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The document outlines a practice reported by Chevron U.S.A. Production Company to replace methane-rich natural gas used for blanketing water storage tanks with produced CO2-rich gas. This conversion prevents the formation of explosive mixtures in tanks while reducing the venting of methane into the atmosphere. A specific implementation across nine units at a water treatment plant resulted in an annual saving of 32,600 thousand cubic feet of methane gas. The document notes that while CO2-rich gas is a better alternative, it can form acid when dissolved in produced water, necessitating internal tank lining to prevent corrosion.