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<br />? <br />WESTERN RESERVE ENGINEERING & SURVEYING COMPANY <br />SEWER ENTRY PROCEDURE <br />1. GENERAL DISCU5SION <br />Sewer entry differs in two vital respects from other permit entries; first, there rarely <br />exists any way to completely isolate the space (a section of a continuous system) to be <br />entered; second, because isolation is not complete, the atmosphere may suddenly and <br />unpredictably become lethally hazardous (toxic, flammable or explosive) from causes <br />beyond the control of the entrant or employer. <br />A. Adherence to procedure. <br />W. R. E. S. designates as entrants only employees who are thoroughly trained in <br />these sewer entry procedures and who demonstrate that they follow these entry <br />procedures exactly as prescribed when performing sewer entries. <br />B. Atmospheric monitoring. <br />Entrants should be trained in the use of, and be equipped with, atmospheric <br />monitoring equipment which sounds an audible alarm, in addition to its visual <br />readout, whenever one of the following conditions is encountered: oxygen <br />concentration less than 19.5 percent or more than 23.5 percent: flammable gas <br />or vapor at 10 percent or more of the lower explosive limit (LEL); or hydrogen <br />sulfide or carbon monoxide at or above PEL (10 ppm or 35 ppm, respectively); <br />or, if a broad range sensor device is used, at 100 ppm as characterized by its <br />response to its hydrocarbon calibration source. <br />C. Entry Coordination. <br />Sewer crews should develop and maintain liaison, to the extent possible, with the <br />local weather bureau and fire and emergency services in their area so that sewer <br />work may be delayed or interrupted and entrants withdrawn whenever flammable <br />or other hazardous materials are released into sewers during emergencies by <br />industrial or transportation accidents. <br />II POTENTIAL HAZARDS <br />The employees could be exposed to the following: <br />A. Engul, finent. <br />Attachment D