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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 />