4628 hartmann - apwa.net
TRANSCRIPT
9/8/2009
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AAA:Ai A h lt d AllAir, Asphalt and Alleys
How the city of Chandler, Arizonaused innovation to clean the air
and meet a state mandate
Rex Hartmann and Alberto Fausto
Chandler, Arizona
Suburb of PhoenixSuburb of Phoenix252,017 population837 center-line miles
of paved streets130 miles of alleys80 sq. mile area
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PM-10 sources and cause(dust)
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2005 PM10 Emissions Inventory (Revised May 2007 – PM10 Nonattainment
Area Total = 84,753 tons/yr)
1.9% 3.8%
6.6%
3.2%
10.0%
13.4%16.3%
Stationary point sources
Industrial processesFuel combustion & fires
Agriculture
Construction (residential)Construction (commercial)
Construction (road)
13.1%
8.5%
8.7%
3.6%2.5%
1.0%
2.4%
2.1%
2.9%
Construction (road)Other earthmvg (trenching, weed cntrl)
Travel on unpaved parking lots
Offroad rec. vehicles fugitive dustLeaf blowers fugitive dust
Windblown fugitive dust
Nonroad mobile sourcesExhaust/tire wear/brake wear
Paved road fugitive dust (incl. trackout)Unpaved road fugitive dust
Courtesy of Maricopa County
PM-10 clarification and negative aspects
• Air Quality• Health Issues• Loss of Federal• Loss of Federal
Funds
• Random Inspections• Monitoring Stations
PM-10 control efforts
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Reason for PM-10 Alley project(fugitive dust reduction)
• Fines• Project Repercussions• Chandler committed to county-wide
efforts to achieve 5% reduction in airborne particulates per year
Regularly scheduled street rehabilitation projects produce asphalt millings as a byproduct
Millings are hauled to and stockpiled at City dump sites
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Crushing, storage andrecycling of asphalt millings
Alley crew responsibility (grubbing, trimming
and cleaning of alleys)
Coordinating trash can removal
Customized grappling attachment on front loader
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Coordination with utility companies
Cutting alley to grade with asphalt roto-mill
• Time saved over using a grader to achieve same result
• Remove and haul away alley soils• Contractor responsible for disposal;
soil sold as fill material
Cutting alley to grade with asphalt roto-mill
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Issues with cut linesCoordination with residents
• Notifications to residents• Minimize inconvenience
Alley sub-grade prep• Rolling, Watering & Compacting sub-
grade
Hauling millings to alley job-site
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Laying millings down in alleys with asphalt paving machine
Milling Preparation
• Rolling, watering and compacting millings
Alley milling compaction testing
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Seal alley millings with SS-1h oil,Using water to help oil penetrate
into the millings
Coordinate trash can replacement in alleys
Alley Stabilization by the numbers
•Current contract amount:$612,795 ($5.00 per Sq Yd)
•2008 stabilized 10.6 miles of alleysand 7.3 curb miles of shoulders
•2009 15.8 miles of alleys and 2.0 curb miles of shoulders
•2010 plan 13.8 miles of alleys
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2009 Project Materials:
• Crushed 20,500 tons of asphalt millings and used about 20 000 tons in theand used about 20,000 tons in the alleyways
• 1,500 gallons of oil sprayed at a rate of 0.10 to 0.15 gallons per Sq Yd.
Final product, lower dust contaminates and public
pride in neighborhoods
Thanks - Q & A