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Attachment 2 6 <br /> WATER MANAGEMENT <br /> CITY OF DURHAM <br /> October 29, 2019 <br /> Ms. Linda Culpepper, Director <br /> Division of Water Resources <br /> NC Department of Environmental Quality <br /> 1611 Mail Service Center <br /> Raleigh, NC 27699-1611 <br /> RE:Teer Quarry Operation and Eno River Capacity Use Area <br /> Dear Ms. Culpepper: <br /> The City of Durham (City) owns the Teer Quarry Reservoir located adjacent to the Eno River and needs to <br /> operate the facility under broader parameters than those currently permitted under the Finding of No <br /> Significant Impact (FONSI)for the Phase I Teer Quarry Supplemental Storage Project (2010) in order to meet the <br /> City's water supply needs.The City of Durham Department of Water Management (DWM) developed a broader <br /> set of water withdrawal and water supply access conditions in collaboration with the Division of Water <br /> Resources(DWR), the NC Wildlife Resources Commission (WRC) and the US Fish and Wildlife Service (USFWS), <br /> and presented those conditions to the Eno River Water Users at their annual meeting. <br /> The Durham Water System (City of Durham) is subject to the Voluntary Eno River Capacity Use Area (CUA) Water <br /> Management Operations Plan (WMOP), as are the Hillsborough Water System (Town of Hillsborough),the <br /> Orange-Alamance Water System, and Piedmont Minerals (now Resco Products).The WMOP was implemented <br /> as a result of low flow conditions during which the demand for water exceeded the amount of water available <br /> from the Eno River. With the exception of the City's withdrawal from the Eno River(downstream from US-501), <br /> the WMOP is based on Lake Orange water levels (upstream of the USGS Eno River Gage at Hillsborough) and Eno <br /> River flows at the USGS Eno River Gage at Hillsborough (US-70). See Figure 1 on the next page. <br /> The WMOP allows the City to withdraw 5 mgd from the Eno River when flows are above 30 cfs from March <br /> through May and above 10 cfs during other times of the year. The WIVIOP allows public water supply systems to <br /> withdraw additional water from the Eno River during periods of higher flow "provided that they have long-term <br /> contracts for obtaining an equal amount of water from outside the basin when the flow in the Eno River drops" <br /> (Eno River Capacity Use Investigation Water Management Operations Plan, p.4). The City has a Jordan Lake <br /> water supply allocation of 16.5%which is equal to 2,462 million gallons of water supply storage (estimated to <br /> reliably yield 16.5 million gallons per day), satisfying that requirement in the WMOP. <br /> The WMOP does not define the Eno River flow conditions for water withdrawals greater than 5 mgd.The DWM <br /> worked with the DWR,the WRC and the USFWS to develop and analyze a range of hydrologic modeling <br /> scenarios using the DWR's Cape Fear-Neuse River Basins Hydrologic Model to develop operational conditions <br /> under which the City can withdraw more than 5 mgd from the Eno River without negatively impacting the <br /> stream ecology or other Eno River users. <br /> 1600 Mist Lake Dr.Durham, NC 27704 919.560.4381 DurhamNC.gov Follow Us @CityofDurhamNC <br /> 1 00 0 <br />