I used to swim and fish in that quarry. And at Aero lake (near the airport) which was declared a superfund clean up in the late 80s or early 90s (I am still okay, thanks for asking). So the obvious problem with you plan lays right there. Someday they will find the body, either some kid will fish something up or the Gov. will be cleaning up the toxic pollution and find the guy. Of course, time passes so maybe you'd be alright. BTW you seem to have thought this out, why the hell am I talking to you?