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Project No S8080-06-01 July 7, 1994 Operations must also be suspended if the OVA readings go off scale at the instruments highest range setting (i e , 1,000 ppm), thus indicating a potentially explosive condition If corrective action cannot be taken, field personnel and other individuals in the area must be directed to move to a safe area The CHSS and PM must also be contacted The OVA shall be calibrated before and after field operations and as deemed necessary during field operations The instruments will be calibrated with the calibration gas recommended by the instrument's manufacturer The calibration gas and the calibration readings (in ppm-equivalent) will be recorded in the field log book It should be noted that the OVA-FID hydrogen flame can extinguish in low oxygen environments In addition, high humidity environments can cause an OVA-PID instrument to indicate lower organic vapor concentrations than actually exist The SSO shall be responsible for interpreting monitoring data and upgrading or downgrading the level of protection required during field activities Personal Protective Equipment The level of protection required during the field activities will be dependent upon onsite conditions (e g ,results of ambient air monitoring) The EPA has formulated recommended levels of protection to be implemented under varying site conditions The EPA levels of protection are divided into levels A, B, C, and D These levels are used as a starting point for selection of personal protective equipment levels, however, personal protective equipment levels will be specified according to site conditions in order to provide the most appropriate level of protection It is recommended that Level D protection measures be implemented prior to the initiation of the field investigation activities This levet shall be upgraded to Level C (i e , limited respiratory protection) should ambient air monitoring readings (as outlined above) exceed 5 ppm Page II