Company: CLH
Filing Date: 2025-02-19
Form Type: 10-K
Source: 0000822818-25-000007
Chunk: 214

Company: CLEAN HARBORS INC
Filing Date: 2025-02-19
Form: 10-K
Item: Item 1
Chunk 214
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 management's estimate of expansion airspace, the amortization rates used for the units-of-consumption method would change, therefore impacting the Company's profitability.As of December 31, 2024, the Company had eight active landfill sites (including the Company's non-commercial landfill), which have estimated remaining lives (based on anticipated waste volumes and the remaining highly probable airspace) as follows: Facility NameLocationRemainingLives(Years)Permitted Remaining Highly Probable Airspace(cubic yards) (in thousands)ButtonwillowCalifornia214,909 Deer TrailColorado171,347 Grassy MountainUtah374,253 KimballNebraska22520 LambtonOntario, Canada464,218 Lone MountainOklahoma132,913 RyleyAlberta, Canada405,594 SawyerNorth Dakota613,197   26,951 At December 31, 2024 and 2023, the Company had no cubic yards of permitted, but not highly probable, airspace. 

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Table of ContentsCLEAN HARBORS, INC. AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

The following table presents the remaining highly probable airspace from January 1, 2023 through December 31, 2024 (in thousands of cubic yards):20242023Remaining capacity, beginning of year27,753 28,270 Changes in highly probable airspace, net— 464 Consumed(802)(981)Remaining capacity, end of year26,951 27,753 In the year ended December 31, 2023 the Company received a permit for expansion of its Kimball, Nebraska landfill. Amortization of cell construction costs and accrual of cell closure obligations—Landfills are typically comprised of a number of cells, which are constructed within a defined acreage (or footprint). The cells are typically discrete units, which require both separate construction and separate capping and closure procedures. Cell construction costs are the costs required to excavate and construct the landfill cell. These costs are typically amortized on a units-of-consumption basis, such that they are completely amortized when the specific cell ceases accepting waste. In some instances, the Company has landfills that are engineered and constructed as "progressive trenches." In progressive trench landfills, a number of contiguous cells form a progressive trench. In those instances, the Company amortizes cell construction costs over the airspace within the entire trench,