Excavators and cranes generate engine and hydraulic oil. How contractors sell it to licensed recyclers via BioTradX.
Site vs depot
Do not store open barrels on a monsoon site. Move to the depot tank. List the depot pin code, not the shifting site.
Hydraulic vs engine
Separate IBCs. Water from leaking coolers is the usual hydraulic defect. State it honestly or the first lab cut will surprise you.
Contractor EHS
Large EPC contracts already ask for hazardous-waste vendors. A marketplace invoice is easier to file than a kachha receipt.
Book pickup
Monthly litres by oil type on BioTradX. Align with service camps when many machines are in one city.