By Carlos E. CastañedaA worker at a Concord nursing home was arrested and charged with sexually abusing an elderly resident, Attorney General Rob Bonta announced on Friday. The worker, identified as Arian Mojaddidi, worked as a certified nursing assistant at Concord Post Acute on San Miguel Road near the Concord BART maintenance yard. “Caregivers are entrusted with attending to and caring for people in a vulnerable, and often, incapacitated state,” Bonta said in a prepared statement. “Sexual abuse is absolutely intolerable and sexually abusing a compromised individual while in a position of power over them is all the more deplorable.” The DOJ spokesperson said the Concord Police Department was not involved in the investigation.