See PolRep #1.
40 vapor abatement systems were installed. Of the 40 systems installed, 39 already underwent 30-day performance sampling, and 32 also had the 90-day performance sample collected. All showed dramatic reductions on the VOC levels.
The last system installed is due for the 30-day sample next week, and the rest will be schedule that week as well. A fan was replaced at one of the properties due to noise problems. Any necessary adjustment to the systems will be completed after the 90-day performance sampling.
U.S. EPA 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.
Continue performance sampling and make any modifications needed.
Collect the second round of groundwater samples in December, as planned.
None at this time.
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