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https://www.federalregister.gov/documents/2026/04/13/2026-07061/hazardous-and-solid-waste-…

…ither the federal MCL or background concentration, for two consecutive sampling events, consistent with §§ 257.95(e) and (h). Additionally, the owner or operator must include documentation that the system meets a subset of performance standards at §§ 257.91(a) through (e), 257.93…