I'm from California originally and I don't remember seeing this before but in this area the irrigation companies put the valves for each lawn station actually out in the lawn. So if you have multiple stations around the house the valves boxes are scattered all over the yard and with Centipede and St. Augutine a year goes by and they are almost impossible to find. Sometimes it looks like sod is just laid down over the top of the valve boxes because all of my properties have valves that I've never been able to find. The installers aren't providing drawings of the designs to the homeowner either, I've asked. So my problem is that I have some aerations that I want to do but I don't want to run the aerator accross the lawn and break unknown valve boxes. I'm also worried that the wires may be buried unprotected and close to the surface because I've damaged them before an inch or two below the surface while landscaping. Does anyone have suggestions for finding the valve boxes and/or associated wires? I know I can put disclaimers into the contract before I do the work but the last thing I want to do is destroy someones system and then spend however much time to fix it.