Contractor Exam Questions And

CA D59 Hydroseed Spraying Contractor Exam Questions And Correct Answers (Verified Answers) Plus Rationale2026 Q&A| Instant Download Pdf

• What is the primary purpose of hydroseeding?
• To improve soil chemistry
• To prevent soil erosion
• To remove existing vegetation
• To compact loose soil

Answer: b

Rationale: Hydroseeding establishes vegetation quickly, which stabilizes

disturbed soil and prevents erosion.

• Which component of hydroseed slurry acts as the binding agent that

holds seed to soil?

• Fertilizer
• Tackifier
• Mulch
• Soil amendment

Answer: b

Rationale: Tackifiers create adhesion between soil and seed, reducing

washout on slopes.

• / 3

• Hydroseeding is most commonly applied using which equipment?
• Backhoe
• Mixing tank with pump
• Trencher
• Compactor

Answer: b

Rationale: Hydroseeding requires a mechanical tank to mix slurry and

spray it under pressure.

4. The typical seed-to-mulch ratio in hydroseeding is designed to:

• Increase soil compaction
• Improve moisture retention
• Reduce fertilizer needs
• Increase soil pH

Answer: b

Rationale: Mulch maintains moisture around the seed, improving

germination.

• What is the primary safety hazard when operating a hydroseeding

tank with an agitator?

• Electrical shock
• Entanglement
• Sun exposure
• Noise

Answer: b

Rationale: Rotating agitators can trap clothing or limbs if workers reach

inside the tank.

• When hydroseeding on steep slopes, which additive is most used to

reduce erosion? 2 / 3

• Lime
• Tackifier
• Herbicide
• Gypsum

Answer: b

Rationale: Tackifiers help slurry adhere to steep surfaces and resist runoff.

7. Seed calibration ensures:

• Correct temperature
• Correct seed application rate
• Correct water pH
• Correct tank pressure

Answer: b

Rationale: Calibration prevents under- or over-applying seed, ensuring

uniform coverage.

• Which type of mulch is most common in hydroseeding?
• Rubber mulch
• Wood fiber mulch
• Leaf mulch
• Pine bark chips

Answer: b

Rationale: Wood fiber mulch dissolves well and provides moisture retention

for seeds.

9. Hydroseeding should not be performed when winds exceed:

• 5 mph
• 10 mph
• 20 mph
• 30 mph
• / 3