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Cross -Vallev Transects <br />Groundwater levels for selected dates were combined with surface profile data to <br />produce a two - dimensional view of the groundwater levels next to each site. Dates were <br />selected to represent the lowest and highest observed periodic measurements, and a median <br />groundwater profile for the spring and summer seasons. The median profiles were selected to <br />represent as close as possible a day when D50 depths were observed at the continuously <br />monitored wells at each site. Surface profiles outside the study areas were "smoothed" by <br />plotting only the surface elevations at the well, instead of plotting the complete surface profile. <br />The complete surface profile included too much variation to show with the scale used for the <br />graphs. The graphs are oriented so that the observer is looking down valley, and the vertical <br />scale is exaggerated to emphasize the groundwater levels. River stage is shown for a specific <br />date, which may or may not correspond to the river stage at other times when the groundwater <br />elevations are presented. <br />Groundwater -Level Contours <br />Groundwater contour maps were generated for selected dates to produce a "three- <br />dimensional" view of the groundwater level at each site. Dates were selected to represent the <br />lowest and highest observed periodic measurements, and a median groundwater level for the <br />spring and summer seasons. The median levels were selected to represent, as close as <br />possible, a day when D50 depths were observed at the continuously monitored wells. Contours <br />were generated by forming a regular matrix of equally spaced elevations from the groundwater <br />well grid. PROC G3GRID (SAS Institute Inc. 1990b) was used to generate this regular matrix <br />of groundwater elevations. The contours were then superimposed over additional geographic <br />information for each site using the FORTRAN subroutines provided by DISSPLA (Computer <br />Associates International Inc. 1987). Surface water elevations between each river -stage gage <br />were estimated by linear interpolation at 100 or 200 ft intervals. Interpolation between wells <br />was also used where a river channel or the well spacing did not provide an adequate hydrologic <br />boundary to form realistic contours near the edge of each site. <br />P <br />