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Exhibit A April 2, 2018 Mr. Mike Lopez City of Santa Ana 20 Civic Center Plaza Santa Ana, CA 92701 Subject: Proposal for Thornton Park Lake Temporary Repair Consulting Services Dear Mr. Lopez: Thank you for giving us the opportunity to submit our proposal to assist the City of Santa Ana in the necessary temporary repairs for the Thornton Park Lake. The Dudek team is poised to assist the City will all of their lake consultation needs. Project Understanding and Approach We understand the City has drained down the Thornton Park Lake in an effort to identify and repair a leak in the lake wall. During the drain -down it was determined that the lake liner system is in poor condition and is in need of rehabilitation. It is thought that the saturated soils along the lake edge in the vicinity of the southerly portion of the lake could be due in part to leakage through the lake bottom liner as well as through the lake edge wall. Dudek observed the area of the leak and condition of exposed portion of the lake wall and bottom liner on March 27, 2018. Due to the very poor condition of the PVC lake bottom liner, we recommended that the City implement a temporary repair to the lake wall and a portion of the lake bottom to mitigate the saturated soils condition and address the overall lake liner condition in a separate lake rehabilitation project. In our opinion, the existing liner system has performed beyond its service life and has expired, and is in need of complete rehabilitation. Scope of Services Dudek will provide general lake repair consultation consisting of developing design detail drawings and specifications for a contractor to construct a temporary repair in the southerly portion of the lake edge. Dudek will attend project meetings, site meetings, and participate in conference calls as requested by the City to provide guidance and consultation on the repair. Fee Dudek proposes a Time and Materials (T&M) fee not to exceed $3,600.00. This fee allows for a maximum of 17 man-hours to provide the services described above to the City. We appreciate the opportunity to submit this proposal and we look forward to assisting the City with this project. If you have any question or wish to discuss our proposal please contact me at 949.212.0916 or jsmith@dudek.com with any questions about our proposal. Thank you. Sincerely, J