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KLEINFELDER Process water generated during the manufacturing process was discharged to the wastewater ponds. The waste stream included boiler blowdown, acidic and caustic wastes, and scrubber wastes. After sediment had settled out of the wastewater, the water was reclaimed for use on the crops grown on site. The manufacturing plant equipment required lubrication in the form of industrial greases. Hydraulic oil was also likely used in the plant equipment. The processing equipment was cleaned using acid or caustic solutions. Solvents were used in the machine shop for parts cleaning. Cutting oils were also commonly used in the machine shops. Maintenance activities at the Spreckels Manteca plant also included the repair of motor vehicles such as cars and farm machinery, and the maintenance of a locomotive operated on site by Spreckels. The locomotive maintenance was not conducted at a specific location but was done on the tracks wherever necessary. The Spreckels Manteca property also contained a large amount of cropland, mostly almond orchards and grain crops. The cropland served two purposes: providing a buffer zone between the factory and the adjacent community, and providing a means of disposing of clarified wastewater from the plant via irrigation. The sediment, which would accumulate in the wastewater ponds, was periodically removed and spread on the feedlot. Beet chips, organic material and dirt removed from the beets was also spread on the feedlot where cattle consumed the edible portion. 3.2 Backeround On This Area Since its construction in 1917, the Manteca Sugar Factory has been operated by Spreckels Sugar Company (Spreckels). As noted, above grade wastewater ponds collected wash water, wastewater and process water from the sugar refining operation. Process water generated during the sugar refining and plant operation was discharged to the wastewater ponds. Additionally, there are two small"finger ponds" on site where the water was used for irrigation. The wastewater ponds on site were permitted under 1961 Waste Discharge requirements. In 1977, the Waste Discharge Requirements (WDRs) were revised for the existing ponds (RWQCB Order No. 77-247). The waste discharge requirements outlined specific monitoring of the ponds, influent, effluent and groundwater. Monitoring was primarily for dissolved oxygen, temperature, pH, total dissolved solids (TDS), biological oxygen demand (BOD), chemical oxygen demand (COD), specific conductivity (EC) and flow. Most of the wastewater ponds were decommissioned in the.late 1970's or early 1980's due to the construction of the adjacent Highway 120 bypass. Most of the material was used as fill on the Spreckels site. The former wastewater pond levees were used for constructing the Highway 120 Bypass. The wastewater ponds that were decommissioned were no longer necessary due to the construction of additional cooling towers and clarifiers which reduced wastewater discharge from approximately three to one million gallons per day (3,000,000 to 1,000,000 mgd). 20-YPO-273/2000P331/2000W034 Page 5 of 1 I Copyright 2000, Kleinfelder,Inc. September 4,2000