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I I II I I I I I I I I I I I I I I I II -30- CHAPTER V - ESTIMATED CDSTS V.I Costs of Construction Bid Items and Quantities - The following schedule of bid items was iden- tified for purposes of preparing feasibility level construction cost estimates for the preferred modification option. Item Number 1 2 3 4 5 6 7 8 Item Mobilization/Demobilization Clearing and Grubbing Topsoil Stripping and Stockpiling Open-Cut Excavation Mixing, Placing, and Compacting Soil-Cement Overtopping Protection Furnishing Cement for Soil-Cement Overtopping Protection Furnishing and Constructing Soil-Cement Underdrain System Furnishing and Installing Crest Raising Precast Concrete Retaining Wa 11 s 9 Placing and Compacting Random Fill For Crest Raising 10 Disturbed Area Reclamation Feasibility level estimates of the quantities of each of these bid items were made. Calculation sheets for these estimates are given in Appendix D under "Option 2 - Quantity Estimates." A sunrnary of the estimated quantities is shown in Table 3. Unit Cost Estimates - Unit cost estimates were made for each of the bid items described in Section V.l.l. These estimates are given in Appendix D under "Option 2 - Unit Cost Estimates." The unit cost estimates were derived from several sources including Means Site Work Cost Data 1985 Edition, contractors with recent construction experience with similar projects, construction contract bonding agents, fabricators and material suppliers, and the Portland Cement Association. All unit prices were escalated to reflect 1987 costs. Projected price increases for 1988 construction are described in Section V.1.5.