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Dust Suppression Alternatives for Municipal Roads in Nunavut
September 2009
Prepared by the Department of Community and Government Service
Wrthmajor assistance from the Intergovernmental Committee on Urban and Regional Research (ICURR)
The Kivalliq Mayors passed a resolution at their February 2009 regional meeting requesting CGS investigate alternatives to calcium chloride for dust suppression on municipal roads.
Product Research
CGS tasked the Intergovernmental Committee on Urban and Regional Research (ICURR) to research alternative products as well as the cost for these· products to what was available and how ;t would compare on a cost basis with calcium chloride.
The attached document details products that are available for use.
It was noted at the beginning of the research project that the Nunavu
Department of Environment has only approved 3 dust suppressants for use in the territory. Those products are Calcium Chloride, Bunker C Oil and DL10.
On an application basis all the products researched would require a dedicated tanker truck with spray bar to treat roads.
The cost to treat a kilometre of road with any of the products researched is considerably more expensive than treatment with calcium chloride. Costs ranged from $4000 to $32,480.00 per kilometre depending on the product before freight. These costs do not factor in capitalization of a tanker applicator vehicle.
Calcium Chloride at a before freight cost of $1590.00 per kilometre is 2 ½ times less expensive to purchase than the cheapest alternative product researched. On a cost analysis basis, calcium chloride continues to be the best value for the dollar.
Calcium Chloride
Calcium chloride appears to be considered by some to be ineffective at controlling dust on gravel roads. Calcium Chloride is still one of the most heavily used dust control products world wide in municipal and industrial applications.
When applied properly it is not only effective but is. extremely cost efficient.
Calcium Chloride is a hydroscopic compound which means it attracts moisture and in doing so keeps roadways damp to suppress dust. In order for calcium to be effective it must be buried in flake form into the roadway 3 to 6 inches belOIN the surface. It can then draw moisture from rain, fog or watering to keep dust down.
During a number of community visits when calcium chloride treatment was underway staff from CGS has noted that the product was being improperly applied to municipal roads and as a result the effectiveness of the product is greatly diminished. In most cases the product was spread on top of the road
surface and then watered which left it prone to being washed away into dra inage
ditches. In one community it was dissolved in a tank of water before being applied to the road which essentially prepared the bulk of the product to runoff into the ditches.
Conclusion
Calcium Chloride is an effective dust suppressant that is cost effective to purchase and apply to road surfaces for Nunavut Communities . It is one of only 3 approved suppressants that can be used in Nunavut at this time and it is
affordable for communities facing tight budgets. Continued use of calcium chloride is feasible if proper application training is conducted for municipal employees.
Recommendation
The department of Community and Government Services should conduct training for municipal employees for calcium chloride application on munici al roads prior to the summer 2010 season.
Table of Contents
Table of Contents ……………………………………………………………………………………………………. ,……………….. 2
overview ……………………………, ………………………………………………………………………………………………………….., ……………….111••· 3 Mandate……… … ………. …. ……….. ,…………………………………………………………………. 3
Background…………………………………………………………………………………………………. 3
Product Descriptions……………………………………………………………………………………….. 4
Product Application ….• 9……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….. 6
Product Shipping and Cost……………………………………………………………………………….. 7
Contacts …………………………………………………..,,………………………………..4 ………………………………………………………………………………… 9
References ………..,………………………………………………………..,……•.•….•••.•·····••111 •4 ………… 10
Intergovernmental Committee on Urban and Regional Research (!CURR) 2
Comite intergouvernementaf de recherches urbaines et regionales (GRUR)
Overview
Mundate
One outcome of the February 2009 Regional Mayors Forum in Nunavut was a petition to the territory’s Ministry of Community and Government Services to investigat altem at ives to the use of calcium chloride for dust control on municipal roads.
The Ministry contacted ICURR to conduct a preliminary survey of alt er atl ve products,
paying particular attention to:
The Ministry also informed ICURR that Tembind, a lignin-based product, had already been investigated locally and need not be considered In this survey. !CURR was directed to restrict this survey to 6-8 different products.
Background
To place the options for c.onsideration in c.ontext, it is important to consider the key benefits for dust control or suppression:
The decision on which dust control process is to be used must consider several important questions:
Before even embariclng upon a dust suppression strategy, the road authority should determine If other elements of road performance have been Incorporated Into the assessment. Road design and construction, including crowns, shoulders and drainage should be examined. Are appropriate surface materials being used? Have reduced speed limits been considered? Is paving an option?
Intergovemment.al Committee on Urban and Regional Research (!C URR) 3
Comiteintergouvemementalderecherches urbalnes et regionales,(CIRUR)
Product Descripttons
The categories of products for dust suppression include:
Since the chlorides currently In use In Nunavut have been determined to be undesirable, and a llgnan product has already been tested, ICURR did not include any products based on these compounds in this survey. Bunker C oil was to be considered but has been omitt ed from this report due to its negative environmental impacts (Yukon) and the fact that changes to pet roleum refining processes have rendered the product scarce and relatively expensive ( interv iew with Frank Hall, OGRA).
In most cases, any dust suppressant will be affected to a certain extent by the conditions in which it is being applied and under which it is expected to perfom,. The local soil (percentage of sand, glacial till, clay etc), the drainage conditions, the application process and the application rates all play into the product’s perfomi ance . Simila r1y , traffic type and density need to be taken into account. The number of vehicles per day and the type of vehicles (percentage which are automobiles, light- duty trucks, heavy equipment, ATVs etc) will both need to be assessed against product features in order to determine the best choice for the particular situation .
Given that most product testing has been conducted in southern Canada and the United States, product selection for use in far northern locales should probably be preceded by testing under local conditions and on tundra soils. It is important to stress that the manufacturer’s recommended application rates need to be followed to guarantee results.
There are many companies In North America selllng dust suppressant products for roads and this report does not attempt to be comprehensive or recommend one product over another. For the purposes of this research, a sampling of seven {7) companies and eleven (9} products was m ad e. The sampling attempts to provide an array of altem ative products representing different product categories and including both Canadian and American suppliers capable of delivering ln the volumes required.
Intergovernmental Committee on Urban and Regional Research (! CURR) 4
Comlt intergouvememental de recherches urtJaines et ionales (CIRUR)
Table 1. Selected non-chloride, non-llgnan dust suppressants
*MSDS sheets or equivalent data is available from most suppliers on their web sites
Intergovernmental Committee on Urban and Regional Research (!CURR) S
Comite intergouvememental de recherches urbalnes et regiona/es (CIRUR)
Product Application
Application of dust suppressant products can be either topical or worked into the surface via grading or scarification. Some products are applied as supplied and others require additional handling (e.g. mixing, pumping, heating, compacting etc). Products come in a variety of forms including liquids, emulsions, powders etc. Curing times are often dependent upon climate conditions at the time of application and can also vary significantly from product to product. The duralnillty of dust suppressants depends upon the type of product used, its application, the amount of rainfall, the temperature and the amount of traffic. Some product durability is enhanced with each subsequent application.
Table 2. Application
*MSDS Sheets or equivalent data is available from most suppliers on their web sites
Intergovernmental Committee on Urban and Regional Research (!CURR) 6
Comite intergouvemementa/ de recherches urbaines et regionales (QRUR)
TPD0909039
Product Shipping and Cost
Obviously, in shipping these products any great distance, the shipping co ..s can be the single largest expense. Product pr1dng in almost all cases will vary depending upon the quantities ordered, and shipping costs will vary based on the weights of the product and the distances to be shipped.
The products are generally available In bags (SO to 55 pounds) or totes if they are in powdered formats and 450 pound drums or 2000 plus pound totes if they are liquid. Bulk shipments are available for most products will result in better pricing for both product and shipping costs.
Most product manufacturers indicate that surface condition is a factor in product efficiency and surface preparation costs will only be known on a case by case basis. This can range from no surface preparation r’equi red to extensive gradIng, searlflcation and dralnage work. Clearly, the more preparation required prior to application will have an impact on cost.
Application rates vary from product to product. Even with the same product, suppliers often specify a range of application rates depending upon road and climate conditions.
Application equipment costs in many cases will be no greater than current costs where typical water trucks with sprayer attachments are used. However, in some cases, products will necessitate the addition of agitators or pumps which will need to be factored in to cost estimates.
The durabillty of the product is another factor to be considered when evaluating cost. Durability claims vary widely from product to product and those claims will need to be evaluated on a case by case basis. Some products would need multiple applications per season while others claim to need only one. Most products must be reapplied after reworking the surface for maintenance but at least one claims to continue to be effecttve after reworking. Alter the initial application, some pr-oducts are applied at the same rate for all subsequent appllcatlons while others can be applled at significantly reduced rates on subsequent applications (as ltttle as 30% of the 1st appllcatlon). All of these elements can have a dramatic effect on the cost.
In comparing costs, the relative environmental Impacts, while difficult to quantify, should be factored in. Also, when compared to chloride based products, all of the products surveyed for this report do not have the corrosive qualltles on machines and equipment normally associated with chlorides.
Finally, product handling and storage ts different from product to product. Emulsions require careful handling and cleanIng of equipment, some products work best when applied in warm weather and others daim to be easily applied in below freezing weather. is may result in incremental costs or savings for the road authority.
The cost estimates in the table that follows are based on application rates that are either the recommended rate or the highest rate for maximum results and durability. Lower rates might be appropnate In certain cases. Toe costs are also based on pricing provided for non bulk orders.
Interyovemmenta/ Committee on Urban and Regional Research (!CURR) 7
O,mfte intergouvememental de recherches urbalnes et regionales (CIRUR}
Table 3. Product shipping options and cost
*All costs are exdusive of shipping and application. Materia l cost per km ls based on an 8 metre application width (8000m2 ) one application only.
Intergovernmental Comm;ttee on Urban and Regional Research (/CURR) 8
Comfte lntergouvememental de recherches urbaines et reg/onales (CIRUR)
Contacts
Cypher Environmental Ltd
391 campbell st
Winnipeg, Manitoba R3N 1B6 Norm Bums, 204-489-1214
http://www cvoherenv,ronmental,com/
Petro Canada
P.O. Box 2844
150 – 6th Avenue S.W.
calgary, Alberta TIP 3E3
Corinne Cory, 1-866-355-3369, 403-296-8000
http://www.petro canada.ca/default.aspx
MIiiigan Bio-Tech Inc
Box 130, 907 Highway 16E
Foam Lake, Saskatchewan S0A lAO
Rob McGregor, 306-272-6284, 1-866-388-6284
www.mllliganblotech com/
Enssolutlons Ltd
450 Sherman Avenue North Hamilton, Ontario LBL 8J6
Phil Moruzi, 905-312-8422, 1-866-306-2489
Hydrograa Technologies
157 Southbridge Road,
North Oxford, Massacheussetts, 01537
Paul Nigoslan, 508-726-7695, 1-800-853-5393
http://www.hydroqrasstech.com/
SynTech
520 East Woodruff, Toledo Ohio 43604
Ted Leslie, 1-800-537-0288
http://www.syntechproducts.com/
Rock Solid Solutions
Box 1800, Nanton, Alberta TOL lR.O
Jeff Sears, 1-888-646-0180, 403-312-1174 (cell)
http://rocksolidsolutlonsjnc.com/
http; //durasou.com/
Intergovemmental Committee on Urban and Regional Research (!CURR) 9
Comlte fntergouvememental de rechert:.hes urbaines et regiona/es (CIRUR)
References
Dust control for Unpaved Roads, National Guide to Sustainable Municipal Infrastructure
(lnfraGuide), October 2005
Dust Palliative Application and Selection Gulde, Bolander et al, U.S. Department of
Agriculture, 1999
http://www-rcy.wa.gov/programs/a1r/pdfs/Dust Palliat1ve.pdf
Potential Environmental Impacts of Dust Suppressants: Avoiding Another Times Beach, An
Expert Panel Summary Las Vegas, Nevada May 30-31, 2002, U.S. Environmental
Protection Agiency 2004, Piechota et al.
http.//www.epa.gov/esd/cmb/pdf/dust.pdf
Testing of Dust Suppressants for Water Qua/lty Impacts, Karen Irwin et al, U.S.
Environmental Protection Agency, 2008.
h v r i no air D f
Alaska Rural Dust ontrol Alternatives, (DRAFT), Sierra Research for the Alaska Department
of Environmental Conservation, 2006
b .,o. //www. f pa .goy/reg1on09/air/dust/Dustsuooressants-seot2ooa, odf
Dust Suppressants, Environment Yukon, Government of Yukon. Retrieved on March 3, 2009
from http://environmentyukon.gov.yk.ca/monitoringenvironment/EnvironmentActandRegulations/distsuppres.php
Telephone interviel s with each company contact, February 25 to March 6, 2009
Telephone interview with Frank Hall, Ontario Good Roads Association (OGRA), March 2,
2009.
Intergovernmental Committee on Urban and Regional Research (/CURR) 10
Comite intergouvememental de recherches urbaines et reglonc1les (CTRUR)
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Copyright Soilworks, LLC 2003-. All Rights Reserved. Soilworks®, Soiltac®, Gorilla-Snot®, and Durasoil® are registered trademarks of Soilworks, LCC.