Agenda 03-15-22; 8-f - Lake Orange Erosion Control Barrier Replacement Project – Award of Construction Contract Amendment #1 (Amendment over $250,000)

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2 Engineering Division of the Planning & Inspections Department has determined that the existing earthen berm is exhibiting significant structural deterioration along the entire length of the 1,000+ foot long earthen berm. These structural deficiencies are far worse than originally anticipated, and have only become apparent due to the Engineering Division's current ability to observe the portions of the earthen berm that are typically underwater. Attachment 2 is a summary of photographs showing the deteriorated conditions of the existing erosion control barrier along the Lake Orange dam (taken while the water level is currently down). The Engineering Division estimates that upwards of 50 cubic yards of earthen dam have been lost to erosion over the decades due to the continued deterioration of the existing erosion control barrier, and that this erosion will increase exponentially over time until the issue is addressed. While there is no immediate risk of dam failure, the existing deteriorated erosion control barrier must be stabilized/repaired/replaced as soon as possible. Proposed Contract Amendment #1 scoping includes the complete removal and replacement of the existing deteriorated erosion control barrier with a robust system of interlocking concrete blocks called ArmorFlex. See Attachment 3 for a display of the scoping for Contract Amendment #1 and pictures of a typical ArmorFlex system. This scoping is as described within Orange County Bid No. 367-OC 5339 as "ALT-1". Use of the currently mobilized contractor (Fred Smith) to perform this construction work while the Lake Orange water surface is in its temporarily lowered condition will provide the most economical and pragmatic means for commencing this critical dam reconstruction/repair work. FINANCIAL IMPACT: Contract Amendment #1 will be funded via $306,180 of requested additional construction funding for CIP #10074, as contained within proposed Budget Amendment #9. Budget Amendment #9 is a separate agenda item on the March 15, 2022 meeting agenda. The pending construction contract amendment will not exceed the $306,180 Budget Amendment request for the Project. SOCIAL JUSTICE IMPACT: The following Orange County Social Justice Goal is applicable to this item: • GOAL: ENSURE ECONOMIC SELF-SUFFICIENCY The creation and preservation of infrastructure, policies, programs and funding necessary for residents to provide shelter, food, clothing and medical care for themselves and their dependents. ENVIRONMENTAL IMPACT: The following Orange County Environmental Responsibility Goal impact is applicable to this agenda item: • RESULTANT IMPACT ON NATURAL RESOURCES AND AIR QUALITY Assess and where possible mitigate adverse impacts created to the natural resources of the site and adjoining area. Minimize production of greenhouse gases. RECOMMENDATION(S): The Manager recommends that the Board: 1. Authorize the County Manager and staff to approve the award of Contract Amendment #1 (Attachment 4) to the Fred Smith Company of Raleigh, NC; 2. Authorize the Board Chair to execute Contract Amendment #1 (Attachment 4) for the Project with the Fred Smith Company of Raleigh, NC on behalf of the Board, subject to final review by the County Attorney; and 3. Authorize the County Manager to execute any subsequent construction contract amendments with the Fred Smith Company on behalf of the Board, up to the approved budget amount and subject to final review by the County Attorney.