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"mushroom cap" may be hazardous to the safety of personnel and equipment. For this reason, the <br /> "mushroom" cap is not safe or necessary in most situations. Safety regulations require shoring of <br /> excavations deeper than 5 feet. Extreme safety precautions should be used around an excavation of this kind <br /> if the "mushroom" cap is to be poured, as experience indicates that soil in the annulus around the casing <br /> may be unstable. Cutting off the easing at a lesser depth than 5 feet may be warranted in such a situation, <br /> along with emplacement of sealing material to a minimum depth of 20 feet. With this treatment, the <br /> "mushroom" cap is not recommended. <br /> Disposal of Fluids and Solids <br /> Disposal of fluids and solids resulting from well destruction operations should be accomplished in <br /> accordance with applicable local and regional ordinances and regulations relative to "Best Management <br /> Practices (BMP)". <br /> Records of the materials and well destruction procedures are normally required by regulatory agencies, and <br /> their requirements should be adhered to. It is always useful to survey the location using a GPS system, so <br /> that a location of a destroyed''well may be recovered if a problem of contamination (for example) should <br /> arise in the future. This is especially true in areas of special concern or contamination. Possibly, a method of <br /> visual identification such as a marker or ID tag that could be placed at the well location (or above it, if top <br /> of casing is below ground)would be useful in recovering the location at a late-date. <br /> Adopted by the CGA Board of Directors on January 17,2004 <br /> Revised by the CGA Board of Directors on April 27, 2013 <br /> ARTICLE 299—DESTRUCTION OF WATER WELLS —Page 6 of 8 (Revised 4/27/2013) <br />