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Site Safety Plan August 20, 1990 Former Exxon Station No. 7-1050, Stockton, California AGS 30045-15 The Health and Safety Coordinator or Branch Safety Officer will explain Applied GeoSystems' Respiratory Protection Program to each new employee who must wear a respirator. The employee will be asked whether or not he or she understands the information provided. If the Company physician has cleared the employee for respirator use and the Health and Safety Coordinator or Branch Safety Officer has checked the fit of the respirator then the employee will be issued a respirator. A written record is signed and dated by the employee and Health and Safety Coordinator or Branch Safety Officer and kept in the new employee's Safety Record, WORK ZONES AND SECURITY MEASURES The Project Manager will call Underground Services Alert (USA) and the utilities will be marked before any drilling is conducted onsite and the borings will be drilled at safe distances from the utilities. The client will also be advised to have a representative onsite to advise us in selecting locations of borings with respect to utilities or underground structures. Applied GeoSystems assumes no responsibility for utilities not so located. The First 5 feet will be hand augered before any drilling equipment is operated. Each of the areas where the borings will be drilled will be designated as Exclusion Zones. Only essential personnel will be allowed into an Exclusion Zone. When it is practical and local topography allows, approximately 25 to 75 feet of space surrounding those Exclusion Zones will be designated as Contamination Reduction Zones. Cones, wooden barricades, or a suitable alternative will be used to deny public access to these Contamination Reduction Zones. The general public will not be allowed close to the work area under any conditions. If for any reason the safety of a member of the public (e.g., motorist or pedestrian) may be endangered, work will cease until the situation is remedied. Cones and warning signs will be used when necessary to redirect motorists or pedestrians. EXPOSURE MONITORING PLAN It is not anticipated that project personnel exposure will exceed the TLVs or PELs of the materials; however, proper personal protective equipment will be worn while working at the i site. In addition, the work area will monitored using a direct-reading combustible gas analyzer or an organic vapor meter to detect the concentration of the volatile hydrocarbons i in the ambient atmosphere. If the lowest TLV or PEL is consistently being exceeded in the breathing zone, then a respirator must be worn. If the concentration exceeds 1,000 parts per million (ppm), the use of a respirator is inappropriate and personnel must withdraw from the site. 12 App//ed GeoSystems _