Answer Happy

7. Determine the volume of excavation for each of the storm sewer catch basins. Given 48" x 24" inside dimensions and 6" wall thickness, assume that the bottom of the trench is a 6.00 feet by 4.00 feet. Add 1.5 feet to the top of casting to invert distance to determine overall trench depth. Again, assume that the soil is tough clay (0.25% Horizontal to 1.0' Vertical). Catch Basin Number Top Area Volume Trench Depth Feet 2 Bottom Area Ft2 24 Ft2 Average Area Ft2 19.5 Yd3 1.44 CB 2 15 CB 3 2 24 15 19.5 1.44 CB 4 2 24 15 19.5 1.44 CB 5 2 24 15 19.5 1.44 8. Given the information from Item Seven, what is the installation time for the storm sewer catch basins? Catch Basin Number CB 2 Volume Yd Installation Time Hours 1.44 CB 3 1.44 CB 4 1.44 CB 5 1.44 9. Storm Manhole MH 1 is to be set on a 12” layer of #57 compacted stone (bulk density = 100 lbs/ft3). Given the dimensions of the bottom of the manhole trench in Item Five, how many tons of # 57 stone is required? 10. Catch Basins CB 2 through CB 5 are also to be set on a 12” layer of #57 compacted stone (bulk density = 100 lbs/ft3). Given the dimensions of the bottom of the manhole trench in Item Seven, how many tons of # 57 stone is required?