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ATTACHMENT Q — Plugging and Abandonment Program <br /> Requirements <br /> The plugging and abandonment program must contain details on the following: <br /> 1. Type, number, and placement (including elevation of the top and bottom) <br /> of plugs to be used. <br /> 2. Type, grade, and quantity of cement to be used. <br /> 3. Method used to place plugs including the method used to place the well in <br /> a state of static equilibrium prior to placement of the plugs. <br /> Plugging and Abandonment Program <br /> An exact plugging and abandonment program cannot be developed for the well <br /> until drilling and construction are complete. Plug depths and remaining fluids in the <br /> borehole will vary depending on the depth of the injection zone. However, the well will <br /> be plugged and abandoned following procedures required by the CDOG including <br /> requirements for fluid weight-and viscosity.The tubing will be removed from the hole. In <br /> general, the following plugs and plate will be used in the abandonment process: <br /> • Plug across injection zone,bringing cement 100 feet into the 8-5/8 inch casing <br /> (>300-foot plug) <br /> • Plug at base of the USDW, estimated at 1,789 feet (200-foot plug) <br /> • Plug at surface of the well (100-foot plug) <br /> • Cut casing 5 feet below ground and weld steel plate on top of the casing stub. <br /> USEPA may approve modifications to this program based on information <br /> developed during the drilling, construction, and operation of the well. In addition, <br /> USEPA may modify the program in the future based on approved work-overs or well <br /> modifications. CSC will notify EPA no less than 60 days before conversion, work-over, <br /> or abandonment. Within 60 days of abandonment, CSC will provide details of the <br /> plugging plan on Form 750-14 to USEPA. Wells will be properly plugged in accordance <br /> with the plugging and abandonment program after injection operations have ceased for <br /> two years unless the permittee demonstrates that the wells will be used in the future or <br /> that the well will not endanger USDWs while temporarily abandoned. <br /> Costs for plugging and abandoning the injection well have been estimated by Irani <br /> Engineering at$45,000 for a Miocene injection well and $60,000 for a Cretaceous <br /> injection well. Preliminary cost estimates are included in the Supporting Documentation <br /> attached to this application. <br /> CSC UIC Permit Application 57 Todd Engineers <br />