Eugene/Springfield Water Pollution Control Facility 1984-1991

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Section E: RESIDUALS IvIANAGEMENT FACILITIES OPBRATIONS Page 35 SEASONAL INDUSTRIAL WASTEWATER DISPOSAL SITE The wastewater irrigation disposal system is lo- cated on a 280-acre site. Its main components are spray irrigation equipment, a storage lagoon, an irrigation pumping station, an aerated wet well, a groundwater monitoring system, a runoff collec- tion system, and a chlorination system for odor control. • Irrigation Equipment The spray irrigation system consists of four center pivots that irrigate 190 acres of tall fescue grass seed crop. • Storage Lagoon Cannery wastewater can be spray irrigated directly onto the site through the on-site pumping station or stored in a 14-acre lined lagoon to be used for later irrigation. The liner of the lagoon is 56 millimeters thick and consists of anylon-rein forced mesh material sandwiched between two layers of rubberized sheeting. The lagoon holds a maximum volume of approximately 56 million gallons. A minimum of five feet of water is always maintained in the lagoon toprevent the linerfrom floating when groundwater levels rise. The lagoon is equipped with 20 floating surface aerators. Any combination of aerators may be operated to main- tain adequate dissolved oxygen levels in the la- goon. • Pumping System Food processing waste enters the disposal site through a 100,000-gallonaeratedwetwell located at the pumping station or is transferred to the lagoon for storage. When routed through the ba- sin, the wastewater is used to irrigate the 190 acres of tall fescue grass. The fields are irrigated by two 800-gpm centrifugalpumps andone 350-gpmpump. Three motorized strainers are located at the dis- chargepoint of each pump to prevent clogging of the spray nozzle. • Groundwater Monitoring System A groundwater monitoring system, consisting of 17 two-inch-diameter monitoring wells, provide. access for staff to take samples of groundwater. Careful monitoringensurespollutants donotleach into the groundwater. • Runof f Collection System The disposal site has a drainage system to handle excess percolation from rain and runoff from the irrigation system. The drainage system collects water contaminated by the food processing wastes andpumps it into the storage lagoon. This ensures that contaminated water does not drain into natu- ral waterways. The system includes three ground- water pump stations and a number of drain pipes and ditches that monitor, collect, and pump the site runoff. CANNERY WASTE CHARACTERISTICS The seasonal irrigation operation begins in April. Rhubarb is processed through May. Broccoli and cherries are processed June through July. Beet processing begins in July and continues through August. August also marks the beginning of corn processing, which continues through October. Carrots are the last vegetable processed. Process- ing begins in September and continues through December. • Rhubarb Waste An average total flow of 1.5 MG of rhubarb pro- cessing waste is received each season -April through May. Rhubarb waste has a typical pH of 5.0, an average BOD of 250 mg/L, and an average TSS of 174 mg/L. To control odors, rhubarb wastes are discharged into the lagoon rather than irri- gated directly from the aeration tank. Rhubarb Storage lagoons can hold up to 56 million gallons o f cannery waste.