The materials tested were:

1. Sand
2. Sand and Gravel
3.  Silt, some with clay

A complete description of the three materials is appended on the material identification sheet to follow.  There were two kinds of test methods used to obtain the necessary information for the analysis of the three materials.  The first method was the sieving method, which is the most direct method for determining particle sizes.  A detailed procedure for performing the sieve analysis and distribution of particle sizes is presented in the American Society for Testing Methods (ASTM) under the D422 designation.  Material number 1 and 2 were tested using this designation.  Material number 3 was tested using the hydrometer test method, and details for this test method are also described by the ASTM test designation D422.  The results were graphed for all three tests and these results are appended on the grain size distribution and hydrometer analysis sheets to follow.

Three tests were completed to analyze the proposed materials for the dam filter, a road for access to the site and the dam core.  The results of the test depict that sample number 1, the sand, is best suited for the filter sand behind the core of the dam due to its poorly graded nature.  Sample number 2, the sand and gravel, would provide optimum usage as a material to use for the access road due to its well graded nature, angular gravel's for good traction and its trace of silt and clay.  Finally material number 3 is the best material to use for the core of the dam because it has a sufficient amount of silt and clay, is very impermeable, and would provide the least amount of leakage.  The clay exceeds 30%, which is a very secure amount of clay for a dam core.  The results of all the tests are appended on the work sheets to follow for a more detailed description.
If further testing is required, please feel free to contact me.

Yours truly,

Karla McDonald

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