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smNith <br />1701 Highway A -1-A, Suite 301 <br />Vero Beach, Florida 32963 <br />tel: 772-231-4301 <br />fax: 772-231-4332 <br />March 1, 2018 <br />Mr. Himanshu Mehta, P.E. <br />Managing Director <br />Indian River County <br />Solid Waste Disposal District <br />1325 74th Avenue SW <br />Vero Beach, FL 32968 <br />Subject: Indian River County <br />Segment 3, Cell 2 Expansion, Segment 2 Partial Closure, and <br />Landfill Gas System Expansion <br />100 Percent Opinion of Probable Construction Cost <br />Dear Mr. Mehta: <br />This letter provides the 100 Percent Opinion of Probable Cost of Construction (OPCC) for the <br />Segment 3, Cell 2 Expansion, Segment 2 Partial Closure, and Landfill Gas System Expansion <br />projects as prepared by CDM Smith Inc. (CDM Smith). The OPCC is based on the following: <br />PROJECT DESCRIPTION <br />The work of this Contract is located at the Indian River County Landfill at 1325 74th Avenue SW <br />in Vero Beach, Florida. The work includes the construction of a new Class I municipal solid <br />waste cell (Segment 3, Cell 2), partial closure of Segment 2 from approximate elevation 100 feet <br />NGVD to the top, final grade of 180 feet NGVD, construction of a new landfill access road and <br />improvements to the existing access road, construction of a new lift station and forcemain to <br />augment the existing leachate management system, and improvements to the landfill gas <br />collection system as further described below: <br />Segment 3, Cell 2 Landfill Expansion - The work for the Segment 3, Cell 2 expansion includes <br />the construction of a landfill bottom liner, leachate collection system (LCS), leachate <br />detection system (LDS) and LDS pump station, associated gravity collection manholes, and <br />site improvements. The proposed Cell 2 landfill bottom liner system is comprised of 6 inches <br />of processed sand, a geosynthetic clay liner, a secondary 60 -mil high density polyethylene <br />(HDPE) liner, a secondary geonet, a primary 60 -mil HDPE liner, a primary geocomposite, and <br />2 feet of protective sand. <br />■ Leachate Pump Station and Forcemain - The LCS pump station will collect leachate from <br />Segment 3, Cell 2 and future Cells 3 and 4 and convey it via a new leachate transmission <br />forcemain which will tie-in to the existing forcemain located by the Biosolids Facility centrate <br />64 <br />WATER + ENVIRONMENT + TRANSPORTATION + ENERGY + FACILITIES <br />