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Proposal for Geotechnical Engineering Services <br />Orange County Board of Elections Expansion | Hillsborough, North Carolina <br />Spetmeber 19, 2025 | Terracon Proposal No. P75255087 <br /> <br /> <br /> Facilities | Environmental | Geotechnical | Materials <br />Additional Services <br />In addition to the services noted above, the following are often associated with <br />geotechnical engineering services. Fees for services noted above do not include the <br />following: <br />Review of Plans and Specifications: Our geotechnical report and associated verbal <br />and written communications will be used by others in the design team to develop plans <br />and specifications for construction. Review of project plans and specifications is a vital <br />part of our geotechnical enginee ring services. This consists of review of project plans <br />and specifications related to site preparation, foundation, and pavement construction. <br />Our review will include a written statement conveying our opinions relating to the plans <br />and specifications’ consistency with our geotechnical engineering recommendations. <br />Observation and Testing of Pertinent Construction Materials: Development of our <br />geotechnical engineering recommendations and report relies on an interpretation of soil <br />conditions. Our assessment is based on widely spaced exploration locations and the <br />assumption that construction methods will be performed in a manne r sufficient to meet <br />our expectations and consistent with recommendations made at the time the <br />geotechnical engineering report is issued. We should be retained to conduct construction <br />observations , and perform/document associated materials testing, for site preparation <br />and foundation construction. These services allow a more comprehensive understanding <br />of subsurface conditions and necessary documentation of construction to confirm and/or <br />modify (when necessary) the assumptions and recommendations made by our <br />engineers. <br />Seasonal High Water Table (optional): Terracon can perform subsurface testing and <br />sampling for determining the presence or absence of seasonal high water table, if <br />requested. The Civil Engineer can determine if SHWT determination will be required. We <br />can provide percolation (ksat) testing for evaluati ng infiltration when needed for BMP <br />design upon request. <br />Wetlands Delineation : If required, we can perform wetlands delineation in general <br />accordance with U.S. Army Corps of Engineers procedures. <br />Hand Auge r Exploration: We can perform additional exploration immediately adjacent <br />to the existing building utilizing hand auger and dynamic cone penetrometer (D CP) <br />testing. The DCP test advances a pointed rod through the soil strata utilizing a standard <br />weight slide hammer falling a standard distance, which may both vary depending on the <br />equipment used. DCP testing will be performed in accordance with ASTM STP -399 at <br />select intervals in the soil, typically 1 -foot increments. Increments may be adjusted as <br />the hand auger borings are advanced if areas of specific interest are identified. <br />Alternatively, Terracon may use a Kessler “dual -mass” DCP in general accordance with <br />ASTM D6951. <br />Docusign Envelope ID: 2ECC4EBC-6A30-4243-9E7F-16636E4F3E4BDocusign Envelope ID: 752D86D7-DF31-404C-B79C-D4F81DF70B21