2020-792-E AMS-ECS Southeast LLP Efland geotechnical services

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DocuSign Envelope ID:254EEE07-4235-430E-AB86-8BA7FDCF270B November ECS Southeast, LLP g. Recommended allowable soil bearing pressure(s) for conventional shallow foundations (spread footings) and estimates of predicted foundation settlement. We will provide recommendations for suitable intermediate foundations/ground improvement options in the event estimated settlements of shallow foundations are not tolerable. h. Recommendations for slab-on-grade design and construction, including recommendations for subgrade materials and design modulus of subgrade reaction. i. Recommendations for seismic site classification in accordance with the 2018 North Carolina Building Code. j. Recommendations for design and construction of the pavements, including a recommended California Bearing Ratio(CBR) design value. We will also include recommended pavement section thicknesses based on assumed 18-kip Equivalent Single Axle Loads(ESALs). k. Recommendations for subgrade preparation and earthwork, including excavation considerations, structural fill material, structural fill placement, and other applicable special considerations (e.g., existing fill, potentially expansive soil, and deep fill sections). I. Recommendations for additional testing and/or consultation that might be required to complete the geotechnical assessment and related engineering for this project. Utility Clearance We will contact North Carolina One Call to locate underground utilities at the site; however, our experience indicates that North Carolina One Call will not locate utilities beyond the point of distribution (meters or gauge points) on private property. We will coordinate our boring locations in order to avoid any underground utilities indicated by the North Carolina One Call locating system. Due to the developed nature of the site and to facilitate safety, a private utility locating service is proposed for this project. Our lump sum fee includes the cost for ECS to retain a private locator service to locate utilities beyond the meters and public utilities at the site. ECS will also coordinate with the Owner, utility companies, and municipalities concerning the location of underground utilities within the planned work areas. Contracting a private utility locator service is not a guarantee that all utilities within a work site will be identified,but a service that is offered to lower the risk of the owner/client. ECS and our clients have had past success in avoiding utility conflicts by augmenting the North Carolina One Call services with a private utility locator service. Private utility locator services can identify utility alignments that incorporate significant iron content in the conduit materials. However, private utilities possessing the higher likelihood of not being easily identifiable, beyond the point of distribution, include all utilities not containing significant ferrous (iron) content (examples would include but not be limited to most sanitary sewer alignments, copper or PVC water lines,fiber optic lines without tracer ribbons,copper electric lines with no surface exposure, drainage tiles/pipes, and irrigation lines). Where a private locator service identifies a potential risk that is not traceable through conventional methods, ECS will notify the client immediately and work to resolve the issue. Additional costs related to the resolution of these potential utility conflicts will be invoiced out per our unit rates,as identified in this proposal, or as negotiated and approved at the time of the occurrence. Site Restoration Upon completion of subsurface exploration drilling, we will backfill each of the boreholes with the drill cuttings and mound the excess spoil back up over each boring location. In pavement areas, we will drill through the existing asphalt with hollow stem augers or wash rotary drilling bits, which could lead to minor heaving of the asphalt adjacent to the boreholes. After backfilling a ECS Proposal No:06:22345 Page 16 0