Free General Well Driller Examination Practice Questions

Sample Practice Questions

Try these 10 sample questions from the General Well Driller Examination practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1A crew will drill a water-supply well in Delaware. Which staffing arrangement satisfies the individual licensing rule for the drilling work?

   1. A. A licensed well driller is in direct on-site supervision
   2. B. A licensed contractor checks the site once each week
   3. C. A pump installer reviews the completion report afterward
   4. D. A property owner gives written permission before drilling

   Answer: A

   Explanation: Section 4.2 states, "all persons who engage in any of the following activities in the State of Delaware shall be licensed by the Department as a well driller or well driver or shall be under the direct on-site supervision of a licensed well driller or well driver." Direct on-site supervision is therefore required.

   Reference: Delaware Regulations - Title 7 7302 — §4.2

2. 2A different licensed driller, rather than the application preparer, will construct a permitted Delaware well. What must that driller obtain before construction?

   1. A. A new property deed
   2. B. A new contractor license
   3. C. An authorization number
   4. D. A variance hearing date

   Answer: C

   Explanation: Section 4.1.5 states, "If a driller, other than the preparer of the application, constructs the well, that driller must obtain an authorization number prior to construction of the well."

   Reference: Delaware Regulations - Title 7 7301 — §4.1.5

3. 3What is Delaware's ordinary minimum separation between a nonpublic water-supply well and an identifiable potential source of contamination?

   1. A. 50 feet
   2. B. 75 feet
   3. C. 100 feet
   4. D. 150 feet

   Answer: C

   Explanation: Section 5.1.1.1 requires "100 feet from identifiable potential or existing sources of contamination with the exception of public wells."

   Reference: Delaware Regulations - Title 7 7301 — §5.1.1.1

4. 4A Delaware driller proposes casing made from a material other than PVC or steel. What is required before using it?

   1. A. Written Department approval
   2. B. A county plumbing permit
   3. C. A laboratory strength test only
   4. D. A public hearing

   Answer: A

   Explanation: Section 5.5.3 states, "Casing other than polyvinyl chloride (PVC) or steel shall only be used with the written approval of the Department."

   Reference: Delaware Regulations - Title 7 7301 — §5.5.3

5. 5What is the ordinary minimum annular width for a Delaware water-supply well?

   1. A. 0.5 inch
   2. B. 1 inch
   3. C. 1.5 inches
   4. D. 3 inches

   Answer: C

   Explanation: Section 5.8.2 states, "The annulus shall be a minimum of 1.5 inches wide (diameter of bore hole = outside diameter of casing plus three inches)."

   Reference: Delaware Regulations - Title 7 7301 — §5.8.2

6. 6What free chlorine residual must be maintained in potable-source water used for Delaware well construction?

   1. A. 0.5 mg/L
   2. B. 1 mg/L
   3. C. 5 mg/L
   4. D. 10 mg/L

   Answer: B

   Explanation: Section 5.3.2.1 states, "Water from a potable source shall be maintained with a free chlorine residual of one milligram per liter (mg/L)."

   Reference: Delaware Regulations - Title 7 7301 — §5.3.2.1

7. 7What pumping-capacity threshold requires a Delaware well to have a water-level access port and tube?

   1. A. Greater than 10,000 gallons per day
   2. B. Greater than 25,000 gallons per day
   3. C. Greater than 50,000 gallons per day
   4. D. Greater than 100,000 gallons per day

   Answer: C

   Explanation: Section 5.12.1 states, "All wells with a pumping capacity greater than 50,000 gallons per day shall be constructed with an access port and tube."

   Reference: Delaware Regulations - Title 7 7301 — §5.12.1

8. 8Which Delaware wells are generally subject to the well-disinfection requirement?

   1. A. Only newly constructed public wells
   2. B. All newly constructed or repaired wells, subject to listed exceptions
   3. C. Only domestic wells with submersible pumps
   4. D. Only wells deeper than 40 feet

   Answer: B

   Explanation: Section 7.1.1 states, "Disinfection of all newly constructed or repaired wells, in accordance with subsection 7.2 is required, except as noted in subsection 7.1.6 and 7.1.7."

   Reference: Delaware Regulations - Title 7 7301 — §7.1.1

9. 9Absent the emergency exception, when is a Delaware well completion report and formation log due?

   1. A. Within 15 days
   2. B. Within 30 days
   3. C. Within 60 days
   4. D. Within 90 days

   Answer: B

   Explanation: Section 8.1.1 requires submission "not later than 30 days after the construction of any well, except as required in subsection 3.13.3."

   Reference: Delaware Regulations - Title 7 7301 — §8.1.1

10. 10What must happen if a Delaware well's annular space cannot be grouted in accordance with the regulation?

    1. A. Seal the well under the prescribed sealing procedure
    2. B. Complete the well and disclose the grout deficiency on the report
    3. C. Fill the remaining annulus with native formation cuttings
    4. D. Place the well in service after a satisfactory bacteria test

    Answer: A

    Explanation: Section 5.8.13.3 states, "If the annular space cannot be grouted in accordance with these Regulations, the well shall be sealed pursuant to Section 10." The reporting, backfilling, and testing alternatives do not replace the required sealing response.

    Reference: Delaware Regulations - Title 7 7301 — §5.8.13.3