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1. An orchard worker sues his employer for not providing protective measures against exposure to DDT used in the orchard. a. Calculate the chronic daily intake of DDT for an adult from exposure at a level of 9 ppb for 40 hours a week over 30 years. b. Calculate the cancer risk sustained by the worker using the slope factor from Davis and Masten.
2. The SO2 emission from a fixed source is 25 g/s. The effective stack height is 60 m, the wind speed is 4 m/s at the top of the stack. Assuming class C stability, what is the expected ground level concentration 2 km downwind?
3. A sanitary landfill is being designed to handle solid waste at a rate of 75 Mg per day. It is expected that the waste will be delivered 5 days a week. The density as spread is 135 kg per m3. It will be spread in 0.5 m layers and compacted to 0.25 m. Assuming two lifts a day and a daily cover of 0.10 meters, determine the annual volume of landfill consumed in cubic meters and the daily horizontal area covered by the solid waste. Ignore the soil volume between stacks.
4. Ferric chloride (FeCl3·7H2O) is used at a water treatment plant. The FeCl3·7H2O is dosed at 40 mg/L. The flow rate of the treatment plant is 2,000 m3/d. a. Calculate the mass of sodium bicarbonate (NaHCO3) that would be required per day to replace the alkalinity consumed. (Hint: NaHCO3 dissociates to Na+ and HCO3 -) b. Calculate the total mass of sludge dry solids generated per day.
The following wind conditions are expected: V = 10 i - 5 j mph for 0 10 hr. Draw to scale the expected streakline of the stream for t = 3, 10, and 15 hr.
A pipe 1ft in diameter bends through an angle of 135 degrees. The velocity of flow of gasoline ( S = 0.8) is 20ft/s and the pressure is 10psig in the bend. What external force is required to hold the bend against the action of the gasoline
on a specific westbound section of highway studies show that the speed-density relationship is u= uf [1-(k/kf)^3.5] It is known that the capacity is 4200 veh/h and the jam density is 210 veh/mi.
a rectangular prism box which is floating on water has a length L =1200mm, breadth = 800mm, height = 500mm and mass of 52kg. when the box is loaded with the suspended hexagonal mass, its immersion is 300mm, and when it the mass is placed inside th..
how do the crack behaves under the compression of a concrete cubes under friction between the plates and specimen with stress strain diagram?
An equal tangent vertical curve is to be constructed between grades of -3.0% (initial) and 1.0% (final). The PVI is at station 110+00 and elevation 420 ft. Due to a street crossing the roadway, the elevation of the roadway at station 112+00 must b..
CPM Construction plans to buy a truck for $150,000 and sell it for $15,000 at the end of 5 years. The annual operating cost of the vehicle is $60,000. What is the present value of the truck
Compute the maximum service (unfactored) concentrated live load that can be applied at 1ft from the free end of the cantilever. Use load and strength -reduction factors from ACI Code Sections 9.2 and 9.3. Also check As,min.
Assuming that the velocity variation within the main channel and the floodplain subsections is much smaller than the change in mean velocities between subsections, find the value of the kinetic energy correction coefficient.
Wastewater flow is 80 gpcd with 170 mg/l BOD and 190 mg/l suspended solids. Size the extended aeration basin and clarifier using the minimum detention time and overflow rates. Calculate the average F/M using an MLSS of 1000 mg/l.
A soil sample with a volume of 0.5 m3, dry unit weight = 18.1 kN/m3, water content = 5%, and Specific Gravity of the soil solids = 2.68. Calculate weight of water added to reach 90% saturation (in kilograms)?
If the time required to pay for parking is exponentially distributed with a mean of 15 seconds, find the average time in system.
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