This article presented the newest issues of experimental activities of the authors, objectified in terms of solving the project, in area of assessment the quality of ground structures of the engineering constructions by the device WS 32830, according to CLEGG. This device quantifies the value of rate of compaction on the basis in situ tests of Clegg Impact Value values (CIV), which can be re-counted on Californian Bearing Ratio values (CBR). In submitted contribution, are published conclusions of objectified calculation CIV on CBR determined by STN 72 1016 and on the values of dynamic deformation modulus E^ sub vd^ measured by apparatus LDP 100.