| Action Date |
Action |
Description |
DEC Staff |
| 10/21/1998 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST Site created in CSP for source area ID 77632 (Added by System) |
Robert Weimer |
| 10/21/1998 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
|
Former Staff |
| 10/21/1998 |
Site Added to Database |
|
Former Staff |
| 2/11/1999 |
Underground Storage Tank Site Characterization or Assessment |
Site assessment identified piping soil contamination up to 1.4 ppm benzene at groundwater interface. Groundwater found at 6 feet. 50 cubic yards of contaminated soil stockpiled on north side of site. |
Robert Weimer |
| 5/10/1999 |
Update or Other Action |
ADEC letter requesting information, a release investigation, and a corrective action plan. |
Robert Weimer |
| 8/7/2001 |
Update or Other Action |
ADEC letter again requesting everything requested by ADEC in May 10, 1999. None submitted to date. |
Robert Weimer |
| 5/15/2002 |
Meeting or Teleconference Held |
Talked with current owner/RP Tom Snelling. He said Dames & Moore did a release investigation which included installing, 4 borings, including 2 monitoring wells. He will forward a copy of the report. |
Robert Weimer |
| 3/8/2004 |
Document, Report, or Work plan Review - other |
Received December 19, 1990 Phase II report and January 23, 1991 Environmental Property Report. Monitoring well in the southeast corner of the USTs identified higher field readings from 6 to 16 ft below ground surface but no analytical samples collected at those depths. Soil sample collected a 20 ft in that boring had .04 ppm benzene and 24 ppm TPH. The two monitoring wells did not show any water contamination but may be biased low because the wells were screened from 10 to 25 ft below ground surface with groundwater at 5.5 to 6 below ground surface. |
Robert Weimer |
| 4/23/2004 |
Update or Other Action |
Approved April 20, 2004 groundwater sampling workplan. |
Robert Weimer |
| 5/18/2004 |
Leaking Underground Storage Tank Corrective Action Underway |
Approved stockpile treatment workplan |
Robert Weimer |
| 5/27/2004 |
Meeting or Teleconference Held |
Meeting to discuss further site work. Need additional monitoring well to define the extent of the groundwater contamination to the northwest. |
Robert Weimer |
| 10/4/2004 |
Document, Report, or Work plan Review - other |
Three monitoring wells installed in May 2004. One additional monitoring well installed in June 2004. Soil sampling found up to .07 mg/kg benzene. Groundwater sampling found up to 3.4 mg/l DRO and 81.4 ug/l benzene. Soil stockpile samples found up to 1360 mg/kg DRO. |
Robert Weimer |
| 12/13/2004 |
Document, Report, or Work plan Review - other |
September 20, 2004 groundwater sampling event. Up to 17.8 mg/l GRO, 1.91 mg/l DRO, and 359 ug/l benzene in the groundwater. Contamination levels appear to be increasing. |
Robert Weimer |
| 9/2/2005 |
Document, Report, or Work plan Review - other |
July 18, 2005 groundwater sampling event. Up to 12.8 mg/l GRO, 1.64 mg/l DRO, and 245 ug/l benzene in the groundwater. Contamination levels appear to be stable. Groundwater flow direction is to the north by northwest. |
Robert Weimer |
| 7/25/2006 |
Update or Other Action |
File number issued 2100.26.274 (FKA L55.331). |
Aggie Blandford |
| 8/8/2006 |
Document, Report, or Work plan Review - other |
April 28, 2006 groundwater sampling event. Up to 1.15 mg/l GRO, 1.36 mg/l DRO, and 84.4 ug/l benzene in the groundwater. Contamination levels appear to be decreasing, but this may be due to a seasonal fluctuation. Groundwater flow direction is to the north by northwest. Depth to groundwater is 2.8 to 5.7 feet below ground surface. Need a monitoring event in the fall of 2006. |
Robert Weimer |
| 1/11/2007 |
Document, Report, or Work plan Review - other |
September 28, 2006 groundwater sampling event. Up to 1.41 mg/l GRO, 5.95 mg/l DRO, 7.26 mg/l RRO, and 224 ug/l benzene in the groundwater. Contamination levels appear to be increasing, but this may be due to a seasonal fluctuation. Groundwater flow direction is to the north by northeast. Depth to groundwater is 1.7 to 4.9 feet below ground surface. Need a monitoring event in the fall of 2006. |
Robert Weimer |
| 1/11/2007 |
Document, Report, or Work plan Review - other |
A Human Health Conceptual Site Model was provided for this site. |
Robert Weimer |
| 2/14/2007 |
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 |
| 6/15/2007 |
Site Visit |
Site visit to observe tank removal and site assessment at Hanna Car Wash on Dimond. Meeting at the site to discuss future site work. |
Robert Weimer |
| 8/15/2007 |
Offsite Soil or Groundwater Disposal Approved |
ADEC approves transport of 50 cubic yards of contaminated soil for thermal treatment, and 370 cubic yards of contaminated soil to the Anchorage Regional Landfill for disposal. |
Robert Weimer |
| 8/24/2007 |
Update or Other Action |
ADEC approves reuse of 5 stockpiles (SP5-5, SP16-2, SP17-3, SP8-2, and SP9-2) on site. They total approximately 250 cubic yards. Sampling results show that these soils meet default cleanup levels. |
Robert Weimer |
| 11/7/2007 |
Document, Report, or Work plan Review - other |
April 6, 2007 groundwater sampling event. Up to 0.32 mg/l GRO, 0.749 mg/l DRO, 0.635 mg/l RRO, and 47.4 ug/l benzene in the groundwater. Contamination levels appear to be decreasing, but this may be due to a seasonal fluctuation. Groundwater flow direction is to the north by northeast. Depth to groundwater is 6.26 to 6.72 feet below ground surface. |
Robert Weimer |
| 11/13/2007 |
Meeting or Teleconference Held |
Discussed site with RP's consultant. Based on the data provided to date, this site appears to be a candidate for site closure for the northern portion and possibly conditional closure for the southern (UST, up to 0.514 benzene mg/kg remains in the soil, and 47.4 ug/l benzene remains in the shallow groundwater) portion. They will complete the site report and submit the final data for review. |
Robert Weimer |
| 11/21/2007 |
Offsite Soil or Groundwater Disposal Approved |
ADEC receives documentation that 155.73 tons of contaminated soil was transported to ASR for thermal treatment, and 203.85 tons of contaminated soils to the Anchorage Regional Landfill for disposal. No contaminated stockpiles remain at the 2201 West Dimond Blvd. site. |
Robert Weimer |
| 7/17/2008 |
Meeting or Teleconference Held |
Talked with RP's consultant. The RP will need to submit a work plan for placing replacement monitoring wells. Soil sampling may also be required from the drilling of the monitoring wells. |
Robert Weimer |
| 11/21/2008 |
Document, Report, or Work plan Review - other |
Review proposed release investigation workplan. The plan proposes to install two monitoring wells and to collect soil and groundwater samples at those locations. Discussed workplan with RPs consultant. ADEC requests a minimum of 4 monitoring wells (south of excavation, EX2-5, just northwest of EX-6, and near the former MW-3). Based on the results ADEC may require additional work to define the extent of the soil and groundwater contamination. RPs consultant will be submitting a revised workplan. |
Robert Weimer |
| 7/20/2009 |
Document, Report, or Work plan Review - other |
ADEC approves plan to dispose of 6 drums of contaminated drill cuttings at the Anchorage Regional Landfill. The drill cuttings were generated during the installation of four monitoring wells on 2/18/09. |
Robert Weimer |
| 10/12/2009 |
Offsite Soil or Groundwater Disposal Approved |
ADEC approves updated plan to thermally treat 6 drums of contaminated drill cuttings at ASR. They had originally proposed to dispose of the soils at the Anchorage Regional Landfill. The drill cuttings were generated during the installation of four monitoring wells on 2/18/09. |
Robert Weimer |
| 11/12/2009 |
Document, Report, or Work plan Review - other |
On February 18, 2009 four replacement monitoring wells (MW5, MW6, MW7, and MW8) were installed at the site. Depth to groundwater 9.41 to 15.90 feet below ground surface. Groundwater flow direction was to the southeast. Up to 4.27 mg/l DRO, 1.75 mg/l RRO, 1,190 ug/l benzene, and 44.1 mg/l GRO in the groundwater. Up to non-detect(<25.3 mg/kg) DRO, non-detect(<63.1 mg/kg) RRO, 1.09 mg/kg benzene, and 58.1 mg/kg GRO in the soil samples collected from the monitoring well borings. |
Robert Weimer |
| 3/17/2010 |
Document, Report, or Work plan Review - other |
November 13, 2009 groundwater sampling event. Up to 0.553 mg/l GRO, 0.54 mg/l DRO, non-detect(<0.385 mg/l) RRO, and 46.2 ug/l benzene in the groundwater. Contaminant concentrations increased in 1 of the 4 monitoring wells sampled, but this may be due to a seasonal fluctuation. Groundwater flow direction was not determined this monitoring event. Two well caps were missing and need to be repaired. Depth to groundwater is 4.53 to 5.53 feet below ground surface. |
Robert Weimer |
| 3/17/2010 |
Update or Other Action |
DEC requests that all 4 monitoring well be sampled in the Spring of 2010. DEC also requests that monitoring well MW-7 be sampled for PAH’s, MTBE, EDB, and 1,2-DCA for the next groundwater monitoring event. DEC also requests that bailers or peristaltic pumps no be used for collecting volatile groundwater samples, and that the consultant provide information on how the groundwater samples are to be collected at this site. |
Robert Weimer |
| 5/10/2010 |
Document, Report, or Work plan Review - other |
ADEC approves groundwater sampling plan that a bladder pump will be used to collect groundwater samples at this site. |
Robert Weimer |
| 8/19/2010 |
Document, Report, or Work plan Review - other |
June 10, 2010 groundwater sampling event. Up to non-detect(<0.05 mg/l) GRO, 1.31 mg/l DRO, 0.441 mg/l RRO, and 3.93 ug/l benzene in the groundwater. Monitoring well MW-7 was sampled for PAH, EDB, and 1,2-DCA, all were below cleanup levels. Contaminant concentrations increased in 1 of the 4 monitoring wells sampled, but this may be due to a seasonal fluctuation in groundwater flow direction. During the spring 2009 monitoring event the groundwater flow was to the southeast and concentrations were much higher up to 4.27 mg/l DRO, non-detect (<2.50 mg/l) 1.75 mg/l RRO, 1,190 ug/l benzene, and 44.1 mg/l GRO in the groundwater. Groundwater flow direction was to the northwest. Two well caps were missing were repaired. Depth to groundwater was 3.71 to 4.63 feet below ground surface. A bladder pump was used to collect groundwater samples this monitoring event. |
Robert Weimer |
| 8/19/2010 |
Update or Other Action |
In the July 2010 Groundwater Monitoring Report it recommended that ADEC review this site for cleanup complete status, and whether the site monitoring wells could be abandoned. Seasonally it appears that the groundwater depth and flow direction (February to the southeast and June to the northwest)varies significantly. The most recent groundwater monitoring event (June 2010) is the only monitoring event where the groundwater has met cleanup levels in all of the site monitoring wells. Based on a review of the last three monitoring events contamination exceeded cleanup levels in February and November but not in June. Not enough seasonal groundwater data has been collected to demonstrate that the groundwater meets cleanup levels year round. Need additional groundwater monitoring at this site. |
Robert Weimer |
| 1/10/2011 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 77632 1998 tank upgrade based on current soil and groundwater data. |
Robert Weimer |
| 10/28/2011 |
Update or Other Action |
Not enough seasonal groundwater data has been collected to demonstrate that the groundwater meets cleanup levels year round. Need additional groundwater monitoring at this site. |
Robert Weimer |
| 1/23/2012 |
Document, Report, or Work plan Review - other |
November 17, 2010 groundwater sampling event. Up to 0.180 mg/l GRO, 0.438 mg/l DRO, non-detect(<0.438 mg/l) RRO, and 29.5 ug/l benzene (5 ug/l cleanup level) in the groundwater. Monitoring well MW-7 was sampled for PAH, EDB, MTBE, and 1,2-DCA, all were below cleanup levels. Contaminant concentrations increased in 1 of the 4 monitoring wells sampled, but this may be due to a seasonal fluctuation in groundwater flow direction. During the spring 2009 monitoring event the groundwater flow was to the southeast and concentrations were much higher up to 4.27 mg/l DRO, 1.75 mg/l RRO, 1,190 ug/l benzene, and 44.1 mg/l GRO in the groundwater. There has not been a spring sample event since 2009 to check trends. Groundwater flow direction was to the northwest this monitoring event. Depth to groundwater was 4.78 to 5.34 feet below ground surface. A bladder pump was used to collect groundwater samples this monitoring event. |
Robert Weimer |
| 1/23/2012 |
Update or Other Action |
In the November 2010 Groundwater Monitoring Report it recommended that three site monitoring wells (MW5, MW6, and MW8) be abandoned and that monitoring well 7 be sampled for DRO, GRO, and BTEX. Seasonally it appears that the groundwater depth and flow direction (February to the southeast and June/November to the northwest) varies significantly. The most recent groundwater monitoring event (November 2010) the groundwater exceeded cleanup levels in monitoring well MW7. Based on a review of the last four monitoring events contamination exceeded cleanup levels in February and November but not in June. Not enough seasonal groundwater data has been collected to demonstrate that the groundwater meets cleanup levels year round. Need additional groundwater monitoring at this site including a spring event. |
Robert Weimer |
| 1/31/2012 |
Update or Other Action |
DEC approves reducing sampling to only sampling monitoring well MW6 for BTEX, MW7 for BTEX, GRO, DRO, and suspending laboratory sampling of MW5 and MW8. Based on the results of the February 2012 sampling we can evaluate further reductions in sampling and/or decommissioning of specific monitoring wells. The RP's consultant confirmed that there had been no groundwater monitoring conducted in 2011, but they are planning to sample in February 2012. |
Robert Weimer |
| 11/6/2012 |
Document, Report, or Work plan Review - other |
February 3, 2012 groundwater sampling event. Up to 6.61 mg/l GRO (2.2 mg/l cleanup level), 2.55 mg/l DRO (1.5 mg/l cleanup level), and 230 ug/l benzene (5 ug/l cleanup level) in the groundwater. These are the highest concentrations since 2/18/2009. Contaminant concentrations increased in 2 of the 2 monitoring wells sampled. Groundwater flow direction was to the northwest this monitoring event. Depth to groundwater was 7.23 to 10.90 feet below ground surface. A bladder pump was used to collect groundwater samples this monitoring event. |
Robert Weimer |
| 11/6/2012 |
Update or Other Action |
DEC requests semi-annual sampling of monitoring wells MW6 and MW7 for BTEX, GRO, DRO during the spring and fall. Because of the increasing contaminant concentrations in monitoring well MW7 DEC is requesting continued sampling in the downgradient monitoring well MW6.
If it has not already been conducted, DEC requests that a second monitoring event be conducted in 2012.
DEC also requests that monitoring well MW-8 remain so depth to groundwater can be measured in that well so groundwater flow direction can be determined for each monitoring event. Monitoring well MW-5 is approved to be decommissioned in accordance with the current DEC monitoring well guidance.
|
Robert Weimer |
| 2/28/2013 |
Update or Other Action |
Based on past groundwater data the results appear significantly higher in the early spring monitoring event. DEC will need another early spring monitoring event to evaluate this site for closure. DEC is requesting that just MW-7 be sampled (for BTEX, GRO, and DRO). DEC is also requesting that the sampling be conducted by March 21, 2013 if possible so we can capture an early spring event. |
Robert Weimer |
| 2/28/2013 |
Document, Report, or Work plan Review - other |
November 8, 2012 groundwater sampling event. Up to non-detect(<0.1 mg/l) GRO (2.2 mg/l cleanup level), 0.922 mg/l DRO (1.5 mg/l cleanup level), and 6.64 ug/l benzene (5 ug/l cleanup level) in the groundwater. Contaminant concentrations increased in 0 of the 2 monitoring wells sampled. Groundwater flow direction was to the north by northwest this monitoring event. Depth to groundwater was 4.80 to 6.30 feet below ground surface. A bladder pump was used to collect groundwater samples this monitoring event after the monitoring wells were purged. |
Robert Weimer |
| 3/5/2013 |
Site Visit |
Site visit to observe groundwater sampling. Monitoring well MW-7 had 4 to 6 inches of a dark brown DNAPL coating the bottom section of the water interface probe. That monitoring well was then purged and the purge water had a dark dissolved coffee color. They were going to test the water for VOCs, GRO, DRO, RRO, and PAHs to help identify what the DNAPL is. The water interface probe did not have visible product coating it from any of the other monitoring wells. |
Robert Weimer |
| 4/12/2013 |
Site Visit |
Site visit to observe current site conditions. |
Robert Weimer |
| 1/21/2014 |
Document, Report, or Work plan Review - other |
March 5, 2013 groundwater sampling event. Up to 9.53 mg/l GRO (2.2 mg/l cleanup level), 3.54 mg/l DRO (1.5 mg/l cleanup level), 1.87 mg/l RRO (1.1 mg/l cleanup level), 601 ug/l benzene (5 ug/l cleanup level), solvents 2.8 ug/l TCE (5 ug/l cleanup level), 5.64 ug/l TCE (5 ug/l cleanup level), 2.93 ug/l vinyl chloride (2 ug/l cleanup level), and PAHs 2.08 ug/l benzo(a)anthracene (1.2 ug/l cleanup level), 1.1 ug/l benzo(a)pyrene (0.2 ug/l cleanup level), 1.78 ug/l benzo(b)fluoranthene (1.2 ug/l cleanup level) in the groundwater. Contaminant concentrations increased in the one monitoring well sampled (MW-7). Groundwater flow direction was to the north by northwest this monitoring event. Depth to groundwater was 9.3 to 10.7 feet below ground surface. A bladder pump was used to collect groundwater samples this monitoring event after the monitoring wells were purged. A DNAPL product was observed in the bottom of the monitoring well (MW-7). |
Robert Weimer |
| 12/8/2015 |
Update or Other Action |
ADEC letter requests that monitoring wells MW-6, MW-7, and MW-8 have depth to water measurements (to calculate groundwater flow direction), and measurements of the thickness of any product at the top and bottom in each monitoring well. ADEC also requests that monitoring wells MW-6 and MW-7 have groundwater samples collected and analyzed for VOCs (method 8260), GRO, DRO, and RRO, with the results of the sampling submitted in a report by March 1, 2016.
After a review of the results of the requested groundwater monitoring, the ADEC will determine what additional monitoring, assessment, and/or product recovery will be required at this site. |
Robert Weimer |
| 1/5/2016 |
Update or Other Action |
ADEC requested an updated work plan for conducting the requested groundwater monitoring. |
Robert Weimer |
| 3/8/2016 |
Document, Report, or Work plan Review - other |
DEC review and approval of the January 28, 2016 monitoring well sampling work plan. The work plan proposes to check for DNAPL and LNAPL product and depth to groundwater in monitoring wells MW-6, MW-7, and MW-8, and collect groundwater samples for GRO, DRO, RRO, and VOCs in monitoring wells MW-6 and MW-7. |
Robert Weimer |
| 5/5/2016 |
Update or Other Action |
Update from consultant that they completed a the groundwater event yesterday and encountered some DNAL in monitoring well MW-7. |
Robert Weimer |
| 7/27/2016 |
Offsite Soil or Groundwater Disposal Approved |
DEC approves treatment and disposal of 80 gallons of decontamination/purge water at NRC. The water was generated during monitoring well sampling from November 2010 through May 2016. |
Robert Weimer |
| 2/24/2017 |
Document, Report, or Work plan Review - other |
May 4, 2016 groundwater sampling event. Monitoring wells MW-6 and MW-7 were sampled this event. Up to 1 ug/l benzene, 0.683 mg/l RRO, and non-detect GRO, DRO, VOCs, and 1,2,4 Trimethylbenzene in the samples collected. Groundwater flow direction was to east this monitoring event. Depth to groundwater was 3.98 to 4.36 feet below ground surface. A bladder pump was used to collect groundwater samples from the top foot of the water column this monitoring event after the monitoring wells were purged. A DNAPL product was observed in the bottom of the monitoring well (MW-7). |
Robert Weimer |
| 2/24/2017 |
Update or Other Action |
ADEC letter requests that monitoring wells MW-6, MW-7, and MW-8 have depth to water measurements (to calculate groundwater flow direction), and measurements of the thickness of any product at the top and bottom in each monitoring well. ADEC also requests that monitoring wells MW-6 and MW-7 have groundwater samples collected in March 2017 and analyzed for VOCs (method 8260), PAHs (method 8270), GRO, DRO, and RRO, with the results of the sampling submitted in a report by June 1, 2017. After a review of the results of the requested groundwater monitoring, the ADEC will determine what additional monitoring, assessment, and/or product recovery will be required at this site. |
Robert Weimer |
| 7/24/2017 |
Document, Report, or Work plan Review - other |
March 23, 2017 groundwater sampling event. Monitoring wells MW-6 and MW-7 were sampled this event. Concentrations increased in 2 of 2 monitoring wells sampled during this event. Up to 254 ug/l benzene, 605 ug/l RRO, 2,550 ug/l GRO, 1,320 ug/l DRO, 313 ug/l Ethylbenzene, 829 ug/l Total Xylenes, 72.8 ug/l 1,2,4- Trimethylbenzene, 11.2 ug/l Naphthalene, 2.76 ug/l Vinyl Chloride, 9.79 ug/l Napthalene, 0.807 ug/l Benzo(a)Anthracene, 0.269 ug/l Benzo[a]pyrene 0.374 ug/l Benzo[b]fluoranthene, 2.76 ug/l Trichloroethene. Other PAH's and VOC's were detected but below cleanup levels in the samples collected. Groundwater flow direction was to North this monitoring event. Depth to groundwater was 9.62 to 11.45 feet below ground surface. A bladder pump was used to collect groundwater samples from the top foot of the water column this monitoring event after the monitoring wells were purged. 8 inches of DNAPL product was observed in the bottom of the monitoring well (MW-7). |
Robert Weimer |
| 12/31/2018 |
Update or Other Action |
On December 31, 2018 ADEC requested update on site work and reports for this site. |
Robert Weimer |
| 4/3/2020 |
Document, Report, or Work plan Review - other |
Have not received the December 31, 2018 ADEC requested update on site work and reports for this site. Need follow up with RP/consultant (BGES at 644-2900) for the submittal of any site work since the March 23, 2017 groundwater monitoring. After review of any other work conducted need letter requesting further DNAPL product measurement/recovery and groundwater monitoring. May need further release investigation and corrective action for the remaining contamination. |
Robert Weimer |
| 5/4/2020 |
Update or Other Action |
Letter drafted and sent to RP requesting groundwater monitoring for GRO, BTEX, VOCs, and PAHs be resumed, and that additional investigation may be necessary in the future to determine source(s) of TCE and vinyl chloride. Quarterly product (DNAPL) gauging to assess seasonal patterns also requested for 2020. |
Jim Fish |
| 7/8/2020 |
Update or Other Action |
Received workplan for onsite monitoring well observations and sampling |
Jim Fish |
| 7/10/2020 |
Document, Report, or Work plan Review - other |
Work plan approved for onsite monitoring well observations and sampling/analyses for GRO, VOCs, and PAHs. |
Jim Fish |
| 2/24/2021 |
Site Characterization Workplan Approved |
The ADEC approved a work plan amendment submitted by BGES, Inc on February 24, 2021. |
Randy Guintu |
| 12/26/2023 |
Site Characterization Report Approved |
The CSP reviewed Groundwater Monitoring Report (2020-2022),” dated December 2022, and submitted to the department by BGES. The report documents quarterly free product and water level monitoring, monitoring well repair to MW-6 and MW-8, decommissioning and reinstalling MW-7, and groundwater monitoring sampling for MW-6, MW-7, and MW-8. No analytes were detected in MW-6, MW-7, and MW-8. BGES recommended reducing the groundwater sampling to MW-7 on an annual basis. The CSP is requesting an updated work plan be submitted to the department for review. |
Alena Voigt |
