quadraginta
Becoming Beth
Well then, is it oil build up on roads or is it oil from the asphalt? Because first you said asphalt, being petroleum, would seep oil. Now is it the cars, or does asphalt produce it's own oil and "build up" in dry spells?
Your right, you didn't actually say it. But when you jumped in the conversation between me and rwguinn, sounded like you were defending his position, which was asphalt comes from petro and can leak oil on the road by itself.
I agree it could be oil from cars. It's not something I would suspect be a problem in a small city, with less traffic and all. Maybe used oil being disposed of improperly. One thing is for certain, if it was oil rain we will see it again.
It depends on circumstances. It could be either, or even both.
Freshly installed asphalt has a high oil content. It's very nearly gooey. This is why, even when laid as a pre-mix from a batch plant there is some "curing" time required. Traditional application, still seen in many rural areas, involved spreading successive layers of pea gravel on a road surface and binding them by spraying on an oily tar. As the asphalt weathers over time it becomes drier. When it rains it gets flushed off. Ultimately it will quit exuding any significant amount.
Simultaneously, but entirely unrelated, leaking fluids from motor vehicles can and will build up on road surfaces (asphalt or concrete) until it is disturbed by weather. It may not be obvious on the road surface, in the sense of seeing spills, but it is there and it does accumulate. It is most significant when there have been extended dry spells punctuated by heavy rain. The phenomenon is quite familiar to any insurance actuary, and justly feared by any experienced motorcycle owner.
If you really want to find out how oily your rain is then put up a rain gauge or some other collector, and check that.
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