Yes samples are required and tests by an accredited civil engineering materials testing facility?

The tests required are:

Indicators = Grading and Atterberg limits (TMH1 Method A1, A2, A3 and A5)

CBR  =  California Bearing Ratio (TMH1 Method A8)

UCS  = Unconfined Compression Strength (TMH1 Method A14)

ITS  =  Indirect Tensile Strength (TMH1 Method A16T)

W/D brushing  =  Wet-dry brushing test (TMH1 Method A19)

Or the ASTM equivalents.