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TABLE 3-27. .,..:.:..AIA MONITORING fREOIJENCY GUIDELINES r Conduct periodic monitoring when: (1)It is possible that an IDLt••1 condition or a flammable atmosphere has developed or (2) there is an Indication that exposures may have risen over.'permissible exposure limits or published exposure levels since the last monitoring. Look for a possible rise in exposures associated with these situations: ' Change in Sibs Area-work begins on a different pection of the site Change in Corrtaminants-handling contaminants other than those first identified Change in On-Site Activity-one operation ends and another begins - Handling Lmkng Dmims or Corrtaimrs 1 Warlarg with Obvkxn Liquid Contamination (e.g,a spill or lagoon) ; Conduct air monitoring when the possibility of volatilization exists (such as with a new monitoring well or a well containing known product). Conduct air monitoring on a well at a site known to have little contamination (documented by experience or laboratory data), arty if an odor emanates from the well. 3.2.Confined Space Entry Procedures and Permit Siteywork may require personnel to enter-confined spaces. No Groundwater Technology employee or II subcontractor shall enter an area identified as a confined space without using the confined space I I entry procedures described in Table 3-3 and the site specific entry procedures presented in Table 3-4. The purpose of the confined space entry procedure is to protect employees from potentially hazardous environments and to facllitate immediate rescue in an emergency situation. A Confined Space Entry Permit must be posted at the entrance to each confined space. ::TABLE:3-3 .. . .. ::...:: CON FJNED::SPAGES ....:,.,. :. Definition . Pits or open-topped tanks that are more than four Leet (1.2M) deep,or any other enclosed space that Is not designed for continuous employee oxupancy. El amples`.:..:,. ..... Excavation pits,trenches,storage tanks,subsurface vaults,basements,silos,manholes,and sewers Characteristics ■ Limited access and egress ■ Limited natural ventilation Not designed for human occupancy Prottocol for Confined Space Entry Perform the appropriate air monitoring activity at various depths in the space prior to entry. Monitor for. (1)oxygen EI level, (2)flammable vapors,and (3)toxic vapors. Ventilate the atmosphere in the space so that entry may.be made safely without respiratory protection. If this is not feasible,appropriate respiratory protection must be worn by authorized entrants and attendants. • Wear respiratory protection when ventilation alone can not achieve acceptable atmospheric levels ot.P on or 1I• fiammable or toxic vapors. GROIr , r l I TECHNOLOCY