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(1991) has determined that PCBs may reasonably be anticipated to be <br /> carcinogens. This is based on animal studies. Studies in workers do not provide <br /> enough information to know with any certainty if PCBs cause cancer in humans. <br /> 4.2 PHYSICAL HAZARDS <br /> Physical hazards are those typically associated with general construction. Slips, trips, and falls <br /> are of primary concern in accident prevention. The contractor will exercise care to maintain <br /> good housekeeping practices within the work area. The excavation will be closed off with <br /> caution tape and barricades when work is not in progress. <br /> 4.2.1 Heavy Equipment <br /> The more severe potential.for accidents will be related to the use of heavy equipment. During <br /> well closure activities, trucks, and steam cleaning equipment will be used. All heavy equipment <br /> used on this project will be in good working order and operated in accordance with recognized <br /> industry standards and Cal-OSHA Title 8, Subchapter 4, Construction Safety Orders. Safety <br /> maintenance checks of all equipment shall be conducted just prior to the start of each workday. <br /> Employers and workers at the Site shall comply with all Cal OSHA requirements including <br /> personal protection, safety, training, and safety planning rules. Activities that pose imminent <br /> hazard to Site personnel will not be permitted. All cables, slings, and locks will be inspected <br /> daily by the contractor to insure that they are in safe working order. <br /> 4.2.2 Excavation of Uplifted Areas <br /> Two locations east of the CSMS are planned to be explored by excavating with a backhoe. The <br /> areas have exhibited unexplained uplifting of pavement. No chemicals are known to be present <br /> in either location, and no metallic objects are located beneath either location. However, because <br /> of the unknown, and potentially expansive nature of the underground in these two locations, the <br /> following precautions will be made. No work is planned in the area suspected to contain buried <br /> tear gas canisters. <br /> • Operators and personnel will be stationed up wind of any excavation, and an exclusion <br /> zone of 20 feet will be maintained around each excavation until a determination of the <br /> hazard is made. <br /> • Air monitoring for organic vapors will be performed during the excavation, using a PID <br /> • On Site emergency medical personnel will be notified of the nature of the work, and will <br /> be available for emergency response at the time of field work <br /> 3028-03/114700.4766.023/.Nr?3'03 11 <br />