Thanks for the common sense.
I didn't mean to direct that at you, but the builder and the plumber as he/she/it/mutant should have pointed out no drainage was provided in the original plans. Sorry...
At this point my folks have decided to cut their losses and handle this themselves. What would be the best way to install proper drainage for the water softener. I am thinking a standpipe box, no trap, and a run of 2" to get it beyond the house so about 50' of pipe would get it to the side yard. (She absolutely doesn't want it near the house and exit point from the house is inside corner between 4 car garage and main house)
Then what to do in the side yard? I figure then she just needs a resevior to hold brine/backwwash pending soil absorption. Gravel pit? Manufactured drywell? Longer, linear french drain with perf pipe and gravel or peanuts? 55 gl drum with drilled holes? Manufactured septic chamber like ADS or infiltrator?
Have you had a bid on just installing a waste line back to the house or septic tank? I wouldn't use those guys.
You have to consult local code as to a possible French Drain or catch basin. I know it is frowned upon around here.