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DAUB & ASSOCIATES, INC. <br />July 31, 2025 <br />Mr. Gary Wang <br />USEPA — Region 8 <br />1595 Wynkoop Street (mail code: 8ENF-W-SDW) <br />Denver, CO 80202-1129 <br />1985 Yz 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 />Transmitted Electronically <br />On 07/31/2025 <br />Re: Natural Soda LLC 2025 2nd Quarter Report (Sent via e-mail R8U1CMai1box@EPA. Gov) <br />Dear Mr. Wang: <br />The following information is submitted for the 2025 second quarter report on behalf of <br />Natural Soda LLC (NS), as required in Part II.D.9 of UIC Permit C030358-00000. <br />Please note the Confidentiality of certain sections of this report. <br />The following 2025 second quarter information is submitted in compliance with UIC <br />Permit # C030358-00000: <br />Section A: <br />Non -Confidential Data <br />Page(s) <br />EPA Injection Well Monitoring Report (Form 7520-8) Pressure & Flow <br />03-14 <br />Injection Pressure & Flow Weekly Tables and Graphs <br />15-18 <br />Recovery Flow Weekly Tables and Graphs <br />19-25 <br />Section B: <br />CONFIDENTIAL DATA <br />Page(s) <br />EPA Injection Well Monitoring Report (Form 7520-8) (TEMP CONFIDENTIAL) <br />26-37 <br />Injection Temperature Weekly Tables and Graphs (CONFIDENTIAL) <br />38-43 <br />Total Bicarb and Temperature, 2024-2025 Graphs (CONFIDENTIAL) <br />44-46 <br />Mining Interval Allocations (Monthly Tables) (CONFIDENTIAL) <br />47-52 <br />Section C: <br />GROUNDWATER MONITORING WELLS (GMW) <br />Page(s) <br />GMW ACZ Data Sheets <br />53-78 <br />GMW Water Quality Data Tables <br />79-88 <br />SPECIALIZING IN PROFESSIONAL GEOLOGICAL, ENVIRONMENTAL, HYDROLOGICAL, GEOTECHNICAL AND PERMITTING SERVICES <br />