WARNING: Our facilities have products that contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
Below is additional information to help business owners and consumers understand California Prop 65

California’s Proposition 65 requires businesses to notify consumers that hazardous chemicals may be present in products they buy or places they go.

What is Proposition 65?  
Proposition 65 is a California initiative that was approved by the voters and enacted as law in 1986. It protects Californians from the risks of undisclosed harmful chemicals that may be present in food, consumer goods and business premises. Businesses that post a "safe harbor" warning about the risk of these chemicals can avoid liability for noncompliance with Proposition 65. The safe harbor posting must state: "WARNING: This product contains a chemical known to the State of California to cause birth defects or other reproductive harm." (Regs., tit. 27, § 25603.2, subd. (a)(2).)

For further information, see:
Wikipedia 

In addition to postings at the branches, many SG documents include the following warning -  
Prop 65 Warning: Detectable amounts of chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm are or may be found in these materials. (California Health and Safety Code Section 25249.6).