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NOTE: All air monitoring equipment must be calibrated as per manufacturer's instructions. Table 4-1 Site Air Monitoring Requirements Site Activity Instrument Frequency Location Caution Drilling Activites PID Every 15 minutes or 5 In breathing zone of Communicate with feet of penetration person nearest equipment operator activity before sampling CGI Every 15 minutes or 5 In work area near Communicate with feet of penetration activity equipment operator before sampling Air monitoring results obtained from the breathing zone during field activities will be recorded in field logbooks and the Air Quality Monitoring Record(see Appendix C). All such records will also include the location,date/time,weather conditions,person monitored,background concentration, and identification of specific contaminant whenever possible. Air monitoring information will be utilized to evaluate personnel exposure and assess the appropriateness of PPE for Site conditions.The PPE for the Site are discussed in Section 4.2. Photoionization detector(PID), combustible gas indicator(CGI), and detector tube readings measured in the employees breathing zone will be used to determine the level of protection required. PID readings refer to readings above background,which are sustained for at least 5 minutes and are measured during the performance of field tasks. PID readings are used for general screening. 4.2 Action Levels for Personal Protection Equipment The first and foremost means of protecting employees from injuries or exposures is to eliminate the exposure. The general hierarchy for controlling potential exposures is: (1)Engineering Controls;(2) Administrative Controls; and(3)the use of PPE. PPE is a means of preventing injury or exposure when exposure elimination and/or other control means are not feasible. The initial level of protection and the Action Levels at which the PPE will be upgraded are determined based on the identification of specific chemicals expected to be present at a Site and the established OSHA Permissible Exposure Levels(PEL)or ACGIH Threshold Limit Values(TLVs),whichever is lower. In the event more than one chemical is expected or exists at a Site,the most hazardous chemical will dictate the level of personal protection required. Table 4-2 shows the action levels for levels of personal protection equipment. Table 4-2 Action Levels for Personal Protection Equipment Monitoring Action Level Equipment Hazard Above Action Background PID/FID Organic < 10 ppm Level D. gas/vapor 10 to 50 ppm Level C. Move upwind and continue air monitoring, cease operations, or use detector tube(s)for (contaminant)and reference Table 4-3 below. 20160613 Stockton, March Ln 2016 HASP 5-7 6/13/16)