Arc Surveying & Mapping, Inc.

1. Arc Surveying & Mapping, Inc
Environmental Dredging Surveys
East Chicago, Illinois
www.arcsurveyors.com

2. Indiana Harbor
Jobsite East Chicago
Indiana

3. Indiana Harbor
Sediment Removal

4. Harbor History
Dredging will be undertaken throughout the Indiana Harbor and Canal to establish the navigation
depths and widths authorized by H. Doc. 1113, 60th Cong., 2d Sess., taken from the River and Harbor
Acts of 1910. Dredging will also be completed in the adjacent berthing areas outside of the
authorized channel limits at non-Federal expense to provide depths commensurate with those in the
Federal channel.
The Indiana Harbor and Canal have not been dredged since 1972 due to a lack of suitable storage
area for the contaminated sediments. The accumulated sediment backlog in the IHC will be dredged
over an 8 to 10 year period and will produce an estimated 1.6 million cubic yards of dredged
materials. These sediments currently cause pollution of Lake Michigan and affect the efficiency of
deep draft commercial navigation. After backlog dredging is complete, maintenance dredging will
take place, as necessary, over a period of approximately 20 years, to remove accumulated sediments
and maintain navigable depths in the harbor and canal.
Dredging will be performed using a closed bucket mechanical dredge. The dredged material will be
loaded onto barges or scows that will be then moved to the disposal area. Next, dredged material
will be mixed with water (slurried) that is obtained from the CDF, to make a mud-mixture. This slurry
is then pumped into the CDF and allowed to settle. As the sediment settles to the bottom, clean
water remains at the surface, which can then be recycled for additional sediment placement.

5. Excavating Contaminated Sediments

6. Transfer Sediment to Disposal

7. Services Provided By Arc
• Establish Horizontal & Vertical Control
• Geo-reference survey data to appropriate State Plane Coordinate
System and National Vertical Datum
• Perform Multibeam Swath Hydrographic Survey
• Collect depths of 100 % of the seafloor
• Perform Side Scan Sonar
• Locate objects lying on or protruding above the seafloor
• Perform Sub-Bottom Sonar Survey
• Locate sub-bottom and some buried objects
• Perform Magnetometer Survey
• Locate ferrous metals
• Perform Optical Laser scan Shore Side Survey
• Survey shoreline from survey vessel
• Compute Remediation Excavation Quantities
• Provide Plans, Cross-sections and excavation quantities

8. Launch & Equipment Installation

9. Establish Horizontal & Vertical Control

10. Topographic Laser Scan Data
Topography Laser Scanned From Survey Vessel
Riegl BV5000 Terrestrial Laser scanner

11. Interactive Topographic & Hydrographic
Survey Model

12. Combined Bathymetry & Topography
Multibeam Swath Bathymetry collected utilizing
Reson 7125 SeaBat

13. 100% Underwater Coverage
512 beams – 165 degree swath - 400/200 kHz
Seamless data Collection

14. Sheeting & Seafloor Interface

15. Arc Survey Cover Drawing

16. Bathymetry & Topography Collected
Simultaneously
Laser Scan Data
Hydrographic Data

17. Magnetometer Survey
Locate & Map Ferrous Metals

18. Side – Scan & Sub-Bottom Survey
Locate Objects on the seafloor
Locate Centerline Profile And Sub-Bottom
Targets 1, 2 and 3

19. Side Scan Seafloor Targets

20. Cross Sections Required & Overdepth
Excavation

21. Indiana Harbor Sediment Remediation
www.arcsuveryors.com