Backfill is placed against a retaining wall before drainage rock and filter fabric are complete. What is the risk?
Correct Answer
B) Drainage failure.
Improper backfill and drainage preparation can trap water and create settlement or wall pressure problems.
Why This Is the Correct Answer
Improper backfill and drainage preparation can trap water and create settlement or wall pressure problems.
Why the Other Options Are Wrong
Option A: Inspection view.
Inspection view. addresses a neighboring field issue, but not the condition or method control required for backfill material quality.
Option C: Lint catching.
Lint catching. addresses a neighboring field issue, but not the condition or method control required for backfill material quality.
Option D: Listed firestop.
Listed firestop. addresses a neighboring field issue, but not the condition or method control required for backfill material quality.
Memory Technique
Improper is the clue; preparation is the method check for Observing Site.
Reference Hint
Study anchor (closed-book): memorize Backfill material quality from California Building Code, California Code of Regulations Title 24. / Title 24 California Building Code backfill and site drainage concepts; know the rule or calculation trigger without relying on exam-room lookup.
More Class B Trade Questions
A 2-inch horizontal sanitary branch must be installed at 1/4 inch fall per foot. What total fall is needed over a 24-foot run?
A 4-inch building drain is laid out with a required 1/8 inch fall per foot. What fall is required across 40 feet?
A rooftop unit schedule shows 3 tons of cooling. Using 12,000 Btu per hour per ton, what cooling capacity is this?
A pump motor is listed as 2 horsepower, and the coordination table asks for watts. Using 746 watts per horsepower, what is the approximate motor power?
A slab is 30 feet long, 18 feet wide, and 4 inches thick. How many cubic yards of concrete are needed before waste?
A footing is 80 feet long, 2 feet wide, and 12 inches deep. How many cubic yards of concrete are required before waste?
A patio subgrade must drain at 2 percent away from the building for 20 feet. What total drop is required?
A building pad needs 150 compacted cubic yards of fill. If the borrow material shrinks 10 percent after compaction, about how many loose cubic yards should be hauled in?
A roofing estimate shows 2,850 square feet of roof area. How many roofing squares is that?
A waterproof deck surface is 14 feet deep and must slope 1/4 inch per foot to the drain. What vertical fall is needed?