posted 5 years ago
I would get the dumpster. You're right about the soil. Get rid of them, whatever else you do.
To remediate the area, I would get someone to drop a bunch of woodchips where the shingles used to be. I would treat these woodchips regularly with actively aerated compost extract and fungal slurry, probably oyster mushrooms, and I would top up with woodchips as they turn into soil. I wouldn't eat any of the mushrooms, as they will be absorbing contaminants as well as breaking them down in some cases.
After soil is clearly visible in the wood chip mix, I would probably sow in something like a Russian Mammoth sunflower, that generates serious biomass and has a taste for heavy metal contamination. Depending on where you live, there may be better options. Most are fibre-producers, but the only one that I remember sequestering at rates high enough to be exceptional was hemp. Sunflower was right up there, though.
It shouldn't be a huge deal unless the shingle pile is uphill from your food production, or unless you want to use the spot to grow food.
To remediate over the long-term, I would honestly just get to the sunflower stage I described, harvesting and sequestering everything that grows regularly (set to dry in the sun somewhere it could be gathered would work) until it could be incinerated, preferably in something as hot as the burn tunnel of an RMH. I would then grow either good-looking soil builders or an attractive patch of thriving woodlot on the site, or grow fibre-crops in succession with an annual soil-building guild.
Old shingles set off the same alarm bells for me as old tires. No thank you.
Good luck, Benedict, and keep us posted.
-CK
A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
-Robert A. Heinlein