Highway 7 & Wooddale Highway 7 & Wooddale Avenue Vapor Avenue Vapor Study Background Study Background Public Meetings, December 13 and 15, 2007
MPCA Project Team � Doug Wetzstein, Supervisor � Dave Moore, Project Leader � Dave Scheer, Hydrogeologist Partnership with Minnesota Department of Health, City of St. Louis Park, Environmental Protection Agency - Region 5
History � Chlorinated solvents detected in shallow SLP aquifer � St. Louis Park municipal wells are routinely tested by the MDH. There are no issues with the drinking water. � Investigation shifts from source of solvents to potential for soil vapor “intrusion” in nearby residences/ businesses
Chemicals of Concern � Perchloroethylene (PCE) � Trichloroethylene (TCE) Uses: � Metal Cleaning/ Degreasing � Dry-cleaning � Chemical release may be responsible for several chemicals in environment: � PCE � TCE � DCE � Vinyl Chloride � Ethene (non toxic)
MPCA Investigation, Phase I February 2007 Report February 2007 Report � Screening to learn if levels of PCE/ TCE in groundwater could cause solvent soil vapor � 23 samples in public right of way, 8 ft. below surface � Result: Vapor concentrations in soil range from Non-detect in 4 samples, up to 388 ppb for PCE and 165 ppb for TCE � Test method screens for 67 different chemicals
MPCA Investigation, Phase II September 19, 2007 Report September 19, 2007 Report � Screening to learn boundary of solvent vapor in soil � 74 samples collected/analyzed; 39 found no detection of chemicals � Information used to identify Areas A/B. � Requested EPA assistance due to project complexity and size of study area
St. Louis Park Schools Samples collected over the weekend of Nov 30 & Dec 1 � 4 samples from High School � 8 samples from Central Community Center � All sample concentrations either Non- detect or very low
For More Information � Dave Moore, Project Manager � 651-296-7397 � david.moore@pca.state.mn.us � Dave Scheer, Hydrogeologist � 651-296-6630 � dave.scheer@pca.state.mn.us � MPCA website: www.pca.state.mn.us
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