APPROVED SOURCES

PRECAST CONCRETE BOX CULVERTS

SUPPLIER PLANT LOCATION

American Concrete Products                                    Omaha, NE

Cretex Concrete Products Midwest, Inc                   Des Moines, IA

County Materials Corporation                                   Holeman, WI

County Materials Corporation                                   Iowa City, IA

Cretex Concrete Products Midwest, Inc.                  Cedar Rapids, IA

Cretex Concrete Products Midwest, Inc.                  Humboldt, IA

Cretex Concrete Products Midwest, Inc.                  Iowa Falls, IA

Cretex Concrete Products Midwest, Inc.                  Marshalltown, IA

Hancock Concrete Products                                     Canon Falls, MN

Hancock Concrete Products Company                     Hancock, MN

Hancock Concrete Products                                     Lake View, IA

County Materials Corporation                                   Buffalo, IA

Rinkers Materials Concrete Pipe Division                 Valley, NE

PRECAST BRIDGE ELEMENTS

Oden Enterprises, Inc.                                              Wahoo

               Wieser Concrete                                                       Portage, WI