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C-81-019 2005 Midterm Review May 5, 2005 Division offers Colowyo an opportunity for an informal conference on such an adjustment. Numerous assumptions and several major differences between the Division estimate and the cost estimate of the PAP aze detailed below. The Division checked and concurs with the spoil and highwall volumes provided by the PAP estimate (by digitizing the appropriate pit cross-sections). The Division used the volumes in the PAP estimate because they aze deemed to be more accurate (as they aze, most likely, calculated using AutoCAD-or a similar software package). Therawere minor dissrepansies,-such-as-some topsoil volumes and all of the pond embankment volumes as discussed following. The Division concurs with the basic assumptions and methodologies used to develop the estimate in the PAP. The details of haul rout calculations for truck/loader and scraper tasks aze not described in the PAP estimate, so it is difficult to determine where, exactly, the cost increases came from. The Division agrees with equipment selection with one exception. The Division chose to use a CAT 773D haul truck (54 ton capacity) versus a CAT 777D haul truck (100 ton capacity). It is the Division's position that, while the CAT 777D haul trucks aze excellent for moving mass quantities of earth (or coal, as in mining), they aze not generally available for contracting purposes. The 773D haul trucks aze readily available. A major variance between the mid-term estimate and the PAP estimate relates to the West Fit overburden stockpile (Division Task 010). Although movement of the applicable portions of this overburden stockpile is addressed in the text of the PAP, no quantity and associated cost was identified in the PAP estimate work descriptions. Removal of the upper 74-feet of the West Pit overburden stockpile was included as a line item in the Division estimate. A calculated volume of 2,705,000 compacted cubic yazds is moved back to the West Pit (a haul distance of 4,000 feet). Moving this material was accomplished by two fleets of CAT 992 G loaders (2) and CAT 773D haul trucks (8). The material was then spread using CAT D10R dozers (2). It was also assumed that one CAT D l OR dozer would be required to assist in the loading operations. Additionally, as with all truck/loader and scraper tasks which require roads, a CAT 14H motor grader and a 5,000-gallon water truck were also used (at 25%) for road construction and maintenance. Overall, this task required 1,591.21 hours to complete at a cost of $3,250,414.00. The second major discrepancy between the two estimates deals with equipment costs. The costs in the PAP estimate aze low (for 2005) across the boazd. The following chart shows equipment costs used by both the Division and PAP estimates. E ui ment DMG Hrl Cost PAP Hrl Cost Difference % Difference D10RDozer $201.14 $165.80 $35.34 21.3% 637G Scra er $245.47 $202.16 $43.31 21.4% 773D/777D Tk $134.39 $187.51 -$53.12 -28.3% 992GLoader $225.03 $195.27 $29.76 15.2% 14H Grader $95.80 $70.38 $25.42 36.1% SK501 Drill $254.78 $154.86 $99.92 39.2% 14