9/8/2009

1

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

____

PM-10 sources and cause(dust)

9/8/2009

2

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

sy o

f M

aric

opa

Coun

ty

Phot

o co

urte

sy o

f M

aric

opa

Coun

ty

Phot

o co

urte

9/8/2009

3

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

9/8/2009

4

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

9/8/2009

5

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

9/8/2009

6

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

9/8/2009

7

Laying millings down in alleys with asphalt paving machine

Milling Preparation

• Rolling, watering and compacting millings

Alley milling compaction testing

9/8/2009

8

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

9/8/2009

9

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