Bacteria also will not be so ...

Published February 14, 2017 06:14 by Piotr Grzybowski, Ph.D. at Warsaw University of Technology

Bacteria also will not be so active in the snow.

1) collect oil and snow and separate in a small separation unit after snow melted, or

2) apply porous hydrophobic silica grains (like aerogel, silicagel) , they absorb only hydricarbons, collect them later

Sorry I do not know details but you find more in the Internet.