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A) Combustible Gases and Vapors <br /> Potentially explosive concentrations of gases and vapors <br /> will be monitored at least once every 15 minutes during <br /> G' sampling activities using a combustible gas meter. If at <br /> any time the concentration exceeds 20% of the lower <br /> explosive limit (LEL), activities will stop and the area <br /> will be evacuated until gas levels have been reduced to less <br /> than 201 of the LEL and the <br /> vapors has been determined. source of combustible <br /> gases or <br /> 4.1 <br /> B) Total manic Ka ors <br /> A direct reading photoionization detection (PID) meter (HNU <br /> P1 101 or equivalent) will be used to monitor the <br /> concentrations of organic vapors in the work area. <br /> Measurements will be taken at least once every 15 minutes <br /> 1 during surface and subsurface sample collection. The meter <br /> will be calibrated for benzene. Total organic vapor <br /> measurements will be used to determine the appropriate <br /> _. levels of respiratory protection and conditions for site <br /> evacua';ion. Total organic vapor concentrations in the <br /> workers breathing zone in excess of 10 ppm above background <br /> will trigger an upgrade from level A to level C protection. <br /> ^� Breathing zone concentrations in excess of 250 ppm will stop <br /> the work on-site until the work zone concentrations are <br /> reduced to below 250 ppm. <br /> EMPLOYEE TRAINING AND INFORMATION <br /> ` Prior to site activity, WaterWork will conduct training for all <br /> site personnel without a previous documented hazardous waste <br /> training course. The training will have the following <br /> objectives: <br /> ° Ensure that workers are aware of potential hazards <br /> they may encounter. <br /> ° Provide the knowledge and skills necessary to <br /> perform the work with m'nimal risk to workers <br /> health and safety. <br /> ° Familiarization with the Site Safety plan and <br /> ----site-specific--requirements. - -- -- - - --- ---- --- <br />