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Approved Labs

IDOT conducts specialized testing on MSE Retaining Wall Backfill, but also approves external laboratories to perform the prescreening tests on its behalf.  These external laboratories are shown on the Approved List of Laboratories to Perform Resistivity Tests

If you would like to become an approved lab please contact the department for additional instructions.

Heather Shoup
(217) 785-9972
Central Office Geotechnical Engineer
Bureau of Materials 
Office of Highways Project Implementation