| Action Date |
Action |
Description |
DEC Staff |
| 1/4/1993 |
Update or Other Action |
Received a copy of the HartCrowser “Work Plan for Additional Groundwater Characterization at Tudor Road Municipal Transit Maintenance Facility, Anchorage, Alaska” dated 12/28/92. The work plan proposes to install two groundwater monitoring wells along the west boundary of the MOA Facility Campus to determine whether GW contamination is reaching the west boundary of the MOA Complex. These wells are indirectly related to this site. |
Scott Bailey |
| 1/15/1998 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
A 500-gallon waste oil UST along with an oil/water separator was excavated and removed this date. |
Bill Petrik |
| 4/15/1998 |
Update or Other Action |
Received a copy of the Dames & Moore “Final Report, Oil/Water Separator and UST Removal Site Assessment, Transit Warm Storage Facility, 3650 B Tudor Road, Anchorage, Alaska” dated 2/25/98. |
Lynne Bush |
| 9/25/1998 |
Site Characterization Report Approved |
After reeview of the Dames & Moore “Final Report, Oil/Water Separator and UST Removal Site Assessment, Transit Warm Storage Facility, 3650 B Tudor Road, Anchorage, Alaska” dated 2/25/98, sent a letter to Jon Clark of the MOA this date, requested Release Investigation and Corrective Action work plans for further site characterization and corrective action work be submitted to the department for review and approval. |
Lynne Bush |
| 3/1/2011 |
Update or Other Action |
Talked with Jon Clark of the MOA indicating that the Contaminated Sites Program (CSP) regards the tank removal at this site to be a contamination issue and will be sending him a Potentially Responsible Party letter in the near future. |
Bill Petrik |
| 3/2/2011 |
Site Characterization Report Approved |
Reviewed the Dames & Moore “Final Report, Oil/Water Separator and UST Removal Site Assessment, Transit Warm Storage Facility, 3650 B Tudor Road, Anchorage, Alaska” dated 2/25/98 and re-received 2/23/11. A 500-gallon regulated fibergalss waste oil underground storage tank (UST) and associated oil/water separator (OWS) were excavated and removed on 1/15/98 as part of an upgrade to the system. MOA reported that the OWS and UST were installed in 1983 and were used to collect melt water from the mass transit busses stored in the facility. The OWS and UST were located inside the building, at the north end of the facility. The UST was located 6’ west of the OWS. The UST inflow pipe was 7’ below the facility floor. Field screening results indicated PID readings were below the detection limit in all samples taken above 6’ bgs and elevated PID readings were present in all samples taken between 6 and 12’ bgs. 50 c. y. of contaminated and “clean” soil was excavated. Excavated soil was field screened to segregate potentially "clean" from suspected "contaminated" soil and depending upon the field screening results. None of the excavated soil determined to be “clean” displayed evidence of soil contamination based on field screening or visual observation. Excavated soil considered to be contaminated displayed evidence of soil contamination when field screened. The contaminated soil was segregated and placed in a separate containment area. Dark oil staining was observed along the interface of the two concrete sections of the OWS, and evidence of soil staining and petroleum odors were observed in the excavation. Based on field observations, it appears that oil release occurred over time between the two concrete sections of the OWS. No holes were observed on the portion of the fiberglass tank not damaged during the excavation. However, due to the UST being damaged during removal, it was difficult to determine if the tank had ever leaked.
Five soil samples, including one duplicate, were submitted to a laboratory for analysis for GRO, DRO, RRO, BTEX, HVOs, PCBs, and Metals. Two were from the excavation bottom beneath the UST and the OWS at 10.5’ bgs and 12’ bgs, respectively, and the other three related to the stockpiles. GRO, DRO, RRO, toluene, ethylbenzene, total xylenes, and metals were detected. The only current 18 AAC 75 cleanup levels exceeded were for DRO from the two excavation bottom sample results and the contaminated soil stockpile and were 907 mg/kg, 3,360 mg/kg, and 2,230 mg/kg, respectively.
GW was encountered between 11 and 11.5' below the facility floor during the removals. A hydrocarbon sheen and black streaks of an oil-like substance were observed on the GW. GW samples were not collected as part of the investigation.
|
Bill Petrik |
| 3/3/2011 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST site created in CSP database for source area Tank 2302-1 - 500-Gallon Waste Oil UST, 79046 |
Mitzi Read |
| 3/3/2011 |
Site Added to Database |
A new site has been added to the database |
Mitzi Read |
| 3/3/2011 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 79046 name: Tank 2302-1 - 500-Gallon Waste Oil UST |
Mitzi Read |
| 3/4/2011 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 79046 Tank 2302-1, 500-Gallon Waste Oil UST. The initial ranking entered by Site Intake staff was reviewed and updated. The score subsequently increased from 3 to 4. |
Bill Petrik |
| 3/4/2011 |
Potentially Responsible Party/State Interest Letter |
Sent a PRP letter this date. The letter also requested submittal of a work plan to the CSP by June 1. |
Bill Petrik |
| 3/22/2011 |
Exposure Tracking Model Ranking |
Based on new information from a CSP ETM specialist, a new updated ranking with ETM has been completed for source area 79046 Tank 2302-1, 500-Gallon Waste Oil UST. The score was unchanged. |
Bill Petrik |
| 2/21/2012 |
Site Characterization Workplan Approved |
CSP Conditional Approval of October 20, 2011 dated Work Plan for Groundwater Monitoring, MOA-Transit Warm Storage Building Tank 2302-1, Anchorage, Alaska; ADEC Hazard ID: 25614.The work plan proposes to collect groundwater samples for laboratory analysis and to measure ground water quality parameters. This work plan is approved with the following conditions:
Complete copies of field notes need to be provided with the report.
Please provide three (3) working days advance notice when planning to do work, to give us an opportunity to be on site to inspect.
|
Katrina Chambon |
| 11/5/2012 |
Document, Report, or Work plan Review - other |
The S&W 2012 report noted that two groundwater samples and one duplicate were collected from existing monitoring wells, MW-6 and MW-7. MW-6 is located approximately 120 feet north-northwest and MW-7 is located approximately 700 feet northwest of the Transit Warm Storage Building’s former 500-gallon used oil UST. The samples were analyzed for gasoline range organics (GRO), diesel range organics (DRO), volatile organic compounds (VOCs), and polycyclic aromatic hydrocarbons (PAHs).
Analytical results indicate that GRO, VOCs and PAHs were not detected in the groundwater samples. DRO was detected in MW-6 and MW-7 and dichlorodifluoromethane was detected in MW-6; however, concentrations of all contaminants of concern were well below DEC’s 18 AAC 75.345 groundwater cleanup levels.
Based on a review of the report and file, the following information needs to occur before this site can be considered for closure:1. The nature and extent of soil and groundwater contamination must be adequately delineated. 2. A stable or decreasing trend in groundwater contaminant concentrations must be demonstrated. 3. A Conceptual Site Model (CSM) is required that satisfactorily demonstrates that there is no risk to human health or the environment.
4.Free product must be addressed.
While periodic groundwater monitoring has been on-going since 1993, there is inadequate information regarding the contaminant plume in the immediate proximity to the former leaking UST. For example, MW-6 is located approximately 120 feet north-northwest and MW-7 is located approximately 700 feet northwest of the Transit Warm Storage Building’s former 500-gallon used oil UST. These wells were installed prior to the removal of the UST in order to determine whether groundwater contamination from the transit maintenance complex was moving off site toward private drinking water wells. Although the sampling events show that contamination is not migrating off property, the wells are located too far from the used oil UST source area to clearly delineate the plume, i.e., all we know is that the plume has not migrated to those distances listed above. |
Katrina Chambon |
| 5/27/2015 |
Meeting or Teleconference Held |
Meeting with RP representative and consultant to determine path forward for site. Requested work plan for sampling at MW6 and MW7 and installation of another well. |
Lisa Krebs-Barsis |
| 11/29/2017 |
Site Characterization Workplan Approved |
The ADEC has reviewed the “Revised Work Plan for Monitoring Well Installation and Sampling, Transit Warm Storage Building, 3555 Dr. Martin Luter King Jr. Avenue, Anchorage, Alaska; ADEC File No. 2100.26.572”. The ADEC has no objections to the work plan pending the following: The plan dictates that field screening samples will be warmed to a common temperature and tested within 10 to 60 minutes of collection, however ADEC field sampling guidance specifies that field screening samples should be heated to a temperature of at least 40 degrees F. The ADEC has no objections to the work plan pending field screening samples adhere to ADEC field sampling guidelines. |
Chelsy Passmore |
| 11/30/2017 |
Site Characterization Workplan Approved |
The ADEC has reviewed the “Revised Work Plan for Monitoring Well Installation and Sampling, Transit Warm Storage Building, 3555 Dr. Martin Luter King Jr. Avenue, Anchorage, Alaska; ADEC File No. 2100.26.572”. The ADEC has no objections to the work plan pending the following: The plan dictates that field screening samples will be warmed to a common temperature and tested within 10 to 60 minutes of collection, however ADEC field sampling guidance specifies that field screening samples should be heated to a temperature of at least 40 degrees F. |
Chelsy Passmore |
| 4/17/2018 |
Site Characterization Report Approved |
Field activities consisted of advancing one soil boring and completing that boring as a groundwater monitoring well, as well as collecting soil and groundwater samples. Two analytical soil samples were collected and analyzed from the soil boring. Diesel range organics (DRO), and residual range organics (RRO) were detected in soil at concentrations up to 23.1 mg/kg, and 258 mg/kg respectively, below ADEC Method 2 cleanup levels of 230 mg/kg and 9700 mg/kg. Monitoring wells MW-6 and MW-7 were sampled in addition to the newly installed monitoring well SW-1. Groundwater samples did not contain contaminants above ADEC Table C cleanup levels. |
Chelsy Passmore |
