Water Runoff Toxicity from New Concrete

[BB Texas]

Anyone know what the effects are to plants (grass & young trees/shrubs) with regard to water running off of new concrete?
The water appears amber/green and is very "slimy" to the touch which means the pH is on the base side (probably 2 - 3 if I guessed). It is highly irritating to the skin.

Have approx 1000 sq ft of concrete pool patio that collects in the middle and runs off to one end into my grass right near a new tree.
The earth worms hate it and make a mad dash away from the area.

Any info is helpful, thanks!

 

[JohnT]

Low pH is acidic, but you are correct that concrete is basic. 12 or 13 if my memory serves me. Any effect is going to be very temporary.

 

[BB Texas]

My bad (basic is on the high end, thanks for the correction) http://en.wikipedia.org/wiki/Ph_scale

I would not expect to see this once the concrete has cured. Furthermore, it will get a Kooldeck coating anyway.
Nevertheless, I am just concerned during construction phase.