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present as highly toxic and mobile hexavalent chromium. Understanding site geologic and geochemical characteristics is thus critical for predicting contaminant transport, which is a first step in deciding on a cleanup strategy. Valley and Ridge province bordering the Cumberland Plateau. Porosity is low due to fractures. High clay content. Shallow water table. Assure that the new soil that you add to your garden is approved for use in gardens. Add fresh soil, compost or mulch to your garden periodically. Consider using a new raised bed garden with clean soil and a lining over the old soil. For more information on raised beds and other best practices for gardening, please see the U.S. Environmental Protection Agency’s Growing Gardens in Urban Soils fact sheet. The soil on your property has odours, evidence of dumping of garbage, or soil staining. Play with the DIY spectrometer and build up a database to compare with for each toxic metal and organic contaminant at different concentrations. Create a color chart based on the database with many replicates to compare the colors shown from reaction with each metal and contaminant of concern. The American Geosciences Institute

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