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MOSS SCHOOL OF CONSTRUCTION
BCN 3611 – CONST. COST ESTIMATING I
SUMMER A 2019
32′-0″
26ʹ-1ʺ
3′-0″
3ʹ-2ʺ
Homework Assignment #3 (Due on: 05/28/2019 @11:59PM)
BASEMENT AREA
90′-0″
60ʹ-0ʺ
3′-0″
3ʹ-0ʺ
32ʹ-4ʺ
40′-0″
8ʺ S.O.G
(30ʹ×15ʹ)
100ʹ-0ʺ
Building
Plan
110′-0″
 PART 1
1. Use the grid averaging (cross-section) method to estimate the quantity of cut and/or fill required for a
50ʹ × 50ʹ grid with the following existing elevations at its four corners: 90.33ʹ, 98.67ʹ, 92.33ʹ, and 95.25ʹ.
Assume the proposed rough grade is 96.00ʹ for all four corners. (hint: the 96ʹ contour line divides the
cell into two sections with equal areas)
2. Estimate (in loose cubic yards) the quantity of topsoil that need to be removed and stockpiled for the
above building plan. Assume 10ʺ of topsoil that need to be removed for an area extending 4ʹ beyond
the building footprint in each direction. The swell factor is 12 percent.
3. Estimate (in bank cubic yards) the volume of soil to be removed for the mass excavation of the basement
area only of the above building plan. The foundation wall thickness is 1ʹ and the bottom of the
continuous footing is 9ʹ below the rough grade level. Assume 1ʹ of working space on each side and an
excavation slope of 1:1.
Homework Assignment #3
05/21/2019
Page 1| 2
MOSS SCHOOL OF CONSTRUCTION
BCN 3611 – CONST. COST ESTIMATING I
SUMMER A 2019
 PART 2
1. Estimate the formwork (in SFCA) needed for the footings and foundation walls in the basement area
only of the shown building plan. The footings are 1ʹ deep and the foundation walls are 9ʹ high.
2. Estimate the amount of concrete needed for the footings and foundation walls in the basement area only
of the shown building plan.
3. If the 8ʺ thick slab-on-grade (S.O.G.) at the south side of the building has steel reinforcement of #4 bars
@15ʺ O.C. E.W., estimate the total length (in feet) and weight (in pounds) of this reinforcement
(assume 12% for lap and waste – #4 bars weigh 0.668 lb/ft).
4. If the reinforcement in question 3 was substituted with a welded wire mesh, how many 120 SF sheets
are needed to reinforce this S.O.G. (assume 10% for lap and waste)?
Homework Assignment #3
05/21/2019
Page 2| 2

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