Danvers: Danvers Selectman Gardner Trask follows a presentation by Dr. Scott Davis, vice president of explosion and fire safety at GexCon US, a company hired to conduct an investigation of the 2007 CAI Chemical Plant explosion in Danversport, during a presentation hosted by CAI at the Sheraton Ferncroft in Danvers on Wednesday. Photo by Matthew Viglianti/Staff Photographer Wednesday, May 27, 2009.

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