The Los Angeles County Department of Public Works is seeking bids for a trailer-mounted water pump with a 4-9 inch capacity. The pump must be self-priming, have a diesel engine, and meet specific noise reduction requirements. The bid includes the provision of a sound-attenuated enclosure, work lights, and a toolbox. The vendor must also provide a pre-delivery inspection and instruction on the proper operation and maintenance of the system. • The pump must be capable of static suction lifts to 28 vertical feet at sea level. • The pump must be fitted with a fully automatic priming system incorporating a twin-cylinder compressor and air ejector assembly. • The pump must be capable of running totally dry for periods up to 24 hours. • The pump must be supplied with an integral flap type check valve mounted on the discharge flange of the pump. • The pump casing must be made of cast iron and constructed to prevent rusting. • The pump impeller must be of open three-bladed, non-clog type with pump out vanes on the back shroud and fabricated hardened cast chromium steel construction.