Dear Sir
Plz refer the relevant Section 68 of the CGST Act read with Rule 138 of the CGST Rules, 2017:
138. Information to be furnished prior to commencement of movement of goods and generation of e-way bill.-
(1) Every registered person who causes movement of goods of consignment value exceeding fifty thousand rupees-
(i) in relation to a supply; or
(ii) for reasons other than supply; or
(iii) due to inward supply from an unregistered person,
shall, before commencement of such movement, furnish information relating to the said goods as specified in Part A of FORM GST EWB-01, electronically, on the common portal along with such other information as may be required on the common portal and a unique number will be generated on the said portal:
So you need to generate E-way bill, if the consignment value of waste and scrap goods exceeds Rs. 50,000/- for movement of every shipment as per law.