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D. 06JECTIVE: <br />The primary purpose of this study is to describe baseline <br />hydrogeologic conditions in the Hart Syncline area. The description <br />will be based largely on existing surface-water quality and quantity <br />information coupled with ground-water information obtained in phase 1 <br />of the study. <br />E. APPROACH: <br />To understand the hydrology of the Hart Syncline Area, existing <br />ground-water and surface-water conditions need to be determined. <br />In 1985, an energy company will be drilling exploration holes in the <br />area. This is an ideal opportunity for the U.S. Geological Survey <br />to complete some of the exploration holes as water observation <br />wells. If this approach is followed, the study will be divided <br />into two phases. <br />Phase 1 would include a preliminary review of the literature, <br />dr-Ming and completing 13 wells, and installing two stream <br />gaging stations. Drilling will be provided by industry. <br />Geologic and geophysical logging also will be done by <br />industry. The U.S. Geological Survey will complete wells <br />and conduct pumping tests. The preliminary literature review <br />will be to obtain pertinent information on the hydrology and <br />geology of the area. Four wells will be completed as soon <br />as possible after drilling. The nine other wells will be <br />used to observe water levels. Geologic and geophysical <br />logs will be run at all wells. Water levels and water <br />chemistry will be determined at each well. Ground water <br />will be analyzed for major cations, major anions, nutrients, <br />and trace elements. The samples will be taken quarterly. <br />The wells will be located throughout the study area. <br />Stream discharge and stream water quality will be determined <br />along Waddle Creek and Deep Rock Creek at stream-gaging <br />stations at the northern boundary of the study area. <br />Surface-water samples will be analyzed for major cations, <br />major anions, and nutrients through this sampling period. <br />Trace elements and sediment concentrations will be measured <br />during peak flows. Approximately 12 surface-water samples <br />will be taken during the year. Low-flow and high-flow <br />information from Waddle Creek will be compared with simi]ar <br />information from Milk Creek which is in the area and which <br />also receives most of its flow from snowmelt. <br />