Specifications include, but are not limited to: he project contemplated consists of removing and replacing the Primary Sludge Drain (PSD) and Air High Pressure (AHP) pipes of Primary Clarifiers #2 and #8 (PC2 and PC8) and associated work at the Milwaukee Metropolitan Sewerage District’s (MMSD) Jones Island Water Reclamation Facility (JIWRF). In PC2 the existing 6-inch diameter HDPE PSD pipe and 1-inch diameter HDPE AHP pipe each extend approximately 130 feet from the sludge hopper through a cleanout manhole to the East Pump Station and were installed in 2001. In PC8 the existing 6-inch diameter HDPE PSD pipe and the 1-inch diameter HDPE AHP pipe each extend approximately 110 feet from the sludge hopper through a cleanout manhole to the West Pump Station and were also installed in 2001. The PSD and AHP pipes pass through 12-inch inside diameter carrier pipes. The carrier pipes are mostly vitrified clay, but the portions in the areas to be excavated in each clarifier are HDPE. The cleanout manhole for each Primary Clarifier contains two wyes and two risers each extending approximately 30 feet to the surface. For each Clarifier the Contractor shall cut and remove a small section (approximately 35 – 50 square feet per clarifier) from the concrete floor of the clarifier near the central sludge hopper. When saw-cutting openings in clarifier floor slabs the Contractor shall take care to preserve as much of the existing rebar as possible to facilitate the use of couplers and splices during restoration. The Contractor shall excavate down approximately 13 feet to the carrier pipes in each Clarifier and remove the carrier pipe to expose the PSD and AHP pipes inside. Fill under the concrete floor is expected to be cementitious grout extending all the way down to the carrier pipe. For PC2 only, the Contractor shall cut and remove an additional small section approximately 48 – 54 inches square located between the sludge hopper and cleanout manhole, excavate down approximately 15 feet through cementitious grout fill to expose the carrier pipe, and remove the 14-inch HDPE carrier pipe between the two Fernco joints to expose two 22 degree bends in the PSD and AHP pipes. The Contractor shall remove the existing PSD and AHP pipes from the sludge hopper all the way to the gallery in both PC2 and PC8, leaving the clay portions of the carrier pipes in place. The Contractor shall remove the existing wyes and risers in the cleanout manholes and replace them with 6-inch HDPE wyes and risers. The Contractor shall install new 6-inch HDPE PSD and 1-inch HDPE AHP pipes with necessary connections to replace the removed pipes. The Contractor shall install new carrier pipe to replace that which was removed and make connections to the existing carrier pipe. The Contractor shall bed the pipes, cap them with concrete, and backfill the excavations with flowable fill. The Contractor shall patch the concrete in the floor of the clarifiers and seal the joints around the edges of the patches.