You can buy an ORENCO system, but I think a simple alarm bell, 115 volts, and one high level float to actuate it is better and thousands cheaper.
As to a dosing pump, your engineer must have specified one, as the head pressure is critical if you are pumping into a small pipe distributor.
I would consider a outlet filter and an Orenco screen pump chamber. They have a new one with a special screen that really keeps solids out of your bed, which kills it over time.
If its low head, I like zoeller pumps.