Highway 7 & Wooddale Highway 7 & Wooddale Avenue Vapor - - PowerPoint PPT Presentation

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

• f 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

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)

Chemicals of Concern

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