Orange County NC Website
Browse       Search
January 25, 2022 <br />Christopher J. Sandt, PE <br />Staff Engineer <br />Orange County Planning and Inspections Department <br />131 W. Margaret Lane (P.O. Box 8181) <br />Hillsborough, NC 27278 <br />Subject: Revised Proposal for Additional Services for the Lake Orange Dam Replacement of <br />Sluice Gates and Concrete Repairs, Orange County, North Carolina (Schnabel <br />Reference 20P21019.01) <br />Dear Mr. Sandt: <br />SCHNABEL ENGINEERING SOUTH, P.C. is pleased to submit this revised proposal for additional dam <br />engineering services for the Lake Orange Dam. We prepared this proposal in response to our phone <br />conversations on December 11, 2020 and January 7, 2021, and based on your requested modifications <br />via email on January 21, 2022. Our proposed scope of services, anticipated schedule, and basis of <br />compensation are described below. <br />PROJECT DESCRIPTION <br />Lake Orange Dam (ORANG-005) is located in Cedar Grove, North Carolina and impounds the East Fork <br />of the Eno River. The dam and reservoir is owned by Orange County and is used for recreation and <br />potentially water supply. According to the North Carolina Department of Environmental Quality (NCDEQ) <br />Dam Safety inventory, the dam was constructed in 1969. The dam is an approximately 30-foot high, <br />1,100-foot long earthen embankment that impounds an approximately 140-acre lake at normal pool and <br />has a maximum storage capacity of approximately 1,640 acre-feet. The dam is regulated by NCDEQ Dam <br />Safety as a medium-size, high hazard structure. Flows from the reservoir are controlled with an intake <br />tower structure with four sluice gates at various elevations, a fifth sluice gate is used to regulate flow from <br />the intake tower into the outlet conduit. The auxiliary spillway is a concrete side-channel style trapezoidal <br />chute spillway, located on the left abutment. The control section of the auxiliary spillway is regulated by <br />removable flashboards. <br />Schnabel entered into an agreement with Orange County on August 25, 2020 to inspect the concrete <br />auxiliary spillway and coordinate with a commercial diver (In-Water Services, Inc. (In-Water)) contracted <br />by Orange County to inspect the concrete intake tower. During the intake tower dive inspection, and <br />summarized in a Dive Inspection Memo by In-Water dated November 30, 2020, the intake tower was <br />observed to be in generally poor condition with concrete spalls up to 6-inches in depth in the 12-inch thick <br />wall sections with no visible rebar; and exposed rebar in the interior of the intake tower. The poor <br />condition of the intake tower led to questions on the suitability of the intake tower to accommodate new <br />Attachment A - Task 6 (Additional Services)DocuSign Envelope ID: 3667B243-40E4-479A-AE63-F797402CD54A