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背景材料： 某公路隧道长3000m，穿越的岩层主要由页岩和砂岩组成，设计采用新奥法施工，分部法开挖，复合式衬砌，洞口段由于洞顶覆盖层较薄，岩隙发育，开挖中地表水从岩石裂隙中渗入洞内，在施工过程中，隧道发生过规模不等的塌方。在隧道施工中，施工单位认真做好了四个方面的防尘工作。 （1）根据背景材料，在处理隧道塌方前要做哪些调查，确定处理方案？ （2）根据背景材料，隧道塌方后的治理应该如？ （3）背景中提到施工单位认真做好了四个方面的防尘工作，请问是哪四个方面？
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