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Project No. 014-94276 t Page No. 10 will be This required.q is is considered a conservative approach since the Drager®detector tubes may respond to several hydrocarbons other than benzene. Table 1 summarizes the various hydrocarbon vapor concentration and appropriate responses to prevent exposure to these potential vapor hazards. TABLE 1 HYDROCARBON VAPOR CRITERIA AND RESPONSES i HYDROCARBON CONCENTRATIONS RESPONSE = <50 ppmv TVH Limited hazard, no special action. 50-100 ppmv TVH General Work Areas Half-mask OV Respirators worn by all potential exposed in work area. 50-1400 ppmv TVH General Work Areas Half-mask OV Respirators worn by all potentially exposed in work area. Benzene detector tube measurements taken each 15 minutes until levels below 1 p m. >1400 ppmv TVH General Work Areas Work stops; procedures taken to subdue excessive and/to well head emissions vapor levels. > i ppmv Benzene at Breathing zone Half-mask OV Respirators worn by all potentially exposed in work area. Benzene detector tube measurements taken each 15 minutes until levels below 1 ppm, ppmv = parts per million vapor i TVH Total Volatile Hydrocarbons OV — Organic Vapor 5.0 PERSONAL PROTECTIVE CLOTHING/E_UTIPMENT RE NT 4 jThis section specifies personal protective clothing/equipment required for the various tasks to be performed during this investigation. Table 2 summarizes these requirements. s 5.1 Dili gQp_qrations Respiratory Protection: All field personnel ill be required to have available for use, a properly fit tested half-mask air purifying respirator with organic vapor cartridges and particulate pre-filters. These will be required to be worn based on the criteria listed in Section 4.0. �i KRAZAN & ASSOCIATES, INC. Offices Serving the Western U iited States 94276.HSP I