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evaluated using a direct-reading photoionization detector (PID) equipped with a 10.2 electron volt probe; measurements will be made at the top of the monitoring well and in the operators breathing zone. All measurements shall be recorded in the field logbook. The frequency or need for continued sampling will be based on results from initial measurements. Justification for discontinuing measurements shall also be recorded in the field logbook. The SSO shall be responsible for interpreting monitoring data and upgrading or downgrading the level of protection during field activities according to the following guide: Response Criteria For Airborne Vapor Concentrations (measured at breathing zone level) READING LEVEL OF PROTECTION 0 ppm or Background (as measured up-wind of sampling location) Level D Background— 10 ppm above background >I0 ppm up to 100 ppm above background Level D w/continuous monitoring >100 up to 300 ppm above background Level C >300 ppm above background Stop OperationsMove Up-Wind Note: Readings exceeding 500 ppm at a wellhead—suspend sampling activities until conditions can be further assessed. If corrective action cannot be taken, site personnel must remain up-wind or move to a predetermined safe area and contact the Consulting CIH. The PID shall be calibrated both before and after field operations, or more frequently as deemed necessary by the Project Manager or SSO. The instrument will be calibrated and maintained in accordance with the manufacturer's instructions. The calibration gas and the calibration readings (in ppm equivalent) shall be recorded in the field log book. It should be noted that high humidity environments can cause a PID instrument to indicate lower organic vapor concentrations than actually exist. Stockton 6-Lane,Task Order No.82 Caltrans Contract 06A1141,EA 10-03A1001 Project No.S9200-06-82 - 13 - December 2009