I've talked to a neutral septic installer (one who had nothing to do with this installation) and a civil engineer who deals with septic systems, and they both agree--
I've got REALLY terrible soil conditions. The county where we live gives septic permits for everyone, as long as they get their $350. They were surprised to hear that they failed it, because the county rarely fails septic systems. I have really heavy clay, and the water just sits on top. To make matters worse, I also have the low spot in the front yard, just past the leach field.
They said the problems really aren't due to installation issues, but rather the terrible soil and terrain. Since one of the leach fields worked better than the other, both of them recommended that I use the back field during the wetter periods and the front field in the summer and fall.
Fortunately, when it got saturated, it started flowing into the back field instead of working its way to the surface. I have half a functioning septic system, and once it dries up, the front half should be functioning also.
The rain we experienced this past summer was out of the norm, and we hopefully won't have flooding like this again. However, they both said it is important to dry up the flooded area just beyond the front leach field. That water is what is causing the saturation in my front field, since gravity is causing the water to naturally seek the easiest path to flow.
That being said, since the ditch at the road in front of my house is higher than the water level in the front yard, it's difficult to drain the standing water without pumping it. However, the ditch that runs along the road on the other side is about three feet deep (about two feet deeper than the ditch in front of my house). This would be the perfect way to let gravity get rid of my excess water, but somehow I've got to get a pipe under the road without tearing things up or causing a ruckus among government-type officials.
Any ideas?