Investigation of methodologies to control dust on county roads in

Investigation of
Methodologies to Control
Dust On Township Roads
SDAT&T
Larry Weiss – Ken Skorseth
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The volume of traffic involved in the oil field
in western North Dakota has surpassed the
ability of counties to adequately maintain
their roads
Dust along county roads is having adverse
effects on county residents
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Adverse health effects to humans and animals
Damage to vegetation
Traffic hazard due to poor visibility
Increased road maintenance
Increased costs
Adverse effects on soil and water quality
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Mckenzie county has active dust control
program on 1400 miles of road
Annual budget of $1.3 million
Dedicated staff just for dust control
Dunn County has hired an out of state firm to
manage dust on 1200 miles of road
Provide dust control for ¼ mile around
residence with complaint
The “Silver Bullet” Counties are looking for
should:
1. Be easy to handle and apply
2. Provide control for a year
3. Allow the road to be maintained
4. Be cost effective – preferably inexpensive
5. Safe for traffic and the environment
Water
Magnesium chloride
Calcium chloride
Soil stabilizers
Synthetic polymers
Enzymes
Petroleum emulsions
Bio – based oils
Lignin sulfonate
Tall oil pitch
Oilfield brine
Crude oil
Aggregate modification
Reviewed available technologies
Selected technologies for further evaluation
Identified road test segments
Applied 9 dust control products
Dunn County – 11th Street SW
Mckenzie County – 154th Ave
Magnesium Chloride
Calcium Chloride
Durablend – calcium chloride with polymers
WISP – synthetic organic oil
Rhino Snot – acrylic copolymer
Coherex – petroleum emulsion
Durabond – lignin with additives
Oil field brine
Native clay
Good gravel is scarce
3 Mckenzie and one Dunn aggregate had no
P.I.
Scoria creates significant dust
Magnesium chloride is chemical of choice
Counties should include gradation and P.I.
specifications when bidding aggregate
Scoria should be used only on low traffic
volume roads such as drilling pads and site
access roads
To be effective, dust control products need to
penetrate the road surface or be mixed in
PRODUCT
DUST CONTROL INFORMATION
APPROXIMATE COST
CONTACT
Permazyme
$12,000-$16,000/mile
Base One
Corn Oil Acrylic
Resins
$0.28-$0.55/sq yd/inch of depth
Williams or Bowman County
Dunn, Golden Valley, Billings, Stark, or Bowman
County
$0.14-$0.15/sq ft, $16,000/mile
Dunn County
Calcium Chloride
Magnesium
Chloride
$455/ton, 1.5-2 lb/sq yd; $1.26/gallon Richland County, MT; McKenzie County
$8,000/mile (1st trmt); $4,900/mile
(addl trmt)
McKenzie, Dunn, or Burleigh County
Oil Field Salt Brine
Cement
Product is free, $135-$500/hr to apply Dunn or Bowman County
$60,000-$250,000/mile (depending on
depth)
Bowman County, Richland County, MT
Stabilock
$15,000/mile
Bowman County
(Products being tested in North Dakota oil field high traffic areas)
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Magnesium Chloride: This is probably the most widely used
product and it does reduce the amount of dust, however, the
dry conditions this summer reduced its effectiveness.
Calcium Chloride: Similar to magnesium chloride, this
product does reduce the amount of dust, but was affected by
the dry conditions. This product is more expensive than
magnesium chloride.
Oil Field Brine: Water produced from an oil well in Dunn
County. This product was free, except for the delivery and
application costs, and consisted of about 20% salt – primarily
sodium chloride. This product did provide dust control
similar to the other chloride products.
Crude Oil: Unprocessed crude oil with a pour point of about
70 degrees. This product did not provide significant dust
control.
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Native Clay: This material was used to increase the
Plasticity Index (PI) of the McKenzie County aggregate.
This material improved the overall road stability and
improved dust control, especially when treated with
magnesium chloride. The McKenzie County aggregate
did not have any PI while the Dunn County aggregate
had a good PI.
Past County experience with the chlorides indicates that
several applications may be needed initially to provide
satisfactory dust control. Application frequency can be
reduced after three to four applications.
Under the traffic conditions in western North Dakota,
any dust control product must penetrate the road
surface or be mixed into the road.
SD & WY Experience
ADT exceeds
1000 on
Spearfish
end in
summer.
•Eight inches of gravel originally placed after
aggressive reshape in 1989.
•Liquid MgCl2 treatment applied annually
thereafter.
•Four inches of gravel replaced after 12 years.
Laramie Street
Laramie Street
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Stabilization program began nearly 20 yrs ago.
Initial treatment rate is .5 gal per sq yd of liquid
MgCl² applied after prewetting surface.
Annual retreatment is .3 gal generally applied in
early June and a light shot of .1 gal in mid-Sept.
The product is diluted 1:1 with water to get better
penetration into the surface.
Keys are getting right gravel in place and doing
good preparation, especially loosening surface
prior to retreatment and getting uniform crown.
Summary of comments provided to Ken Skorseth from Harold
Colby, Street Division Manager, Laramie Public Works Dept.
Meade County, SD
2011 Project
No blade maintenance was
done between construction
in summer of 2011 and
surface retreatment in
summer of 2012!
Phone call from citizen – “If you had
enough money to pave this road, why
didn’t you save enough to put striping
on it”
You have just seen a glimpse into the future in
managing a relatively high volume local road
carrying significant truck traffic without the
funds to construct thick base and pavement.
Ken Skorseth, SDLTAP
“We call it Poor Man’s Pavement”
Ken McGirr, Meade Co Hwy Supt