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Attachment Q Plugging and Abandonment Plan Application Requirements Submit a plan for plugging and abandonment of the well including: (1) describe the type, number, and placement(including the elevation of the top and bottom) of plugs to be used; (2) describe the type, grade,and quantity of cement to be used;and (3) describe the method to be used to place plugs,including the method used to place the well in a state of static equilibrium prior to placement of the plugs. Also for a Class III well that underlies or is in an exempted aquifer, demonstrate adequate protection of USDWs. Submit this information on EPA Form 7520-14,Plugging and Abandonment Plan. Approach The STIG-LEC facility wells will have similar construction,and each will need to be abandoned when they are no longer operable or the power plants are decommissioned. Therefore,the Plugging and Abandonment Plan applies to each onsite well. Plugging and Abandonment Description The following well description is of STIG-1 and can be inferred to represent both LEC-1 and LEC-2. This is also shown graphically in Figure Q-1. Depths shown and described are as measured from ground surface. A 10-3/4-inch casing string has been run and cemented from the surface to 611 feet,a 7-inch casing has been run and cemented from the surface to 3,660 feet, and the 4-1/2-inch liner is hung from 3,358 feet to 4,645 feet. The 5-inch liner was cemented prior to being gun- perforated between 4,234 and 4,573 feet. Inside the 5-inch liner is a gravel-packed 2-3/8-inch wire screen liner,installed between 4,155 and 4,567 feet. Inside the 7-inch casing is a 4-1/2-inch tubing string that extends from the surface to a packer set at 3,342 feet. The overall approach to the abandonment, or plugging, of the wells is to install a continuous cement plug to 100 feet above the top of the 5-inch liner. A second continuous cement plug is to be installed from a depth of approximately 700 feet,which is approximately 250 feet below the estimated depth of the potable aquifer (3,000 mg/L TDS) at this location to ground surface. The plugging procedures are as follows: 1. Move in and rig up a workover/completion rig. Remove the wellhead and install and activate blowout prevention equipment (BOPE). Run in the hole and unseat the packer. Pull the 4-1/2-inch tubing string and packer out of the well. SAC/371322/082560023(ATTACHMENT-Q.DOC) Q-1