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Attached is the test data. We have eliminated any test over 10 ft/day and any test which ran less than 5 min. Therefore our range of values to choose from our statistical analysis yielded the following:"Thus this firm is 95% confident that the true geometric mean K lies within the interval 0.24...

Using the Unified Soil Classification System (USCS) it classifies as SM, Sandy Silt , or Silty Sand, with a portion as ML (Silt) some gravel and cobbles througout Site. Our concern is the time of actual test, another Lab performed the Falling Head Permeability with Constant Head. Said firm is...

Is there a time constraint on the test method ? We are reviewing the results from tests performed by Others and some time periods, say less than 10 min. to complete the test once the specimen is fully saturated seems an error ? Any insight is greatly appreciated. Thanks, Sebast1973

In addition to the above post, the following expresses the question with more detail: Usually Sieve Analysis and material gradations reference the D60 particle size and the D10 particle size in order to obtain the Cu (Coefficient of uniformity) and also the D30 is used in a formula for the Cc...

Thank you for the input and feedback. Yes I was not completely sure how to word my concern. Usually Sieve Analysis and material gradations reference the D60 particle size and the D10 partical size in order to obtain the Cu (Coefficient of uniformity) and also the D30 is used in a formula for the...

What logical assumptions could one make with comparing the D80 grain size (Soil having > percentage finer than this size vs. a soil with the D60 grain size being more dominant ? Usually Sieve Analysis and material gradations reference the D60 particle size and the D10 particle size in order to...

D60 - D10 are common parameters to work with from a Grain Size Distribution. I am on a project which specifies a D80-D30 classification of the particle size. What use would the D80-D30 have over the D60-D10 ? Or has anyone come across this grain size distribution before ? The project involves...

D60 - D10 are common parameters to work with from a Grain Size Distribution. I am on a project which specifies a D80-D30 classification of the particle size. What use would the D80-D30 have over the D60-D10 ? Or has anyone come across this grain size distribution before ? The project...