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 sheet 2 of 2
Hauling Capacity :
Scraper Payload (weight) Basis :
Material weight : 2,850 pounds/LCY
Material description
Sand - Damp
Rated payload : 75,000 pounds
Payload capacity : 26.32 LCY
Cycle Time :
Scraper loading time * : 1.00 minutes
Maneuver and spread time : 0.60 minutes
* load time per scraper pair on push-pull models
Travel time :
Road condition description :Firm, smooth, rolling
Haul Route :
icraper 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
Job Condition Corrections : Site altitude (ft.) : 5,000
Scraper Push dozer Source
Altitude adj.: 1.000 NA (Cat HB)
Job efficiency : 0.830 NA (Cat HB)
Net correction : 0.830 NA
dirtllt. surfaced, watered, maintained
Seg. # Haul distance (feet) Grade (%) Roll. res. (%) Total res. (%) Velocity (fpm) Travel time (min.)**
1 1,400 1.00 3.00 4.00 2394 0.84

Haul time : 0.84 minutes
Return route :
** travel time for each segment is adjusted for acceleration/deceleration. Return time : 0.61 minutes
table velocities are max. attainable per total resistance shown, not average
Total scraper team cycle time (load + haul + maneuver and spread + return) : 3.05 minutes
Unadjusted unit production/hour : 1,035.22 LCY/hour *** Adjusted for job conditions : 859.24 LCY/hour
Optimal number of scrapers per push dozer : NA Selected number of scrapers : 2 scraper(s)
Adjusted single scraper team (unit) hourly production : 859.24 LCY/hour
Adjusted multiple scraper team (fleet) hourly production : 1,718.47 LCY/hour

JOB TIME AND COST
Fleet size : 2 Team(s) Total job time : 93.79 Hours
Unit cost : $1.100 /LCY Total job cost : $177,269