SITE INFORMATION AND CORRESPONDENCE

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Air Surveillance - A program must be established for routine, periodic air surveillance to detect changes which could jeopardize site personnel . Surveillance can be conducted in many ways : various types of air pumps and filtering devices followed by analysis of the filtering media; portable real-time monitoring instruments located strategically on site; personal dosimeters; and periodic walk-throughs by personnel carrying direct-reading instruments . 10 . 6 . 4 Decision-Logic for Selecting Pro -active Clothing - No adequate criteria like the respiratory protection decision-logic are available for selecting protective clothing. A known substance concentration in the air approaching a TLV or permissible exposure limit for the skin does not automatically warrant a fully encapsulating suit . A hooded, high quality, chemical-resistant suit may provide adequate protection. The selection of Level A over Level B is a judgement that should be made by a qualified individual considering the following factors: The physical form of the potential contaminant . Airborne substances are more. likely to contact personnel wearing non- encapsulating suits, since such suits are not considered to be gas or vapor tight. - Effect of the material on skin: - highly hazardous substances are those that are easily - absorbed through the skin and cause systemic effects, or that cause severe skin destruction. Skin contact with liquids is generally more hazardous than contact with vapors, gases and particulates . less hazardous substances are those that are not easily absorbed through the skin and therefore do not cause systemic effects, or that do not cause severe skin destruction. - Concentration of the material . The higher the concentration, the higher the risk of harm. The potential for contact with the material due to work function and the probability of direct exposure to the small area of skin unprotected by Level B or C chemical-resistant clothing. 10-14