Is this negligence?

[1171]

you should contact your union as they can protect individual workers from unfair labor practices.

i'm not sure it will protect your or your job as that is not it's intention but safety violations should be reported to Cal OSHA.

you can investigate your rights under ADA to reasonable accommodation
http://www.ada.gov/

you can file a discrimination complaint on your comp claims if you believe you have been subject to retaliation for filing a claim

see guide 7
http://www.dir.ca.gov/dwc/iwguides.html