The field would most likely consume your entire front yard.
My neighbor had his entire front yard torn up to about 3 ft in depth, several tons of gravel, lots of 4 or 6" PVC pipe, etc etc. Took 3 guys about a week to complete the project with dozzers, back-hoe's etc etc. The going rate in MI is about 10k depending on the size of the field obviously, this field was about 200' x 60'
I have one 1500 gal tank, 4 person household, lasts roughly 2.5 - 3 years, costs about 200.00 to clean it out.
Go read the wiki
http://en.wikipedia.org/wiki/Septic_system


