2021-12-08_GENERAL DOCUMENTS - C1981019

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DocuSign Envelope ID:6BC32598-B737-464E-898A-81 F1 F7131339133 • Summary of any well workover procedures and results. • Casing pressure test results from routing MIT test or workover-related procedures. Injectate Characterization Table D-4 has a summary of current seep water constituent concentrations. There is some possibility that these constituent concentrations may vary over time. Additional water quality analysis is being performed to measure water quality compared to the proposed water quality limits. The additional analysis will include the analyte list included in Table 82-2. Table D-4. Injectate Water Quality Analyte Result MDL Units Field pH 7.05 0.01 s.u. Field Conductivity 6810 10 µmhos/cm Field Temperature 14.5 0.1 °C pH 8.3 0.1 s.u. Electrical Conductivity 4240 10 µmhos/cm Total Dissolved Solids (180) 3420 10 mg/L Total Alkalinity(as CaCO3) 1240 1 mg/L Bicarbonate as HCO3 1510 1 mg/L Carbonate as CO3 ND 1 mg/L Hydroxide as OH ND 1 mg/L Chloride 32 0.043 mg/L Sulfate 1450 0.049 mg/L Calcium 182 0.0451 mg/L Magnesium 121 0.0538 mg/L Potassium 21 0.0109 mg/L Sodium 829 0.237 mg/L Dissolved Arsenic 3 0.121 µg/L Dissolved Iron ND 2.65 µg/L Dissolved Manganese 956 0.214 µg/L Dissolved Selenium ND 0.299 µg/L Total Arsenic 3 0.781 µg/L Total Iron 610 2.49 µg/L Total Manganese 1070 0.788 µg/L Total Selenium ND 0.413 µg/L Attachment E. Plugging and Abandonment Plan The proposed injection well is designed for at least a 20-year useful life. When plugging is required, it will be plugged with cement in a manner which (1) isolates the injection zone(s), (2) will not allow the movement of fluids either into or between USDWs, and (3) isolates the well bore from any potential surface fluid migration paths. The anticipated well design is described in Attachment C, presented in Exhibit C-1, and described briefly below. The well has a surface casing including the upper Mancos shale to approximately 2,670 ft which 14