2020-10-28 EMC Meeting Agenda and Director's Informational Report

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• Lanihau SPS Force Main Replacement: Project will replace approximately 800 lineal feet of pipe form the Lanihau SPS and connect to the manhole at the Palani Road and Kuakini Street intersection. Construction team mobilized on 08/17/20 with substantial completion date projected by mid-October 2020. • Repair/Replace Hilo, Kulāʻimano, and Pāpa’ikou WWTP Programmatic Plans: All three WWTPs are nearing the end of their useful life along with being located in corrosive atmospheres, expediting the aging process. Kulāʻimano WWTP is nearing 45 years, Pāpaʽikou is nearing 37 years, and Hilo is nearing 30 years. The work will first conduct a condition assessment to develop a repair and replacement/upgrade (R&R) 20-year cost projection of what unit processes or major equipment should be repaired, replaced or upgraded. Included in this condition assessment phase is a process optimization evaluation to identify the strategies that can be incorporated into the design to reduce operating costs, improve process control, and increase digestion volatile solids reduction. Inherent to this optimization effort will be to review flows and loads projections and process modeling. The three major planning directions the county desires to evaluate are: 1. Whether the county should repair the existing WWTP; 2. Replace the entire WWTP with a new WWTP; or 3. Replace the existing process with a similar one on the existing WWTP site. NTP issued 09/14/20. • Other repair projects that are in the works: ◦ Hilo WWTP Headworks, Septage Receiving Station, and Primary Clarifier upgrades; ◦ Hilo Biotower Repairs: replace feed pumps and replace distribution arms and drives; ◦ Hilo WWTP: repair anaerobic digesters, dewatering units, and sludge drying; ◦ Kulāʻimano WWTP: repair headworks, secondary clarifiers, activated sludge reactors, and aerobic digesters; ◦ Pāpaʽikou WWTP: repair headworks, secondary clarifier center drive; ◦ Keopu SPS/FM Relocation and Replacement; ◦ Hale Halawai Force Main Replacement; and ◦ Kealakehe WWTP Headworks and Kealakehe SPS/FM Upgrades. G. ULU WINI (KALOKO) WASTEWATER TREATMENT PLANT: • WWD continues to maintain stability of the treatment plant with the goal of achieving consistent process data and meeting the regulatory as well as expected effluent limits. The treatment system currently meets DOH regulatory requirements, and nutrient removal is taking place. The longer term goal being considered is to install a gravity sewer line in Hina Lani Street that connects to the existing dry sewer in Queen Kaʻahumanu Highway as part of the North Kona Sewer Pump Station project. The Ulu Wini Housing community would connect to the gravity line, and the existing Kaloko WWTP would be decommissioned. 15