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WASTE DISCHARGE REQUIREMEhsS ORDER NO. R5-2007-_ �4we 3 <br /> CITY OF TRACY AND LEPRINO FOODS COMPANY <br /> LAND DISCHARGE UNITS OF THE TRACY WASTEWATER TREATMENT PLANT <br /> SAN JOAQUIN COUNTY <br /> 8-acre lagoon, known by the City as Pond 2, is leased for operation by Leprino. The <br /> purpose of the secondary lagoon is divided into two sections by a floating baffle to allow <br /> for settling of the biosolids and clarification of the pretreated wastewater. A rotary screen <br /> polishes the pretreated water just prior to discharge to an adjacent 8-acre unlined lagoon <br /> owned and operated by the City known as Pond 1. The operation of the rotary screen is <br /> enhanced by addition of a flocculent emulsion polymer prior to screening. Biosolids are <br /> stored in the main lagoon section and are allowed to stabilize in a facultative mode. <br /> Operation of the Leprino lagoon is regulated by the industrial pretreatment permit issued to <br /> Leprino. <br /> Wastewater may infiltrate into the underlying groundwater from the Leprino operated <br /> pretreatment units. Therefore, discharges from the Leprino operated pretreatment units <br /> are regulated by this Order. <br /> 8. The City's unlined industrial holding ponds cover approximately 52 acres. The ponds were <br /> originally constructed to provide storage of peak industrial wastewater flows during the <br /> summer canning season to prevent overloading of the main treatment facility. Since there <br /> are no longer canneries in the Tracy area that discharge to the Facility, the industrial <br /> holding ponds are currently used to store food processing wastewater from Leprino, water <br /> from construction dewatering, and process wastewater from the main treatment facility <br /> (e.g. digester supernatant, pump seal water, boiler cooling water, etc.). Effluent from the <br /> industrial ponds enters the main treatment facility at the primary sedimentation basins. A <br /> flow schematic of the industrial facilities is shown in Attachment C, which is attached <br /> hereto and made part of this Order by reference. The industrial ponds allow the <br /> wastewater to percolate to groundwater. Therefore, discharges from the industrial holding <br /> ponds are regulated by this Order. <br /> 9. The wastewater contained in the industrial holding ponds include constituents such as total <br /> dissolved solids (TDS), electrical conductivity (EC), BODS, and total suspended solids <br /> (TSS). The following table presents wastewater concentrations for selected constituents <br /> collected from the unlined industrial ponds from 2000-2004: <br /> Constituent Units Averaqe Maximum <br /> BOD. mg/L 84(') 479(' <br /> TSS mg/L 179(' 1580" <br /> EC Nmhos/cm 3,669") 4,773 <br /> TDS mg/L 2,331(21 2,942 <br /> Chloride mg/L 496(21 533 <br /> Sulfate mg/L 198(21 270 <br />