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单项选择题

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多项选择题

对施工过程水污染的防治，正确的有（）。

A.工地临时厕所、化粪池应采取防渗漏措施
B.化学用品、外加剂等要妥善保管，库内存放，防止污染环境
C.施工现场50人以上的临时食堂，污水排放时可设置简易有效的隔油池
D.施工现场搅拌站废水，现制水磨石的污水，最好是经沉淀池沉淀合格后，将沉淀水用于工地洒水降尘或采取措施回收利用
E.有毒有害废弃物作土方回填