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AMENDMENT No. 28 TO THE AGREEMENT BETWEEN OWNER AND ENGINEER FOR PROFESSIONAL SERVICES RELATED TO THE CABARRUS COUNTY SOLID WASTE PROGRAM FURTHER DESCRIPTION OF BASIC SERVICES, DUTIES OF OWNER, METHOD OF PAYMENT, AND RELATED SERVICES This AMENDMENT to THE AGREEMENT made as of Februarv 14, 2007 is hereby included as an addition to and incorporated as part of the AGREEMENT FOR ENGINEERING SERVICES made on Februarv 4,1991, between Cabarrus Count North Carolina (OWNER or COUNTY) AND Cam Dresser & McKee (ENGINEER or CDM) for professional services. CABARRUS COUNTY SOLID WASTE MANAGEMENT DESIGNIBIDDING SERVICES FOR CLOSURE OF THE EXISTING C&D LANDFILL The purpose of this amendment is to provide Cabarrus County Solid Waste Management with design/bidding services for closure of the existing C&D Landfill located at 4441 Irish Potato Road (SR 2411), Concord, North Carolina. Transition Plans approved by the NCDENR Solid Waste Section in January 1998 and March 1999 permitted C&D waste to be disposed of on top of the closed Unit 3 MSW Landfill, representing a combined Phase 1 and Phase 2 C&D waste disposal area of approximately 14 acres. (Note: The exact number of acres to be closed, in addition to the actual limits of waste are to be determined by CESI survey under contract with Cabarrus County prior to design). Closure of the partially filled Unit 3 MSW Landfill was first completed in March 1999, in accordance with 15A NCAC 13B Section .1627 of the North Carolina Solid Waste Management Rules, requiring a soil cap meeting a maximum permeability of 1 x 10'5. The average permeability achieved during closure was, however, 5 x 10-' as presented in the CQA Document prepared by CDM and submitted to the SWS on March 5,1999. North Carolina Solid Waste Regulations Section .1627(c)(1)(A) states that the closure cap for the C&D waste piggy-backed on top of the lower Unit 3 MSW Landfill must achieve a permeability less than or equal to the permeability of that achieved for the lower MSW closure cap. This will then require the closure cap for the C&D Landfill to be the equivalent or less than the 5 x 10'' average permeability achieved for the lower MSW landfill closure. This can be accomplished by constructing an 18-inch thick compacted clay soil cover meeting a maximum permeability of 5 x 10-' or a composite .liner/drainage system with 18-inches of cover soil with no specified permeability requirement. In either case, a 6-inch vegetative cover layer would be required over the 18-inch soil cover layer. CDM will consider alternate closure designs with regard to cost and material availability. In addition to closure design and bidding services, this amendment will also address design of a landfill gas collection and passive venting system to be incorporated into the closure cap. It is understood that CESI will provide the survey for design of the C&D Landfill closure, to Page 1 of 7 ~-