USCG helicopters rescue 1,037 people from roof tops. USCG air & surface units assist with the evacuation of 9,400+ patients and staff from hospitals in the greater New Orleans area. The 17th Street Canal levee breach was closed with truckloads of rock and sandbags. The canal reopened so that it could be used to pump water out of the city. 33,608 Army National Guard and 6,613 Air National Guard were deployed (40,221 total). USCG Air Operations conducted 650 sorties rescuing 6,900 people. USCG Surface Operations conducted 31 sorties rescuing 10,950 people. For a total of 17,940 people rescued in the greater New Orleans area. Rescue workers said that there were still many, "holdouts," who were not heeding the mandatory evacuation order first issued by Nagin on August 28. They were concerned about their property being looted, were unaware of the full extent of the disaster, worried about their pets, or concerned that conditions would be worse in the shelters. Due to unsanitary conditions in the city, as well as contaminations of E. coli bacteria in the standing water in the city, Nagin ordered the forced evacuation of everyone that was not involved in cleaning up after Hurricane Katrina.  38,093 Army National Guard and 5,770 Air National Guard were deployed (43,863 total). Senator Barbara Mikulski (D-MD) called for Michael D. Brown's resignation. House Minority Leader Nancy Pelosi (D-CA)and Senate Minority Leader Harry Reid (D-NV) voiced criticism of the disaster's handling, and of the Bush administration's management, delegation of control, leadership, and human consideration. USCG Air & Surface Operations rescue 10,182 people in the greater New Orleans area.  39,736 Army National Guard and 5,952 Air National Guard were deployed (45,688 total). President Bush issued an executive order suspending the Davis-Bacon Act of 1931, allowing federal contractors rebuilding after Katrina to pay below the prevailing wage. This action upset labor leaders and Democrats in Congress, who feared that it would make it more difficult for union contractors to win bids.  40,667 Army National Guard and 5,735 Air National Guard were deployed (46,402 total). USCG Air & Surface Operations rescue 342 people in the greater New Orleans area. Federal Emergency Management Agency (FEMA) Director Michael Brown was removed from directing Hurricane Katrina relief efforts in New Orleans by Homeland Security Secretary Michael Chertoff. He was replaced by Vice Admiral Thad W. Allen, Chief of Staff of the United States Coast Guard.