Firstly, you will not be informed or alerted before a compliance-based inspection. The person leading that inspection will simply show up, ask for the person in charge of your facility, and commence the audit. This can happen at any time.
Because these kinds of inspections can happen without warning, you must be absolutely certain that you comply with all relevant regulations and rules—at all times. Never wing it. Have a thorough, researched hazardous waste management plan, and be diligent about ensuring all employees follow that plan. From using the right hazardous waste label to ensuring you’re using the proper containers, this plan should cover every possible contingency.