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Herculaneum Thurwell Street Site
Site Operator: Missouri Department of Natural Resources Environmental Services Program
Pollutants Monitored: Lead (Pb)
Updated: Within 90 days after the end of a quarter.
National Ambient Air Monitoring Standard: (24-hour samples; one taken every sixth day) A three-month average of 1.5 ug/m3 (micrograms per cubic meter).
Exceedances allowed without a violation being recorded: None.
DISCLAIMER: Yearly and quarterly data shown below has been subject to data review and validation procedures by the reporting agency. Monthly data and data shown graphically is raw, unreviewed and unvalidated data.
| YEAR | NUMBER OF EXCEEDANCES |
MAXIMUM 3-MONTH AVERAGE |
MAXIMUM 24-HOUR AVERAGE |
| 2004 (instrument installed third quarter) | |||
| 2004 | 0 | .36 | .95 |
| 2005 | |||
| FIRST QUARTER | 0 | .224 | 1.462 |
| SECOND QUARTER | 0 | .142 | |
| THIRD QUARTER | Instrument removed | not available | |
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