(Monaca, Pa) You may have heard an alarm coming from the Shell Polymers Plant in Monaca yesterday. Shell announced, as part of their safety plan, they will conduct a monthly test of their site-wide alarm at noon on the first Wednesday of each month. The test may be audible outside of the site, but community members do not need to take any action. In the event of a real emergency that has any impact beyond the site, Shell will inform the public, and local emergency response officials may also provide updates depending on the nature of the event.