Eugene/Springfield Water Pollution Control Facility 1984-1991

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Page 34 Section E: RBSIDUALS MANAGBMBNT FACILITB3S OPBxATIONS FUNCTIONAL RESPONSIBILITIES The primary responsibilities ofResiduals Manage- ment staff are to operate the CWMF within all DEQeffluentpermitrequirements, tooptimize the use of available nitrogen as a supplemental fertil- izer during the disposal process, and to maintain reasonable operational costs for Agripac. Staff are also responsible for meeting contractual obligations with Agripac Inc. and for adhering to the land lease and irrigation schedule agreements made between MWMC and the leaseholder, who farms the agricultural land at the disposal site. STAFFING Originally, staff for the seasonal industrial solids program consisted of one manager/supervisor and three operators. The operators had previously worked at the old Eugene trickling filter plant and were rehired to work at the new plant. The assis- tant superintendent of the Wastewater Division directed the start-up and operation of the facility through its first season in 1984, acting as both manager and supervisor. Before beginning the second year of operation, increasing job demands and responsibilities at the main plant forced a reorganization. The duties of the assistant superintendent were divided, and a new Agripac supervisor position was created and filled. The Wastewater Plant's process control manager assumed managerial responsibilities for the seasonal industrial wastewater site. In 1986 and 1987, additional staffing changes occurred. Several operator job tides were changed and positions upgraded. Near the end of the Au- gust 1987, a reorganization of the Wastewater Plant's management structure affected the staffing of the CWMF. The maintenance manager and operations manager positions were combined into a Plant Manager position at the wastewater plant. A technician was transferred from the main plant to the seasonal industrial waste disposal program. InApri11988, apermanentsupervisorwashired to manage the seasonal industrial waste program and the solids program. The new supervisory job was created by combining supervisory positions from each program. No staffing changes occurredat the seasonal indus- trialdisposal facility in 1989. However, combining the Seasonal Industrial Disposal Operation and the Solids Program into the Residuals Manage- ment program resulted in a duplication of work duties for the Technician III and Technician II at the two work sites. In 1990, one of two Wastewater Technician III positions in the Residuals Manage- ment section was eliminated and replaced as a Wastewater Technician IV. The new Technician IV became the lead technician for both programs. CANNERY SITE EQUIPMENT AND PROCESSES Agripac is responsible for the screening and pri- mary clarifier operation. The City of Eugene is responsible for sampler operations and for the operation of all downstream equipment and pro- cesses. The in-line automatic sampler is stationed immediately downstream from the primary clari- fierandwaste screen.Apumpstation-consisting of a fiberglass wet well, two 2.3-MGD centrifugal pumps, and a control system -provides flow options for pressure or gravity flow. The pump station system includes an emergency overflow to the sanitary sewer system. The cannery site also houses a caustic feed system to help control odors that can occur in the piping that transfers the waste from the cannery to the lagoon and irrigation facility. The caustic system consists of a 4,300-gallon sodium hydroxide stor- age tank and a 20-gpm chemical feed pump. Vegetable processing waste is screened before pri- mary clarification to remove rocks, sticks, and other large debris before the waste enters the pump stationwetwell. Duringprimaryclarification, most of the heavy settleable solids -such as mud and recycle wash water from carrot processing - is removed. FORCE MAIN TRANSFER PIPING The force main transfer system consists of an 8.3- mile-long, 12-inch pipe, with a volume of 0.26 MGD. At the design flow rate of 2.3 MGD, the waste travels from the cannery to the lagoon and irrigation facility in 2.7 hours. The piping system can be cleaned by pigging. Seven air release valves and two combination airandvacuum release valves located in manholes protect the piping system and equipment from a pressure build up.