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DECONTAMINATION During all field operations, care will be taken to minimize contact with soils and ground water. Drilling spoils and developmental water will be stored on-site for proper treatment or disposal. This will minimize contact and dispersion of potentially contaminated materials. If necessary, upon exit from the work site, loose debris will be removed from protective clothing by brushing or rinsing. Gloves and boots will be decontaminated in a 5 percent solution of trisodium phosphate and rinsed with water which will be disposed of on-site. Respirator cartridges, per-filters, inner gloves and coveralls will be placed in a drum on-site for disposal. No one will exit the site with contaminated clothing or equipment. EMERGENCY RESPONSE If the potential exists for fire, explosion or toxic material release during on-site activities, prior to commencement of any activities, personnel will have available telephone numbers and contacts for emergency response assistance including: • Ambulance • Fire Department • Hospital • Poison Control Center • Community Evacuation Contact Emergency equipment on-site will include: • Portable eyewash bottles • Industrial first-aid kit SITE SECURITY Access during all on-site activities will be restricted to authorized personnel. All personnel and authorized visitors must contact the Safety Coordinator/Project Manager prior to entering and exiting the site. RECORD KEEPING All site safety records pertaining to the site characterization study will be maintained by the Safety Coordinator/Project'Manager throughout the project. AIR MONITORING The Safety Coordinator/Project Manager will conduct periodic air monitoring using direct reading sampling equipment as required. At a minimum the following monitoring will be performed: Total Organic Vapors A direct reading photoionization detection (PID) meter (HNU PI 101 or equivalent) will be used to monitor the concentrations 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 for benzene. Total organic vapor measurements will be used to determine the appropriate levels of respiratory protection and conditions for site evacuations. Total organic vapor concentrations in the workers' breathing zone in excess of 10 ppm above background will trigger an upgrade from level D to level C protection. Breathing zone concentrations in excess of 250 ppm will stop the work on-site until the work zone concentrations are reduced to below 250 ppm. 2