Abstract: At approximately 12:00 p.m. on August 22, 2013, Employee #1, a heavy equipment operator employed by All American Asphalt, was operating an asphalt roller on hot road material as part of a freeway on-ramp paving project. He began to experience dizziness, nausea, and weakness. Employee #1, who had begun his shift at approximately 6:30 a.m., took his first break and drank about a cup (paper cone cup) of water. He then resumed operating the asphalt roller. At approximately 12:30 p.m., Employee #1's symptoms of dizziness, nausea, and weakness intensified, and he was unable to continue working. Employee #1 managed to walk to a pickup truck where Coworker #1, employed by a subcontractor, was sitting. Employee #1 asked for assistance. Coworker #1 called a manager, provided water to Employee #1, and allowed Employee #1 to cool down in the pickup truck with the air conditioner running. Emergency medical services were called. Upon arrival, they began treating Employee #1 by administering IV fluids. Employee #1 then was transported by ambulance to Riverside County Regional Medical Center, where he was admitted and treated for heat related illness. Employee #1 was discharged from the hospital the following afternoon, August 23, 2013. The employer reported this incident to Cal/OSHA at approximately 6:05 p.m. on August 22, 2013. Cal/OSHA's investigation determined that All American Asphalt was primarily engaged in the construction of roads, streets, freeways, alleys, public sidewalks, guardrails, parkways, and airports. Employee #1 had been employed by All American Asphalt for approximately six days. However, prior to the day of the incident, he had not been assigned to work a full shift out in the field. A high temperature of 99 degrees Fahrenheit was recorded on August 22, 2013.