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An Integrated Surface-Geophysical Investigation of the University of Connecticut Landfill, Storrs, Connecticut: 2000

USGS Water Resources Investigation Report 02-4008

Prepared in cooperation with the University of Connecticut

By Carole D. Johnson, C.B. Dawson, Marcel Belaval, and John W. Lane, Jr.

CONTENTS

Abstract
Introduction
    Description of the study area
    Previous studies
    Purpose and scope
    Acknowledgments
Surface-geophysical methods and data collection techniques
    Two-dimensional direct-current resistivity profiling
    Inductive terrain-conductivity profiling and surveys
    Seismic-refraction surveys
Results of the surface-geophysical investigations in 2000
    Two-dimensional direct-current resistivity surveys
        Line 2DL8, southwest of the landfill, oriented north-south
        Line 2DL201, southwest of the landfill, oriented north-south
        Line 2DL203, southwest of the landfill, oriented west-east
    Inductive terrain-conductivity surveys
        Line EML201, north of the landfill
        Grid EMG1-N, northern extension of EMG1, southwest of the landfill
        Line EML202, southwest of the landfill
        Grid EMG1-S, southern extension of EMG1, southwest of the landfill
        Line EML203, south of the landfill
    Seismic-refraction surveys
        Line SRL201B, southwest of the landfill
        Line SRL202, north of the landfill
        Line SRL203, south of the landfill
        Line SRL204, southwest of the landfill
Integrated interpretation of geophysical investigations
    Southwest of the Landfill
    West of the landfill
    North of the landfill
    South of the landfill
Summary and conclusions
References cited

FIGURES

1. Map showing location of the surface-geophysical surveys in the UConn landfill study area, Storrs, Connecticut
2. Schematic of overview of two-dimensional resistivity inverse and forward modeling process
3. Plot showing comparison of relative response for inductive terrain-conductivity vertical and horizontal dipoles
4. Diagram showing raypaths of refracted and reflected sound energy in a two-layer earth
5. Time-distance plot for seismic data in a two-layer model with parallel boundaries showing the traveltime of the first arrival ploted against distance from the shot point
6-11. Diagrams showing sections of two-dimensional direct-current resistivity data, UConn landfill study area for:
    6. Profile 2DL8, Schlumberger array
    7. Profile 2DL8, dipole-dipole array
    8. Profile 2DL201, Schlumberger array
    9. Profile 2DL201, dipole-dipole array
    10. Profile 2DL203, Schlumberger array
    11. Profile 2DL203, dipole-dipole array
12-20. Diagrams showing:
    12. Inductive terrain-conductivity idealized vertical-dipole response to a thin, nearly vertical conductor
    13. Inductive terrain-conductivity plots for data collected along EML201, north of landfill, UConn landfill study area
    14. Contoured inductive terrain-conductivity data for EMG1 northern extension, UConn landfill study area
    15. Inductive terrain-conductivity plots for data collected along EML202 (line 9S), south of landfill, UConn landfill study area
    16. Contoured inductive terrain-conductivity data for EMG1 in 1998 to 1999, UConn landfill study area
    17. Contoured inductive terrain-conductivity data for EMG1 southern extension, UConn landfill study area
    18. Vertical-dipole inductive terrain-conductivity data along four southernmost lines in the southern extension of EMG1, UConn landfill study area
    19. Contoured inductive terrain-conductivity data for EMG1 in 1998 to 2000, UConn landfill study area
    20. Inductive terrain-conductivity data along EML203, south of the landfill, in the UConn landfill study area
21-24. Diagrams showing seismic-refraction profiles, UConn landfill study area
    21. Profile SRL201B, southwest of the landfill
    22. Profile SRL202, north of the landfill
    23. Profile SRL203, south of the landfill
    24. Profile SRL204, southwest of the landfill

TABLES

1. Frequencies and approximate maximum depth of investigation using the inductive terrain-conductivity method with varying coil spacing
2. Inductive terrain-conductivity daily drift in measurements at control site at UConn landfill study area, 1998 through 2000
3. Temporal variation in inductive terrain-conductivity measurements at control site at UConn landfill study area, 1998 through 2000

Citation: Johnson, C.D., Dawson, C.B., Belaval, Marcel, and Lane, J.W., Jr., 2002, An integrated surface-geophysical investigation of the University of Connecticut landfill, Storrs, Connecticut -- 2000: U.S. Geological Survey, Water Resources Investigations Report 02-4008, 39 p.