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EXHIBIT C4 <br />ESTIMATED 20 -YEAR O &M COSTS BREAKDOWN' <br />I <br />Contract Administration <br />$1.00,000 <br />2 <br />Inspection (monthly) <br />$240,000 <br />3 <br />Solids Handling and Disposal (monthly) <br />$430,000 <br />4 <br />Boom Reset (2 -year cycle) <br />$30,000 <br />5 <br />Repair of Equipment <br />$150,000 <br />6 <br />Diversion Utility Costs <br />$50,000 <br />Total <br />$1,000,000 <br />* O &M costs will be evaluated annually in accordance with the terns <br />herein. <br />3 Amounts above are estimates from an Opinion of Probable Construction Cost referenced as "Engineer's Estimate <br />15 -058" by AECOM dated 7/24/2015 based upon 60% Design Plans. Estimates include .5% allowance for All Risk <br />Insurance and Wage Rates based upon prevailing wage rates for Orange County, California. Total wage rate <br />includes hourly wage plus craft fringes and 32% burden with a typical work week of 1 eight hour shift per day/ <br />five days per week. The Parties acknowledge OCFCD and COSTA MESA burden rates as indicated in Sections 3.7 <br />and 5.9 exceed that used to formulate the estimate above, and mutually agree OCFCD and COSTA MESA shall be <br />fully compensated based upon their respective burden rates per the terms of this Agreement. <br />Santa Ana -Delhi Channel Diversion Project Agreement D15 -013 <br />25G -50 <br />Page 46 of 74 <br />