What are ya on about "lovely clean river"?
It's polluted to hell, withl enterococcus bacterium.
In other words, your gonna get enteritis, the running shits, if you so much as get a mouthful of that water in ya.
And you're gonna hammer the concrete down there eh?
I reckon you're gonna do some sort of a sore toe achy bones limpy skippity hop thing ain't ya Skippy?

Don't suck up too much diesel though eh?