The EIS addresses the cumulative effects of constructing and operating three conveyance tunnel systems which are part of the total Tunnel and Reservoir Plan (TARP) proposed by MSDGC. These three tunnel systems are: Mainstream (59th Street to Addison Street), Calumet, and Lower Des Plaines. Where appropriate, this statement also assesses the effects associated specifically with the Calumet Tunnel system route. Two other statements address separately the effects associated with the Mainstream Tunnel system and the Lower Des Plaines Tunnel system. The Mainstream statement has already been developed and issued, whereas the Lower Des Plaines statement is currently in the development stage. These tunnel systems comprise what is referred to in the statement as 'TARP, Phase I.'