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system was in operation with the effluent tank's wastewater being recirculated through the filter. Willie told MUD inspectors that the test kit used by AMP for monitoring metal concentrations in the wastewater was giving erratic readings with the display fluctuating between readings. AMP uses a color metric test kit for testing zinc levels in the wastewater. Willie said the test showed the level of zinc to in the effluent holding tank to be around 1. 6 mg/L. Willie pulled a small vial of purple/blue colored liquid out of the test kit and showed it to MUD inspectors Alex Baillie and Richard Stiffler. According to Willie the vial contained wastewater from the effluent holding tank that had been tested with AMP test kit. The purple/blue coloration indicates the present of zinc. Willie told MUD inspectors that he did not trust the test kit readings and is planning to send out a sample of the effluent holding tank for testing. MUD inspectors told Willie that 1. 6 mg/L is above the monthly limit for zinc specified in Federal Pretreatment regulations (40 CFR 433 . 17) . MUD inspectors also informed Willie that it was a good idea to test the effluent holding tank prior to releasing. It will be very difficult for AMP to retreat the effluent holding tank because all the other holding tanks are full. I asked Willie if any wastewater in the clarifier, stage 4, was ready for discharge. Willie told me that the pretreatment system had been run by Richard Craven on Monday (12-9-96) in recycle mode. AMP recycle mode for the pretreatment is to run the filter press by pulling wastewater/sludge off the bottom of the clarifier and returning the filtrate to mixing tank, stage 3, of the pretreatment system. The pretreatment system, stages 1,2 , 3 , and 4, are full of wastewater. The clarifier, stage 4, of the pretreatment system contained wastewater that had a murky grey coloration. The wastewater from the clarifier is discharged to the effluent holding tank. I also observed floating sludge/scum in the clarifier stage. I showed the floating material to Willie. Willie said "that isn't ' right". During the inspection, the pretreatment system was not in operation. AMP keeps acid, caustic, sodium metabisulfite, and polymer for the pretreatment in plastic 55-gallon drums under the pretreatment system catwalk. The pretreatment lift station for the non-chromated rinse water was completely full to the top and may have been responsible for the flooded condition in the pretreatment area. I asked Willie if the water on the floor was spillage from the lift station? He said "yes". The lift station receives raw wastewater from non-chromated plating operation. I measured the wastewater level on the floor with a tape measure. I found the level of wastewater covering the pretreatment floor to 3