2011-10-11_HYDROLOGY - M1983194 - Laserfiche WebLink

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Operational Fluid Level Limitation At all times the rate of injection shall never exceed the rate of recovery pumping (verified by weekly average flows) plus the amount of fluid needed to replace the volume of produced nahcolite. Injection Fluid Limitation No off -site waste, on -site industrial wastes or solvents may be injected. Injection of any hazardous waste as identified by EPA under 40 CFR 261.3 is expressly prohibited. The approved injection fluid is a combination of the following fluids having a total volume equal to the quantity needed to produce brine at the rates required by production: (a) fresh water pumped from the A- Groove Aquifer, used as make -up water; (b) depleted solution mining production fluid from which the bicarbonate /carbonate content has been mostly removed. This fluid is recycled to the wells as part of the solution mining process; and (c) make -up water from the process pond. Well Construction The 12H -I well is a horizontal well that will be drilled into the lower Boies Bed. Surface Casing: A 13 3/8" 48# J -55, 8 RD, STC casing will be set at 80' in a 17 1/2" hole and cemented to surface with Class G or equivalent cement, isolating the surface casing from the wellbore and supplying a point of attachment for the blow -out preventer. Long String Casing: A 7 5/8" 26.4# J -55, 8 RD, LTC casing will be set at approximately 1450' true vertical depth (TVD). At approximately 1450', horizontal drilling commences at a build rate of about 14 degrees per 100 feet to total depth (TD) within the injection zone below the oil shale marker bed, located within the lower Boies Bed (L -5A zone). A 7 5/8" casing hanger and a 5 'A " FJ, 17 # Atlas- Bradford liner hanger will be set, as the well begins to deviate. Demonstration of Mechanical Integrity (1) A successful demonstration of Part I (Internal) Mechanical Integrity is required prior to injection, and no less than every five years after the last successful test. (2) The pennittee shall demonstrate Part II (External) Mechanical Integrity pursuant to 40 CFR §146.8(a)(2) using a temperature log and the demonstration of Part II Mechanical Integrity shall be repeated no less than every five years after the last successful test. Demonstration of Financial Responsibility The applicant has demonstrated financial responsibility by a Letter of Credit in the amount of $273,140 that has been approved by the EPA. The Director may revise the amount required, and may require the pennittee to obtain and provide updated estimates of costs for plugging the well according to the approved Plugging and Abandonment plan. Authorization for Additional Well: UIC Area Permit CO30358 -00000 Well: 12H -1 EPA Well ID: CO30358 -08416 Page 3 of 5