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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): <br />1) Project Map <br />2) Plan Sheets Showing Rock Profile <br />Through Manhole #9 <br />3) Project Photo Showing Typical Depth <br />of Rock Excavation <br />INFORMATION CONTACT: <br />Craig Benedict, Planning, (919) 245- <br />2592 <br />Clarence Grier, Manager's Office/ <br />Finance and Administrative Services, <br />(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" <br />after constructing approximately 2,000 linear <br />excavated 4,665 cubic yards of rock. Becaus <br />Contractor has been using a special back hoe <br />allows it to be placed back in the trench. Th <br />truckload for disposal and having to purchase a <br />was removed. <br />sewer line was 2,000 cubic yards. However, <br />feet (83 %) of this line, the Contractor has <br />e of the large quantity of rocky material, the <br />designed to break up the blasted rock, which <br />is avoids having to haul the rock out by the <br />nd haul in select fill dirt to replace the rock that <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 />