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3. All confined spaces must be checked before entry. If you are unsure, call the Safety Monitor. <br /> Confined Space Procedures for Underground Construction <br /> There are three classes of Confined Space: <br /> • Class 1: "Safe for Entry without Further Danger": where pre-entry testing and procedures <br /> show the space safe for entry, and location and/or nature of the work in the space will not <br /> cause any further hazards. <br /> • Class 2: "Safe for Entry with Caution": pre-entry procedures and testing show the space <br /> safe for entry but where location and/or the nature of the work could conceivably cause some <br /> hazards to workers inside. <br /> • Class 3: Those that are "Unsafe for Entry", where pre-entry procedures and testing shows <br /> the space contaminated or lacking sufficient oxygen. DO NOT ENTER. <br /> Class I Procedures <br /> 1. Disconnect or block off any lines which could carry dangerous substances into the space_ <br /> Make the disconnection in a way that it cannot be accidentally reconnected. If disconnection <br /> of incoming lines can't be done, the Safety Monitor will test for confined space entry. DO <br /> NOT ENTER THE SPACE until it has been cleared for entry by testing. <br /> 2. Test the air for contamination and oxygen deficiency. The testing device must have a probe <br /> or hose capable oftesting the space without entry, have an audible or visual alarm, as well as a <br /> numerical read-out, and be able to test for the following: <br /> A. Toxici - The tester must be able to numerically read out parts per million(PPM) <br /> concentrations of hydrogen sulfide"(H S), and ppm concentration of combustible gases and <br /> vapors. <br /> B. Flammability- The tester must be able to numerically read out the percent of the lower <br /> explosive limit(LEL) of gases and vapors. <br /> C. Oxygen Content - The tester must be able to read out the percent of oxygen present in s <br /> the atmosphere. <br /> Test the air for all the above at various levels and locations in the space. Heavier than air vapors <br /> may form dangerous, and even explosive concentrations close to floor or at a leaking valve that <br /> are not apparent at the top of the space or at the access. Record all measurements, even if they <br /> are zero or within safe limits. <br /> If the testing shows that the space is uncontaminated and has sufficient oxygen, and if your <br /> evaluation of the work to be done in the space shows that it could not cause any hazards, record <br /> the space as"Safe for Entry Without Further Danger." <br /> 2 <br />