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a <br /> t,r <br /> A) Combustible Gases ay..1. Vaors <br /> .N Potentially explosive concentra'.ions of gases and vapors <br /> will be monitored at least once every 15 minutes during <br /> 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 20* of the LEL and the source of combustible gases or <br /> vapors has been determined. <br /> 8) Total Organic Va ors <br /> A direct reading photoionization detection (PIA) meter (HNU <br /> PI 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 /> during surface and subsurface sample collection. The meter <br /> will be calibrated with isobutylene. Total organic vapor <br /> measurements will be used to determine the appropriate <br /> levels of respiratory protection and conditions for site <br /> evacuation. Total organic vapor concentrations in the <br /> workers breathing zone in excess of 10 ppm above background <br /> will trigger sampling for benzene with a direct reading <br /> colormetric tube. Breathing zone concentrations in excess <br /> of 500 ppm will stop the work on-site until the work zone <br /> concentrations are reduced to below 500 ppm. <br /> C) RESPIRATORY PROTECTION <br /> If total organic vapors exceed 10 ppm in additional sampling <br /> for benzene will be performed using direct reading <br /> '-' colormetric tubes. If benzene concentrations exceed 10 <br /> Personal protection will be increased to Level C. ppm <br /> EMPLOYEE TRAINING AND INFORMATION <br /> -- Prior to site activity, WaterWork will conduct training for all <br /> sii:e 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 /> `1 <br /> i.r <br />