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Stringline Setup
Verif ying Grade
91
P-32+ and P-32 Operator’s Manual P/ N: 1001547-01
If the road slopes down from the stringline, raise the stringline (Figure 166).
Figure 166: Raise Stringline: 3% Cross Slope with 2 Foot Offset
3. Repeat step 2 for each station.
Verifying Grade
Verifying grade requires measuring the distance from the cut ground to the sonic stringline. To check grade, use
a Grade Checking Lath to check the levelness and depth of cut with the sonic stringline.
The following figures show an example of a hub offset of 1.5 feet from the edge of the road, and a hike-up of
2.0 feet.
1. Construct a Grade Checking Lath using a lath, a level bubble, nails, and standard hand tools as shown in
Figure 167.
Figure 167: Grade Checking Lath
2.0' Offset
2.0'
Projected Slope
3.0% Slope X 2.00' Offset = .06'
Raise
.06'
3.0% Slope
1.5'
2.0'
Nails
Ty-wrap or Tape
Level Bubble to Lath
1.5'
90
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