4.2 In case of different waste types are mixed when delivered, or if the waste has different characteristics and/or properties from the waste sample and/or is different from the specification in the quotation, BWG reserves the right to reject and return such waste to the client immediately or both parties may revise service fee and BWG will inform the new rate to client. If both parties can not find an agreement on the new price within three working days of BWG from which the client is informed, BWG has the right to reject and return such waste to the client immediately. The client is responsible for the cost of analysis and round-trip transportation of waste as BWG sees appropriate.