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• Tetraethyl lead, an organic form of lead, can cause diseases of the central nervous system, the kidneys, and the blood Skin absorption of this compound is a major route of entry into the body, however, it can also be inhaled as a constituent of dust. Care should be taken to avoid inhalation of and contact with dust on UST sites. The OSHA exposure limit is 0 075 mg/m3 of air while the ACGIH exposure limit is 0 1 mg/m3. 2.3 PHYSICAL HAZARDS Physical hazards vary in type and number among the tasks related to UST operations, and ~not all of the described physical hazards are necessarily present during individual UST related projects. However, it is reasonable to expect that some combination of these hazards will be present, and therefore will be discussed in the plan. Most of these hazards have specific Standard Safety Procedures that will be attached on a site-by-site basis SSPs can be obtained through the RSC and/or the HSD. The weather presents a variety of physical hazards that will vary from season to season, and must be addressed accordingly High temperatures frequently present the potential for heat stress When conditions exist for potential heat stress, an appropriate heat stress monitoring program must be ;included in the plan, and must be implemented and documented on site Warmer weather also presents the possibility for thunderstorms and lightning UST projects requiring the use of drill rigs, cranes, backhoes, and similar equipment will be shutdown in the event of thunderstorms Cold weather presents yet a different group of hazards including the potential for hypothermia, frost bite, freezing liquids and surfaces, faulty monitoring equipment, and metal stress. Appropriate precautions for cold weather operations will be made part of this plan. Heavy equipment is involved in most aspects of UST closures and site characterizations. When such equipment is operated by SEACOR or a SEACOR subcontractor, appropriate inspections and operating guidelines shall be employed as discussed in relevant operating practices. When work details require the use of hand tools and power hand tools caution and good judgment must be employed. In addition to general health hazard by way of electric shock and physical injury, power hand tools can act as ignition sources during UST operations. Electrical hand tool use requires utilization of Ground Fault Circuit Interrupters or establishment of an assured ground program Hot work such as the cutting or welding of tanks is not covered under the plan If these activities are required, an approved amendment to this plan is necessary. Similarly, the plan does not cover any form of confined space entry either into a tank or excavated areas. UST closure and installation will require varying degrees of excavation Physical hazards encountered during the excavation process range from moving heavy machinery to sloping and shoring concerns of the excavation itself. SEACOR personnel or their subcontractors are not permitted to enter any unsecured excavation. Excavations and trenches must comply with OSHA's standard (29 CFR 1926 651/652). if it is necessary that an excavation or trench be entered, the provisions of the OSHA standard must be fully implemented A competent person must inspect all trenches and excavations prior to entry or commencement of work nearby Prior to excavation a full utility search must be conducted I Rev 4/93 2-3 corp-h&slbl,aiikL,sc h&S