Table 2. Elevations of the Water Table and Concentrations of Contamination This
ID: 299575 • Letter: T
Question
Table 2. Elevations of the Water Table and Concentrations of Contamination This ta table elevations in meters and concentrations of contamination in milligrams per liter (mg/L) for each of the lettered wells, and the concentration of contamination in samples from four springs and cight river segments. The location of each sample site is marked on the figure. Elev. WT s water- 150 50 Table 3. Stratigraphic Section This stratigraphic section represents the sequence of rock units that underlie the area. Consider how well groundwater would flow through each layer by considering the typical permeability for this rock type, along with the additional information contained within this figure and within the descriptions in the textbook (Chapter 17 Investigation). Basin FW-Unconsolidated sand and gravel in the lower parts of the valley Upper Sandstone-Well-sorted, permeable sandstone Upper Shale-Impermeable, with coal Sinkerton Limestone-Porous, cavernous limestone Middle Shale-Impermeable shale Lower Sandstone-Permeable sandstone Lower Shale-Impermeable shale Basal Conglomerate-Poorly sorted with salty water Granite-Sparsely fractured; oldest rock in area.Explanation / Answer
ALL INFORMATION ARE NOT PROVIDED IN THE QUESTION, THE TEXTBOOK REFERENCE, LOCATION OF THE SAMPLE SITES COULD NOT BE FOUND.
By observing the stratigraphic section given in the question, nature of the rock groups in terms of porosity as well as permeability can be well explained. Topmost part is basin fill, followed by good porous and permeable beds of sandstone. Water flows through this formation with ease, they are good aquifers. The aquifer bed is followed by an impermeable shale bed, followed by limestone. Limestone has good secondary porosity, so water flow will be good within this bed. This sequence is followed by porous but impermeable shale and porous, permeable sandstone. Basal conglomerate and granite are present below the formation, within which water flow will be difficult. No such information could be found from the question about the source of contamination of groundwater.
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