From US census records;

Sam Zarkos, age 38, born in Greece, living in Boulder, Colorado in 1910 in a forestry or construction camp there. Many other Greek laborers are living in this camp, which is in a National Forest Preserve

Please also look here for more info:

www.lac-bac.ca

www.familysearch.org

I did not find a P, Paul or other Zarkos name which was close to that name for you.

Good luck with your search!