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2(a)(iv) of this part. Casings shall be maintained throughout the operating life of the wells. The following approximate specifications from the permit application apply to both proposed injection wells CSC-1 and CSC-2: (a) Conductor casing: 24-inch outside diameter ("OD") (36 lbs J-55) from ground surface to approximately 40 feet below ground surface ("bgs"), cemented to surface. (b) Surface casing: 13-3/8 inch OD (48 lbs H-40) from ground surface to approximately 650 feet bgs, cemented to surface. (c) Long String Casing: 8-5/8 inch OD (32 lbs J-55) from ground surface to approximately 10 feet below the top of the target injection zone (approximately 2,020 feet for a Miocene sand completion or approximately 5,245 feet for a Cretaceous 2nd Tracy Sand completion), cemented to surface. (d) Liner and Gravel pack screen - under-ream injection zone to 15 inch diameter, install 5.5 inch gravel pack screen, with blank 5.5 inch liner (15.5 lbs J-55) from screen to liner packer. 8. Tubing and Liner Hanger Specifications For both injection wells CSC-1 and CSC-2, injection will take place through tubing strings and a liner hanger, subject to the following approximate specifications from the permit application: (a) Tubing: 4.5 inch OD (12.75 lbs J-55) from ground surface to approximately 1,900 feet bgs for the Miocene Sand completion or 5,100 feet bgs for the Cretaceous 2nd Tracy Sand completion. (b) Liner Hanger: A liner hanger will extend from a liner packer to the gravel pack screen. The liner packer will seal off the annulus between the 5.5 inch lower extension blank and the 8-5/8 inch casing. 9. Iniection Intervals Injection for both wells shall be permitted for either the Miocene Valley Springs Sand formation, expected to occur at depths estimated from about 2,010 feet bgs to about 2,382 feet (372 feet) or, alternatively, for the Cretaceous 2nd Tracy Sand formation, at depths estimated from about 5,235 feet bgs to about 5,502 feet bgs (267 feet). Minor alterations of the depths of injection zone intervals and therefore, the casing setting depths for CSC-1 and CSC-2 are expected to be realized upon drilling. These alterations and other rework operations that may occur later in the course of operation of the wells must be properly reported (use EPA Form 7520-12), UIC Permit CA10500002 Page 9 of 29