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�XIDMOQELING® <br />we au, de more, topoler. <br />August 13, 2015 <br />Mr. Rudy Rosas, P.f. <br />Senior civil Engineer <br />City of Santa Ana <br />220 S. Daisy Ave. M-85 <br />Santa Ana, CA 92703 <br />EXHIBIT A <br />f„ Fast I9untinglon Dive, Suite t30, Arcadia, CA 91006 <br />WMV.10ma chrig.mill 118V10440700 <br />r 62ri 7.44 0702 L info@idino0elingrmn <br />Subject: Proposal to Provide Water System Computer Model Solutions <br />for Fiscal Years: 2015-18 <br />Dear Mr, Rosas, <br />IDModeling, Inc. (IDM) Is pleased to submit this proposal to the City of Santa Ana (City) to <br />provide follow-on water system computer model solutions for fiscal years (FY) 2015.18, based <br />on the calibrated all -pipes water model delivered by IDM as part of the Water System Computer <br />Modeling Project, completed in August 2015. <br />This proposal Includes 6 primary tasks that serve to support the City's future water system <br />analysis, master planning, and operational efforts to maximize resources and make the most <br />impactful decisions possible with available resources and data. The following tasks will be <br />performed within the scope and term of this project: <br />Task 1— Hydraulic Model Evaluations and Support (FY2015-16) <br />Under this task IDM will perform the following model evaluations for City staff. <br />1. City-wide Water Quality Testing and Source Trace Analysis: Perform a multi -source trace <br />analysis under two demand conditions (high demand & low demand) to determine the <br />influence on a particular location from various supply sources. Results tables and figures <br />will be developed to display the results of the source trace analysis and assist the City with <br />gaining approval from CDPI-I for use of the model to reduce the number of water quality <br />samples when positive results are encountered. <br />2. Fuller Site Analysis: Analyze the benefits of two new groundwater wells or one <br />well/reservoir/pump station combination at the Fuller Site which is a vacant parcel across <br />from the Santa Ana train station. A brief summary technical memorandum will be <br />developed detailing the model results with associated results tables and figures and <br />recommendations for improvements at the Fullersite. <br />3. John Garthe to Walnut Station Transmission Main Analysis: Analyze the need/impact of a <br />new transmission main from John Garthe Station to Walnut Station and assess the benefits <br />of being able to move a large quantity of water from Garthe to Walnut under two (2) <br />different operating conditions. A brief summary technical memorandum will be developed <br />detailing the model results with associated results tables and figures and recommendations <br />for improvements. <br />4. EOCWD Water Purchase Analysis: Analyze the ability/benefits to purchasing water from <br />the East Orange County Water District and the impacts to system operations under two (2) <br />different operating conditions. A brief summary technical memorandum will be developed <br />