Phoenix Sky Harbor International Airport - Aviation Environmental

Phoenix Sky Harbor

PowerPoint Presentation

Slide 1

ADEQ Arizona Pollutant Discharge Elimination System (AZPDES) General Permit for Discharge from Construction Activities to Waters of the United States 2008

Impacts to the CNRP Final

Treatment/Stabilization Process


Slide 2

Today’s Presentation

  • Review of AZPDES Permit Changes
  • ADEQ’s approved forms of soil stabilization
  • Current VARS Soil Stabilization/Dust mitigation plan
  • Current soil stabilization product used by VARS, how it works, who has been using, it and finally for what applications
  • How Soiltac® stacks up to the current ADEQ allowed forms of permanent stabilization
  • Cost Benefit Analysis

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Slide 3

Review of the AZPDES permit Changes

How has it changed?

  • City must submit a general NOI to ADEQ
  • Contractors must submit neighborhood or individual NOIs to ADEQ
  • Contractors must provide temporary stabilization or initiate final stabilization within 14 days of the most recent land disturbance
  • Contractors must submit NOTs within 30 days of
    • Final stabilization has been achievement
    • Another operator assumes control over the site


Slide 4

ADEQ’s approved forms of soil stabilization

How does the new permit define stabilization?

  • A uniform perennial vegetative cover with a density of 70% of the native background (Virgin Desert) vegetative cover for the area is in place.  If 50% vegetative cover exists prior to construction activities then 70% of the 50% would be accepted.
  • Equivalent permanent stabilization measures (such as the use of riprap, decomposed granite, gabions, or geotextiles) have been employed


Slide 5

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Slide 6

Current VARS Soil Stabilization/Dust Mitigation Plan

  • In order to meet county dust control requirements, VARS is applying a polymer based soil stabilizer to the ground surface.  This stabilizer is under warranty for one year and a maintenance plan is in place to resolve issues after that year as needed.
  • The product we have been using is SOILTAC by Soilworks®.  Soil stabilizers of these type are not currently approved as a form of final stabilization by the AZPDES permit.
  • As a result we would like to present the following information about the polymer based soil stabilizer currently used by the VARS program to ADEQ for their consideration as a final stabilization measure


Slide 7


  • Synthetically Manufactured Vinyl Copolymer
    • Similar properties to liquid plastic adhesives
    • Prime material manufactured molecule by molecule, not a by-product
    • Ecologically and environmentally safe
    • Soil stabilizer engineered to solidify any soil or aggregate

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Slide 8

How Soiltac Works

  • Utilizes water as a carrying and compaction agent
  • As water evaporates, Soiltac molecules coalesce, link and cross-link together
  • Adhere & Bind Dust & Soil Particles
  • Form a strong & tightly bound matrix
    • Topical Surface Stabilization
    • Mix-in/Processed Stabilization

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Slide 9

Soiltac Uses and Rates

  • Soil Stabilization
    • Heavy  Application Rates
    • Road Construction, Runways, Helipads, Sub-Bases, etc.
  • Water Erosion Control
    • Medium Application Rates
    • Slopes, Berms, Golf Bunker Stabilization, Dikes, etc.
  • Wind Erosion Control
    • Light Application Rates
    • PM10 Dust Stabilization/Air Quality, FOD Control, etc.


Slide 10

How does Soiltac stack up when compared to ADEQ approved forms of permanent soil stabilization?


Slide 11

Soiltac vs. Vegetative Cover

  • Ease of application
  • Conserves water resources
  • Minimal maintenance
  • Requires seeding
  • Daily irrigation
  • Continual maintenance
  • Potential fire hazard

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Slide 12

Soiltac vs Riprap

  • Proven effectiveness with soils <0.075 mm
  • Stabilization inhibits vegetative growth
  • Preserves native background
  • Typically used on shorelines
  • Requires vegetative maintenance and Geotextile
  • Extensive installation transportation and removal

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Slide 13

Soiltac vs. Decomposed Granite

  • Long term PM10 control
  • Prevents storm water silt loading
  • Water Resistant; will not wash away
  • Eliminates Import/Export
  • Possibility for Opacity still eminent without stabilization
  • Storm water silt hazard
  • Requires depth >2”
  • Requires periodic maintenance or underlay

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Slide 14

Soiltac vs. Gabions

  • Engineered for use on level or sloped surfaces
  • Increases wet and dry strength of any soil
  • Used for retaining walls
  • Designed for vertical applications
  • Not reasonable for flat stabilization

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Slide 15

Soiltac vs. Geotextiles

  • Designed for surface and/or subterranean application
  • Ultraviolet ray resistant
  • Not designed for surface application
  • Rapid deterioration with exposure to sunlight
  • Continued vegetation management evident

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Slide 16

Known Geotextiles Considerations

  • Products deteriorate significantly with age
  • Adverse weathering reaction in desert environment (Decomposition)
  • Up to 70% reduction in strength at 500 of direct sunlight hrs per ASTM D-4355
  • Most geotextile fabrics are ineffective after 60 days of sun exposure


Slide 17

Recent Final Stabilization Projects Utilizing Soiltac Soil Stabilizer

  • ADOT Unpaved Road Stabilizer 11/05
  • US Army Corp of Engineers - Helipad Stabilization 4/04 & 2/06
  • Marine Corp Air Grounds Combat Center 7/07
  • Khumani Mine 300 Ton Heavy Haul Roads - South Africa 3/07
  • California Dept of Transportation 10/06
  • New Mexico Dept of Transportation 6/07
  • Nevada Dept of Transportation 11/04
  • US Army Corps of Engineers - Rapid Airfield Construction 8/07
  • U.A.E. Army - 600 km Saudi Arabian Border Patrol Roads 8/05
  • US Army Corps of Engineers - Base Camp Operations 3/05 & 10/05


Slide 18

ADEQ Considerations for Final Stabilization with Soiltac

•           Engineered to solidify any soil or aggregate

•           Permanent with minimal maintenance

•           Ecologically and environmentally safe

•           Easy to apply

•           Conserves resources

•           Preserves native background

•           Long term PM10 control

•           Water and UV resistant

•           Prevents storm water silt loading

•           Designed for surface and subterranean use

•           Eliminates Import/Export

•           Increase wet and dry strength of any soil

  • Already approved through Maricopa County as a Dust Suppressant


Slide 19

Assumed Cost Summary*

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