SITE INFORMATION AND CORRESPONDENCE

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%Nov V A) � Combustible Gases and Vapors Potentially explosive concentrations of gases and vapors will be monitored at least once every 15 minutes during sampling activities using a combustible gas meter. If at any time the concentration exceeds 20% of the lower explo- sive limit (LEL), activities will stop and the area will be evacuated until gas levels have been reduced to less than 20% of the LEL and the source of combustible gases or vapors has been determined. B) Total Organic Vapors A direct reading photoionization detection (PTD) meter (HNU PI 101 or equivalent) will be used to monitor the concentra- tions of organic vapors in the work area. Measurements will be taken at least once every 15 minutes during surface and subsurface sample collection. The meter will be calibrated with isobutylene. Total organic vapor measurements will be used to determine the appropriate levels of respiratory protection and conditions for site evacuation. Total organ- ic vapor concentrations in the workers breathing zone in excess of 10 ppm above background will trigger sampling for benzene with a direct reading colormetric tube. Breathing zone concentrations in excess of 500 ppm will stop the work on-site until the work zone concentrations are reduced to below 500 ppm. C) Respiratory Protection If total organic vapors exceed 10 ppm in additional sampling for benzene will be performed using direct reading colormet- ric tubes. If benzene concentrations exceed 10 ppm, person- al protection will be increased to Level C. EMPLOYEE TRAINING AND INFORMATION Prior to site activity, WaterWork will conduct training for all site personnel without a previous documented hazardous waste training course. The training will have the following objec- tives: Ensure that workers are aware of potential hazards they may encounter.