Geology Reference
In-Depth Information
9.
a.
As an engineering geologist you are asked to assist in
Explain the reasons for your two choices, and your
the selection of possible sites for construction of a large
rejection of the third option.
distribution-center warehouse. It will be supported by
conventional footings resting below the weathered or soil
zone. Considering only geologic factors, which two of the
following geologic settings would you suggest to your
client for further study? See Table 17.3.
Site 1,
on Austin Chalk (Kau)
Site 3,
on South Bosque Shale (Ksb)
Site c,
on Brazos Terrace (Qbr2)
FIGURE 17.4
Capability of soils for septic drain fields, Waco area. The capability classification is based on the three categories of limi-
tations shown in the explanation for the map:
slight Moderate and Severe. Slight
translates to a
capable area.
Moderate
to a
Moder-
ately Capable
area with some limitations, and
Severe
to a
Not Capable or Low Capability
area. Limitations (capability) are based on
normal density of residences and soil permeability (very slowly permeable soil is severe limitation), depth to bedrock (soil less than 10
inches thick is severe limitation), slope (soil with >12 percent slope is a severe limitation), and flood hazard (any degree of overflow is a
severe limitation). Much of this map is in the severe category; classification does not apply to Lake Waco.
(Modified from Elder, 1965; used with permission).
