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Dora Beek, Wastewater Division Chief, provided a tour of the site (see original minutes for map and <br />tour details). The following information was discussed as she led the group to different areas of the <br />:. <br />1. Collection System & Sewerage Pump Station (SPS) on East Side: <br />- 90 total miles of gravity main of which 60% resides in ]Hilo Town. <br />Sewer Mains in Hilo were built as early as the 1900's.. <br />- Seven (7) sewage pump stations pump wastewater into which ultimately flow into the <br />HJTP. <br />2. HWWTP- <br />Goal is to decrease the amount . <br />disposal ocean <br />volume- Built in 1990 and designed as a 5 million gallons per day (MGD) WWTP. <br />- Current inflow •! • i` processing capacity. <br />treatment- Considered a Secondary Treatment Plant which meets State DOH permit discharge <br />requirements. Discharge permit is based on the Federal Clean Water Act. <br />- Primary treatment process reduces suspended solids and secondary treatment process <br />reduces the organics. <br />- Final disinfection + + from <br />Adminto the shoreline where it travels an additional % miles to ocean outfall. <br />3. HWWTP + <br />- Houses Storekeeper, perator Supervisors, collection <br />crew, mechanics and electricians. <br />- Laboratory operated by the Sanitary Chemists who conducts tests such as BOD <br />(Biochemical Oxygen Demand), TSS (Total Suspended Solids), Turbidity, total residual <br />chlorine and other tests required under the DOH discharge pen -nit. <br />. 2 Phase Treatment Process — Liquids and Solids Handling: <br />- Pretreatment of raw sewage and septage from haulers is done at Headworks Section.. <br />- Headworks Section is comprised of the bar screens, aerated grit tanks and pre -aeration <br />tanks. <br />- Primary treatment removes suspended solids. <br />- Secondary treatment is the biological decomposition of organic materials by naturally <br />occurring microbes followed by clarification. <br />- Solids Contact Channel - further biological decomposition of effluent received from the <br />biotower wet well. <br />- Secondary Clarifiers allow solids formed in the Solids Contact Channel to settle out before <br />disinfection. <br />- Disinfection reduces bacteria to acceptable levels per DDH permit, Disinfection takes <br />place in the effluent line as the effluent travels by gravity to the outfall. <br />ADJOURNMENT,11. <br />Commissioner Nahm-Mijo made a motion to adjourn. Motion was seconded by <br />Commissioner Warner. h- n passed unanimouslyand the meeting adjourned <br />