</font><font color="blue" class="small">( While my septic tank is outside the pasture, and away from anything heavier than my riding lawnmower, the drain field is in the front pasture, and i regularly mow over it with my NH 1920 or my 8n.. the 1920 is 3300 plus about 500 for the mower. I've got cacl in the rears on the 1920.. so add a couple hundered too.
I've never had a problem yet.
Soundguy )</font>
Couple hundred! Must be some TINY tires!