If you smell gas, immediately extinguish all smoking materials and any open flames. In addition, do not operate any lights, telephones, appliances or cell phones as flames or sparks from these devices can trigger an explosion or a fire. If you smell propane that you think might be leaking, you need to immediately leave the area and evacuate the area or building where you suspect that gas might be leaking.
Once you leave the area, you should locate and shut off the main gas supply valve on your propane tank, if it is safe to do so. Once you've exited the area and are a safe distance from the source of the gas smell, you should immediately report the leak from a neighbor's house or other nearby location by calling San Juan Propane immediately. If you can't reach your propane retailer, call 911 or your local fire department immediately.
More than anything, don't re-enter the building until your propane retailer or fire department has determined that it is ok to do so. Finally, you should always have a qualified service technician from your local propane retailer perform a complete propane system check and any of your propane appliances to make sure they are leak-free before you attempt using them.