B. are dug to expose subsurface structures
C. damages easily undocumented utility lines
D. often need to dig holes near some subsurface structures
E. are developed to search valuable mineral deposits
F. are dug to confirm the location of a subsurface structure
G. provides little useful depth information
H. always provides the most complete and accurate information
I. can detect very small objects
J. can detect plastic gas pipes
K. will be evaluated
L. uses gas and electricity
M. is likely to make it easier to locate the lines
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2016-02-26
2016-02-26
2016-02-26
2016-02-26
2016-02-26
2016-02-26