WCVBTV Boston Channel 5 “Decades-Old Company Goes High-Tech: Boston Sand And Gravel Adds Solar Panels” December 30, 2008. Thousands pass the flagship plant every day. Known for sand, gravel and cement, the 95-year-old firm has built its reputation on concrete using natural resources. But times are changing. Peer off Interstate 93 now, and you’ll see the latest project — more than 550 solar panels. Link to Video.