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4. Refuse The landfills contain household refuse, demolition debris, tree trimmings, and miscellaneous refuse. To the best knowledge of the Owner, hazardous materials have not been disposed at the site. However, material that is currently defined as hazardous waste, such as paint, insecticides, etc., may have been included in household waste disposed at the site. The Owner does not certify that hazardous materials were excluded at all times from disposed refuse. Potential hazards associated with the direct contact with refuse include biological infection and contact with household hazardous waste. 5. Disposal of Excavated Refuse Complying with regulations regarding exposed refuse is of the essence in this contract. Contractor shall remove refuse excavated during drilling or other activities to the active working face of the landfill, and shall deposit it as directed by landfill operations personnel. The Contractor shall remove excavated refuse and residual refuse from the landfill surface, and deliver this refuse to the active landfill face by 3:00 p.m. of the day in which the refuse was excavated. The Contractor shall cover refuse not delivered to the active face by the time identified with 10 mil plastic or equivalent, and shall secure the edges of the cover to the satisfaction of the Engineer. Refuse covered by plastic shall be removed to the active landfill face by 10:00 the next day. Workers will be allowed on site to deliver plastic -covered refuse to the active face on Saturday mornings, if so requested by the Contractor. Such activity will not be counted as a working day. 6. Open Trenches and Uncompleted LFG Well Bore Hole Contractor shall cover open trenches in which refuse is exposed by a tarp and cordon the work area with safety cones and caution tape at the end of the work day. Contractor shall backfill trenches containing refuse within 24 hours of initial excavation. Access to the site during Saturdays or Sundays will not be allowed for the purpose of backfilling trenches. Contractor shall place 8'x4'x Y2" inch thick sheet of plywood with weights may be placed over uncompleted LFG well boreholes. The drilling auger may also be left in the borehole with its top covered. E. Documents On Site Contractor shall maintain a complete set of contract documents on site. Contract documents include signed contracts, Standard specifications book, construction drawings and specifications associated with each maintenance task. On -Call LFG System Maintenance Contractor San Joaquin County Purchasing Department