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<br /> <br /> <br /> <br />Mr. Steven Gandy, P.E. <br />Chief Engineer <br />Draper Aden Assoc iate s <br />sgandy@daa.com <br />April 20, 2021 <br /> <br />Reference: Driven Mechanical Anchor Alternate <br />Orange County Solid Waste Management Facility <br />Orange County, North Carolina <br />UMA Proposal No.: 21-53720 <br /> <br />Mr. Gandy, <br /> <br />UMA, Geotechnical Construction, Inc. (UMA) is pleased to present the following proposal for the above- <br />mentioned project. This proposal was prepared to approximate the costs associated w ith installing and <br />providing the general scope of services associated with the required tieback anchors. <br /> <br />Our opinions and statements regarding this proposal and our intended scope of serv ices shall remain <br />co nfidential to you and shall not be made available to another party without the expressed written consent <br />of UMA. All concepts and procedures stated in this proposal shall be deemed as intellectual property of <br />UMA. <br /> <br />SCOPE OF SERVICES: <br /> <br />UMA understands that Orange County requested bids for helical tieback anchors based on the design <br />and plans performed by Draper Aden Associates. Unfortunately, there were too few bidders to move <br />forward w ith the project at t he current project va lue. In an effort to reduce costs for the County and to <br />add ress t he current rotational issue with t he retaining wall , UMA is proposing to install mechanical <br />anc hors in-lie u of the illustrated helical piles . Based on calculating the total design reaction load for three <br />helical piles and extrapolating it to four mechanical anchors, UMA has considered a total reaction of <br />16,500 pounds on eac h side. This wou ld result in an ultimate a nc hor capacit y required 6, 188 pounds per <br />anchor considering four anchors. <br /> <br />Based on preliminary assumed ty pical fill soil parameters and drive depths of 20 feet, UMA believes t hat <br />this capacity is achievable. To ensure capacity is met, UMA will proof test one anchor per side to 150% <br />of the design load. The remaining a nc hors will be pulled t o an activation load of 100% DL to rot ate the <br />mechanical anchor. <br /> <br />In addition, all other project specifications and crack repair will be performed as related to the original bid <br />documentation . <br /> <br />If our proposed costs are acceptable, please feel free to sign this proposal and/or provide a purchase <br />order or similar documentation. <br /> <br />To aid in the evaluation of this alternate, UMA has included material technical data for the mechanical <br />anchors. As these anchors are performance based, UMA will provide a sealed material submitta l <br />containing the ultimate capacities of the anchors. <br /> <br /> <br /> <br /> <br />'il :0 (336) 992 0746 <br />F (336) 996 8573 <br />I <br />19 : est imator@tea m-uma.com 0 : www.team- uma.com f : P.O.Box 1070, <br />Kernersvil le, NC 27285 <br />• <br />DocuSign Envelope ID: B2D44CC3-6321-4EF3-AFC6-547186A1261E