Uh, this is getting freaky. I use to work for an Electrical Contractor out at the BP Refinery, PowerTek. I retired from the working scene a couple years ago, and haven't looked back. Certainly don't miss climbing the towers.
Your stone's throw would have to be a real toss, since you'd have to get the stone over Chuckanut Mountain. No fair throwing it while you're on I-5, passing through Bellingham.
Back on topic: I still wouldn't trust the wood, no matter what the Orchard owner said. Your nose is your best weapon in telling you, this wood ain't right. Drain fields by definition are varied in their source: Residential, Farm or Commercial/Industrial. They're counting on the soil and amendments to purify the liquid being discharged through the system into a "safe" product. That is a risk I'm not willing to take. I don't know about Skagit County but up here in Whatcom County, they don't like you planting your vegetable gardens in a residential drain field.
Remember the joke we like to use out at the BP Refinery, we don't eat the berries or the deer that populate the Refinery. There's a good reason for it.
I have a friend who owns and builds septic systems here in Whatcom County. I'll bounce your concerns off of him and see what he thinks. He'll want to know what type of drain field it is though: Residential, agricultural (thinking something like a dairy farm or the like) or what......
~Dave
