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Agenda - 06-18-2024; 8-m - Approval of a Professional Engineering Services Contract with Schnabel Engineering, Inc. for the Lake Orange Intake Tower Rehabilitation-Replacement Project
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Agenda - 06-18-2024; 8-m - Approval of a Professional Engineering Services Contract with Schnabel Engineering, Inc. for the Lake Orange Intake Tower Rehabilitation-Replacement Project
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6/18/2024
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8-m
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Agenda for June 18, 2024 BOCC Meeting
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19 <br /> schnabel-eng.com 1. Qualifications / Lake Orange Intake Tower / 3 <br /> of intake replacement alternatives, we will review existing information on the dam, intake system, <br /> and watershed such as as-built drawings, original design documentation, previous inspection and <br /> investigation reports, operation and maintenance records, and surveys. <br /> In conjunction with our review of existing information, we will setup a kickoff meeting and site <br /> walk-through with the County. The purpose of this meeting and walk-through will be to finalize <br /> the project approach and field survey plans, observe the existing site conditions in more detail, <br /> and discuss key project milestones, operational considerations, site constraints, and other <br /> requirements. <br /> At the conclusion of the kickoff meeting, we will schedule the field investigations discussed <br /> below, the results of which will be used to inform the evaluation of intake rehabilitation or <br /> replacement alternatives and design development. <br /> 1.2 Site Survey <br /> Schnabel understands there was a site survey performed by CH Engineering (now Pennoni) to <br /> support erosion repairs on the upstream slope of the earth embankment in 2020. Schnabel will <br /> subcontract with Pennoni to update this baseline topographic survey to confirm the general <br /> geometry and evaluation of key features including the dam, intake tower, and select portions of <br /> areas surrounding the dam. A bathymetric survey of the reservoir area in the vicinity of the intake <br /> structure should also be performed as this information will help inform the evaluation of intake <br /> replacement alternatives, including options for control of water and stream diversion during <br /> construction, and the subsequent design. <br /> 1.3 Environmental Investigations <br /> Our environmental subconsultant, Three Oaks Engineering (Three Oaks) of Durham, NC, will <br /> research jurisdictional wetlands and waters within the project area. Based on our experience, <br /> the proposed improvements will impact jurisdictional waters but should qualify for a Nationwide <br /> Permit #3. Three Oaks will consult with the USACE and NC DEQ and North Carolina Division of <br /> Water Resources (NC DWR) to confirm that the proposed work is compatible with a Nationwide <br /> Permit #3. Three Oaks will also advise Schnabel on planning and design of the work to meet <br /> USACE, NC DEQ, and NC DWR permit conditions and to avoid the need for compensatory <br /> mitigation. <br /> 1.4 Underwater Investigation <br /> Depending on the anticipated scope of the intake tower rehabilitation or replacement based on <br /> the kick off meeting and discussions with the County, an underwater investigation of the existing <br /> intake tower and surrounding areas may be prudent to refine project details and reduce risk. <br /> Schnabel supported two previous dive inspections of the intake tower and will utilize information <br /> gathered during those and will only request an additional underwater investigation if needed. We <br /> routinely team with experienced underwater contractors to perform these types of investigations, <br /> and we anticipate that the investigation for this project could be completed cost-effectively in one <br /> day if it is needed. <br /> 1.5 Subsurface Investigation <br /> Depending on the anticipated scope of the intake tower rehabilitation or replacement based <br /> on the kick off meeting and discussions with the County, a subsurface geotechnical/geological <br /> investigation of the intake tower and surrounding areas may be needed to obtain information to <br /> support the alternatives analysis and design. Also, it is our understanding that the County intends <br /> to keep the reservoir at least partially full during construction of the intake tower rehabilitation/ <br /> replacement, this will require the installation of a temporary cofferdam around the intake tower <br /> work area to allow for the area to be dewatered. The subsurface investigation will also gather <br /> Build Better.Together. <br />
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