C1

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Construction
Lead Staff Debbie Futaba
OFFROAD2007_Nov01_Release
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Statewide tpd Comparison (Summer)
- Activity units total hrs/day
Benchmark up to CY2020 only
Difference (Statewide)
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SCAB tpd Comparison (Summer)
- Activity units total hrs/day
Benchmark up to CY2020 only
Difference (SCAB)
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• Revisions to the Construction category (gt25hp)
• Population
• Updated based on ARBs Off-Road Equipment Survey
  (2005)
• Removed equipment considered to be
  Cargo-Handling Equipment (CHE)
• Crane
• Excavator
• Off-Hwy Truck
• Tractor/Loader/Backhoe
• Activity (hr/yr)
• Updated based on MacKay Study (2003)
• Activity by age

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Revised 2000 Population Visual
Statewide
Updated Annual Activity (hr/yr) Visual
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(Continued)

• Revisions to the Construction category (gt25hp)
• Useful Life
• Increased based on ARBs Off-Road Equipment
  Survey (2005)
• Maximum age is now 64 years as compared to 32
  years
• Emission Factors
• Deterioration rate capped at 12,000 hours
• To account for rebuild (ARBs Off-Road Equip
  Survey (2005))
• U.S. EPAs Tier 4 emission factors incorporated
• Age distribution
• Updated based on ARBs Off-Road Equipment Survey
  (2005)
• Growth factors
• Reflected a 1.96/year increase starting in 2001
• Based on construction employment data from REMI
  (2001)

Inventory
Inventory
Inventory
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Equipment Useful Life Increase Visual
2000 Tier 0 Percentages (Impact of Age
Distribution)
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2020 Tier Distribution Visual
Excavator
Benchmark
OFFROAD2007
Tractor/Loader/Backhoe
Benchmark
OFFROAD2007
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Construction Growth Visual
Revised growth increases 1.96/year starting in
2001
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Statewide vs. South Coast Air Basin
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Impact of Revisions Summary
OFFROAD2007 Construction Inventory Summary