Site Report: East Addition Subdivision Block 20 Alley
| Site Name: | East Addition Subdivision Block 20 Alley |
|---|---|
| Address: | Alley between Cordova and Denali Streets, between 5th and 6th Avenues, East Addition Subdivision, Block 20, Anchorage, AK 99501 |
| File Number: | 2100.38.552 |
| Hazard ID: | 26360 |
| Status: | Non-Qualifying |
| Staff: | No Longer Assigned, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 61.217056 |
| Longitude: | -149.878744 |
| Horizontal Datum: | WGS84 |
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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
Tetrachloroethylene was detected in soil gas along the alley between 300 East 5th Avenue and 555 Cordova Street. Alaska Cleaners is located along the north side of the alley and a sewer line runs the length of the alley between Cordova Street and Denali Street.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 3/17/2015 | Site Added to Database | A new site has been added to the database | Mitzi Read |
| 3/20/2015 | Update or Other Action | PCE contamination was first noted in indoor air at the 555 Cordova Street office building, resulting in the installation and operation of a sub-slab depressurization system. Indoor air was also sampled at the Alaska Cleaners Building, but no contaminants were detected above DEC vapors intrusion screening levels. | Bill O'Connell |
| 3/20/2015 | Exposure Tracking Model Ranking | Initial ranking with ETM completed for source area id: 79744 name: East Addition Subdivision Block 20 Alley | Bill O'Connell |
| 1/6/2016 | Meeting or Teleconference Held | Meeting today with Anchorage Water and Wastewater Utility to discuss condition of sewer line located on Block 20 alley | Bill O'Connell |
| 5/18/2016 | Document, Report, or Work plan Review - other | Reviewed work plan for soil gas investigation, East Addition Subdivision, Block 20. Passive soil gas samplers will be deployed at 14 locations near the intersection of 5th Ave and Cordova St to evaluate the extent of soil gas impacts and provide information to support future investigation in the area. | Bill O'Connell |
| 9/19/2016 | Document, Report, or Work plan Review - other | Reviewed Report for East Addition Block 20 Alley Soil Gas Investigation. Passive soil gas samplers were deployed at 14 locations in the vicinity of Cordova St and 5th Ave in Anchorage. PCE was detected in 10 of the samples ranging from 0.03 ug/m3 to 4.24 ug/m3. The highest concentration was detected along the south side of Cordova St near Office Depot. None of the detected concentrations exceeded ADEC screening levels for the vapor intrusion pathway. | Bill O'Connell |
| 6/12/2017 | Document, Report, or Work plan Review - other | Reviewed Indoor Air Sampling Report for 555 Cordova. Passive samplers were deployed in the basement and on floors 1-5. None of the samples exceeded the target level of 41 ug/m3 for PCE, except one sample in the basement that contained PCE at 330 ug/m3. The system was apparently operating at reduced efficiency immediately preceding the sampling effort and once the system was optimized, follow up samples from the same area contained PCE at 5.2 ug/m3 | Bill O'Connell |
| 2/25/2019 | Document, Report, or Work plan Review - other | Reviewed 2019 Subslab Depressurization System Inspection and Analysis Report for 555 Cordova Street. The system inspection indicates the system is operating as designed and no adverse impacts to the system or the slab from the 2018 earthquake were observed. A sample from the system influent contained PCE at 17,000 ug/m3, which the lowest measured concentration to date since the system began operating in 2015. System monitoring will continue on a weekly basis and the next sampling is scheduled for 2020. | Bill O'Connell |
| 8/2/2019 | Document, Report, or Work plan Review - other | Indoor air samples were collected from 5 locations in the basement of 555 Cordova St in February 2019. PCE was not detected in samples from two locations. PCE concentrations in the other three samples ranged from 1.3 to 1.6 ug/m3, below the ATSDR minimum risk level/DEC residential screening level of 41 ug/m3. | Bill O'Connell |
| 11/26/2019 | Update or Other Action | Site status changed to nonqualifying. Information pertaining to this releases is being tracked under File #2100.38.493 Snow White Cleaners | Bill O'Connell |
Contaminant Information
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Control Type
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Requirements
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There are no documents for this site report.
| Hazard ID | Site Name | File Number |
|---|---|---|
| 4591 | Snow White Cleaners | 2100.38.493 |
| 26240 | Fairview Areawide Brownfield Assessment | 2100.57.020 |