Supplier shall keep and maintain sufficient accounting books, records, receipts, and related documents (collectively, “ Records ”) related to its supply of Sand to Customer so as to establish adequate performance under, and compliance with, the terms, conditions and obligations of this Agreement.  The Records shall be maintained in accordance with commonly accepted accounting and oilfield industry practices. Supplier shall retain the applicable Records for a period of three (3) years following completion of each order, or for such longer period as may be required by applicable law, and for so long thereafter as a known dispute may exist between the Parties. Customer and its designated representatives shall have the right during reasonable business hours to inspect, copy and audit the Records of Supplier pertaining to Supplier’s supply of Sand to Customer, and the Parties’ performance, compliance and payment obligations hereunder.