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Plugging and Abandonment Plan Individual wells shall be plugged and abandoned upon retirement. Plugging and abandonment will take place once it has been determined that there shall be no potential further use of a well, either for mining, testing, monitoring, or other purpose. Immediately prior to plugging and abandoning, the tubing system shall be removed from the intermediate casing. The plugging and abandonment plan (Appendix C), submitted by the permittee and revised by the EPA, consists of one (1) plug with the following specifications. A cast iron bridge (CIBP) shall be set inside the intermediate casing at approximately the bottom of the casing. American Soda will establish a cement plug from above the CIBP to the surface. If it is not possible to run a CIBP inside the intermediate casing due to well bore irregularities, a cement basket shall be run in the hole to establish the cement plug at the bottom of the intermediate casing. Both the surface and intermediate casings shall be cut down to 1 to 3 feet below ground level to salvage the wellhead. Cutting down the casings will also allow for more complete surface reclamation, which was recently requested by the BLM. This plan has been revised and approved by the EPA and is consistent with UIC requirements. The cement plug shall be set using one or more of the approved methods described in 40 CFR § 146.10. The number of sacks used for the cement plug shall be calculated based on available casing diameter information such that the resulting cement plug will extend vertically for the required vertical length inside the intermediate casing. A dry hole marker shall be installed which will have the name of the operator, well number, lease number and the legal description welded on the surface. Surface facilities associated with the various wells shall be removed, and the well pad(s) shall be reclaimed according to BLM specifications. EPA FINAL Area Permit No. CO3858-00000 Page 55 of 164