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DocuSign Envelope ID:AD41 E8C7-FC41-4249-A9C6-849589FOC156 <br /> Mr. Steven Gandy, P.E. April 20, 2021 <br /> Chief Engineer <br /> DraperAden Associates <br /> sgandy@daa.com <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 /> Mr. Gandy, <br /> UMA, Geotechnical Construction, Inc. (UMA) is pleased to present thefollowing proposalforthe above- <br /> mentioned project. This proposal was prepared to approximate the costs associated with installing and <br /> providing the general scope of services associated with the required tieback anchors. <br /> Our opinions and statements regarding this proposal and our intended scope of services shall remain <br /> confidential 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 /> SCOPE OF SERVICES: <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 with the project at the current project value. In an effort to reduce costs for the County and to <br /> address the current rotational issue with the retaining wall, UMA is proposing to install mechanical <br /> anchors in-lieu 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 each side. This would result in an ultimate anchor capacity required 6,188 pounds per <br /> anchor considering four anchors. <br /> Based on preliminary assumed typical fill soil parameters and drive depths of 20 feet, UMA believes that <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 anchors will be pulled to an activation load of 100% DL to rotate the <br /> mechanical anchor. <br /> In addition,all other project specifications and crack repair will be performed as related to the original bid <br /> documentation. <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 /> 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 submittal <br /> containing the ultimate capacities of the anchors. <br /> ��� 'i1:0 336 @ 992 0746 19:estimator@team-uma.com O:wwwfeam-uma.com f: PO.Box 1070, <br /> F(336)9968573 Kernersville,NC27285smnsnF <br />