The cost of the proposed Glades Reservoir in North Hall has already exceeded $15 million, and taxpayers will likely soon pump more money into the project on consulting fees and additional environmental studies. The Hall County Board of Commissioners will meet for a work session Tuesday to discuss approving an additional $1.5 million in funding for AECOM, a firm contracted by the Army Corps of Engineers, to complete an environmental impact statement. An additional $150,000 is being earmarked for a study to determine if the endangered northern long-eared bat has habitat in the project area.