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13 <br /> RESCO' <br /> 11110FWL-c Imo.]„- <br /> February 4, 2020 <br /> Donald F. Greeley, Director <br /> Department of Water Management <br /> City of Durham <br /> 101 City Hall Plaza <br /> Durham, NC 27707 <br /> RE:Teer Quarry Operation and Eno River Capacity Use Area <br /> Dear Mr. Greeley, <br /> This letter is to confirm that Resco Products, referred to as Piedmont Minerals in the Voluntary Eno River Capacity <br /> Use Area Water Management Operations Plan (WMOP), has no objection to the City of Durham's proposed <br /> withdrawal of water from the Eno River under the conditions specified by the NC Department of Environmental <br /> Quality Division of Water Resources (DWR). The City of Durham, referred to as the Durham Water System in the <br /> WMOP, is subject to the Voluntary Eno River Capacity Use Area Water Management Operations Plan (WMOP), as <br /> are the Hillsborough Water System (Town of Hillsborough), Orange County,the Orange-Alamance Water System, <br /> and Piedmont Minerals (now Resco Products). <br /> The City of Durham (City) owns the Teer Quarry Reservoir located adjacent to the Eno River and needs to operate <br /> the facility under broader parameters than those currently permitted under the Finding of No Significant Impact <br /> (FONSI)for the Phase I Teer Quarry Supplemental Storage Project (2010) in order to meet the City's water supply <br /> needs. The City of Durham Department of Water Management developed a broader set of water withdrawal and <br /> water supply access conditions in collaboration with DWR,the NC Wildlife Resources Commission (WRC) and the <br /> US Fish and Wildlife Service (USFWS), and discussed those conditions with the Eno River Water Users at their <br /> annual meeting on August 30, 2019. <br /> The essence of the agreed-upon conditions for withdrawal from the Eno River is: <br /> 1. A withdrawal rate of 5 mgd is currently allowable under the Voluntary Eno River Capacity Use Area (CUA) <br /> Water Management Operations Plan. <br /> 2. Withdrawal rates exceeding 5 mgd may only occur when Eno River flows as measured at the USGS Eno <br /> River Gage near Durham (US-501) exceed the annual median flow of 49 cfs, i.e.,flows well above the low <br /> flow conditions of concern in the WMOP. <br /> 3. Withdrawal rates exceeding 5 mgd require a flowby rate downstream of the point of withdrawal <br /> measured at the USGS Eno River Gage Near Durham. <br /> a. The total flowby requirement in the Eno River downstream of the point of withdrawal will be 90% <br /> of flow above 49 cfs when Teer Quarry is above 254' MSL. <br /> b. The total flowby requirement in the Eno River downstream of the point of withdrawal will be 80% <br /> of flow above 49 cfs when Teer Quarry is below 254' MSL. <br /> 4. Withdrawal rates exceeding 5 mgd may only occur when Falls Lake is at or above guide curve (251.5' <br /> MSL). <br /> Sincerely, <br /> ica4a;H_ <br /> Tonya Scarlett, <br /> Resco Products, Inc—Hillsborough Plant Manager <br />