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【简答题】
某公司以BT方式总承包建设消纳量为200t/d的大型城市垃圾填埋场工程，地点位于城郊山坳。防渗层为HDPE单层防渗结构，聚乙烯膜上保护层为无纺土工布，膜下保护层为压实土基。聚乙烯膜由建设方指定厂商供应。施工项目部编制了防渗层施工方案。渗出液依地势排入邻近的污水处理厂，进水井为跌水方式，水面落差5.0m，采用预制沉井法施工。在当地建设主管部门检查中，项目部未能提供沉井专项方案论证表。运输垃圾和渗出液异味引发了附近居民抱怨。防渗层施工方案应包括哪些主要内容？
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