Photo courtesy of Detroit Water and Sewerage Dept. Detroit sewer agency contract awarded to Lakeshore TolTest now has to be rebid. Related Links: Detroit water department to rebid contracts after protest Revenue Rises for ENR's Top 200 Environmental Firms The city of Detroit next month has to rebid two multiyear water and wastewater inspection and repair contracts, worth a total of $60 million, after Lakeshore TolTest Corp. filed for Chapter 7 bankruptcy liquidation days after receiving the work on April 23.The contracting mishap is just one result of the puzzling collapse of the firm, which had been grown through acquisition
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.