2009-10-13_REVISION - C1981028

• Permit No: C1981028
• IBM Index Class Name: REVISION
• Doc Date: 10/13/2009
• Doc Name: Review Letter & Cost Estimate
• From: DRMS
• To: Coors Energy Company
• Type & Sequence: SR1
• Email Name: JHB
• Media Type: D
• Archive: No

HOURLY PRODUCTION
Haulinq Capacity :
Scraper Payload (weight) Basis :
Material weight :
Material description
Sand - Damp
2,850 pounds/LCY
Rated payload : 75,000 pounds
Payload capacity : 26.32 LCY
sheet 2 of 2
Scraper Bowl (volume) Basis :
Struck volume : 24.00 LCY
Heaped volume : 34.00 LCY
Average volume : 29.00 LCY
Adjusted capacity : 26.32 LCY
hourly production reflects volume per scraper pair on push-pull models
Cycle Time : Job Condition Corrections : Site altitude (ft.) : 5,000
Scraper Push dozer Source
Scraper loading time 1.00 minutes Altitude adj.: 1.000 NA (Cat HB)
Maneuver and spread time : 0.60 minutes Job efficiency : 0.830 NA (Cat HB)
* load time per scraper pair on push-pull models Net correction : 0.830 NA
Travel time :
Road condition description :Soft, rutted dirt, no maintenance or water, 4" tire penetration
Haul Route :
Seg. # Haul distance (feet) Grade (%) Roll. res. (%) Total res. (%) Velocity (fpm) Travel time (min.)**
1 600 0.00 8.00 8.00 1131 0.58

Haul time : 0.58 minutes
Return route :
** travel time for each segment is adjusted for acceleration/deceleration. Return time:
table velocities are max. attainable per total resistance shown, not average
Total scraper team cycle time (load + haul + maneuver and spread + return)
Unadjusted unit production/hour : 1,218.80 LCY/hour *** Adjusted for job conditions
Optimal number of scrapers per push dozer : NA Selected number of scrapers
Adjusted single scraper team (unit) hourly production
Adjusted multiple scraper team (fleet) hourly production
JOB TIME AND COST
Fleet size : 1 Team(s) Total job time
Unit cost : $0.875 /LCY Total job cost
0.41 minutes
2.59 minutes
1,011.60 LCY/hour
2 scraper(s)
1,011.60 LCY/hour
1,011.60 LCY/hour
4.85 Hours
$4,292