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form a salty crust    It this crust remains unbroken it can be

effective in reducing dust.   Since we ESfl expect relative

humidity of near zero in all but coastal regions and some traffic

is expected in virtually every area   brine solutions are not

recommended

Cement and Lime   Cement and lime hydrate in the presence of water

and farm a soil-cement mass which will reduce dust.   This

technique is sensitive to the amount and quality of water used.

In an arid climate getting enough potable water into the soil

mass and mixing it sufficiently is difficult    In more tropical

climates water present in the soil will make up for insufficient

added water.   In the desert the cement/lime will remain anhydrous

and may even add to the dust problem,

~.~iiHe Oil/W~~t~ fl~1   While the manuals list applications of crude

or waste oil as a temporary dust palliative these products should

be used as a last resort.      Unlike graded asphalt or tar cutbacks

oil does not cure and adds no structural strength to the soil.

Since it remains liquid it tends to turn loose soil     into a black

oozinq mess which coats vehicles, equipment and personnel.

4dditionally~  the presence of oil    in a soil makes subsequent use

of bituminous products less effective.      We must also be sensitive

to the environmental concerns of the host nation.      While graded

bituminous products cure to form a stable type of soil asphalt

concrete,  crude oil and waste oil    remain liquid and thus ~re

potential  pollutants.

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