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DAUB & ASSOCIATES, INC. <br /> <br /> <br />SPECIALIZING IN PROFESSIONAL GEOLOGICAL, ENVIRONMENTAL, HYDROLOGICAL, GEOTECHNICAL AND PERMITTING SERVICES <br />1985 ½ SOUTH BROADWAY <br />GRAND JUNCTION, CO 81507-9649 <br />(970) 254-1224 <br />FAX (970) 242-8438 <br />Email: gjdaub@daubandassociates.com <br />www.daubandassociates.com <br /> <br />January 31, 2024 <br /> <br /> <br />Mr. Nathan Wiser <br />Ground Water Specialist <br />USEPA – Region 8 <br />1595 Wynkoop Street (mail code: 8ENF-W-SDW) <br />Denver, CO 80202-1129 <br /> <br />Re: Natural Soda LLC 2023 4th Quarter Report <br />(Sent via e-mail to: R8UICMailbox@epa.gov) <br /> <br />Dear Mr. Wiser: <br /> <br />The following information is submitted for the 2023 fourth quarter report on behalf of <br />Natural Soda LLC (NS), as required in Part II.D.9 of UIC Permit CO30358-00000 and Part <br />II.D.4 of UIC Permit CO32169-00000. <br />Please note the Confidentiality of certain sections of this report. <br />The following 2023 fourth quarter information is submitted in compliance with UIC <br />Permits: <br />Section A: <br />Non-Confidential Data Page(s) <br />EPA Injection Well Monitoring Report (Form 7520-8) Pressure & Flow 04-15 <br />Injection Pressure & Flow Weekly Tables and Graphs 16-19 <br />Recovery Flow Weekly Tables and Graphs 20-26 <br /> <br />Section B: <br />CONFIDENTIAL DATA Page(s) <br />EPA Injection Well Monitoring Report (Form 7520-8) (TEMP CONFIDENTIAL) 28-39 <br />Injection Temperature Weekly Tables and Graphs (CONFIDENTIAL) 40-43 <br />Total Bicarb and Temperature, 2022-2023 Graphs (CONFIDENTIAL) 44-46 <br />Cavity Allocations (Monthly Tables) (CONFIDENTIAL) 47-52 <br /> <br />Section C: <br />GROUNDWATER MONITORING WELLS (GMW) Page(s) <br />GMW ACZ Data Sheets 54-105 <br />GMW Water Quality Data Tables 106-125 <br />