Free C-57 - Well Contractor Practice Questions

Sample Practice Questions

Try these 10 sample questions from the C-57 - Well Contractor practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1Which Hawaii contractor classification must perform construction, modification, or sealing of wells governed by the state well standards?

   1. A. C-37
   2. B. C-43
   3. C. C-55
   4. D. C-57

   Answer: D

   Explanation: The standards state: "All work required in the construction, modification, or sealing of wells" must be performed by C-57-licensed well drillers.

   Reference: Hi Well Standards 2004 — Hawaii Well Construction Standards §1.6

2. 2Using the Hawaii standards' general basal-aquifer rule, one foot of saturated fresh groundwater above mean sea level is supported by about how many feet below mean sea level?

   1. A. 20 feet
   2. B. 30 feet
   3. C. 40 feet
   4. D. 50 feet

   Answer: C

   Explanation: The basal-aquifer definition gives the general relation as 1 foot above mean sea level supported by 40 feet below it.

   Reference: Hi Well Standards 2004 — Hawaii Well Construction Standards §1.4, Basal aquifer

3. 3Unless the Chairperson authorizes otherwise, what is the initial maximum depth below sea level for a nonsalt well designed in a basal aquifer?

   1. A. The full theoretical freshwater thickness
   2. B. Three-fourths of the theoretical thickness
   3. C. One-half of the theoretical thickness
   4. D. One-fourth of the theoretical thickness

   Answer: D

   Explanation: Section 2.2 initially limits the depth below sea level to one-fourth of the theoretical thickness, calculated as 41 times head.

   Reference: Hi Well Standards 2004 — Hawaii Well Construction Standards §2.2

4. 4For an ordinary above-grade Hawaii pump connection, how far above the prepared ground surface or pump-house floor should the casing top extend?

   1. A. 4 inches
   2. B. 6 inches
   3. C. 8 inches
   4. D. 12 inches

   Answer: D

   Explanation: Section 4.2(b) specifies a minimum extension of 12 inches for above-grade pump connections.

   Reference: Hi Well Standards 2004 — Hawaii Well Construction Standards §4.2(b)

5. 5For a nonartesian basal, high-level, caprock, or perched aquifer well, what minimum solid-casing length generally applies?

   1. A. 50 percent of depth to water
   2. B. 70 percent of depth to water
   3. C. 80 percent of depth to water
   4. D. 90 percent of depth to water

   Answer: D

   Explanation: Section 2.4(c) sets the general minimum solid casing at 90 percent of the depth to the water level of the aquifer developed.

   Reference: Hi Well Standards 2004 — Hawaii Well Construction Standards §2.4(c)

6. 6What minimum sequence satisfies the Hawaii step-drawdown requirement for a well to which it applies?

   1. A. Two rates held 15 minutes each
   2. B. Two rates held 30 minutes each
   3. C. Three rates held 15 minutes each
   4. D. Three progressively increasing rates held at least 30 minutes each

   Answer: D

   Explanation: Section 2.9(b) requires at least three progressively increasing discharge rates, each maintained for at least one-half hour.

   Reference: Hi Well Standards 2004 — Hawaii Well Construction Standards §2.9(b)

7. 7At what chloride concentration does the Hawaii standard's definition classify a well as a salt-water well?

   1. A. Greater than 250 mg/L
   2. B. Greater than 17,000 mg/L
   3. C. Greater than 10,000 mg/L
   4. D. Greater than 35,000 mg/L

   Answer: B

   Explanation: Section 1.4 defines a salt-water well as producing water with chloride greater than 17,000 mg/L.

   Reference: Hi Well Standards 2004 — Hawaii Well Construction Standards §1.4, Salt water well

8. 8Which Hawaii activity may proceed without a Commission well-construction permit under the minimum well standards?

   1. A. Constructing a production well
   2. B. Drilling a temporary test boring
   3. C. Modifying a monitor well
   4. D. Sealing a water well

   Answer: B

   Explanation: Section 2.1 exempts temporary test borings from the Commission well-construction permit while the listed water and monitor-well work requires one.

   Reference: Hi Well Standards 2004 — Hawaii Well Construction Standards §2.1

9. 9Which aquifer type is maintained above mean sea level at a height not explained solely by freshwater-saltwater buoyancy, often because of volcanic dikes or poorly permeable formations?

   1. A. Basal aquifer
   2. B. Perched aquifer
   3. C. Unconfined caprock lens
   4. D. High-level aquifer

   Answer: D

   Explanation: The standards define a high-level aquifer by that elevated occurrence and note the role of dikes or other poorly permeable formations.

   Reference: Hi Well Standards 2004 — Hawaii Well Construction Standards §1.4, High-level aquifer

10. 10How should a new water well be sited relative to wastewater lines, cesspools, septic tanks, and similar pollution sources?

    1. A. At the average setback used by nearby wells
    2. B. At the maximum distance possible
    3. C. At the shortest distance that permits equipment access
    4. D. At the same elevation as the nearest source

    Answer: B

    Explanation: Section 2.3(a) directs that new wells be sited the maximum distance possible from sources of pollution.

    Reference: Hi Well Standards 2004 — Hawaii Well Construction Standards §2.3(a)