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United
States Environmental Protection Agency
Region V
POLLUTION REPORT
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| Date: |
Friday, June 20, 2008
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| From: |
Sonia Vega/Kathy Clayton/Steve Renninger
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Subject:
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U.S. EPA Completes the Installation of Vapor Abatement Systems
Highway 7 and Wooddale Avenue Vapor Intrusion Investigation
6528 W. Lake Street,
St. Louis Park, MN
Latitude: 44.9392000
Longitude: -93.3567000
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| POLREP No.: |
6
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Site #:
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B5KU
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| Reporting Period: |
May 30 to June 20, 2008
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D.O. #:
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| Start Date: |
3/17/2008
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Response Authority:
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CERCLA
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Mob Date: |
2/29/2008
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Response Type:
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Time-Critical
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| Demob Date: |
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NPL Status:
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Non NPL
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| Completion Date: |
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Incident Category:
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Removal Action
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| CERCLIS ID #: |
MINN000510267
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Contract #
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| RCRIS ID #: |
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As of June 20, 2008, U.S. EPA has collected 269 sub slab samples, 220 from residential properties, and 49 from commercial/industrial properties. Fourty-one residential properties had sub slab results over MDH's screening level for PCE and/or TCE. Also, 12 commercial/industrial properties exceeded the MDH's screening levels.
EPA collected indoor air samples at 52 properties; 40 residential, 12 commercial. One residential property owner denied access for the indoor air sampling.
Indoor air sampling results showed exceedances to the MDH's indoor screening level for TCE and/or PCE at 8 residential properties. An additional 3 residential properties exceeded MDH's combined hazard index. Five commercial properties exceeded the MDH's indoor commercial screening levels.
A decision was made to offer a vapor abatement system to all residential properties with sub slab exceedances, regardless of the indoor air sampling results. Installation of vapor mitigation systems at these properties began on March 17, and as of June 20, all 40 systems have been installed.
Abatement system performance sampling began, and so far 33 properties have been sampled. All properties sampled showed dramatic reduction in the levels of VOCs. Three residential properties still exceeded sub slab screening levels, and one property exceeded the indoor air screening level but not the sub slab, which might be indicative of an indoor source.
All 40 residential properties where abatement systems were installed, will be sampled 30 and 90 days after system installation. Any necessary adjustment to the systems will be made after the 90-day performance sample.
Also, during this reporting period, the first round of groundwater samples was collected the week of June 9, and another groundwater sampling event will take place in December 2008, as part of the ongoing groundwater investigation.
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Collect performance samples 30 and 90 days after system installation at all properties.
Continue notification to property owners of their results, and continue with public outreach.
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Complete the groundwater investigation, and continue the search for potential sources of contamination.
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Budgeted |
Total To Date |
Remaining |
% Remaining |
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Extramural Costs
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| ERRS - Cleanup Contractor |
$410,000.00 |
$258,498.00 |
$151,502.00 |
36.95% |
| RST/START |
$0.00 |
$73,295.00 |
($73,295.00) |
0.00% |
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Intramural Costs
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| Total Site Costs |
$410,000.00 |
$331,793.00 |
$78,207.00 |
19.07% |
* The above accounting of expenditures is an estimate based on figures known to the OSC at the time this report was written. The OSC does not necessarily receive specific figures on final payments made to any contractor(s). Other financial data which the OSC must rely upon may not be entirely up-to-date. The cost accounting provided in this report does not necessarily represent an exact monetary figure which the government may include in any claim for cost recovery.
response.epa.gov/highway7andwooddaleavenue
POLREP #6 Last Updated 6/20/2008
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