Action Date |
Action |
Description |
DEC Staff |
11/16/1999 |
Update or Other Action |
November 16, 1999 Groundwater monitoring event. Up to 0.0048 mg/l TCE and 0.017 mg/l PCE in the groundwater (monitoring well MW-2). Some lower levels of PCE was also detected in monitoring wells MW-1 and MW-3. Depth to groundwater is generally 7 to 8 feet below ground surface. Groundwater flow direction is generally to the northwest. |
Robert Weimer |
1/21/2000 |
Update or Other Action |
January 21, 2000 Groundwater monitoring event. TCE and PCE contamination was not detected in the 3 monitoring wells (MW-4, MW-5, MW-6) sampled. The monitoring wells (MW-1, MW-2, MW-3) that had previously shown TCE and PCE contamination were not sampled during this event. Depth to groundwater is 7 to 8 feet below ground surface. Groundwater flow direction is generally to the northwest. |
Robert Weimer |
3/3/2000 |
Streamlined Cleanup Program |
March 3, 2000 Groundwater monitoring event. TCE and PCE contamination was not detected in the 2 monitoring wells (MW-7, MW-8) sampled. Monitoring well MW-7 is located off property to the south by southwest of the site. Monitoring well MW-8 is located off property to the south by southeast of the site. The monitoring wells (MW-1, MW-2, MW-3) that had previously shown TCE and PCE contamination were not sampled during this event. Depth to groundwater is 7 to 8 feet below ground surface. Groundwater flow direction is generally to the northwest. |
Robert Weimer |
4/26/2000 |
Document, Report, or Work plan Review - other |
Two drinking water wells (4432 Wright Street and 4424 Wright Street) located just to the south of the site were sampled on 4/26/00 and 4/3/00 respectively. They were both non-detect (<.0005 mg/l) for volatile organic compounds (which includes benzene, PCE, and TCE) by method 524.2. They were not able to sample a third drinking water well located at 4430 Wright Street. |
Robert Weimer |
7/30/2001 |
Update or Other Action |
July 30, 2001 Groundwater monitoring event. Up to 0.008 mg/l TCE (0.005 mg/l cleanup level) and 0.062 mg/l PCE (0.005 mg/l cleanup level) in the groundwater (monitoring well MW-2). The contamination concentrations have increased in MW-2 since the previous sampling event (1999). Depth to groundwater is 7 to 8 feet below ground surface. Groundwater flow direction is to the northwest. |
Robert Weimer |
1/29/2002 |
Update or Other Action |
January 29, 2002 Groundwater monitoring event. TCE and PCE contamination was not detected in the 1 monitoring well (MW-VSC) sampled. The monitoring wells (MW-1, MW-2, MW-3) that had previously shown TCE and PCE contamination were not sampled during this event. Depth to groundwater is 7 to 8 feet below ground surface. Groundwater flow direction is generally to the northwest. |
Robert Weimer |
1/29/2002 |
Document, Report, or Work plan Review - other |
Three drinking water wells (4432 Wright Street, 4430 Wright Street, and 4424 Wright Street) located just to the south of the site were sampled on 1/29/02. They were all non-detect (<.0005 mg/l) for volatile organic compounds (which includes benzene, PCE, and TCE) by method 524.2. |
Robert Weimer |
5/30/2005 |
Update or Other Action |
A three foot diameter dewatering well was installed to a depth of 16 feet below ground surface (bgs) approximately 18 feet south of monitoring well MW-2. This well was centered in the former laudromat building footprint. At 8 feet bgs 0.125 mg/kg (0.024 mg/kg cleanup level) Tetrachloroethylene (PCE) and 1.2 mg/kg (0.02 mg/kg cleanup level) Trichlorethylene (TCE) found in soils. At 16 feet below ground surface 0.036 mg/kg PCE and 0.125 mg/kg TCE in soils. Groundwater was encountered at 12 feet bgs. Because of this contamination the dewatering well was not used and it was decommissioned on June 10, 2005. |
Robert Weimer |
6/27/2005 |
Update or Other Action |
A No Further Action letter is issued by ADEC for the Tesoro - Northstore #56 site (file number 2100.26.088) regarding the petroleum contamination identified during facility upgrade activities for the underground storage tank system in 1998. During the site investigation work for the Tesoro - Northstore #56 site solvent contamination was identified that appears to be related the former dry cleaner or garage on the property. |
Robert Weimer |
3/24/2006 |
Site Ranked Using the AHRM |
Site ranked using the AHRM. |
Alyce Hughey |
3/24/2006 |
Update or Other Action |
File number 2100.38.467 assigned and entered into the Fileroom Database and Contaminated Sites database. |
Alyce Hughey |
3/24/2006 |
GIS Position Updated |
Using Figure 1 from a Site Investigation/De-Watering Well Installation Tesoro 2 Go Mart #56, in conjunction with TopoZone Pro and the Anchorage Borough, entered the coordinates for this site. Metadata includes No Topo Basemap, TopoZone Pro Street Maps, Black and White Aerial Photo, on a Medium Size Map, View Scale 1:10,000, Coordinate Datum NAD83. High degree of confidence in accuracy of location. |
Alyce Hughey |
3/24/2006 |
Site Added to Database |
Site added to the database. |
Alyce Hughey |
2/27/2008 |
Update or Other Action |
Talked with real estate agent for the property owners. We discussed the site history and probable work needed to be done on the site. We discussed that the latest site data (from 2005) shows soil and groundwater contamination remaining above site cleanup levels. He said that he would talk to the property owners about hiring a consultant to collect groundwater samples to assess the current contamination levels in the groundwater. |
Robert Weimer |
6/10/2008 |
Exposure Tracking Model Ranking |
Site ranked on the new Exposure Tracking Model (ETM). The ETM is a new site ranking system that looks at, based on available data, the potential exposure pathways for the contamination remaining at the site. |
Robert Weimer |
4/6/2009 |
Document, Report, or Work plan Review - other |
Three soil borings were drilled and sampled on February 12, 2009 near the current gasoline underground storage tanks located on the north end of the Tesoro #56 property to help investigate the new gasoline release discovered on 2/4/09. The soil boring were drilled to 13 to 14 feet below ground surface. Up to 0.0921 mg/kg benzene (0.025 mg/kg cleanup level), 87.9 mg/kg GRO (300 mg/kg cleanup level), <0.0628 mg/kg TCE (0.02 mg/kg cleanup level), and 0.241 PCE (0.024 mg/kg cleanup level) were found at the locations and depths sampled. One of the borings to the east of the tanks (located cross gradient to the contamination) was completed as a monitoring well (MW-09-1) and the groundwater sample collected from that monitoring well was non detect for BTEX, GRO, TCE, and PCE. |
Robert Weimer |
8/21/2009 |
Site Characterization Report Approved |
A new Tesoro Northstore #56 - 2009 site (file number 2100.26.562) was identified during the removal of two gasoline underground storage tanks (UST’s), dispenser islands and associated piping on the property on August 17 through August 21, 2009. Approximately 112.7 tons of hazardous solvent and petroleum contaminated soil was transported off-site for treatment/disposal to Tacoma, Washington. The soil samples taken from the bottom and side walls of the UST’s excavation did not detect any of the contaminants of concern above the soil cleanup levels. The soil samples taken from the dispenser islands and associated piping excavations detected Benzene at 0.0604 mg/kg and GRO at 1,159 mg/kg at 6 feet below ground surface under dispenser #2. The groundwater sample taken from the groundwater depression in the UST excavation pit did not detect GRO or BTEX above the groundwater cleanup levels. The extent of groundwater contamination related to the dispenser island contamination is unknown at this time. The recommendation that a release investigation be performed in the fall of 2009, including the advancement of five soil borings constructed into monitoring wells to further characterize the extent of residual contamination at this site and the possible impact on the groundwater. |
Robert Weimer |
5/26/2011 |
Update or Other Action |
Updated lat/long data to show correct location. |
Robert Weimer |
6/22/2011 |
Site Characterization Report Approved |
February 10, 2011 groundwater monitoring event conducted by Tesoro's consultant. Five monitoring wells were sampled, up to <0.005 mg/l benzene, 0.00216 mg/l xylenes, and 0.146 mg/l GRO in the groundwater, an increase in one of the five monitoring wells. Analysis was not conducted for solvents (PCE and TCE) during this monitoring event. The depth to groundwater ranged from 7.93 to 8.56 feet below ground surface. The groundwater flow direction was toward the southwest, historically the groundwater flow direction has ranged from north by northwest to southwest. One monitoring well is located in the former tank excavation, and the other four monitoring wells are located near the former dispenser island. |
Robert Weimer |
7/28/2011 |
Site Characterization Report Approved |
On July, 2011 Tesoro excavated soil near the former dispenser area that previously had gasoline contamination. Confirmation soil samples were collected between 7.5 and 11 feet below ground surface. All excavation and stockpile samples were non-detect for solvents, and met cleanup levels for BTEX and GRO. Groundwater was encountered at 9 feet below ground surface in that area. |
Robert Weimer |
10/20/2011 |
Update or Other Action |
A Corrective Action Complete Determination letter was issued to Tesoro for the 2009 fuel release. See file 2100.26.562. |
Robert Weimer |
2/13/2012 |
Update or Other Action |
The remaining four monitoring wells, MW-1 through MW-4, that were installed by Tesoro as part of their release investigation for fuel contamination they cleaned up were decommissioned by Tesoro on August 24, 2011. See file 2100.26.562. |
Robert Weimer |
1/30/2014 |
Update or Other Action |
Project manager changed to Amy Dieffenbacher, file transferred to Juneau |
Amy Rodman |
6/23/2014 |
Potentially Responsible Party/State Interest Letter |
Mailed PRP Notification Letter to RP. |
Amy Rodman |
9/29/2015 |
Update or Other Action |
Letter sent on this day requesting a site characterization work plan by February 1, 2016. |
Joshua Barsis |
11/30/2015 |
Potentially Responsible Party/State Interest Letter |
Multiple PRP letter sent. |
Joshua Barsis |
11/30/2015 |
Update or Other Action |
Request for further delineation and/or characterization mailed to multiple PRPs. |
Joshua Barsis |
2/23/2016 |
Update or Other Action |
Letter sent on this day to multiple responsible parties and their representatives. |
Joshua Barsis |
8/26/2016 |
Update or Other Action |
Work plan requested by October 1, 2016 via letter. |
Joshua Barsis |
2/20/2018 |
Update or Other Action |
Compliance letter sent on this day. Work plan requested by May 1, 2018. |
Joshua Barsis |
9/7/2018 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 75187 Contamination found in 1999. |
Joshua Barsis |
3/14/2024 |
Workplan Requested |
Work plan requested by June 1, 2024, via letter. The extent of the solvent contamination needs to be defined and monitored. |
Stacee Henderson |
5/30/2024 |
Update or Other Action |
Approval for 90 day extension on this date. The work plan is due by Aug. 30, 2024. |
Stacee Henderson |
8/23/2024 |
Update or Other Action |
Approval for 30 day extension on this date. The work plan is due by Sept. 30, 2024. |
Stacee Henderson |
9/30/2024 |
Update or Other Action |
Approval for 30 day extension on this date. The work plan is due by Oct. 30, 2024. |
Stacee Henderson |
10/30/2024 |
Update or Other Action |
Approval for 30 day extension on this date. The work plan is due by Nov. 29, 2024. |
Stacee Henderson |