<p>Someday the Lake Calumet Basin on Chicago's South Side could be the site of treatment wetlands and recreational activities.</p><p> But right now, officials of the Metropolitan Water Reclamation District of Greater Chicago are concerned about the cost of the project that could transform the <a href="http://www.southeastenvironmental.org/open.html">Lake Calumet</a> area.</p> <p class="MsoNormal c1"><o:p> </o:p></p> <p class="MsoNormal c1">&nbsp;</p>