Not the best time possible but still a really good try.
There basically is just one thing you need to know.. Speed is the most important thing here! =p
As you see you can prevent alot of cops from spawning when you:
A - stay off the bridge after clearing it and planting the saws as fast as possible.
B - get to the top of the scaffolding as fast as possible.
C - get the the boat and then to the extraction point AS FAST AS POSSIBLE!
I think you got it. =p
![](https://s2.save4k.ru/pic/PRSQBzjczXY/maxresdefault.jpg)