Here are a few important Engineering, Environmental, and Government Web Sites: 

Wetlands_Regulations_Federal_CFR 33 Part 328

StateofIllinois-HomePage

National Technical Information Service

WetlandsDelineationManual_USArmyCorpsofEngineers_1987

United States EPA

U.S.EPA'sKerr Lab Home Page

Indiana Department of Environmental Management

Welcome to the Illinois Department ofNatural Resources Home Page

EMS-HSMS Information Center

INDOT