WT36-25/26 DETAILED DESIGN AND CONSTRUCTION OF KUHLS ROAD NEW SPS, PRESSURE & GRAVITY SEWER MAINS

Summary and scope

The Highfields & Meringandan Sewerage Catchment Study Planning Report 2021 (HMSCSPR) identified pumping issues in and around the Highfields town centre and in the vicinity of the New England Highway. Four sewer pump stations (SPS) have a common rising main which runs along Highfields Road discharging into a gravity sewer manhole near Lauder Drive. Two of these SPSs are currently not able to meet peak wet weather flow requirements. A copy of HMSCSPR is included in the “Reference Documents” of the Principal’s Project Requirements (attached).To overcome this pumping issue, the solution identified in the HMSCSPR was the installation of a new sewage pump station in the northern corner of Kuhls Road Park, off Clarke Road. The proposed pump station allows for decommissioning of existing sewer pump stations HIPS1, HIPS2 and HIPS4, followed by decommissioning of HIPS3 in 2031. Hence the new pump station should have capacity to accommodate inflows from all the decommissioned SPSs. The locations of these existing SPSs with suggested alignments of sewer mains are detailed in Figure E-6 and Figure E-7 included as Highfields Augmentations in the “For Information” documents of the Principal’s Project Requirements (attached).