Our analytical approach was based on long-term in-house methods used on food samples and other matrices. Our goal was to detect a broad range of contaminants. As we did not know what chemicals were present prior to sample analysis, we opted for minimal sample processing to avoid removing any unknowns. We analyzed weekly composite samples for a total of 15 weeks which covered the early stages of the pandemic and shut down as well as the initial stages of re-opening. All dates are within the year 2020.