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Indiana Harbor and Canal
Dredging and Disposal Project
Note: In July 2021, USACE began the Phase 2 dike project to expand the CDF exterior dikes by 11 feet to maintain sufficient storage capacity for the intended project life, consistent with the original project authorization and plan. Dredging is not being performed while construction is underway. As a result, PID monitoring and turbidity monitoring are on hold. Real-time air monitoring continues in temporary locations off dike at onsite northeast and southeast stations using the M1 and M2 monitors (AM1 and AM2). The M3 and M4 monitors are not operating during dike expansion. Ambient air monitoring continues in one southwest location off dike (CON-SOUTH) and at the school. Dredging activities are anticipated to resume in 2024. More information »

Ambient Air Monitoring Data

USGS Monitoring Data

Summary of Volatile Organic Compound (VOC) Analyses for the Indiana Harbor Ambient Air Monitoring Program: 2nd Quarter 2022 (04/01/2022-06/30/2022)

HS Air Monitoring Station - all units in parts per billion (ppb)
Component Detection
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

HS Air Monitoring Station - all units in micrograms per cubic meter (ug/m3)
Component Detection
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:

  • ppb: Part per billion - One part per billion is 1 part in 1,000,000,000
  • µg/m3: Micrograms per cubic meter of air – One microgram is 10-6 of a gram
  • ng/m3: Nanograms per cubic meter of air – One nanogram is 10-9 of a gram
  • pg/m3: Picograms per cubic meter of air – One picogram is 10-12 of a gram

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.

About this Data

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.

Ambient air monitoring locations on the perimeter of the CDF and at the high school