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v 1%0 VO MEMORANDUM _ 4 _ City of Tracy When you consider the number of equipment failures that affected the secondary pro- cess during the months of August thru September you wonder how the effluent even approached compliance with the constituent limitations. Modifications to the secondary sludge removal system and operation of the dry polymer feeder could probably have been the difference between compliance and non- compliance of BOD, Suspended Solids, and Settleable Solids, with the exception of the short period when filamentous growths invaded the activated sludge. The chlorine residual and total coliform violations might have been avoided if the chlorination and sulfanation equipment was reliable. Inadequate sludge and scum removal from the secondary clarifiers, by the very nature of the bio-masa, will exert a BOD and cause an increase in suspended solids by gasifi- cation which will beireflected in the effluent. The traveling bridges on the final clarifiers stop approximately 8 feet from the in- let where mixed liquor flows into the tank. Consequently a scum mat floats on the surface where the skimmers can't reach, most likely a dead spot on the floor of the tank also exists. Mr. Baker and his crew have installed a two inch (dia.) perforated plastic pipe down into one of the tanks, hooked up an air supply to it, created a slight turbulence, and eliminated the dead spot areas. With added sludge digestion capacity, use of the emergency storage ponds during periods of upset conditions, repair or replacement of unreliable equipment, and continued surveilance of industrial waste dishargers, the limits established by Board Order No. 77-182 could be met continously. Mr. Baker and the operation and maintenance personnel at this plant should be com- mended for their diligence and dedication in the performance of duties at this very difficult to operate and maintain sewage treatment facility. n/ ,4 FRANK MCDERMOTT, Staff Engineer FOM/ap 2/6/79