Deliver the report to Senior Surveyor Fizzledowser in Gadgetzan. Be sure he gives you a copy of the report, as Alchemist Pestlezugg has requested.
Senior Surveyor Fizzledowser needs to see this report immediately. Actually... everyone who can read needs to see this report. We are facing a grave and serious threat to not only Tanaris and Gadgetzan, but if left unchecked, the entirety of southern Kalimdor. Heck, even quite possible the whole of Azeroth; this thing has given no indication it will subside.
Have Fizzledowser make a duplicate of the report for you to distribute freely to your allegiance. Everyone must know about this threat!