This paper presents the results of an assessment of a number of soil-grout mixes for the stabilisation/solidification of a sand contaminated with methylene blue. It forms part of an extensive research programme into the in-situ stabilisation/solidification of soils contaminated with organics. The design criteria used were strength and leachability. A natural and an organophilic bentonites were used as the stabilising agents. The results showed that methylene blue was adsorbed by the natural bentonite to the same extent as the organophilic bentonite. The concentration of methylene blue did not have any measurable effect on the strength of the solidified soil-grout mix. Suitable soil-grout mixes were developed which had a soil:grout ratio of 4:1. The optimum soil-grout mix contained 6% cement and 2% bentonite and satisfied both the strength and leachability criteria specified.