SITE INFORMATION AND CORRESPONDENCE 1980-1999

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FACT SHEET ATTACHMENT C WASTE DISCHARGE REQUIREMENTS ORDER NO. 5-00- CITY OF LODI WHITE SLOUGH WATER POLLUTION CONTROL PLANT SAN JOAQUIN COUNTY I. BACKGROUND The City of Lodi operates a wastewater collection, treatment, and disposal system, and provides sewerage service for the City of Lodi. The majority of the industrial wastewater is collected in a separate sewer. The primary source of industrial wastewater is from food processors, with smaller flows from metal finishers. Untreated industrial wastewater is combined with biosolids generated in the treatment plant and is reclaimed in the summer by irrigating approximately 950 acres of agricultural land owned by the City. During the winter the wastewater is stored in 40 acres of ponds. The Discharger is looking into purchasing 500 additional acres of land for reclamation and biosolids application. Unchlorinated domestic effluent is mixed with the industrial wastewater and used for reclamation when industrial flows do not meet agricultural needs, when wastewater does not meet effluent limits, or when dissolved oxygen in the receiving water is less than 5 mg/l and surface water discharges are prohibited. The reclaimed water and biosolids are used for surface irrigation of fodder, fiber, or seed crops. Also, reclaimed water is used as cooling water in a closed loop system at a cogeneration facility, and for mosquito fish rearing in ponds adjacent to the treatment plant. II. REGULATORY BASIS FOR REQUIREMENTS a) Basin Plan The Board adopted a Water Quality Control Plan;Fourth Edition, for the Sacramento River and San Joaquin River Basins (Basin Plan) that designates beneficial uses, establishes water quality objectives, and contains implementation programs and policies to achieve water quality objectives for all waters of the Basin. These requirements implement the Basin Plan. The beneficial uses of Dredger Cut and the Sacramento-San Joaquin Delta downstream of the discharge as identified in Table II-1 of the Basin Plan are municipal, industrial, and agricultural supply; body contact and noncontact water recreation; aesthetic enjoyment; navigation; and preservation and enhancement of fish, wildlife and other aquatic resources. The beneficial uses of the underlying groundwater are municipal, industrial, and agricultural supply. b) Dissolved Oxygen The Discharger has completed an expansion of its secondary domestic waste treatment capacity to 8.5 mgd, but the effluent flow rate allowed by this permit has not been increased beyond 7.0 mgd due to concerns regarding the impact of the discharge on dissolved oxygen concentrations in the receiving water. The previous permits have required compliance with the dissolved oxygen objective at the point where Dredger Cut meets White Slough. However, this approach does not