Draft revisions to the US Environmental Protection Agency's Lead and Copper Rule propose creating a 10 μg/L trigger level of lead concentration in addition to the action level.

中文翻译：

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检查建议的铅和铜规则触发水平

美国环境保护局《铅和铜规则》的修订草案提议，除了采取行动标准外，还应创建10μg/ L的铅浓度触发水平。