Laserfiche WebLink
Enclosure, Sharpe RI Report -3- <br /> 8 March 1991 <br /> Sharpe Site <br /> usefulness of this model is limited and application of this model would <br /> seem to be burdensome and ineffectual . <br /> RECOMMENDATIONS FOR WORK PRODUCTS TO VERIFY CONCEPTUAL MODEL <br /> • Construct two regional cross-sections with one section trending north-south <br /> and the other trending east-west. Logs from the wells within an eight mile <br /> radius, which were reported to exist, should be used to construct the <br /> sections. Sharpe should also obtain some of the USGS water supply papers <br /> and use the information for their regional analysis. The major, regional <br /> sedimentary trends should be identified. <br /> • Revise the site cross sections. Construct the cross-section using straight <br /> lines with well projections or construct them through the wells but <br /> eliminate any acute angles (use only obtuse angles) . Construct one cross- <br /> section through each plume in the direction of ground water flow. Identify <br /> the major sedimentary trends which correlate with the regional cross- <br /> sections. <br /> • Collect ground water samples from well clusters that have A, B, C and D <br /> wells and analyze for general minerals. Use trilinear diagrams to plot the <br /> data to determine if there is any chemical differences between the "zones" . <br /> This typing will help to indicate how many zones there are. <br /> • Construct hydrographs for monitor wells with the longest historical records <br /> and for the well clusters with four wells. Use the hydrographs to <br /> determine if the different zones have the same patterns. This will <br /> indicate whether the zones are or are not hydraulically different. <br /> • Construct ground water contour maps for each of the four "zones" . <br /> Construct two maps for each zone, one using ground water elevations from <br /> January or February which will represent the wet season flow conditions, <br /> and one map using elevations from July or August which will represent dry <br /> season conditions. The different maps will also help to determine how many <br /> major water bearing zones there really are. Additionally, these maps <br /> should be constructed for two years, so there would be a total of eight <br /> flow maps. <br /> • Verify all computer generated contour maps. Acute angles must be <br /> eliminated and lines should be smoothed. Contours should not be closed <br /> unless there is a well point to support closure. Dashed lines should be <br /> used. <br /> • Construct contaminant concentration versus time graphs for wells with the <br /> longest historical records and for well clusters at the center and near the <br /> leading edges of the plumes. Patterns in contaminant concentrations should <br /> be compared to the patterns observed on the hydrographs and hydrographs of <br /> precipitation. <br />