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Whatever you do, do not think "it looks like water, and you can't smell gas, so lets throw a match in it and see if it burns"
Ive seen it happen... it'll still burn
As for the disposal of it... If its like 20 gallons or so, Id put some "Heat" in it and let it work.. let it sit in a well ventilated area and let it evaporate, or call your local recyling center.
I agree with the evaporation route. If you are dead certain that no kids can get around it to experiment with, just set it out in the sun in an unopened container, over away from the house, it'll evaporate in no time. I put mine in my oil drain pan, which is about the size of a wash basin. Larger amounts I take to the same place I dump my waste oil.
It is not good to just let it evaporate into the air where it adds to smog and air pollution. Call your city or county to find out if there is a disposal facility around.
Do not contaminate the waste oil center with gasoline or antifreeze. Make sure there are different containers for the different types of waste products.
At our local parts store they take any petroleum based product and dump it into the same barrel.
But, if it has one teaspoon of water in it, it ruins the whole batch, so I dont think they'll take it..
If your going to be burning brush or something of that nature, use it.
Depending on the amount of water in it, Id try to use some product like "heat" and use it...
If the situation is no professional collection available, I would go the evaporation or the burning brush (VERY VERY CAREFULLY) ideas over dumping it out. On a hot sunny day it will evaporate quickly. Just be sure there is no ignition source around.
Call me crazy, but I'd use it. Unless it's REALLY bad.
Run it through a filter to get it as free from debris as you can, even if you do it 2 or 3 times.
Then separate the water. Just let nature take its course. Store it in a cool, dry place for a while, tightly capped. Then simply siphon off the top 1/2 to 3/4 of the container depending on how much water is in it. If you have a glass container (I use an old wine carboy) you can see the gas/water contact.
As long as it's not overly dirty, a little bit of water won't hurt things like an old lawn mower, rototiller, beater car/truck, etc... I do this with all of our old gas after storage etc... and have never had a problem. I even throw in gas mixed with 2 stroke oil.
The old '74 GMC doesn't seem to mind.
You can burn money (and sometimes I swear it evaporates) but why would you?
Thanks for all the ideas! I was planning on the evaporating route, but was worried about the smell. but i'll try it anyway. The recycle center wont take it.
Old gas in as pump sprayer make a dandy weed killer, it nearly sterilyzes the ground around driveways. My highschool used it to mark the perimeter of the football field. Environmentally safe? Likely not but it works.