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EXHIBIT 4 <br /> AUTHORIZATION OF CHANGE IN SERVICE <br /> CONTRACT NAME: Castle Forest Channel Improvements NUMBER: 219-069 <br /> CONTRACTOR: HDR Engineering,Inc. <br /> ORIG.CONTRACT DATE: 1/31/18 RESOLUTION NO: <br /> CITY REPRESENTATIVE: Rey Garcia, PE DEPT: <br /> DATE: 7/20/22 ACIS NO.: 2 <br /> DESCRIPTION OF WORK TO BE ADDED TO OR DELETED FROM SCOPE OF SERVICES: <br /> Change in Service #3 is to develop the PS&E package for design alternative 2 identified in <br /> the PER. Services include H&H modeling to optimize an off-site development detention <br /> pond (Mystic Canyon) along with providing engineering design of ponds, storm drains and <br /> channel improvements. This phase of the project will implement design components that <br /> reduce the 1% annual chance flood risk for the Castle Forest Subdivision. <br /> Origirtal Contract Amount: $ $155,862.00 <br /> Previous Increases/Decreases in Contact Amount: $ $24,472.00 <br /> CURRENT CONTRACT AMOUNT: $ $180,334.00 <br /> This Increase/Decrease in Contract Amount: $ $283,868.00 <br /> REVISED CONTRACT AMOUNT: $ $464,202.00 <br /> CONTRACTOR: <br /> signed Warrix,Todd <br /> Warrix, Todd Clay Date:Digitally 2022.07.20by16:04:17-05'00'Clay 7/20/20 <br /> Signature Date <br /> Todd Warrix, PE/Associate Vice President <br /> Print Full Name/Title(if not in individual capacity) <br /> CITY' <br /> Signatu'i*c' Dat <br /> ta. <br /> Print Name yide <br /> GPepaitnent Use On!y Below This Line PM,POC,etc.2. <br /> Account Number(s): Amount Date <br /> $ <br /> $ <br /> 02/21/17 Rev.05.25.2021 Page 1 of I <br />