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Required Communication with <br />Those Charged with Governance (Continued) <br />Significant Accounting Estimates: Significant estimates affecting the <br />financial statements include: <br />• Estimate of the useful lives of <br />capital assets used to compute <br />depreciation expense <br />• Liability for postretirement benefits <br />other than pensions <br />• Estimate of the net pension liability <br />• Estimate of the loss reserves for <br />worker's compensation <br />• Landfill closure and postclosure <br />costs liability <br />N&K CPAs, Inc. <br />