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k` ■ KLEINFELDER <br /> i <br /> for Vessel#2 will also be valuable topredict the mediative effects of ozone outside the radius of <br /> active sparging and potentially that which is dissolved and carried downgradient in groundwater, <br /> 4.8 SITE SAFETY <br /> �. 4.8.1 Emergency Shutdown Procedures <br /> Though not anticipated, in the event of an emergency condition, the entire system will be shut <br /> down. The shutdown succession will involve switching off the main electrical breaker to the <br /> system as soon as it is safe to do so. The emergency shutoff location will be clearly marked at the <br /> site. If fire, chemical release, excessive equipment temperature, or electrical malfunction prevent <br /> access to shutoff locations, all personnel will leave the site and notify appropriate emergency <br /> personnel immediately. <br /> 4.8.2 Hazardous Conditions <br /> r <br /> The pilot test equipment and the performance of the pilot test can present potential hazardous <br /> conditions for personnel. The compressor and blower units if not properly installed and handled <br /> ' can produce an electric shock hazard or burn hazard. The extraction of contaminated soil gas can <br /> produce breathing hazards if piping is not properly fitted and sealed. A PID will be used to <br /> routinely(at least hourly) monitor the breathing zone in the test area while personnel are present. <br /> If a measurable concentration is measured on the PID the system will be inspected for leaks and <br /> repaired. If 5 ppm or more is measured in the breathing zone the system will be shut down and <br /> personnel will leave the area until it is safe to diagnose the problem. <br /> The ozone generator also presents potential hazards to personnel. The National Institute for <br /> Occupational Safety and Health (NIOSH) indicate a safe breathing limit for ozone of 0.1 m <br /> p Y � ) g pp <br /> in <br /> the compound is immediately dangerous to life and health at 10 ppm. To ensure safety, all <br /> personnel will be required to wear personal ozone monitors (see Section 4.2) and ozone will be <br /> f continuously monitored at the site while personnel are present and as personnel are approaching <br /> the site. In addition, 0.075 to 0.105 ppm ozone test strips will be permanently placed at all <br /> monitoring well heads to check for undesirable levels of ozone gas escaping from nearby wells. <br /> In levels above 0.1 ppm are recorded in the breathing zone at the site or in nearby monitoring <br /> wells, and a system leak is not detected, the ozone delivery rate and/or flow in the sparge wells <br /> will be reduced to remedy the situation. <br /> I <br /> In addition to gaseous ozone hazards, groundwater in the nearby monitoring wells may contain <br /> enough dissolved ozone to irritate or burn the skin if exposed during sampling operations. <br /> Nitrile gloves will be worn during any handling or sampling of groundwater within 200 feet of <br /> the ozone sparge well, and groundwater will not be sampled until the ORP reads between 1,000 <br /> and -1,000 mV. <br /> 1228012002R476 Page 22 of 26 <br /> Copyright 2002 Kleinfelder,Inc. May 17,2002 <br />