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.. Introduction 2 Purpose and Scope 2 Previous Studies 2 Acknowledgments  4 Description of Study Area 4 Hydrogeology 4 Ground-Water Flow System Prior to Remedial Grouting 6 Remedial Grouting Program 6 Description of Observation Wells and Methods of Study  8 Observation Wells 8 Water-Level Data Collection and Analysis 8 Water-Quality Data Collection and Analysis 10 Effects of Remedial Grouting on the Ground-Water Flow System   11 Flow Patterns .. . .. .... . ... . ...   ... . ...  ... ..  .... .... . ... . .. ... .. ..  ...  .. ..  ....  ...   .. ... 11 Relation Between Water-Level Changes in the Reservoir, Tailwater, and Observation Wells 14 Water Chemistry    25 Sulfate Concentrations 25 Chloride Concentrations 26 Stable Isotopes 28 Hydrogen and Oxygen 28 Sulfur  31 Summary and Conclusions   33 Selected References  .. 35 FIGURES 1. Map showing Red Rock Darn study area and location of observation wells 3 2. Hydrogeologic section through the northeastern part of Red Rock Darn; trace of section shown in figure 1    5 3. Graph showing amount of grout placed during remedial grouting at Red Rock Dam  7 4. Map of potentiometric surface of the overburden, March 18, 1999  12 5. Map of potentiometric surface of the bedrock, March 18, 1999  13 6. Hydrograph showing water levels for Red Rock pool, tailwater, and selected bedrock wells on the northeast side of Red Rock Dam 16 7. Hydrograph showing water levels for Red Rock pool and selected bedrock wells on the northeast and southwest sides of Red Rock Dam  19 8. Hydrograph showing water levels for Red Rock pool and bedrock wells R-92-2 and R-92-2A on the northeast side of Red Rock Dam 20 9. Graph showing correlation coefficients between water levels in selected bedrock wells, well 30-0, pool, and tail water elevations during pre-grout and post-grout periods on the northeast side of the dam    22 I 0. Graph showing correlation coefficients between water levels in selected bedrock wells, pool, and tail water elevations during pre-grout and post-grout periods on the southwest side of the dam 24 II. Graph showing sulfate concentrations in the tail water and selected observation wells through time 26 12. Box plot showing pre-grout and post-grout sulfate concentrations for wells 23-R and 5-RB  27

Effects of remedial grouting on the ground-water flow system at Red Rock Dam near Pella, Iowa