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11 <br /> SIERRA <br /> If the surface seal is less than 5 feet thick, the grout will be poured from the surface The <br /> resulting seal will be checked for shrinkage within 24 hours and additional grout will be added, <br /> if necessary The surface seal is used to prevent infiltration of surface water into the well <br /> The monitoring well(s) is locked with a stovepipe or cap and covered with a traffic-rated <br /> vault if it is located in a developed area The well I D is clearly marked on the cap or casing <br /> MWDEEP SOP <br />