WVDOH: SOIL & AGGREGATE
COMPACTION INSPECTOR EXAM
QUESTIONS AND ANSWERS 2026
VERIFIED.
The sample size required for a moisture determination when a rerun proctor is necessary (stove
dry) according to MP 207.07.20 is?
(Program Manual MP 207.07.20, Page 9 of 12) - ANS 200 to 400 grams.
According to the Standard Specifications, soil, granular material, soft shale and random material
shall be place in embankments in successive layers not exceeding _____________ thickness
after compaction.
(Program Manual MP 717.04.21, Table C, Attachment #3) - ANS 6 inches
When a soil has zero air voids, what does this mean? - ANS The soil has been compacted to
the point that all air voids are filled with moisture.
Who is responsible for quality control? - ANS Contractor
Who is responsible for acceptance testing? - ANS Division of Highways
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 15
, What corrective action would be required by the contractor for a lot of embankment material
which exhibits pronounced rutting and pumping under the weight of the construction
equipment? - ANS Scarify, aerate and re-compact before conducting any additional testing or
remove the material and replace it with suitable material.
According to the Standard Specifications, in places inaccessible to a roller, such as adjacent to
culverts, retaining walls and other structures, the fill materials shall be place in __________
compacted layers uniformly compacted with approved tampers.
(Standard Specifications Book Page 120) - ANS 4 inches
What are the types of radiation produced by a nuclear gauge? - ANS Alpha Particles,
Neutrons, Gamma, and Beta
What are the following methods for protection from radiation produced by a nuclear gauge? -
ANS Shielding, Time, and Distance
How are soils classified? - ANS Particle Size
In NO case should you place embankment fill when?
(Std. Specs. Book Page 119) - ANS The Ground is Frozen
What is the minimum percentage for 100% pay of a lot for quality index? - ANS 80%
What is the moisture tolerance when performing a One-Point Proctor? - ANS +3/-4 Percent
What are the requirements for a compactor used in a soft shale harness test? - ANS The
compactor must have a minimum coverage of 500 pounds per linear inch, or 500 pounds per
square inch of tamping foot contact
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 15
COMPACTION INSPECTOR EXAM
QUESTIONS AND ANSWERS 2026
VERIFIED.
The sample size required for a moisture determination when a rerun proctor is necessary (stove
dry) according to MP 207.07.20 is?
(Program Manual MP 207.07.20, Page 9 of 12) - ANS 200 to 400 grams.
According to the Standard Specifications, soil, granular material, soft shale and random material
shall be place in embankments in successive layers not exceeding _____________ thickness
after compaction.
(Program Manual MP 717.04.21, Table C, Attachment #3) - ANS 6 inches
When a soil has zero air voids, what does this mean? - ANS The soil has been compacted to
the point that all air voids are filled with moisture.
Who is responsible for quality control? - ANS Contractor
Who is responsible for acceptance testing? - ANS Division of Highways
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 15
, What corrective action would be required by the contractor for a lot of embankment material
which exhibits pronounced rutting and pumping under the weight of the construction
equipment? - ANS Scarify, aerate and re-compact before conducting any additional testing or
remove the material and replace it with suitable material.
According to the Standard Specifications, in places inaccessible to a roller, such as adjacent to
culverts, retaining walls and other structures, the fill materials shall be place in __________
compacted layers uniformly compacted with approved tampers.
(Standard Specifications Book Page 120) - ANS 4 inches
What are the types of radiation produced by a nuclear gauge? - ANS Alpha Particles,
Neutrons, Gamma, and Beta
What are the following methods for protection from radiation produced by a nuclear gauge? -
ANS Shielding, Time, and Distance
How are soils classified? - ANS Particle Size
In NO case should you place embankment fill when?
(Std. Specs. Book Page 119) - ANS The Ground is Frozen
What is the minimum percentage for 100% pay of a lot for quality index? - ANS 80%
What is the moisture tolerance when performing a One-Point Proctor? - ANS +3/-4 Percent
What are the requirements for a compactor used in a soft shale harness test? - ANS The
compactor must have a minimum coverage of 500 pounds per linear inch, or 500 pounds per
square inch of tamping foot contact
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 15
