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Orange County <br />Lake Orange Intake Tower Replacement Geotechnical Exploration Coordination, Observation, and Reporting <br /> <br /> <br />24P21018.00 / February 18, 2026 Page 2 Schnabel Engineering South, P.C. <br />Task 1 – Planning and Coordination <br />Schnabel will work with the County to develop and review the scope of the geotechnical exploration to be <br />performed by CVET. We will also assist the County with the development of a specification for drilling and <br />sampling for the work by CVET. We have assumed CVET will contact the appropriate public utility <br />location service (NC 811) and coordinate with the County to mark their private utilities on the project site <br />at least 72 hours before any drilling occurs. <br />Task 2 – Geotechnical Exploration Observation <br />The geotechnical investigation is anticipated to include four borings performed around the existing intake <br />tower from a barge and one boring in the crest of the dam. The proposed depths and sampling <br />frequencies for each boring to be performed by CVET are summarized in Table 1. <br /> <br />Table 1: Summary of Test Boring Drilling, Sampling and Testing <br />Boring <br />ID General Location <br />Approx. <br />Ground <br />Surface <br />(Elev., <br />feet) <br />Approx. Soil & <br />Rock Drilling <br />Linear Footage <br />Approx. <br />Termination <br />(Elev., feet) <br />Proposed Sampling, In-situ <br />Testing and Termination <br />Criteria <br />B-01 15-ft Upstream, 15-ft <br />left of Intake Tower 597 12 5 580 5-foot interval SPTs <br />Terminate Boring 5-ft into Rock. <br />B-02 15-ft Upstream, 15-ft <br />right of Intake Tower 597 13 5 579 5-foot interval SPTs <br />Terminate Boring 5-ft into Rock. <br />B-03 <br />15-ft to the left of <br />Downstream left <br />corner of Intake <br />Tower and 5-ft <br />Upstream of Dam <br />606 22 5 579 5-foot interval SPTs <br />Terminate Boring 5-ft into Rock. <br />B-04 <br />15-ft to the right of <br />Downstream right <br />corner of Intake <br />Tower and 8-ft <br />Upstream of Dam <br />606 22 5 579 5-foot interval SPTs <br />Terminate Boring 5-ft into Rock. <br />B-5 <br />20-ft to the right of <br />Principal Spillway <br />Conduit Alignment, <br />located on the Dam <br />Crest <br />618 40 0 578 <br />5-foot interval SPTs <br />Terminate Boring at refusal or <br />at proposed depth, whichever <br />occurs first. <br />Install 2-inch PVC Open- <br />Standpipe piezometer with <br />flush-mount cover. <br />Notes: SPTs = Standard Penetration Tests in soil, Ground Surface and Termination Elevations estimated based on Bathymetric <br />Survey performed by Pennoni in January 2025. <br />Schnabel proposes to have one staff member on-site during the geotechnical explorations. We have <br />assumed drilling will take seven days to complete not including time to move between borings. The staff <br />member’s responsibilities will include observing drilling operations, and collecting and describing soil and <br />rock samples, and confirming test boing locations with a submeter accurate Trimble GPS. Boring <br />Docusign Envelope ID: 64C8DD46-2EE5-445D-9F2E-C6215945E8C2