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§1723.2 OIL AND GAS TITLE 14 (p. 94.14.14.14) (Register as,No.22--6.28.w) (d) Bridge Plug. A bridge plug above the lowermost zone in a multiple- zone completion may be allowed in lieu of cement through that zone if the zone is isolated from the upper zones by cement behind the casing. NOTE:Authority cited:Sections 3013 and 3106,Public Resources Code.Reference:Sec- tion 3228,Public Resources Code. HISTORY: 1. Amendment filed 9-21-76; effective thirtieth day thereafter (Register 76,No.39). 2. Amendment filed 12-28-84;effective thirtieth day thereafter (Register 84,No.52). 1723.2. Plugging for Freshwater Protection. (a) Plugging in Open Hole. (1) A minimum 200-foot cement plug shall be placed across all fresh-saltwa- ter interfaces. (2) An interface plug may be placed wholly within a thick shale if such shale separates the freshwater sands from the brackish or saltwater sands. (b) Plugging in a Cased Hole. (1) If there is cement behind the casing across the fresh-saltwater interface, a 100-foot cement plug shall be placed inside the casing across the interface. (2) If the top of the cement behind the casing is below the top of the highest saltwater sands, squeeze-cementing shall be required through perforations to protect the freshwater deposits. In addition, a 100-foot cement plug shall be placed inside the casing across the fresh-saltwater interface. (3) Notwithstanding other provisions of this section,the district deputy may require or allow a cavity shot immediately below the base of the freshwater sands. In such cases, the hole shall be cleaned out to the estimated bottom of the cavity and a 100-foot cement plug shall be placed in the casing from the cleanout point. (c) Special Plugging Requirements. Where geologic or groundwater con- ditions dictate,special plugging procedures shall be required to prevent con- tamination of usable waters by downward percolation of poor quality surface waters,to separate water zones of varying quality,and to isolate dry sands that are in hydraulic continuity with groundwater aquifers. NOTE:Authority cited:Sections 3013 and 3106,Public Resources Code.Reference:Sec- tions 3106 and 3228, Public Resources Code. HISTORY: 1. Amendment filed 9-21-76;effective thirtieth day thereafter (Register 76, No.39). 2. Amendment filed 12-28-84;effective thirtieth day thereafter (Register 84, No.52). 1723.3. Plugging in at a Casing Shoe. If the hole is open below a shoe,a cement plug shall extend from at least 50 feet below to at least 50 feet above the shoe. If the hole cannot be cleaned out to 50 feet below the shoe, a 100-foot cement plug shall be placed as deep as possible. NOTE:Authority cited:Sections 3013 and 3106,Public Resources Code.Reference:Sec- tions 3106 and 3228,Public Resources Code. HISTORY: 1. Amendment filed 9-21-76;effective thirtieth day thereafter (Register 76, No.39). 2. Amendment filed 12-28-84;effective thirtieth day thereafter (Register 84, No.52).