Briefly describe the components of a hearing conservation program. Summarize the pros and cons of different types of hearing protection devices. Your response must be at least 200 words in length. Briefly explain the following concepts related to exposure thresholds: time-weighted average, short-term exposure limit, exposure ceiling, and biological exposure indices. Your response must be at least 200 words in length Summarize the similarities and differences between confined spaces and permit-required confined spaces, and give at least three examples of each. Summarize the duties of personnel involved in the performance of a permit-required confined-space entry. Your response must be at least 200 words in length. 29 CFR 1926 Subpart CC requires that workers understand the crane safety training they are provided. Suggest some ways to ensure understanding is achieved. How can workers’ understanding be verified? Your response should be at least 75 words in length. Discuss the differences between shields, shoring, and sloping in the context of protective systems used in excavation. How is the appropriate system selected? Your response should be at least 75 words in length. What is the purpose of conducting an engineering survey prior to a demolition project? Describe and discuss the major components of an engineering survey for the demolition of a two-story wood structure. Your response should be at least 200 words in length. Discuss the site evaluation steps that should be taken before starting an excavation project. Which step(s) are likely to contribute the most in preventing excavation injuries? Your response should be at least 200 words in length.