At workplaces where arriving workers gather in one place, such as manufacturing and construction sites or vehicle entrances, alcohol checks that confirm whether people have been drinking before they start work are sometimes run outdoors. The breath alcohol testing equipment, the waiting line, and the entry approval procedure all come together in one spot. But when it rains, the ground becomes slippery, people holding umbrellas and people carrying tools crowd the narrow passage, and vehicle routes can come closer as well.
The goal of rainy-day operation is not simply to shield the equipment from the rain. It is to let people coming for a check move safely, keep the equipment within its confirmed operating environment, and make sure no one due for a check is missed while the location changes. So rather than rushing to find a tent at the site, it is better to set the alternative location, the decision to switch, and the guidance and recording methods in advance as a single procedure.
When it rains, look at the equipment and the flow of people together
The rain risks at an outdoor check station affect equipment and people at the same time. Rainwater and moisture can reach the equipment, and the condition around power connections also needs checking. For people, wet ground, a shrinking waiting area, and walking routes that overlap with vehicle entrances can be more direct risks.
So it is best not to decide whether to keep operating at the existing location based only on "will the equipment get wet?" Also check whether people waiting move to the edge of the roadway to avoid the rain, whether the entry gate and the check line block each other, and whether emergency routes stay open. Situations where people with umbrellas and workers wearing hard hats and carrying tools pass through the same passage are hard to manage with the usual floor markings alone.
Equipment water resistance, usable temperature and humidity, and whether outdoor use is allowed differ by model. The fact that the equipment is set up under a tent does not mean the equipment and power connections are safe. Whether operation can continue at the current location must be judged based on the equipment manual and the conditions of use confirmed by the manufacturer or supplier.
Choose the alternative location as a check route, not just shelter from rain
Choose an alternative location, indoors or under a roof, that arriving workers can easily find from their existing route. However, an empty space near the entrance is not suitable just because it is there. You also need to confirm that the waiting line will not intrude on walkways, vehicle lanes, or emergency routes, and that the power and communication setup the equipment needs is available.
| What to look at | What to see at the site | Decisions to make in advance |
|---|---|---|
| Movement of people | Wet ground, where vehicles and pedestrians cross, space for the waiting line | Where the line will form and a route that avoids vehicle lanes |
| Equipment and power | Possible exposure to rain and moisture, power connections, confirmed operating environment | Whether to stay at the existing location or move to the alternative |
| Check procedure | Signs, intake records, consumables, staff assignment | Who issues guidance and who starts intake at the new location |
| Entry flow | How entry approval after the check connects to the movement route | The entry route people take after finishing the check |
The items in the table are meant to prevent a situation in which only the location changes and the check procedure stops. For example, even if the equipment is moved, if the intake records, consumables, or the person giving directions at the new location are left behind, arriving workers will find it hard to know where to be checked. Dividing roles so that the facility or site manager checks the location and movement, and the equipment manager checks the equipment environment, also makes the basis for decisions clear.
Decide who makes the switch based on which facts
A sentence like "move when it rains" is hard to put into practice at the site. You need to decide who looks at the ground and passage conditions when rain starts, who confirms the equipment's conditions of use, and who decides on the move. Rather than setting rainfall or humidity figures the manufacturer has not confirmed as arbitrary equipment operating limits, it is better to design the procedure so that actual weather, the safety of the installation site, and confirmed equipment conditions are all considered together.
Take a hypothetical case. Suppose the rain gets heavier during the morning arrival period, the waiting line at the outdoor check station at the main gate stretches out beyond the eaves, and some people with umbrellas step aside onto the edge of the vehicle entrance. What to observe here is not just the length of the line. Check the wet walking areas, the points where vehicles and people meet, moisture exposure around the equipment and power, and how many people have not yet been checked.
This situation can be read as a sign that keeping the line at the existing location may cause the check operation to create new movement risks. A possible action is to move to the designated alternative location, direct people starting from the end of the existing line to the new location, and remove or cover the signs at the old location. If some people have already completed intake, the staff should tell them clearly where they will finish the check. Set the completion criterion as confirming that the guidance, intake, and check flow has started at the new location, and that no one waiting or not yet checked remains at the old location.
A separate procedure is also needed for returning to the original location after the rain stops. Look at the ground, passages, and equipment surroundings again before deciding whether to return. If you go back as soon as the rain stops, directions may get crossed again or the same risks may recur on wet ground.
On days the location changes, record whether anyone due for a check was missed
Operating records on rainy days are not for collecting more individual test results. They are records for confirming that the check procedure was not interrupted by the change of location. Recording the time of the switch, the location actually used, who decided on the switch, who handled directions, and how the people still waiting at the time of the move were handled lets you check for omissions when the same shift's checks are split between two locations.
If the switch happens at a shift change, rather than vaguely writing "handed over," the outgoing staff member needs to tell the next person specifically who is currently waiting and who has already been checked. The new staff member can then confirm that intake and checks are continuing normally at the alternative location and that no one at the old location missed the directions.
Site photos can also be used to confirm whether the equipment is suitable. It is best for photos to show scenes needed for the judgment, such as wet ground, the structure of the roof or tent, and the environment around the power supply, and not to include people's faces or screens showing individual test results. When asking the supplier, you also need to give the installation conditions, such as the type of outdoor exposure, the expected hours of use, and the power configuration, so they can confirm whether the equipment can be used in that environment.
Reflect rainy conditions in risk assessment and operating procedures
Article 36 of Korea's Occupational Safety and Health Act requires employers to identify hazards and risk factors arising from work, determine the size of the risks, and establish and implement improvement measures to reduce them. At an outdoor alcohol check station, wet ground, crossing points between vehicles and pedestrians, temporary power and equipment exposure, and missed checks that can occur during a move can all be examined as site conditions.
Based on the review, you can prepare an alternative location, change the waiting line and movement routes, and build the switch decision and role assignments into the operating procedure. The key is not to leave site staff to decide everything from scratch every rainy day. If you define the normal location and the alternative, the conditions for starting a move, and even how to confirm after a move that everyone due for a check was handled, you can manage both the checks and arrival routes on rainy days.
