Silt fence is needed on three sides of a 220 ft by 140 ft disturbed pad; the remaining 220 ft side is protected by a stabilized construction entrance. Adding 5 percent for overlaps and returns, what fence length should be ordered?
Correct Answer
C) 525 ft
The three protected sides total 220 + 140 + 140 = 500 ft. Adding 5 percent gives 500 x 1.05 = 525 ft. Other choices omit overlaps, fence all four sides incorrectly, or add a larger allowance.
Why This Is the Correct Answer
The three protected sides total 220 + 140 + 140 = 500 ft. Adding 5 percent gives 500 x 1.05 = 525 ft. Other choices omit overlaps, fence all four sides incorrectly, or add a larger allowance.
Why the Other Options Are Wrong
Option A: 500 ft
sediment control length, choice a: 500 ft is an intermediate from the steps (.
Option B: 550 ft
sediment control length, choice c: 550 ft implies about 10 percent added to 500; the stated add-on is 5 percent in.
Option D: 560 ft
sediment control length, choice d: 560 ft implies about 12 percent added to 500; the stated add-on is 5 percent in.
Memory Technique
Keep a redline beside sediment control length: if one number is skipped, the option drifts away from 525 ft.
Reference Hint
Open Developing Your Stormwater Pollution Prevention Plan, EPA 833-R-06-004, 2007; use the index entry or section for "Perimeter sediment control quantity takeoff" to confirm that The three protected sides total 220 + 140 + 140 = 500 ft.
More NASCLA Questions
Bid instructions require bid security with each sealed bid. Which purpose should the estimator associate with that requirement?
A wood deck surface has 320 sf of coverage. Boards have a 5-1/2 in. actual face width, and the order includes an 8 percent cutting allowance. What linear footage is closest?
Using the dimensions shown for the stabilized construction entrance, what is the plan area?
A reroof area requires 14,720 sf of rigid insulation. Boards are 4 ft by 8 ft, and the order includes 5 percent waste. How many boards are needed?
Two addenda revise the drawings before bid day. What must a responsive bidder normally do with those addenda?
A utility trench is 180 ft long, 3 ft wide, and 7 ft deep with vertical sides inside a trench shield. What excavation volume is required?
A 120 ft long Type C trench is cut with a 4 ft bottom width and a 6 ft depth. If side slopes are 1-1/2 horizontal to 1 vertical, what excavation volume is closest?
A storm pipe run needs 240 ft of bedding, 4 ft wide and 6 in. thick. Including a 10 percent ordering allowance, how many cubic yards of bedding aggregate are needed?
A mass excavation produces 1,180 loose cubic yards of material for off-site disposal. End-dump trucks can haul 18 loose cubic yards per trip. What truck count is required?
An asphalt-shingle roof has a slope of 3:12. Under the IBC low-slope asphalt-shingle provisions, what underlayment arrangement is required?
People Also Study
Business & Financial Management
120 questions · 70% to pass
Contract Administration
60 questions · 70% to pass
Project Management
60 questions · 70% to pass