Alabama (AL) Sewer Projects Contractor Practice Exam (100 Questions) LATEST QUESTIONS AND CORRECT ANSWERS GRADE A

Alabama (AL) Sewer Projects Contractor Practice Exam (100 Questions)
LATEST QUESTIONS AND CORRECT ANSWERS GRADE A


1. According to Alabama Department of Environmental Management (ADEM) regulations,
what is the minimum required separation distance between a septic tank and a water well?

A) 25 feet

B) 50 feet

C) 75 feet

D) 100 feet

**ANSWER: B**

**EXPLANATION:** ADEM Administrative Code Chapter 335-6-6 requires a minimum 50-
foot separation between septic tanks and water wells.



2. What is the minimum required slope for a 4-inch sewer main in Alabama?

A) 0.40% (1/4 inch per foot)

B) 0.50% (5/8 inch per 10 feet)

C) 0.60% (3/4 inch per 10 feet)

D) 1.00% (1 inch per 10 feet)

**ANSWER: A**

**EXPLANATION:** Alabama Plumbing Code and ADEM standards require a minimum
slope of 0.40% (1/4 inch per foot) for 4-inch sewer mains.



3. According to ADEM regulations, what is the minimum required liquid depth in a septic
tank?

A) 24 inches

B) 30 inches

C) 36 inches

,D) 42 inches

**ANSWER: C**

**EXPLANATION:** ADEM Administrative Code Chapter 335-6-6 requires a minimum liquid
depth of 36 inches in septic tanks.



4. What type of pipe is prohibited for use in sewer force mains in Alabama?

A) PVC Schedule 40

B) Ductile Iron

C) HDPE

D) Clay tile

**ANSWER: D**

**EXPLANATION:** Clay tile pipe is prohibited for force mains due to its inability to
withstand pressure; pressure-rated pipe like PVC, DI, or HDPE is required.



5. According to Alabama regulations, what is the minimum required cover over a sewer
main in a roadway?

A) 18 inches

B) 24 inches

C) 30 inches

D) 36 inches

**ANSWER: C**

**EXPLANATION:** Alabama Department of Transportation and local standards require
minimum 30 inches of cover over sewer mains in roadways.



6. What is the maximum allowable deflection for PVC sewer pipe after installation?

A) 2.5%

B) 5.0%

,C) 7.5%

D) 10.0%

**ANSWER: B**

**EXPLANATION:** ASTM D3034 and Alabama standards limit maximum deflection to 5%
for PVC sewer pipe.



7. According to ADEM, what is the minimum required size for a residential septic tank?

A) 750 gallons

B) 900 gallons

C) 1,000 gallons

D) 1,250 gallons

**ANSWER: C**

**EXPLANATION:** ADEM Administrative Code Chapter 335-6-6 requires a minimum
1,000-gallon septic tank for residential use.



8. What is the required minimum distance between sewer lines and water lines when laid
parallel?

A) 3 feet horizontal

B) 5 feet horizontal

C) 10 feet horizontal

D) 18 inches vertical

**ANSWER: C**

**EXPLANATION:** Alabama Plumbing Code Section 306.3 requires 10 feet horizontal
separation between sewer and water lines.



9. According to Alabama regulations, what is the minimum required air test pressure for
sewer lines?

, A) 2 psi for 15 minutes

B) 3.5 psi for 15 minutes

C) 5 psi for 15 minutes

D) 10 psi for 15 minutes

**ANSWER: B**

**EXPLANATION:** Alabama Plumbing Code requires sewer lines to hold 3.5 psi air
pressure for 15 minutes with no more than 1 psi drop.



10. What is the minimum required clearance between a sewer line and a building
foundation?

A) 2 feet

B) 3 feet

C) 5 feet

D) 10 feet

**ANSWER: C**

**EXPLANATION:** Alabama Building Code requires minimum 5-foot clearance between
sewer lines and building foundations.



11. According to ADEM, what is the minimum required size for a grease interceptor serving
a commercial kitchen?

A) 500 gallons

B) 750 gallons

C) 1,000 gallons

D) Based on fixture units

**ANSWER: D**

**EXPLANATION:** ADEM regulations require grease interceptors to be sized based on
fixture units and flow rates per Alabama Plumbing Code.