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n <br /> COLORADO <br /> dDivision of Water Resources <br /> Department of Natural Resources <br /> March 25, 2024 <br /> Andy Rodriguez, P.E. <br /> Civil Resources <br /> 323 5th Street <br /> Frederick, CO 80530 <br /> Re: Ewing Gravel Mine Substitute Water Supply Plan (WDID 0202682) <br /> DRMS Permit No. M-2023-033 (WDID 0210562) <br /> Section 30, Township 2 North, Range 66 West, 6th P.M. <br /> Water Division 1, Water District 2 <br /> SWSP ID: 9477 <br /> Approval Period: May 1, 2024 through December 31, 2025 <br /> Contact information for Andy Rodriguez: (303) 909-0776 or andv@civilresources.com <br /> Dear Andy Rodriguez: <br /> We have reviewed your request for a substitute water supply plan ("SWSP") in accordance with section <br /> 37-90-137(11), C.R.S., to replace depletions caused by mining operations at the Ewing Gravel Mine <br /> operated by BUNRCO Colorado LLC ("Applicant") along the South Platte River. The Applicant shall be <br /> responsible for compliance with this SWSP, but the State Engineer's Office ("SEO") may also pursue the <br /> landowner, for eventual compliance. This application is for a new plan and the required fee of $1,593 for <br /> the SWSP has been submitted (receipt number 10033981). <br /> SWSP Operation <br /> This SWSP covers depletions caused by gravel mining operations at the Ewing Gravel Mine, which is <br /> located in Section 30, Township 2 North, Range 66 West, 6th P.M. in Weld County (shown on attached <br /> Figures 1 and 2) north of Fort Lupton and just north of the Platteville Ditch headgate. Mining will occur in <br /> two terraces: the Piney Creek Alluvium which is the lower/younger terrace west of the ditch, and the <br /> Broadway alluvium which is the upper/older terrace east of the ditch. Depletions during this approval <br /> period include evaporative losses from exposed groundwater, water lost with mined product, water used <br /> for the slurry wall construction, dust control, and dewatering. Replacement water will be supplied by the <br /> City of Aurora using fully consumable water from their wastewater treatment plant. <br /> Depletions <br /> Evaporation <br /> The Applicant proposes to replace evaporation from exposed groundwater at the site based upon <br /> evaporation atlases in NOAA Technical Report NWS 33 and the SEO monthly distribution factors for sites <br /> below 6,500 feet. Gross annual evaporation at the gravel pit location is estimated to be 44 inches per <br /> year. Net evaporation is defined as gross evaporation less the consumptive use of water by vegetation <br /> that naturally occurred at the site prior to construction of the pit. The historical consumptive use was <br /> of cOl0 <br /> 1313 �herirra�i SLreeL, iir3r�ni kit1, I]entier, C�}b[]2U� I'3i]3_�Gb-3S�li r;arrr_ lurado_�av Few <br /> Jared S_ Palls, Gnvemar I Dan Gibbs, Executive Director I Jason ollnnann,State En�in rlDirector y �� 0 <br /> I <br /> *1876�` <br />