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6. Iniection Intervals Injection for wells STIG-1, LEC-1 and LEC-2 shall be permitted for the lower sand member of the Domengine Formation at depths between approximatel4 le bgs and 4,507 feet bgs. The entire injection unit is 831 feet thick at -1, La extending from 3,747 feet bgs to 4,578 feet bgs (the rmit is not less than 780 feet within'the Area of Review). The exact depths of injection zone intervals and casing setting depths 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 are considered minor for this permit and must be properly reported (use EPA Form 7520-12). The Permittee must demonstrate that each well has mechanical integrity, in accordance with Section D paragraphs 1(a) and 2 of this part, before any initial injection is authorized or before injection is recommenced after a workover has compromised the seal (see Part ILD.2(b)(i)). 7. Confining Laver The upper confining layer, the Nortonville Shale, is a dark gray marine shale and siltstone. It ranges in thickness from 100 to 200 feet within the Area of Review,with a thickness of 117 feet at the STIG-1 well. The Nortonville Shale confining layer is located between approximately 3,610 and 3,727 feet bgs. The lower confining layer, the Capay Shale Formation, is a marine shale to silty shale with occasional sand stringers. The estimated thickness of the Capay confining layer is approximately 150 feet, from 4,578 to 4,728 feet bgs. Field information on the Nortonville Shale formation at the LEC-1 and LEC-2 sites, such as its characteristics,thickness, and local structure will be obtained and updated during drilling of the injection wells and shall be included in the Final Well Construction Report required in paragraph 9(a) of this section. 8. Monitoring Devices The Permittee shall install and maintain in good operating condition: (a) A tap on the discharge line between the injection pump and the wellhead for the purpose of obtaining representative samples of injection fluids;and '(b) Devices to continuously measure and record injection pressure, annulus pressure, flow rate, and injection volumes,subject to the following: (i) Pressure gauges shall be of a design to provide: (1) A Rill pressure range of at least fifty (50) percent greater than the anticipated operating pressure; and FINAL UIC Permit CA 10910003 Page 10 of 29