Lesson 1/Practice Exercise Answers
Lesson
ANSWER SHEET FOR PRACTICE EXERCISE
Learning Event
1.
blasting
1
2.
waste
1
3.
one; spiral
1
4.
subsurface; spiral
1
5.
strike; dip
2
6.
about 5; yes (Aggregates for general construction should have a hardness of 5 to 7.)
2
7.
1,316,480 loose cubic yards
2
Qt
=
8 yards x 110,00 square yards
=
880,000 cubic yards of rock (bank).
Qp
=
880,000 cubic yards x [1 - (12/100)]
=
880,000 cubic yards x (0.88)
=
774,400 cubic yards of usable rock (bank)
Check Table 3 and find that one cubic yard of average bank rock yields 1.7 cubic yards of
loose rock.
1.7 loose cubic yds x 774,400 bank cubic yds = 1,316,480 loose cubic yards
8.
no; the depth of overburden exceeds one-third the thickness of the usable material
2
9.
site reconnaissance survey, field reconnaissance, and final site selection
3
10.
current; used with other sources of information or with ground investigation
3
11.
known sites, probable sites, and possible sites
4
12.
security; environmental
2&4
24
Previous Page
