Collecting parking lot sealant samples
![Image: Collecting parking lot sealant samples](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/2610RTA515-ext2.jpg?itok=TPTQZ8um)
Detailed Description
USGS scientist Barbara Mahler uses a special vacuum (a model HVS3 High Volume Surface Sampler) to collect dust samples to be evaluated for contaminants.
Sources/Usage
Public Domain.
USGS scientist Barbara Mahler uses a special vacuum (a model HVS3 High Volume Surface Sampler) to collect dust samples to be evaluated for contaminants.
Public Domain.