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PID readings exceeding 250ppm in 'the workers breathing zone will <br /> require work stoppage and site evacuation. An explosion proof <br /> fan may be used to vent the wort; area. <br /> pFCONTAMINATION: . <br /> During all field operations, care will be taker// minimize <br /> contact with soils and groundwater. Drilling spoils and <br /> developmental water will be stored on--site for proper treatment <br /> or disposal. This will minimize contact and dispersion of <br /> potentially contaminated materials. <br /> If necessary, upon exit from the work site, loose debris will be <br /> remived from protective clothing by brushing or rinsing.' Gloves <br /> and boots will be decontaminated in a 5% solution of trisodium <br /> Phosphate and rinsed with water which will be disposed on on- <br /> site. Respirator cartridges, per-filters, inner gloves and <br /> coveralls will be placed in a drum on-site for disposal. No one <br /> will exit the site with contaminated clothing or equipment. <br /> RECORD KEEPING: <br /> All site safety records pertaining to the site characterization <br /> study will be maintained by the Safety Coordinator/ProJect <br /> Manager throughout the project. <br /> Air Monitoring: <br /> The Safety Coordinator will conduct periodic air monitoring <br /> using direct reading sampling equipment as required. At a <br /> minimum the following monitoring wiI.l be performed .: <br /> 1•: ombus a nd V Hors: Potentially explosive <br /> concentrations of gases and vapors will be monitored at <br /> least once every 15 minutes during sampling activites .using <br /> a combustible gas meter. If at any time the concentration <br /> exceeds 20% of the lower explosive limit (LPL) activities <br /> will stop and the area will be evacuated until gas levels <br /> have been reduced to :.t <br /> less than 20%.__of...the <br /> ... <br /> : LL_ancl he. <br /> _of combugtible_gases or_ <br /> vapors has: been determined - - <br /> 2• Qtal drgunic Vapnr5_ A direct reading photoionization <br /> detection (PID) meter (Hnu PI 101 ar equivalent) will be <br /> used to monitor the: concentrations of organic vapors in the <br /> work area. . Measurements will be taken at least `once every. <br /> 15 minutes during surface and subsurface sample collection. <br /> . The meter will be calibrated for " benzene.. . Total organic <br /> vapor;mensurements will be used to dstermino the appropriate <br /> levels of . respiratory protection. and conditions .for site <br /> evacuation. Total organic vapor concentrationsin the <br /> workers breathing zone in excess of loppm above background <br /> will trigger an upgrade from level D to ;level C protection. <br /> Breathing zone` concentrations in excess of 250 ppm will stop: <br /> the work on-site until the work zone concentration's are <br /> reduced to .below. 250ppm. <br />