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ATTACHMENT 3 SIXTH AMENDMENT TO AGREEMENT This Sixth Amendment to Agreement ("Sixth Amendment") is entered into this day of 2013, by the City of Pleasanton("City") and T.Y. LIN INTERNATIONAL ("Consultant"). Whereas, on July 20, 2010, the City and Consultant entered into an Agreement for Professional Services ("Agreement") for the preparation of Plans, Specifications and Estima:es (PS&E) and Environmental Certifications for the I-580 Interchange Improvements at Foothill Road (Agreement 10- 663C); and Whereas, on July 19, 2011, the City and Consultant entered into a First Amendment to the Agreement for Professional Services for the preparation of retaining wall designs, supplemental traffic forecasts, and an updated Natural Environment Study(NES) for the Interchang;; and Whereas, on January 17, 2012, the City and Consultant entered into a Second Amendment to the Agreement for Professional Services for the preparation of retaining wall hard copy mapping, right of way appraisal and acquisition services, and a utility encroachment exception; and Whereas, on March 31, 2012, the City and Consultant entered into a Third Amendment to the Agreement for Professional Services for additional information and exhibits for the Natural Environmental Study (NES), including information on vegetation communities and additional exhibits, discussion on the presence of California Red Legged Frog and Alameda Whipsnake habitat within 3,000 feet of the project limits; and Whereas, on July 17, 2012, the City and Consultant entered into a Fourth Amendment to the Agreement for Professional Services for one additional pothole, as required by Caltrans, of the gas line in the area between the existing EB off-ramp and EB loop on-ramp; and Whereas, on June 7, 2013, the City and Consultant entered into a Fifth Amendment to the Agreement for Professional Services for providing assistance as required during the advertising and bidding period in order to respond to questions from contractors, attend a pre-b id meeting; and assist City staff in preparing contract addenda; and Whereas, the Consultant's assistance is required to provide design services during construction to respond to request for information from the contractor, review contractor submittals as required, provide geotechnical oversight and assistance, attend meetings, and prepare construction record drawings; and Whereas, the parties desire to amend the Agreement; Now, therefore, the parties agree as follows: 1. Section 1 of the Agreement is amended to expand the scope of services to include design services during construction to respond to request for information from the contractor, review contractor submittals as required, provide geotechnical oversight and assistance, attend meetings, and prepare construction record drawings. 2. Section 4 of the Agreement is amended to increase compensation by$84,724, for a total compensation amount of$616,918. Page 1