Cal. PRC § 3151
This is the official text of Cal. PRC § 3151, part of California’s Public Resources Code — covers environmental protection, state parks, and natural resource management.
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Official statutory text
“Base fluid” means the continuous phase fluid used in the makeup of a well stimulation treatment fluid, including, but not limited to, an acid stimulation treatment fluid or a hydraulic fracturing fluid. The continuous phase fluid may include, but is not limited to, water, and may be a liquid or a hydrocarbon or nonhydrocarbon gas. A well stimulation treatment may use more than one base fluid.
Status: in_force · Read it on the official government site
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