How to calculate maximum effective radiated power in any direction for Galtronics small cell site
Ok, so considering the PCS stuff first, they are basically saying that on axis in the horizontal plane of the antenna they the EIRP is ~83W, so +19dBW, allow for the ~9dB of antenna gain and the power they are feeding the thing is right around 10W = +10dBW.

In the 5Ghz band they are running 2.5W = +4dBW EIRP, with an antenna gain of ~4.7dB, so they are running a little less then 1W into the thing.  

To calculate power in any given direction you take the gain values from a polar plot in the appropriate axis (The more interesting one is generally the vertical plot) add the value from the polar plot to the input power in dB (Some polar plots are drawn in terms of gain below maximum which you would need to fiddle with a bit), which gives you the effective EIRP in that direction... 

Now you take that number, convert from dBW to watts =(10^(dB/10)) and calculate the power flux density by dividing the power in watts by the area of a sphere at whatever distance you are interested in. Results will be in Watts per square meter (SMALL Number).

My take, it is a flea powered little radio, your personal cell phone produces far more power density where you are then that thing ever will.  

Just for shits and giggles, lets pretend that it was on its side and so aiming that EIRP at the ground 24 feet below, (It isn't these things are designed to be anaemic at high vertical angles), but lets pretend... So 85W EIRP, at 24 feet, area of a sphere of radius 24 feet is 4PiR^2 = ~7200 square feet, 85W/7200ft^2 = 0.012W/Ft^2 = 12mW per square foot on axis, reality will be much lower unless you are directly in line with it 24 feet up. 

Pony little toy radio set, get them to put a proper one in that actually means it.