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3.2.2 Action Levels Personnel on the Site will use personal protective equipment (PPE) meeting USEPA Level D (modified) protection, as described in Section 5.1 of this H&S plan. If sustained direct-reading (Section 4.1) measurements occur,work will be halted as defined in Table 1. Sampling activities will be relocated to a new area and allowed to resume. If the results of continued monitoring exceed the levels established in Table 1, or it becomes necessary to return to an area where sampling was discontinued,the Site Personnel will enter the area(in USEPA Level C)and obtain a sample of the contaminated soil and air for laboratory analysis to determine the exact nature of contaminants. Based on the results of this analysis, the action levels established in Table 1 may be changed via an amendment to this H&S plan. In the unlikely event that persons inside the work zone are required to wear Level C respiratory protection, periodic monitoring at the downwind perimeter of the work zone will be performed to ensure that downwind personnel breathing zone levels do not exceed those defined in Table 1 of this H&S plan. 3.3 Confined Space Entry No confined space entry is anticipated as part of the field activities. All trenches/cavities onsite shall be considered confined spaces and shall be entered only following the protocols identified in the OSHA confined space entry regulation (Title 8, CCR, Article 108), 29CFR 1910.146. There are two types of confined spaces: non-permit required confined space and permit-required confined space. Non-permit required confined space is defined as a confined space that does not contain or, with respect to atmospheric hazards, have the potential to contain any hazard capable of causing death or serious physical harm (Title 8 CCR 5157(b)). Permit required confined space (permit space) refers to a confined space that has one or more of the following characteristics: 1. Contains or has a potential to contain a hazardous atmosphere; 2. Contains a material that has the potential for engulfing an entrant; 3. Has an internal configuration such that an entrant could be trapped or asphyxiated by inwardly converging walls or by a floor which slopes downward and tapers to a smaller cross-section; or 4. Contains any other recognized serious safety or health hazard. According to Title 8 CCR 5157(b), a hazardous atmosphere refers to an atmosphere that may expose employees to the risk of death, incapacitation, impairment of ability to self-rescue, injury or acute illness from one or more of the following causes: 1. flammable gas, vapor or mist in excess of 10 percent of its lower flammable limit (LFL); ENV,': 8 February 2005 A M E R I C A PAPG&E\PGE-05-01 Stockton MW26R Investigation\MW26 Work Plan\H&S\H&S Plan-2005Aoc