The DRI is about twelve miles long and parallels the Detroit River from the Wastewater Resource Recovery Facility (WRRF) to the East Detroit City limits at Alter Road. The size of the interceptor ranges from 16 ft. at the WRRF to 8 ft. at Alter Road. The purpose of the DRI was to bring most of the Detroit’s sewage to a common point to prevent newly constructed sewers from discharging directly into the river. The DRI drains the Conner Creek, Fox Creek, East Jefferson, and Central City Districts. It also receives flow from suburban communities located in Wayne, Oakland and Macomb counties. The project requires investigation, design and construction services to rehabilitate DRI. All repairs must be made in live sewer conditions with daily flow control coordination and management. Construction of new cast-in-place concrete gate structures will aid with daily flow control measures. Sewer repairs include debris removal, tuck-pointing and crack repair, tap repairs, cementitious and chemical grouting, lining and cast-in-place concrete gate structures.