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7. Additional backfill material shall be placed on top of the trench to accommodate <br />settlement. <br />8. No placing of backfill material shall be performed when the air temperature is continuously <br />below 30 degrees Fahrenheit unless authorized by the Owner/Engineer. <br />3.05 TREATMENT OF THE TOP OF THE SLURRY TRENCH CUTOFF WALL <br />A. Temporary Protective Layer. A 2 foot temporary protective layer of excess slurry shall be placed <br />over the top of the backfill mixture, after the backfill reaches the top of the slurry trench and before <br />drying out of the backfill can occur. <br />B. Final Protective Layer. The Contractor shall not cap the slurry wall until approved by the <br />Owner/Engineer. Excavation for the final slurry trench shall not be accomplished until that portion <br />of the completed trench has been in place a minimum of 7 days, except for the areas where traffic <br />access must cross the wall. <br />3.06 EXCESS SLURRY DISPOSAL <br />Excess slurry shall be disposed of off-site at a permitted disposal facility, or onsite by methods approved of <br />by the Owner/Engineer. Disposal of the slurry shall comply with all Federal, State, and Local laws and <br />regulations. Under no circumstances shall slurry escape to nearby drainage courses, sewers, wetlands, or <br />detention basins.