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EXHIBIT A SCOPE OF PROFESSIONAL SERVICES AMENDMENT NO.4 INDIAN RIVER COUNTY SOLID WASTE DISPOSAL DISTRICT OSLO CUSTOMER CONVENIENCE CENTER The Indian River County Solid Waste Disposal District(IRC SWDD)currently operates a residential collection/recycling customer convenience center(CCC)at the former Oslo Landfill site.In an effort to provide an increased level of service to its residents,IRC SWDD is proposing to build a new CCC at the Oslo site to replace the existing facility.The existing CCC will remain operational until the new facility is complete.The proposed new facility will be constructed over the old Oslo solid waste dump site. The proposed improvements include paved access roads and parking/drive areas,attendant office, covered household hazardous waste and oil collection/storage area,restroom facilities,and a retention pond for stormwater treatment and attenuation.Stationary compactors with enclosed roll-off storage containers are proposed to be used to transport municipal solid waste(MSW)to the landfill.Open top roll-off containers will be used-to transport cardboard,paper,mixed recyclables, yard waste,recyclable metals,and tires to the landfill for processing.Household hazardous waste (HHW)will be collected at the proposed covered HHW and oil collection/storage area. On December 5,2012,the Contractor was issued a Notice to Proceed construction of the new Oslo CCC by December 10,2012 and complete the project in accordance with the Contract Time as follows:Partial Utilization by April 9,2013 (120 days),Substantial Completion by May 9,2013, (150 days),and Final Completion by June 8,2013 (180 days). On June 11,2013 IRC approved a Change Order extending the Contract Time to June 22,2013(194 days)for Partial Utilization,July 22,2013 (224 days)for Substantial Completion,and August 21, 2013 (254 days)for Final Completion. Based on an updated schedule received from the Contractor on September 10,2013,Substantial Completion and Final Completion of the project are anticipated by September 20,2013(284 days) and October 20,2013 (314 days),respectively. CDM Smith's current work authorization provides General Engineering Services During Construction for a 6-month construction period(150 days to substantial completion and 180 days to final acceptance).This amendment includes General Engineering Services During Construction for an additional 4.5 months (134 days)to coincide with the construction schedule. SCOPE OF SERVICES TASK 5.0-GENERAL ENGINEERING SERVICES CDM Smith will provide services during construction for the new Oslo CCC.Under this task,CDM will provide construction services on an as needed basis during construction for the estimated 6- A-1 jJln%JAmendment4.da 174