing wind direction near the building air intake if possible. Robert Weimer
6/28/2019 Meeting or Teleconference Held On 8/8/2017 DEC meeting with Shell with Shells consultant (GES) to discuss future site work for site closure. We discussed that they will conduct indoor air sampling of the on-property building during frozen and non-frozen ground conditions. Based on the indoor air sampling evaluate the site for closure with IC's. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other On 12/11/2017 DEC review of Indoor Air Sampling report for September 28-29, 2017 non-frozen ground indoor air sampling. Five indoor air samples (including a duplicate) and one outdoor air sample (on the roof near the building air intake) were collected. The indoor air samples had up to 59.1 ug/m3 Benzene (16 ug/m3 commercial screening level), 17.9 ug/m3 Ethylbenzene (49 ug/m3 commercial screening level), 8.35 ug/m3 1,2,4-Trimethylbenzene (31 ug/m3 commercial screening level), 88.1 ug/m3 total Xylenes (440 ug/m3 commercial screening level), non-detect PCE, TCE and Naphthalene. The other detected compounds were below 10% of the screening level. The outdoor air sample had up to 1.22 ug/m3 benzene, 1.67 ug/m3 Ethylbenzene, non-detect 1,2,4-Trimethylbenzene, 5.57 ug/m3 total Xylenes, and non-detect PCE, TCE and Naphthalene. They plan to conduct indoor air sampling during frozen ground conditions in the winter of 2017. Because the indoor air sample results were above 10% of the screening levels (and exceeded the screening level for benzene in 3 of 4 indoor air sampling locations) additional non-frozen ground indoor air sampling is required. While the current use is commercial, the property is zoned for residential. Robert Weimer
6/28/2019 Meeting or Teleconference Held On 12/22/2017 teleconference with Shell with Shells consultant (GES) to discuss future site work for site closure. We discussed that they will conduct indoor air sampling of the on-property building during frozen ground conditions. We discussed the results of the September 2017 indoor air sampling that exceeded levels for benzene. Shell/GES is to contact owner/operator about the contaminants in the indoor air. Based on future indoor air sampling evaluate the site for closure. Robert Weimer
6/28/2019 Update or Other Action On 1/9/2018 Email from GES that today they had spoken with Irwin Dahlman who is the manager of the Shell station/restaurant about the indoor air concentrations and to expect a call from DEC HHS regarding the exposure to workers in the building. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other On 4/5/2018 DEC review of Indoor Air Sampling report for February 20-21, 2018 frozen ground indoor air sampling. Six indoor air samples (including a duplicate) and one outdoor air sample (nw corner of property) were collected. The indoor air samples had up to 3.26 ug/m3 Benzene (3.6 ug/m3 residential screening level and 16 ug/m3 commercial screening level), 2.1 ug/m3 Ethylbenzene (49 ug/m3 commercial screening level), non-detect 1,2,4-Trimethylbenzene (7.3 ug/m3 residential screening level and 31 ug/m3 commercial screening level), 14.36 ug/m3 total Xylenes (440 ug/m3 commercial screening level), non-detect PCE, TCE and Naphthalene. The other detected compounds were below 10% of the screening level. The outdoor air sample had up to 1.19 ug/m3 benzene, non-detect Ethylbenzene, non-detect 1,2,4-Trimethylbenzene, 2.11 ug/m3 total Xylenes, and non-detect PCE, TCE and Naphthalene. Need to conduct indoor air sampling during non-frozen ground conditions in 2018 to compare to 2017 concentrations. While the current use is commercial, the property is zoned for residential. Robert Weimer
6/28/2019 Meeting or Teleconference Held On 4/18/2018 Teleconference with Shell with Shells consultant (GES) to discuss future site work for site closure. We discussed that they will conduct indoor air sampling of the on-property building during non-frozen ground conditions. We discussed the results of the September 2017 indoor air sampling that exceeded levels for benzene and they will need another indoor air sampling event in the fall of 2018. We discussed that there were BTEX soil contamination was identified at the tank, piping, and dispenser areas near the building in 1996. GES is to provide a figure showing areas over MTGW and human health cleanup levels and a work plan for decommissioning the site monitoring wells. Robert Weimer
6/28/2019 Meeting or Teleconference Held On 8/15/2018 DEC meeting with Shell with Shells consultant (GES) to discuss future site work for site closure. We discussed that they will conduct indoor air sampling of the on-property building during non-frozen ground conditions. We discussed the results of the September 2017 indoor air sampling that exceeded levels for benzene and they will need another indoor air sampling event in the fall of 2018. GES is to provide a figure showing areas over MTGW, human health, and maximum allowable cleanup levels. Conditional approval letter for the decommissioning of the site monitoring wells is to be issued soon. They asked if they would need to analyze for full VOCs or just benzene. 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
6/28/2019 Document, Report, or Work plan Review - other On 8/31/2018 DEC approves work plan to decommission all of the remaining site monitoring wells. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other On September 25, 2018 monitoring wells MW-1, MW-2, MW-3, MW-4, and MW-5 and soil vapor probes SV-1 and SV-2 were decommissioned in accordance with the approved work plan. Prior to decommissioning all of the monitoring wells where checked for any product and none was found. Robert Weimer
6/28/2019 Document, Report, or Work plan Review - other On 2/22/2019 DEC review of Indoor Air Sampling report for September 26-27, 2018 non-frozen ground indoor air sampling. Five indoor air samples (including a duplicate) and one outdoor air sample (northwest corner of property) were collected. The indoor air samples had up to 3.34 ug/m3 Benzene (3.6 ug/m3 residential screening level and 16 ug/m3 commercial screening level), 4.86 ug/m3 Ethylbenzene (11 ug/m3 residential screening level and 49 ug/m3 commercial screening level), 4.72 ug/m3 1,2,4-Trimethylbenzene (7.3 ug/m3 residential screening level and 31 ug/m3 commercial screening level), 26.88 ug/m3 total Xylenes (100 ug/m3 residential screening level and 440 ug/m3 commercial screening level), 26.0 ug/m3 Toluene (3,800 ug/m3 residential screening level and 7,500 ug/m3 commercial screening level), non-detect PCE, TCE and Naphthalene. The other detected compounds were below 10% of the screening level. The outdoor air sample had up to 0.655 ug/m3 benzene, 3.08 ug/m3 Toluene, non-detect Ethylbenzene, non-detect 1,2,4-Trimethylbenzene, non-detect total Xylenes, and non-detect PCE, TCE and Naphthalene. While the current use is commercial, the property is zoned for residential. Robert Weimer
6/28/2019 Cleanup Complete Determination Issued Robert Weimer
6/28/2019 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 80476 name: 2000 Used Oil Tank Release Robert Weimer
6/30/2019 Leaking Underground Storage Tank Cleanup Initiated - Petroleum Administrative action addition for grant reporting purposes. Evonne Reese

Contaminant Information

Name Level Description Media Comments
Benzene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil

Control Type

Type Details
No ICs Required

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.
Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70)

There are no documents for this site report.

Hazard ID Site Name File Number
23728 Texaco #61, 1989 Release 2100.26.099
24199 Texaco #61, 1996 Release 2100.26.100
27113 Texaco #61, Floor Drain / Sand Trap 2100.38.579

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