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�vE�ro <br /> 55 <br /> 44 <br /> INDIAN RIVER COUNTY <br /> PUBLIC WORKS DEPARTMENT <br /> STORMWATER DIVISION <br /> 180127th STREET 0R1�p' <br /> VERO BEACH,FLORIDA 32960 <br /> Phone: (772) 226-1562 <br /> TO: Joseph A. Baird, County Administrator <br /> THROUGH: Christopher R. Mora, P.E., Public Works Director <br /> FROM: W. Keith McCully, P,E,, Stormwater Engineer 1441 <br /> SUBJECT: APPROVAL OF MASTER AGREEMENT FOR ANNUAL BID FOR <br /> SEDIMENT REMOVAL AT PC MAIN SCREENING FACILITY <br /> DATE: April 9, 2013 <br /> �.. DESCRIPTION AND CONDITIONS <br /> The purpose of this Agenda Item is to request the Board of County Commissioners <br /> (Board) approve a contract with EMC Divers, Inc. for annual sediment removal at the <br /> PC Main Screening Facility, located in the Indian River Farms Water Control District's <br /> Main Relief Canal. PC Main is a regional pollution removal facility designed and <br /> constructed by the County to reduce pollution of the Indian River Lagoon (Lagoon). It <br /> removes solids as small as 1/16th inch from the canal water, significantly reducing the <br /> nutrient load and debris load entering the Lagoon from the Main Relief Canal. Two <br /> sedimentation basins are located immediately upstream of the treatment facility. Their <br /> purpose is to reduce the yearly total solids loading into the Indian River Lagoon by <br /> capturing easily settable solids traveling along the canal bottom. Collectively, the <br /> sedimentation traps hold approximately 148 cubic yards of sediment, equal to about <br /> eight 18-cubic yard dump trucks. Nitrogen and phosphorus are associated with many of <br /> the settable solids. Based on laboratory analysis, each sedimentation cell cleaning <br /> cycle (both cells cleaned) removes approximately 141 pounds of total nitrogen and 49 <br /> pounds of total phosphorus from the canal. These removals equal 35.25 and 24.50 <br /> forty-pound bags of 10-5-10 (N-P-K) fertilizer for total nitrogen and total phosphorus, <br /> respectfully. <br /> On April 3, 2013, bids were received for cleaning each of the two sedimentation basins <br /> up to four times per year. Also included was a one-time cost to remove collected <br /> r... <br /> F:\Public Works\KeithM\Stormwater ProjectsNain Relief Canal Operation\Dredging Sedimentation Basins\Agenda Items\Agenda- <br /> Consent-Master Agreement and Work Order 1 for Dredging Services-3-19-2013.doc <br /> 22 <br />