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SUBJECT: POTENTIAL BALLOT TRANSPORTATION TAX DISCUSSION <br />DATE: JUNE 17, 2021 <br />PAGE2OF8 <br />high bid can vary as much as 30% dependent on contractor availability and regional <br />workloads. <br />The high recommended contingency allows for providing initial expectations that are <br />more likely to be built given the many variables impacting such a large program. <br />Expected Range of <br />Accuracy <br />AACE <br />Class <br />ANSI <br />Classification <br />Typical Use <br />Project <br />Definition <br />Low <br />Expected <br />Actual <br />Cost <br />High <br />Expected <br />Actual <br />Cost <br />Other Terms <br />ClassS <br />Order -of- <br />Magnitude <br />Strategic Planning; <br />Concept Screening <br />0%to 2% <br />-50%to - <br />20% <br />+30%to <br />+100% <br />ROM; Ballpark; Blue Sky; <br />Ratio <br />Class 4 <br />Feasibility Study <br />1% to <br />15% <br />-30% to - <br />15% <br />+20%ta <br />+SO% <br />Feasibility; Top -down; <br />Screening; Pre -design <br />Class <br />Budgetary <br />Budgeting <br />10%to <br />40%detailed <br />-20%to- <br />10% <br />+10%to <br />+30°/n <br />Budget; Basic <br />Engineering Phase; Semi- <br />Class 2 <br />Definitive <br />Bidding; Project <br />Controls; Change <br />Management <br />30% to <br />75% <br />15%tv <br />5% <br />+5% to <br />+20°/n <br />Engineering; Bid; <br />Detailed Control; <br />Forced Detail <br />Class 1 <br />Bidding; Project <br />Controls; Change <br />Management <br />65% to <br />100% <br />-10%t❑ - <br />3% <br />+3% to <br />+15% <br />Bottoms Up; Full Detail; <br />Firm Price <br />Figure l <br />As the underpass program development progresses risks will be mitigated and <br />uncertainty will become lower in cost estimation. However, additional cost will likely be <br />realized as further design progresses at each location and details become more specific <br />and unforeseen circumstances arise (Figure 2). <br />CITY COUNCIL COMMUNICATION <br />3 <br />