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C. Where two strata containing poor-quality water,pollutants,or contaminants are separated by a stratum <br /> to be protected,the annular space opposite the stratum to be protected,the confining strata underlying <br /> and overlying the stratum to be protected, and the upper stratum containing poor-quality water, <br /> pollutants, or contaminants shall be sealed off. <br /> The supplementary seals described in the cases above shall be extended up to and contact the base of the <br /> required minimum annular surface seal described in Section 7 above, if they are otherwise required to be <br /> within 10 feet of the surface seal. Sealing the entire annulus above the anode interval will often economically <br /> fulfill the conditions outlined above. <br /> Requirements for sealing materials and their placement are described in Section 7, above. <br /> Section 11. Repair of Cathodic Protection Wells. <br /> Materials used for repairing cathodic protection well casing shall meet the requirements of Section 9, above. <br /> Section 12. Temporary Cover. <br /> The well or borehole opening and any associated excavations shall be covered at the surface to prevent the <br /> entry of foreign material,water, pollutants, and contaminants, and to ensure public safety whenever work is <br /> interrupted by such events as overnight shutdown,poor weather and required waiting periods to allow setting <br /> of sealing materials and the performance of tests. The cover shall be held in place or weighted down in such <br /> a manner that it cannot be removed except by equipment or tools. <br /> -70- <br />