Component | Detection Limit |
4/5/22 | 4/17/22 | 4/29/22 | 5/11/22 | 5/23/22 | 6/4/22 | 6/16/22 | 6/28/22 |
---|---|---|---|---|---|---|---|---|---|
Benzene | 0.5 | 0.41 | 0.45 | 0.42 | 0.45 | 0.41 | 0.56 | 0.26 | ND |
Toluene | 0.5 | 0.48 | 0.15 | 0.48 | 0.62 | 0.37 | 1.60 | 0.75 | 0.48 |
Component | Detection Limit |
4/5/22 | 4/17/22 | 4/29/22 | 5/11/22 | 5/23/22 | 6/4/22 | 6/16/22 | 6/28/22 |
---|---|---|---|---|---|---|---|---|---|
Benzene | 1.6 | 1.31 | 1.44 | 1.34 | 1.44 | 1.31 | 1.79 | 0.83 | ND |
Toluene | 1.89 | 1.81 | 0.57 | 1.81 | 2.34 | 1.39 | 6.03 | 2.83 | 1.81 |
ND : "Non-Detect" - The chemical compound in the sample was below the Detection Limit, as defined below.
"---" - A sample was not collected at a particular date and location, or that results have not yet returned, or that results were returned but rejected for quality control reasons.
Detection Limit: The Detection Limit shown here actually refers to the laboratory reporting limit, below which the laboratory cannot accurately quantify the concentration of the said parameter.
Units: The unit of measure that each chemical concentration is reported in. Four different units of measure are commonly used to represent concentrations of compounds in air:
Ambient Air Monitoring Locations: North, South, East, West signify ambient air monitoring locations at the site prior to construction of the CDF. North-CDF, South-CDF, East-CDF, West-CDF signify ambient air monitoring locations with the CDF in place.
Ambient air monitoring stations around the CDF monitor long-term concentration trends of selected analytes that fall into several compound classes, including: polycyclic aromatic hydrocarbons (PAHs), volatile organic compounds (VOCs), metals, total suspended particulates (TSP), and polychlorinated biphenyls (PCBs).
During normal operations prior to dike construction, high-volume (HI-VOL) vacuum pump air samplers are located at the following locations: 4 at the CDF and 1 at East Chicago High School (NORTH-CDF, EAST-CDF, SOUTH-CDF, WEST-CDF, HS). During dike construction, ambient air monitoring continues in one southwest location off dike and at the school (CON-SOUTH, HS). (Air monitoring post dike construction will be defined and described at a later time.) Concentrations are compared between locations for variations between construction periods, dredging and non-dredging periods, and seasonal trends.
The U.S. Geological Survey and Argonne National Laboratory maintain an extensive database of ambient air monitoring results from 2001 to present, available above. USACE analyzes all ambient air monitoring results and posts Ambient Air Monitoring Program reports on the USACE web site.