I am a highly experience dam designer with over 35 years experience with design of small dams.

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General Background and Experience. I have worked for the Natural Resources Conservation Service (formerly the Soil Conservation Service), in the Soil Mechanics Laboratory in Fort Worth, TX, since March 1968. I have prepared soil mechanics reports for over 500 earth dam projects. Many of the dams are large with complex geologic conditions. I have prepared course material and presented training for over 30 courses on topics such as field compaction control, shear strength, slope stability analysis, and filter design. I have assisted in geologic investigations, consulted on construction problems on numerous large, complex earthen embankments, channel, and waste storage projects. I am the author of numerous technical references used by the Agency for engineering guidance, including Appendix 10D to the Agricultural Waste Management Field Handbook, agency policy for design of clay liners for animal waste storage ponds and lagoons. I have participated in numerous forensic investigations of problems with NRCS projects including the Oceanview failure. Special Areas of Expertise Compaction and Field Density Control. I am author of the NRCS training manual on soil compaction, titled Module 5 - Compaction. I am also the author of the Training manual on Volume-Weight Relations - Module 4, and the Training Manual on the Unified Soil Classification System, Module 1. I have testified as an expert witness in litigation involving compaction issues. I was principle author of a paper on a research project to determine comparisons of the test methods for fill density, including the sand cone, calibrated cylinder, and nuclear meter. The paper will be presented at an ASTM Symposium on the subject in the Fall of 1999. Filter Design. I wrote the agency technical design reference for filter design, NEH Part 633, Chapter 26. I presented a paper at an ASDSO national conference on this subject. Dispersive Clays. I wrote the agency technical design reference for dispersive clays, Soil Mechanics Note 13. Shear Strength and Slope Stability. I prepared the course notebook and instructed in over 8 week long courses on laboratory shear strength testing and the selection of shear strength parameters for slope stability analysis, including computer solutions. I am considered the agency expert on the use of the programs SLOPE/W, UTEXAS3 and PCSTABL5. I have 30 years of laboratory experience in performing and evaluating shear strength tests. I have performed slope stability analyses for over 500 earthen embankments that I have designed. Surficial Slides in Highly Plastic Clay Embankments. I have special expertise in shallow slope failures in highly plastic clay soils. I have prepared engineering reports for failures on numerous projects involving this phenomenon, and presented two papers, at one national meeting and the other in published ASCE Discussions. I prepared a report for the City of Dallas Waste Treatment Plant on this problem. Clay Liners for Waste Storage. I have prepared soil mechanics reports for over 300 waste storage ponds constructed with NRCS design assistance. These ponds hold liquid manure from hog and dairy operations. The reports are used to document compliance with State and Federal design requirements. I prepared the Agency guidance document on this subject, Agricultural Waste Management Field Handbook, Appendix 10D. Forensic Investigations. I have investigated numerous deficiencies and prepared engineering reports with conclusions on the probable causes of the failure and recommendations for remedial measures. Investigations have involved embankments constructed on collapsible soils, foundation seepage, shallow slope failures on plastic clay dams, artesian pressures in side slope failures of excavated channels, and others. I was a member of the NRCS team investigating the Oceanview failure with primary geotechnical responsibility. Laboratory Soil Mechanics Testing. I have supervised the operations of a complete soils mechanics laboratory for over 15 years. I am expert in flexible wall permeability test procedures, triaxial shear testing, and all routine tests. Based on many years of experience, I am able to critically evaluate test results and determine reliability of data. Based on 30 years of experience in reviewing test data, I am able to evaluate data and note discrepancies in results. Publications and Presentations Soil Stabilization Technology Exchange Workshop at Denver, Colorado, in November 1989. Paper titled "Repair of a Slope Failure in a Highly Plastic Clay Embankment". Southeastern American Society of Dam Officials, at Atlanta, Georgia, in April 1992. Paper titled "Soil Conservation Service Experience with Shallow Slope Slides in Highly Plastic Clay Embankments." September, 1995, at the ASDSO National Meeting in Atlanta, GA. Paper titled, SCS Filter Design, a Step-by-Step Method A paper titled Correlations between a Simple Field Test and Relative Density Values, was presented at the October 1995, meeting of the Texas Section of ASCE and published in those proceedings. Discussion paper published in the ASCE Geotechnical Journal on a paper related to a shallow slope failure in a plastic clay embankment. The Discussion was published in the March 1996, issue. Paper presented at Infrastructure Condition Assessment Conference, Boston, MA, August 25-27, 1997, titled, Surficial Slides in Highly Plastic Clay Embankments. A Technical Note I authored titled Correlations between a Simple Field Test and Relative Density Test Values was published in the ASCE Geotechnical Journal in October 1996. Technical Review. ASDSO newsletter August 1998, Vol. 13, No. 4. The Semantics of Soil Piping and Internal Erosion. Paper presented at 1997 ASDSO National Meeting, titled, Chimney Filters and Drains in Embankment Dams. Presentation to Dam Safety Public Awareness Workshop, Hot Springs, Arkansas. July 18, 1997, sponsored by Arkansas ASDSO members. Title of presentation, Failures and Problems Related to Earthen Embankments. TR-60, the agency design manual for earthen embankments is currently being significantly revised. I authored the section of the revision pertaining to geotechnical design including slope stability criteria for NRCS structures. Soil Mechanics Note SM-13, Dispersive Clays Chapter 26, Part 633 of the National Engineering Manual, Gradation Design of Sand and Gravel Filters. Course book for 1-week course on selection of shear parameters and slope stability analyses. Memberships I am a registered PE in the State of Texas, since June 1987. (Number 62300) I have been a Member of the American Society of Civil Engineers for over 20 years. I subscribe to the Journal of Geotechnical Engineering and have so for over 24 years. I am a member of ASDSO (Association of State Dam Safety Officials)

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Earth Dam Seepage Filter Design Dispersive Clay Failures Slope Stability

dispersive clay, earth dam, failures, filter design, seepage, slope stability