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VEP C <br /> O� <br /> INDIAN RIVER COUNTY <br /> �-- PUBLIC WORKS DEPARTMENT <br /> STORMWATER DIVISION <br /> 180127th STREET OR�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 W44 <br /> SUBJECT: FINAL PAYMENT, APPROVAL OF CHANGE ORDER NO. 1, AND <br /> RELEASE OF RETAINAGE TO CLOSE CONSTRUCTION, LLC FOR <br /> MODIFICATIONS TO EGRET MARSH STORMWATER PARK FLOWAY <br /> DATE: March 13, 2013 <br /> DESCRIPTION AND CONDITIONS <br /> On October 16, 2012, Indian River County approved a construction contract with Close <br /> Construction, LLC to perform floway surface modifications to the algal turf scrubber at <br /> Egret Marsh Stormwater Park (Egret Marsh). One of the County's two regional <br /> stormwater and canal water pollution reduction facilities, Egret Marsh grows periphytic <br /> algae that removes dissolved nitrogen and phosphorus from approximately 10 million <br /> gallons of Indian River Farms Water Control District canal water per day before it is <br /> discharged into the Indian River Lagoon. The construction contract included removing <br /> Egret Marsh's original floway surface, which consisted of a high density polyethylene <br /> (HDPE) liner overlaid with a polyethylene grid. The floway modification was required <br /> because of significant grid failures that rendered the floway ineffective. Biogas <br /> accumulation below the HDPE liner along with many rips in the liner also created major <br /> operational problems, and the liner was also removed. Under the construction contract, <br /> the original floway was replaced with a new concrete floway that should require minimal <br /> maintenance for many years. Other contract work included construction of additional <br /> concrete work pads and other enhancements that will increase operational efficiency at <br /> the facility. <br /> The original contract price was $1,288,482 and project completion was set for March 2, <br /> 2013. During the course of work, several modifications to the original design were <br /> implemented as a result of the excellent compaction characteristics of the in situ floway <br /> F:\Public Works\KeithM\Stonnwater Projects\Egret Marsh Operation\Concrete Surface ModificationWgenda ItemsWgenda- <br /> Consent-Final Payment and Release of Retainage to Close.doc <br /> 33 <br />