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1 <br /> ORD-2014-031 <br /> ORANGE COUNTY <br /> BOARD OF COMMISSIONERS <br /> ACTION AGENDA ITEM ABSTRACT <br /> Meeting Date: June 17, 2014 <br /> Action Agenda <br /> Item No. 7-f <br /> SUBJECT: McGowan Sewer Interceptor Additional Rock Allowance and Approval of <br /> Budget Amendment#9-E <br /> DEPARTMENT: Planning, Finance and PUBLIC HEARING: (Y/N) No <br /> Administrative Services, Asset <br /> Management Services (AMS) <br /> ATTACHMENT(S): INFORMATION CONTACT: <br /> 1) Project Map Craig Benedict, Planning, (919) 245- <br /> 2) Plan Sheets Showing Rock Profile 2592 <br /> Through Manhole #9 Clarence Grier, Manager's Office/ <br /> 3) Project Photo Showing Typical Depth Finance and Administrative Services, <br /> of Rock Excavation (919) 245-2453 <br /> Kevin Lindley, Planning, (919) 245-2583 <br /> Jeff Thompson, AMS, (919) 245-2658 <br /> PURPOSE: To consider approving Budget Amendment #9-E adding additional rock <br /> contingency to the McGowan Sewer Interceptor capital project budget. <br /> BACKGROUND: This project has been underway since March 17, 2014. The overall project <br /> is approximately 85% complete and consists of 2,400 linear feet of 12" gravity sewer line and <br /> de-commissioning of the McGowan Creek Sewer Pump Station. The installation of this gravity <br /> sewer line will allow the County to take the 26 year-old McGowan Creek Pump Station off line, <br /> which reduces the annual maintenance costs for the system and avoids costly reconstruction of <br /> the aging pump station (see Attachment 1). <br /> The original estimated rock quantity for the 12" sewer line was 2,000 cubic yards. Cowever, <br /> after constructing approximately 2,000 linear feet (83%) of this line, the Contractor has <br /> excavated 4,665 cubic yards of rock. Because of the large quantity of rocky material, the <br /> Contractor has been using a special back hoe designed to break up the blasted rock, which <br /> allows it to be placed back in the trench. This avoids having to haul the rock out by the <br /> truckload for disposal and having to purchase and haul in select fill dirt to replace the rock that <br /> was removed. <br /> The County's engineering consultant, McGill Associates, is estimating that there could be an <br /> additional 1,209 cubic yards of rock left to be excavated to finish this project. If the consultant's <br /> estimate proves correct, the total rock excavated for this 12" sewer line would be 5,873 cubic <br /> yards. When compared to the original estimate of 2,000 cubic yards, the difference is 3,873 <br /> cubic yards. <br />