A homeowner wants to finish a basement and install a bathroom. The basement floor is 7 feet below the main sewer line. What type of system is required according to Michigan plumbing standards?
Correct Answer
B) Sewage ejector pump system
When fixtures are below the main sewer line, Michigan plumbing code requires a sewage ejector pump system for proper drainage.
Why This Is the Correct Answer
A sewage ejector pump system is required when plumbing fixtures are located below the elevation of the main sewer line. The pump collects waste in a sealed basin and forces it upward under pressure to reach the gravity sewer. Michigan plumbing code mandates this system to prevent backflow and ensure proper sanitary drainage.
Why the Other Options Are Wrong
Option A: Grinder pump system
A grinder pump system is a specific type of pressure sewer system used to pump sewage from a property to a municipal main, typically for entire homes in low-lying areas. It grinds solids and pumps effluent long distances, but it is not the standard code-required solution for a single below-grade bathroom fixture group in Michigan residential construction.
Option C: Gravity drainage system
A gravity drainage system relies solely on slope (typically 1/4 inch per foot) to move waste to the sewer. When fixtures are 7 feet below the main sewer line, gravity flow is physically impossible — waste cannot travel uphill without mechanical assistance.
Option D: Septic system connection
A septic system connection is used for properties not served by public sewer, and handles all household waste. It is not a solution for routing below-grade fixtures to an existing sewer connection, and installing a new septic system in this context would be unnecessary, impractical, and code-noncompliant.
Memory Technique
Think 'EJECT what's below.' When fixtures are below the sewer, you need to EJECT the waste upward — Sewage Ejector Pump. Picture an elevator pushing waste up from a basement pit to reach the sewer level.
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You are framing a residential structure in Michigan with 2x10 floor joists spanning 14 feet. The joists are spaced 16 inches on center and will support a live load of 40 psf. What is the maximum allowable deflection under live load?
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During a plumbing rough-in inspection, you observe that a water supply line runs through a floor joist. According to Michigan plumbing requirements, what is the maximum diameter hole that can be bored through the center third of a 2x10 joist?