Mass vaccination drive-thru site set to open in Delaware County A mass vaccination drive-thru site is set to open on Saturday at Delaware County Community College. DELAWARE COUNTY, Pa. - A mass vaccination drive-thru site is set to open on Saturday at Delaware County Community College. "They’ll pull their car in. They’ll get their last check of the paperwork and they’ll get their shot. It’s that simple and that efficient. We hope to do more than 250 an hour," Timothy Boyce director of emergency services, said. Their goal is 2,200 doses over the weekend of the one-shot Johnson & Johnson vaccine.