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EXHIBIT A -3 <br />HL]IT -ZOLLARS <br />HUITT- ZOLLARS, INC. - 430 Exchange - Suite 200 a Irvine, CA 92602.1315 a 714.734.5100 phone 1 714.734.5155 fax 1 huitt•zollars.com <br />February 26, 2010 <br />Revised <br />Mr. Kenny Nguyen <br />City of Santa Ana <br />Design Engineering Section <br />20 Civic Center Plaza, M -36 <br />P. O. Box 1988 <br />Santa Ana, CA 92702 <br />RE: Change Order No. 2; Alton Avenue Overcrossing PS &E <br />HZ Project No. 10- 1378 -01 <br />Dear Mr. Nguyen: <br />Huitt- Zollars, Inc. ( Huitt- Zollars) appreciates the opportunity to provide professional services to <br />the City of Santa Ana (Client) for the Alton Avenue Overcrossing PS &E project. <br />This amendment is being submitted for: <br />• Augmenting the Traffic Report with an additional scenario — 2015 with HOV Ramps — as <br />discussed at the team meeting on February 9, 2010. <br />• Restructuring the Traffic Report into a Traffic Impact Report following FHWA/Caltrans <br />environmental guidelines. <br />• Preparing a Supplemental Historic Property Survey Report, Historical Resources Evaluation <br />Report, and Department of Parks and Recreation forms (DPR 523) for properties that must be <br />evaluated to determine if they are historic as discussed at the team meeting on November 10, <br />2009. <br />• Preparing a jurisdictional delineation as discussed at the team meeting on November 10, <br />2009. <br />• Performing an additional air quality analysis using the data from the new traffic scenario — <br />2015 with HOV Ramps. <br />The scope for these activities is presented below. No other effort beyond that specifically <br />stated in this scope of work is assumed or implied. <br />EXHI B iT A? <br />