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Are the 30-inch access openings adequate in the locations where two pumps are <br />provided? <br />Where only one pump is provided for a particular function, what happens when it <br />, fails? _There should be a standby unit in every case. <br />4 We are veryconcerned that the proposed clarifier will not work. It is apparently <br />planned to pump flows in and out. It appears that quiescent settling conditions <br />will not be provided and that there will be no Sludge collection mechanism. We <br />would expect the sludge to build up around a "rat hole" at the return sludge , <br />pump. The sludge could build up to the point that it will be drawn into the clarifier • <br />- effluent pump and/or will become septic We would also expect direct short- <br />circuiting of s.ettling- mixed liquor solidi into the clarifier effluent pump. • _ - - • <br />. Mixed liquor solids leaving the clarifier will be deposited in the disinfection _ <br />compartment, Where they will build up. ,Whafp'rovisions'are being made to clean , , . <br />this tank? <br />The schematic flow diagram is unclear, particularly as regards flows from the 03 <br />tank to the filters- and/or effluent tank. <br />7. There are no apparent facilities for settling, decanting, and removing sludge from <br />the digester. <br />. There is inadequate space in the building, particularly as regards maintenance , • space around the blowers. <br />We believe further review of the *posed system, including review of electrical and <br />instrumentation drawings, is Unwarranted until the issues indicated above are _- <br />addressed., Additionally, we Would like to know- if this type of system has been used <br />elsewhere, and whether ithas been successful. ' <br />Please do not hesitate to call if you wish to discuss these matters further. - Alternatively; <br />" if you desire, we can "meet with you and/or others as appropriate.. <br />Sincerely, <br />ECO:LOdIC 'Engineering <br />Jeffrey R. Habser <br />LO