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6/29/22,7:07 AM State-co-us Executive Branch Mail-Re:ASCI Chavers Mining Resource SWSP_PY 2022-2023 <br /> trying to tie things up before I leave. Should you have additional questions, please e-mail them; however, it may be <br /> late-next week before I will be able to address them. Hope this is ok. <br /> Thanks! <br /> Greg <br /> From: Dickinson - DNR, Wenli <wenli.dickinson@state.co.us> <br /> Sent: Tuesday, May 31, 2022 7:06 PM <br /> To: Greg Geras <GregG@asphaltspecialties.com> <br /> Subject: Re: ASCI Chavers Mining Resource SWSP_PY 2022-2023 <br /> [External Email] <br /> Hi Greg, <br /> I am reviewing the Chavers Mining Resource SWSP renewal request and had a few questions: <br /> 1.The distance from well to stream used for the Aggregate Mining lagged depletion model <br /> is stated to be 575 feet (page 4 of the request), but the distance used in the model is <br /> 350 feet. Was 350 feet used and 575 feet is an error on page 4? <br /> 2. It appears the request is for a renewal through December 31, 2022, and then to have <br /> that extended through July 31, 2023 if the lease with Aurora is renewed through 2023. <br /> Is this correct? <br /> 3. If so, could you confirm that the unlagged depletions for each use from Aug - Dec 2022 <br /> are: 6.09 of of evaporation, 0.52 of for dust control, 8.22 of for mined product, and <br /> 6.28 of for concrete production = 21.11 of total for Aug - Dec 2022? Could you also <br /> confirm that the lagged depletions for each use from Aug - Dec 2022 are: 11.82 acre- <br /> feet associated with the evaporation from the pump basin and dewatering trench and <br /> mined aggregate, 4.36 acre-feet associated with the evaporation from the wash pond <br /> and dust control, and 6.26 acre-feet associated with the water pumped from the <br /> alluvial well for concrete production = 22.44 of total for Aug - Dec 2022? 1 just want to <br /> double check that I have added these up correctly since these limits will be in the <br /> conditions of approval if the plan is not extended through 2023. <br /> Thank you, <br /> Wenli Dickinson <br /> Water Resource Engineer <br /> I I <br /> https://mail.google.com/mail/b/ALGkdOxhJsspQ9WQy6M8ZvEdoQUrzvydSw2AkGT9zE9ZwUt2JrQJ/u/O/?ik=96aa8aO8c9&view=pt&search=all&permt... 3/4 <br />