The user of this geochemical data is advised to incorporate loss on ignition (LOI) and the particle size analysis (PSA) data into their interpretations. The user is encouraged to verify critical data by re-sampling prior to making site specific interpretations. This data release is preliminary and does not include sample sites culled from the data set that require field verification and/or re-sampling. Further data releases containing verified and new infill sample sites and a final report/interpretation are future products of this project. Data are available as MicrosoftÂ® ExcelÂ® 2003 (.xls) files.

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Mean Diameter, in microns, of the Volume distribution represents the center of gravity of the distribution. Implementation of the equation used to calculate MV would show it to be weighted (strongly influenced) by coarse particles. It is a type of 'average particle size'.

Mean Diameter, in microns, of the Number Distribution is calculated using the volume distribution data and is weighted to the small particles. This type of 'average particle size' is related to population.

Mean Diameter, in microns, of the Area Distribution is calculated from the volume distribution. The area mean is a type of 'average' that is less weighted than MV by the presence of coarse particles, and therefore shows smaller particle size. Mean diameter represents a particle surface measurement.

Provides an indication of specific surface area. The CS computation assumes smooth, solid, spherical particles. It should not be interchanged with BET or other adsorption methods of surface area determination. Calculated specific surface area does not reflect porosity or unique topographic characteristics of particles.

In microns, describes the width of the measured particle size distribution. It does not provide an indication of the statistical error about the mean of multiple measurements. ]]>

Mean Diameter, in microns, of the Volume distribution represents the center of gravity of the distribution. Implementation of the equation used to calculate MV would show it to be weighted (strongly influenced) by coarse particles. It is a type of 'average particle size'.

Mean Diameter, in microns, of the Number Distribution is calculated using the volume distribution data and is weighted to the small particles. This type of 'average particle size' is related to population.

Mean Diameter, in microns, of the Area Distribution is calculated from the volume distribution. The area mean is a type of 'average' that is less weighted than MV by the presence of coarse particles, and therefore shows smaller particle size. Mean diameter represents a particle surface measurement.

Provides an indication of specific surface area. The CS computation assumes smooth, solid, spherical particles. It should not be interchanged with BET or other adsorption methods of surface area determination. Calculated specific surface area does not reflect porosity or unique topographic characteristics of particles.

In microns, describes the width of the measured particle size distribution. It does not provide an indication of the statistical error about the mean of multiple measurements. ]]>