NOVELTY - The system comprises a first bunker of a first type waste constituents, a second bunker of a second type waste constituents, a first densifier, a grinder, a second densifier, and a control unit. The first bunker of first type waste constituents is separated from a mixed municipal solid waste stream. The second bunker of second type waste constituents is separated from the mixed municipal solid waste stream. The first type waste constituents are different from the second type waste constituents based on a bulk density and/or a chemical composition of the waste constituents.    USE - The system is useful for producing engineered fuels from a municipal solid waste, where the fuels are useful for turbines.    ADVANTAGE - The system economically and effectively produces the engineered fuels without environmental pollution.    DETAILED DESCRIPTION - The system comprises a first bunker of a first type waste constituents, a second bunker of a second type waste constituents, a first densifier, a grinder, a second densifier, and a control unit. The first bunker of first type waste constituents is separated from a mixed municipal solid waste stream. The second bunker of second type waste constituents is separated from the mixed municipal solid waste stream. The first type waste constituents are different from the second type waste constituents based on a bulk density and/or a chemical composition of the waste constituents. The first densifier is configured and disposed to receive the waste constituents from the bunkers and to compress the first type waste constituent, the second type waste constituents and a chemical additive such as a sorbent to form a densified intermediate material. The grinder is configured and disposed to receive the densified intermediate material from the first densifier and to grind the densified intermediate material. The second densifier is configured and disposed to receive the ground intermediate material from the grinder and the second type waste constituents from the second bunker and to compress the ground intermediate material and the second type waste constituents to form a densified engineered fuel feed stock. The ground intermediate material has an average particle size of less than one quarter inch. The first type waste constituents include a hard plastic and a mixed plastic. The second type waste constituents include a soft plastic and a fiber. The control unit is: configured to control a rate of withdrawal of a first amount of the first type waste constituents from the first bunker based on an information associated with a british thermal unit (BTU) content of the waste constituents of the first type and with the chemical composition of the first type waste constituents; and configured to control a rate of withdrawal of a first amount of the second type waste constituents from the second bunker based on an information associated with a BTU content of the waste constituents of the second type and with the chemical composition of the second type waste constituents. An INDEPENDENT CLAIM is included for an engineered fuel feed stock.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a system for producing an engineered fuel feed stock.    Material classification subsystem (220)    Primary shredder (230)    Secondary shredder (235)    Eddy current separator (245)    Fuel feed stock production subsystem. (280)