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1 F. Contaminants Two sources of hazardous material are present at the facility: 1 ) hydrocarbons found at the fuel and oil bunker, and 2) hazardous components of NALCO 9810 . All fuel, oil and waste oil tanks are j located above ground and located within a fully contained concrete j bunker. I The flocculant is delivered to the site in 250 gallon containers . The container is located adjacent to the recycle pond. NALCO 9810 is an acrylamide sodium acrylate copolymer in a water and hydrocarbon emulsion. This very effective flocculant is in common use in mining operations and has been successfully used in Brown Sand operations since July 1990. Two hazardous ingredients are listed in the MSDS for NALCO 9810 . A paraffinitec/naphthenic solvent (CAS #54742--47-8) comprises 20%-400 of the flocculant. Ethoxylated nonylphenol (CAS#9016-45-9 ) comprises 1%-100 of .this product. Waters from the recycle pond at the Brown Sand Manteca plant as well. : as seepage to the excavation from the recycle pond were sampled on February 27 , 1991 to demonstrate the concentrations of extractable hydrocarbons present in the waters. No extractable hydrocarbons were identified in the analysis from either of these samples. G. Waste Water: A zero-discharge process water recycling system is employed at the gravel operation. No waste water is generated from gravel processing operations . I . Ore Processing 1 . The plant operates as follows (see diagram) : Raw material is fed into the Grizzly Feed Hopper. From the hopper the material travels via conveyors to a Telsmith "Super Scrubber. " The super scrubber is a high speed, 800 GPM rotary washer which is very effective in removing dirt, clay, and other extraneous matter from all kinds of aggregates . once the aggregate material is thoroughly washed, it exits onto a Hewitt-Robbins Wet Vibrating Screen Deck for sizing. Materials leaving this screen deck are split into one of four material flow routes . These routes are to: ; 1 . a Symons Cone Crusher, i 2 . a Lippmann Jaw Crusher, 3 . the pump to the 36" Sand Screw, or 4 . the Main Plant Feed Conveyor. The aggregate material that is directed to the crushers is crushed and returned via an underfeed and return conveyors to the Super Scrubber. Each crusher has spray bars and enclosures at the throat and discharge point of the unit. These control measures will provide a maximum level of control to reduce any possible PMIO emissions from the unit. The washer on top of the main plant is a Hewitt-Robins Wet Vibrating Screen Deck. The sized aggregate material continues into the remainder of the