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3/25122, 9:42 AM Table of Contents road -20210930 inherently uncertain. Key assumptions in estimating future cash flows include sales price, volumes and expected profit margins, net of capital requirements. The present value of the projected net cash flows represents the fair value assigned to mineral reserves and mineral interests. The discount rate is a significant assumption used in the valuation model and is based on the required rate of return that a hypothetical market participant would assume if purchasing the acquired business. Management applies fair value measurement guidance to its impairment analysis for tangible and intangible assets, including goodwill. Property, Plant and Equipment Property, plant and equipment are initially recorded at cost or, if acquired as a business combination, at fair value and depreciated on a straight-line basis over their estimated useful lives. Leasehold improvements for operating leases are amortized over the lesser of the term of the related lease or the estimated useful lives of the improvements. Mineral reserves and mine development costs, including stripping costs incurred during the development stage of a mine, are depleted in accordance with the units -of -production method as aggregates arc extracted, using the initial allocation of cost based on proven and probable reserves. Routine repair and maintenance costs are expensed as incurred. Asset improvements arc capitalized at cost and amortized over the remaining useful life of the related asset. The estimated useful lives of property, plant and equipment categories are as follows: Category Estimated Useful Life Land and improvements Land, unlimited; improvements, 15-25 years Mineral reserves Buildings Plants Construction equipment Furniture and fixtures Based on depletion 5 - 39 years 3 - 20 years 3 - 10 years 5 - 10 years Leasehold improvements The shorter of 15 years or the remaining lease term Management periodically assesses the estimated useful life over which assets are depreciated, depleted or amortized. If the analysis warrants a change in the estimated useful life of property, plant and equipment, management will reduce the estimated useful life and depreciate, deplete or amortize the carrying value prospectively over the shorter remaining useful life. The carrying amounts of assets sold or retired and the related accumulated depreciation are eliminated in the period of disposal, and the resulting gains and losses are included in the Company's Consolidated Statements of Comprehensive Income during the same period. Impairment of Long -Lived Assets The carrying value of property, plant and equipment and intangible assets subject to amortization is evaluated whenever events or changes in circumstances indicate that the carrying amount of such assets, or an asset group, may not be recoverable. Events or circumstances that might cause management to perform impairment testing include, but are not limited to, (i) a significant decrease in the market price of an asset, (ii) a significant adverse change in the extent or manner in which an asset is used or in its physical condition, (iii) an accumulation of costs significantly in excess of the amount originally expected for the acquisition or construction of an asset, (iv) an operating or cash flow performance combined with a history of operating or cash flow losses or a forecast that demonstrates continuing losses associated with the use of an asset, and (v) an expectation that an asset will be disposed of significantly before the end of its previously estimated useful life. If indicators of potential impairment are present, management performs a recoverability test and, if necessary, records an impairment loss. If the total estimated future undiscounted cash flows to be generated from the use and ultimate disposition of an asset or asset group is less than its carrying value, an impairment loss is recorded in the Company's Consolidated Statements of Comprehensive Income, measured as the amount required to reduce the carrying value to fair value. Fair value is determined in accordance with the best available information based on the hierarchy described under "Fair Value Measurements" above. For example, the Company would first seek to identify quoted prices or other observable market data. If observable data is not available, management would apply the best available information under the circumstances to a technique, such as a discounted cash flow model, to estimate fair value. Impairment analysis involves estimates and the use of assumptions in connection with judgments made in forecasting long -tern estimated inflows and outflows resulting from the use and ultimate disposition of an asset, and determining the ultimate useful lives of assets. Actual results may differ from these estimates using different assumptions, which could materially impact the results of an impairment assessment. 51 https://www.sec.gov/Archives/edgar/data/0001 718227/000171822721000107/road-20210930.htm 91/144