Backhoes will begin moving dirt on Monday for a new building at Promega Corp.’s Fitchburg campus — the biggest building yet for the privately owned biotechnology company. Promega is adding a 266,000-square-foot building at the corner of East Cheryl Parkway and Woods Hollow Road, across the street from its Biopharmaceutical Technology Center. Construction alone is expected to cost $90 million, not counting equipment and furnishings, and 100 employees could be added. Groundbreaking ceremonies were held Thursday.

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