Jeffrey A. Farrar

United States Bureau of Reclamation- Retired · Earth Sciences Laboratory- Retired

Earth Manual is a reference book on use of soils and rock for construction of earth Dams and miscellaneous structures

For proper groundwater monitoring well design, ASTM D5092 recommends that drillers collect soil samples from candidate screen zones, conduct sieve analyses, and use selected grain size diameter values to determine appropriate filter pack gradation and screen slot size requirements. The recommended well design approach described in D5092 requires ad...

The US Bureau of Reclamation is responsible for the safe performance of many dams West of the Mississippi. Embankment dams are susceptible to uncontrolled seepage and possible failure by piping and internal erosion. Engineers need tests that will assist in evaluating risk of piping, and in the mid 1990's there was no commonly accepted test for eval...

Foundation Investigations for Structures

This report summarizes the work of Dr. G.P. Gould who studied instrumented performance of Earth Dams during a 3 year stay at the Bureau of Reclamation. Settlement and pore pressures were measured in over 20 earth dams from a period of the 1930s through the 1950s. Detailed measurements were made possible by using multiple cross arm settlement column...

The United States Department of the Interior, Bureau of Reclamation has a long history of development of large water supply projects in the western United States. Reclamation developed unique earthwork control techniques such as the Rapid Method of Construction Control. The Rapid Method is a three-point impact compaction test based on standard impa...

In order to evaluate liquefaction potential at Terminus Dam, investigations consisting of Becker Penetration Testing, cross-hole shear wave velocity, and Standard Penetration Testing (SPT) were performed. SPT drill rod lengths of up to 60 m (200 ft) were anticipated. Measurements were made to evaluate the loss in transmitted energy in long drill ro...

U S Bureau of Reclamation Filed Manual for engineering geologic logging.

Research and standardization needs in the area of direct push sampling and testing is reviewed. Direct push testing and sampling is a rapidly growing area in environmental site characterization. Direct push active soil gas sampling techniques are well accepted for environmental site investigations in the vadose zone. Standardization efforts are und...

Soil Testing Procedures, U S Bureau of Reclamation

Deep Soil Mixing, Heat of Neutralization test, Cement Content, Quality Control

A major part of the US‐Japan Co‐operation Programme concerns earthquake research; results are presented here of a study of field practices in those countries and elsewhere of the Standard Penetration Test, in which the equipment and procedures used led to anomalies in energy ratios and N‐values. Accordingly a standard energy ratio of 60 percent is...

Detailed examination of compression and pore pressure generation in 30 rolled earth filled dams by U S Bureau of Reclamation