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DocuSign Envelope ID:5COB7860-9C32-47EC-829F-BCA5B8OE52B3 <br /> STATE <br /> �'` Attachment A <br /> ROY COOPER Si ' = a <br /> Governor <br /> MICHAEL S.REGAN � <br /> Secretary <br /> LINDA CULPEPPER NORTH CAROLINA <br /> Director Environmental Quality <br /> April 2, 2019 <br /> Christopher Sandt <br /> Engineer <br /> Orange County Planning and Inspections <br /> 131 W. Margaret Lane (P.O. Box 8181) <br /> Hillsborough,NC 27278 <br /> RE: Aquatic Weed Control Program- Proposal for 2019 <br /> Mr. Sandt, <br /> The NC Aquatic Weed Control Program (AWCP) can continue to provide assistance to <br /> Orange County for Hydrilla management in Lake Orange and Sediment Structures 1 and 2 <br /> upstream of the lake. This letter provides recommendations and the costs associated with the <br /> various actions described for treating Hydrilla during the 2019 growing season. <br /> History of the situation: In the autumn of 1994, personnel from the AWCP performed a <br /> site assessment and found that Lake Orange was severely infested with Hydrilla(Hydrilla <br /> verticillata), a noxious aquatic weed recognized by the NC Department of Environmental <br /> Quality. In 1994 and 1998 the AWCP stocked triploid grass carp and performed herbicide <br /> applications to control the growth of Hydrilla in the lake. Hydrilla was thought to be extirpated <br /> from the system but in 2009 a resident of the lake reported a sighting of the plant to the AWCP. <br /> A site assessment conducted that same year confirmed that it was Hydrilla. Subsequent surveys <br /> found Hydrilla was still present in the system. Surveys conducted in 2014, 2015, 2016 and 2017 <br /> have found—2 acres, —16 acres, —30 acres and—1 acre of Hydrilla respectively. The 2018 survey <br /> found no Hydrilla in the system. Based on these survey results the AWCP recommends not to <br /> treat with herbicide in 2019. However, continued monitoring will be extremely important to <br /> ensure Hydrilla does not rebound in the lake. The surveys in 2017 and 2018 of Sediment <br /> Structure #1 (Compton's Pond) found approximately 7 acres of Hydrilla. A survey of Sediment <br /> Structure #2 found no Hydrilla. Since this was the first year of treatment and there are no sterile <br /> grass carp in the system the AWCP recommends another year of treatment. There was a report <br /> of Hydrilla growing in Sediment Structure 3 in 2018. The AWCP recommends doing a site <br /> assessment this year to determine if it is in fact Hydrilla. This will occur early in the year so that <br /> a treatment program can begin this year, if necessary. The AWCP staff has much experience <br /> managing Hydrilla in reservoirs throughout North Carolina. The combination of two <br /> management methods is very effective at controlling Hydrilla. These methods are the use of <br /> herbicide(s) and stocking sterile grass carp. <br /> EQ�� North Carolina Department oFEnvironmental Quality I Division of Water Resources <br /> 4��4S12 North Salisbury Street 1 1611 Mail Service Center I Raleigh.North Carolina 2 769 9-161I <br /> hCRlti Cn�_itin �1 <br /> oepenmeMni Em,iranmeneiw�� 919.7p7.9pflp <br />