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1 <br /> ORD-2013-047 <br /> ORANGE COUNTY <br /> BOARD OF COMMISSIONERS <br /> ACTION AGENDA ITEM ABSTRACT <br /> Meeting Date: December 2, 2013 <br /> Action Agenda <br /> Item No. 7-a <br /> SUBJECT: Buckhorn Mebane Phase 2 Utilities— Request for Additional Rock Allowance <br /> and Approval of Budget Amendment#3-13 <br /> DEPARTMENT: Planning, Financial Services, PUBLIC HEARING: (Y/N) No <br /> Asset Management Services <br /> (AMS) <br /> ATTACHMENT(S): INFORMATION CONTACT: <br /> 1) Project Map Craig Benedict, Planning, (919) 245- <br /> 2) Photos Showing Rock Excavation 2592 <br /> Clarence Grier, Manager's <br /> Office/Financial Services, (919) 245- <br /> 2453 <br /> Kevin Lindley, Planning, (919) 245-2583 <br /> Jeff Thompson, AMS, (919) 245-2658 <br /> PURPOSE: To consider approving Budget Amendment #3-13 adding additional rock <br /> contingency to the Buckhorn Mebane Phase 2 Utilities Capital project budget. <br /> BACKGROUND: This project has been underway since the Spring of this year. The overall <br /> project is more than 50% complete and consists of three distinct parts: 9,000 linear feet of 18" <br /> gravity sewer line, 14,000 linear feet of 16"water line, and 5,700 linear feet of 8" and 12" gravity <br /> sewer line. These water and sewer lines will serve the areas designated for economic <br /> development and growth near Mebane and along the Interstate corridor in the western portion <br /> of Orange County (see Attachment 1). <br /> The original estimated rock quantity for the 18" sewer line was 3,825 cubic yards. However, <br /> after constructing approximately 4,600 linear feet (51%) of this line, the Contractor. has <br /> excavated 6,350 cubic yards of rock as of November 8, 2013. In Attachment 2, there are two <br /> photographs which give an indication of the jobsite conditions and rock quantities encountered <br /> so far. Because of the large quantity of rocky material, the Contractor has brought in a mobile <br /> rock crusher which can be seen in one of the photographs. The contractor has been crushing <br /> the excavated rock and returning it to the upper portion of the trench as fill. This avoids having <br /> to haul the rock out by the truckload for disposal and having to purchase and haul in select fill to <br /> replace the rock that was removed. <br /> The County's engineering consultant, Hobbs, Upchurch and Associates, is estimating that if <br /> conditions stay consistent with the first segment of this line, there could be an additional 4,500 <br /> cubic yards of rock left to be excavated to finish this line. If the consultant's estimate proves <br />