Document: Potential environmental impacts of frac sand mining

Related story: Frac sand miners failing to check for rare butterfly? DV.load(‘http://www.documentcloud.org/documents/288492-wisconsin-dnr-informational-doc-on-silica-sand.js’, {
width: 900,
height: 1200,
container: “#DV-viewer-288492-wisconsin-dnr-informational-doc-on-silica-sand”
});