California Chip Seal Association
http://www.chipseal.org/
International Slurry Surfacing Association
http://www.slurry.org/
California Department of Transportation (CALTRANS)
http://www.dot.ca.gov/
CALTRANS Earth
http://earth.dot.ca.gov/
Contractors State License Board License Check
https://www2.cslb.ca.gov/