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30 TAC 331 ,~63 _ • III IIIIIIIII IIII III http://yrw.mrccsmie.tx.us/RuleSAac/30/1/331/1/331.163.html Title 30. ENVIRONMENTAL QUALITY ~ ~ DOC• lVa wt ~ : U~e ~ ~ ~ Part I. TEXAS NATURAL RESOURCE CONSERVATION COMMISSION Chapter 331. UNDERGROUND INJECTION CONTROL Subchapter J. STANDARDS FOR CLASS I SALT CAVERN SOLID WASTE DISPOSAL WELLS § 331.163 Well Construction Standards (a) Plans and specifications. Except as specifically required in the terms of the disposal well permit, drilling and completion of the well shall be done in accordance with all permit application plans and specifications. Any proposed changes to the plans and specifications must be approved in writing by the executive director that said changes provide protection standards equivalent to or greater than the original design criteria. (b) Casing and cementing. (1) All Class I salt cavern disposal wells shall be cased and all casings which extend to the surface shall be cemented to the surface to prevent the movement of fluids into or between underground sources of drinking water (USDWs) or freshwater aquifers, and to prevent potential leaks of fluids from the well. Cementing shall be by the pump and plug or other method approved by the commission, and cement circulated shall be of a volume equivalent to at least 120% of the calculated volume needed to fill the annular space between the hole and casing and between casing strings to the surface of the ground. Circulation of cement may be accomplished by staging. The executive director may approve an alternative method of cementing in cases where the cement cannot be recirculated to the surface, provided the owner or operator can demonstrate by using logs that the cement is continuous or does not allow any fluid movement behind the well casings. Casing and cement used in [he construction of each newly drilled well shall be designed for the life expectancy of the well, including the post-closure care. (A) Surface casing shall be set to a minimum subsurface depth, as determined by the executive director, which extends into a confining bed below the lowest formation containing a USDW or freshwater aquifer. (B) At least one string of intermediate casing, using a sufficient number of centralizers, shall extend at least l00 feet into the salt stock. (C) At least one long string casing, using a sufficient number of centralizers, shall extend into [he salt stock, to the following depths, whichever is greater: (i) 500 feet into the salt stock; or (ii) 500 feet below any rock type of recognizable thickness as determined by logging, which is different from salt, and that is hydraulically connected to formations outside the salt stock. For the purposes of this rule, all rock types of recognizable thickness on logs which are different from salt shall be assumed [o be in hydraulic connection unless demonstrated otherwise. I o(5 4/18/99 12:58 PM