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9/11/25,7:20 AM State.co.us Executive Branch Mail-Re: United Companies Colona Pit SWSP Submittal <br /> and the historical return flows that must be maintained are not accounted for. See the attached <br /> spreadsheet, "Depletions" tab, columns L through X. I would appreciate your review of these calculations. <br /> Thanks for sending over your calculations for comparison. I wanted to point out that historical return flows associated <br /> with the HCU credits are calculated in Column (8)of the attached Table 3 that was submitted as part of the SWSP <br /> renewal request and are accounted for in the"Historical Depletion Credit" in Column (9). <br /> Based on my review of your spreadsheet, it appears that the lagged depletions in Column L calculated using the <br /> URF function are incorrect, which I think may be why we are getting different required replacement amounts. For <br /> example, the lagged depletion calculation for August 2026 (row 21) includes the lagged effect from future depletions <br /> in months September and October being applied to that month.Additionally, the URF appears to be correct, but <br /> believe the lagged depletions should be calculated using the inverted URF in this case. Let me know if you disagree <br /> with my findings, I would be happy to setup a call to discuss. When I calculate the lagged depletions using the <br /> inverted, wrapped URF, I find that we have adequate replacement supplies from the USBR and TCWCD leases as <br /> shown in Table 4, attached here and provided with the SWSP renewal request. We also compared the lagged <br /> depletions calculated using the URF to the unwrapped lagged depletions calculated using AWAS and found similar <br /> results. I am happy to provide this AWAS file to you if you would like. <br /> Additionally, while we do have additional water available from the USBR and TCWCD leases, Table 4 in the SWSP <br /> renewal request only shows the application of the requisite replacement amounts. <br /> 3. 1 may have additional questions when the division office has completed their review. <br /> Understood. <br /> Please let me know if you have any questions. <br /> Regards, <br /> Wenli Dickinson, P.E. <br /> Water Resource Engineer <br /> Denver Office Team 456 Supervisor <br /> OL R DO <br /> Division of dater Resources <br /> Deparkrnen�of rqatural RezmTws <br /> 1313 Sherman St, Suite 821, Denver, CO 80203 dwr.colorado.gov <br /> If you are a customer or DWR employee, please feel free to submit feedback for me here. <br /> Note: 1 am out of the office every other Friday. <br /> On Wed, Jul 30, 2025 at 9:26 AM Wenli Dickinson <wenli.dickinson@state.co.us>wrote: <br /> Good morning, <br /> was just notified that this was paid under receipt no. 10043847 and should be entered into our <br /> system soon. As previously mentioned, I hope to be able to review this in the next month or two. <br /> Thank you for your patience, <br /> Wen li Dickinson, P.E. <br /> Water Resource Engineer <br /> https:Hmail.google.com/mail/b/ALGkdOxhJsspQ9WQy6M8ZvEdoQUrzvydSw2AkGT9zE9ZwUt2JrQJ/u/O/?ik=96aa8a08c9&view=pt&search=all&permt... 4/7 <br />