Several beaches in Los Angeles County remain under ocean water use warning Thursday, including Santa Monica State Beach, Los Angeles County Department of Public Health officials said. People are urged to be careful before playing or swimming in the ocean at the following beaches: Redondo Beach at Sapphire Street Inner Cabrillo Beach in San Pedro Mother's Beach in Marina Del Rey Santa Monica Pier in Santa Monica "The warning has been issued due to bacterial levels exceeding health standards when last tested,