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concentrations. Those individuals using respirators will follow a site specific change out schedule, ' 1 r which be developed on site. The change out schedule will depend on the air concentrations present, the duty of the work (hard or light labor), and number of hours of exposure, temperature, and -� humidity. 8.3 LEVEL C OPERATIONS rrlThe use of Level C protection at the Frontier Transportation property is not anticipated. Previous air monitoring on-site has identified no significant concentrations of benzene vapors with f a photo-ionization detector (PID), which was identified in free product on groundwater at the site. 1 Nevertheless, Level C protection shall be implemented in areas where task-specific air monitoring indicates that the action level of 1 ppm as BTEX with a PID. Air monitoring will be performed in the breathing zone every five minutes. It is not anticipated that this level of air contamination will be present during remediation activities at the site. Level C protective clothing will consist of the general protective gear plus air purifying respirators with organic vapor cartridges. In addition, personnel will wear surgical inner gloves, Nitrile outer gloves, nuke booties and tyvek or saran- coated tyvek coveralls (depending on moisture or splash hazard). Airborne dust will not be of l concern at this site. C: J A photoionization detector (PID) will be used on-site to monitor the air quality for BTEX. The PID will be calibrated with isobutylene. The action level for the use of air purifying respirators will be set at 1 ppm as benzene. The action level will be inputted into the PID in alarm mode. The f JI PID will be within ten-feet of on-site operations . The PID will continuously monitor the air quality and sound an alarm when action levels are exceeded. To further protect site workers from possible 1 ( s) exposure, a rigorous cartridge exchange program will be enforced. Organic vapor/acid gas cartridges will be used in all respirators. All personnel undergo annual respiratory protection training in January of each year. 8.4 LEVEL B OPERATIONS I The use of Level B protection at the Frontier Transportation property is not anticipated. L However, Level B protection shall be used when BTEX air monitoring concentrations exceed 5 ppm for a 15-minute period. Level B shall consist of all personnel protective equipment described above lin Level C operations with the substitution of a pressure demand SCBA with full face piece. i . ; The above levels of protection will be utilized during initial field operations. Upon receiving j -1 data from air, soil and water sampling, these levels of protection will be re-evaluated to provide !: . sufficient employee protection while maximizing productivity. A situation may be present in which Level C respiratory protection is utilized while Level D clothing is used. Criteria for downgrading �J personnel protective equipment during field activities will be laboratory results indicating no potential for exposure above the Permissible Exposure Level (PEL) for any site contaminant. j" 9.0 SITE CONTROL 9.1 SITE SECURITY jNo one will be allowed to enter a site work area unless they have been given permission to do so by the Project Manager and the Site Safety Officer, and otherwise follow applicable portions of this HASP. All work areas are secured with a chain linked fence which will be kept locked at all times. 8 ��I