Rate of gst applicable on digging borewell along with giving pumpset and installing it

Hi all,

My father was awarded with state government work where he had to dig borewells for the economically backward classes, energising it, giving submersible pumpset along with items like pipe and fittings and movable pump house.

Please let me know what percent of gst would attract the entire work.

As i feel it is composite kind of work and not work contract and principle supply would be supply of service that is digging borewell, it should attract with 0% gst