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- C <br /> L <br /> tract ; ( 2 ) by absorption through the skin or <br /> through cuts and punctures and (3) by <br /> inhalation through the respiratory system. <br /> The respiratory system not only presents the <br /> quickest and most direct avenue of entry into <br /> the body, but for many agents the lungs are <br /> also ' the critical target . Airborne <br /> contaminants include solid and liquid <br /> particulate matter and gaseous material , <br /> whether a true gas or vapor, or a combination <br /> of these. <br /> C <br /> r ; <br /> b. Oxygen-deficient atmospheres - Air normally is <br /> 20 . 9 ' percent oxygen by volume . Current <br /> legislation requires that oxygen percentage in <br /> L a workplace be not less than 19 . 5 percent. <br /> Oxygen concentrations below 16 percent are <br /> considered unsafe to humans . Oxygen-deficient <br /> L atmospheres can occur when air is displaced by <br /> L gases and vapors or where there are oxidation <br /> processes such as fire, rusting, aerobic <br /> Ir, bacterial action, etc. <br /> o Any facia I hair lying between the sealing surface <br /> of a respirator facepiece and the wearer ' s skin <br /> t that willprevent a good seal shall not be allowed. <br /> This includes stubble, a moustache , side-burns, or <br /> a beard that extends outward between the face and <br /> II� L. the sealing surface of the respirator. <br /> �• o Workers with pereforated ear drums shall not wear <br /> respirators . <br /> o Contact lenses shall not be permitted while wearing <br /> a respirator . <br />� L o Gum and tobacco chewing shall not be permitted <br /> while wearing a respirator. <br /> j <br /> L 9 . 0 MEDICAL SURVEILLANCE PROGRAM <br /> All site workers entering the area must have taken an <br /> I �I annual medical,` examination as part of the medical <br /> surveillance program as required in CFR 29 1910 . 120 <br /> HAZWOPER. <br /> L10 . 0 SAFETY MEETINGS <br /> Project supervisor will schedule and hold a safety <br /> meeting for all employees, including sub-contractors <br /> prior to beginning work each day . Minutes of each meeting <br /> session must be kept . <br /> j 8 <br /> L / <br /> L <br />