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Chlorinated hydrocarbons such as trichioroethylene and methylene chloride are common contaminants in soils at polluted sites. The chemical characterization of contaminated soils as a precursor to remediation is important. Raman Spectroscopy is especially useful for the selective determination of a broad range of compounds. A fiber-optic Raman probe suitable for use in a soil environment has been constructed and tested. The intensity of the Raman signal of the chlorinated hydrocarbons trichloroethylene and methylene chloride has been measured in a variety of standard and nonstandard soil and sand samples. The effect of the soil parameters (opacity, particle size, etc.) on the intensity of the Raman signal has been investigated. The general implications for spectroscopic fiber optic chemical sensors used in a cone penetrometer system are discussed.

This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Go¥ernment nor any agency thereof, or any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or re^onsibflity for any third party's use, or the results of such use, of any information, apparatus product or process disclosed in this report, or represents that its use by such third party would not infringe privately owned rights.

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