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F.Tem~orarv Cover. The well or borehole opening and any associated excavations shall be <br />covered at the surface 10 ensure public safety and to prevent the entry of foreign material, <br />water, pollutants, and contaminants; whenever work is interrupted by such events as overnight <br />shutdown, poor weather, and required waiting periods to allow setting of sealing materials and <br />the performance of tests. The cover shall be held in place or weighted down in such a manner <br />that it cannot be removed, except by equipment or tools. <br />.~.~~.-54-