• Bedrock at site is RHYOLITE (Per DEP Response Action Outcome, 243 pages)
• RHYOLITE has high SILICA content, as does granite
• Silica is second most common element in the earth's crust 27.7%
• Silica is found in many types of rock and ore
• Exposure to even small particles of silica can cause silicosis, an incurable lung disease
• www.cdc.gov/niosh/docs/97-118/default.html - SIlica: It's not Just Dust from CDC
• www.osha.gov/dsg/topics/silicacrystalline/ -OSHA Construction Standards issued September 23, 2017.  The ZBA should make sure the levels are monitored at the site.