Q: What to do if it begins to rain during work and what do we do with the water on plastic?

Before beginning the renovation, the firm must isolate the work area so that no dust or debris (including in the wastewater) leaves the work area while the renovation is being performed.  In...

Before beginning the renovation, the firm must isolate the work area so that no dust or debris (including in the wastewater) leaves the work area while the renovation is being performed.  In addition, the firm must maintain the integrity of the containment by ensuring that any plastic or other impermeable materials are not torn or displaced and taking any other steps necessary to ensure that no dust or debris, including water, leaves the work area while the renovation is being performed.   

Some recommended options to prevent contaminated water from leaving the worksite to include: 

Stop work and clean up the worksite before the rain begins.  Proceed with interior work only.   Cover the area with a tarp to deflect the rainwater away from the worksite.   Collect the water and dispose of it.  Check with your local water treatment authority for local requirements for handling and disposing of wastewater.