Think they're all laying low after the FBI took them to the cleaners over price fixing ; )  I heard Bierma doesn't work there anymore.  Per my phone book, try:

GCC: 546-7866  Le Mars

722-1646 Sioux Center

737-4882  Orange City

479-2261 Little Rock

552-2780 Hawarden

754-3199 Sibley

737-4878  Orange City

We quit doing business with them because service got so bad during the investigation.  Cement has been cheaper lately in the area though!!  : )