2008-06-20_REVISION - C1981044 ‎(2)‎

• Permit No: C1981044
• IBM Index Class Name: REVISION
• Doc Date: 6/20/2008
• Doc Name: Memo & Cost Estimate
• From: Jim Stark
• To: File
• Type & Sequence: RN5
• Media Type: D
• Archive: No

HOURLY PRODUCTION sheet 2 of 2
Hauling Capacity :
Scraper Payload (weight) Basis : Scraper Bowl (volume) Basis :
Material weight : 2, 650
Material description :
Decomposed rock - 25% Rock, 75% Earth
Rated payload : 75,000
Payload capacity: 28.30
Cycle Time :
Scraper loading time * : 1.00
Maneuver and spread time : 0.60
' load time per scraper pair on push-pull models
pounds/LCY
pounds
LCY
Struck volume : 24.00 LCY
Heaped volume : 34.00 LCY
Average volume : 29.00 LCY
Adjusted capacity : 28.30 LCY ***
hourly production reflects volume per scraper pair on push-pull models
Job Condition Corrections : Site altitude (ft.) : 5,400
Scraper Push dozer Source
minutes Altitude adj.: 1.000 NA (Cat HB)
minutes Job efficiency : 0.830 NA (Cat HB)
Net correction : 0.830 NA
Travel time :
Road condition description :Rutted din, little maintenance, no water, I" tire penetration
Haul Route :
Seg. # Haul distance (feet) Grade (%) Roll. res. (%) Total res. (%) Velocity (fpm) Travel time (min.)**
1 2,460 7.50 2.00 9.50 922 2.70
2 940 6.00 4.00 10.00 922 1.02

Return route :
Haul time : 3.72 minutes
1 940 -6.00 4.00 -2.00 2972 0.39
2 2,460 -7.50 2.00 -5.50 2972 0.33

" travel time for each segment is adjusted for acceleration/deceleration. Return time : 0.72 minutes
table velocities are max. attainable per total resistance shown, not average
Total scraper team cycle time (load + haul + maneuver and spread + return) : 6.04 minutes
Unadjusted unit production/hour : 562.15 LCY/hour *** Adjusted for job conditions : 466.58 LCY/hour
Optimal number of scrapers per push dozer : NA Selected number of scrapers : 2 scraper(s)
Adjusted single scraper team (unit) hourly production : 466.58 LCY/hour
Adjusted multiple scraper team (fleet) hourly production : 466.58 LCY/hour