METRODOME ROOF COLLAPSE

The inflatable roof over the Hubert H. Humphrey Metrodome in Minneapolis, Minnesota was made from ten 10 acres of fabric, weighing approximately 580,000 pounds.  Its dual layer construction consisted of a Teflon-coated fiberglass outer layer and an inner layer of acoustical material.  During winter months, warm air circulated between the layers to help melt snow on the roof.   Continuously monitoring weather, a sophisticated environmental control system managed the temperature and air flow in the roof.  


GRANITE QUARRY VANDALISM

Pinnacle Engineering was hired by the operator of a granite mining and aggregate facility to respond to an incident in which vandals set fire to numerous pieces of stationary and mobile material handling equipment and a building storing solvent, paint and oil; drained oils from lubrication systems on large crushing and conveyance systems; and opened two delivery nozzles on a large above-ground diesel fuel storage tank.  


SURFACE WATER MONITORING

Pinnacle Engineering has assisted clients in several high-profile incidents where hazardous material cargo was released along or within surface water or wetland environments.   Many of these incidents occurred along the Mississippi River, within designated refuge areas managed by the U.S. Fish and Wildlife, resulting in use of Incident Command Systems (ICS) and significant involvement and oversight by multiple regulatory authorities.