Oily Water Turned Soil Gray!!!

Hi everyone,
A few months ago, my car had a major oil leak ( Rear Main Seal ), and when I started it up, oil basically POURED right out in A STREAM, and my car went through one quart of oil in like 5 minutes. There was a HUGE puddle of oil all over the driveway. I used kitty litter to try to soak it all up. and then tried to wash it away with some "Dawn Dish Soap".
Anyway, now everytime it rains, the driveway gets puddles of that "rainbow colored" oily water. When I try to wash it with the "Dawn Dish Soap", the white foamy bubbles from the Dish Soap turn all Black. So the bubbles all turn this foamy Black color, and the water underneath is all rainbow colored.
So the other day, what I noticed after the snow melted on the grassy area next to the driveway, was that there was an area about 3-4 feet long, and about 1 foot wide, where the grass has turned all Black, and the soil is now a GRAY color. The reason for this, is because the asphalt driveway is very old, and not perfectly flat, and so the water and melting snow runs down onto the grass and soil.
So does this mean that the soil is now contaminated with oil? Do I have to dig out all the grey-colored soil, and reseed the whole area? If so, how far down do I need to dig?
Instead of digging all the soil out, can I fix the soil, by just topdressing the gray soil with some compost or organic topsoil, and then reseed?
Because its not like the motor oil was dumped or spilled directly on the grass, but the oily residue in the driveway mixed in with rainwater and melting snow, and turned the grass Black, and the soil a greasy/oily grey color.
Any suggestions would greatly be appreciated!!!
P.S. Is there anyway to DRY OUT the oily residue in the driveway, so that when it rains, the puddles won't have that oily, rainbow color? Will scattering "rock salt" down on the area where the oil spill was, help to dry it out? Because doesn't rock salt dry stuff out?
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snipped-for-privacy@webtv.net (MICHELLE H.) wrote:

Maybe some info in this. Your scale is small so you may have more options.
Soil Rehabilitation Guidebook
<http://www.for.gov.bc.ca/TASB/LEGSREGS/FPC/FPCGUIDE/soilreha/REHABTOC.HT M>
--
Garden in shade zone 5 S Jersey USA



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On Sun, 28 Feb 2010 12:41:14 -0500, snipped-for-privacy@webtv.net (MICHELLE H.) wrote:

Don't use salt or you'll further contaminate the soil and probably further damage your blacktop driveway. It doesn't sound like a major oil spill, one or two quarts is not really a lot. Being where you have a change of seasons, where it freezes, thaws and there is plenty of snow/rain soil will purge itself of contaminents within a couple three seasons... I'd place a good layer of top soil on that small area and reseed... it's probably already too late to remove the top inch or two of soil in that area anyway. As to the blacktop continue with the litter during dry hot weather, sweep it about each day and occasionally remove it and place new... cat litter is a lot cheaper than patching a driveway. If you find your driveway is stained the next year have it surface coated, probably long overdue anyway. It's really not a good idea to allow any motor vehicles to park on blacktop, they all leak some... some a lot... if you need the parking space and have the room you may want to think about adding a crushed stone parking apron adjacent to your black top driveway. It's not so much the discoloration created by an oil spill, but over time those little drips will dissolve the asphalt and create a pothole, unsightly and not inexpensive to properly repair.
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Hi everyone,
Thanks for the responses, I really do appreciate it!! Someone asked me if I "SCRUBBED the dish soap into the oil spot". No, when I used the Dawn dish soap, I DIDN'T scrub it in. I just swept up all of the kitty litter, and then put some Dawn dish soap over the oil spot, when it was raining.
Also, I am not sure if the kitty litter is what turned the soil Grey, because I used a bag of 'Johnny Cat" kitty litter which is White in color.
But I will follow your suggestions and keep putting kitty litter there to try to dry the oil spot up, so that when it rains, there is no more "rainbow colored" water.
Hopefully I can just topdress the lawn with some compost or even organic topsoil, when the weather warms up ( its in the 40's in my area ), and reseed, and hopefully the grass will come back!?
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On Sun, 28 Feb 2010 12:41:14 -0500, snipped-for-privacy@webtv.net (MICHELLE H.) wrote:

The soap may have added to the soil damage, certainly did not help the plants. Replace the area with fresh topsoil (5 or 6 inches is good), seed and protect with straw. Or, wait for the oil/soap to leach out, perhaps several months until you no longer see rainbow-colored oily waters.
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