Potential Solutions Relative to Dust Control. Las Cruces, New Mexico May 2009

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1 Potential Solutions Relative to Dust Control Las Cruces, New Mexico May 2009

2 Best Management Practices Water Track-out Control and Maintenance Surfactants Suppressants Phasing Wind Fencing Grading Landscaping Vegetation

3 Water Trucks

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5 Cost / Dust Control Costs $55 / Hour $90 / Hour Annually $114,400 year $187,200 year Necessity on Active Sites Quick Fix / Short Term Solution Needed on Inactive Sites Daily if alternative stabilization methods have not been implemented

6 Additional Costs / Considerations Cost of Water Cost of Water Delivery System Soil Types and Size of Site Multiple Trucks Site Shut Downs when unavailable

7 Track-out Control Devices

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10 Costs / Gravel Pads Costs $2,000 Initial Set Up $18 - $25 a ton rock Annually $35K $60K Required on all Sites at all exit points Helps Reduce reentrainment caused by paved road dust High Level of Maintenance Required

11 Costs / Shakers Costs $3,500 Initial Set Up $300 $500 month Rental Rate $12,000 Each Set - Purchase Annually $45K $70K Required on all Sites at all exit points Helps Reduce reentrainment caused by paved road dust Medium / Low Level of Maintenance Required Need three (3) sets to substitute for Gravel

12 Costs / Wheel Wash Costs $5,500 Initial Set Up $3,500 month Rental Rate $75, Purchase Annually $55K $85K Cost Required on all Sites at all exit points Helps Reduce reentrainment caused by paved road dust Medium / Low Level of Maintenance Required Need three (3) sets to substitute for Gravel

13 Additional Costs / Considerations Equipment Costs Rip, refresh and re-new devices Street Sweeping Costs $65 95 an hour $50K - $75K annually Generator Needed for Wheel Wash # of Exits (less is better)

14 Surfactants Surfactant is the word that combines the terms "surface active agent". Chemical species that acts as wetting agents to lower the surface tension of a liquid and allow for increased spreadability.

15 Costs / Surfactants Costs Varied Dependant an acreage Reduces the amount of water required Helps throughout all phases of construction.

16 Palliatives / Suppressants Water- Attracting Chemicals Chlorides, Salts, Brine Solutions Organic Chemicals Lignosulfonates, Tall Oil Pitch, Vegetable Oils Polymers Polyvinyl Acrylics

17 Water-Attracting Chemicals Not recommended in arid or semi-arid areas. Need humidity levels of about 30% for it to pull moisture out of air

18 Organic Chemicals

19 Lignin Derivatives Increases dry strength of soil Not humidity dependant Needs proper aggregate mix to enhance performance Best use on Roads

20 Tall Oil Pitch Imparts plasticity to road surfaces High bonding strength Requires proper weather and time to fully cure Limited re-application, if enough product installed Need to work into soil

21 Polymers

22 Snots Downgraded product of Originals Vinyl versus acrylic Solids Rate is important

23 Other Suppressants Tars, Resins Cementitious Based Binders Organic Nonpetroleum Oils Bio-Diesel By Products Glycerin

24 Cost / Dust Control Costs Applied $600 an acre $7,000 an acre Cost Product $ $7.00 a gallon Application Rates $600 an acre 100 gallons per acre or less Topical Only 3-6 months no traffic $7,000 an acre 1,000 gallons an acre Disc 6-12 months no traffic

25 Drivable Surface??? Costs Applied $15,000 an acre Cost Product $ $7.00 a gallon Application Rates $15,000 an acre GSA or DG Needed Disc 1,500 2,000 gallon per acre minimum

26 Phasing Work Acre limitations Prevents clearing of massive amounts of land Permit restrictions Site Planning Before Development

27 Wind Fencing

28 Wind Fencing Need minimum 3-5 foot high 50% or less porosity

29 Roads / Parking Lots

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32 Signs

33 Opacity A condition of the atmosphere, or any part thereof, in which an air contaminant (particulate matter) partially or wholly obscures the view of an observer

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39 Unpaved Roads & Parking Lots Test Methods for Stabilization Test Methods: Opacity Test Method Silt Content Test Method

40 Equipment Required Sieve Kit Small whisk broom or paint brush Spatula w/out holes Small scale w/ ½ ounce increments Level surface required Shallow light weight container Basic calculator Cloth gloves Sealable plastic bags (if retaining samples) Silt Content test result form Maricopa County Air Quality Department Protecting our most vital natural resource - air

41 Soil Crust Determination (Drop Ball Test)

42 Threshold Friction Velocity

43 TFV Test Method

44 Dust Coordinators

45 Adopt Agriculture Practices

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50 Comments or Questions??? Cameron Flower Senior Environmental Manager Kitchell Environmental Services (office)