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Environmental Remediation
Source: WORLD DREDGING Mining and Construction Lake Kittarnaqundi is a 27-ac. reservoir located in Columbia, Maryland, renowned as one of America’s first—and most successful—planned cities. In the spring of 2010, The Columbia Association, the owners of the lake, hired Cashman to clear the sediment and weeds that had accumulated since the lake was constructed. The Cashman team scoped out the project, identified two significant logistical challenges, and began the detailed planning that would enable them to get the work completed. First, Kittamaqundi was clogged with water thyme (hydrilla vertieillata)—the aquatic weed with multibranched stems can easily reach lengths of 25...
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May 1990 Source: Engineering News Record Environmental officials in Massachusetts spent $14 million to dredge and incinerate a “hot spot” of polychlorinated biphenyls (PCB’s) at the bottom of New Bedford harbor. The cleanup purged sediments in a 5-acre area of the Acushnet River estuary where about 45% of the harbor’s chemicals and heavy metal pollutants are concentrated. The 1000-acre harbor has the nation’s highest concentration of PCB’s and is one of the worst sites on the Superfund National Priorities List. Dredging the “hot spot” is intended to curb migration of contaminants into the rest of the harbor. The cleanup’s first...
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