COMPLIANCE INFO_FILE 2 - Laserfiche WebLink

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REPRODUCED AT GOVERNMENT EXPENSE. I is Soil samples will be collected during the tank removal and soil excavation. The excavations shall be shored and left open while laboratory analysis of soil and ground water samples are being completed. Barricades shall be placed around the excavation at a distance sufficiently far back from the edge of the excavation to minimize erosion, caving, and sloughing of the excavation from vehicle traffic. If water is present after the tank is removed, the excavations shall be partially backfilled with the excavated soil to above water to minimize sloughing and caving potential. 3.1.1 Excavation for Trenches: Shall be to the elevations and dimensions required to remove the existing piping. Keep excavations free from water while construction is in progress. Notify the Contracting Officer immediately in writing if it becomes necessary to remove hard, soft, weak, or wet material to a depth greater than indicated. Store excavated soil not closer than two (2) feet to the edge of the excavation. Excavations deeper than 5 feet shall be shored, or have side slopes of 1 vertical to 3/4 horizontal. 3.1.2 Excavation for Tank Removal: Shall be to the contours and dimensions required to remove the tanks. Keep excavations free from water while construction is in progress. Provide shoring and sheeting as required to prevent injury to persons and damage to structures and as required by applicable Federal, State and Local laws. Also, arrange shoring and sheeting to preclude injurious caving during removal. 3.1.3 Barricades: When excavation is over five (5) feet deep, provide suitable barricades for worker protection. When work area is left open and unattended by the Contractor, provide suitable barricades and or covering materials for public safety regardless of excavation depth. 3.1.4 Exits: For trenches and excavations over four (4) feet deep, provide suitable exit means in accordance with applicable provisions of Occupational Safety and Health Administration. 3.2 TRENCH BACKFILLING: Place the backfill in 8 -inch maximum loose lifts unless otherwise specified. Compact each loose lift as specified in Paragraph "General Compaction" before placing the next lift. Do not backfill in freezing weather, where the material in the trench is already frozen or is muddy, except as authorized. Where unacceptable settlements occur in trenches and pits due to improper compaction, excavate to the depth necessary to rectify the problem, then back fill and compact the excavation as specified herein and restore the surface to the required elevation. 3.3 TANK CAVITY BACKFILLING: Backfill for the tank cavity shall be placed in lifts of 8 -inches thick and each lift shall be compacted as specified herein, before the overlaying lift is placed. 3.4 GENERAL COMPACTION: Use hand -operated plate type vibratory or other suitable hand tampers in areas not accessible to larger rollers or compactors. Be careful to avoid damaging pipes and protective pipe coatings. Compaction shall be in accordance with the following unless otherwise specified. If necessary, the Contractor's selected equipment and 12-88-3458 02203-3