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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 />containers, taken to our soil laboratory for testing, and classified by a geotechnical <br />engineer. <br />The CPT hydraulically pushes an instrumented cone through the soil while nearly <br />continuous readings are recorded to a portable computer and no soil samples are <br />retrieved during the CPT. In addition, we observe and record groundwater levels during <br />drilling and sampling. We will provide seismic CPT testing (SCPT) to determine the shear <br />wave velocity with depth. This additional information is collected via an accelerometer <br />placed above the instrumented cone. A shear wave is generated at the ground surface, <br />such as a hammer striking a steel plate on the end, which propagates through the soil <br />and is recorded by the accelerometer at selected intervals (typically 1 meter). From this <br />data, the interval shear wave velocities of the soil are calculated. These inter val <br />velocities are used to develop the shear wave velocity profile for the site and are used to <br />determine a seismic site classification. <br />Our exploration team will prepare field logs as part of standard drilling operations <br />including sampling depths , penetration distances, and other relevant sampling <br />information. Field logs include visual classifications of materials encountered during <br />drilling, and our interpretation of subsurface conditions between samples. Final boring <br />logs, prepared from field lo gs, represent the Geotechnical Engineer's interpretation, and <br />include modifications based on observations and laboratory tests. <br />Property Disturbance: Terracon will take reasonable efforts to reduce damage to the <br />property; however, in the normal course of our work , some disturbance could occur <br />including rutting of the ground surface and damage to landscaping . <br />We will backfill bo reholes with soil after completion. We will rely on Orange County to <br />replace any landscaping or brick pavers relocated for the site exploration . We will limit <br />disturbance to the property when clearing paths for rig access, however some <br />landscaping and brush will need to be removed to allow our crews site access. Our <br />services do not include repair of the site beyond backfilling our boreholes. Excess auger <br />cuttings will be containerized and removed from site . Because backfill material ofte n <br />settles below the surface after a period, we recommend periodically checking and <br />backfilling boreholes, if necessary. We can provide this service, or grout the boreholes <br />for additional fees, at your request. <br />Safety <br />Terracon is not aware of environmental concerns at this project site that would create <br />health or safety hazards associated with our exploration program; thus, our Scope <br />considers standard OSHA Level D Personal Protection Equipment (PPE) appropriate. Our <br />Scope of Services does not include environmental site assessment services, but <br />identification of unusual or unnatural materials observed while drilling will be noted on <br />our logs. <br />Docusign Envelope ID: 2ECC4EBC-6A30-4243-9E7F-16636E4F3E4BDocusign Envelope ID: 752D86D7-DF31-404C-B79C-D4F81DF70B21