Name _____________________________________
Chapter 8 Investigation Worksheet, page 1
To complete this worksheet, see the instructions in the textbook (Chapter 8 Investigation).
Table 1: Location Map
This map has locations of wells
(lettered A to P), samples of river
water (labeled R1 to R8), and
samples of springs (labeled S1 to
S4). Various farms, factories,
mines, and other facilities are also
shown. Only the roads (gray lines)
and outlines of the facilities are
shown, not the actual buildings and
other details. Colors (or shades of
gray) on the worksheet represent in
a general way the types of rocks
and sediment exposed on the
surface; check the cross section in
the textbook for details. Do the
following: (1) write the elevation of
the water table in each water well
next to the location of that well; (2)
draw large arrows showing the
direction of groundwater flow; (3)
shade in areas of contamination and
use the directions of groundwater
flow and stream flow to determine
which facilities caused the
contamination and draw a large X
over these facilities; and (4) draw
circles around two wells that are
most likely to remain free of
contamination. Reference the
textbook for additional information.
Notes: (1) a recent study has shown
that Slidetown and Springtown are
NOT sources of contamination, and
(2) contamination can follow
permeable units through the
subsurface, but is less likely to
travel through less permeable units
even though the water table is
shown as cutting across the units
(which it does).
Chapter 8 Investigation Worksheet; page 2
Table 2. Elevations of the Water Table and Concentrations of Contamination
This table shows water-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
eight river segments. The location
of each sample site is marked on
the figure.
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 8 Investigation).
Table 4. Explanation
In the space below, briefly summarize your conclusions and logic about the direction of
groundwater flow, sources of the contamination, and which wells will remain uncontaminated.
Chapter 8 Investigation Worksheet; page 3
Table 5. Multiple-Choice Questions about groundwater flow and contamination
Question
Answers
Where does the water table have a). in the eastern part of the area, near Slidetown
its lowest elevation, based on the b) near the ridge, west of Kellogg
wells?
c) near Springtown
d) in the western part of the area, by Riverton
Based on the water-table
a) to the north
elevations in wells, what is the
b) to the east
overall direction that
c) to the south
groundwater flows?
d) to the west
From your analysis, which
facilities caused the
contamination? From the list
below, choose two sites that
probably caused the
contamination. Note: a recent
geologic study has shown that
Slidetown and Springtowm are
NOT sources of contamination.
Choose a well that you predict
will remain free of
contamination.
Which is a possible
uncontaminated well that is near
a place where you would drill a
well to clean up (remediate) the
contamination flowing toward
that well.
a) Cornhead Coal Mine
b) Coal Power Plant
c) Midnight Coal Mine
d. CQ Coal Mine
e) Purely Plastics
f) Jim's Dairy
g) Earl's Fuel Depot
h) Walt's Farm
i) Metal Works
j) Driller's Farm
k) Birk Chemical Plant
a) well B
b) well C
c) well F
d) well P
a) well B
b) well O
c) well P
d) well J