Construction and demolition work puts fine particles into the air, and those particles do not stay inside the property line. Wind carries them onto nearby lots, roads, and sidewalks. That creates a health problem for your crew and a liability problem for you. Coastal Georgia makes this challenge even harder. Sandy soils are among the easiest for wind to pick up, because the grains do not bind to each other the way clay does, and sea breezes and storm fronts along the coast can whip and carry dust from your jobsite.
Construction site dust control is the contractor's responsibility. In this article, we cover best practices for reducing and suppressing it.
Jobsite dust is rarely just soil. Cutting, grinding, drilling, and demolition release silica dust from concrete, brick, block, and stone. Work on older buildings can also release asbestos fibers and lead particles. Add pollen, mold spores, and bacteria from disturbed ground, and your crew is breathing a mix of material it should not be breathing all day.
Dust that leaves the site is a separate problem. Neighbors have grounds to complain when material settles on their vehicles, air intakes, awnings, and siding. Near Savannah's historic districts, the Richmond Hill corridor, and the barrier island resorts, expect that complaint to arrive faster than it would on a rural job. Maintain written records of the dust control measures you ran and when. That log is what you fall back on if a complaint turns into a claim.
You cannot enclose an open site, but a barrier along the property line cuts down what blows off it. Barriers are also the one dust control measure that keeps working overnight and on weekends, when no one is there to run a water truck.
We recommend using porous fabric rather than solid panels. A solid wall stops wind at the face, but the air spills over the top and drops sharply on the far side, carrying dust down with it. Windscreen fabric lets some air pass through, which slows the wind without creating that downdraft. Barriers work in two directions. Set upwind, they slow the air before it reaches exposed soil. Set downwind, they catch particles already moving.
Water is the most direct control you have. Wet particles stick to each other and to the ground instead of lifting into the air. Misting cannons, water trucks, and fixed spray systems are the standard dust suppression tools, and all do the same job at different scales.
Always cover the whole area rather than soaking part of it. Haul roads and equipment travel lanes throw more dust than the rest of the site, so include them on every pass. Automated systems that run on a timer, or trip when dust sensors read high, keep coverage steady without tying up a crew member.
Timing can also be more of a challenge when working near the coast. Afternoon sun dries exposed ground fast even on humid days, so one morning pass will usually not hold a site until quitting time. But going too far the other way causes its own trouble. Where the water table is high, over watering leaves standing water, tracks mud onto the road, and pushes sediment toward tidal creeks and marsh buffers.
Calcium chloride and similar chloride products have been used for dust control for decades. They pull moisture out of the air and hold it in the road surface, so a treated haul road stays damp longer and needs fewer water truck passes. Humid coastal air gives these products plenty of moisture to draw on.
Two cautions apply. First, chlorides speed up corrosion, and equipment working in salt air is already fighting corrosion. Wash undercarriages, frames, pins, and electrical connections on machines that run over treated surfaces. Second, chlorides dissolve in water and wash out in heavy rain. If your site drains toward marsh or tidal creek, check the product against your permit conditions before you apply it. Non-chloride options are available, including tree resin products and polymer binders.
Covered storage is a low cost dust control step that does not need daily attention. Sand, aggregate, and cement give off dust during delivery, handling, and storage. Tarps, plastic sheeting, three sided bins, and enclosed silos all cut that down. Where the layout allows, place stockpiles away from site boundaries and out of the main wind path.
Covering piles also protects material you have already paid for. Product that blows off a stockpile has to be replaced.
The faster trucks and equipment move on dirt, the more dust they raise. Posting and enforcing a speed limit is one of the cheapest dust suppression measures you can implement. If your operators lower their speed even just from 45 MPH to 35 MPH, it can reduce dust generation by up to 22%.
Post the limit at the entrance and along the haul route. Speed bumps and narrowed lanes hold speeds down better than signs alone.
Material that piles up on hard surfaces lifts again every time a machine drives over it. Regular cleanup keeps that from building. Housekeeping is easy to defer, but letting it slide undoes the rest of your dust suppression work.
How you clean matters. OSHA's silica rule restricts dry sweeping and compressed air where those methods expose workers to silica, unless nothing safer will work. Wet sweeping, vacuums with HEPA filters, and washdowns are the approved methods. Add a wheel wash at the exit as well. Material tracked onto public roads gets ground into fine dust by traffic and blows through the surrounding neighborhood.
Georgia Rule 391-3-1-.02(2)(n) covers fugitive dust statewide, meaning any dust that escapes without passing through a stack or vent. It requires reasonable precautions to keep dust from going airborne, and it limits how heavy the visible dust can be, capping it below 20% opacity. The dust precautions it names include using water or chemicals during demolition, construction, road grading, and land clearing, and treating dirt roads, materials, and stockpiles.
Construction site dust control in Georgia starts with the state rule. Local requirements stack on top of it. Land disturbance permits and city ordinances in different counties may add conditions of their own, especially near neighborhoods, schools, and historic districts. Check those during permitting, not after someone files a complaint.
Construction site dust control depends partly on the machines moving the material. Water trucks, compact loaders, and the right attachments for your ground conditions all factor in. Our team can walk you through construction site dust control options and help you match equipment to the job.
Contact us in Richmond Hill to talk through a project in coastal Georgia or the Low Country.
Contact UsWhat is the most effective dust control method on a construction site?
Water, on most sites. It covers the most ground for the least money and works on nearly any surface. Sites with heavy truck traffic usually get better results by adding a chemical suppressant on the travel lanes, since a treated surface holds moisture between passes.
Does OSHA require dust control on construction sites?
Yes, wherever the work releases silica dust, which covers most concrete and masonry work. For those tasks OSHA generally specifies one of two controls: water fed to the blade or bit, or a vacuum that captures dust at the source.
How often should you water a construction site?
There is no fixed schedule. It depends on soil moisture, recent rain, wind, and how much traffic the site is carrying. On coastal Georgia sites in summer, exposed ground can dry within a few hours, so several passes a day is normal. Watch the surface, and keep a log of what you applied and when.
Can you use calcium chloride near coastal wetlands?
Sometimes, but check first. Your land disturbance permit and any buffer conditions will say whether chlorides are allowed on a site that drains into a marsh or creek. Where they are not, tree resin and polymer products are the usual substitutes.
