1. PROGRESS ON “STRUCTURAL CONTROLS ON THE EDWARDS/TRINITY AQUIFER INTERFACE, CAMP BULLIS QUADRANGLE, TEXAS” Presented by David A. Ferrill Contributors: Darrell Sims, Deborah Waiting, Alan Morris, Alvin Schultz, Allan Clark Southwest Research Institute ® Center for Nuclear Waste Regulatory Analyses February 2003 PROGRESS ON “STRUCTURAL CONTROLS ON THE EDWARDS/TRINITY AQUIFER INTERFACE, CAMP BULLIS QUADRANGLE, TEXAS” Presented by David A. Ferrill Contributors: Darrell Sims, Deborah Waiting, Alan Morris, Alvin Schultz, Allan Clark Southwest Research Institute ® Center for Nuclear Waste Regulatory Analyses February 2003

2. Page 2 OVERVIEW w3D Geologic Framework Modeling - Castle Hills Quadrangle (completed during previous project) w3D Geologic Framework Modeling - Camp Bullis Quadrangle wField work to characterize faults in Glen Rose Limestone w3D Geologic Framework Modeling - Castle Hills Quadrangle (completed during previous project) w3D Geologic Framework Modeling - Camp Bullis Quadrangle wField work to characterize faults in Glen Rose Limestone

3. Page 3 CASTLE HILLS QUADRANGLE 3D MODEL AREA

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20. Page 20 CAMP BULLIS QUADRANGLE wDigital terrain model wWell data (43 wells) wGeologic mapping –faults –outcrop geology –structure contours wDigital terrain model wWell data (43 wells) wGeologic mapping –faults –outcrop geology –structure contours

21. Page 21 CAMP BULLIS QUADRANGLE wModel horizons –Kainer Formation –Upper Glen Rose –Lower Glen Rose –Bexar Shale –Cow Creek –Pine Island Shale –Sligo Limestone wModel horizons –Kainer Formation –Upper Glen Rose –Lower Glen Rose –Bexar Shale –Cow Creek –Pine Island Shale –Sligo Limestone

22. Page 22 FIELD WORK TO CHARACTERZIE FAULTS IN GLEN ROSE LIMESTONE wRalph Fair Road wState Route 46 wHighway 281 & H.L. Chapman Pipeline Construction Company wCanyon Lake Spillway wRalph Fair Road wState Route 46 wHighway 281 & H.L. Chapman Pipeline Construction Company wCanyon Lake Spillway

23. Page 23 H.L. CHAPMAN PIPELINE CONSTRUCTION COMPANY

24. Page 24 H.L. CHAPMAN PIPELINE CONSTRUCTION COMPANY

25. Page 25 CANYON LAKE SPILLWAY GORGE

26. Page 26 FAULTS IN CANYON LAKE SPILLWAY GORGE

27. Page 27 FAULT ZONE IN CANYON LAKE SPILLWAY GORGE

28. Page 28 FAULT ZONE IN CANYON LAKE SPILLWAY GORGE

29. Page 29 OBSERVATIONS TO DATE wFaults in Glen Rose typically less steep that faults in Edwards Group wImportant stratal (limestone and shale) control on fault propagation in more shale-rich section wMore common occurrence of shale layers in Glen Rose present barriers to vertical flow along faults, and enhances lateral flow along faults wFaults in Glen Rose typically less steep that faults in Edwards Group wImportant stratal (limestone and shale) control on fault propagation in more shale-rich section wMore common occurrence of shale layers in Glen Rose present barriers to vertical flow along faults, and enhances lateral flow along faults