GROUNDWATER CERTIFICATION
NGWA - STUDY QUESTIONS -
GENERAL DRILLING EXAM
(ANSWERED) CORRECTLY TO A+
SCORE A+ 2026/2027
Complete Blueprint Coverage
A+ 5 100%
QUESTIONS VERIFIED EXAM DOMAINS COVERED RATIONALES INCLUDED
CATEGORIES
Site Mobilization, Safety & Regulations
Hydrogeology & Groundwater Principles
Well Construction, Casing, Screens & Grouting
Well Development, Rehabilitation & Decommissioning
Drilling Methods, Fluids & Operations
STUVIAACTUALEXAM
,SECTION 1: SITE MOBILIZATION, SAFETY & REGULATIONS
Q1.
A drilling crew arrives at a rural residential site to install a new domestic water well. Overhead power lines cross the proposed
access path and the property contains an existing septic system 80 feet from the intended well location. Before positioning the
rig, the lead driller must complete which primary site assessment action to protect both personnel and groundwater quality?
A. Measure the exact distance from the septic tank to the nearest property line and record it on the well log
B. Contact the utility company for line location and verify setback distances from potential contamination sources against
local code
C. Install temporary fencing around the entire property boundary to exclude unauthorized personnel
D. Begin drilling a pilot hole to confirm the absence of underground utilities before any other work
Correct Answer: B
Rationale:
Site mobilization requires identification of overhead and underground hazards plus verification of sanitary setbacks. Contacting utilities for line
location and confirming regulatory setbacks from septic systems are mandatory first steps to prevent electrocution and aquifer contamination.
Q2.
During mobilization of a truck-mounted rotary rig onto soft agricultural soil after recent rainfall, the crew observes that the
outriggers will rest on unstable ground. The most appropriate immediate corrective measure to ensure rig stability is to:
A. Increase the hydraulic pressure on the outriggers to force them deeper into the soil
B. Place timber mats or steel plates under the outriggers to distribute the load over a larger area
C. Reduce the mast height by 50 percent before raising it to lower the center of gravity
D. Park the support truck alongside the rig so that both vehicles share the soft-ground load
Correct Answer: B
Rationale:
Soft ground requires load distribution. Timber mats or steel plates increase the bearing area, reducing ground pressure and preventing outrigger
sinkage that could topple the mast. Simply increasing hydraulic pressure or reducing mast height does not address the fundamental bearing
capacity problem.
Q3.
A crew member is preparing to climb the derrick to inspect the crown block. The site safety plan requires fall protection for any
work above a specified height. According to standard industry practice and OSHA construction rules applicable to drilling
operations, personal fall-arrest systems become mandatory when working at or above:
A. 4 feet above the ground or lower level
B. 6 feet above the ground or lower level
C. 10 feet above the ground or lower level
D. 15 feet above the ground or lower level
Correct Answer: B
Rationale:
OSHA 29 CFR 1926 requires fall protection at 6 feet in construction work, which includes drilling-rig activities. Derrick work above this height
necessitates a full-body harness, lanyard, and suitable anchorage point.
, NGWA - STUDY QUESTIONS - GENERAL DRILLING EXAM 2026/2027 STUVIAACTUALEXAM
Q4.
While reviewing the job hazard analysis for a new monitoring-well installation near a former industrial site, the supervisor notes
that hydrogen sulfide may be present in the subsurface. The correct pre-job control measure is to:
A. Provide each worker with a half-face respirator rated only for organic vapors and proceed with drilling
B. Establish continuous atmospheric monitoring at the wellhead and ensure workers are trained in H2S recognition and
emergency response
C. Schedule the work exclusively during daylight hours so that natural ventilation disperses any gas
D. Require all personnel to remain inside the support vehicle until the first 50 feet of borehole have been completed
Correct Answer: B
Rationale:
Hydrogen sulfide is a highly toxic gas that can be released during drilling in contaminated or organic-rich formations. Continuous monitoring and
documented training are essential controls; simple respirators or daylight-only schedules do not provide adequate protection.
Q5.
A drilling contractor is required to transport a 40-foot length of 6-inch steel casing on a public highway. The load extends 4 feet
beyond the rear of the trailer. The minimum legal marking requirement for this overhanging load is:
A. A single red flag attached to the rear bumper of the towing vehicle
B. A red flag or approved marker at the extreme rear of the load, visible from both sides and the rear
C. Reflective tape applied along the full length of the casing
D. No special marking is required provided the vehicle is operated only during daylight hours
Correct Answer: B
Rationale:
Most jurisdictions require a red flag or approved marker at the extreme end of any load that projects more than a few feet beyond the vehicle.
Visibility from both sides and the rear is mandatory to alert following traffic.
Q6.
Before raising the mast on a new drill site, the crew discovers that the level indicator on the rig shows a 3-degree tilt. The correct
action is to:
A. Raise the mast carefully while monitoring the indicator, then correct the tilt with the outriggers once the mast is fully
vertical
B. Level the carrier frame with the outriggers or cribbing until the indicator reads zero before any mast elevation begins
C. Proceed with mast elevation because a 3-degree tilt is within normal operating tolerance for most rotary rigs
D. Remove the level indicator and rely solely on visual estimation of mast verticality
Correct Answer: B
Rationale:
The carrier must be leveled before the mast is raised. Raising a tilted mast creates dangerous side loads on the structure and can cause
catastrophic failure. Zero tilt must be confirmed prior to elevation.
NGWA - STUDY QUESTIONS -
GENERAL DRILLING EXAM
(ANSWERED) CORRECTLY TO A+
SCORE A+ 2026/2027
Complete Blueprint Coverage
A+ 5 100%
QUESTIONS VERIFIED EXAM DOMAINS COVERED RATIONALES INCLUDED
CATEGORIES
Site Mobilization, Safety & Regulations
Hydrogeology & Groundwater Principles
Well Construction, Casing, Screens & Grouting
Well Development, Rehabilitation & Decommissioning
Drilling Methods, Fluids & Operations
STUVIAACTUALEXAM
,SECTION 1: SITE MOBILIZATION, SAFETY & REGULATIONS
Q1.
A drilling crew arrives at a rural residential site to install a new domestic water well. Overhead power lines cross the proposed
access path and the property contains an existing septic system 80 feet from the intended well location. Before positioning the
rig, the lead driller must complete which primary site assessment action to protect both personnel and groundwater quality?
A. Measure the exact distance from the septic tank to the nearest property line and record it on the well log
B. Contact the utility company for line location and verify setback distances from potential contamination sources against
local code
C. Install temporary fencing around the entire property boundary to exclude unauthorized personnel
D. Begin drilling a pilot hole to confirm the absence of underground utilities before any other work
Correct Answer: B
Rationale:
Site mobilization requires identification of overhead and underground hazards plus verification of sanitary setbacks. Contacting utilities for line
location and confirming regulatory setbacks from septic systems are mandatory first steps to prevent electrocution and aquifer contamination.
Q2.
During mobilization of a truck-mounted rotary rig onto soft agricultural soil after recent rainfall, the crew observes that the
outriggers will rest on unstable ground. The most appropriate immediate corrective measure to ensure rig stability is to:
A. Increase the hydraulic pressure on the outriggers to force them deeper into the soil
B. Place timber mats or steel plates under the outriggers to distribute the load over a larger area
C. Reduce the mast height by 50 percent before raising it to lower the center of gravity
D. Park the support truck alongside the rig so that both vehicles share the soft-ground load
Correct Answer: B
Rationale:
Soft ground requires load distribution. Timber mats or steel plates increase the bearing area, reducing ground pressure and preventing outrigger
sinkage that could topple the mast. Simply increasing hydraulic pressure or reducing mast height does not address the fundamental bearing
capacity problem.
Q3.
A crew member is preparing to climb the derrick to inspect the crown block. The site safety plan requires fall protection for any
work above a specified height. According to standard industry practice and OSHA construction rules applicable to drilling
operations, personal fall-arrest systems become mandatory when working at or above:
A. 4 feet above the ground or lower level
B. 6 feet above the ground or lower level
C. 10 feet above the ground or lower level
D. 15 feet above the ground or lower level
Correct Answer: B
Rationale:
OSHA 29 CFR 1926 requires fall protection at 6 feet in construction work, which includes drilling-rig activities. Derrick work above this height
necessitates a full-body harness, lanyard, and suitable anchorage point.
, NGWA - STUDY QUESTIONS - GENERAL DRILLING EXAM 2026/2027 STUVIAACTUALEXAM
Q4.
While reviewing the job hazard analysis for a new monitoring-well installation near a former industrial site, the supervisor notes
that hydrogen sulfide may be present in the subsurface. The correct pre-job control measure is to:
A. Provide each worker with a half-face respirator rated only for organic vapors and proceed with drilling
B. Establish continuous atmospheric monitoring at the wellhead and ensure workers are trained in H2S recognition and
emergency response
C. Schedule the work exclusively during daylight hours so that natural ventilation disperses any gas
D. Require all personnel to remain inside the support vehicle until the first 50 feet of borehole have been completed
Correct Answer: B
Rationale:
Hydrogen sulfide is a highly toxic gas that can be released during drilling in contaminated or organic-rich formations. Continuous monitoring and
documented training are essential controls; simple respirators or daylight-only schedules do not provide adequate protection.
Q5.
A drilling contractor is required to transport a 40-foot length of 6-inch steel casing on a public highway. The load extends 4 feet
beyond the rear of the trailer. The minimum legal marking requirement for this overhanging load is:
A. A single red flag attached to the rear bumper of the towing vehicle
B. A red flag or approved marker at the extreme rear of the load, visible from both sides and the rear
C. Reflective tape applied along the full length of the casing
D. No special marking is required provided the vehicle is operated only during daylight hours
Correct Answer: B
Rationale:
Most jurisdictions require a red flag or approved marker at the extreme end of any load that projects more than a few feet beyond the vehicle.
Visibility from both sides and the rear is mandatory to alert following traffic.
Q6.
Before raising the mast on a new drill site, the crew discovers that the level indicator on the rig shows a 3-degree tilt. The correct
action is to:
A. Raise the mast carefully while monitoring the indicator, then correct the tilt with the outriggers once the mast is fully
vertical
B. Level the carrier frame with the outriggers or cribbing until the indicator reads zero before any mast elevation begins
C. Proceed with mast elevation because a 3-degree tilt is within normal operating tolerance for most rotary rigs
D. Remove the level indicator and rely solely on visual estimation of mast verticality
Correct Answer: B
Rationale:
The carrier must be leveled before the mast is raised. Raising a tilted mast creates dangerous side loads on the structure and can cause
catastrophic failure. Zero tilt must be confirmed prior to elevation.
