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_ ... .. <br />in Aart K of this plan to make the 'seals as air tight as possible. <br />This permanent type stopping shall be installed between the intake <br />and return aircourses in the entries. Stoppings shall be erected <br />and maintained to and including the third connecting crosscut outby <br />- . <br />the faces of the entries. Mandoors are to be instal bed at least <br />- - <br />every 400 feet. ~ - <br />b. A drawing of a permanent stopping is shown in Figure 2. <br />H. Diesel Equipment <br />The following requirements are included in the plan: <br />1. Comply completely with the manufacturer's operating instructions and <br />maintenance manuals. <br />2. The atmosphere in the operator's compartment shall be sampled daily <br />with the engine running; and, if the analyses of these samples exceed <br />five parts per million NOZ or fifty parts per million of carbon mono- <br />xide or both, corrective measures must be taken immediately. <br />` 3. The atmosphere returning from any working place where diesel-powered <br />equipment is being used shall be tested at least once each shift while <br />the equipment is in operation and, if the analyses of the-se examples <br />exceed five parts per million NOZ or fifty parts per million CO or <br />both, corrective measures shall be taken immediately. <br />4. The date, time of sampling, machine identification and the analyses <br />obtained will be recorded in a book maintained for this purpose. <br />I. Use of Auxiliary Fans and Machine-Mounted Diffusers Underground <br />The auxiliary fans used are a permissible type, kept in permissible condi- <br />'~tion, and inspected at least every four (4) hours when in use. A record <br />of the date, time of examination and the examiner's initials will be kept <br />on the fan. Air current reaching the fan is to be greater than the free <br />discharge capacity of the fan. Recirculation of air through the fan will <br />not be permitted. <br /> <br />•• -11- <br />