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How to read a site plan Set Back  
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The first thing is to locate the boundaries of your lot. This is done by a surveyor. The surveyor uses a registered benchmark to locate a corner of your lot and uses it for a reference for all of the dimensions for your lot. Groundspeak - Benchmark Hunting Home Page

Once the reference point is established, the lot lines can be drawn. The first dimension and angle from our reference above is 100.00 feet north 34 degrees 56 minutes and 00 seconds towards the east. This means looking north from zero, you are reading your degrees to the right for one hundred feet. From that point, the next numbers, 70.00 feet south 55 degrees 4 minutes and 00 seconds to the east. This means looking south from zero, not 180 degrees, but re-setting your transit to zero facing south, you go 70.00 feet at 55 degrees 4 minutes to your left. Degrees, Minutes, Seconds

Now find your utility locations to your lot line and locate them with symbols on your site plan. These can be located for you by calling Arizona Blue Stake (800) stake-it. Arizona Blue Stake, Call Before You Dig

Locate your existing vegetation (trees and shrubs) and mark them on your lot for future reference when positioning the house, you may want to avoid putting that big oak in your living room.

Time to put in the setbacks, these are the boundaries that the local building departments want you keep your buildings within. There are minimum distances that you must keep from your lot lines with all permanent structures. In some cases, this may limit the size and shape of your buildings including the overhangs (eaves) of the roof. Once you have established your setbacks and obstacles, you can see if your building fits on the remaining lot or design one that does fit.

 
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