Our pool finished filling yesterday and we are waiting for the guy to come and do the startup. Today the pergola guys showed up to construct the top of the pergola. Lots of sawdust in the pool. But worse, they just dropped a gas powered chainsaw into the pool along with a cordless drill. I got out there just in time to see them fishing the chainsaw out with a nail on the end of a pressure treated 2x6 (on the newly finished interior). I'm concerned about the gas powered chainsaw in the water as well as the pressure treated lumber in the water. I can see a bit of an oily film on the top of the water...not sure if it is the sawdust or the chainsaw but I'm not sure what to do about the water. Is this a contamination that requires draining the pool and refilling, or is it not that big of a deal? Any advice?