Passive Air Monitoring System (PAMS) Data
Shell Polymers Monaca conducts bi-weekly passive sampling for chemicals of potential concern, including benzene, 1,3-butadiene, n-hexane, naphthalene, and toluene. The site has 20 Passive Air Monitoring System (PAMS) locations.
The PAMS samples are collected and analyzed in accordance with 40 CFR 63.658(e)(1)-(2). These regulations prescribe methods for passive absorption sampling in which clean, absorbent tubes are deployed and collected every two weeks and sent to a third-party analytical laboratory for analysis. Upon collection of the used sampling tubes, a new set of tubes are deployed to begin sample collection for the next two-week period. Benzene concentration delta [or (Δc)] is reported from the two-week sample period and is calculated using the minimum and the maximum individual monitoring point sample results. If the two-week Δc is greater than the applicable action threshold, an investigation is initiated within 24 hours.
Passive Air Monitoring System (PAMS)
- PAMS Report 09-10-25 (PDF, 54 kB)
- PAMS Report 08-27-25 (PDF, 54 kB)
- PAMS Report 08-13-25 (PDF, 54 kB)
- PAMS Report 07-30-25 (PDF, 54 kB)
- PAMS Report 07-16-25 (PDF, 54 kB)
- PAMS Report 07-02-25 (PDF, 54 kB)
- PAMS Report 06-18-25 (PDF, 54 kB)
- PAMS Report 06-04-25 (PDF, 54 kB)
- PAMS Report 05-21-25 (PDF, 54 kB)
- PAMS Report 05-07-25 (PDF, 54 kB)
- PAMS Report 04-23-25 (PDF, 54 kB)
- PAMS Report 04-09-25 (PDF, 54 kB)
- PAMS Report 03-26-25 (PDF, 54 kB)
- PAMS Report 03-12-25 (PDF, 54 kB)
- PAMS Report 02-26-25 (PDF, 54 kB)
- PAMS Report 02-12-25 (PDF, 54 kB)
- PAMS Report 01-29-25 (PDF, 54 kB)
- PAMS Report 01-15-25 (PDF, 54 kB)
- PAMS Report 01-02-25 (PDF, 54 kB)
