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v ..J Level B PPE. A quarter or half-face air purifying respirator can be used for airborne PCB concentrations below 5 mg/ml. A full-face respirator can be used for airborne PCB levels not exceeding 25 mg/ml will require an upgrade to Level B PPE. When the workplace atmosphere has been characterized, this information, along with data on the toxicity of the contaminants present, will be used to determine the level of PPE required in the work area. It is not Avalon's policy to have its staff perform work requiring Level B protection. If it is determined that conditions warrant Level B protection, work will stop until the contractor's previous experience conducting drilling, sampling or removal operations in Level B protection is verified or until training for Level B work is given to contractors by qualified personnel and until Avalon determines if a separate subcontractor will be retained to conduct Level B operations or whether to have the current contractors conduct the operations with ESC maintaining an oversight role (observing from outside the immediate work zone). The PID will be calibrated at least once at the start of each operating day or when the instruments supply erratic readings. In case of a malfunction, backup equipment will be delivered to the site. Calibration procedures are given in Appendix H. 8.1 Personal Protective Equipment Level C personal protective equipment (PPE) for the Won's Cleaners site (if necessary) will consist of the following equipment: • dual cartridge full-face air purifying respirator (NIOSH approved) • organics, dust, and pesticide respirator cartridges (MSA cartridges GMA- H, GMC-H, GMC-S) • Tyvek or Saranex-coated Tyvek coveralls • steel-toed work boots • PVC surgical or latex gloves (to protect from direct dermal contact with PCE in site soil; dermal absorption of solvents is an insignificant exposure pathway as liquid solvents are not present in site soils.) • hard hats, required when heavy equipment is being used Level D PPE will consist of the same items as those for Level C. Respirators, Tyveks, outer booties and PSVC surgical or latex gloves will be available but Avalon Environmental Consultants 9627-001-6 Kashmar Singh Joes Truck Plaza January 9,2001 12 Lathrop,California