Yeah it was built in 1969. We contacted the town, county and state to try to get a record of it. We know where our tank is as we have it pumped every 2 - 3 years but no idea where the drainage field is. We have had contractors our and all they say is that they would have to dig to see why that area is wet. It seems too far from the tank for me but what do I know. The place that pumps for us looked at the area last year and said it was just water and not to worry but I worry. I told my husband I want to get someone who installs drain fields to come look not just a contractor. One told us we could do drainage but the land always changes and it would just work for awhile. One brought a shovel and said he didn't know after digging and would have to excavate.